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Oil Immersed Current Transformers Current Transformers

PRODUCT INTRODUCTION

The current transformers which the insulation material is oil. It’s vertical structure, assembled by a metal expander, high voltage porcelain bushing, pressure relief valve, oil tank and oil-letting valve.

PRODUCT DETAILS

The current transformers which the insulation material is oil. It's vertical structure, assembled by a metal expander, high voltage porcelain bushing, pressure relief valve, oil tank and oil-letting valve. The primary winding whose main insulation is made up of crepe paper and capacitor screens. The secondary winding are through the primary winding and are fixed inside the oil tank together. The secondary terminals block is casted by epoxy resin, the frame of the secondary terminals box is a seal structure, it suits for outdoor.

Service Conditions

Ambient air temperature: maximum 40℃, minimum -40℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

Altitude: The altitude does not exceed 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’ requriments).

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

The maximum wind speed does not exceed 34m/s.

Eerthquake intensity does not exceed 8 degree.

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.

 

Technical Parameters

Rated frequency is 50Hz or 60Hz

Rated primary current: 10~4000 A

Rated secondary current: 1, 2 or 5 A

Rated output: 10~60VA

Instrument security factor (FS) for metering cores: 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 protection cores: 5P, 10P, PR, PX, TPS, TPX, TPY, TPZ or C10, C20, C50, C100, C200, C400, C800

Rated frequency: 50Hz or 60Hz

Ambient air temperature: -40 ℃~50 ℃

Altitude: <1000m, if need to design exceed 1000m, please declare in the order.

Rated short-time thermal current: up to 50 kA, 3s; rated dynamic current: up to 125 kA (the actual data shall be corresponding with primary current).

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

 

Table 1

 

Rated voltage

(kV)

Arcing distance

(mm)

Creepage Distance (mm)

Pollution Level (W1)

Pollution Level (W2)

Pollution Level (W3)

35

≥410

≥810

≥1013

≥1256

66

≥720

≥1450

≥1813

≥2248

110

≥1010

≥2520

≥3150

≥3906

132

≥1160

≥2900

≥3625

≥4495

150

≥1350

≥3400

≥4250

≥5270

220

≥2010

≥5040

≥6300

≥7812

330

≥2360

≥7260

≥9075

≥11253

380

≥3323

≥8400

≥10500

≥13020

500

≥3980

≥11000

≥13750

≥17050

 

Insulation requirements for the primaries please see table 2.

Table 2

Rated voltage (kV)

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

35

95

66

160

230

275

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

95

160

230

275

Rated switching impulse withstand voltage (peak) (kV)

Rated lightning impulse withstand voltage (peak) (kV)

200

325

550

650

chopped ligtning impulse voltage (peak) (kV)

230

373

635

750

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

30

54

95

109

Partial discharge level

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

76

112

184

 

Test voltage 1.2Um or Um (kV) PD≤10pC

49

87

126

 

Test voltage 1.2Um/√3 (kV) PD≤5pC

28

50

87

Rated voltage (kV)

35

66

110

132

 

Mechanical requirements for the primary terminals please see table 3.

Table 3

Rated voltage (kV)

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

35

Load

66

1250

2000

 

Load

2500

3000

Applied to the primary terminals with duration (s)

60

60

60

Rated voltage (kV)

35

66

110

132

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

Load

1250

2000

 

Load

2500

3000

Applied to the primary terminals with duration (s)

60

60

60

Rated voltage (kV)

35

66

110

132

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

Load

1250

2000

 

Load

2500

3000

 

Dimensions of the Current Transformers

 

The outline and installation dimensions please see drawing 1~2, and the dimensions of the primary termanils please see table 4~5.

Drawing 1                                                      Drawing 2

 

1 Oil viewing window   2 Primary terminals   3 Porcelain isolator

4 Earthing Terminal   5 Secondary terminals box  6 Nameplate

 

Table 4

Rated Voltage A (mm) B (mm) C (mm) D (mm) E (mm) Drawing No.
35 785 1463 475 790 20 1
584 1770 258 424 14 2
66 785 1712 475 790 20 1
630 1800 410 630 18 2
110 785 2212 475 790 20 1
654 2450 475 710 20 2
132 878 2375 450 790 20 1
654 2750 475 710 20 2
150 878 2675 450 790 20 1
654 3050 475 710 20 2
220 881 3652 600 760 24 1
896 375 520 880 24 2

Notes: 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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