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Oil Immersed Current Transformer Current Transformers

PRODUCT INTRODUCTION

This current transformer is an oil-paper insulated type with a metallic expansion bellow, Connection between components uses argon-arc welding, fill in high pressure nitrogen to detect leakage after assembly is complete.

PRODUCT DETAILS

Current transformer LVB product range is based on top core design. It is an oil-paper insulated type with a metallic expansion bellow, Connection between components uses argon-arc welding, fill in high pressure nitrogen to detect leakage after assembly is complete, so oil penetration and oil leakage caused by oil-immersed products are resolved at root. Use an aluminum alloy cast case, all components including the base, connection box, stainless steel expander, and nameplate etc do not rust forever. It is outdoor, single phase, and oil-immersed to-head type, which is used for metering and relay protection of 220kv, 50 or 60Hz system. It is a reliable product with minimum maintenance and suitable for wide range of environmental conditions.

This product is light and handy with a small volume and light weight and meets the requirement of horizontal transportation.

Sihu Oil Type Transformer

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.

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: 5 or 10

Accuracy limited 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: ≤63kA/3s

Rated dynamic: ≤160kA

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

≥410

≥1256

66

≥720

≥2248

110

≥1010

≥3906

132

≥1160

4495

150

≥1350

5270

220

≥2010

≥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 ligtning 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

 

The demonstration of the oil immersed current transformer

                                                       Table 4

Rated Voltage

A (mm)

B (mm)

C (mm)

D (mm)

E (mm)

35

785

1463

475

790

20

66

785

1712

475

790

20

110

785

2212

475

790

20

132

878

2375

450

790

20

150

878

2675

450

790

20

220

881

3652

600

760

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.

 

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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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