Indoor current transformers bushing type ТПЛ-20 (TPL-20) and ТПЛ-35 (TPL-35)

Indoor current transformers bushing type ТПЛ-20 (TPL-20) and ТПЛ-35 (TPL-35)

Indoor current transformer TPL-20Description

The transformers are intended for transmitting measuring information signal to measuring instruments and to protection and monitoring devices, as well as for insulation of secondary connection circuits from high voltage in alternately current electrical appliances for voltage class up to 20 kV - TPL-20; up to 35 kV - TPL-35. The transformers are built in factory-assembled switchgears of the inside and outside device (KRU).
The transformers for differential protection are delivered at the special order.
The transformers are manufactured in climatic versions "YXL"(temperate outside mounting) and "T"(tropical) according to the standard requirements of GOST 15150 location category 2 and are intended for usage under the following operating conditions:

the altitude above sea level is not higher than 1000 m; the ambient air temperature is given in the table; 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

Value

Rated voltage, kV

20

35

Maximum operating voltage, kV

24

40,5

Rated primary current, A

300, 400, 600, 800, 1000, 1500, 2000, 3000, 4000

300, 400, 600, 800, 1000, 1500

Number of secondary windings

2

2

3

4

Rated secondary current, A

1; 5

AC current frequency, Hz

50 or 60

Rated secondary burden at cos φ = 0,8 , VA:

of the winding for measurement
of the winding for protection

 

3; 5; 10; 15; 20; 25; 30; 50 * (20)
3; 5; 10; 15; 20; 25; 30; 50 * (20)

Accuracy classes of secondary windings:

for measurement:
for protection:

 

0,2S; 0,2; 0,5S; 0,5; 1
5P; 10Р

Short-circuit current ratio of the winding for protection, at the given primary current, A, no less than:

300

10

13

400

13

600

18

800

24

1000

24

1500

26

2000

26

-

3000 15 -

4000

14

-

Instrument security factor of the winding for measurement in accuracy class:
0,2S; 0,2; 0,5S; 0,5; 1, at the given primary current, A, no more than:

300-1500
2000; 3000
4000

 

 






10
10
13

 




10
-
-

Three second thermal current, kA, at the given primary current, A

300

16

12

400

16

600

24

800

32

1000

40

1500

60

2000

60

-

3000 80 -

4000

100

-

Dynamic current, kA, at the given primary current, A:

300

41

31

400

41

600 

61

800

82

1000

102

1500

153

2000

153

-

3000 204 -

4000

255

-

Test voltage, kV:

of industrial frequency, during one minute
of lighting impulse

 

65
125

 

95
220

Notes:
*Should be specified in the order. Standard burdens are shown in brackets.

Table 2

Type

Dimensions, mm

Pic.

L

L1

B

B1

TPL-20

770

540

240

40

1

TPL-35

990

760

410

TPL-35-3

1060

830

480

112

2

TPL-35-4

3

Table 3

Rated primary current, A S, mm Weight, kg max
TPL-20 TPL-35
TPL-35-3
TPL-35-4
TPL-20 TPL-35 TPL-35-3 TPL-35-4
300; 400; 600 6.5 47 60 74 79
800 9.5
1000 11.5
1500 18 62
2000 18 - - - -
3000; 4000 20

General view of transformer (drawing)