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CU R R E N T S EN SO R S
4.2.4
Non-installed busbars in the switchgear panel
This testing method includes the influence of application, such as the circuit breaker or con-
tactor, which are used to make an electrical circuit between the cable and busbar compart-
ments. The abovementioned testing method is preferred by switchgear factories for the pri-
mary testing of current sensors in a workshop.
If high voltage cables are terminated to switchgear panel, check the installation is
dead.
Protect against any other live parts.
Step 1/7
Verify the sensor parameters set in the protection relay with the sensor rating plates placed
on the circuit breaker door.
Figure 37: Example of a current sensor label
On the protection relay LHMI go to -> Main Menu/Configuration/Analog inputs/
Current (3I, CT)
– Primary current = Application nominal current
– Amplitude Corr A = sensor rating plate, phase A
– Amplitude Corr B = sensor rating plate, phase B
– Amplitude Corr C = sensor rating plate, phase C
– Nominal current = Primary current
– Rated secondary Val = Rated secondary value in mV/Hz
– Angle Corr A = sensor rating plate, phase A
– Angle Corr B = sensor rating plate, phase B
– Angle Corr C = sensor rating plate, phase C
Figure 38: Current sensor parameters
2 6
PR IM AR Y T EST IN G
1 VLG 5000 17 C
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