Operation Principle - ABB RES670 Technical Manual

Relion 670 series, phasor measurement unit

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Impedance protection

Operation principle

Power swing detection (ZMRPSB ,68) function comprises an inner and an outer

quadrilateral measurement characteristic with load encroachment, as shown in

Its principle of operation is based on the measurement of the time it takes for a power

swing transient impedance to pass through the impedance area between the outer and

the inner characteristics. Power swings are identified by transition times longer than a

transition time set on corresponding timers. The impedance measuring principle is the

same as that used for the distance protection zones. The impedance and the

characteristic passing times are measured in all three phases separately.

One-out-of-three or two-out-of-three operating modes can be selected according to the

specific system operating conditions.

ANSI05000175 V2 EN-US

Operating characteristic for ZMRPSB (68) function (setting parameters

The impedance measurement within ZMRPSB (68) function is performed by solving

and equation

applicable for phases B and C).

(Typical equations are for phase A, similar equations are

1MRK 511 408-UUS A

ANSI05000175-2-en.vsd

Phasor measurement unit RES670 2.2 ANSI

Technical manual

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