Toshiba GRT100 Series, Instruction Manual

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6 F 2 S 0 7 8 9
6.5 Function Test
6.5.1 Measuring Element
Measuring element characteristics are realized by the software, so it is possible to verify the
overall characteristics by checking representative points.
Operation of the element under test is observed by the binary output signal at monitoring jacks A
or B or by the LED indications above the jacks. In any case, the signal number corresponding to
each element output must be set on the "Logic circuit" screen of the "Test" sub-menu.
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T e r m ( 0 - 3 3 3 ) ： 1
T e r m ( 0 - 3 3 3 ) ： 8 4
i c c i r c u i t
A
B
When a signal number is entered for the TermA line, the signal is observed at monitoring jack A
and when entered for the TermB line, observed at monitoring jack B.
Note:
The voltage level at the monitoring jacks is +15V

3V for logic level "1" and less than 0.1V
for logic level "0".
CAUTION

Use the testing equipment with more than 1k

of internal impedance when observing the
output signal at the monitoring jacks.

Do not apply an external voltage to the monitoring jacks.
In case of a three-phase element, it is enough to test for a representative phase. A-phase element
is selected hereafter.
6.5.1.1 Current differential element DIF
The current differential element is checked on the following items

Operating current value

Percentage restraining characteristic

Operating time
Note:
Set all the CT ratio matching settings (kct1 to kct3) to “1” and phase angle matching settings
(d1 to d3) to “0” in the testing described in 6.5.1.1 to 6.5.1.4, because the operating value
depends on the settings.
Operating current value
Minimum operating current value is checked by simulating a one-end infeed. Figure 6.5.1 shows
a testing circuit simulating an infeed from a primary winding.