ABB REG670 2.0 IEC, Commissioning Manual

Page: 186 / 268

where:
t(s)
Operate time in seconds
k1 Settable time multiplier of the function for step 1
U Measured voltage
U1> Set start voltage for step 1
For example, if the measured voltage jumps from 0 to 1.2 times the set start
voltage level and time multiplier k1 is set to 0.05 s (default value), then the TR1
and TRIP signals operate at a time equal to 0.250 s ± tolerance.
8. Repeat the test for Step 2 of the function.
12.6.3.2 Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off . Restore connections and settings to their original values, if they were changed for
testing purposes.
12.6.4 Overexcitation protection OEXPVPH
Prepare the IED for verification of settings outlined in section "Requirements" and
section "Preparing for test" in this chapter.
12.6.4.1 Verifying the settings
1. Enable function.
2. Connect a symmetrical three-phase voltage input from the test set to the
appropriate connection terminals of the overexcitation protection OEXPVPH is
configured for a three-phase voltage input.
A single-phase injection voltage is applied if the function is configured for a
phase-to-phase voltage input.
OEXPVPH is conveniently tested using rated frequency for the injection voltage
and increasing the injection voltage to get the desired overexcitation level.
3. Connect the alarm contact to the timer and set the time delay tAlarm temporarily
to zero.
4. Increase the voltage and note the operate value V/Hz> .
5. Reduce the voltage slowly and note the reset value.
6. Set the alarm time delay to the correct value according to the setting plan and
check the time delay, injecting a voltage corresponding to 1.2 ·
V/Hz> .
7. Connect a trip output contact to the timer and temporarily set the time delay tMin
to 0.5s.
8. Increase the voltage and note the V/Hz>> operate value
9. Reduce the voltage slowly and note the reset value.
10. Set the time delay to the correct value according to the setting plan and check the
time delay tMin , injecting a voltage corresponding to 1.2 · V/Hz>> .
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
180 Generator protection REG670 2.0 IEC
Commissioning manual