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DEF element
The test circuit is shown in Figure 6.5.6.
Three-phase
voltage
source
A
Single-phase
current
source
+
DC
power
−
supply
DC
voltmeter
DEF elements and their output signal number are listed below.
Measuring element
DEF1F (FWD)
DEF1R (REV)
The following shows the case when testing DEF1F.
• Select "Logic circuit" on the "Test menu" screen to display the "Logic circuit" screen.
• Enter the signal number to be observed at monitoring jack A as shown in Section 6.5.1.
• Apply the rated voltage VT (= V 0 ) and single-phase test current IT.
Set IT to lag V 0 by DEF characteristic angle DEF θ . (The default setting of DEF θ is -45°.)
•
Changing the magnitude of IT while retaining the phase angle with the voltages, and measure
the current at which the element operates. Check that the measured current magnitude is
within ± 5% of the current setting.
DSEF element
The test circuit is shown in Figure 6.5.6.
DSEF elements and their output signal number are listed below.
Measuring element
DSEF1F (FWD)
DSEF1R (REV)
V
φ
Note: Connect the dotted line for current input in DSEF element
Figure 6.5.6
Testing DEF Elements
Signal number
Signal number
⎯
⎯
259
GRD150
TB1
-11
V a
-12
−V 0
V b
-13
-14
V c
-15
-16
Monitoring
jack
TB1
I a
-1
2
-
I e
7
-
-8
-9
I se
-10
TB4
-18
-19
-20
(E)
132
148
136
152
6 F 2 S 0 8 4 2
A
0V
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