Toshiba GRL100-701B, Инструкция по эксплуатации, Страница: 269 / 473

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6 F 2 S 0 8 5 0
Synchronism check element SYN1
•
Press 4 (=Logic circuit) on the "Test" screen to display the "Logic circuit" screen.
•
Enter a signal number for the TermA line to be observed at monitoring jack A and press the
ENTER key.
•
Apply a three-phase rated voltage and a single-phase rated voltage as shown in Figure
6.5.1.12.
Voltage check:
•
Set the three-phase voltage to any value over the SY1OV setting. (The default setting of
SY1OV is 51V.)
Whilst keeping Vr in-phase with Va, lower the single-phase voltage Vr from the rated value.
Measure the voltage at which the element operates. Check that the measured voltage is within
±
5% of the SY1UV setting.
•
Further lower Vr and measure the voltage at which the element resets. Check that the
measured voltage is within
±
5% of the SY1OV setting.
Phase angle check:
•
Set Va and Vr to any value between the SY1OV and SY1UV settings keeping Va in-phase
with Vr. Then the SYN1 element operates.
•
Shift the angle of Vr away from that of Va, and measure the angle at which the element resets.
•
Check that the measured angle is within
±
5° of the SY1
θ
setting. (The default setting of SY1
θ
is 30°.)
•
Change Va and Vr, and repeat the above.
Synchronism check element SYN2
•
Apply single-phase rated voltage to terminals 17 and 18 as shown with broken lines in Figure
6.5.1.12 and set the scheme switch "3PH-VT" to "Line". The test can be performed taking the
same steps as testing SYN1.
6.5.1.12 Current Change Detection Elements OCD, OCD1 and EFD
The test circuit is shown in Figure 6.5.1.13.
Single-phase
current
source
A
TB1
DC
voltmeter
TB4 -A16
-A17
E
GRL100
DC
power
supply
+
−
Monitoring
jack
A
0V
-1
-2
-7
-8
(*)
(*) In case of testing EFD.
Figure 6.5.1.13 Testing Current Change Detection Element
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