Toshiba GR200 Series Instruction Manual page 171

Line differential protection ied

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Tips to set the main/remote backup relays

To make the coordination between the main (primary) relay and backup relays on lines, using

setting and a delay timer setting

that respective reaches and delays in the distance protection (ZS/ZG) functions result in the

coordination between the main (primary) relay and backup relays on the lines.

Reach in the forward

Figure 2.10-53 Zones and time coordination between terminals

Note: For the ZS elements, the 'reach' setting is possible using the settings [Z*S-

Mho.Reach] and [Z*S-Mho.Angle] for the Mho characteristic. If the Quad

characteristic is applied, the value of the reach setting is projected on the

reactance-axis.

Note: To realize the coordination time interval (CTI), the user can apply delay times for

the operation in respective elements. For the ZS elements, for example, use the

settings [TZ*S].

Note: 'Zone1', 'zone2', and 'zone3' are zones seen by the ZS/ZG relays looking into the

forward. On the other hand, 'zone4' and 'zone5' are zones seen by the ZS/ZG relays

looking into the backward. The locations of the ZS/ZG relays are shown with

parentheses. That is, the zone1

Setting for the primary line (Zone1)

The zone1 of the ZS/ZG function can be used as a backup relay substituted into the DIF (main)

can resolve the problems. Figure 2.10-53 exemplifies

, which is operated at the location X, trips 'circuit

6F2S1914 (0.49)

Reach in the forward

GRL200 (Soft 033 & 037)

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