Toshiba GR200 Series Instruction Manual page 1155

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Transfer trip using DTT scheme

The direct transfer protection (DTT†) is designed to send a trip signal to the remote terminal

using the communication. This DTT scheme makes tripping CBs on the enter lines without

delaying; this operates together with communication application (COMM_APPL‡). The user is

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

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

application: Direct transfer protection

‡Note: COM1 bits are used, but the COM3 and others are also possible to use when Wide

frame structure (N=3) is selected by setting [CH*_COM_WIDTH] = Wide; see

Chapter Relay application: Communication application

§Note: Keep in mind that the DTT scheme makes tripping all CBs unconditionally if a

trip signal is generated at any terminals. 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 DTT can transfer a TRIP signal when entire CBs should be tripped,

because the TRIP signal is injected externally at Terminal J. The DTT scheme can transfer the

TRIP signal to remote terminals G and H; the remote terminals can trip their CBs.

Figure 7.4-7 External TRIP signal sending for remote ends

The local TRIP signal, which is injected via a binary input circuit (BI), is transferred in the

IEEE C37.94 communication format to Terminals G and H (Figure 7.4-8). On the other hand,

the local DTT1 function can trip the CB by the remote commands from Terminals G and H.

Table 7.4-5 shows the connections at Terminal J.

TRIP command

Local IED relay

TRIP command

Remote1 relay

Remote2 relay

6F2S1914 (0.49)

Chapter Relay

GRL200 (Soft 033 & 037)

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