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measured
measured
rated
measured
measured
rated
M
V
V
f
f
VBase
VBase f
f
=
=
×
æ
ö
ç
÷
è
ø
æ
ö
ç
÷
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ø
ANSIEQUATION2404 V1 EN
(Equation 90)
Inverse delays as per figure
, can be modified (limited) by a special definite delay
setting
t_MinTripDelay
, see figure
.
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 139:
Restrictions imposed on inverse delays by
A definite maximum time of 1800 seconds is used to limit the operate time at low degrees
of overexcitation of
Pickup1
. Inverse delays longer than 1800 seconds will not be allowed.
In case the inverse delay is longer than 1800 seconds, OEXPVPH (24) trips
t_MaxTripDelay
.
A definite minimum time
t_MinTripDelay
, can be used to limit the operate time at high
degrees of overexcitation for
Pickup1
. In case the inverse delay is shorter than
t_MinTripDelay
, OEXPVPH (24) function trips after
t_MinTripDelay
seconds.
1MRK 502 048-UUS A
Section 9
Voltage protection
305
Technical manual
Содержание 650 series
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