Types of current transformers and criteria for their choice - Trinity option - science

Transformers are used to convert the current. With their help, you can separate the power circuits from protective, connect electricity meters in networks with high working currents, if this is not possible to do this, as well as to perform other tasks. Transformers are of different types. Each of them has their own characteristics, which should be taken into account when choosing.

Classification of current transformers

There are several classifications of current transformers . They take into account different factors, the main of which is the purpose and place of installation, working voltage.

Appointment

Depending on the purpose of the device, they are divided into transformers:

• for measurement;
• for protection;
• Intermediate - for connecting measuring equipment in automatic protection circuits with the inclusion of relay, for leveling currents in circuits, etc.;
• used in laboratories - high -precision and with a large number of transformation coefficients.

Work voltage

Depending on the size of the operating voltage, the transformers are divided into devices:

• with a nominal value of over 1000 volts;
• with a nominal value up to 1000 volts.

Place of installation

Depending on the features of the installation, the transformers are divided into:

• installed outside;
• installed inside;
• invoices - are applied to the passage insulator;
• Portable - for testing in the laboratory and conducting control measurements.

Cross selection criteria for current transformers

When choosing a current transformer, it is necessary to take into account several criteria. The main of them:

• secondary load power;
• primary current;
• Nominal operating voltage.

Power of the secondary load

This criterion is important to take into account when choosing a transformer. The buyer should make sure that the nominal secondary power will exceed the calculated secondary load.

Nominal operating voltage

The nominal operating voltage in the volts can be 0.66, 3, 6, 10, etc. The value should be equal to or exceed the nominal value of the electrical installation for which the current transformer is acquired.

Primary current

This indicator should exceed the values ​​of the rated current of electrical equipment for which the current transformer is selected. It is important to take into account when buying and overload abilities.

The current transformers are distinguished by the purpose, the working voltage indicator and other factors. Finding such devices will not be difficult in the Promindex service catalog. With it, you can quickly choose the desired transformer.