Toshiba GRT100 Series Instruction Manual page 117

Figure 6.5.2 Current Differential Element (I out - I in Plane)
Figure 6.5.3 shows a testing circuit simulating an infeed from a primary winding and outflow
from a secondary winding.
Infeed current (I

A
Single-phase
current

source
Outflow current
(I )
out

A
Single-phase
current
source


DC
power

supply

DC
voltmeter

Figure 6.5.3 Percentage Restraining Characteristic Test of DIF (Model 100s, 200s)
I out
DF1
ik
0
2+p1
2 kp +
)
in

 116 
DF2
I in
2p1
4 ik
GRT100
TB 1
-1
I
in
- 2
Monitoring
jack
-9
I
out
-10
TB 4
- A16
- A17
E
6 F 2 S 0 7 8 9
A
0V