What are the models of current transformers, and the specifications of current transformers

There are also some enterprise models that are more special, such as and so on.

The selection basis of low-voltage current transformer is as follows:

1.Rated insulation voltage: The insulation voltage of the transformer is 500V, which is generally used for cable threading; The insulation voltage is 660V, which is suitable for wearing bare copper and aluminum bars.

The size is larger, can be fixed and installed, and is generally used for fixed cabinets with large installation spacing; The LMK, BH, SDH are small in size and can be fixed directly to the busbar or cable, and are generally used in high-current circuits or chests of drawers.

3.Depending on the size of the busbar or cable, different bore styles and sizes need to be selected.

The current is basically independent of the selection.

Specific models:

Function: As an AC current signal acquisition element, this series of transformers can be used with measuring instruments, the primary current measurement range is 5-6300A, the secondary output is 5A or 1A, and the measurement range is 5-120% of the rated value.

Transformer is also known as instrument transformer, which is a general term for current transformer and voltage transformer. It can turn high voltage into low voltage and high current into small current for measurement or protection system. Its function is mainly to convert high voltage or high current into standard low voltage (100V) or standard low current (5A or 1A, both refer to rated values) in proportion, so as to realize the standardization and miniaturization of measuring instruments, protection equipment and automatic control equipment.

Commonly used current transformer models and specifications are:5 and other specifications.

The types of current transformers are classified in different ways.

The classification by insulating medium is:

1. Dry-type current transformer: It is made of ordinary insulating materials and is treated with impregnated paint as insulation.

2. Pouring current transformer: current transformer cast with epoxy resin or other resin mixed materials.

3. Oil-immersed current transformer: insulating paper and insulating oil are used as insulation, generally outdoor type.

4. Gas insulated current transformer: the main insulation is composed of gas.

The classification by installation method is:

1. Through-type current transformer: used to pass through the screen or wall.

2. Pillar type current transformer: installed on a flat surface or pillar, and used as a current transformer for the primary circuit conductor pillar.

3. Tubular current transformer: a kind of current transformer that is directly mounted on the insulated sleeve without a primary conductor and primary insulation.

4. Busbar current transformer: a kind of current transformer that does not have a conductor but has a primary insulation, and is directly set on the bus.

The selection of the current transformer mainly depends on the current generated in the circuit, such as the power is 2KW, then the current generated is roughly 9A, and the current transformer that needs to be selected is 15A. Note that when the current transformer is in operation, the secondary side cannot be disconnected.

The current transformer is an instrument that converts the large current on the primary side into a small current on the secondary side according to the principle of electromagnetic induction. A current transformer is made up of a closed core and windings. It has a small number of turns on the primary side winding and is strung in the line where the current needs to be measured.

Therefore, it often has all the current of the line flowing, the number of turns of the secondary side winding is more, it is connected in series in the measuring instrument and the protection loop, when the current transformer is working, its secondary side loop is always closed, so the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to short circuit.

The current transformer converts the large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be opened. The entry describes its working principle, parameter description, classification, and usage introduction.

How it works. There is a huge disparity in the current in the lines of power generation, substation, transmission, distribution and consumption, ranging from a few amperes to tens of thousands of amperes. In order to facilitate measurement, protection and control, it needs to be converted into a relatively uniform current, and the voltage on the line is generally relatively high, so direct measurement is very dangerous.

The current transformer plays the role of current conversion and electrical isolation.