Simplified Logic Diagrams - ABB Relion 670 Series Technical Reference Manual

Line differential protection ansi

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1MRK505222-UUS C

Technical reference manual

The reverse directional characteristic is equal to the forward characteristic rotated by

180 degrees.

Simplified logic diagrams

Distance protection zones

The design of distance protection zones are presented for all measuring loops: phase-to-

ground as well as phase-to-phase.

Phase-to-ground related signals are designated by AG, BG and CG. The phase-to-

phase signals are designated by AB, BC and CA.

Fulfillment of two different measuring conditions is necessary to obtain the one logical

signal for each separate measuring loop:

Zone measuring condition, which follows the operating equations described above.

Group functional input signal (PHSEL), as presented in figure 94.

Two types of function block, ZMCPDIS (21) and ZMCAPDIS (21), are used in the

IED. ZMCPDIS (21) is used for zone 1 and ZMCAPDIS (21) for zone 2 - 5.

The PHSEL input signal represents a connection of six different integer values from

the phase selection function within the IED, which are converted within the zone

measuring function into corresponding boolean expressions for each condition

separately. It is connected to Phase selection with load enchroachment, quadrilateral

characteristic (FDPSPDIS, 21) function output PHSELZ.

The internal input signal DIRCND is used to give condition for directionality for the

distance measuring zones. The signal contains binary coded information for both

forward and reverse direction. The zone measurement function filter out the relevant

signals on the STDIR input depending on the setting of OperationDir. It must be

configured to the STDIR output on Directional impedance quadrilateral, including

series compensation (ZDSRDIR, 21D) function.

Impedance protection

Relion red670