Function
9
Fig. 2.1: Starting sequence
Switch on the test current
in the test winding
Starting sequence
2 s
Calibration
(offset measurement)
2 s
0
.
5 s
X12 = HIGH
Delay
X12 = LOW
0
.
05...0
.
1 ms
X12 = HIGH
10...11 ms
X10 < 50 μs
HIGH ?
no
yes
X10 > 5 ms HIGH
?
no
yes
+
U
s
≥
11 V
?
yes
yes
no
no
+
U
s
≥
11 V
?
X10 > 100 μs
HIGH ?
Ja
no
+
U
s
≥
5 V
?
no
yes
Switch off the test current
in the test winding
0
.
1 s
2
.
0 s
0
.
1 s
Start ∆ I measurement
Test current
measurement
