57
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.
5.7.2.
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.
Feeder Protection Relay
Operator's Manual - ANSI Version
REF 610
REF 610
1MRS755539
