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1MRK 505 370-UEN D
tIResetn : Reset time for step n if inverse time delay is used, given in s. The default value is 25
ms.
kn : 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
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
IntBlkSeln : This parameter can be set to Off , 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
is prevented.
IntBlkStValn : Voltage level under which the blocking is activated set in % of UBase . This setting
must be lower than the setting
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 operate time delay of
the undervoltage protection step.
8.2
Two step overvoltage protection OV2PTOV
8.2.1
Identification
Function description
Two step overvoltage protection
8.2.2
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.
Busbar protection REB670
Application manual
Technical manual .
Un< . As switch of shall be detected the setting can be very low,
IEC 61850
IEC 60617
identification
identification
OV2PTOV
SYMBOL-C-2U-SMALLER-THAN V2 EN-US
Technical manual .
Block of trip or Block all unwanted trip
ANSI/IEEE C37.2
device number
59
3U>
Section 8
Voltage protection
IP14545-1 v3
M17002-1 v8
M13799-3 v9
209
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