124
Two step time delayed phase overcurrent
protection (TOC2)
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Prepare the terminal for test as outlined in section “Preparing for test” in this chapter.
Ensure that the maximum continuos current of a terminal does not exceed four times its
rated value, if the measurement od the operating characteristics runs under constant
voltage conditions.
To verify the settings the following fault type should be tested:
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One for a phase-to-earth fault
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The operate time shall be tLow+operate time of the low set stage.
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If I>Low is set higher than I>Inv, check that there is no trip signal
TOC2-TRLS when the current is less than I>Low.
Summary of Contents for REL 531
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 ...
