ABB RELION REX640 Technical Manual page 1632

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Power quality measurement functions

If Phase mode is "Three Phase", the DIPST and INTST outputs are

activated when the voltage levels of all monitored phases, defined

with the parameter Phase supervision, drop below the Voltage Int set

setting value. An example for the detection principle of voltage

interruption for "Three Phase" when Phase supervision is "Ph A + B

+ C", and also the corresponding start signals when Phase mode is

"Single Phase", are as shown in the example for the detection of a

three-phase interruption.

Voltage swell set

Voltage dip set

Voltage Int set

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Detection of three-phase voltage interruption

The module measures voltage variation magnitude on each phase separately, that is,

there are phase-segregated outputs ST_A, ST_B and ST_C for voltage variation

indication. The configuration parameter Phase supervision defines which voltage

phase or phases are monitored. If a voltage phase is selected to be monitored, the

function assumes it to be connected to a voltage measurement channel. In other words,

if an unconnected phase is monitored, the function falsely detects a voltage

interruption in that phase.

The maximum magnitude and depth are defined as percentage values calculated from

the difference between the reference and the measured voltage. For example, a dip to

70 percent means that the minimum voltage dip magnitude variation is 70 percent of

the reference voltage amplitude.

A) Three phase mode

B) Single phase mode

1MRS759142 C

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