Toshiba GR200 Series Instruction Manual page 1159

Line differential protection ied

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Remote DIFL/DIFGL trip using communication scheme

Remote differential protection (RDIF†) is designed to operate the DIFL/DIFLG relay operation

remotely when a failure occurs on communication channels. If a relay is able to make the DIFL

or DIFGL computation during the communication failure, it is preferable that other relays can

have the computation result during the communication failure; this allows issuing trip

commands on the enter lines by the DIFL/DIFGL relay during the communication failure. Note

the user is required to program transmitter and receiver logics with the PLC editor at

respective terminals with communication application (COMM_APPL‡).

†Note: For more information about the remote trip protection, see

application: DIFL applied to three-terminal line

‡Note: For the operation, use Wide frame structure (N=3) by setting [CH*_COM_WIDTH]

§Note: Set On for the [INTCOM] in order that the scheme does not to operate incorrectly.

Transmitter and receiver schemes

Figure 2.7-1 shows that the local relay sends 'DIFL' operation signal for opposite remote

Terminal G. Relay1 at the terminal G receives the 'DIFL' operation signal; Relay1 can use the

receiving signals to issue trip commands if the Relay1 cannot make DIFL computation itself.

Both Relays at Terminals G and H can receive the 'DIFL' operation signals. Figure 2.7-1

illustrates that the DIFL signals are transferred for the remote relays in IEEE C37.94

communication format. Table 7.4-6 shows the format and connections at Terminal J.

Figure 7.4-12 Remote trip scheme in the three-terminal configuration

Chapter Relay application: Communication application

DIFL-A,DIFL-B, DIFL-C

Chapter Relay

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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