News

The basic principle and selection principle of high voltage DC contactor

Release time:

2022-04-25

In a broad sense, the high-voltage DC contactor refers to the electrical technical equipment that affects the magnetic field generated between a coil current and a closed contact to control the cultural load in the electricity consumption of industrial enterprises. Contactors include AC contactors (voltage information AC) and DC contactors (voltage DC), which are used in China's power, power distribution, and power consumption.

The basic principle and selection principle of high voltage DC contactor

High-voltage DC contactor broadly refers to the electrical technical equipment that generates an influencing magnetic field between a coil current in the electricity consumption of industrial enterprises, and closes the contact to control the cultural load. Contactors include AC contactors (voltage information AC) and DC contactors (voltage DC), which are used in China's power, power distribution, and power consumption. Contactors are mainly divided into two DC contactors and AC contactors in the form of main contact connection circuits. According to the actual operation management organization development is divided into electromagnetic contactor, permanent magnet contactor.

In electrical and mechanical engineering, because students can quickly cut off the AC and DC main circuits and frequently switch on and off the high-current signal control (800A) circuit, contactors often use motors as internal control research objects, and are also used to control power loads such as production plant equipment, electric heaters, working mother machines, various power units, etc. The contactor not only needs to be able to connect and disconnect the circuit, but also has a low voltage open circuit to protect the environment. Contactor control capacity is large, suitable for their own frequent operation and remote intelligent control, is one of the important economic factors in the automatic analysis and control application system.

One. The principle of high-voltage DC contactor:

The design of the DC contactor coil is: after the switching power supply is turned on, the coil transmits current. Make the static iron core contain the attraction force of the current electromagnet, press the iron core, and make the contact effect. The contacts are frequently opened to show the appearance of opening. If the contacts are frequently used, the two are connected in a closed state. After the power is cut off, due to the current effect, the coil will lose the attraction of the electromagnet, and the frequently disconnected contacts will be disconnected.

II. How to choose High-voltage DC contactor :

1. The choice of high-voltage DC contactor must be determined according to the required current type and net load. In addition, a relative calculation method must be developed for the main contacts in the DC contactor to calculate the current. If the actual operation of the selected AC contactor is too complicated and requires continuous rotation, the current level of the main contact must be reduced by one level.

2. The working voltage of the coil in the high-voltage DC contactor cannot be the same as the working voltage of the main contact. Useless household appliances, simple wiring, can be applied to the rated current of 22020V. If the wiring is complicated, many home appliances are used alone, and the use time is long, you can choose 110V coil AC contactor.

3. The actual number of operations of the DC contactor is the closing frequency. If there is no large current, the product will heat up when contacting the hair. If the current requirements we need are too high, we must choose a larger high-voltage DC contactor ourselves. We can query the rated current of the product through Chinese products and brands at the same time, and the purchasing power is relative to AC contactor products.

The above introduction is the basic principle and selection principle of HVDC contactor . What is the difference? If you need to know more, please feel free to contact us! Our company has many years of experience and looks forward to your joining

at any time.