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1MRK 505 378-UEN Rev. K
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.
11.6.1.2
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.
11.6.2
Two step overvoltage protection OV2PTOV
Prepare the IED for verification of settings as outlined in section
section
11.6.2.1
Verifying the settings
Verification of single-phase voltage and time delay to operate for Step 1
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>.
For phase-to-earth measurement:
U
1
100
IECEQUATION2426 V1 EN-US
For phase-to-phase measurement:
U
1
100
IECEQUATION2427 V1 EN-US
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.
7.
Check the inverse time delay by injecting a voltage corresponding to 1.2 × U1>.
8.
Repeat the test to check the inverse time characteristic at different over-voltage levels.
9.
Repeat the above described steps for Step 2 of the function.
11.6.2.2
Extended testing
1.
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
Line differential protection RED670
Commissioning manual
"Preparing for test"
in this chapter.
The operate value in secondary volts is calculated according to the following
equations:
UBase VT
sec
>
×
×
VTprim
3
VT
sec
>
UBase
×
×
VTprim
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Testing functionality by secondary injection
"Requirements"
and
(Equation 100)
(Equation 101)
GUID-BE4B4A36-CCEE-4020-B7DC-6A83A43D11F5 v2
Section 11
M13796-35 v8
M13796-25 v5
M13806-2 v6
M13806-9 v2
M13806-50 v10
183
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