ABB Relion 670 Series Applications Manual page 227

1MRK 505 370-UUS Rev. K
ResetTypeCrvn: This parameter for inverse time characteristic can be set to Instantaneous, Frozen time,
Linearly decreased. The default setting is Instantaneous.
tIResetn: Reset time for step n if inverse time delay is used, given in s. The default value is 25 ms.
TDn: Time multiplier for inverse time characteristic. This parameter is used for coordination between
different inverse time delayed undervoltage protections.
ACrvn, BCrvn, CCrvn, DCrvn, PCrvn: Parameters to create a programmable under voltage inverse time
characteristic. Description of this can be found in the Technical manual.
CrvSatn: Tuning parameter that is used to compensate for the undesired discontinuity created when the
denominator in the equation for the customer programmable curve is equal to zero. For more information,
see the Technical manual.
IntBlkSeln: This parameter can be set to Disabled, Block of trip, Block all. In case of a low voltage the
undervoltage function can be blocked. This function can be used to 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: Voltage 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)
8.2.1 Identification
Function description
Two step overvoltage protection
8.2.2 Application
Two step overvoltage protection OV2PTOV (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
Busbar protection REB670
Application manual
IEC 61850
identification
OV2PTOV
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IEC 60617 identification ANSI/IEEE C37.2
device number
59
3U>
SYMBOL-C-2U-SMALLER-THAN V2 EN-US
Section 8
Voltage protection
IP14545-1 v3
M17002-1 v8
M13799-3 v9
221