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UV1D-1
UV2D-1
ZOV1D
ZOV2D
OV1I-1
UV1I-1
ZOV1I
• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
Operating Value Test
Overvoltage element OV1D, OV2D, ZOV1D, ZOV2D
• Apply a rated voltage as shown in Figure 6.5.10.
• Increase the voltage and measure the value at which the element operates. Check that the
measured value is within ± 5% of the setting.
Undervoltage element UV1D, UV2D
• Apply a rated voltage and frequency as shown Figure 6.5.10.
• Decrease the voltage and measure the value at which the element operates. Check that the
measured value is within ± 5% of the setting.
Operating Time Check For Inverse Time (IDMT) Curve, OV1I, UV1I, ZOV1I
• Change the voltage from the rated voltage to the test voltage quickly and measure the
operating time.
• Calculate the theoretical operating time using the characteristic equations shown in Section
2.2.1 and 2.2.2. Check the measured operating time.
6.5.1.10 Negative sequence overvoltage element NOV1 and NOV2
The testing circuit is shown in Figure 6.5.11.
Va
Three-phase
V b
Voltage
source
V c
V
N
+
DC
power
−
supply
DC
voltmeter
V
Figure 6.5.11 Testing NOV elements
⎯
⎯
265
204
208
228
229
212
220
244
GRD150
TB1
-11
-12
-13
-14
-15
-16
A
Monitoring
jack
0V
TB4
-18
-19
-20
(E)
6 F 2 S 0 8 4 2
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