Toshiba GR200 Series Instruction Manual page 26

Line differential protection ied

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Figure 1.1-2(b) exemplifies that both the forward line and the busbar are protected using

a CT. Once a fault occurs between the CT and the CB

operate, but the relay Ry

should keep in mind that a blind spot never exits in the power system for designing the

: Current transformer (which is connected with a relay)

: Circuit Breaker (which is located at M)

: Protection relay (which is located at V)

: Protection area by line protection scheme

: Protection area by busbar protection scheme

Figure 1.1-1 Two protection schemes for line and busbar

(a)Line and Busbar protected relays with two CTs isolated

Figure 1.1-2 Protection schemes and the location of the CB

As mentioned earlier, shortening the fault duration is realized by the speedy operation of the

relay; it is achieved by the high speed signal processing module. However, we have to note that

the operating time of the CB is slower comparted with the one of the processing module.

Additionally, the propagation delay of the communion should also be considered when the

carrier command protection function is considered for the protection.

for the busbar may fail to operate to clear the fault. That is, we

, the relay Ry

(b)Line and Busbar protected relays with a CT

6F2S1914 (0.49)

for the forward line can

GRL200 (Soft 033 & 037)

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