ABB Relion 670 Series Applications Manual page 231

1MRK 505 370-UUS Rev. K
8.3 Two step residual overvoltage protection ROV2PTOV
(59N)
8.3.1 Function revision history
Document
revision
A
B
C
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J
K
8.3.2 Identification
Function description
Two step residual overvoltage
protection
8.3.3 Application
Two step residual overvoltage protection ROV2PTOV (59N) is primarily used in high impedance
grounded distribution networks, mainly as a backup for the primary ground fault protection of the feeders
and the transformer. To increase the security for different ground fault related functions, the residual
overvoltage signal can be used as a release signal. The residual voltage can be measured either at the
transformer neutral or from a voltage transformer open delta connection. The residual voltage can also
be calculated internally, based on the measurement of the three phase-to-ground voltages.
In high impedance grounded systems the residual voltage will increase in case of any fault connected to
ground. Depending on the type of fault and fault resistance the residual voltage will reach different
values. The highest residual voltage, equal to three times the phase-to-ground voltage, is achieved for a
single phase-to-ground fault. The residual voltage increases approximately to the same level in the whole
system and does not provide any guidance in finding the faulted component. Therefore, ROV2PTOV
(59N) is often used as a backup protection or as a release signal for the feeder ground fault protection.
Busbar protection REB670
Application manual
Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.5 -
IEC 61850
identification
ROV2PTOV
© 2017 - 2021 Hitachi Power Grids. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
59N
2(U0>)
IEC15000108 V1 EN-US
Section 8
Voltage protection
IP14546-1 v4
GUID-22110E0B-DEFB-461F-A437-4D221DB88799 v2
SEMOD54295-2 v6
M13809-3 v8
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