11.5.13.1 Verifying the settings
GUID-3A2B7FF5-330E-4A0D-AB74-EBAE6258C176 v1
Verifying settings by secondary injection
GUID-39632D30-A8D8-417D-985C-8F886106783E v4
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>/U<))/VRPVOC (51V,2(I>/U<)):1/
General and make sure that the function is enabled, that is, Operation is set
to On.
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 START and
STOC signals are set.
In the following equations, restrain voltage is the magnitude
of the minimum phase-to-phase voltage in secondary volts.
The set operate value in secondary amperes is calculated according to the
following equations:
First part of the characteristic (Restrain voltage ≤ 25% of UBase):
StartCurr
IBase
CT
CTprim
VDepFact
100 100
× × ×
sec
IECEQUATION2432 V1 EN-US (Equation 92)
Second part of the characteristic (25% of UBase ≤ Restrain voltage
≤
UHighLimit
/100*UBase), valid when setting parameter VDepMode = Slope:
StartCurr
IBase
CT
CTprim
VDepFact
UH
100
1
100
× ×
× −
sec
iighLimit
UBase
VT
VTprim
strainVoltage
−
( )
× ×
× − ×
25
100
25
100sec
Re UUBase
VT
VTprim
StartCurr
IBase×
+ × ×
sec
100
CCT
CTprim
VDepFactsec
×
100
IECEQUATION2433 V1 EN-US (Equation 93)
Third part of the characteristic (UHighLimit/100*UBase ≤ Restrain voltage):
StartCurr
IBase
CT
CTprim100
× ×
sec
IECEQUATION2434 V1 EN-US (Equation 94)
Example (rated secondary current = 1A):
CT ratio 10 000/1A
VT ratio 10 kV/100 V
StartCurr 100%
VDepFact 25%
Table continues on next page
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 193
Commissioning manual
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