Toshiba GRT100 Series Instruction Manual page 121

6.5.1.3 5F element
The testing circuit is shown in Figure 6.5.6.

Current
source I 1

50 or 60Hz

Current
I 2
source

250 or 300Hz

DC
power

supply

DC
voltmeter

The output signal number of the 5F element is as follows:
 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.
Figure 6.5.6 Testing 5F Element (Model 100s, 200s)
Element Signal number
5F
 120 
TB 1
-1
-2
TB 4
- A16
- A17
123
6 F 2 S 0 7 8 9
GRT100
I a
A
Monitoring
jack
0V