Qinhuai buys used high-voltage voltage stabilizer cabinets and second-hand vacuum circuit breakers.

Drawing Principles: 1. When drawing electrical installation wiring diagrams, all electrical components are depicted according to their actual positions on the installation base plate. The area occupied by each component is scaled uniformly based on their actual dimensions. 2. When drawing electrical installation wiring diagrams, all parts of a single component are drawn together and enclosed with a dashed line. Occasionally, multiple electrical components are enclosed with a dashed line to indicate they are installed on the same base plate.

【Main Structure of Vacuum Circuit Breaker】The vacuum circuit breaker mainly consists of three major parts: the vacuum interrupter chamber, the electromagnetic or spring operating mechanism, the bracket, and other components. The vacuum interrupter chamber, which varies in design according to the type of switch, includes the following: an external shielded ceramic vacuum interrupter chamber, a cup-shaped longitudinal magnetic field miniaturized vacuum interrupter chamber, and an internal sealed glass bulb vacuum interrupter chamber. Its basic structure is as follows: ① The airtight insulation system (housing) is an airtight container composed of a ceramic, glass, or microcrystalline glass airtight insulation cylinder, a moving end cover plate, a fixed end cover plate, and a stainless steel bellows. To maintain airtightness, strict operation procedures are required for the sealed type, and the materials themselves must have low permeability and minimal internal gas emission.

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Analyze the relay operation using Ohm's Law: The criteria for discrimination is that the voltage-type coil has sufficient voltage applied across its ends, and the current-type coil has sufficient current passing through its ends. For the voltage-type relay coil circuit, it is considered that the relay (contactor) operates (energized) when the ends of the coil are connected through several relay contacts or the current coil is connected to the positive and negative poles of the separate power supply. If there is a short-circuit contact in the circuit, or a significant resistance is串联 in the coil circuit, or the coil is short-circuited by a parallel connection, it is considered that the relay (contactor) does not operate (not energized). Cabinet structure and electrically protected requirements: To ensure the personal safety of operation and maintenance personnel, when selecting a low-voltage switchgear cabinet, it is necessary to understand the protective methods for live parts. Among them, several methods are available for selection. For door operation, there is no electrically protected; the breaker at the top has busbars with protective plates; use a single-layer door to directly extend the breaker operation handle outside the cabinet; use a double-layer door to directly extend the breaker operation handle outside the inner and outer doors; install the breaker operation handle directly on the cabinet door for external operation; use fixed partition cabinets to add isolation protection between the horizontal busbar room and the units, as well as between units; use drawer cabinets to completely isolate the units from the busbar room and terminal blocks, providing operational protection performance.