Toshiba GR200 Series Instruction Manual page 526

Line differential protection ied

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Resynchronization

Even when any of the IEDs is taken out-of-service, the other IEDs except the out-of-service

IEDs can operate the differential protection function, in which case the logic of out-of-service

detection is provided.

As for the operation of two IEDs on a line, suppose an IED is taken out-of-service, another

IED can continue to operate the differential protection function with the local current data. It

is required that another IED is neither the master nor the slave.

On the other hand, when an IED on a three-terminal line is taken out-of-service,

synchronized sampling is established between the remaining two IEDs; hence, the two IEDs

keeps operating the differential protection function.

Note: If the master IED is taken out-of-service, one of the slave IEDs takes over the

master IED synchronized sampling function and enables the differential

protection function operates between the remaining IEDs. If the slave IED is

taken out-of-service, the master and another slave IED can maintain operating

the differential protection function.

Topology of telecommunication

The DIF_COMM function has two topologies for telecommunication network: a peer-to-peer

connection and a star connection. The peer-to-peer connection is used in a two-terminal line

(dual mode), whereas the star connection is used in a three-terminal line (star mode).

When an application is applied for a two-terminal line, the application may operate in the dual

mode between the IEDs. As illustrated in Figure 2.36-9, each IED is connected with two

bidirectional channels. The second channel provides a redundancy as a backup line with

automatic switchover, if the first channel is lost. As a result, it's possible to continue sampling

and calculating simultaneously at each other. For the dual mode, the user should set the

scheme switch [TERM_TOPOLOGY] =2Term-Dual.

Figure 2.36-9 Dual communication mode

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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