Sudden Change In Current Variation Sccvptoc - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
16.8.5
16.8.5.1
16.8.5.2
Line distance protection REL670 2.2 IEC
Application manual
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.

Sudden change in current variation SCCVPTOC

Identification
Function description
Sudden change in current variation
Application
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
Scheme communication
IEC 61850 IEC 60617
identification identification
SCCVPTOC
Section 16
GUID-61E9C823-5313-4682-93CB-2BA6AC0A0640 v1
GUID-3B6E6472-8153-4D8F-874B-DF68891296C8 v1
ANSI/IEEE C37.2
device number
- 51
GUID-C97C2326-98DA-428D-92CD-4FF4658E2142 v1
733