ABB RED670 Commissioning Manual page 191

1MRK 505 378-UUS Rev. J
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revision
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11.5.15.2 Verifying the settings
Verifying settings by secondary injection
1. Connect the test set for three-phase current injection and three-phase voltage injection to the
appropriate IED terminals.
2. Go to Main menu /Settings /IED Settings /Current protection /VoltageRestOverCurr ( 51V,2(I>/
V<))/VRPVOC (51V,2(I>/V<)):1 /General and make sure that the function is enabled, that is,
Operation is set to Enabled.
3. The test of the function may be performed by injecting restrain voltage and increasing the injected
current(s). Note the value at which the PICKUP and STOC signals are set.
The set trip value in secondary amperes is calculated according to the following equations:
First part of the characteristic (Restrain voltage ≤ 25% of VBase):
Picup Curr
ANSI13000291 V1 EN-US
Second part of the characteristic (25% of VBase ≤ Restrain voltage ≤ VHighLimit/100*VBase), valid
when setting parameter VDepMode = Slope:


Pickup Curr





 

ANSIEQUATION2433 V2 EN-US
Third part of the characteristic (VHighLimit/100*VBase ≤ Restrain voltage):
Picup Curr
ANSIEQUATION2434 V1 EN-US
Example (rated secondary current = 5A):
CT ratio
VT ratio
Pickup_Curr
VDepFact
Table continues on next page
Line differential protection RED670
Commissioning manual
Product History
revision
2.2.4 -
2.2.4 -
2.2.4 -
2.2.5 Previously called settings Characterist and t_DefOC had their names changed to
Characteristic and t_OC for more clear understanding.
In the following equations, restrain voltage is the magnitude of the minimum phase-
to-phase voltage in secondary volts.
_ CT sec VDepFact
IBase
× × ×
100 CTprim


_ CT sec VDepFact
× ×  × −
IBase  1

100 CTprim  100
( )
−
V V HighLimit 25
VT sec
× ×
VBase
100 VTprim
_ CT sec
IBase
× ×
100 CTprim
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100




25 VT sec
× − × ×
 Re strainVoltage VBase
 10 0 0 VTprim
10 000/5A
10 kV/100 V
100%
25%
Testing functionality by secondary injection
GUID-3A2B7FF5-330E-4A0D-AB74-EBAE6258C176 v1
GUID-39632D30-A8D8-417D-985C-8F886106783E v4


 
Pickup Curr _ CT sec VDepFact

+ × × ×
  IB a a se

  100 CTprim 100
 

Section 11
(Equation 92)



(Equation 93)
(Equation 94)
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