Blocking - ABB RES670 Technical Manual

Relion 670 series, phasor measurement unit

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Voltage protection

ANSI10000040 V3 EN-US

Example for Definite Time Delay stage1 operation

Blocking

It is possible to block Two step undervoltage protection UV2PTUV (27) partially or

completely, by binary input signals or by parameter settings, where:

If the measured voltage level decreases below the setting of IntBlkStVal1, either the trip

output of step 1, or both the trip and the PICKUP outputs of step 1, are blocked. The

characteristic of the blocking is set by the IntBlkSel1 parameter. This internal blocking

can also be set to Disabled resulting in no voltage based blocking. Corresponding

settings and functionality are valid also for step 2.

In case of disconnection of the high voltage component the measured voltage will get

very low. The event will PICKUP both the under voltage function and the blocking

function, as seen in figure 94. The delay of the blocking function must be set less than

the time delay of under voltage function.

blocks all outputs

blocks all trip outputs of step 1

blocks all pickup and trip outputs related to step 1

blocks all trip outputs of step 2

blocks all pickup and trip outputs related to step 2

1MRK 511 408-UUS A

ANSI10000040-3-en.vsd

Phasor measurement unit RES670 2.2 ANSI

Technical manual

M15326-20 v8

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