Indoor current tarnsformers support and bushing type ТЛ-10 (TL-10)

Indoor current tarnsformers support and bushing type ТЛ-10 (TL-10)

Indoor current transformer TL-10Description

The transformers are intended for transmitting measuring information signal to measuring instruments and/or to protection, automatic control and signaling devices, as well as for insulation of secondary connection circuits from the high voltage in alternate current electric appliances for voltage class 11 kV with the frequency of 50 and 60 Hz. The transformers for differential protection are manufactured at the special order. The transformers are designed for embedding in factory-assembled switchgears.
The transformers are manufactured in climatic versions "У" (moderate) and "T" (tropical) according to the standard requirements of GOST 15150 location category 3 and are intended for usage under the following operating conditions:

  • the altitude above sea level is not higher than 1000m;
  • maximum ambient air temperature, considering the overheating inside KRU compartment: plus 55 °C for "У" version and plus 60 °C for "T" version;
  • minimum ambient air temperature is minus 45 °C for "У" version;
  • the environment should be non-explosive, without corrosive steams in concentrations that are likely to destroy metal or insulation (atmosphere type II as to GOST 15150);
  • mounting in any position.

Transformers are supplied with protective transparent covers for separate sealing of secondary winding's tappings (example of sealing) 

Table 1. Technical data

Parameter

Normal value
Rated primary current, А*

50

100

150

200

300

400

600

800

1000

1500

2000

3000

Rated voltage, kV

10; 11

Maximum operating voltage, kV

12

Rated current frequency, Hz

50; 60

Rated secondary current, A

1; 5

Number of secondary windings**

2 or 3

2

Rated secondary power of the winding with the power coefficient соs φ =0,8, VA

Winding for measurement 

from 3 up to 30 (10)

from 3 up to 30 (20)

Winding for protection

from 3 up to 30 (15) from 3 up to 30 (30)

Rated accuracy class

Winding for measurement

0,2S; 0,5S; 0,5; 0,2

Winding for protection 

10Р***

Mass, kg

Up to 31,5 кА

45±2

41±2

53±2

40 кА

44±2

42±2

Short-circuit current ratio of the winding 10Р

from 2 up to 30

Three-second thermal current, kA

Type of transformer

I

II

III

2,5

5

7,5

10

15

20

31,5

31,5

40

40

-

20

2,5

5

7,5

20

One-second thermal  current, kA

I

II

III

10

20

20

31,5

-

-

40

10

20

40

Dynamic current, kA

I

II

III

51

81

-

-

128

51

128

Test voltage, kV:

of industrial frequency, during one minute
of full lighting impulse

 

42
75

* According to the order it is possible to manufacture transformer with other primary currents.
** 2 windings - TL-10
     3 windings - TL-10-1
*** On demand may be supplied with accuracy class 5P.
Standard secondary burden is show in brackets.

Table 2. Dimensions.

Transformer type

Picture

L, mm

Rated primary
current, A

d,mm

B, mm

TL-10-I

1
2

477
412

50 - 300
400 - 1500

36

190

TL-10-II

1
2

477
412

200 - 300
400 - 1500

55

TL-10-III

1

422

50 - 150

36

135

200; 300

55

2

357

400 - 1500

TL-10-1-I

1, 3
1, 2

477
412

50 - 300
400 - 1500

36

190

TL-10-1-II

1, 3
2, 3

477
412

200 - 300
400 - 1500

55

TL-10-1-III

1, 3

422

50 - 150

36

135

200; 300

55

2, 3

357

400 - 1500

Table 3.

Transformer type Rated primary current, A Pic.
TL-10-II 3000
2000
4
5

General view of transformer (drawing)