Basic Characteristics; Setting Guidelines - ABB RELION 670 SERIES Applications Manual

Line distance protection

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Impedance protection

Operating characteristic

IEC09000224 V1 EN

Impedance plane with Power swing detection operating characteristic

and impedance locus at power swing

Basic characteristics

Power swing detection function (ZMRPSB, 78) detects reliably power swings with

periodic time of swinging as low as 200 ms (which means slip frequency as high as 10%

of the rated frequency on the 50 Hz basis). It detects the swings under normal system

operate conditions as well as during dead time of a single-pole automatic reclosing cycle.

ZMRPSB (78) function is able to secure selective operation for internal faults during

power. The operation of the distance protection function remains stable for external faults

during the power swing condition, even with the swing (electrical) centre located on the

protected power line.

The operating characteristic of the ZMRPSB (78) function is easily adjustable to the

selected impedance operating characteristics of the corresponding controlled distance

protection zones as well as to the maximum possible load conditions of the protected

power lines. See the corresponding description in "Technical reference manual" for the

Setting guidelines are prepared in the form of a setting example for the protected power

line as part of a two-machine system presented in figure 226.

Impedance locus at

IEC09000224_1_en.vsd

Line distance protection REL670 2.2 ANSI

1MRK 506 369-UUS -

Application manual