ABB Relion 670 Series Applications Manual page 227

1MRK 511 401-UUS F
tnMin : Minimum operation time for inverse time characteristic for step n , given in s. For very high
voltages the overvoltage function, using inverse time characteristic, can give very short operation
time. This might lead to unselective trip. By setting
protections such unselective tripping can be avoided.
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.
TDn : 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 Pickup> up to Pickup> ·
CrvSatn /100) the used voltage will be: Pickup> · (1.0 + CrvSatn /100). If the programmable
(1.0 +
curve is used, this parameter must be calculated so that:
CrvSatn
×
B
100
EQUATION1448 V1 EN-US
HystAbsn : Absolute hysteresis set in % of VBase . 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.
9.3 Two step residual overvoltage protection ROV2PTOV
(59N)
9.3.1 Identification
Function description
Two step residual overvoltage
protection
9.3.2 Application
Two step residual overvoltage protection ROV2PTOV (59N) is primarily used in high impedance
grounded distribution networks, mainly as a backup for the primary ground fault protection of the
feeders and the transformer. To increase the security for different ground fault related functions,
the residual overvoltage signal can be used as a release signal. The residual voltage can be
Bay control REC670
Application manual
- >
C 0
IEC 61850
identification
ROV2PTOV
© Copyright 2017 ABB. All rights reserved
t1Min longer than the operation time for other
IEC 60617 ANSI/IEEE C37.2
identification device number
59N
2(U0>)
IEC15000108 V1 EN-US
Section 9
Voltage protection
(Equation 98)
IP14546-1 v4
SEMOD54295-2 v6
M13809-3 v8
221