9.5.2 External CT wiring diagram
Three-phase four-wire system:
Low-voltage three-phase four-wire star, no PT, 3CT:
High pressure three-phase four-wire star, 3PT, 3CT:
VA VB VC VN
图1：低压三相四线星型，3CT，无PT
IB+ IB- IC+ IC-
IA+ IA-
L1
L2
L3
N
L1
L2
L3
N
IB+ IB- IC+ IC-
IA+ IA-
VA VB VC VN
图4：高压三相四线星型，3CT，3PT
Three-phase three wire system:
Low-voltage three-phase three-wire Angle, no PT, 3CT:
Low-voltage three-phase three-wire Angle, no PT, 2CT:
L1
L2
L3
VA VB VC VN
IB+ IB- IC+ IC-
IA+ IA-
图2：低压三相三线，3CT，无PT
L1
L2
L3
IB+ IB- IC+ IC-
IA+ IA-
VA VB VC VN
图3：低压三相三线，2CT，无PT
High pressure three-phase three-wire Angle, 2PT, 3CT:
High pressure three-phase three-wire Angle, 2PT, 2CT:
L1
L2
L3
IB+ IB- IC+ IC-
IA+ IA-
VA VB VC VN
图5：高压三相三线，3CT，2PT
L1
L2
L3
IB+ IB- IC+ IC-
IA+ IA-
VA VB VC VN
图6：高压三相三线，2CT，2PT
Low-voltage three-phase three-wire Angle, no PT, 2CT:
(Current B phase display current value)
High pressure three-phase three-wire Angle, 2PT, 2CT:
(Current B phase display current value)
图7：低压三相三线，2CT，无PT
（电流B相显示电流值）
L1
L2
L3
VA VB VC VN
IB+ IB- IC+ IC-
IA+ IA-
图8：高压三相三线，2CT，2PT
（电流B相显示电流值）
L1
L2
L3
IB+ IB- IC+ IC-
IA+ IA-
VA VB VC VN