Toshiba GR200 Series Instruction Manual page 131

Centralized busbar protection ied

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Operation of EFP-trip

Based on the placement of CT and CB, the EFP function is grouped into three modes: (i) EFP

Zone-trip (Mode 1), (ii) EFP Transfer-trip (Mode 2), and (iii) Non EFP-trip. Using scheme

switches [EFP-EN_CH*], the user can select either On-Zone (Mode 1)/ On-TR (Mode 2)/ Off.

Operation of EFP Zone-trip (Mode 1)

Suppose a CB (CB-A) is placed at the line side and the bus-bar is operated while CB-A is in the

open position. Figure 2.5-1 shows a case that a fault occurs between the CB-A and the CT, so

that the DIF relay does not operate. To solve this problem, the EFP function is effective. Figure

2.5-2 illustrates two CBs (CB-B in Zone A and CBC used to connect the bus-bars) are tripped

to open by the EFP Zone-trip operation. For the operation in Mode1, set On-Zone for the

settings [EFP-EN_CH*] in respective CHs.

Figure 2.5-1 Fault occurrence and current flow before

Figure 2.5-2 Tripping CB-B and CBC by EFP

6F2S1931 (0.20)

CBC Coupler-CB

Centralized GRB200

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

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