Bushing current transformer TВ (TW) for outside mounting

Bushing current transformer TВ (TW) for outside mounting

Description

There is a need for new build-in transformers with high accuracy classes for accurate calculation of electrical energy. There are a number of problems which limit usage of build-in transformers. These are:

  • long and labor-intensive mounting;
  • limited period during which mounting may be done;
  • it is impossible to use them in relay protection schemes;
  • need in regular alignment of switchbreaker after the transformer is mounted and so on.

Usage of detached current transformers with measuring windings of high accuracy class may also be problematic, because the territory of power plants is limited (and there is not always possible to mount extra transformers), as well as mounting such transformers may be quite expensive. The solution to this problem is our current transformer of outside mounting TV-110-IX.
TV-110-IX gives you:

  • fast mounting in any time of the year;
  • high accuracy classes (0,2S; 0,2; 0,5S; 0,5) provide accurate calculation of electrical energy;
  • there is no need to remove previously mounted current transformers - there is no need to realign relay protection;
  • reasonable price. 

Installation scheme of current transformer TV-110-IX on high-voltage lead terminal of switch breaker

Mounting of transformer

Legend:

1 - Switch breaker
2 - High-voltage lead terminal
3 - Build-in current transformer TV for protection
4 - Measuring current transformer TV-110-IX 

Outdoor current transformer TW-35-IX 

 

Table 1. Tachnical data of transformer TW-35-IX

Type

Transformer ratio

Accuracy class

Rated secondary burden at cosφ = 0,8, ВА

Three-second thermal current, kA

Weight, kg

TW-35-IX

100/5

1

5

50*

28±2

150/5

0,5S

5

200/5

0,5S

10

300/5

0,5S

30

400/5

0,2S

10

500/5

0,2S

15

600/5

0,2S

20

750/5

0,2S

30

800/5

0,2S

40

1000/5

0,2S

50

1200/5

0,2S

100

1500/5

0,2S

100

2000/5

0,2S

100

3000/5

0,2S

100

100/1

1

5

150/1

0,5S

5

200/1

0,5S

10

300/1

0,5S

30

400/1

0,2S

10

500/1

0,2S

15

Notes:

*) Thermal current for a given type is given for the winding closed at rated burden.

On demand transformers may be manufactured with different technical parameters.

General view of transformer (drawing)

Outdoor current transformers TW-110-IX and TW-110-IX-1

 

Table 1. Technical data of transformers TW-110-IX and TW-110-IX-1

Type
Transformer ratio Transformer ratio on different tappings
Accuracy class
Secondary burden at cos φ = 0,8, VA
Short-circuit current ratio
Instrument security factor
Three-second thermal current, kA (ratio)
Weight, kg

 TW-110-IX

TW-110-IX-1

 400/1 100/1
 1,0  5  -  10***  50*  35±2
 150/1  0,5  5  -
 1  10  -
 300/1  0,5S  10  -
 0,5  15  -
 400/1  0,5S  20  -
 600/1  200/1  0,5S  5  -
 0,5  10  -
 300/1  0,5S  10  -
 0,5  15  -
 400/1  0,5S  20  -
 600/1  0,2S  10  -
 0,5S  30  -
 1000/1  500/1  0,5S  20  -
 600/1  0,5S  30  -
 750/1  0,5S  50  -
 1000/1  0,2S  30  -
 600/5  200/5  1  10  -
 300/5  0,5  10  -
 400/5  0,5S  10  -
 0,5  15  -
 600/5  0,5S  30  -
 1000/5  500/5  0,5S  15  -
 600/5  0,5S  30  -
 750/5  0,5S  50  -
 1000/5  0,2S  20  -
 0,5S  75  -
 1500/5  750/5  0,5S  50  -
 1000/5  0,2S  20  -
 0,5S  75  -
 1200/5  0,2S  30  -
 0,5S  75  -
 1500/5  0,2S  50  -
 3000/5  1000/5  0,5S  75  -
 1500/5  0,5S  100  -
 2000/5  0,2S  50  -
 3000/5  0,2S  100  -

 

Type
Transformer ratio
Transformer ratio on different tappings Accuracy class
Secondary burden at cos φ = 0,8, VA Short-circuit current ratio Instrument security factor Three-second thermal current, kA (ratio) Weight, kg

TW-110-IX

TW-110-IX-1

600/5 200/5
10Р
10
14
-
(25)
45±2
300/5
10Р
10 19
-
400/5
10Р
15
19
-
600/5
10Р
15
23
-
1000/5 500/5
10Р
10
25
-
600/5
10Р
15
23
-
750/5
10Р
20
23
-
1000/5
10Р
25
25
-

Notes

1* Thermal current for a given type is given for the winding closed at rated burden.

2 ** Variation of transformer intended for protection.

3 ***Instrument security factor no more than 10 at highest of given secondary burdens.

4 On agreement with customer current transformers may be manufactured with other technical parameters.

General view of transformer TW-110-IX (drawing)

General view of transformer TW-110-IX-1 (drawing)

Outdoor current transformer TW-110-IX-3

 Таблица 1. Технические характеристики трансформатора ТВ-110-IX-3 (0,5S(0,2S)/10P(5P)/10P(5P)) трехобмоточный

Rated primary current, A

Rated secondary current

Rated burden of a winding for protection at cos φ = 0.8, VA

Short-circuit current ratio of a winding for protection, no less than

Rated secondary burden of a winding for measurement at  cosφ = 0.8, VA

Accuracy class of a winding for measurement

Three-second thermal current (ratio)

200

5

10

13

5

0,5S

52

300

10

19

10

0,5S

400

15

18

25

0,5S

500

15

22

50

0,5S

600

20

20

50

10

0,5S

0,2S

750

25

20

50

15

0,5S

0,2S

1000

30

20

50

30

0,5S

0,2S

36

1200

30

23

50

0,2S

1500

30

26

50

0,2S

2000

30

31

100

0,2S

200

1

10

13

5

0,5S

46

300

10

19

10

0,5S

400

15

18

25

0,5S

500

15

22

50

0,5S

600

20

20

50

10

0,5S

0,2S

750

25

20

50

15

0,5S

0,2S

1000

30

20

50

30

0,5S

0,2S

1200

30

23

50

0,2S

Notes: on agreement with customer current transformers may be manufactured with other technical parameters.

General view of transformer (drawing)

Outdoor current transformers TW-220-IX

Table 1. Technical data of TW-220-IX

Type

Transformer ratio

Accuracy class

Secondary burden at cos φ = 0.8, VA

Three-second thermal current, kA

Weight, kg

TW-220-IX

200/5

0,5

5

50*

102±2

300/5

0,5S

10

400/5

0,5S

20

500/5

0,5S

30

600/5

0,5S

50

750/5

0,5S

50

1000/5

0,2S

25

1200/5

0,2S

40

1500/5

0,2S

50

2000/5

0,2S

50

200/1

0,5

5

300/1

0,5S

10

400/1

0,5S

20

500/1

0,5S

30

600/1

0,5S

50

750/1

0,5S

50

1000/1

0,2S

25

1200/1

0,2S

40

1500/1

0,2S

50

2000/1

0,2S

50

Notes

1* Thermal current for a given type is given for the winding closed at rated burden.

2 On agreement with customer current transformers may be manufactured with other technical parameters.

General view of transformer (drawing)