ABB REL 551 2.3 Series - Page 94

88
Definite and inverse time-delayed
residual overcurrent protection (TEF)
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Prepare the terminal for verification of settings as outlined in section “Preparing for
test” in this chapter.
Normally, the test of the earth-fault overcurrent protection is made in conjunction with
the testing of the distance protection functions, using the same multiphase test-set. Ob-
serve that the polarising voltage is equal to -3Uo.
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Values of the logical signals belonging to the time delayed residual
overcurrent protection are available under menu tree:
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The IN> Dir function activates the TEF--STFW output.
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The function activates the TEF--STRV output.