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GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
OperationUV: Used to set the under-voltage function On or Off.
U<: Level of low voltage detection, given in % of UBase. This setting should be based on fault
calculations to find the voltage decrease in case of a fault at the most remote point where the
direct trip scheme shall be active. The phase voltages shall be calculated for different types of
faults (single phase-to-earth, phase-to-phase to earth, phase-to-phase and three-phase short
circuits) at different switching states in the network.
tUV: Time delay for trip in case of low voltage detection
OperationOV: Used to set the over-voltage function On or Off.
U>: Level of high voltage detection, given in % of UBase. This setting should be based on fault
calculations to find the voltage increase in case of an earth fault at the most remote point
where the direct trip scheme shall be active. The phase voltages shall be calculated for
different types of faults (single phase-to-earth and phase-to-phase to earth) at different
switching states in the network. The setting must be higher than the largest phase voltage
that can occur during non-disturbed network operation.
tOV: Time delay for trip in case of high voltage detection.
R1: Positive sequence line resistance given in ohm.
X1: Positive sequence line reactance given in ohm.
Xc: Half the value of the equivalent Positive sequence capacitive shunt reactance of the line
given in ohm.
EnShuntReactor: Set On or Off to enable the charging current to be involved in the voltage
compensation calculation.
Xsh: Per phase reactance of the line connected shunt reactor given in ohm.
15.8.5
Sudden change in current variation SCCVPTOC
GUID-61E9C823-5313-4682-93CB-2BA6AC0A0640 v1
15.8.5.1
Identification
GUID-3B6E6472-8153-4D8F-874B-DF68891296C8 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Sudden change in current variation
SCCVPTOC
-
51
15.8.5.2
Application
GUID-C97C2326-98DA-428D-92CD-4FF4658E2142 v1
The Sudden change in current variation (SCCVPTOC) function is fast way of finding any
abnormality in line currents. When there is a fault in the system then current changes faster
than the voltage. SCCVPTOC finds abnormal condition based on phase-to-phase current
variation. The main application is as one of local criterion to increase security when transfer
trips are used.
15.8.5.3
Setting guidelines
GUID-00CE5289-3789-437D-A9AE-8E4BDD7C9D8A v2
Section 15
1MRK 505 343-UEN B
Scheme communication
626
Application manual
Summary of Contents for Relion 670 series
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