For phase-to-earth measurement:
U
UBase VT
VTprim
1
100
3
>
×
×
sec
IECEQUATION2426 V1 EN
(Equation 97)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
>
×
×
sec
IECEQUATION2427 V1 EN
(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.
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.
10.6.2.2
Extended testing
1.
The tests above can be repeated for
2 out of 3
and for
3 out of 3
operation mode.
10.6.2.3
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.
10.6.3
Two step residual overvoltage protection ROV2PTOV
Prepare the IED for verification of settings outlined in section
.
10.6.3.1
Verifying the settings
1.
Apply a single-phase voltage either to a single-phase voltage input or to a
residual voltage input with the start value below the set value
U1>
.
2.
Slowly increase the value until ST1 appears.
3.
Note the operate value and compare it with the set value.
4.
Decrease the voltage slowly and note the reset value.
5.
Set and apply a 20% higher voltage than the measured operate value for one
phase.
1MRK 506 355-UEN A
Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC
173
Commissioning manual
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