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The 600A DC Contactor manufacturer will take you to understand: the factors that affect the life of DC relays

The 600A DC Contactor manufacturer will take you to understand: the factors that affect the life of DC relays

  • Categories:Industry News
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  • Time of issue:2021-08-17
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(Summary description)Many people want to know what are the factors that affect the life of DC relays. The following 600A DC Contactor manufacturers will take you to find out.

The 600A DC Contactor manufacturer will take you to understand: the factors that affect the life of DC relays

(Summary description)Many people want to know what are the factors that affect the life of DC relays. The following 600A DC Contactor manufacturers will take you to find out.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-08-17
  • Views:0
Information

Many people want to know what are the factors that affect the life of DC relays. The following 600A DC Contactor manufacturers will take you to find out.

customized 600A DC Contactor products
1. The influence of magnetic field blowing on the electrical life of the contact
The 600A DC Contactor manufacturer tells you that the arc is a current in the ionization channel formed after the voltage penetrates the medium between the moving and static contacts, and it completely obeys the law of electromagnetic action. The 600A DC Contactor manufacturer tells you that the magnetic field generated by the arc is as shown in the figure. To determine the direction of the arc force, use the left-hand rule. The direction of force is indicated by F in the figure.
Magnetic blowing is the use of permanent magnets or electromagnets to generate a magnetic field. The direction in which the magnetic field interacts with the arc is to pull the circuit away from the moving and static contacts.
The 600A DC Contactor manufacturer tells you that with the rapid movement of the moving contact and the application of magnetic blowing, the arc is elongated, and the arc resistance increases rapidly, causing the arc current to drop sharply, and the thermal efficiency of the arc decreases. The 600A DC Contactor manufacturer tells you that the degree of dielectric ionization decreases as the temperature decreases, and the electrical conductivity of the arc channel decreases. If the arc is drawn while the arc is moving outwards, and other means of cutting the arc and cooling the arc are used, the arc will be extinguished more quickly.
The 600A DC Contactor manufacturer tells you that reducing the arcing time is an important means of protecting the contacts. A good magnetic blowing design will inevitably extend the life of the relay. Magnetic blowing has been widely used in high-power relays and contactors that are less sensitive to space requirements. In small relays, only individual products have designed similar devices.
2. The influence of ambient air pressure on the electrical life of contacts
In order to shorten the arcing time, in addition to the use of the above-mentioned magnetic blowing means to draw the arc, the methods often used for arc extinguishing in a narrow space include changing the contact closing environment, filling the sealed arc extinguishing chamber with gas with high ionization energy or The arc extinguishing chamber is evacuated.
3. The influence of mechanical parameters on the electrical life of contacts
The structural parameters related to the electrical life of the contact include: contact area, breaking mechanism, contact pressure, etc.
The contact area, the larger contact area of ​​the dynamic and static contacts, can provide a larger path for the current, reduce the contact resistance, and reduce the temperature rise. The 600A DC Contactor manufacturer tells you that when the relay is closed or broken, the larger the contact, the easier it is to radiate the heat from the small arc, thereby reducing the risk of melting the contact.
The breaking mechanism is another technical point in the design of the relay. The mechanism itself has a stable action cycle, and the time required from the start to the final movement to the large opening position directly affects the arcing time.
The contact pressure of the moving and static contacts, there is always contact resistance between the moving and static contacts, the greater the contact pressure, the smaller the resistance. Larger contact pressure can reduce the electrical loss and temperature rise of the relay under normal working conditions; relatively small damage or raised burrs on the contact surface will not produce obvious adverse effects under greater pressure, and After many times of closing, the impact between the contacts will smooth out these small flaws.
4. The tightness of the arc extinguishing chamber
The sealing of the vacuum interrupter, the welding seam of the shell, etc., which is impossible to achieve, may have the possibility of air leakage. An allowable air leakage coefficient has been included in its design index, and chronic air leakage is inevitable. In addition, when relays are used in electric vehicles, the severe vibration environment anytime and anywhere also seriously tests the sealing quality.
The manufacturer of 600A DC Contactor tells you that as more and more air enters the sealed cavity, and the sealing of the shell becomes worse and worse, the vacuum in the arc extinguishing chamber gradually decreases, and the arc extinguishing ability will gradually become worse, which affects the relay. An important factor in longevity.
High-voltage DC relays were originally mainly used in the power industry and aviation and aerospace industries. The 600A DC Contactor manufacturer tells you that electric vehicles have gradually emerged in recent years, and driving power distribution systems has become a very important application scenario for high-voltage DC relays. The high voltage is relative to the 24V, 48V low voltage system. Some low-speed electric vehicles choose the power configuration of 60V and 72V systems. Generally, the voltage of high-speed passenger cars is above 200V, and the bus can reach more than 600V. The 600A DC Contactor manufacturer tells you that the relay that meets the requirements of this voltage stage is called a high-voltage DC relay.

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