ABB REB670 - Two Step Overvoltage Protection OV2 PTOV (59); Identification; Application

prevent function when the protected object is switched off. If the parameter is set Block
of trip or Block all unwanted trip is prevented.
IntBlkStValn: V
oltage level under which the blocking is activated set in % of VBase.
This setting must be lower than the setting Pickupn. As switch of shall be detected the
setting can be very low, that is, about 10%.
tBlkUVn: Time delay to block the undervoltage step n when the voltage level is below
IntBlkStValn, given in s. It is important that this delay is shorter than the trip time delay
of the undervoltage protection step.
8.2 Two step overvoltage protection OV2PTOV (59)
IP14545-1 v3
8.2.1 Identification
M17002-1 v8
Function description IEC 61850
identification
IEC 60617 identification ANSI/IEEE C37.2
device number
Two step overvoltage protection OV2PTOV
3U>
SYMBOL-C-2U-SMALLER-THAN V2 EN-US
59
8.2.2 Application
M13799-3 v9
Two step overvoltage protection OV2PT
OV (59) is applicable in all situations, where
reliable detection of high voltage is necessary. OV2PTOV (59) is used for supervision
and detection of abnormal conditions, which, in combination with other protection
functions, increase the security of a complete protection system.
High overvoltage conditions are caused by abnormal situations in the power system.
OV2PTOV (59) is applied to power system elements, such as generators, transformers,
motors and power lines in order to detect high voltage conditions. OV2PTOV (59) is
used in combination with low current signals, to identify a transmission line, open in
the remote end. In addition to that, OV2PTOV (59) is also used to initiate voltage
correction measures, like insertion of shunt reactors, to compensate for low load, and
thereby decreasing the voltage. The function has a high measuring accuracy and
hysteresis setting to allow applications to control reactive load.
OV2PTOV (59) is used to disconnect apparatuses, like electric motors, 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:
Section 8 1MRK 505 370-UUS A
Voltage protection
246 Busbar protection REB670 2.2 ANSI
Application manual