ABB Relion 670 Series Technical Reference Manual page 469

Line differential protection ansi

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1MRK505222-UUS C

Technical reference manual

If a phase current is larger than the set operating current the signal from the comparator

for this phase is activated. This signal will, in combination with the release signal from

line disconnection (RELEASE input), activate the timer for the TRIP signal. If the fault

current remains during the timer delay t, the TRIP output signal is activated. The

function can be blocked by activation of the BLOCK input.

STUB PROTECTION FUNCTION

ANSI05000731 V1 EN

Simplified logic diagram for Stub protection (50STB)

Function block

STBPTOC (50STB)

ANSI05000678-2-en.vsd

ANSI05000678 V2 EN

STBPTOC (50STB) function block

Current protection

en05000731_ansi.vsd

Relion red670