Completing The Test; Two Step Overvoltage Protection Ov2Ptov; Verifying The Settings - Hitachi Relion 670 Series Commissioning Manual

1MRK 511 403-UEN Rev. L
For phase-to-phase measurement:
U
1
100
IECEQUATION2431 V1 EN-US
5. Increase the measured voltage to rated load conditions.
6. Check that the START signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower than the
measured operate value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
9. Check the inverse time delay by injecting a voltage corresponding to 0.8 × U1<.
( )
t s
IECEQUATION2428 V1 EN-US
where:
t(s)
k1
U
U1<
For example, if the measured voltage jumps from the rated value to 0.8 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.
10. The test above can be repeated to check the inverse time characteristic at different voltage
levels.
11. Repeat the above described steps for Step 2 of the function.
Extended testing
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
11.5.1.2

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.5.2

Two step overvoltage protection OV2PTOV

Prepare the IED for verification of settings as outlined in section
section
11.5.2.1

Verifying the settings

Verification of single-phase voltage and time delay to operate for Step 1
Bay control REC670
Commissioning manual
VT
sec
<
UBase
× ×
VTprim
For example, if the inverse time curve A is selected, the trip signals TR1 and TRIP
operate after a time corresponding to the equation:
k 1
=
 
U
−
1
 
<
 
U
1
Operate time in seconds
Settable time multiplier of the function for step 1
Measured voltage
Set start voltage for step 1
"Preparing for test" in this chapter.
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Testing functionality by secondary injection
"Requirements" and
Section 11
(Equation 21)
(Equation 22)
M13796-35 v8
M13796-25 v5
M13806-2 v6
M13806-9 v2
M13806-50 v10
121