35
Checking the CT and VT circuits
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Check that the wiring is in strict accordance with the supplied wiring diagram.
Test the circuitry. The following tests are recommended:
•
Polarity check.
•
CT circuit current measurement (primary injection test).
•
Earthing check.
The polarity check verifies the integrity of the circuits and the phase relationship. The
check should be performed as close as possible to the terminal.
The primary injection test verifies the CT ratio and the wiring all the way through from
the primary system to the terminal. Injection must be performed for each phase-to-neu-
tral circuit and each phase-to-phase pair. In each case currents in all phases and the neu-
tral line are measured.
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Summary of Contents for REL 551 2.3 Series
Page 16: ...10 Note signs KDSWHU 6DIHW LQIRUPDWLRQ ...
Page 44: ...38 Checking the binary I O circuits KDSWHU KHFNLQJ WKH H WHUQDO FLUFXLWU ...
Page 52: ...46 Checking the self supervision signals KDSWHU QHUJLVLQJ WKH WHUPLQDO ...
Page 140: ...134 Testing the interaction of the distance protection KDSWHU 7HVWLQJ WKH SURWHFWLRQ V VWHP ...
