Voltage Differential Protection Vdcptov (60); Identification; Application - ABB REB670 Applications Manual

Section 8
Voltage protection
8.4
8.4.1
8.4.2
244
ResetTypeCrvn: Set reset type curve for step n. This parameter 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 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 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> · (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 C 0
100
EQUATION1448 V1 EN
HystAbsn: Absolute hysteresis for step n, set in % of VBase. The setting of this parameter
is highly dependent of the application.

Voltage differential protection VDCPTOV (60)

Identification

Function description
Voltage differential protection

Application

The Voltage differential protection VDCPTOV (60) functions can be used in some
different applications.
• Voltage unbalance protection for capacitor banks. The voltage on the bus is
supervised with the voltage in the capacitor bank, phase- by phase. Difference
indicates a fault, either short-circuited or open element in the capacitor bank. It is
IEC 61850 IEC 60617
identification identification
VDCPTOV -
1MRK 505 337-UUS -
(Equation 79)
ANSI/IEEE C37.2
device number
60
Application manual