Toshiba GR200 Series Instruction Manual page 43

Centralized busbar protection ied

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The user has to make the coordination between the setting [DIF**-Slope] and CT

characteristics operating in the busbar. As shown in Figure 2.1-9, the switch [CTSC**-EN]† is

provided for blocking the DIF relay operation by CTSC. The user can halt the blocking the DIF

operation by CTSC using the [CTSC**-EN]=Off. The switch can be also available to test the

ratio of DIF characteristic.

DIF Relay element

Setting [DIF**-I]

Detection of no change

Setting [DIF**-I]

Figure 2.1-9 Configuration to block the DIF relay operation by CTSC

†Note: Asterisks (**) in settings here represent the general terms of "Check zone

protection (CH)" and "Discriminating zone protection (DZ)".

Operating area

Slope ratio＝30%

Slope ratio＝15%

Operating area

6F2S1931 (0.20)

DIF relay operating signal without blocking by CTSC.

This signal can be used for testing.

DIFCH-A,B,C-TH

DIFZA-A,B,C-TH,

DIFZB-A,B,C-TH,

DIFZF-A,B,C-TH,

DIF relay operating signal

Centralized GRB200

(Soft: 030, 031, 032, 033, 034)

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