Dry type composite capacitive type current transformer

■ Product features
· Non-porcelain,non-gas,unfilled oil
· Fire proof,explosion proof
· Maintenance-free
· Smaller volume,lighter weight
· Ambient air temperature form -40 ℃ to +50℃

■ Technical parameters
· Highest voltage：35~220kV
· Rated frequency：50Hz、60Hz
· Rated primary current：25~5000A
· Rated secondary current：1A、5A
· Measuring winding accuracy class：0.2S,0.2,0.5S,0.5
· Protective winding accuracy class：5P,10P,
· Rated output：5~50VA Instrument security factor：5,10
· Accuracy limit factor：5,10,15,20,25,30,40

■ Environment condition
· Installation environment：indoor or outdoor
· Ambient air temperature：-40~+50℃
· Altitude：1000m（confering with consumer if above 1000m）
· Pollution class： Ⅱ、Ⅲ、Ⅳ

■ Main performance
· The main performance of the product can satisfy the requests of  GB/T 20840 《Current transformers》and IEC 61869《Instrument transformers》.
· Rated insulation level and partial discharge level

· Dielectric loss factor
Dielectric loss factor is not greater than 0.005 under 10kV and 1.05Um/√3kV(ambient air temperature 10~40℃).
· Temperature rising limit
The highest temperature rising of winding is not greater than 75K.
· Rated short-time thermal current is twenty-five times rated current when time keeps up 1 second.
 · Request of mechanical strength can satisfy the requests of  GB/T 20840 《Current transformers》and IEC 61869《Instrument transformers》.

■ Acceptance and maintenance
Every dry type high voltage current transformer has passed tests including power frequency withstand voltage,partial discharge,dielectric loss factor,terminal withstand voltage,sign examination,insulation resistance,error measuring before leaving the factory. We follow up GB50150 《Standard for hand-over test of electric equipment electric equipment installation engineering》when the products are handed over. In generally,the products need no maintenance basically.It is enough to check the primary winding capacity and dielectric loss factor every 2~3 years.

■ Transportation and installation 
· The products should be packed by shockproof material when they are transported.
· Pay attention to the silicon rubber umbrellas when the products are suspended.
· Documents：certificate,test report,product manual.They should be put into packing box with the products.
· Please earth reliably the terminal of the products after installing.

■ Notice for order
You should specify the following parameters at least when ordering：
· Primary parameters：highest voltage,rated current ratio,short-time thermal current and dynamic current, creepage distance.
· Secondary parameters：number of secondary winding,tapped case,accuracy class and load,instrument security factor and accuracy limit factor,accuracy limit condition of transient protective winding.
· Environment condition：ambient air temperature,altitude,pollution class.
We can offer the special products too.