Two Step Overvoltage Protection Ov2Ptov; Identification; Application - ABB REQ650 Applications Manual

Section 7
Voltage protection
7.2
7.2.1
7.2.2
158
t1Min longer than the operation time for other protections such unselective tripping
can be avoided.
k1: Time multiplier for inverse time characteristic. This parameter is used for
coordination between different inverse time delayed undervoltage protections.
The function must be externally blocked when the protected object is
disconnected.

Two step overvoltage protection OV2PTOV

Identification

Function description
Two step overvoltage protection

Application

Two step overvoltage protection OV2PTOV is applicable in all situations, where
reliable detection of high voltage is necessary. OV2PTOV 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 is applied to power system elements, such as generators, transformers,
motors and power lines in order to detect high voltage conditions. OV2PTOV is used
in combination with low current signals, to identify a transmission line, open in the
remote end. In addition to that, OV2PTOV 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 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:
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
IEC 61850 IEC 60617
identification identification
OV2PTOV
3U>
SYMBOL-C-2U-SMALLER-THAN
V2 EN
1MRK 505 291-UEN A
ANSI/IEEE C37.2
device number
59
Application manual