Document
revision
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revision
History
H
2.2.4
-
J
2.2.4
-
K
2.2.5
Previously called settings
Characterist
and
t_DefOC
had their names changed to
Characteristic
and
t_OC
for more clear understanding.
11.4.17.2
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 15)
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-US
(Equation 16)
Third part of the characteristic (
UHighLimit
/100*
UBase
≤ Restrain voltage):
StartCurr
IBase
CT
CTprim
100
×
×
sec
IECEQUATION2434 V1 EN-US
(Equation 17)
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
Section 11
1MRK 511 403-UEN Rev. L
Testing functionality by secondary injection
114
Bay control REC670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Summary of Contents for REC670
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