Liu Shi second-hand vacuum circuit breaker recycling; electrical distribution cabinet recycling

Liuhsu Recycled Power Distribution Cabinets, Used Vacuum Circuit Breaker Recycling

The development direction of switching power supplies is towards high frequency, high reliability, low power consumption, low noise, anti-interference, and modularization. Due to the key technology of switching power supplies being lightweight, small, and thin, which is high frequency, overseas manufacturers of switching power supplies are all committed to the simultaneous development of new high-intelligent components, particularly improving the loss of secondary rectification devices. They are also investing heavily in technological innovation for power ferrite materials to achieve high magnetic properties at high frequencies and greater magnetic flux density (Bs). Miniaturization of capacitors is also a critical technology. The application of SMT technology has greatly advanced switching power supplies by placing components on both sides of the circuit board to ensure their lightweight, small, and thin dimensions. The high-frequency development of switching power supplies inevitably necessitates innovation in traditional PWM switching technology. Achieving Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) soft switching technology has become mainstream, significantly improving the efficiency of switching power supplies.

The electrical system micro-computer protection device, composed of microcomputers, is a relay protection system and represents the development trend of relay protection in power systems (now largely achieved, with further development needed). It boasts high reliability, selectivity, and sensitivity. The hardware of the micro-computer protection device includes a microprocessor (single-chip microcomputer) at its core, along with input/output channels, human-machine interface, and communication interfaces. This system is widely used in the power, petrochemical, mining smelting, railway, and civil construction industries. The hardware of the microcomputer is universal, while the performance and functions of the protection are determined by the software. Common electrical diagrams include: electrical schematic diagrams, electrical component layout diagrams, and electrical installation wiring diagrams. The standard drawing sizes typically used are 297×210, 297×420, 297×630, and 297×840mm, with four available formats. For special requirements, other sizes can be selected according to the GB126-74 standard for mechanical drafting.

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Cabinet Surface Corrosion Requirements: Low-voltage switchgear should have a service life of over 30 years. For areas with high humidity, choose cabinets with high corrosion resistance for metal components and door panels. Metal components are typically made of steel plates, with surface treatments such as electroplating zinc, spraying plastic, galvanized steel plate, and aluminum-zinc alloy sheet, which can be selected according to actual requirements. Electrical Component Selection: Electrical components occupy a significant portion of the price of low-voltage switchgear. When purchasing, consider brands with a comprehensive sales service system and high-quality service. [Circuit Breaker] Failure to Trip: Depending on the cause of the fault, the following failure phenomena may occur: The circuit breaker fails to trip remotely; the manual trip from the ground fails; and during an accident, the relay protection operates, but the circuit breaker fails to trip. [Circuit Breaker] Failure to Trip Analysis: (1) Breaker operation circuit is open; (2) Breaker coil is open; (3) Operating power voltage is reduced; (4) Breaker coil resistance increases, reducing trip force; (5) Breaker top rod is deformed, causing difficulty in tripping and reducing trip force; (6) Severe deformation of the breaker top rod, causing the breaker to jam during tripping.