Technical Data - ABB SPAU 341 C User Manual

Inverse time
characteristic

Technical data

18
T1: The first delay time to start, when the meas-
ured voltage exceeds or falls below the limit
value.
T2: The second delay time to start, when the
first voltage regulation fails.
Both T1 and T2 can be given definite time char-
acteristic or inverse time characteristic. The
minimum time at inverse time characteristic is
1 s, even though T1 and T2 have the setting 0 s.
T1,T2
300
300
250
200
150
150
120
100
90
60
50
30
0
0 1
Fig. 5. Time characteristics of the automatic voltage regulating module SPCU 1D50
Delay time setting range
Operate time accuracy at definite time
characteristic
Operate time accuracy at inverse time
characteristic
Minimum operate time at inverse time
characteristic
Minimum values at which the phase shift
calculation is enabled
The inverse time function is defined by the fol-
lowing expression :
B =
t =
where
U
d
∆U
T
2 3 4
0.0...300 s
±1% of set value or ±250 ms
±250 ms and the inaccuracy appearing,
when the measured voltage varies ±0.4%
1 s
0.04 x I
0.05 x U
U
d
∆U
s
T
(B-1)
2
= U - U , differential voltage
m p
= bandwidth
s
= T1 or T2
5 6
n
n
7 8
B