Toshiba GRZ100 B Series, Instruction Manual

Page: 228 / 447

⎯
227
⎯
6 F 2 S 0 8 4 6
6.5 Function Test
CAUTION
The function test may cause the output relays to operate including the tripping output relays.
Therefore, the test must be performed with tripping circuits disconnected.
6.5.1 Measuring Element
Measuring element characteristics are realized by 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.
/ 2 L o g 1 / 2
T e r m ( 0 - 0 7 1 ) ： 0
T e r m ( 0 - 0 7 1 ) ： 0
i c c i r c u i t
A
B 3
3
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" when measured by
an instrument with 10k
Ω
input impedance, and less than 0.1V for logic level "0".
CAUTION
•
Use test equipment with more than 1 k
Ω
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 a representative phase. A-phase and AB-phase
elements are selected for the earth fault element and phase fault element respectively hereafter.