Built-in current transformers are used to work inside the structure of other devices, for example, in the design of gas-insulated tank circuit breakers, power transformers, switchgears or others that provide isolation of the transformer from the high voltage circuit in electrical AC networks. The transformer is intended for operation in areas corresponding to the climatic version of the transformer, non-explosive environment that does not contain corrosive gases and vapors in concentrations that destroy metals and insulation according to GOST 15150.

The transformer ensures:

1) Proportional conversion of alternating current in a high voltage circuit to a current acceptable for direct measurement using standard gauges or protection devices;

2) Isolation of measuring devices and protection devices (due to the design of the device), to which the staff has access, from a high voltage circuit.

Technical Specifications

Parameters

Value

TVG-UETM®-35

TVG-UETM ®-110

TVG-UETM ®-220

TVG-UETM ®-330

TVG-UETM®-500

1 Rated voltage *, kV

35

110

220

330

500

2 Maximum operating voltage *, kV

40,5

126

252

363

525

3 Nominal frequency, Hz

50 or 60

4 Rated primary current, A

from 5 to 6000

5 Rated secondary current, A

1, 2 and 5

6 Number of taps from the secondary windings

from 0 to 6

7 Short-circuit current parameters:

The highest peak current, kA

The limiting ratio of thermal resistance current (КТ)

The duration of the short circuit current, s

 

from 0 to 160

 

from 0 to 250

 

1, 3

8 Climatic modification in accordance with GOST 15150

У, УХЛ, ХЛ, Т

9 Location category acc. to GOST 15150

2

10 Average service life of the transformer, years, not less

40

* Provided due to isolation of the device.

 

Metrological Characteristics

Application

Accuracy acc. to PNST-283, GOST 7746, IEC 61869-2

Nominal secondary load, V А

Instrument safety factor

Nominal limit frequency

Commercial accounting or measurement

0,2S; 0,5S; 0,2; 0,5; 1; 3; 5; 10

from 0 to 100

from 2 to 30

-

Protection

1); 10Р1); 5PR2); 10PR2); TPY3); TPZ4)

from 0 to 100

-

from 2 to 250

1) To this accuracy class there are no requirements for accuracy in transient conditions and limitations on residual magnetization.

2) This accuracy class, in addition to the requirements for classes 5P and 10P, is characterized by a residual magnetization requirement, which should not be more than 10% of the saturation flux. Therefore, with the passage of symmetrical short-circuit currents such a current transformer does not go into saturation, and there will be no current distortion in the secondary circuit. After switching off, the transformer does not require demagnetization, since after the cessation of current flow in the windings, the core returns to the state preceding the short circuit.

3) This accuracy class is characterized not only by the requirement for limiting the residual magnetization, similar to the classes 5РR, 10РR, but also by the requirements for the accuracy of the instantaneous value of the current in a transient short circuit mode with a normalized error of no more than 10%. This class allows you to measure the value of short-circuit current taking into account the aperiodic component, fully transforming it into a secondary circuit.

4) This class is characterized by the normalized error of transformation of the periodic component of the short-circuit current. The current transformer of this class limits the transformation of the aperiodic component into the secondary circuit.

 

- The transformer may have branches from part of the turns of the secondary winding. When using these branches, the transformation ratio decreases.

- It is allowed to set the secondary load ranges that differ from the standard ones and expand the range of nominal primary currents in the direction of reduction to 0.1% or in the direction of increase to 150% and 200%, or combine them, for example, from 0.1% to 200%.

 

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