Toshiba GRT100 Series Instruction Manual page 214

1. Scheme switch setting of REF element
Type of transformer
1ct-1
1REF
I
n1
HV LV
1nCT 2nCT
1ct-1
HV
1nCT
LV
1ct-2
1ct-1 HV
1nCT
I
n1
1REF
 213 
2ct-1
2REF
I
n2
1REF
I
n1
LV
6 F 2 S 0 7 8 9
Scheme switch setting
[1REF] = 1I0
[2REF] = 1I0
[1REF] = 2I0
2REF1 = OFF
2REF2 = OFF
2REF3 = OFF
2REF4 = OFF
2REF5 = OFF
3REF1 = OFF
3REF2 = OFF
3REF3 = OFF
3REF4 = OFF
3REF5 = OFF
1REF = 1I0