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126kV Current Transformer (SF6)CT

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126kV Current Transformer (SF6)CT Product Details:

126kV Current Transformer (SF6) CT
Current transformer (CT) is used for measurement of electric currents. When current in a circuit is too high to directly apply to measuring instruments, a current transformer produces a reduced current accurately proportional to the current in the circuit, which can be conveniently connected to measuring and recording instruments. Current transformer also isolates the measuring instruments from what may be very high voltage in the monitored circuit. It commonly used in metering and protective relays in the electrical power industry.

According to the insulation medium, the current transformer can be divided in to SF6 CT and Oil immersed CT.

The SF6 current transformer is inverted type and is composed by the shell, main body, insulation bushing and foundation, which is insulated by SF6 gas.



IEC-60044 Instrument transformers

GB1208-2006 Current Transformer



Ø   Rationale insulation structure

Ø   Reliable main insulation and seldom be aging

Ø   No fire and bombing hazard

Ø   Reliable stability of short-circuits (stable dynamic thermal)

Ø   Convenient operation and easy maintenance


Application: the current transformer is for the use of current measurement, electrical metering and relay protection in power system.


Typical specification:

Ø   Type: SF6 Current transformer

Ø   Highest system voltage: 126kV

Ø   Rated frequency: 50Hz

Ø   Rated power frequency withstand voltage (r.m.s):230kV

Ø   Rated lighting impulse withstand voltage (peak): 550kV

Ø   Rated primary current:100~2500A

Ø   Rated secondary current:5 or 1A

Ø   Accuracy classes: 0.2; 0.2S;0.5;0.5S;5P;10P;

Ø   Rated output:15~60VA

Ø   Instrument security factor(FS):5;10

Ø   Accuracy limit factor(ALF): 10;15;20

Ø   Short time thermal current: 31.5~63/3 KA/s

Ø   Rated dynamic stable current: 80~160KA

Ø   SF6 rated pressure: 0.4MPa

Ø   SF6 refilled pressure: 0.35MPa

Ø   SF6 annual gas leakage ratio: ≤0.5%

Ø   SF6 moisture content: ≤150μL/L

Ø   Outer dimension: 2150*1213*1870mm

Ø   Product weight: 400~500KG

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