Though generally reliable, these devices require inspection to confirm connections are intact, and circuits are not improperly grounded. Relay systems protect high-voltage equipment and transmission lines to ensure safe,...
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Does relay protection require review - GDR Telecom Site Energy Systems [PDF]
Calibration testing is required to verify relay setting calibrations, configurations, and to identify any protection system defects. Functional testing is required to verify that the intent of the protection
When only one quantity is required to operate the relay, the test circuit are straight forward and there are very few problems. However, with two or more variable a.c. quantities, more complexity results,
The NERC Planning Standards for System Protection and Control also require the review of relay performance. Specifically, all protection system trip misoperations shall be analyzed for cause and
With microprocessor relays, the built-in, self-testing features can be expected to reveal most faults, but this alone does not meet regulatory requirements or cover the other components involved in the
Acceptance testing, commissioning, and startup will include control power tests, current transformer and potential transformer tests, and any other device testing associated with the protective relay. Routine
This test determines whether protective relays, fault pressure relays, reclosing relays, reclosing supervisory relays, and associated control schemes are operating properly.
SEL relays continually monitor and control power protection systems in addition to continuously monitoring their internal self-test diagnostics. Relay self-test diagnostics are capable of detecting
NERC Standard PRC-005-6 requires that protective devices are regularly maintained and tested.
Type tests are needed to prove that a protection relay meets the claimed specification and follows all relevant standards. Since the basic function of a protection relay is to correctly function under
Although failure of a protective relay system may have severe local or regional impacts, most protective relay systems are not required to operate to prove they are in working order.