Toshiba GRL100-701B Instruction Manual page 269

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 V r in-phase with V a , lower the single-phase voltage V r 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 V a and V r to any value between the SY1OV and SY1UV settings keeping V a in-phase
with V r . Then the SYN1 element operates.
• Shift the angle of V r away from that of V a , 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 V a and V r , 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
+
DC
power
−
supply
DC
voltmeter
Figure 6.5.1.13 Testing Current Change Detection Element
TB1
A
(*)
TB4 -A16
(*) In case of testing EFD.
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6 F 2 S 0 8 5 0
GRL100
-1
-2
-7
A
-8
Monitoring
jack
0V
-A17
E