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Electrical Testing Report

This document summarizes the testing and calibration of protection devices on an 11kV switchboard panel. Measurement checks of current transformers, voltage transformers, and differential protection were performed within acceptable tolerances. Overcurrent, negative phase sequence, and overload protections were also tested at various settings, with all devices operating within specified times.

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Amaresh Nayak
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107 views5 pages

Electrical Testing Report

This document summarizes the testing and calibration of protection devices on an 11kV switchboard panel. Measurement checks of current transformers, voltage transformers, and differential protection were performed within acceptable tolerances. Overcurrent, negative phase sequence, and overload protections were also tested at various settings, with all devices operating within specified times.

Uploaded by

Amaresh Nayak
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Date:09-11-2018

1.0 Name Plate Details:


Location : 11 KV Switch Board
Make. : NR
Panel Name & No : 20BBA08, CPNDW PUMP-A
Model No : RCS9627 CN
SL No : 7669111105001
CT Ratio : 300/5A & 300/5A
CBCT RATIO : 100/5A
PT Ratio : 11 KV/110V

2.0 Measurement Function Check: -


CT MEASUREMENT
Injected current(A) Injected Measurement Measurement current(A)
Phase
side-1 current(A) side-2 current(A) side-1 side-1
R 5 5 4.97 4.98
Y 5 5 4.97 4.98
B 5 5 4.98 4.99

CBCT MEASUREMENT
Phase Injected current(A) Measurement current(A)
N 5 5.01

PT MEASUREMENT
Phase Injected Voltage(V) Measurement Voltage (Vpn)
R 63.51 63.47
Y 63.51 63.46
B 63.51 63.47

APPROVED APPROVED
TESTED BY WITNESSED BY WITNESSED BY
BY BY
SIGNATURE SIGINATURE SIGINATURE
NAME NAME NAME
DATE DATE DATE
LAXMI ASSOCIATE STEAG TSPL
1
Date:09-11-2018

3.0 DIFFERENTIAL PROTECTION

3.1 Pickup Test HV side: SET CURRENT: - 0.72A

Phase Set Current (A) Opt. Current (A) Operating Time (ms)
R-Y-B 0.72 0.72 45

3.2 Pickup Test LV side: SET CURRENT: - 1.08A

Phase Set Current (A) Opt. Current (A) Operating Time (ms)
R-Y-B 0.72 0.72 56

3.3 Stability Test:

Injected current(A) Injected current(A)


Phase Id Value Ib Value Relay Status
side-1 side-2
R 5∠0⁰ 5∠180⁰
Y 5∠-120⁰ 5∠60⁰ 0 5 Stable
B 5∠+120⁰ 5∠360⁰
R 5∠0⁰ 5∠0⁰
Y 5∠-120⁰ 5∠-120⁰ 1.97 5 Tripped
B 5∠+120⁰ 5∠+120⁰

3.4 Slope Test:

0.5*In Set Slope=0.40


Injected current(A) Injected current(A)
Phase Id1 Ib1 Relay Status
side-1 side-2
R 2.5∠0⁰ 3.437∠180⁰
Y 2.5∠-120⁰ 3.437∠60⁰ 0.40 1.2 Relay Operated
B 2.5∠+120⁰ 3.437∠300⁰

APPROVED APPROVED
TESTED BY WITNESSED BY WITNESSED BY
BY BY
SIGNATURE SIGINATURE SIGINATURE
NAME NAME NAME
DATE DATE DATE
LAXMI ASSOCIATE STEAG TSPL
2
Date:09-11-2018

1*In
Injected current(A) Injected current(A)
Phase Id2 Ib2 Relay Status
side-1 side-2
R 5∠0⁰ 7.175∠180⁰
Y 5∠-120⁰ 7.175∠60⁰ 0.65 1.836 Relay Operated
B 5∠+120⁰ 7.175∠300⁰

SLOPE =Id2-Id1/Ib2-Ib1 = (0.65-0.40) / (1.836-1.2)


=39.30%

3.5 Differential High Stage:


SET CURRENT: -14.4 A
Phase Set Current (A) Opt. Current (A) Operating Time (ms)
R-Y-B 9.6 9.61 44

4.0 Over Current:


Stage: -1 SET CURRENT: - 24A SET TIME: - 0 Sec
Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (m Sec)
R 24 24 0 43
Y 24 24 0 43
B 24 24 0 43

Stage: -2 SET CURRENT: - 18.7A SET TIME: - 0.05 Sec


Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (m Sec)
R 18.7 18.7 0.05 85
Y 18.7 18.7 0.05 85
B 18.7 18.7 0.05 85

Stage: -3 SET CURRENT: - 3.2A SET TIME: - 18 Sec


Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (Sec)
R 3.2 3.2 18 18.01
Y 3.2 3.2 18 18.01
B 3.2 3.2 18 18.01

APPROVED APPROVED
TESTED BY WITNESSED BY WITNESSED BY
BY BY
SIGNATURE SIGINATURE SIGINATURE
NAME NAME NAME
DATE DATE DATE
LAXMI ASSOCIATE STEAG TSPL
3
Date:09-11-2018

5.0 Negative Phase Sequence:


Stage: -1 SET CURRENT: - 2.4A SET TIME: - 0.7 Sec
Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (Sec)
R 2.4 2.4 0.7 0.735
Y 2.4 2.4 0.7 0.735
B 2.4 2.4 0.7 0.735

Stage: -2 SET CURRENT: - 1.2A SET TIME: - 1.6 Sec


Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (Sec)
R 1.2 1.2 1.6 1.63
Y 1.2 1.2 1.6 1.63
B 1.2 1.2 1.6 1.63

6.0 Over Load Current:


SET CURRENT: - 2.8A SET TIME: - 15 Sec
Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (Sec)
R 2.8 2.8 15 3.02
Y 2.8 2.8 15 3.02
B 2.8 2.8 15 3.02

7.0 Thermal Overload:


SET CURRENT: - 6A
Phase Set Current (A) Injected Current (A) Alarm Opt. Time (Sec)
R 6 6 80% 15.02
Y 6 6 80% 15.02
B 6 6 80% 15.02

8.0 Residual Over Current:


SET CURRENT: - 3A SET TIME: - 50 m Sec
Phase Set Current (A) Injected Current (A) Set time (Sec) Opt. Time (m Sec)
N 3 3 0.05 84

APPROVED APPROVED
TESTED BY WITNESSED BY WITNESSED BY
BY BY
SIGNATURE SIGINATURE SIGINATURE
NAME NAME NAME
DATE DATE DATE
LAXMI ASSOCIATE STEAG TSPL
4
Date:09-11-2018

9.0 Under Voltage:


SET VOLTAGE: - 50V SET TIME: - 9.0 Sec
Phase Set Voltage (VPP) Injected Voltage (VPN) Set time (Sec) Opt. Time (Sec)
R 50 28.5 9 9.05
Y 50 28.5 9 9.05
B 50 28.5 9 9.05

10. Remarks: -

APPROVED APPROVED
TESTED BY WITNESSED BY WITNESSED BY
BY BY
SIGNATURE SIGINATURE SIGINATURE
NAME NAME NAME
DATE DATE DATE
LAXMI ASSOCIATE STEAG TSPL
5

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