EQUATION1448 V1 EN (Equation 512)
HystAbsn: Absolute hysteresis set in % of VBase. The setting of this parameter is highly
dependent of the application. If the function is used as control for automatic switching of
reactive compensation devices the hysteresis must be set smaller than the voltage change
after switching of the compensation device.
10.3 Two step residual overvoltage protection ROV2PTOV
(59N)
10.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Two step residual overvoltage
protection
ROV2PTOV
IEC15000108 V1 EN
59N
10.3.2 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.
1MRK 506 369-UUS - Section 10
Voltage protection
Line distance protection REL670 2.2 ANSI 575
Application manual
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