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PR IM AR Y T ES T IN G
4.3.3
Voltage sensor installed on busbars
Step 1/8
Verify sensor parameters set in the protection relay with the sensor rating plates placed on
the circuit breaker door.
Figure 45: Example of a voltage sensor label
On the protection relay LHMI go to -> Main Menu/Configuration/Analog inputs/Voltage (3U,
VT)
– Primary voltage = nominal voltage of the network
– VT connection = Wye (star connection)
– Amplitude Corr A = sensor rating plate, phase A
– Amplitude Corr B = sensor rating plate, phase B
– Amplitude Corr C = sensor rating plate, phase C
– Division ration = 10 000
– Voltage input type = CVD sensor
– 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 46: Voltage sensor parameters
Step 2/8
Isolate the whole bus section. All circuit breakers belong to the relative busbar section move
into the test position.
Step 3/8
Select one outgoing switchgear panel in the section to apply voltage on the main bus. Re-
move the circuit breaker out of the switchgear panel and close the earthing switch
1 VLG 500 0 17 C
VO LTAG E SE NSO R S
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