Toshiba GRZ100 B Series, Instruction Manual

Page: 244 / 447

⎯
243
⎯
6 F 2 S 0 8 4 6
Connect a phase angle meter to the three-phase voltages taking the scheme switch [VT-RATE]
and [VTPHSEL] setting into consideration. The phase angle meter connection shown in Figure
6.5.1.7 is the case for the default settings, that is, [VT-RATE] and [VTPHSEL] are set to "PH/G"
and "A" respectively.
[VT-RATE] setting [VTPH-SEL] setting Meter connection phase
PH/G A A-N
B B-N
C C-N
PH/PH A
A-B
B B-C
C C-A
Voltage check element OVB, UVB, OVL1, UVL1, OVL2, and UVL2
•
Press 5 (= Logic circuit) on the "Test" screen to display the Logic circuit screen.
•
Enter a signal number for TermA line to observe at monitoring jack A and press the ENTER
key.
•
Apply three-phase rated voltage and single-phase rated voltage as shown in Figure 6.5.1.7.
OVB and UVB :
•
Change the magnitude of the three-phase voltage if the scheme switch [3PH-VT] is set to
"Bus" or adjust the magnitude of the single-phase voltage if it is set to "Line". Measure the
value at which the element operates and check that it is within
±
5% of the setting.
OVL1 and UVL1 :
•
Adjust the magnitude of the single-phase voltage if the scheme switch [3PH-VT] is set to
"Bus"; adjust the magnitude of the three-phase voltage if the scheme switch [3PH-VT] is set to
"Line". Measure the value at which the element operates and check that it is within
±
5% of the
setting.
OVL2 and UVL2 :
•
Adjust the magnitude of voltage applied to terminal 17 and 18 and measure the value at which
the element operates. Check that the measured value is within
±
5% of the setting.
Synchronism check element SYN1
•
Press 5 (= Logic circuit) on the Test screen to display the Logic circuit screen.
•
Enter a signal number for TermA line to observe at monitoring jack A and press the ENTER
key.
•
Apply a three-phase rated voltage and a single-phase rated voltage as shown Figure 6.5.1.7.
Voltage check:
•
Set the three-phase voltage to any value over the SY1OV setting. (The default setting of
SY1OV is 51 V.)
Whilst keeping Vs1 in-phase with Va, increase the single-phase voltage Vs1 from zero volt.
Measure the voltage at which the element operates. Check that the measured voltage is within
±
5% of the SY1UV setting.
•
Further increase Vs1 and measure the voltage at that the element resets. Check that the
measured voltage is within
±
5% of the SY1OV setting.