Toshiba GRT100 Series Instruction Manual page 197

4. Function test
4.1 Percentage current differential element DIF test
(1) Minimum operating value test
(2) Percentage restraining characteristic test
Tap setting
(3) Operating time test
Tap setting
4.2 2F-lock element check
4.3 5F-lock element check
4.4 High-set overcurrent element HOC test
(1) Minimum operating value test
(2) Operating time test
Tap setting
4.5 Restricted earth fault element REF test
Tap setting
Tap setting Measured current
I 1 Measured current (I 2 )
 I k
 I k
Test current
Tap setting Measured current
Test current
I a Measured current (I n )
 I k
 I k
 196 
Measured time
Measured time
6 F 2 S 0 7 8 9