CT Accuracy Class
CT Accuracy Class
(OP)
Hi,
Found on the nameplate of a CT (Gas Insulated Switchgear of Japanese make):
CT Ratio – 2500/1 A
Turns ratio – 1/2500
Accuracy class – 0.03X700R6
Can you please explain this accuracy class? I guess, CT class is X and 0.03A is mag current at knee point voltage 700V and winding resistance is less than or equl to 6 ohm.
Other CT has
CT Ratio – 3000/1 A
Turns ratio – 1/3000
Accuracy class – 0.02X250R5
Thanks.
Found on the nameplate of a CT (Gas Insulated Switchgear of Japanese make):
CT Ratio – 2500/1 A
Turns ratio – 1/2500
Accuracy class – 0.03X700R6
Can you please explain this accuracy class? I guess, CT class is X and 0.03A is mag current at knee point voltage 700V and winding resistance is less than or equl to 6 ohm.
Other CT has
CT Ratio – 3000/1 A
Turns ratio – 1/3000
Accuracy class – 0.02X250R5
Thanks.






RE: CT Accuracy Class
The numbers represented max exciting current, minimum knee point voltage and maximum secondary winding resistance corrected to 75°C, in that order.
Does the nameplate state a standard?? I am familiar with the Japenese JIS series but do not recall ever seeing that format. Could be JEC-xxxx??
RE: CT Accuracy Class
<=0.03 A Iexc
>=700 Vkp
<= 6 ohms Rs