Toshiba GR200 Series Instruction Manual page 1149

Line differential protection ied

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PLC setting samples

Tele-protection scheme using DISCAR and DEFCAR commands

The distance carrier command protection (DISCAR†) or the directional earth fault command

protection (DEFCAR†) can realize permissible transfer tripping (or blocking remote tripping).

Between IEDs at the local and remote terminals, the signals generated in the DISCAR and

DEFCAR functions can be transmitted using the sub-communication bits (COM1, COM3‡, and

COM4‡) of the transmission control function (DIF_COMM), when the user has PLC

connections in the DISCAR, DEFCAR, DIF_COMM functions at the both terminals. Note that

this tele-protection scheme is not programmed for the operation in the Normal (N=1) frame.

At both the terminals, the user has to make the transmitter and receiver tele-protection logic

using the PLC editor.

†Note: For more information about the tele-protection, see the DISCAR and DEFCAR

functions in

‡Note: The COM3 and COM4 bits are laid out in Wide frame structure (N=3) when the

DIF_COMM function has setting [CH*_COM_WIDTH] = Wide.

§Note: Other transfer tripping can be achieved using the direct transfer trip (DTT)

function, but the DTT scheme makes tripping the CB unconditionally if a trip

command is generated in trip circuits (TRC) at any terminals. The user is

recommended to set On for the [INTCOM] in case that the scheme does not operate

Transmitter tele-protection logic

The DISCAR and DEFCAR functions generate carrier commands for the tele-protection; their

commands can be sent for the remote terminal, when the user makes the transmitter logic

with the COMM_APPL function. Table 7.4-1 (and Figure 7.4-1) shows the sample PLC logic,

when the IED has VCT12B arranged for the 1CB system. Table 7.4-2 (Figure 7.4-2) shows the

other PLC logic, when the IED has a VCT11B arranged for the 1.5CB system. Sample PLC

logic for the sub-communication channel (COM1-1-S) is illustrated in Figure 7.4-5; the user is

required to make the similar PLC logics for the other sub-communication channels (i.e., COM1-

2-S, COM3-1-S, etc.) at the local and the remote terminals.

Chapter Relay application

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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