7.
Check that all trip and start contacts operate according to the configuration
(signal matrises).
8.
Finally check that start and trip information is stored in the event menu.
9.
Inject rated symmetric three phase voltage to the IED.
10. Set the injected current to 200% of the operate level of the tested stage, switch
on the current. The function does not start and trip.
11. Inject 95% of the set
ArmU<
value symmetric three-phase voltage to the IED.
12. Set the injected current to 200% of the operate level of the tested stage, switch
on the current. The function does start and trip.
12.5.14
Voltage-restrained time overcurrent protection VRPVOC
Prepare the IED for verification of settings outlined in section
in this chapter.
12.5.14.1
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>/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
(Equation 89)
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
100
sec
Re
U
UBase
VT
VTprim
StartCurr
IBase
×
+
×
×
sec
100
C
CT
CTprim
VDepFact
sec
×
100
IECEQUATION2433 V1 EN
(Equation 90)
Third part of the characteristic (
UHighLimit
/100*
UBase
≤ Restrain voltage):
1MRK502053-UEN B
Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC
171
Commissioning manual
Summary of Contents for REG670 2.0 IEC
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