Toshiba GRT100 Series Instruction Manual page 120

6.5.1.2 2F element
The testing circuit is shown in Figure 6.5.5.

Current
I 1
source

50 or 60Hz

Current
I 2
source

100 or 120Hz

DC
power

supply

DC
voltmeter

The output signal number of the 2F element is as follows:
 Set the second harmonic restraint setting k2f to 15%(= 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 2F 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 second harmonic current I 2 and measure the value at which the element operates.
 Calculate the percentage of the second harmonic by I 2 /I 1 when the element operates.
Check that the percentage is within 7% of the k2f setting.
Figure 6.5.5 Testing 2F Element (Model 100s, 200s)
Element Signal number
2F 122
 119 
GRT100
TB 1
-1
I a
-2
Monitoring
jack
TB 4
- A16
- A17
6 F 2 S 0 7 8 9
A
0V