Toshiba GR200 Series Instruction Manual page 173

Line differential protection ied

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Figure 2.10-54 Setting zone2 when line BC is shorter than line AB

Tips: For the reach and delay settings about the CTI to the zone 2, the user is generally

required to check the selectivity that is influenced with the slowest timer of the

following protection relays: (1) Busbar, transformer, and breaker-failure relays at

the remote end and (2) line protection relay on the adjacent lines.

Setting for far adjacent lines (Zone3 serviced as a backup relay)

will be served as a backup relay for far adjacent lines, if the coordination could be

satisfied with the zone2

remote-end of the longest adjacent line whenever possible. Note that the effect of fault infeed

should be taken into account at the remote busbars. If the line-configuration is similar to the

one in Figure 2.10-53, the user is only required to think of the coordination between the

settings TZ3

Figure 2.10-55 Zone3 setting when the line BC is shorter than the line BE

Figure 2.10-55 illustrates that the adjacent line BC is shorter than the adjacent line BE.

For the CTI between the adjacent lines BC and BE, if it is difficult to achieve the coordination

; then, the user should set the reach of the zone3

6F2S1914 (0.49)

that can cover the

GRL200 (Soft 033 & 037)

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