PRIM AR Y TESTING CUR R E N T S EN S ORS
1VLG5 00 0 17 C 27
Step 2/7
Move the circuit breaker into the service position and close it.
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 the primary injection to
avoid unwanted tripping of the circuit breaker.
Step 3/7
Remove the Overpressure relief flap from the busbar compartment to get access for one end
of the primary injection test set. If Ith limiters are installed, make sure they will not trip your
circuit breaker, for example, by disconnecting them from the tripping circuit.
Step 4/7
In the cable compartment, connect the second end of the primary injection test set to the ca-
ble sealing end and the busbar compartment to the branch conductor of the same phase. See
the picture below.
Figure 39: Test setup for current sensors when busbars are not installed
Step 5/7
Inject 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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