250
6
F
2
S
0
8
3
4
Earth fault element reach test
The test circuit is shown in Figure 6.5.1.2.
Three-phase
voltage
source
A
φ
V
TB1
-12
-11
Va
Single-phase
current
source
DC
voltmeter
-13
-14
TB1
-2
-1
-7
-8
-A16
-A17
E
TB4
Vc
Vb
Ia
3Io
GRZ100
DC
power
supply
+
−
Monitoring
jack
A
0V
Figure 6.5.1.2 Testing Earth-Fault Element
Earth fault elements and their output signal number are listed below.
Measuring element
Signal number
Z1G-A 19
Z1XG-A 22
Z2G-A 25
Z3G-A 28
Z4G-A 31
ZFG-A 593
ZR1G-A 569
ZR2G-A 573
ZNDG-A 597
PSBGIN-A 561
PSBGOUT-A 565
•
Press 5 (= Logic circuit) on the Test screen to display the Logic circuit screen.
•
Enter a signal number to be observed at monitoring jack A and press the ENTER key.
•
Apply three-phase rated voltage.
•
Choose a test current IT by referring to the table below, the table shows the relationship
between the reach setting, test current and measuring error.
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