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Figure 2.36-1 shows two IEDs arrangement when two IEDs connect with a channel. In the
arrangement, the user can select IED_G as the master and should set 1 for the scheme switch
[TERM_ID], whereas the user should select another IED_H as the slave and set 2 for the
scheme switch [TERM_ID]. The user should also set 2Term for the scheme switch
[TERM_TOPOLOGY] in both IEDs.
Figure 2.36-1 Two IEDs and setup for a single channel
2Term-Dual mode
When two IEDs are linked with dual channels, the user set 2Term-Dual for the scheme switch
[TERM_TOPOLOGY] respectively, as shown in Figure 2.36-2. Note that IEDs will have
incorrect relay computations and improper communication, if the IEDs do not have the same
data communication interface. Thus, the user shall set either Normal or Wide for the scheme
switches [CH1_COM_WIDTH] and [CH2_COM_WIDTH] at both IEDs.
Figure 2.36-2 Two IEDs and setup for dual channels
3Term mode
Figure 2.36-3 shows three IEDs arrangement; the three IEDs are linked with three channels.
Based on the IED’s property, IED_G can run as the master while IED_H and IED_R can run
as the slave. Thus, the user should set 1 for the scheme switch [TERM_ID] in IED_G. On the
other hand, set 2 and 3 for the IED_H’s [TERM_ID] and the IED_R’s [TERM_ID], respectively;
then, the user can set 3Term for the scheme switch [TERM_TOPOLOGY] at three IEDs. Either
Normal or Wide shall be set for the [CH*_COM_WIDTH] at all IEDs unconditionally in order
that the communication interface between IEDs are united.
[TERM_TOPOLOGY] =2Term-Dual
[TERM_TOPOLOGY] =2Term-Dual
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