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
IECEQUATION2430 V1 EN-US
(Equation 1)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
<
×
×
sec
IECEQUATION2431 V1 EN-US
(Equation 2)
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<.
For example, if the inverse time curve A is selected, the trip signals TR1
and TRIP operate after a time corresponding to the equation:
t s
k
U
U
( )
=
−
<
1
1
1
IECEQUATION2428 V1 EN-US
(Equation 3)
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 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.
9.4.1.2
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.
Section 9
1MRK 505 385-UEN C
Testing functionality by secondary injection
72
Breaker protection REQ650
Commissioning manual
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