ABB Relion 670 Series Applications Manual page 235

1MRK 505 370-UUS Rev. K
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 for step n, to set to create programmable undervoltage
inverse time characteristic. Description of this can be found in the technical reference manual.
CrvSatn: Set tuning parameter for step n. When the denominator in the expression of the programmable
curve is equal to zero, the time delay will be infinite. 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> · (1.0 + CrvSatn/100) the used voltage will be: Pickup> · (1.0 + CrvSatn/100). If the
programmable curve is used this parameter must be calculated so that:
CrvSatn
×
B
100
EQUATION1448 V1 EN-US
HystAbsn: Absolute hysteresis for step n, set in % of VBase. The setting of this parameter is highly
dependent of the application. The hysteresis is used to avoid oscillations of the PICKUP output signal.
This signal resets when the measured voltage drops below the setting level and leaves the hysteresis
area. Make sure that the set value for parameter HystABSn is somewhat smaller than the set pickup
value. Otherwise there is a risk that step n will not reset properly.
8.4 Voltage differential protection VDCPTOV (60)
8.4.1 Function revision history
Document
revision
A
B
C
D
E
F
G
J
K
8.4.2 Identification
Function description
Voltage differential protection
Busbar protection REB670
Application manual
- >
C 0
Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.5 -
IEC 61850
identification
VDCPTOV
© 2017 - 2021 Hitachi Power Grids. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
- 60
Section 8
Voltage protection
(Equation 78)
SEMOD153860-1 v2
GUID-04679E4E-E0D2-4BA6-A002-4020E52DB973 v1
SEMOD167723-2 v2
229