Hitachi Relion 670 Series Commissioning Manual page 181

1MRK506371-UUS Rev. M
than the set tripping level, and check the definite time delay for trip (the signals TROC and TRIP of
the protection function VRPVOC are active in trip condition).
9. If inverse time delay is used for the overcurrent step, the parameter setting Characterist shall be
properly set; we can refer, for example, to the setting IEC Very inv.; If the IEC Very inverse time
characteristic is selected, the trip signals TROC and TRIP will trip after a time defined by the
equation:
[ ]
t s
ANSIEQUATION2435 V1 EN-US
where:
t
I
Pickup_Curr Set trip value
This means that if the measured phase current jumps from 0 to 2 times the set trip level and time
multiplier k is set to 1.0 s (default value), then the TROC and TRIP signals will trip 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 IA 200% higher than the set operation level, and check the trip
time delay.
10. Check the pickup and trip 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>/V<)) /
VRPVOC(51V,2(I>/V<)):1 /Undervoltage and set the setting Operation_UV = Enabled to activate
the undervoltage stage.
13. Slowly decrease the voltage in two phases simultaneously, until the STUV and PICKUP signals
appear.
14. Note the trip value. The set trip value in secondary volts is calculated according to the following
equation:
Pickup Volt VBase
ANSIEQUATION2436 V2 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 PICKUP
signals reset as well as the trip signals of the function block (TRIP and TRUV).
Line distance protection REL670
Commissioning manual
13 5 . * k
=
 
I
 −
 1
 Pickup Curr _ 
Trip time in seconds
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
× ×
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 trip. In order to achieve that, apply symmetric three-phase voltages
at their rated value and then inject a current IA that is 200% higher than the set tripping level.
Then slowly decrease the voltage in two phases simultaneously, until the STUV and PICKUP
signals appear.
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sec
Section 11
Testing functionality by secondary injection
(Equation 92)
(Equation 93)
175