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Overvoltage and undervoltage elements and their output signal number are listed below.
• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
Operating value test of OVS1, OVS2, OVG1, OVG2
• Apply a rated voltage as shown in Figure 6.5.1.10.
• Increase the voltage and measure the value at which the element operates. Check that the
measured value is within ± 5% of the setting.
Operating value test of UVS1, UVS2, UVG1, UVG2
• Apply a rated voltage and frequency as shown Figure 6.5.1.10.
• 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 of OVS1, OVG1, UVS1, UVG1 IDMT curves
• Apply a rated voltage at the IDMT time multiplier setting 10.0 of the relay.
• Change the voltage from the rated voltage to the test voltage quickly and measure the
operating time. Test voltage: 1.5 × (setting voltage) or 0.5 × (setting voltage)
• Calculate the theoretical operating time using the characteristic equations shown in Section
2.9.1 and 2.9.2. Check the measured operating time within ± 5%.
6.5.1.10 Out-of-step element OST
The out-of-step element can be tested with an end-to-end setup using two relays.
Figure 6.5.1.11 (a) and (b) shows the testing circuits of the laboratory test and on-site test. For
the test setup, refer to Section 6.5.1.1.
Element
Signal No.
OVS1-AB
639
OVS2-AB
642
OVG1-A
645
OVG2-A
648
UVS1-AB
663
UVS2-AB
666
UVG1-A
669
UVG2-A
672
263
6 F 2 S 0 8 5 0
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