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Oil Immersed Current Transformer Current Transformers

PRODUCT INTRODUCTION

This current transformer has a hermetical structure, each sealing surface has been hermetically sealed by oil resistant rubbers. In order to ensure each of connection fastened well and not to make the gaskets compressed too much, all parts of the equipment are sealed up limitedly.

PRODUCT DETAILS

This current transformer has a hermetical structure, each sealing surface has been hermetically sealed by oil resistant rubbers. In order to ensure each of connection fastened well and not to make the gaskets compressed too much, all parts of the equipment are sealed up limited. The equipment is mainly comprised of metallic bellows, device body, porcelain bushing, oil tank, primary winding terminal plate and secondary winding terminal box. The primary winding forms chain type, using the insulation structure of oilpaper.

Service Conditions

a. Outdoor

b. Ambient air temperature: -40 ~ +40℃(average value of the ambient air temperature does    not exceed 30℃ measured during a period of 24h).

c. Altitude ≤1000m(this is the routine requirement, if there is any different requirement, we can  provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requirements).

d. Application: There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material

e. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

f. Max. wind speed ≤34m/s.

g. Earthquake intensity ≤ 7 degree.

Main technical Parameters

Rated frequency:50 or 60Hz

Rated primary current:50 ~ 4000A

Rated secondary current:1 or 5A

Rated output:10~60VA

Instrument security factor(FS) :5 or 10

Accuracy limit factor:10, 15, 20, 30, 40, 50 or 60

Accuracy class for metering cores: 0.2, 0.2S, 0.5, 0.5S, 1 or 0.3, 0.6, 1.2

Accuracy class for protective cores: 5P, 10P, PR, PX, TPS, TPX, TPY, TPZ or C10, C20, C50, C100, C200, C400, C800

Rated short-time thermal current: ≤40kA/3s

Rated dynamic current: ≤100kA

Creepage distance:31mm/kV

Arcing distance and creepage distance of outer insulation please see table 1.

Table 1

Rated   voltage(kV)

Arcing   distance(mm)

Creepage Distance (mm)

35

≥470

≥1256

66

≥720

≥2248

110

≥1350

≥3906

132

≥1500

4495

150

≥1710

5270

220

≥1975

≥7812

 Insulation requirements for the primaries please see table 2.

Table 2

Rated   voltage (kV)

35

66

110

132

150

220

power-frequency   withstand voltage (r.m.s) (kV)

95

160

230

275

325

460

The wet test for the   current transformer of power-frequency withstand (r.m.s) (kV)

95

160

230

275

325

460

Rated switching impulse withstand voltage (peak)   (kV)

Rated lightning impulse withstand voltage (peak)   (kV)

200

325

550

650

750

1050

chopped lightning impulse voltage (peak) (kV)

230

373

635

750

865

1208

power-frequency withstand voltage at the SF6   gas pressure 0MPa (kV)

30

54

95

109

128

190

Partial   discharge level

prestressing performed voltage (r.m.s) (kV)

76

112

184

220

260

368

Test voltage 1.2Um or Um   (kV)  PD≤10pC

49

87

126

145

170

252

Test voltage 1.2Um/√3 (kV)  PD≤5pC

28

50

87

100.5

118

174

 

Mechanical requirements for the primary terminals please see table 3.

Table 3

Rated   voltage (kV)

35

66

110

132

150

220

Mechanical requirements   (horizontal of two directions and vertical) (N)

Load

1250

2000

2000

2000

2500

Load

2500

3000

3000

3000

4000

Applied to the primary terminals with duration (s)

60

60

60

60

60

Dimensions of the Current Transformers

 

Table 4

Rated Voltage

A (mm)

B (mm)

C (mm)

D (mm)

E (mm)

35

584

1770

258

424

14

66

630

1800

410

630

18

110

654

2450

475

710

20

132

654

2750

475

710

20

150

654

3050

475

710

20

220

896

3715

520

880

24

Note: 

There may be any change of the dimensions for the current transformers because of renewing, the clients must basis on the updated drawings.

Contact Us

If you have any questions about our product, please feel free to contact us. We will answer you as soon as possible.

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