TDn: Time multiplier for inverse time characteristic. This parameter is used for co-
ordination between dif
ferent 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:
EQUATION1448 V1 EN-US (Equation 484)
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.
10.4 Overexcitation protection OEXPVPH (24)
IP14547-1 v3
10.4.1 Identification
M14867-1 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overexcitation protection OEXPVPH
SYMBOL-Q V1 EN-US
24
10.4.2 Application
M13785-3 v6
When the laminated core of a power transformer is subjected to a magnetic flux density
beyond its design limits, stray flux will flow into non-laminated components not
designed to carry flux and cause eddy currents to flow
. The eddy currents can cause
Section 10 1MRK 504 163-UUS A
Voltage protection
626 Transformer protection RET670 2.2 ANSI
Application manual
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