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How to choose a current transformer


How to choose a current transformer</a>

Current transformers are used in electrical current measuring systems and relay protection devices for power systems.

The main requirement for such transformers is to ensure high accuracy.

Transformers must also ensure the safety of measurements, which is achieved by isolating the measuring circuit from the circuit with high voltage.

The choice of a transformer requires some calculations.



Before choosing a transformer, you need to find out the required output parameters of the electrical circuit: output voltage (Uv) and load current (Iн).


Calculate the output power of the transformer (Pout) by the formula:
Pout = UB x IH-


Now select the size of the transformer within the calculated power (based on the available product range). Pay attention to the physical dimensions (dimensions) of the transformer.


Transformers Can be in different climatic versions: Sealed and open. Consider this design feature when choosing. It is important to choose the type of execution for the conditions in which the transformer will actually be operated.


Taking into account the possible additional requirements to limit the no-load current, no-load voltage and overheating, it is advisable to take the output power with a margin.


Essential criteria for choosingTransformer will be the presence of a special impregnation and thermal fuse, the features of the device fastening, the types of terminals. Please note that the options for picking different from the basic version may be somewhat more expensive.

How to choose a current transformer Was last modified: May 22nd, 2017 By Vofwuecl
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