9.2 Two step overvoltage protection O2RWPTOV
GUID-42CCBD71-1D8E-44A1-97D4-2391342FB76E v1
9.2.1 Identification
M17002-1 v8
Function description IEC 61850
identification
IEC 60617 identification ANSI/IEEE C37.2
device number
Overvoltage protection, two steps O2RWPTOV
IEC15000214 V1 EN-US
59
9.2.2 Application
M13799-3 v9
Two step overvoltage protection O2R
WPTOV is applicable in situations where
reliable detection of high voltage is necessary. O2RWPTOV is used for supervision
and detection of abnormal conditions, which in combination with other protection
functions, to increase the security of a complete protection system.
High overvoltage conditions are caused by abnormal situations in the power
system. O2RWPTOV is applied to transformers and power lines in order to detect
high voltage conditions. O2RWPTOV is used in combination with low current
signals to identify a transmission line open in the remote end.
O2RWPTOV is used to disconnect apparatuses which will be damaged when
subject to service under high voltage conditions. It deals with high voltage
conditions at power system frequency, which can be caused by:
1. Different kinds of faults, where a too high voltage appears in a certain power
system, like metallic connection to a higher voltage level (broken conductor
falling down to a crossing overhead line, transformer flash over fault from the
high voltage winding to the low voltage winding and so on).
2. Malfunctioning of a voltage regulator or wrong settings under manual control
(symmetrical voltage decrease).
3. Low load compared to the reactive power generation (symmetrical voltage
decrease).
4. Earth-faults in high impedance earthed systems causes, beside the high voltage
in the neutral, high voltages in the non-faulted phase, (unsymmetrical voltage
increase).
O2RWPTOV prevents sensitive equipment from running under conditions that
could cause their overheating or stress of insulation material, and, thus, shorten
their life time expectancy. In many cases, it is a useful function in circuits for local
or remote automation processes in the power system.
Section 9 1MRK 506 375-UEN A
Voltage protection
198 Railway application RER670 2.2 IEC
Application manual
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