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Gas Insulation Inductive Voltage Transformers Inductive Voltage Transformers

PRODUCT INTRODUCTION

The inductive voltage transformers which the insulation material is SF6 gas. The bushing of the voltage transformer is made by silicon rubber or porcelain.

PRODUCT DETAILS

The inductive voltage transformers which the insulation material is SF6 gas. The bushing of the voltage transformer is made by silicon rubber or porcelain. There are some aluminium electrodes inside the voltage transformer, to improve the electric field distribution inside the voltage transformer. There is a pressure relief device at the top of the voltage transformer, when the pressure is more than 0.8MPa (1.0 MPa only for 500 kV) if the voltage transformer is discharge inside, the relief device will be broken to release the pressure and send an alarm information. There is a SF6 density monitor fix at the base, it can indicate the SF6 pressure which inside the voltage transformer (its indicated value is the SF6 pressure at 20℃), and it will provide an information when the SF6 pressure is drop down to the minimum service pressure of the current transformer, to remind the user replenish the SF6 gas to the rated pressure. 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 secondary voltage

a) Measuring secondary winding is 0.1/√3kV, 0.11/√3kV, 0.12/√3kV or 0.15/√3kV

b) Protective secondary winding is 0.1/√3kV, 0.11/√3kV, 0.12/√3kV or 0.15/√3kV

c) Residual voltage winding is 0.1kV, 0.11kV, 0.12kV, 0.15kV

Rated operating pressure of gas SF6 is 0.40MPa (0.50 MPa only for 500 kV); Minimun operating pressure of the gas SF6 is 0.35MPa (0.45 MPa only for 500 kV).

Rated output and relative accuracy class (cosφ=0.8 lag) please see table 1

Table 1

Winding

Measuring Winding

Protective Winding

Residual Voltage Winding

Winding

Measuring Winding

Protective Winding

Terminals Marking

Accuracy Class

1a-1n

2a-2n

3a-3n

Terminals Marking

1a-1n

2a-2n

0.2

0.5

0.5

Accuracy Class

0.2

0.5

Rated Output (VA)

100

Rated Output (VA)

100

150

 

150

Winding

75

100

 

75

Measuring Winding

Protective Winding

Residual Voltage Winding

Winding

Measuring Winding

Protective Winding

Terminals Marking

Accuracy Class

1a-1n

2a-2n

3a-3n

Terminals Marking

1a-1n

2a-2n

0.2

0.5

0.5

Accuracy Class

0.2

0.5

Rated Output (VA)

100

Rated Output (VA)

100

150

 

150

Winding

75

100

 

75

Measuring Winding

Protective Winding

Residual Voltage Winding

Winding

Measuring Winding

Protective Winding

 

Note: Each thermal limit burden for protective winding is 2000VA.

 

Arcing distance and creepage distance of outer insulation please see table 2.

Table 2

Rated voltage(kV)

Arcing distance(mm)

Creepage Distance (mm)

Pollution Level (W1)

Pollution Level (W2)

Pollution Level (W3)

35kV

≥410

≥810

≥1013

≥1256

66kV

≥720

≥1450

≥1813

≥2248

110kV

≥1010

≥2520

≥3150

≥3906

132kV

≥1160

≥2900

≥3625

≥4495

150kV

≥1350

≥3400

≥4250

≥5270

220kV

≥2010

≥5040

≥6300

≥7812

330kV

≥2360

≥7260

≥9075

≥11253

380kV

≥3323

≥8400

≥10500

≥13020

500kV

≥3980

≥11000

≥13750

≥17050

 

Insulation requirements for the primaries please see table 3.

Table 3

 

Rated voltage (kV) 35 66 110 132 150 220 330 380 500
power-frequency withstand voltage (r.m.s) (kV) 95 160 230 275 325 460 510 630 740
The wet test for the current transformer of power-frequency   withstand (r.m.s) (kV) 95 160 230 275 325 460 510 630 740
Rated switching impulse withstand voltage (peak) (kV) / / / / / / 950 1050 1175
Rated lightning impulse withstand voltage (peak) (kV) 200 325 550 650 750 1050 1175 1425 1550
chopped ligtning impulse voltage (peak) (kV) 230 343 635 750 865 1208 1351 1640 1930
power-frequency withstand voltage at the SF6 gas pressure 0MPa   (kV) 30 54 95 109 128 190 272 315 413
Partial discharge level prestressing   performed voltage (r.m.s) (kV) 76 112 184 220 260 368 408 504 592

Test voltage 1.2Um or Um (kV)

PD≤10pC

49 87 126 145 170 252 363 420 550

Test voltage 1.2Um/√3 (kV)

PD≤5pC

28 50 87 100.5 118 174 252 291 381

 

Mechanical requirements for the primary terminals please see table 4.

Table 4

Rated voltage (kV)

35

66

110

132

150

220

330

380

500

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

500

1000

1000

1000

1250

1250

1500

1500

Applied to the primary terminals with duration (s)

60

60

60

60

60

60

60

60

 

Dimensions of the voltage transformers

 

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

Table 5

Rated voltage(kV)

H(mm)

W1(mm)

W2(mm)

D(MM)

35

1050

335

335

16

66

1500

400

400

20

110

1905

450

450

20

132

2150

450

450

20

150

2350

450

450

20

220

3470

600

600

24

330

4150

600

600

24

380

4720

680

680

32

500

5920

750

750

32

Drawing 1  JDQXF-□W outline and installation dimensions

 

 

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