Testing Of The Ground-Fault Protection - ABB REF 610 Operator's Manual

1MRS755539
5.7.2.
Feeder Protection Relay
Operator's Manual - ANSI Version
When calculating the current to be injected into the phase current energizing inputs,
the calculation should be done on the basis of the following:
The rated current, 1 A or 5 A, of the relay energizing input to be tested
*
This gives the current to be injected during the test as follows:
Injected current (A) = 2.5 x50P-1 x Rated current of the energizing input
*
To perform the test, inject the current in all three phase current energizing inputs.
The output contacts, to which the trip signal is routed from the short-circuit
protection function, should be activated on the expiration of the set operate time of
element 50P-1.

Testing of the ground-fault protection

When calculating the current to be injected into the ground-fault current energizing
input, the calculation should be done on the basis of the following:
The rated current, 0.2 A, 1 A or 5 A, of the relay energizing input to be tested
*
This gives the current to be injected during the test as follows:
Injected current (A) = 2.5 x 51N x Rated current of energizing input
*
To perform the test, inject the current in the ground-fault current energizing input.
The output contacts, to which the trip signal has been routed from the ground-fault
protection element, should be activated on the expiration of the set operate time of
element 51N.
REF 610 REF 610
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