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IEVref:448-12-10ID:
Language:enStatus: Standard
Term: principle failure
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Definition: an incorrect operation of protection caused by a mistake in the planning or design or setting or application of the protection

NOTE 1 – This kind of failure cannot normally be discovered by maintenance testing.

NOTE 2 – A failure attributable to software in a digital relay is a principle failure.

See figure 448-2.




Publication date:1995-12
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Internal notes:2012-12-18: Corrected for conformity with standard: source content transferred to definition field. JGO
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