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 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
M13796-35 v8
The tests above can be repeated for
2 out of 3 and for 3 out of 3 operation mode.
12.6.1.2
Completing the test
M13796-25 v5
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.
12.6.2
Two step overvoltage protection OV2PTOV
M13806-2 v6
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
12.6.2.1
Verifying the settings
M13806-9 v2
Verification of single-phase voltage and time delay to operate for Step 1
M13806-50 v8
1.
Apply single-phase voltage below the set value
U1>.
2.
Slowly increase the voltage until the ST1 signal appears.
3.
Note the operate value and compare it with the set value
U1>.
The operate value in secondary volts is calculated according to the
following equations:
For phase-to-earth measurement:
U
UBase VT
VTprim
1
100
3
>
×
×
sec
IECEQUATION2426 V1 EN-US
(Equation 97)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
>
×
×
sec
IECEQUATION2427 V1 EN-US
(Equation 98)
4.
Decrease the voltage slowly and note the reset value.
5.
Set and apply about 20% higher voltage than the measured operate value for one phase.
6.
Measure the time delay for the TR1 signal and compare it with the set value.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
184
Commissioning manual
