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6.5.1.3 5F element
The testing circuit is shown in Figure 6.5.6.
Current
source
TB1
DC
voltmeter
TB4
-1
-2
-
A
16
-
A
17
GRT100
DC
power
supply
+
−
Monitoring
j
ack
A
0V
+
−
+
−
Current
source
50 or 60Hz
250 or 300Hz
+
−
I
a
I
2
I
1
Figure 6.5.6 Testing 5F Element (Model 100s, 200s)
The output signal number of the 5F element is as follows:
Element Signal number
5F 123
• Set the fifth harmonic restraint setting k5f to 30%.(= default setting)
• Press 4 (= Logic circuit) on the "Test" sub-menu screen to display the "Logic circuit"
screen.
• Enter a signal number to observe the 5F output at monitoring jack A and press the
ENTER
key.
• Set the fundamental frequency current I
1
to 3 times of ik setting. Change the magnitude of
the fifth harmonic current I
5
and measure the value at which the element operates.
• Calculate the percentage of the fifth harmonic by I
5
/I
1
when the element operates. Check
that the percentage is within 7% of the k5f setting.