0 M
max
– Pickup1
M
max
t_MinTripDelay
Pickup1
E
max
E (only if f = fn = const)
t_MaxTrip
Delay
inverse delay law
overexcitation
under -
excitation
delay in s
ANSI99001067-2-
en.vsd
Overexcitation M-Pickup1
Excitation M
M=Pickup1
ANSI99001067 V2 EN
Figure 272: Restrictions imposed on inverse delays by t_MaxTripDelay and
t_MinTripDelay
A definite maximum time, t_MaxTripDelay, can be used to limit the operate time at
low degrees of overexcitation. Inverse delays longer than t_MaxTripDelay will not be
allowed. In case the inverse delay is longer than t_MaxTripDelay, OEXPVPH (24)
trips after t_MaxTripDelay seconds.
A definite minimum time, t_MinTripDelay, can be used to limit the operate time at
high degrees of overexcitation. In case the inverse delay is shorter than
t_MinTripDelay, OEXPVPH (24) function trips after t_MinTripDelay seconds. The
inverse delay law is not valid for values exceeding Mmax. The delay will be tMin,
irrespective of the overexcitation level, when values exceed Mmax (that is, M>Pickup1).
1MRK505222-UUS C Section 8
Voltage protection
535
Technical reference manual
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