s
Vacuum Circuit-Breaker 3AH3 12 and 15 kV/31.5 and 40 kA 24 kV / 25 kA and 36 kV/31.5 kA Operating Instructions Manual
23
Contents
Page
General ............................................................................................................................................................... 1 Technical data .................................................................................................................................................... 2 Type designation ....................................................................................................................................... 2 Rating plate ............................................................................................................................................... 2 Standards and specifications .................................................................................................................... 2 Ambient temperature/humidity temperature/humidity and current current loading ......................... .............................. ........................... 2 Site altitude ............................................................................................................................................... 3 Electrical data ........................ ............................ ............................ ............................ ......................... ....... 3 Operating times ........................................................................................................................................ 4 Switching Switching duties ........................... ............................ ............................ ........................... .......................... 4 Motor operating mechanism ..................................................................................................................... 4 Auxiliary switch ......................................................................................................................................... 4 Socket for low-voltage plug connector ...................................................................................................... 5 Shunt closing release ................................................................................................................................ 5 Shunt releases .......................................................................................................................................... 5 Undervoltage release ................................................................................................................................ 5 CT-Operated release .......................... ............................ ............................ ........................... ..................... 5 Breaker tripping signal, cut-out switches (S6 and S7) ............................................................................... 5 Varistor module ......................................................................................................................................... 5 Electrical local closing/Electrical interlock ............................ ............................. ............................. ............ 6 Mechanical interlock ......................... .......................... .......................... .......................... ........................... 6 Dimensions and weights ............................ ............................ ............................ ........................... ............ 6 Description ........................................................................................................................................................ 7 Construction .............................................................................................................................................. 7 Vacuum interrupters interrupters ......................... ............................ ............................. .......................... ..................... 10 Complement .......................... ............................. ............................. ............................ ......................... ... 10 Installation .......................... .......................... ........................... ........................... ............................ ................. 11 Installing in cubicle cubicle or on truck truck ............................... ............................ ........................... ........................... 11 Flat bar connection ....................... .......................... .......................... .......................... .............................. 11 Control leads ............................................................................................................................................12 Earthing ......................... ............................ ............................ ........................... ........................... ............. 12 Circuit documents ....................................................................................................................................12 Function schematic diagram........................... diagram ........................... ........................... ........................... .............................. . 13/14 13/14 Operation .......................................................................................................................................................15 Commissioning.........................................................................................................................................15 Charging the closing spring ......................................................................................................................16 Closing .....................................................................................................................................................16 Tripping ....................... ........................... ........................... ........................... ........................ ..................... 16 Disposal of the product ............................ ............................. ............................ .......................... ............. 16 Maintenance ........................... ........................... .......................... ........................... ......................... ................. 17 Safety measures ............................ ............................ ........................... ............................ ....................... 17 Servicing ............................ ............................ ............................ ........................... ............................ ........ 17 Checking the contact systems .................................................................................................................19 Checking the vacuum ........................... ............................ ............................ ........................... ................. 19 Accessories and spare parts ................................................................................................................... 20 List of spares .......................................................................................................................................... 20 Central legend ......................................................................................................................................... 21 Troubleshooting ....................................................................................................................................... 22
Subject to change due to improved improved design. Notes:
1. The items numbers shown shown in the Figures are explained explained in the central legend (refer page 23). 2. When ordering the Operating Instructions Manual, Manu al, please quote the Order No. 4P-0502-03-98120-001 4P-0502-03-98120-001..
24
Attention
Warning This equipment contains hazardous voltages and mechanical parts which move at high speed and may be controlled remotely. Non-observance of the safety instructions can result in severe personal injury or property damage. Only qualified personnel should work on o r around this equipment after becoming thoroughly familiar with all warnings, safety notices and maintenance procedures contained herein.
In their basic design and with all standard listed equipment options, 3AH3 vacuum circuit breakers breakers are type tested components in accordance with relevant IEC/IS. If any attachments or installations, e.g. interlocking components in connection with switchgear, are made to the breakers at a later stage, it must be ensured that fast moving parts are not loaded additionally by masses or forces and that any added parts have an adequate clearance particularly from moving and live parts. If you intend to fit the breakers with additional functions, we recommend that you should first consult us as in most cases proven and tested solutions are already available.
The successful and safe operation of this equipment is dependent on proper handling, installation, operation and maintenance.
General: Siemens 3AH3 vacuum circuit-breakers (VCBs) are of triple-pole indoor type for rated voltages between 12 and 36 kV.
The mounting position (relative to the vacuum interrupters) interrupters) is vertical.The vacuum circuit-breakers can be used in practically any system system design.
The vacuum circuit-breaker consists of the mechanism housing complete with stored-energy mechanism and control elements, the three poles with vacuum interrupters, interrupters, six cast resin insulators and three switching bars.
Under normal operating conditions, the vacuum circuitbreaker is maintenance free.
1
Technical data
Ambient temperature/humidity temperature/humidity and current loading
Type designation
3AH3 vacuum circuit-breakers are identified by a machine-readable product designation made up of a series of figures and letters. letters.
Rated voltage code, design code Rated short circuit breaking current code Rated normal current code
A
H
3
1
1
5
-
2
Rating plate
The rating plate contains the following following information: 1
Manuf Manufact acture urerr
8
Weigh eightt
2
Type designatio designation n
9
Rated operating operating sequence sequence
3
Serial Serial number number
10 Rated frequency
4
Desi Design gn code code
5
Year of manufact manufacture ure
11 Rated lightning impulse withstand voltage
6
Rated normal normal current current
12 Rated short-circuit breaking current
7
Rated Rated short-circ short-circuit uit duration
13 Rated voltage voltage
1
o
Average Average over over a period of 24 hours = +35 C
Type
2
Design Code
4
Sr. No.
3
Year of Manuf.
5
Un
13
kV
Isc
12
Up
11
= –5 C
Permissible atmospheric humidity: Relativ Relative e humidi humidity ty,, 24 hour mean
= max. 95%
Relative Relative humidity humidity,, 1 month mean
= max. 90%
Under these conditions condensation may occasionally occur. The rated normal currents listed in Fig. 1/4 were laid down for 40oC ambient in accordance with IS/IEC. Use under conditions other than normal is possible with certain measures that can be implemented on request. The maximum permissible load current as a function of the breaker ambient temperature temperature has been plotted in Fig. 1/2. The load currents indicated apply to opentype switchgear. Metal-enclosed switchgear must be derated as specified by the switchgear manufacturer. Determination of the load characteristics characteristics number Rated normal current
Load characteristics characteristics number
1250 A
1
1600 A
2
2000 A
3
2500 A
4
3150 A
5
s
o
Minimum value
Basic type
3
The 3AH3 VCBs are designed for the normal operating conditions laid down in the standards. Permissible ambient temperatures: temperatures: o Maximum value = +40 C
4600 A 4200
3800
50 Hz 10
Ir
6
A
kA
tk
7
S
kV
m
8
kg
3400
5
3000
9
Rated operating duty 0-0.3s-CO-3min-CO
MADE IN INDIA
t
4 n e
2600 r u
3
70 0107746 001 u C d
2200 a o L
Fig. 1/1 Rating plate Note : In the event of any queries, state the type designation (2), design code (4) and the serial number (3).
2
1
1400
1000
Standard specifications
The 3AH3 vacuum circuit-breakers comply with the provisions of IS 13118, IEC 60056, 60 056, IEC 60694. The VCBs rated for 15 kV meet the requirements of the American standards ANSI C37 with respect to their insulating capacity. capacity.
2
1800
600 20
30
40
50
60
O
C
Ambient temp
Fig. 1/2
Maximum permissible load current as a function of the ambient temperature temperature
Site altitude
Correctio Correction n factor factor a ............... ....................... ............... ............... ............... .......... ... 0,73 (according to Fig. 1/3)
The rated insulating capacity values (rated impulse withstand voltage, rated power frequency withstand voltage)1) specified for the equipment are, in accordance with the provisions of IEC Publication 71, based on standard atmospheric conditions (1013 h Pa, 20oC and 1 1 g/m3 water content). i.e. sea level. The insulating capacity of an insulation in air decreases with increasing altitude as a result of decrease in the air density. Standards promulgated by VDE, IEC and other disregard this decrease in insulating capacity for altitude of up to 1000m, i.e. the decrease of approximately 9% at this altitude is still permissible.
Rated impulse withstand voltage to be selected
≥
1.1 x 0.73
≥
118 kV
Switchgear with rated voltage of 24 kV, IEC List 2 (rated lightning impulse withstand voltage of 125 kV) meets this requirement. The actual insulating capacity at the site is then withstand voltage 3) = a • rated withstand voltage2) of the selected switchgear unit. unit. 1.0
The standards provide no guideline for altitudes of more than 1000 m with respect to insulation ratings; they leave this up to an a n agreement between manufacturer and user. user.
0.9 ' a0.8 ' r o t 0.7 c a F0.6
Our own recommendation is as follows: Since this method used for insulation rating up to altitudes of 1000 m has proved to be satisfactory, it should also be applied to higher altitudes.The altitude correction factor “a” should therefore therefore be based on the insulating capacity at 1000 m, which is lower by 9% (corresponding to 0.91 or 1/1. 1/1.1) than the capacity capacit y at sea se a level.
n o i t 0.5 c e0.1 r r o C
The following expression thus applies for the selection of the equipment: Rated withstand voltage to be selected2)
10 0 0
2000
30 0 0
400 0
50 00 m
Altitude of site above sea level
Fig. 1/3
Required withstand voltage 2)
> =
95 kV
Relation Relationship ship between between the the corre correction ction factor factor “a” and the site altitude
The following definitions apply: ) Rate Rated d with withsta stand nd volta voltage ge2) = required value corresponding to the provisions of IS, IEC etc. for sea level. Withstand voltage3) = actual value for the given altitude 2 ) Rated Rated ligh lightni tning ng impul impulse se withs withstand tand volta voltage ge Rated power frequency frequency withstand voltage 3 ) Lightn Lightning ing impuls impulse e with withsta stand nd volta voltage ge Power frequency withstand voltage
1.1 x a
1
Example:
Site altitude altitude above sea level level ............................. 3000 m Required impulse withstand voltage ................... 95 kV (for a 15 kV system according to ANSI) Electrical data : 3AH3 vacuum circuit-breaker circuit-breaker 1 kV
2 kV
3 kV
4 kA
5 s
1250A
1600A
6 2000A
2500A
3150A
31.5
3
12
75
28
40
3
31.5
3
15
95
36
40
3
24
125
50
25
3
36
170
70
31.5
3
Remark : available 1 2 3 4 5 6
Rated voltage voltage (maximum (maximum permissible permissible system voltage) voltage) at 50 to 60 Hz Rated lightning lightning impulse impulse withstand voltage (peak (peak voltage) voltage) Rated power power frequency frequency withstand voltage (RMS (RMS value for for 1 min.) Rated Rated short circu circuit it current current Rated Rated short circu circuit it duratio duration n Rated Rated normal normal current current
7 kA 80 80 80 100 100 100 100 100 80 80 80 100 100 100 100 100 63 63 80 80 80
8 % 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 27 27 27
9 mm 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 275 275 300 300 300
10 EK EK EK EU EU EU EU EU EK EK EK EK EU EU EK EU EK EK EK EK EK
11 MLFB 3AH3 115-2 3AH3 115-4 3AH3 115-6 3AH3 116-2 3AH3 116-3 3AH3 116-4 3AH3 116-6 3AH3 116-7 3AH3 165-2 3AH3 165-4 3AH3 165-6 3AH3 166-2 3AH3 166-3 3AH3 166-4 3AH3 166-6 3AH3 166-7 3AH3 284-2 3AH3 284-4 3AH3 315-2 3AH3 315-4 3AH3 315-6
7 8 9 10
Rated Rated short short circuit circuit makin making g current current DC component component of rated short short - circuit circuit breaking breaking current current Pole cent centre re dist distanc ance e Switc Switchin hing g duti duties es U = Rapi Rapid d load load transf transfer er K = Rapid auto-reclosure + U E = Electrical operating energy 11 Type designati designation on
Fig. 1/4 Electrical Electrical data of 3AH3 3AH3 vacuum vacuum circuit-b circuit-break reakers ers 3
Operating times
Closing time ........................... ............................ ............................ ............................ ....................... ms < 80 Spring charging time ......................... ............................ ............................ ............................. .............. s < 15 Opening time ......................... with first shunt release release 3AY1 3AY15 5 10 (Y1) (Y1) ............................... ............... ms < 65 — do — ............................... . with supplementary (second) shunt release 3AY1 3AY15 5 10 10 (Y3) .............. ms < 65 65 — do — ............................. ... with supplementary shunt release 3AX11 3AX11 (Y2/Y4/Y7) ...................... ms < 45 Arcing time ........................ ........................... .......................... ........................... .............................. .. ms < 15 Break time ............................ .. with first shunt release release 3AY1 3AY15 5 10 10 (Y1) (Y1) ........................... ................... ms < 80 Break time ............................ .. with second shunt release release 3AY1 3AY15 5 10 10 (Y3)................................... (Y3).... ............................... ...... ms < 80 — do — ............................. ... with supplementary shunt release 3AX11 3AX11 (Y2/Y4/Y7) ...................... ms < 60 Dead time....................... time ....................... ........................... ........................... ........................... .............................. .... ms 300 Close-open-time ..................... with shunt release 3AY1 3AY15 5 10 (Y1) .............................. ....................... ms < 90 Close-open-time ..................... with supplementary supplementary (second) shunt release 3AY1 3AY15 5 10 10 (Y3) .............. ms < 90 Close-open-t Close-open-time ime ............... ..................... ...... with supplementary supplementary shunt release 3AX11 3AX11 (Y2/Y4/Y7 (Y2/Y4/Y7)) .............. ..................... ......... ms < 70 Minimum pulse duration ...... “Close” Close” .......................... with ...... “Open” Open” ........................... with ...... “Open” Open” ........................... with ...... “Open” Open” ........................... with
closing release 3AY1 3AY15 5 10 10 (Y9) (Y9) ........................... ......................... ms < 45 first first shunt release 3A 3AY15 10 (Y1) .............................. ................. ms < 40 second shunt release 3AY1 3AY15 5 10 10 (Y3)............................... (Y3) ............................... .......... ms < 40 40 supplementary shunt release 3AX11 3AX11 (Y2/Y4/Y7) (Y2/Y4/Y7) ...................... ms < 20
Shortest pulse duration duration of breaker breaker tripping tripping signal for for first first shunt release ............................... ........... ms > 15 15 Shortest pulse duration of breaker breaker tripping signal for for second shunt release release ............................ ......... ms > 15 15 Shortest pulse duration duration of breaker breaker tripping tripping signal for for third third shunt release ............................ ............. ms > 10 10 Fig. 1/5 Operating times Closing time = the interval of time between the initiation of the closing operation and the instant when the contacts touch in all poles. Opening time = the interval of time between the initiation of the opening operation and the instant when the contacts separate in all poles. Arcing time = the interval of time between the instant of the first initiation of an arc and the instant of final arc extinction in all poles. Break time = the interval of time between the beginning of the opening o pening time of a circuit-breaker circuit-breaker and the end of the arcing time. Dead time = time from the end of the current flow in all poles up to the beginning of the current flow in the first pole Close-open time = the interval of time (in a makebreak operating cycle) between the instant when the contacts touch in the first pole in the closing process, and the instant when the arcing contacts separate in all poles in the subsequent opening process. Switching duties
The operating mechanisms of the 3AH3 circuitbreakers are suitable for rapid auto-reclosure. Breakers for a rated short-circuit breaking current of 40 kA are, at rated data levels, suitable for rapid load transfer and till 31.5 kA for rapid auto-reclosure.
4
Motor operating mechanism (M1)
The maximum DC power input is 770 W (approx.). The maximum AC power input is 900 VA (approx.). During part of the short spring charging time the motors operate in the overload range. The recommended ratings for motor protection devices are shown in Fig. 1/6 (the protection devices devices are not supplied with the vacuum breakers and must be ordered separately). Rated su supply vo voltage Recommended rating of protection device*)
DC 24 24 V DC 48 48 V DC 60 60 V
16 A
8A
6A
DC/AC 110 V 50/60 Hz
DC 220 V/ AC 230 V 50/60 Hz
5A1)
2.5 A1)
*) MCB with G characteristic. 1) Also lower values are applicable : 3A/1.6A
Fig. 1/6
Rated Rated current currents s of motor protection protection devices devices
The supply voltage may deviate from the rated value by - 15% to + 10%. Auxiliary switch (S1) 3SV92
Two versions of the auxiliary switch can be supplied. The standard version is fitted with 6 NO contacts and 6 NC contacts. The extended version is fitted with 12 NO contacts and 12 NC contacts. Rated voltage : AC/DC 250 V Insulation class : C Current : 10 A Making capacity : 50 A
Breaking capacity AC 40 upto 60 Hz Supply Voltage U (V)
up to 230
Operational current I (A)
DC Supply Voltage U (V)
Operational current I (A) Resistive load
Inductive load (T=20 ms)
24
10
10
48
10
9
60
9
7
110
5
4
220
2.5
2
10
Fig. 1/7 Breaking capacity of 3SV92 aux. switch Socket for low-voltage low-voltage plug connector (X0)
The control elements of the 3AH3 vacuum circuitbreaker provided provided in the mechanism housing are wired for external connection to the socket (X0). The breaker is provided with either 32-pins or 64-pins. Closing release (Y9) 3AY1510
The closing solenoid unlatches the charged closing spring and thus closes the circuit-breaker electrically. electrically. It is available for both AC and DC operation. After completion of a closing operation, the closing solenoid is de-energized internally. In operation with AC voltage, a rectifier module 3AX1525 3AX1525 is installed in the circuitbreaker. Power Power consumption consu mption 200 W/VA Shunt releases (shunt opening releases)
The shunt releases are used for automatic automatic tripping of circuit-breakers circuit-breakers by means of appropriate protective relays and for deliberate tripping by other electrical means. They are designed for connection to external voltage (DC or AC voltage). In special cases, for deliberate tripping, they can also be connected to a voltage transformer. Shunt releases based on two different operating principles are used. Basic 1st Shunt release (Y1) 3AY1510
The 3AY1510 shunt release is used as standard in the basic circuit-breaker version. version. With this design, the electrically supplied tripping pulse is passed to the “Open” Open” latching mechanism by means of a directaction solenoid armature and the circuit-breaker circuit-breaker is thus opened. It is available for both AC and DC operation. After completion of a opening operation, the 3AY1510 shunt release is de-energized internally. In operation with AC voltage, a rectifier module 3AX1525 is installed in the circuit-breaker. Power Power consumption consu mption 200 W/VA Supplementary 2nd Shunt release (Y3) 3AY15 10*)
This release is used if more than one shunt release is required to ensure opening of the breaker in case of failure of first shunt release. The voltage of this release hence can be same or different different than first shunt
release. This release is dimensionally & functionally same as first shunt release. Power consumption 200W/VA Supplementary 2nd Shunt release (Y2) 3AX1101*)
The 3AX1101 shunt release is fitted if more than one shunt release is required. With its design, the electrical opening command is transfered transfered in boosted form to the “Open” Open” latching mechanism via a solenoid armature through unlatching unlatching of a energy store and thus, the circuit-breaker circuit-breaker is opened. The stored energy mechanism is automatically recharged by the circuitbreaker. Power consumption ≤ 60 W or ≤ 55 VA Supplementary Under voltage release (Y7) 3AX1103*)
Undervoltage release consist of a stored-energy mechanism, an unlatching mechanism and an electromagnet system which is connected continuously to the supply when the circuit-breaker is in the close state. If this voltage drops to below certain value, the unlatching mechanism is released and opening of the circuit-breaker is thus initiated via the stored-energy mechanism. The stored energy mechanism is automatically recharged by the circuitbreaker. The deliberate tripping of the undervoltage release generally takes place via an NC contact in the tripping circuit. But it can also be carried out via an NO contact by short-circuiting of the magnet coil. With this type of tripping, the short-circuit current is limited by the builtin resistors. Undervoltage release can also be connected to voltage transformers. When the operating voltage drops to impermissible low levels, the circuit-breaker is tripped automatically. Power consumption ≤ 6.5 W or ≤ 7.5 VA CT-Opera CT-Operated ted release (Y4, Y5) 3AX1102*) 3AX1102*)
CT-operated releases consist of a stored-energy mechanism, an unlatching mechanism and an electromagnet system. When the tripping current is exceeded (90% of the CT-operated release rated current) the unlatching device of the stored-energy 5
Release combinations
Basic Equipment
Supplementary release (at additional cost)
Closing release 3AY15 10
1st Opening release 3AY15 10
2nd Opening release 3AY15 10
2nd Opening release 3AX1101
undervoltage release 3AX1103
C.T. operated release 3AX1102
Y9
Y1
Y3
Y2
Y7
Y4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
A 1
mechanism is released and thus opening of the circuit-breaker is initiated. The stored energy mechanism is automatically recharged by the circuitbreaker. breaker. In addition to the primary current transformers, matching transformers are required for application of the CT-operated releases. Power consumption for 0.5 A and 1 A ≤ 6 VA VA at a t 90% of the rated current and with open armature. CT-operated release (Y6) 3AX 1104*)
(Low-energy release 0.1 Ws) In connection with a solid-state release (7SJ41 overcurrent time protection or similar) and low-power primary current transformers (window-type transformers), it is possible with the 3AX1104 to create a CT-operated CT-operated release without additional supply voltage. The 3AX1104 is of similar design as the 3AX1101/1102 releases. With its coil data and its low energy requirement of ≤ 0.1 Ws, it is designed to be directly actuated by a release impulse provided by a capacitor of the above-mentioned electronic release systems. Breaker tripping signal, cut-out switches (S6 and S7)
When the vacuum circuit breaker is tripped by means of a release, the position switch S6 briefly makes contact. This contact making can be used for signalling. In the event of intentional mechanical tripping, the cutout switch S7 breaks this contact. Varistor module 3AX1526
The disconnection of inductive loads in DC circuits may cause switching overvoltages overvoltages which pose a risk to electronic control units. In order to prevent this, the inductances of the circuit-breaker mechanism mechanism and control (motor, (motor, closing solenoid, shunt release and auxiliary contactor) can be connected to Varistor Varistor (with *) Can be ordered on request, retrofitting possible.
6
MLFB No. at 9th position
E B 1
H 1
D F
1
G
1
C
DC operation). For rated operating voltages of 60 V to 250 V DC the varistor module 3AX 1526 is available as an accessory; it limits the overvoltages to about 500 V. The module contains 2 separate varistor circuits. Electrical local closing/electrical Interlocking
In the basic version, the closing spring must be released mechanically if the breaker is to be closed locally. locally. A version with electrical local closing can also be supplied. In this version, the the making circuit o f the circuit-breaker circuit-breaker is activated electrically via a pushbutton. In this way, allowance can also be made for station-specific interlocks, and undesired making operations prevented. For example, interlocking of the circuit-breaker circuit-breaker is possible via the auxiliary contact of a disconnector. Circuit-breakers Circuit-breakers with electrical local closing cannot be closed mechanically. Mechanical interlocking 3AX1520-2C
The sensing parts of the substation check the switch position of the circuit-breaker circuit-breaker and prevent it from closing mechanically and electrically if the associated disconnector is not in a position to allow safe operation. On the other hand, the disconnector is prevented prevented from being operated when the circuitbreaker is closed. The mechanical interlocking interlocking facility can also be used to interlock breaker trucks of draw-out breaker parts. Dimensions and weights
The dimensions and weights of the vacuum circuitbreaker are shown in the relevant drawings. For planning purposes, the drawings showing detailed overall overall dimensions, can be ordered through the appropriate Siemens agency. The weight is also stated on the breaker rating plate.
Description Construction
The vacuum circuit-breaker consists of the mechanism housing (60.), the 3-pole assemblies with vacuum interrupters interrupters (30.), cast-resin post insulators (16.1 and 16.2) FRP bars (28.) and the switching bars (48.) with contact pressure springs (49.). Each of the three pole assemblies is supported by two cast-resin post insulators (16.1 and 16.2), which are bolted bolted to the rails rails / mounting mounting plate plate (15). (15). The main features of the 3AH3 vacuum circuit-breaker are shown in Fig. 2/1. The mechanism housing (60.) accommodates all electrical and mechanical elements e lements required for opening and closing the vacuum circuit-breaker. circuit-breaker. Fig. 2/2 shows the arrangement of the individual modules in the mechanism housing. The mechanism housing has a detachable cover 60.1 (Fig. 2/3).
20.
This cover (60.1) has cutouts for the actuating and indicating devices. The vacuum circuit-breaker circuit-breaker can be closed by means of the press knob (53.). The The motor (50.4) immediately recharges the closing spring (62.). In the event of motor power supply failure, the closing spring can be charged by means of a hand crank (50.). The cover includes an opening (50.1) (50.1) for the hand crank, behind which the hand crank coupling (50.5) of the gear box (50.2) is located. The stored-energy mechanism state is shown by the indicator (55.). The indicator (59.) shows the breaker state (ON - OFF). The operating cycle counter (58.) indicates the number of ON-OFF charging operations. The rating plate (51.) is attached to the gear box but is visible through an opening (51.1) in the cover. cover. The movement of the switching shaft is transmitted to the pole assemblies via switching bars (48.).
60.2
16.1
60.
30. 15. 28.
40.
48.
16.2
49.
Fig. 2/1 3AH3 vacuum circuit - breaker 7
51. 51.
68.7.1 69.
60.
68. or 68.0.1 62. 50.2
53.1 54.1
50.4.1 54.2, 54.3, 54.4
55.
68.1 59. 63. 58.
50 . 4
6 1.
66.
Fig. 2/2 View View of an open mechanism housing
51.1
Tightening Torque 10 10 Nm
50.1
60.1 53.
55.1
59.1
58.1
Fig. 2/3 Actuating Actuating and indicating devices 8
54.
The pole assembly consists of the top flange (20.) with the upper upp er terminal (27.), (27.), the vacuum interrupter in terrupter (30.), the bottom flange (40.) with the lower terminal (29.) the terminal (29.2.) with the current link (29.1.)
and the angled lever (48.6.). The central part (28.1.) and the FRP bars (28.) relieve the vacuum interrupters interrupters of external forces, see (Fig. 2/4).
20. 27. 27.
28.
30.
28.1
29.2 29.1
29.
40.
48.6
Fig. 2/4 3AH3 pole assembly
9
Vacuum interrupters
The basic construction of the vacuum interrupters for the 3AH3 vacuum circuit-breaker circuit-breaker is shown in the sectional view in Fig. 2/5. The vacuum interrupt interrupter er (30.) is fixed to the top flange (20. Fig. 2/4). The fixed contact contac t stem (31. (31.1) is connected directly with the interrupter interrupter housing. The The moving contact (36.) is fixed to the moving contact stem (36.1) and is located centrally in the moving contact guide (35.). The metallic bellows (34.) forms
the vacuum-proof connection to the interrupter interrupter housing. The vacuum interrupters fitted in the 3AH3 vacuum circuit-breakers circuit-breakers are type-approv t ype-approved ed in accordance with the X-ray regulations of the Federal Republic of Germany. They conform to the requirements of the X-ray regulations of January 8, 1987 (Federal Law Gazette Page 144) 144) 8 and Annex III Section 5 up to rated short-time AC voltage stipulated in accordance with DIN VDE/IEC. VDE/IEC.
31.1
32.
31. 31.
36. 34.
32.
35.
36.1
Fig. 2/5 Vacuum interrupter
Complement
The basic version of the vacuum circuit-breaker circuit-breaker comprises: – Electrical operating mechanism (charging motor) with electrical anti-pumping feature feature ................. (M1) – Closing Closing release release ............... ....................... ................ ............... ............... ........... ... (Y9) – 1st Shunt release ............... ....................... ................ ................ .............. ...... (Y1) – Socket for low-voltage low-voltage plug connector, connector, 32-pins (X0) – Auxiliary switch, 6NO + 6NC 6NC ....................... ..... (S1) – Position switch for signalling “Closing spring charged” charged” ............... ....................... ................ ........ (S41) (S41) – Operating cycle counter Each 3AH3 vacuum circuit-breaker can be also optionally equipped with the following following devices: – Low voltage-64 terminal socket ........................ (X0) – Extended auxiliary auxiliary switch switch 12NO 12NO + 12NC .......... (S1) 10
– 2nd shunt release release 3A 3AY15 Y15 10 ............................. (Y3) – 2nd Shunt release 3AX 3AX 1101 ............................. (Y2) – Current transformer-operated release 3AX 1102 ................................ ..................... (Y4,Y5) – Current transformer-operated release 3AX11 3AX1104 (0.1 (0.1 Ws) ..................................... ......... (Y6) – Undervoltage release 3AX 3AX 1103 ........................ (Y7) – Breaker Breaker trippin tripping g signal, cut-out cut-out switches switches .... (S6, S7) – Mechanical interlock with truck In addition to the standard shunt release (Y1), the 3AH3 vacuum circuit-breaker can be fitted with maximum of two releases of type 3AX 11. The permissible combinations of supplementary equipment equipmen t and special versio ns are stated on page p age 7.
Installation
Flat bar connection
Installing in a cubicle or on a truck
Prior to fitting fitting the connections, ensure smooth contact with their connecting parts and the holes in full alignment. When the busbar or the contact arms (isolating contacts) are fitted, fitted, the voltage strength between the top and bottom flanges must not be reduced (e.g. by reduction in the air clearance).
The 3AH3 vacuum circuit-breakers circuit-breakers are supplied in the open state with the “Closing spring discharged” discharged” indication (55.). Before Before installing the 3AH3 VCB, remove remove the transport devices (skids and spacers). Mount loose supplied phase barriers in accordance with the instructions. Before Before installing the 3AH3 vacuum circuit-breaker circuit-breaker in a cubicle or on a truck, truck, check its rating plate data and compare the rated supply voltage indicated in the delivery papers with the control supply available available at the site.
Rub the contact faces of busbars to be bolted together with criss-crossing strokes using a wire brush until bright metal shows and wipe them with a clean rag. Note! Copper-sprayed or silver-plated surfaces should be cleaned with a cloth and not rubbed.
On the vacuum circuit-breaker with with undervoltage release (Y7) 3AX1103, the arresting screw of the hammer must be moved from position A to B (see note card in mechanism housing [60.] of vacuum circuit-breaker).
Different Different contact materials (AI/Cu) must not be worked worked with the same cleaning tool. Thinly grease the bright contact faces with acid-free Vaseline Vaseline (e.g. (e.g . Shell Vaseline 8420) or equivalent anti-corrosion agent and bolt them together immediately.
On the mounting plate or the rails (15.) and on the mechanism housing (60.), there are a total of 14 fixing holes - to suit the various types of installation (Fig. 3/1). Use M12 fixing bolts - strength class 8 - making reference reference to the mandatory dimension drawings.
Note: Silver-plated Silver-plated parts must not be bolted together with aluminum busbars.
The rack or frame must be adapted to the operating conditions and have adequate load bearing capacity and stability.
Use appropriate M12 nuts and bolts of strength class 8 and corresponding spring elements and plain washers. Note! When tightening the terminal screws, counteract the torque (70 Nm ~ 7 mkp) by resisting it with a suitable spanner or socket wrench.
View Y 15.
Y
60
Z * Holes for M12 bolts
View Z
Fig. 3/1 Means of fixing 3AH3 vacuum circuit-breaker circuit-breaker
11
Control leads
Vacuum circuit-breakers circuit-breakers of standard design are provided with a 32/64-pole low-voltage socket connector connec tor (X0) (68.7.1). The correspondi co rresponding ng plug p lug for external connection is designed for crimp connection of control leads with a nominal sectional area of 1.5 mm2. Use a suitable crimping tool. Earthing
Connect the vacuum circuit-breaker to the appropriate high voltage protective earth by means of the suitable marked M12 M12 (70.) (see Fig. 3/2) terminal on the side of the mechanism housing (60.) using flat copper, copper cable or hot galvanized steel strip.
If the VCB VCB with the mechanism housing is installed in an earth metal rack so that firm electrical contact is established, the mechanism housing need not be earthed separately. When installing the breaker externally, teethed serrated washers (DIN 6798) must then be placed under the bolt heads. Circuit documents
The wiring of circuit-breakers circuit-breakers is shown in the circuit diagram supplied, depending on the equipment. Typical circuit diagrams for circuit-breakers are shown in Fig. 3/3 and 3/5.
70
Fig. 3/2 Earthing of VCB
12
Function schematic diagram
Fig. 3/3 3AH3 VCB with with manual manual closing closing with with 64-pin 64-pin socket.
HA HE K1 M1 P S1 S21 S21, S22 S22 S3 S4 X0 Y1 Y2/Y3 Y4 Y7 Y9 S16 V1 - V3
Fig. Fig. 3/4 3/4
Manual tripping Manual closing Anti-pumping contactor Motor operating mechanism Energy store Auxiliary switch Posit ositio ion n switc switche hes s (cut(cut-ou outt moto motorr afte afterr cha charg rgin ing g of closing spring) Position sw switch (o (opens wh when cl closing sp spring ch charged) Position switch (signals charged st at ate of closing spring) Socket of low-volt age plug connector 1st Shunt release 2nd Shunt release CT operated release Undervoltage release Closing release Aux. swi tc tch (o (operates in in te tes t & se servic e pos ititions) is is mounted on VCB truck Recti ectifi fier ers s for for moto motorr, tri tripp ppin ing g / clo closi sing ng rele releas ases es
Remai Remainin ning g contac contacts ts of aux. aux. sw switc itch h (6NO + 6NC) 13
Function schematic diagram
Fig. Fig. 3/5
3AH3 3AH3 VCB with with electric electrical al manual manual closing closing with 64-pin socket.
HA HE K1 M1 P S1 S21, S22 S22 S3 S4 X0 Y1 Y2/Y3 Y4 Y7 Y9 S16 V1 - V3
Fig. 3/6
14
Extended Extended aux. aux. switch switch (1 (12NO + 12NC) 12NC)
Manual tripping Manual Closing Anti-pumping contactor Motor operating mechanism Energy store Auxiliary switch Positio osition n switc switches hes (cut-o (cut-out ut moto motorr aft after er charg charging ing of closing spring) Positi on on switch (opens when cl os osi ng ng sp riring charged) Posit io ion switches (s ig ignal s charged st at ate of closi ng ng spring) Socket for low-volt age plug connector 1st Shunt release 2nd Shunt release CT operated release Undervolt age release Closing release Aux. swit switc ch (ope (operrate ates in test test & serv servic ice e posi positi tion ons) s) is mounted on VCB truck Recti Rectifie fiers rs for moto motorr, tripp trippin ing g / closin closing g rel relea ease ses s
Operation
Danger High voltage! Touching of live parts will result in death or severe personal injury. This equipment shall be operated only by qualified personnel after becoming thoroughly familiar with the operating instruction manual and in particular all safety instructions.
mechanical and electrical indication of the charging state of the closing spring. Actuate Actuate the mechanism as indicated under 4. and check the mechanical and electrical state indication. 6. Check Check the auxiliar auxiliary y switch switch S1 (68.) (68.) and and snap switches switches (50.4.1) (50.4.1) electrically in both end positions by actuating the vacuum breaker. 7. Also checkcheck-by by electrical electrical actuation actuation-the -the function function of the closing solenoid (Y9) (53.1) and all fitted shunt releases. When correct functioning of the VCB VCB has been ascertained to, it can be put into service.
Warning This equipment contains hazardous voltages and mechanical parts which move at high speed and may be controlled remotely. Non-observance of the safety instructions can result in severe personal injury or property damage. In particular: Do not remove the cover (60.1). Do not reach inside any openings in the operating mechanism. Do not touch pole assemblies (19.) and switching bars (48.). Commissioning
Prior to commissioning, check the VCB in accordance with the following points: 1. Clean them them as applicable applicable (for (for details details refer refer to “Cleaning” Cleaning” fig. 5/1). 2. Check Check all fixing and terminal terminal screws screws for for tightness tightness.. 3. Examine Examine the circuit-break circuit-breaker er for for any external external damage, especially to the control leads, post insulators and interrupters. interrupters.
Caution The VCB may be operated only with the original hand crank (50.), in order to avoid injuries as a result of the motor suddenly starting up. 4. Charge Charge the closing closing spring spring (62.) (62.) with the the hand crank crank (50.) (see Fig. 4/1), press the “close” close” press knob (53.) and after closing, trip the breaker by pressing the “open” open” press knob (54.). On the 3AH3 V-breaker with undervoltage release (Y7) 3AX1103, the arresting screw of the hammer must be moved from position A to B (see note card in mechanism housing [60.] of 3AH3 vacuum circuitbreaker). 5. For test operation operations s with the motor motor mechanism mechanism switch on the closing spring (62.). Check the 15
Charging the closing spring
When the supply voltage is applied, the motor (50.4) automatically charges the closing spring (62.) Should the power supply fail, the closing spring can also be charged by hand crank (50.). In the latter case, case, as shown in Fig. 4/1, the hand crank (50.) is inserted with the forwards pushed adapter (50.6) through the opening (50.1) (50.1) onto hand crank coupling (50.5) and turned clockwise, until the symbol “Closing spring discharged” discharged” shown in the indicator opening (55.1) is changed to “Closing spring charged” charged” (Fig. 4/2). The adapter (50.6) is designed so that the hand crank (50.) is decoupled on the recovery of the motor supply. Closing
If operation is not blocked by the mechanical interlock,
50.5
press the “Close” Close” press knob (53.) or the corresponding control switch until the 3AH3 vacuum circuit-breaker circuit-breaker closes and signals this state. After After closing (and, if applicable, releasing of the “Close” Close” press knob (53.), the closing spring (62.) is immediately and automatically recharged by the motor operating mechanism and the “closing spring charged” charged” (55.) indication becomes visible. Tripping
The opening spring (64., Fig. 2/2) is charged during closing. To trip the breaker press the “Open” Open” press knob (54.) or corresponding control switch until the VCB VCB trips and signals this state.
50. 50.1 53.
50.6
55.1
54.
50.
Fig. 4/1 Charging the closing spring with the hand crank.
Fig. 4/2 “Closing spring charged” charged”
Disposal of the product
The product is environmentally compatible. The following following materials have been used to make up the device: steel, copper, copper, aluminium, cast-resin, glassfibre-reinforced thermoplastics, rubber, porcelain, greases etc. PVC is used as an insulation material for control wires. In as-supplied condition, the product does not incorporate any hazardous substances. In operation, the product does not n ot emit any hazardous materials or gases.
16
During disposal of the product, care must be taken to dismantle as far as possible in more environmentally accepted way as recyclable & non- cyclable cyclable scraps i.e. steel, copper, aluminium, rubber, PVC, cast-resin & glass-fibre-reinforced materials segregated properly. The cyclable materials like steel, copper, aluminium can be reused. Non cyclable cyclable materials like cast-resins, glass-fibre-reinforced glass-fibre-reinforced etc can be broken in to pieces & then used as land filling materials. Local customer support-Siemens office office will be able to answer any any questions concerning disposal.
Maintenance
Servicing
Safety measures
General
Danger Maintenance, repair and subsequent conversion conversion work may be carried out only by specially trained personnel in accordance with the operating instructions and/or special conversions conversions instructions. Training and information sessions for personnel can be provided by the competent Siemens department. Before starting any work on VCBs, reference must be made to the local safety regulations for highvoltage switchgear. Switch off the power supply and then close and open the V-breaker by hand (vacuum circuit-breaker circuit-breaker in open state “closing spring discharged” discharged” indication visible).
The 3AH3 vacuum circuit-breakers are maintenancefree up to 10,000 operating cycles. By virtue of their design and a special routine testing process they can be used for up at least 30,000 cycles. In order to uphold the high level of reliability throughout the entire operating life, we recommend regular maintenance after every 10,000 operating cycles. The scope of maintenance work depends on the following following operating conditions: • Ambient conditions (temperature, air humidity, etc.) • Continuous current stress • Number of electrical operating cycles • Number of mechanical operating cycles
Non-observance can result in death, severe personal injury or substantial property damage. The following following table lists the necessary work: Maintenance schedule Sequence Work No.
Materials
Frequency
d e r i u q e r f I
1. 1.1 1.1 1. 2
Circuit-Breaker Visual inspection and cleaning if necessary Clean in insulating co components and breaker external parts Grease bearings and sliding surfaces as shown in Fig. 5/2. Perform 3 to 5 test operations of ON/OFF.
2. 2.1
Breaker pole Replace vacuum interrupters
3. 3.1 3.2
Breaker operating mechanism Replace motor M1 Replace closing spring
4. 4.1 4.2 4.3
Examine and replace if necessary All electrical devices in the drive Check all cable Leaking of shock-absorber
– – Warm water wate r, – Household detergent
– Isoflex Topas L32 grease – Ritzol Rostschutz 7-2 oil
s e . l c h y c e c g m n 0 i t a 0 r 0 , e 0 p 1 o
Remarks
s e . l c h y c e c g m n 0 i t 0 r a 0 , e 0 p 3 o
X
–
X
See note 1) See Fig. 5/2 Note 2 Note 3
X
X
While ordering replacement interrupters, state CB type, design code and serial number (see rating plate) Note 4
X X Note 5/Note 6 X X X
Fig. 5/1 Notes: 1) If the 3AH3 3AH3 vacuum vacuum circuit-b circuit-break reaker er is used used in unfavourable unfavourable indoor conditions (strong, frequent moisture condensation, dust-laden air etc.), we
recommend that the insulating parts and, if necessary, the external breaker parts be regularly cleaned at frequent intervals. 17
2) Joints Joints and bearings bearings which which cannot cannot be dismant dismantled led must not be treated with a cleaning agent prior to reapplication of anticorrosives. 3) Lubri ubrica cant nts: s:
4) The securing securing fastner fastners s used on all replaced replaced parts parts must also be renewed (spring washers, lock washers, splints, etc.). An assortment of securing fastners are offered by Siemens Representative Office. Order number n umber 3AY1550-0A 3AY1550-0A
– Bearings, sliding surfaces: Isoflex Topas Topas L 32 – Bearings inaccessible to grease and bearings of the auxiliary switch S1: Ritzol Rostschutz
5) The snap snap switches switches must must not be fitt fitted ed too tightly; tightly; i.e. the plunger of the position switch must move freely. 6) Replace Replace only if necessary necessary,, e.g. if the switching switching times are no longer complied with or mechanical damage has occurred.
Lubricants (for special requirement) are available from the Siemens agency on enquiry.
Key to parts
a
c
b
d
e f
g
h i
j p
Fig. 5/2
m
l
k
Isoflex Topas Topas L32 L 32 grease greas e Ritzol Rostschutz Oil
18
a
Lever ever for snap snap swit switc ch ope opera rati tion on
b
Bearing for lever
c
Cam disc
d
Lever for switc witch h-on -on blo block ck
e
Lever ever for oper operat atin ing g the the auxi auxili liar ary y switch
f
Auxiliary switch
g
Guid Guide e for openi pening ng spri spring ng
h
Oper Operat atin ing g rod rod of auxi auxili liar ary y swi switc tch h
j
Beari earin ng for switc witch hing ing shaf shaftt
k
Lever ever for swit switch ch-o -offf bloc block k
I
Lever on th the swi switc tchi hing ng shaf shaftt
m
Damping plate
p
Pi n for opening sp spring
Checking the contact system
The contact system is subject to wear by contact erosion as well as compression of the fixed & moving contacts and the stems. To check the contact wear, the moving contact stem (36.1) of the vacuum interrupter (30). is provided with the check mark (13.9) (13.9) Fig. 5/3. As long as the check mark is wholly or partially visible when the 3AH3 vacuum circuit-breaker is closed, the shortening of the contacts is within the permissible range. If in exceptional cases the check mark is no longer visible, but the interrupter has not yet reached the end of its electrical life, a new mark can be made, after resetting the stroke of the interrupter interrupter to nominal. Please contact your nearest Siemens office.
48. 48.6
Fig. 5/4 Lower pole support with switching bar
30.
13.9
48.6
Fig. 5/5 36.1
The atmospheric pressure will force the moving contact of a hermetically sealed interrupter into the “On On” ” position, causing lever 48.6 to move into the position shown in Fig. 5/5
Fig. 5/3 Check mark Checking the vacuum
Such a check should be made should there be any doubt of an interrupter having developed a leak. It is necessary in such cases to disconnect the VCB from the busbar and cable side. The check is performed performed with an HV test unit. Additionally, as a quick method, check the vacuum as follows: Open and isolate the breaker and detach the switching bar coupler 48. from lever 48.6 (Fig 5/4)
Fig. 5/6 A vacuum interrupter may may be assumed to be intact if it shows the following characteristics: An appreciable closing force has to be overcome when lever 48.6 is moved to the “Off” Off” position by hand (Fig. 5/6). When the lever is released, it must automatically return to the “On On” ” position and the contacts must be heard to close. After checking the vacuum, refit the lever 48.6 to the switching bar 48. 19
Accessories and recommended spare parts
When ordering spare parts state the following: following:
A hand crank 3AX 1530-2B for charging the closing spring can be supplied as an accessory.
1 Type designat designation, ion, design code and and serial serial number number of the 3AH3 vacuum circuit-breaker circuit-breaker (see rating plate).
Owing to the fact that all parts of this breaker type have been optimized to last the normal service life, it is not possible to recommend particular spare parts for keeping keeping in stock. Nonetheless, a list of standard spare parts is shown on page no. 23.
2 The designation designation and part number number, making reference reference to illustrations in these operating instructions or to a photograph or sketch as applicable. Alternatively, a sample may be submitted.
List of spares for 3AH3 VCBs SR. NO
30
53. 53.1/ 54.1
53.2 54.2
54.3 50.4 50.4 50.4.2 50.4.1 69
68.7.1 68.7 68.7.1 68 68.0.1 50 21 17
18 19 20
DESCRIPTION
Vacuum In Interrupter Vacuum Interrupter VS 17005, E1 Vacuum Interrupter VS 15102, E31 Vacuum Interrupter VS 30029, D21 Vacuum Interrupter VS 25007, G2 Clos Closin ing g / Tripp rippin ing g Rele Releas ase e (Y1/ (Y1/Y9 Y9/Y /Y3) 3) Closing/Tripping Release 24V DC Closing/Tripping Release 30V DC Closing/Tripping Release 48V DC Closing/Tripping Release 60V DC Closing/Tripping Release 110VDC Closing/Tripping Release 125VDC Closing/Tripping Release 220VDC Rectifier for closing / tr tripping release Second Shunt Re Release (Y (Y2) Second Shunt Release H86F-24V – 32V DC Second Shunt Release H86F-48V – 60 V DC Second Shunt Release H86F110V – 127V DC Second Shunt Release H86F-220V DC Second Shunt Release H86F-110V AC, 50Hz Second Shunt Release H86F-230V AC, 50Hz C T Operated Release H86W-0.5A (Y4) Motor 110 V DC (M1) Motor 220 V DC (M1) Rectifier for Motor (V1) Snap Switch (S21, S22, S3, S4) Aux. ux. Cont Contac acto torr for for elec electr tric ical al ant antip ipum umpi ping ng (K1 (K1)) Aux. Contactor 2 NO+2 NC 24V DC Aux. Contactor 2 NO+2 NC 30V DC Aux. Contactor 2 NO+2 NC 48V DC Aux. Contactor 2 NO+2 NC 60V DC Aux. Contactor 2 NO+2 NC 110V DC Aux. Contactor 2 NO+2 NC 220V DC Aux. Contactor 2 NO+2 NC 110V AC Aux. Contactor 2 NO+2 NC 220V AC 64 Pin Socket (X0) 32 Pin Pin Soc Sock ket (X0) (X0) Auxilliary Switch 6 NO + 6 NC (S1) Auxilliary Switch 12 NO + 12 NC (S1) Hand crank for spring charging Manual Handle Installation parts for Second Shunt / CT operated release for one release (Y3) for one release (Y2, Y4, Y7) for two releases (Y2, Y4, Y7) Kit of lock washers Lubricants and grease
MLFB
MATERIAL CODE -SAP
3AY1715-1B 3AY1715-1D 3AY1715-1L 3AY1715-1G
4109764026 4109764032 4109764033 4109764035
3AY1510-3BY 3AY1510-3MY 3AY1510-3CY 3AY1510-3DY 3AY1510-3EY 3AY1510-3NY 3AY1510-3FY 3AX1525-1F
4398095020 4398095021 4398095022 4398095023 4398095024 4398095025 4398095026 4109764015
3AX1101-2B 3AX1101-2C 3AX1101-2E 3AX1101-2F 3AX1101-2G 3AX1101-2J 3AX1102-2A 3AY1511-1E 3AY1511-1F 3AX1525-1F 3SE4206
4110660052 4110660063 4110660054 4110660055 4110660058 4110660059 4110660062 4109764016 4109764017 4109764015 4109764020
3TH30 22 0BB4 3TH30 22 0BC4 3TH30 22 0BW4 3TH30 22 0BE4 3TH30 22 0BF4 3TH30 22 0BM4 3TH30 22 0BG1 3TH30 22 0BN1 3AY0142-0Y — 3SV9273Y 3SV9274Y 3AX1530-2B 3AX1130-2A 3AX17 11-3E 3AX17 11-3A 3AX17 11-3B 3AY1550-0A 3AX1133-3A
3TH30 22 0BB4 3TH30 22 0BC4 3TH30 22 0BW4 3TH30 22 0BE4 3TH30 22 0BF4 3TH30 22 0BM4 3TH30 22 0BG1 3TH30 22 0BN1 4109764023 4112833001 4392133073 4392133074 4112871001/003 4110490001 4398163001 4107753006 4107753008 4109764024 4110522005
Central legend
14/1 4/15.
Rail Rail or Mou Mounti nting ng Plate Plate
53.
“CLOSE” CLOSE” press knob
16.1
Upper post insulator
53.1
Closing so solenoid Y9
16.2
Lower po post ins insu ulator
54.
“OPEN” OPEN” press knob
20.
Top flange
54.1
1st Sh Shunt re release Y1
27.
Upper terminal
54.2
2nd Shu Shun nt re release Y2
28.
FRP bar
54.3 54.3
Curr Current ent tran transf sfor orme merr-oper -operat ated ed relea release se Y4
28.1
Central part
54.4
Unde Underrvolta oltage ge rel relea ease se Y7
29.
Lower terminal
55.
“Closing spring charged” charged” indicator
29.1
Current link
55.1 5.1
29.2
Terminal
Openi pening ng for ind indicat icator or “Closing spring charged” charged”
30.
Vacuum interrupter
58.
Operating cycle counter
31.
Fixed contact
58. 58.1
Openi Opening ng for oper operat atin ing g cycle ycle coun counte terr
31.1
Fixed contact stem
59.
ON-OFF indicator
32.
Ceramic ho housing
59.1
Opening fo for “Close/Open” Close/Open” indicator
34.
Metallic bellows
60.
Mechanism ho housing (f (frame)
35.
Moving contact guide
60.1
Detachable co cover
36.
Moving contact
60.2
Cutout for hook
36.1
Moving contact stem
60.3
Crane hook symbol
40.
Bottom flange
61.
Shock absorber
48.
Switching bar
62.
Clos Closiing spr spring ing / Switc itch-on h-on spri spring ng
48.6
Angled lever
63.
Brea Break ker shaf shaftt / Sw Switc itching hing shaf shaftt
49.
Contact pressure spring (Compression spring)
64.
Openi pening ng spr spring ing / Switc itch-of h-offf spr sprin ing g
50.
Hand crank
66.
Damping plates
50.1
Openi pening ng for hand hand cran crank k
68.
Auxiliary sw switch S1 S1 (6 (6NO + 6NC)
50.2
Gearbox
68.0. 68.0.1 1
50.4
Motor M1
Extend Extended ed auxil auxiliar iary y switc switch h S1 (12NO + 12NC)
50.4 50.4..1
Snap Snap sw swit itc ch
68. 68.1
Tie rod rod (f (for auxi auxili liar ary y swit switc ch S1) S1)
50.5
Hand crank coupling
68.7.1
Low Low voltage voltage socket socket connector connector X0 (64-po (64-pole) le)
50.6
Adapt dapter er for hand handcr cran ank k
69.
Aux. Contactor
51.
Rating plate
70.
Earthing bolt M12
51.1
Open Openin ing g for for ratin ating g pl plate ate
21
Troubleshooting of 3AH3 VCBs Problem
Symptoms / Effect
Possible Causes / Reasons
Remedial Measures
Breaker fails to close.
1. Closing spring charges, but breaker does not close.
1. Electrical power to auxiliary circuit is off, or control fuses have blown. 2 . Loose connection, damage to wiring. 3 . No closing command to terminal 19 or A2 of socket 4 . Plug & Socket are not engaging. 5 . Unoperational closing release. 6. Aux. switch (S1) contact acts 21-22 are open when the breaker is closed. 7. Unop Unoper erat atio iona nall ant antii-pu pump mpin ing g contactor (K1) & its contacts 1. Electrical po power to auxiliary circuit is off, or control fuses have blown. 2 . Loose connection, damage to wiring. 3 . Plug & Socket are not engaging. 4. Unop Unoper erat atio iona nall char chargi ging ng moto motorr. 5. Limi Limitt switc witche hes s S21 S21 & S22 S22 fail to operate 6 . Mechanical failure of operating mechanism. Mec Me chani hanica call fai failu lurre of oper operat atin ing g mechanism.
1. Check electrical power to auxiliary circuit and/or replace blown fuses.
2 . Closing spring does not charge automatically.
Nuisance or false closing of breaker
3. Clos Closin ing g rel relea ease se ope operrates ates,, sound of breaker closing is heard, but breaker contacts do not close. 1. Electrical pr problem
2. Mechanical problem Breaker does not trip.
1. Tripping Release (Y1) does not trip. 2 . There is no tripping sound.
Nuisance or false tripping of breaker
1. Electrical problem 2 . Mechanical problem
1. Closing co command co continues on terminal 19 or A2. 2 . Terminal A2 of of cl closing release is is sh shorte rted to to ea earth rth. Mechanical cal failur lure of operating mechanism 1. Electrical power to auxiliary circuit if off, or control fuses have blown. 2 . Loose connection, damage to wiring. 3. No tripping com command to terminal 4 or C2 of socket. 4. Plug Plug & Soc Socket ket are not eng engagi aging. ng. 5 . Unoperational tr tripping release. 6. Aux. sw switch (S (S1) co contac tacts 23-24 are open when the breaker is closed. 1. Tripping command continues on terminal 4 or C2. 2. Mechanical failure of operating mechanism.
2. Check & repair as necessary. 3. Check for continuity & correct logic circuit. 4 . Check & repair. 5. Test closing release separately & then replace, if not operating. 6. Check & adjust mechanical linkage with aux. switch. 7. Chec Check k & repl replac ace, e, if ne nece cess ssar ary y. 1. Check electrical power to auxiliary circuit and/or replace blown fuses. 2. Check & repair as necessary. 3 . Check & repair. 4. Chec Check k & repl replac ace. e. 5. Chec heck & cont contac actt auth author oris ised ed serv servic ice e limit switch & correct. 6 . Check & cont act authorised service centres. Chec Check k & con conta tact ct auth author oris ised ed serv servic ice e centres.
1. Check & co correct logic circuits. 2. Check to find out if problem in wiring or or re release. Co Correct as as pe per requirement. Check & con contac tact authorised ser service ice centres. 1. Check electrical power to auxiliary circuit and/or replace blown fuses. 2. Check & repair as necessary. 3. Check for continuity & correct logic circuit. 4. Che Check ck & repai repairr. 5. Test tr tripping re release se separately & replace, if not operating. 6. Check & adjust me mechanical lilinkage with aux. switch. 1. Check & correct logic circuits. 2. Check & contact authorised service centres.
Siemens Ltd. Power Power Transmission & Distribution Division Medium Voltage Switchgear Thane Belapur Road, Thane 400 601. Tel. : +91 22 760 0135 Fax : +91 22 760 0134
Siemens Ltd. 22 PTD-03-118-019 (This replaces rep laces PTD-03-118-01 PTD-03-118-018) 8)
'Product development is a continuous process. Consequently, the data indicated in this Booklet is subject to change without prior notice. For the latest information please contact our Sales Offices.'
Order No. 4P-0502-03-98120-001AC Print Shop 030201
