Indoor current transformers support type ТОЛК-6 (TOLK-6) and ТОЛК-6-1 (TOLK-6-1)

Indoor current transformers support type ТОЛК-6 (TOLK-6) and ТОЛК-6-1 (TOLK-6-1)

Indoor current transformer support typy TOLK-6Description

The transformers are intended for embedding in high voltage explosion-proof factory-assembled switchgears  in the networks of 6 kV in coal and slate mines, dangerous in gas and dust. The transformers serve for current measuring, powering of relay protection devices and for checking operational capability of maximum current protection devices in the absence of primary circuit load.

The transformers are produced in climatic version "О" according to the standard requirements of GOST 15150 location category 5.1 and are intended for usage under the following operating conditions:

  • altitude above sea level is not higher than 1000 m; ambient air temperature:
    • within operation period - from minus 10 to plus 45 °C,
    • within transportation period - from minus 50 to plus 60 °C,
    • within storage period - from minus 50 to plus 50 °C;
  • air humidity 98 % at 35 °C without moisture condensation;
  • environment in switchgear - atmosphere of underground coal and slate mines, dustiness - as to "Safety rules of coal and slate mines". Atmosphere corrosivity - as to operation group 7 GOST 15150;
  • avoid direct solar radiation and water; avoid dewfall on the transformer surface; mounting in any position.

The transformer is patented
Patent Certificate №6269

Table 1. Technical Data 

Parameter Value for given type
TOLK-6 TOLK-6-1
Rated voltage, kV 6
Maximum operating voltage, kV 7.2
AC current frequency, Hz 50, 60
Rated primary current, A 10; 15; 20; 30; 40; 50; 75; 80; 100; 150; 200; 300; 400; 600
Rated secondary current, A 5
Accuracy class 1; 5P; 10P 0.2S; 0.2; 0.5S; 0.5
Rated secondary burden, VA 3; 5; 10; 15; 20; (30) 3; 5; (10); 15; 20; 30

Short-circuit current ratio of secondary winding for protection

at rated burden of 15VA
at rated burden of 30VA

 

8
5.5

 

-
-

Instrument security factor of secondary winding for measurement in a given accuracy class, no more:*

0.2S; 0.2; 0.5S
0.5

 

-
-

 

10
16

Rated supply voltage of additional winding, V 100±20 -

One-second thermal current, kA, at a given primary current, A:

10; 15
20
30
40
50
75
80
100
150
200
300
400; 600

 

1.28
1.92
3.2
3.84
5.76
8.32
8.96
12.8
15.36
22.4
35.2
38.4

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

10; 15
20
30
40
50
75
80
100
150
200
300
400; 600

 

3.2
4.8
8.1
9.7
14.7
21.2
22.8
32.6
39
57
89
98

Test voltage, during one minute of industrial frequency, kV 21 32
Weight 10.5±1

Standard rated burden is given in brackets.

*At nominal burden of 10 VA

Burden value and accuracy class should be given in the order.

On demand transformers may have technical parameters different from nominal values.

General view of transformer (drawing)