SF6 Current Transformer

SF6 Current Transformer SF6 Current Transformer For CT we have dry, oil, gas, here we mainly introduce our SF6 current transformer, balance types you can check with product list, it will have detailed information for each type and voltage level. The enclosure, locating at the top, could be...

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SF6 Current Transformer

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SF6 Current Transformer

For CT we have dry, oil, gas, here we mainly introduce our SF6 current transformer, balance types you can check with product list, it will have detailed information  for each type and voltage level.

The enclosure, locating at the top, could be divided into “T” shape and “bell-cover” shape. T shaped enclosure is made of anticorrosive aluminum; Bell-cover  enclosure is made of casting aluminum. The enclosure is checked by intensity and gas sealing and X ray. 

The main body (primary winding and secondary winding) is fixed in the enclosure. SF6 is adopted as the insulating medium between the  primary winding and secondary winding in which has the shield tube supported by epoxy resin for the secondary winding. The outgoing line for the secondary winding is lead to the connection box in pedestal through down-lead  tube. 
The insulating tube, dividing into porcelain tube that is sintered by high-strength porcelain and silicon-rubber tube, and silicon-rubber porcelain which has better performances in resisting pollution, water invasion  and electric corrosion comparing with that high-strength porcelain. 
The pedestal is designed with connection box,SF6 gas density controller and gas filling valve. The Sf6 gas density controller provideds the functions  as temperature compensation, alarm and remote monitor to the gas pressure.

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Rated voltage, kV

33 or 35

66 or 69

110 or 115

132 or 138

150

220 or 230

Highest voltage for equipment, kV

33 or 40.5

72.5

123 or 126

145

170

245 or 252

Rated frequency, Hz

50; 60

Rated power frequency withstand voltage, kV

95

160

230

275

325

460

Rated lightning impulse voltage, kV

200

350

550

650

750

1050

Flashover distance, mm

385

700

1100

1300

1500

2100

Cree. distance, mm

W1 W2 W3

810

1020

1260

1450

1820

2250

2520

3150

3910

2900

3630

4500

34000

4250

5270

5040

6300

7820

Mechanical load, N

3000

3000

3000

3000

3000

4000

Rated primary current, A

5~5000

Rated secondary current, A

1;2;5

Accuracy class

0.1; 0.2; 0.5; 0.2S; 0.5S; 0.5S; 5P; 10P; PX…

Rated output(recommended value), VA

1A: 10~30 VA

2A: 10~30 VA

5A: 15~50VA

Instrument security factor  FS

5; 10

Accuracy limit factors  ALF

10; 15; 20; 25; 30; 40

Short-time thermal current (Maximum), kA

50kA/3s

Rated gas pressure 20 ℃, Mpa

0.4

Gas-supply pressure, Mpa

0.35

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