Toshiba GR200 Series Instruction Manual page 57

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Element characteristic in distance relay

The distance protection function has six measurement zones; it is possible to identify the fault

point using these zones. This function has ZS elements to determine phase-to-phase faults and

ZG elements to determine single-phase-earth faults.

This distance protection function can be selected to have either a Mho characteristic

(Mho) or a Quadrilateral characteristic (Quad) for both ZS and ZG. Each of the measuring

zones in this function has a directional characteristic.

Note: The Asterisk (*) in the setting is used to show the zone number in ZS/ZG (either

"1", "1X", "2", "3", "4", or "5"). The numbering and application of ZS/ZG are

described later.

Common characteristic of ZS and ZG

The distance protection function has a Mho characteristic (Mho) element and a Quadrilateral

characteristic (Quad) element and either the Mho characteristic or the Quad characteristic is

selected by the scheme switches [ZS-Chara] and [ZG-Chara].

Note: The complete elements and their characteristics, ZS and ZG are based on the

scheme switches [ZS-Chara] and [ZG-Chara].

Mho characteristic

(i)-1-1 Conventional Mho characteristic

Figure 2.1-11(a) and (b) show Z*S and Z*G with the Mho characteristic. The Z*S can

be set using the settings [Z*S-Mho.Reach] and [Z*S-Mho.Angle].

The blinder positions (left line and right line) are defined by the resistance and the

angle in the Figure 2.1-11; they are set using settings [Z*S-R.Reach] and [Z*S-

R.Angle]. The blinders are aligned symmetrically with the X-coordinate. Scheme

switches [Z*S-MhoR.EN] should be set On to enable the blinders.

6F2S1915 (0.46)

GRZ200 (Soft 031 & 032)