Relay Testing Procedure

LINE CONTROL AND RELAY PANEL 1) R& B Phase Directional Over Current Relay: TESTING CIRCUIT: 67-R A

KIT

U 1 U 2 Tm1

9

TIMER 3

4

N O

N C

10

Tm2

PICK UP CHECKS: Relay pick up at rated setting = Disc complete rotation at the above setting =

Procedure: 1) Make the connection as per the circuit except timer connection. 2) Enure the110VAC to 07 & 08 terminal of the relay. 3) Go on increasing the current to the terminals 9&10 until the disc starts rotation,for rated plug setting,note down the injected. 4)When the disc stop the rotation,slightly increase the current until the disc closes the relay contacts ,then notedown current reading. TIMING CHECKS:

PSM

TMS

Current injected (A)

Relayoperating time (secs)

Exptd time (secs)

Procedure: 1) Make the connection as per the circuit except timer connection. 2)For timing checks,first set the two times of PSM in the current injection kit. 3)Connect the kit "relay contacts".to relay terminals 03 & 04. 4) Inject the setting (Twice) current, disk rotation completes,timer will be stopped then note down the relay operated 5)Check & ensure the relay optd time with expected time. 6) Repeat the same procedure for 3 times of PSM. 1)Earth fault relay (67N) should be kept out for unnecessary relay operating. 2)Ensure kit inbuilt timer is zero position before timing checks.

3)For pickup checks : +5 % acceptable tolerance for relay pick up. +30% accptable tolerance for disc complete rotation.

2) Directional Earth Fault Relay: TESTING CIRCUIT: 67-N V A R I A C

TIMER

7

3

8 9

4 10

N O

N C

A KIT PICK UP CHECKS: Relay pick up at rated setting = Disc complete rotation at the above setting =

Procedure: 1) Make the connection as per the circuit except timer connection. 2) Apply 63 V to the voltage terminals 7 & 8 of the relay . 3) Go on increasing the current to the terminals 9&10 until the relay disc pick up,then note down the current injected. 4)When the disc stop the rotation,slightly increase the current until the disc closes the contacts,then notedown the sa current reading. TIMING CHECKS:

PSM

TMS



Procedure: 1) Make the connection as per the circuit except timer connection.

Exptd time (secs)

2)For timing checks,first set the two times of PSM in the current injection kit. 3)Connect the kit "relay contacts".to relay terminals 03 & 04. 4) Inject the setting (Twice) current, disk rotation completes,timer will be stopped then note down the relay operated 5)Check & ensure the relay optd time with expected time. 6) Repeat the same procedure for 3 times of PSM.

TRANSFORMER CONTROL AND RELAY PANEL 1) Over Current Relay (inverse) 51-1: TESTING CIRCUIT: 51-1 A

KIT

U 1 U 2 Tm1

9

TIMER 3

4

N O

N C

10

Tm2


Procedure: 1) Make the connection as per the circuit except timer connection. 2) Go on increasing the current to the terminals 9&10 until the relay disc pick up,then note down the current injected. 3)When the disc stop the rotation,slightly increase the current until the disc closes the contacts,then notedown the sa current reading. TIMING CHECKS:

PSM

TMS



Exptd time (secs)

Procedure: 1) Make the connection as per the circuit except timer connection. 2)For timing checks,first set the two times of PSM in the current injection kit. 3)Connect the kit "relay contacts".to relay terminals 03 & 04. 4) Inject the setting (Twice) current, disk rotation completes,timer will be stopped then note down the relay operated 5)Check & ensure the relay optd time with expected time.

6) Repeat the same procedure for 3 times of PSM. 2) Earth Fault Relay (51-N): TESTING CIRCUIT:

51-N A

KIT

U 1 U 2 Tm1

9

TIMER 3

4

N O

N C

10

Tm2


Procedure: 1) Make the connection as per the circuit except timer connection. 2) Go on increasing the current to the terminals 9&10 until the relay disc start up,then note down the current injected 3)When the disc stop the rotation,slightly increase the current until the disc closes the contacts,then notedown the sa current reading. TIMING CHECKS:

PSM

TMS



Exptd time (secs)

Procedure: 1) Make the connection as per the circuit except timer connection. 2)For timing checks,first set the two times of PSM in the current injection kit. 3)Connect the kit "relay contacts".to relay terminals 03 & 04. 4) Inject the setting (Twice) current, disk rotation completes,timer will be stopped then note down the relay operated 5)Check & ensure the relay optd time with expected time. 6) Repeat the same procedure for 3 times of PSM. 3) Neutral Earth Fault Relay (51-TN): TESTING CIRCUIT:

51-TN A

KIT

U 1 U 2 Tm1

9

TIMER 3

4

N O

N C

10

Tm2


Procedure: 1) Make the connection as per the circuit except timer connection. 2) Go on increasing the current to the terminals 9&10 until the relay disc starts up,then note down the current injecte 3)When the disc stop the rotation,slightly increase the current until the disc closes the contacts,then notedown the sa current reading. TIMING CHECKS:

PSM

TMS



Exptd time (secs)

Procedure: 1) Make the connection as per the circuit except timer connection. 2)For timing checks,first set the two times of PSM in the current injection kit. 3)Connect the kit "relay contacts".to relay terminals 03 & 04. 4) Inject the setting (Twice) current, disk rotation completes,timer will be stopped then note down the relay operated 5)Check & ensure the relay optd time with expected time. 6) Repeat the same procedure for 3 times of PSM.

4) Restricted Earth Fault Relay (64-R): TESTING CIRCUIT:

64-R

A

KIT

U 1 U 2

9

10

PICK UP CHECKS: Relay flaf drop off = Relay reset = Procedure: 1) Make the connection as per the circuit. 2) Go on increasing the current to the terminals 9&10 until the relay flag drops off ,note down the current injected. 3) Slowly decrease the current to terminal 9 & 10 till the flag will reset,notedown the relay reset current. 5) Under voltage Relay (27): TESTING CIRCUIT: 2NO+2NC CONT 27-T NO

3-Ø VARIAC

9

10

NC

P

NC

N

NO

PICK UP CHECKS:

1-Ø,240 v

N P 1-Ø VARIAC

Relay pick up at rated setting = Disc complete rotation at the above setting =

Procedure: 1) Make the connection as per the circuit diagram. 2) Go on increasing the voltage to the terminals 9&10 until the relay disc pickup,then note down the voltage injected.

3)When the disk rotation stops ,slightly increase the voltage until the contact closed,then notedown the same voltag

3)When the disk rotation stops ,slightly increase the voltage until the contact closed,then notedown the same voltag TIMING CHECKS:

PSM

TMS

Voltage injected (A)


Exptd time (secs)

Procedure: 1)For timing checks,first set the 75% PSM in the 1-Ø variac. 2)Apllied the 110 volts to relay through 3-Ø variac. 3)Simultaneously Put off the auxilary supply of contactor and put on the timer (Stop Watch) . 4)When relay disk rotation completes, stopped timer then note down the relay operated time. 5)Check & ensure the with in limits of relay optd time with expected time. 6)Next,do the same procedure for 50 % times of PSM.

GENERATOR RELAY AND MERTERING PANEL 1)STATOR EARTH FAULT RELAY: TESTING CIRCUIT:

64-S 9 VARIAC

P V N

10

PICK UP CHECKS: Relay pickup at = Disk complete rotation at =

Procedure: 1) Make the connection as per the circuit connection. 2) Go on increasing the voltage to the terminals 9&10 until the relay disc pick up,then note down the voltage injected

3)When the disk rotation stops ,slightly increase the voltage until the contact closed,then notedown the same voltag TIMING CHECKS: Voltage

Relayoperating

Exptd time

PSM

TMS

injected (A)

time (secs)

(secs)

Procedure: 1)For timing checks,first set the 2 times of PSM in the variac. 2)Simultaneously Put on the variac and put on the timer (stop watch) . 3)When relay disk rotation completes, stop the timer then note down the relay operated time. 4)Check & ensure the with in limits of relay optd time with expected time. 5)Repeat the same procedure for 3 times of PSM.

2) REVERSE POWER RELAY: Testing circuit

32-P V A R I A C

K I T

TIMER

7

3

8 9

4 10

N O

N C

A

PICK UP CHECK. Pick up at: Drop out at : Procedure: 1) Make the connection as per the circuit except timer connection. 2) Apply 110 V to the voltage terminals 7 & 8 of the relay 3) Go on increasing the current through (Variable Rehostst) to the terminals 9&10 until the relay pick up. notedown the current injected. 4)Go on decrease the current to the current to the terminals until the relay drop out ,then note down the current.

TIMING CHECKS: 1) Make the connections as per the circuit diagram. 2)Set the pick up current,set the time in relay and voltage(110 V )to be applied to the relay. 3)Switch on the kit, and note down the time operate. 4)next,do the same procedure for another two time settings.

Time set

current injected

Voltage Applied(v)

operating time

NOTES: 1)Ensure kit inbuilt timer is zero position before timing checks. 3) NO VOLTAGE RELAY(40 V): TESTING CIRCUIT: 40-V 7 VARIAC

P V N

8

PICK UP CHECKS: Pick up at: Drop out at : Procedure: 1) Make the connection as per the circuit connection. 2) Go on increasing the voltage to the terminals 7&8 until the relay pick up,then note down the voltage injected. 3) Go on decreasing the voltage until the relay drop out,then note down the voltage injected. 4) NEGATIVE PHASE SEQUENCE RELAY(46): TESTING CIRCUIT KIT

46

TIMER

A

7&8

UI 11&12

3 4

N C

N O

U2 Tm1 Tm2 PICK UP CHECKS: Relay Pick up at : PROCEDURE

1)'Make the connection as for the circuit diagram shown and connect the two coils in series (Except timmer) 2) Go on increasing the current to the terminals 7&8 and 11&12 until the relay pick up,then note down the current inj TIMING CHECKS TIME SETTING A-B A-C B-C

OPTD TIME

1)'Make the connection as for the circuit diagram shown. 2) Set the current(pick up) to operate the relay. 3)Switch on the kit & note down the operated time . 4)Check & ensure the with in limits of relay optd time with setting time. 5)Repeat the same procedure for other time setting.

5) VOLTAGE CONTROLLED OVER CURRENT RELAY(51): CKT DIAGRAM:

51-V K I T

9 10 7

VARIAC

TIMER

A 3 4 8

N C N0

PICK UP CHECKS: R-ph

Y-ph

B-ph

Element pick up at : Drop off at :

PROCEDURE

1)'Make the connection as for the circuit diagram shown(Except timmer) 2) Go on increasing the voltage to the terminals 7&8 until the relays (R,Y&B) element pick up,then note down the vol injected. 3) Go on decreasing the voltage until the relays(R,Y&B) drop off,then note down the voltage injected. R Phase at 110 V at O V

Y Phase at 110 V at O V

Relay pick up at present setting Disk Complete rotation at Present setting PROCEDURE PICK UP CHECK AT 110 VOLT 1) Make the connection as per the circuit diagram shown.(Except timmer connection) 2) Apply 110 Volt to the votage terminal 7&8 of the relay by variac 3)Go on incressing the current to the terminal 9&10 until the disc starts to move 4) After disc stops from intial movement slightly increse the current disc start to rotate and closes the contact. PICK UP CHECK AT 0 VOLT 1) Make the connection as per the circuit diagram shown.(Except timmer connection) 2)Go on incressing the current to the terminal 9&10 until the disc starts to move 3) After disc stops from intial movement slightly increse the current disc start to rotate and closes the contact. TIMING CHECKS

Phase.

PSM

TMS

Current Time for operation Injected(A) at 110 V at 0 V

B Phase at 110 V

R

Y

B

PROCEDURE 1) Make the connection as per the circuit diagram shown. 2)For timing checks,first set the two times of PSM in the current injection kit. 3) Apply 110 Volt to the votage terminal 7&8 of the relay by variac 4)Connect the kit "relay contacts".to relay terminals 03 & 04 5)Switch on the kit, relay disk rotation completes,timer will be stopped then note down the relay operated time. 6)Check & ensure the relay optd time with expected time. 7)Repeat the above procedure without applying voltage. 8) Repeat the same procedure for 3 times of PSM.

6) OVER VOLTAGE RELAY(59): TESTING CIRCUIT:

59 9 VARIAC

P V N

10

PICK UP CHECKS: % V(inst)

% V(t)

Actual (inst)

voltage

t (sec)

voltage optd

optd time

Procedure: 1) Make the connection as per the circuit connection. 2) First set the 115V in Instatenious coil Go on increasing the voltage to the terminals 9&10 until the relay pick up,the 3) This voltage tripping shall be operated through timer.

4) Then go on increasing the voltage until the relay pick up & 86G tripping instantaneously ,then note down the volt injected.

TIMING CHECKS: % V(inst)

% V(t)

Actual (inst)

voltage(t)

t (sec)

Vn(inst)

Vn(t)

Procedure: 1)For timing checks,first set the 110% of PSM (t) in the variac. 2)Simultaneously Put on the variac and put on the timer(in mobile) . 3)When relay contact closes, stopped timer then note down the relay operated time. 4)Check & ensure the with in limits of relay optd time with expected time. 5)Next,do the same procedure for 2 ,3 & 4 secs. NOTES: 1)Field filure , reverse power and over votage relays should be kept out for unnecessary relay operating. 2)For pickup checks : +5 % acceptable tolerance for relay pick up. +30% accptable tolerance for disc complete rotation.

7) DIFFRENTIAL RELAY(87-G): TESTING CIRCUIT:

KIT

R Y B N R Y B N

CTTB-2 1 2 3 4 5 6 7 8

87-G R-PHASE Y-PHASE B-PHASE

PICK UP CHECKS: R-ph Element pick up at : Drop off at :

PROCEDURE

Y-ph

B-ph

1)'Make the connection as per the circuit diagram . 2) Go on increasing the current to the terminals CTTB-1 & 5 until the relay R-Ph element pick up,then note down the injected. 3) Go on decreasing the current until the relay drop out,then note down the current injected. 4)Check & ensure the with in limits of relay optd cuurent with setting current. 5)Next,do the same procedure for Y & B Phases. 7) FIELD FAILURE RELAY(40): 40-G A

M=multimeter

5

KIT

3

6

'M

9 10

4 7

8

VARIAC V

Pick up check 1) Make the connection as shown above. 2) Connect the multimeter to 3&4 terminal 3)Short the terminal 6&9 4)Apply 110 V to the terminal 7&8 of the relay. 5) Inject the current '0.4A to the terminal 5&10 of the relay. 6)Reduce the voltage to 7&8 from variac till terminal 3&4 become NC.Then note down voltage Drop off check 1) Now set the current 0.8A to terminal 5 & 10,further go on redusing voltage to terminal 7&8 until terminal 3&4 bec NO from NC, note down the voltage. 2) Calculate the relay pick and drop off voltage by using formula as mentioned below. Pickup check:Vs = 2I (K1*K5 +K3+K5) Drop off check:Vs = 2I (K3+K4)

SYNCHRONIZING PANEL 1)NEUTRAL DISPLACEMENT RELAY: TESTING CIRCUIT:

64-B 9 VARIAC

P V N

10

PICK UP CHECKS: Relay pickup at = Disk complete rotation at = Procedure: 1) Make the connection as per the circuit connection. 2) Go on increasing the voltage to the terminals 9&10 until the relay pick up,then note down the voltage injected.


PSM

TMS



Exptd time (secs)

Procedure: 1)For timing checks,first set the 2 times of PSM in the variac. 2)Simultaneously Put on the variac and put on the timer (stop watch) . 3)When relay disk rotation completes, stop the timer then note down the relay operated time. 4)Check & ensure the with in limits of relay optd time with expected time. 5)Repeat the same procedure for 3 times of PSM.

2) Under voltage Relay (27-S): TESTING CIRCUIT: 2NO+2NC CONT 27-S NO

3-Ø VARIAC

9 NC

P

10

NC

N

NO

1-Ø,240 v

N P 1-Ø VARIAC

PICK UP CHECKS:

Relay pick up at rated setting = Disc complete rotation at the above setting =

Procedure: 1) Make the connection as per the circuit diagram. 2) Go on increasing the voltage to the terminals 9&10 until the relay disc pickup,then note down the voltage injected.


PSM


TMS


Exptd time (secs)

Procedure: 1)For timing checks,first set the 75% PSM in the 1-Ø variac. 2)Apllied the 110 volts to relay through 3-Ø variac. 3)Simultaneously Put off the auxilary supply of contactor and put on the timer (Stop Watch) . 4)When relay disk rotation completes, stopped timer then note down the relay operated time. 5)Check & ensure the with in limits of relay optd time with expected time. 6)Next,do the same procedure for 50 % of PSM.

3) CHECK SYNCHRONIZING RELAY (25): TESTING CIRCUIT: 25

5 0-250V VARIAC

'V 7 8

10

'V

PICK UP CHECKS: Pick up at: Drop out at :

Procedure: 1) Make the connection as shown above circuit. 2)Apply the rated voltage and check wether relay operates.this indicates the relay operation when the two supply are in phase.Note down voltage at which the relay pick up. 3)Go on decreasing the voltage upto relay drop out,then note down the same voltage. 4) Reverse the connections to one of the i/p traf of the relay i.e if the rated voltage is 110V inter change either terminals 8and 10 or 5and 7.apply rated voltage and check whether relay restrains. this indicates the relay non-operations,when two supply are in anti-phase.

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Relay Testing Procedure

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