ABB REL670 2.2 IEC - Sudden Change in Current Variation SCCVPTOC

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.
16.8.5 Sudden change in current variation SCCVPTOC
GUID-61E9C823-5313-4682-93CB-2BA6AC0A0640 v1
16.8.5.1 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
16.8.5.2 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
1MRK 506 369-UEN B Section 16
Scheme communication
Line distance protection REL670 2.2 IEC 733
Application manual