Annexure-I SPECIFICATION SPECIFICATION FOR SF6 INSULATED RING MAIN UNIT (RMU)
1.0 INTENT OF SPECIFICA SPECIFICATIO TION N
1.1 1.1
This This speci specifi fica cati tion on is inten intende ded d to cove coverr the the manu manufa fact ctur ure, e, asse assem mbly bly, test testin ing g at manufacturer’s works, supply & delivery, properly packed for transport F.O.. site of Outdr t!"e 1#000 $%t SF6 In&u%'ted Rn M'n Unt with all accessories for
efficient and trouble free operation. 1.!
The scope scope of work work shall shall also also includ include, e, at the opti option on of the owner, owner, the supe supervi rvisio sion n of erection, testing & commissioning all e"uipment furnished under this specification.
#.0 SCOPE SCOPE OF *OR+ *OR+ #.1
! .1 . 1
Out door type, 1! #$, %'(, !1k()*ec, non e+tensible motoried type '1 >os. *F% ing -ain nits having 1no. De module and 1no. $ -odule
!.1.!
One set of special tools and tackles.
!.1.
*pare parts for Three years operation
!.1..1 !.1..1
/urren /urrentt Tran Transfo sforme rmerr 0!'')1 0!'')1,, 21'3 21'3 4 5ty nos nos..
! .1 . .!
/apacitive $oltage 6ndicator
!.1.. !.1..
-otor -otor for for *pri *pring ng /har /hargin ging g of $89 4 5ty 5ty 1no. 1no.
!.1..: !.1..:
9reaker 9reaker (u+il (u+iliar iary y /onta /ontact ct 9lock 9lock 4 5ty 5ty !nos. !nos.
!.1.. !.1..
;T insu insulat lating ing boot boot for for cable cable termi terminati nation on 4 5ty %nos %nos..
!.1.:
#.#
SCOPE OF SUPPL,
7 5ty 1no.
(ll relevant drawings, data and instruction manuals
SCOPE OF SER$ICES
The services of a *enior
(dvice (dvice on on proce procedur duree of erec erectio tion n to be be follow followed. ed.
!.!.! !.!.!
*uccess *uccessful ful test testing ing & commi commissi ssionin oning g of the e"uipm e"uipment ent..
#. ECL ECLUS USION ION FRO FROM M SCOPE SCOPE OF *O *OR+ R+
2age no 1 of 1
!..1
(ll concrete foundation works.
!..!
2ower and control cables for connection
.0 GENERAL RE/UIREMENTS
.1
CODES AND STANDARDS
.1.1
(ll e"uipment and materials shall be designed, manufactured and tested in accordance with the latest applicable 6ndian standards 06*3. The electrical installation shall meet the re"uirements of 6ndian
.1.#
.#
COMPLETENESS OF SUPPL,
.!.1
6t is not the intent to specify completely herein all details of the e"uipment. >evertheless, the e"uipment shall be complete & operative in all aspects and shall conform to highest standard of engineering, design and workmanship.
.!.!
(ny material or accessory which may not have been specifically mentioned but which is necessary or usual for satisfactory and trouble free operation and maintenance of the e"uipment shall be furnished without any e+tra charge.
.
GUARANTEED PERFORMANCE
The performance figures "uoted by the vendor shall be guaranteed within the tolerance permitted by relevant standards. 6n case of failure of the e"uipment to meet the guarantee, the e"uipment may be liable for re?ection.
.
DE$IATION
.:.1
*hould the bidder wish to deviate from the specification in any way, he shall draw specific attention to such deviation.
.:.!
(ll such deviations shall be clearly mentioned on the 8eviation sheet, with reference to the respective clause of the specification.
.
DRA*ING APPRO$AL
9efore starting manufacture of any e"uipment, the contractor shall have to take approval of relevant drawings and data from owner in writing. 2age no ! of 1
.6
/UALIT, ASSURANCE
.%.1
/ontractor shall follow his standard procedures for "uality assurance and control. The procedures shall be in such a form as to clearly delineate the manufacturing se"uence & ma?or inspection point.
.%.!
-anufacturing and "uality control procedures shall be available for audit to the Owner and)or its representative at the place of manufacture.
.0 SITE CONDITIONS
:.1 :.!
The e"uipment specified herein will be installed at owner 2lant situated at @@. The site is also connected to >ational ;ighway by an all weather metal road.
:.
<"uipment shall be packaged for transportation so as to meet the space and weight limitation of transport facilities, especially along the railroad right7of7way.
:.:
For the purpose of e"uipment design, the following data shall be taken into consideration= a3 (verage Arade
=
1B - above -*C
b3 (mbient (ir Temperature 0mean3
=
1.%o/0ma+.3, 1D.Eo/0min.3
c3 elative ;umidity
=
%E -a+imum
d3 Gind $elocity
=
1%! #m);r
e3 6soceraunic Cevel
=
!E.:
f3 *eismic Hone
=
Hone7666
.0 DESIGN CRITERIA
.1
The outdoor type *F% insulated ing -ain nits shall be used on secondary side of .!-$(, 11)11.k$ 6solation transformer.
.!
For continuous operation at specified ratings, temperature rise of the various panel components shall be limited to the permissible values stipulated in the relevant standards and)or this specification.
2age no of 1
.
The ing -ain nits and the components thereof shall be capable of withstanding the mechanical forces and the thermal stresses of the short circuit current without any damage or deterioration of material.
.:
The 8irect /able /onnection -odule shall have 1!k$, %' (mp 9us 9ars, earth switch, manometer, cable bushing interface & fitted with fi+ed type voltage indicator device as per 6
.
$acuum /ircuit 9reaker -odule shall be %' (mp tee off spring assisted type vacuum circuit breaker unit suitable for 1!k$, with provision of making O>)OFF by manual spring charging and by electrical motor, with at least D>OID>/ cam operated au+iliary contacts, with O>)OFF)Trip indication 0!!'$ 8/ C<8 type lamps3 at panel, control voltage !!'$ 8/ for motor operation, with Are2' 3'4e P1# "rte5tn re%'! 0with
core current transformers of !'')1 & 21' class and fitted with fi+ed type voltage indicator device as per 6
The ring main units are to be installed at outdoor remote locations. Therefore, suitable protection to be provided against Cightening *urges.
.
.8
MEC7ANICAL DATA
2ressure of *F% gas
=
1.: bar at !' '/
Temperature /lass
=
073 ! ' / 7 I:'' / outdoor
8egree of 2rotection
= *F% Tank
=
62%B
=
62:
Front /over
=
62!J
/able /over
=
62J
9usbars
=
!:' mm!
/u
=
1!'mm!
/u
Thickness of *tainless *teel Tank
=
!. mm
ated $oltage
=
1! k$
ated fre"uency
=
';H ±
ELECTRICAL DATA
2age no : of 1
ated /urrent for 9us 9ars
=
%' (
*hort time with stand current 0 sec3
=
!1 k( -*
ated /urrent for transformer T7off
=
%' (
6mpulse withstand voltage
=
E k$
=
!Dk$
0To earth and between phases3 6nsulation Cevel 02ower fre"uency 1min.3
6.0 SPECIFIC RE/UIREMENTS
6.1
CONSTRUCTION
%.1.1
The *F% ing -ain nits shall be 1!k$, 2hase7Gire, ';, outdoor, free7standing, metal7clad, 627: on7e+tendable type.
%.1.!
The - shall be suitable for cable termination from the front having bolted arc proof cable doors. The overall design of the switchgear shall be such that front access only is re"uired.
%.1.
The *F% insulated ing -ain nits shall accommodate all live parts and switching e"uipments in a robotically laser welded stainless steel tank having 62%B degree of protection.
%.1.:
The ring main unit shall be of the fully arc proof, flush fronted type, consisting of modules assembled into one or more un its.
%.1.
The cubicle shall have a pressure relief device. 6n the rare case of an internal arc, the high pressure caused by the arc will release it, and the hot gases is allowed to be e+hausted out at the bottom of the cubicle. ( controlled direction of flow of the hot gas should be achieved.
%.1.%
The ring main unit shall have separate CT compartment for control wiring and indications.
6.#
%.1.B
(ll hardware used for panel fabrication & assembling shall be of ** material.
%.1.D
(ll panel doors shall be earthed through fle+ible copper wires.
%.1.E
(ll hinges shall be ** material.
APPLICA9LE STANDARDS
2age no of 1
-etal
=
6
Aeneral 2urpose *witches
=
6
8isconnectors and
=
6
/ircuit 9reakers
=
6
/ommon /lauses
=
6
/able 9ushings
=
86> :B%%
6.
DIRECT MODULE
%..1
8irect cable connection module with busbars and earthing switch, shall have a minimum of following electrical specifications & features= 0i3
8irect cable connection 1!k$, %' (, !1 k( for sec.
0ii3
/able bushings, %' ( suitable for 11#$, JC2<, (luminium cable of sie /+'' *". mm.
0iii3
(rc proof cable cover including 6nterlocking with earth switch
0iv3
/apacitive voltage indication 0fi+ed type3
0v3
-anometer
0vi3
2ressure release safety devices.
%..!
6t shall consist of an *F% cubicle housing busbars and an earthing switch.
%..
9usbars and all electrical connections shall be located inside the tank. The operating shafts for earthing switch shall have rotary seals where they enter the *F% cubicle. The operating mechanism shall be located outside on the front of the *F% tank.
%..:
The cable bushings shall be located on the front of the *F% cubicle in a separate cable compartment. Front covers containing the mimic diagram and having a degree of protection 62!J close the front.
%..
OI!>/ contacts for remote indication.
%..%
The
6.
$ACUUM CIRCUIT 9REA+ER MODULE
%.:.1
$acuum circuit 9reaker module with vacuum circuit breaker, with disconnector7 earthing switch, busbars, interlocking, earthbar and stored spring energy mechanism shall have following specifications & features= 2age no % of 1
0i3
$acuum circuit breaker 1!k$, %'(, !1k( for sec.
0ii3
!!'$ 8/ motor operated spring charging mechanism
0iii3
*tored energy mechanism for manual operation
0iv3
9reaker cam operated au+iliary contacts,1'( 8/ 0minimum D>OID>/3
0v3
O>, OFF & Trip indication at panel
0vi3
/ontrol *upply !!'$ 8/
0vii3
2rotection relay, -6/O- make, -odel 21! with earth fault setting range '.'1 to D times of line current, au+iliary supply ! !'$ 8/
0viii3
ing /ore current transformer, 21' accuracy class, !'')1 ratio
0i+3
/able bushings, %' ( suitable for 11#$, JC2<, (luminium cable of sie /+'' *". mm.
0+3
(rc proof cable cover including 6nterlocking
0+i3
/apacitive voltage indication 0fi+ed type3
%.:.!. The circuit breaker module shall consist of an *F% cubicle housing a circuit breaker unit and a disconnector7earthing switch. For isolation of the circuit breaker and safety of the operator, a disconnector switch shall be provided in line with the breaker. %.:.
The $acuum breaker, disconnector switch, earthing switch and its cable covers shall be operated in the se"uence and interlocked with each other. 6t shall not be possible to open the cable cover when earthing switch is not in earth position. *imilarly the earthing switch shall not be closed when the disconnector switch is in O> position. The circuit breaker shall be closed only when the disconnector switch is in O> position.
%.:.:
9usbars and all electrical connections shall be located inside the tank. The operating shaft for the switches shall have rotary seals where they enter the *F% cubicle. The operating mechanisms shall be located outside on the front of the *F% tank. /able bushings shall be located on the front of the *F% cubicle in a separate cable compartment. Front covers containing the mimic diagram and having a degree of protection 62!J/ seal off the fronts.
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OI!>/ contacts for remote indication
%.:.%
The switch disconnector and earthing switch shall have padlocking facility.
2age no B of 1
%. /ircuit 9reakers shall use vacuum bottles as interrupters of the currents. The circuit breaker main circuit should be connected in series with a disconnector switch for isolation purpose.
6.
CA9LE TERMINATION
%..1
The ing -ain nit -odules shall be designed for cable entry from the bottom. *ufficient space shall be provided for ease of termination and connection.
%..!
2ower /able shall be JC2< insulated, 11k$ grade, armoured, overall 2$/ sheathed with stranded (luminum conductor of sie not less than /+'' *". mm.
%..
(ll provision and accessories shall be furnished for termination and connection of cables, including removable gland plates, cable supports etc.
%..:
The gland plates shall be minimum : mm thick. The gland plate and supporting arrangement for 6)/ 2ower cables shall be such a s to minimie flow of eddy current.
%..
The cable termination chamber for CT cables shall be completely isolated from ;T cable termination chamber.
%..%
The ring main unit shall have space heater with thermostats provided at both ;T cable termination compartments. (u+iliary supply for space heater shall be !'$, '; (/.
6.6
EART7ING S*ITC7
6.
9US9ARS
- shall be comprising of 72hases copper busbars and the connections to the switch or circuit breaker. The busbar shall be integrated in the cubicle. 9usbars shall be rated to withstand all dynamic and thermal stresses. The busbars shall be inside the *F% gas chamber made of !.7mm stainless steel sheet.
6.8 GROUND 9US
2age no D of 1
( ground bus rated to carry ma+imum fault current shall e+tend full length of the switchgear and shall be pro?ected outside the panel on both sides so that it can be connected to B+Dmm A6 earthing stip.
6.:
CA9LE COMPARTMENT
%.E.1
6t shall be possible to terminate 11k$, armoured, aluminium conductor, JC2< insulate, /+'' s". mm. ;$ cables.
%.E.!
The access to the compartment shall be possible by removing the arc proof cable cover, bolted to the main frame.
%.E.
%.E.:
The ground continuity shall be achieved when the covers are in place by means of bolted connections.
%.E.
The cable covers shall be interlocked to the corresponding earthing switch of the module.
6.10
CONTROL SC7EME
The /ontrol *cheme shall have atleast of following features= %.1'.1 $/9 O> indication at - panel %.1'.! $/9 OFF indication at - panel %.1'. $/9 T62 indication at - panel. %.1'.: !>OI!>/ contacts of earth switch for remote indication %.1'. !>OI!>/ contacts of disconnector switch for remote indication
2age no E of 1
%.1'.% $/9 /CO*6>A circuit shall have electrical interlock with disconnector switch O> position and earth switch OFF position. %.1'.B $/9 /CO*6>A circuit shall have interlock with 9us ;ealthy and 9us OID>/ contacts for remote indication and interlocking with upstream breakers. %.1'.E $/9 T62 !>OI!>/ contacts for remote interlock and indication %.1'.1' $/9 mechanical O> command from - panel. %.1'.11 $/9 mechanical OFF command from - panel. %.1'.1! $/9 OI!>/ contacts re"uired for remote annunciation and interlock. %.1'.1: /ontrol should not permit $/9 closing if Cow Aas 2ressure /ondition e+ist.
6.11
NAMEPLATES
%.11.1 >ameplates of approved design shall be furnished at each module and at each instruments and device mounted on or inside the -. %.11.! The material shall be lamicoid or approved e"ual, mm thick with white letter on black background.
6.1#
TROPICAL PROTECTION ; PAINTING
%.1!.1 (ll e"uipments, accessories and wiring shall have fungus protection, involving special treatment of insulation and metal against fungus, insects & corrosion. %.1!.! *creens of corrosion resistant material shall be furnished on all ventilating louvers to prevent the entrance of insects. %.1!. (ll surfaces shall be sand blasted, pickled and grounded as re"uired to produce a smooth, clean surface free of scale, grease and rust.
6.1 ACCESSORIES<
(ll the re"uired accessories in the each module shall be provided. *ome for the (ccessories are listed as below= 0i3
/able *upport 9ars 2age no 1' of 1
0ii3
/able boots
0iii3
-anometer for *F% pressure)density monitoring
0iv3
0v3
Cifting Cugs
0vi3
(u+. *witch for circuit breaker 2osition
0vii3
(u+. *witch for disconnector position
0viii3
(u+. *witch for
0i+3
Operating ;andle 4 !>os.
0+3
2adlock with keys for all earthing and disconnector switches
0+i3
2anel #ey 4 :nos.
6.1 SINGLE LINE DIAGRAM
6.1 TENTATI$E GENERAL ARRANGEMENT DRA*ING
2age no 11 of 1
2age no 1! of 1
.0 TESTS
B.1
The ing -ain nit shall be completely assembled, wired, ad?usted and tested at the factory as per the relevant standards.
.#
Rutne Te&t
The tests shall include but not necessarily limited to the following=
2age no 1 of 1
a.
Operation u nder simulated s ervice condition t o ensure a ccuracy of wiring, correctness of control scheme & proper functioning of the e"uipment.
b.
(ll wiring and current carrying part shall be given appropriate ;6 $oltage test.
c.
2rimary current shall be applied to all instrument transformers.
d.
outine test shall be carried out on all e"uipment such as /ircuit 9reaker panel, instrument transformers, relays, meters etc.
e.
2rotection *cheme shall be checked by primary in?ection method and test certificates for the same shall be submitted.
.
Te&t *tne&&
(ll tests shall be performed in presence of Owner’s representatives. The contractor shall give at least thirty 0'3 days advance notice of the date when tests are to be carried out. . Te&t Cert=5'te
B.:.1
/ertified reports of all the tests carried out at the works shall be furnished in si+ 0%3 copies for approval of the Owner.
B.:.!
Type test certificate on any similar e"uipment shall be furnished to prove the design.
8.0 SPECIAL TOOLS ; TAC+LES
( set of special tools & tackles, which are necessary or convenient for erection, commissioning, maintenance and overhauling of the e"uipment shall be supplied.
:.0 SPARES
The 9idder shall submit the itemied price for spares along with their offer.
10.0
DRA*INGS> DATA ; MANUALS
1'.1
8rawings, 8ata & -anuals shall be submitted with the bid and in "uantities and
procedures as specified in Aeneral /onditions of contract and)or elsewhere in the specification for approval & subse"uent distribution after the issue of Cetter of 6ntent.
T ?e &u?3tted @t te 9d<
a. Aeneral arrangement drawing showing constructional features 2age no 1: of 1
b. 9ill of -aterials c. Technical leaflets
T ?e =urn&ed =r A""r2'% 'nd D&tr?utn<
a. Outline dimensional 8rawing of the - 2anel showing general arrangement, space re"uirements and cable entry points. b. Foundation plan and loading c. *ingle line diagram d. /ontrol *chematics & wiring diagrams e. 6nstruction -anuals of - -odules
Sx Set& of final approved drawings in well bound form shall be submitted after
completion of contract.
2age no 1 of 1
