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Current Transformers for GIS Current Transformers

PRODUCT INTRODUCTION

The current transformers match 35~1000kV high voltage switchgears are including the current transformers for outdoor of busbar going through with the stainless steel or aluminium cases, secondary windings with the insulating material wound, casted by epoxy resin with the flanges, installed with the enclosures and so on. The shapes, dimensions, technical parameters and service environments can be designed according to the requirements of the clients.

PRODUCT DETAILS

The current transformers match 35~1000kV high voltage switchgears are including the current transformers for outdoor of busbar going through with the stainless steel or aluminium cases, secondary windings with the insulating material wound, casted by epoxy resin with the flanges, installed with the enclosures and so on. The shapes, dimensions, technical parameters and service environments can be designed according to the requirements of the clients.

The current transformers match 35~1000kV high voltage switchgears are including the current transformers for outdoor of busbar going through with the stainless steel or aluminium cases, secondary windings with the insulating material wound, casted by epoxy resin with the flanges, installed with the enclosures and so on. The shapes, dimensions, technical parameters and service environments can be designed according to the requirements of the clients.

Surface: There are different kinds of the current transformers for GIS according to the requirements of the clients, the the surface of the current transformers which used in SF6 gas are wound by insulating tap, casted by epoxy resin or casted with the flanges by epoxy resin; the the surface of the current transformers which used in air are casted by indoor or outdoor epoxy resin, printing after casted by epoxy resin, or closed by the metal enclosures.

The current transformers which used in SF6 gas are manufactured in the constant temperature, humidity and clean room, then dry and vacuum, the moisture contained is very low, they can be used inside the pressure vessel of GIS directly without dry by the clients; they are very clear and can match the cleaning requirement of the GIS.

There is good aging resistivity for the current transformers which casted by indoor or outdoor epoxy resin or printing after casted by epoxy resin used in the air.

There is good agglutinate strength of metal and secondary windings which joined by epoxy resin for the current transformers which closed by the metal enclosures, the protection degree can reach IP66, and there is the function of preventing condensation for the secondary termanils box.

Protection of products: The current transformers which used in SF6 gas should be packed by vacuum to prevent moisture, and be cushioned to prevent damnify during transportation.

The current transformers which used in the air should be packed by the plasic film to prevent moisture, and be cushioned to prevent damnify during transportation.

 

Technical parameters

 

The other technical parameters please see table 1.

Table 1   Technical parameters table

Rated Frequency

(Hz)

Rated Primary Current

(A)

Rated Secondary Current

(A)

Accuracy Classes Combination

Instrument Security Factor

Rated Output

cosΦ= 0.8

(VA)

Rated Voltage

(kV)

50

60

50~4000

5

1

0.2S

0.2

0.5S

0.5

5P5~5P70

10P5~10P70

PX

PR

TPS

TPX

TPY

TPZ

5

10

15

20

25

5~60

0.66

Note: These are the routine parameters in the above table, if there is any different parameters required, we can design according to the technical parameters of the clients.

 

Service conditions

 

Ambient air temperature: -60 ~ 80℃.

Altitude: ≤3000 m.

Service environments: it can be used in the air, vacuum, SF6, or oil.

The average relative humidity in a month: ≤90 %.

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.

 

 

Drawing 1   CTs for GIS (casted with the flanges) outline and installation dimensions

 

Table 1   Dimensions of drawing 1

Symbols of drawing 1

Dimension of each product type

(mm)

66kV

110~150kV

220kV

B

Φ115

Φ140

Φ220

C

Φ285

4

Φ316.4

4

Φ550

4

D

Φ255

Φ273

Φ478

E

Φ552

Φ593.5

Φ1060

H

280

380

144

344

445

325

460

585

Note: These are the routine dimensions in the above table, if there is any different dimensions required, we can design according to the the clients.

 Drawing 2   CTs for GIS (casted by epoxy resin with flanges) outline and installation dimensions

 

Table 2   Dimensions of drawing 2

Symbols of drawing 2

Dimension of each product type

(mm)

66kV

110kV

220kV

330kV

B

Φ115

Φ136

Φ220

Φ255

D

Φ242

Φ260

Φ478

Φ532

E

202

215

380

410

F

210

230

305

325

H1

402

565

465

953

665

1025

725

1085

H2

510

673

565

1053

825

1185

885

1245

Note: These are the routine dimensions in the above table, if there is any different dimensions required, we can design according to the the clients.

 Drawing 3   CTs for GIS (closed by the metal enclosures) outline and installation dimensions

 

Table 3   Dimensions of drawing 3

Symbols of drawing 3

Dimension of each product type

(mm)

500kV

750kV

1000kV

B

Φ415

Φ670

Φ870

C

Φ680

Φ840

Φ1080

D

Φ770

Φ1160

Φ1390

E

519

705

830

F

940

1290

1530

H

520

780

1040

650

900

1150

755

1005

1255

                   

Note: These are the routine dimensions in the above table, if there is any different dimensions required, we can design according to the the clients.

 

 

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