الوصف

Protective current transformers are required to operate over a range of current many times the circuit rating and is frequently subjected to conditions greatly exceeding those which it would be subjected to as a measuring current transformer.When a current transformer is used to energise a protective relay,it must maintain its characteristic ratio up to some multiple of its rated current.This multiple,may be 5,*0,*0 or some even higher value and is known as the Acuuracy Limit Factor(ALF).Therefore,the selection of Protective Transformers in relation to accuracy class and ALFrequrie a close examination of relay characteristic and circuit conditions which includes the relay burden and the pilot wire lead burden.

Primary current(A):*0A****0A
Secondary current:5A,1A
Class:1.0,3.0
Frequency:****0HZ
Rated load:5VA**5VA 

Standard approval:BS***6,IEC**5

Shore-time thermal current:1th=*0x1h

Rated security coefficient:Fs<5

SFIM current transformers comply with the highest international quality standards with professional experience in the industry.SFIM products have built a reputation for quality and modern design at competitive prices.

SFIM current transformers are made according to the IEC***1,BS***8,and DIN ****0 standards.

Case:all cases are made of non-combustible plastic material according to UL**4VO.

Insulation class:E(**0max)

Ambient temperature:**0**5(**5)

Storage temperature:**0**0

Test voltage:4Kveff *0HZ lmin

Operating frequency:*0HZ/*0HZ

Rated secondary current:5A or 1A

Rated burden:1VA,1.5VA,2.5VA,3.*5VA,5VA,7.5VA,*0VA,*2.5VA.,*5VA,*0VA,*0VA,*5VA,*0VA

Accuracy:0.5 for exact measuring.(for kwh measuring),1.0 for general measuring with switch board instruments,3.0 for other not so exact measuring.

Connection:the secondary connections are with two terminals(two terminals for each connection),use M4 or M5 screws to fix which can be handled easily and secure low contacted resistance.

Accessories:the terminal cover is executed to assure the lead seal.This execution complies with the VGB4 protection of DIN****6 standard.

This type current transformer is made according to BS***8 with ABS non-combustible plastic case.