Current transformers are used to show the number of values of the current in a circuit, and today it is preferred to be used in some electronic systems.
The high and primary level currents are converted to the secondary, that is, the low-level system, by a suitable type of current transformer.
In addition to the existence of many current transformer types, the selection of these current transformers should also be appropriate. Current transformers have main components such as primary winding, secondary winding, insulation material, and magnetic core.
What are the Types of Current Transformers?
According to the right product features, a current is one of the safety-influencing factors and is therefore very important. MV-compatible current transformers are generally preferred for medium voltage values. In addition, their tanks can be used with power control devices.
Low-voltage current transformers are another type of current transformer. These products also stop execution in series. Considering the benefits it provides, it can be seen that these low-current transformers are preferred by many businesses.
Separable current transformers, on the other hand, are among the types of current transformers that are easy to install. These products can be preferred for places with mounting problems. In addition, it is possible to quickly change the location of these transformers.
Clamp-end current transformers are another type of transformer. This type of current transformer can provide the possibility of installation without cutting the energy consumption in the panel.
- These current transformer restrictions can also be divided into different types according to voltage, construction, and cooling types, and these can be listed as follows:
- a) Low voltage current transformers
- b) High voltage current transformers
- c) Dry-type current transformers
- d) Oil-type current transformers
- e) Busbar-type current transformers
- f) Wound-type current transformers
What are the Current Transformer Types According to the Cooling Type?
Dry Type Current Transformer: Current transformers are insulated with solid insulating materials. Some products such as paper, resin, or pitch are used for this insulation process. These current transformers, which are generally used at low voltage, are preferred as dry type. In addition, although they are quite economical in terms of price, these transformers are difficult and costly to repair.
Oily Type Current Transformer: Oily-type transformers that provide insulation with insulating oil can leak oil. In addition to this, these transformers, which also sweat, are generally preferred as current transformers used at high voltage.
What Are the Types of Current Transformers According to Their Construction?
Busbar Type Current Transformer: Generally, bar-type current transformers are suitable for LV-sized circuits. Often, such transformers have a primary in the form of a winding in the middle section, and some may also have an empty middle section. The bar is passed through this empty part and is made suitable for use in electrical panels.
Wound Type Current Transformer: The primary windings of this type of transformer consists of many different types of conductors and are formed from several windings. The secondary windings and the primary are located on a single magnetic circuit. When necessary, it is used in transformers with double primary. It is normal for the primary current to vary in magnitude during the process. In areas where residential areas and houses are dense, this type of current transformer is generally preferred for different high-energy loads.
What are the Types of Current Transformers According to Voltage?
MV Current Transformer: This transformer type, which has medium voltage, acts as a bridge between high and low-voltage networks. These transformers, which are used for energy transmission, have a network of 3 kV-36 kV. Since MV current transformers are designed in proportion to the primary current, they easily create a secondary current.
LV Current Transformer: These transformers used in low voltage networks have a voltage of 400 V. It is preferred for use in factories and workplaces.
What Are the Types of Current Transformers According to Where They Are Used?
Current transformers are divided into two categories according to the place they are used. It is possible to call them inner type and outer type.
Indoor Type (Internal. Indoor): Transformers used in closed environments are called indoor type. It is generally suitable for cabinets in switchboards and substations.
Outdoor Type (External, Outdoor): Outdoor-type transformers, which are highly resistant to difficult and abnormal environmental conditions, are suitable for use in switchyards.
How Should the Current Transformer Be Selected?
The selection of a current transformer is a prominent issue in the design of both compensation and measurement systems. Current transformers are very important for all businesses and companies. It is known that the wrong transformer selection can cause the entire energy system to be adversely affected.
For the selection of a current transformer, the pros and cons of each product should be considered and then the appropriate current transformer should be used.
In general, all transformers have the same operation, but some are produced only for medium voltage or only for low voltage. For this reason, it is important to know the type of products and the opportunities they provide for the selection of current transformers.
In addition, with quality products in this regard, it is possible to meet your needs for many years.
What are the Conditions to Consider When Choosing a Current Transformer?
Current transformers, known as high-efficiency current meters, can sometimes be a source of risk, especially when used properly. The features to be considered when choosing a current transformer can be listed as follows:
- a) Transformer type that will provide current,
- b) Measuring system,
- c) margin of error,
- d) Busbar measurement,
- e) Rated power,
- f) Temperature value,
- g) Test voltage characteristics.
How is the Working System of the Current Transformer?
The current transformer connection is connected to the meter from two different ends. The primary winding must be connected to the end of the load to be measured, while the secondary winding is connected to the measuring instrument. As it is known, the measurement of very high currents cannot be measured with ordinary and daily measuring instruments. That’s why transformers are used. In addition, the current transformer can also convert between the primary and secondary current with an ammeter.
The power for the current transformer should be used as much as necessary, that is, large selected transformers will both work with the wrong indicator and create expensive costs. In the selection of a current transformer, features such as rated power (VA), operating voltage, saturation coefficient (n), and transformer class (CI) should be considered and considered.
Published On - 9 January 2023