PRIM AR Y TESTING CUR R E N T S EN S ORS
1VLG5 00 0 17 C 21
Step 2/5
Move two neighboring circuit breakers into the service position and close them.
Default values of overcurrent, earth fault and unbalance protection functions can op-
erate the circuit breaker during primary injection. Disable all related protection func-
tions in the protection relay or disconnect the tripping coil (MO) from the negative
potential of power supply in the low voltage compartment before primary injection to avoid
unwanted tripping of the circuit breaker.
Step 3/5
In the cable compartments, connect the injection device to the cable sealing end of the same
phase.
Figure 31 Primary test setup for current sensors when busbars are installed
Step 4/5
Inject a current equal to the application nominal current or equal to the maximal current sup-
ported by the primary testing device if the application nominal current is out of the device
setting range.
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