Toshiba GR200 Series Instruction Manual page 538

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Communication test

Local test (Local-test)

When setting [Local-test]=On, '1' is set for Local test bit of SCOM4 frame so that zero-ampere

control is executed at the remote end. The zero-ampere control is the one of test functions that

a local IED can treat the remote current data as zero.

a. IE EE C37.94 frame

For example, during the test, suppose that setting [Local-test]=Off (as a default condition);

and CB and DSs are open at the local end. Remote CB can be tripped by the remote IED, if

currents are injected at the local IED while the communication is established between IEDs.

That is, the user needs to set [Local-test]=On for the test. Note that Test LED is lit while the

setting is On.

Local loop test (Loop-test)

Suppose that GRL200s at local and remote ends are connected with TX and RX fiber optical

cables. If setting [Loop-test]=On, the user can have loop-back test at the local IED by disabling

sampling synchronization supervision function. Note other supervision functions are not

disabled, but there are following limitations during the test.

Sensitivity of DIF and DIFG elements becomes double. (If the injection of test current at

one terminal is 1A, the differential current Id becomes 2A.)

"Test LED" is On ("In service LED" is Off.)

Open test (OPEN 1/OPEN 2)

If communication channels between IEDs should not be connected for testing, the user can cut

the channel when On is set setting [OPEN *]. For example, when setting [OPEN 1]=On, the

communication channel#1 will be cut at the local end. The default setting is Off.

Figure 2.37-7 Location of local test bit

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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