The permanent magnet in ZND-12X Permanent Magnet Operating Mechanism Vacuum Circuit Breaker is a device that continuously generates a stable magnetic field, primarily used to drive the closing and opening operations of the switch. The following is a detailed analysis:
Core Function
The permanent magnet achieves fast and reliable switching control through its own magnetic field. When the controller is energized, the magnetic field generated by the permanent magnet attracts the moving iron core push rod assembly, driving the main shaft to rotate and linking it with the insulating pull rod to complete the closing action; the opening operation is the reverse.
Structural Design
Magnet Body: Typically rectangular in shape, with wear-resistant magnetic ring edges on all four sides for enhanced durability, and mounting holes on both sides for easy installation.
Magnet Type: Commonly used neodymium iron boron permanent magnets, suitable for high-load circuit breaker applications due to their high magnetic energy density and stability.
Technical Advantages
High Efficiency: Compared to traditional electromagnets, permanent magnets have faster response and lower energy consumption.
Long Lifespan: The wear-resistant magnetic ring edge design extends service life and reduces maintenance costs.
Reliability: No external power supply required, high stability, suitable for harsh environment applications.
Advantages of Permanent Magnet Switches:
1. Fast opening speed: 16-20ms, compared to 30-36ms for traditional spring-loaded switches. This faster opening speed solves many problems in power distribution networks.
2. Fewer components: A single permanent magnet core replaces the traditional gear mechanism, significantly reducing mechanical parts and improving adaptability in high-humidity areas.
Disadvantages of Permanent Magnet Switches:
1. High instantaneous power consumption of the permanent magnet core: Relying entirely on a PT (potential transformer) to convert power to DC, which cannot meet the power requirements for opening and closing. Therefore, capacitors are used as the drive power source in control boxes, utilizing the rapid discharge characteristics of the power supply.
2. Higher operating voltage: Supports only DC, commonly DC 160V, DC 220V, and DC 380V. I have worked with DC 220V mechanisms where the instantaneous current reached 130A; insufficient power caused opening and closing failures.
Applications
Primarily used in permanent magnet vacuum circuit breaker, relays, and other equipment in power systems to achieve rapid circuit switching through control circuits.
Shaanxi West Power Tongzhong Electrical Co., Ltd.
Our address
Nanpo Village, Chencang Avenue Jintai District Baoji City, Shaanxi Province, China.
Phone Number
+86 18091767067(WhatsApp/Wechat/Telegram)
