Completing The Test - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
I
StartCurr Set operate value
This means that if the measured phase current jumps from 0 to 2 times the set operate level
and time multiplier k is set to 1.0 s (default value), then the TROC and TRIP signals will operate
after a time delay equal to 13.5 s ± tolerance.
Taking into account the above explanation, inject the voltages related to the last part of the
characteristic and inject a current IL1 200% higher than the set operation level, and check the
trip time delay.
10. Check the start and operate information that are stored in the event menu.
11. The previous step 8 or 9 may be repeated also for the first and second section of the
characteristic.
12. Supply the IED with symmetric three-phase voltages at their rated values. Go to Main menu /
Settings /IED Settings /Current protection /VoltageRestOverCurr(51V,2(I>/U<)) /
VRPVOC(51V,2(I>/U<)):1 /Undervoltage and set the setting Operation_UV = On to activate
the undervoltage stage.
13. Slowly decrease the voltage in two phases simultaneously, until the STUV and START signals
appear.
14. Note the operate value. The set operate value in secondary volts is calculated according to the
following equation:
StartVolt UBase
IECEQUATION2436 V1 EN-US
15. Increase slowly the applied voltages of the previous two phases and note the reset value.
16. Check that the trip output of the relay is connected to the input channel of the test in order to
stop the injection and measure the trip time.
17. Inject symmetric three-phase voltages at their rated value and check that the STUV and START
signals reset as well as the trip signals of the function block (TRIP and TRUV).
18. Instantaneously decrease the voltage in two phases simultaneously to a value 20% lower than
the set operate value (take into account the previous note if VRPVOC is configured in ACT with
the undervoltage seal-in feature).
19. Measure the definite time delay for the TRUV and TRIP signals and compare it with the set
value tDef_UV.
20. Check that start and operate information is stored in the event menu.
11.4.17.3

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
116
Measured value (for example, phase current)
If tDef_OC is set to a value different from 0 s, then this time delay is added to the
one that is defined by the IDMT characteristic.
VT sec
× ×
100 VTprim
3
If the VRPVOC function is used as an overcurrent protection with undervoltage
seal-in, it is necessary to first inject sufficient current to activate the STOC signal
before the under-voltage step is allowed to operate. In order to achieve that, apply
symmetric three-phase voltages at their rated value and then inject a current IL1
that is 200% higher than the set operation level. Then slowly decrease the voltage
in two phases simultaneously, until the STUV and START signals appear.
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1MRK 511 403-UEN Rev. L
(Equation 19)
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