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The manufacturer of HVDC Relay will show you: the factors that affect the life of HVDC Relay

The manufacturer of HVDC Relay will show you: the factors that affect the life of HVDC Relay

  • Categories:Industry News
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  • Time of issue:2021-06-25
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(Summary description)The manufacturer of HVDC Relay tells you that the arc is a current in the ionization channel formed after the voltage breaks down the medium between the moving and static contacts, which completely obeys the law of electromagnetic action. The manufacturer of HVDC Relay tells you to judge the direction of the arc force and use the left-hand rule.

The manufacturer of HVDC Relay will show you: the factors that affect the life of HVDC Relay

(Summary description)The manufacturer of HVDC Relay tells you that the arc is a current in the ionization channel formed after the voltage breaks down the medium between the moving and static contacts, which completely obeys the law of electromagnetic action. The manufacturer of HVDC Relay tells you to judge the direction of the arc force and use the left-hand rule.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-06-25
  • Views:0
Information

1. The influence of magnetic field blowing on the electrical life of the contact
The manufacturer of HVDC Relay tells you that the arc is a current in the ionization channel formed after the voltage breaks down the medium between the moving and static contacts, which completely obeys the law of electromagnetic action. The manufacturer of HVDC Relay tells you to judge the direction of the arc force and use the left-hand rule.

customized HVDC Relay supplier(s)
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 manufacturer of HVDC Relay 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, making the arc current drop sharply, and the thermal efficiency of the arc decreases accordingly. 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.
Reducing the arcing time is an important protection method for the contacts. The manufacturer of HVDC Relay tells you that 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
The manufacturer of HVDC Relay tells you that in order to shorten the arcing time, in addition to using the above-mentioned magnetic blowing means to draw the arc, the method often used for arc extinguishing in a small space is to change the contact closing environment and charge the sealed arc extinguishing chamber with ionization energy. High gas or vacuum the interrupter.
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 manufacturer of HVDC Relay tells you 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 manufacturer of HVDC Relayc tells you that when the relay is closed or broken, the larger the contact, the easier it is to dissipate the heat brought by the small arc, thereby reducing the risk of melting of 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. The manufacturer of HVDC Relay tells you that a higher contact pressure can reduce the electrical loss and temperature rise of the relay under normal working conditions; the manufacturer of HVDC Relay tells you that the contact surface has relatively small damage or raised burrs. Under greater pressure, No obvious adverse effects will be produced, and the impact force between the contacts will smooth out these small flaws after multiple openings.
4. The tightness of the arc extinguishing chamber
The manufacturer of HVDC Relay tells you that there is a possibility of air leakage in the vacuum interrupter, which is impossible to achieve, and the welding seam of the shell. 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 HVDC Relay 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 life of the relay. An important factor of
HVDC Relay was originally mainly used in the power industry and aviation and aerospace industries. In recent years, electric vehicles have gradually emerged, driving the power distribution system, and has become a very important application scenario for HVDC Relay. 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 relay that meets the requirements of this voltage stage is called HVDC Relay.

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