Two Step Residual Overvoltage Protection Rov2Ptov - ABB REG670 Applications Manual

Section 10
Voltage protection
10.3
10.3.1
10.3.2
410
ResetTypeCrvn: This parameter for inverse time characteristic can be set:
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.
kn: Time multiplier for inverse time characteristic. This parameter is used for co-
ordination between different inverse time delayed undervoltage protections.
ACrvn, BCrvn, CCrvn, DCrvn, PCrvn: Parameters to set to create programmable
under voltage inverse time characteristic. Description of this can be found in the
technical reference manual.
CrvSatn: When the denominator in the expression of the programmable curve is equal
to zero the time delay will be infinity. There will be an undesired discontinuity.
Therefore a tuning parameter CrvSatn is set to compensate for this phenomenon. In
the voltage interval Un> up to Un> · (1.0 + CrvSatn/100) the used voltage will be:
Un> · (1.0 + CrvSatn/100). If the programmable curve is used, this parameter must be
calculated so that:
CrvSatn
× - >
B C 0
100
EQUATION1448 V1 EN
HystAbsn: Absolute hysteresis set in % of UBase. The setting of this parameter is
highly dependent of the application. If the function is used as control for automatic
switching of reactive compensation devices the hysteresis must be set smaller than the
voltage change after switching of the compensation device.
Two step residual overvoltage protection
ROV2PTOV
Identification
Function description
Two step residual overvoltage
protection
Application
Two step residual overvoltage protection ROV2PTOV is primarily used in high
impedance earthed distribution networks, mainly as a backup for the primary earth-
fault protection of the feeders and the transformer. To increase the security for
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
IEC 61850 IEC 60617
identification identification
ROV2PTOV
2(U0>)
IEC15000108 V1 EN
1MRK 502 071-UEN -
(Equation 243)
ANSI/IEEE C37.2
device number
59N
Application manual