In-depth analysis: switchgear knowledge system construction

There have been people one-sided view, switchgear design, especially a design, but the sheet metal worker's work, the steel plate spliced into the cabinet, and then install the components into the line. A switchgear worth tens of thousands of dollars, at first glance, far less than a car that is as grand and expensive.

But the fact is not so. Switchgear design is a complex systems engineering. Its scope far beyond the sheet metal work, a wide range of electrical, mechanical, materials and many other fields, from the principles of physics to chemical properties need to be mastered in depth. If you want to design a high quality switchgear, you must have a multi-dimensional knowledge base.

The following is a detailed description of the key skills required for switchgear:

Equipment core competence dimensions

(A) Heat dissipation and conductive precision control

Heat dissipation and conductive path planning: the choice of cooling method (natural cooling, forced air-cooled) is crucial, need to take into account the air flow path, heat radiation and absorption characteristics, carefully designed conductive circuit and thermal conductive circuit, to ensure that the heat is effectively emitted and the stable transmission of current.

Connection technology: Whether it is a fixed connection or a sliding connection, it is necessary to fully consider the impact of current density on the heat, in-depth study of the electromagnetic effect, and strictly guarantee the dynamic thermal stability to ensure the reliability of the connection part.

(B) Specialized design for protection and marking

IP grade construction: the ventilation and waterproof performance of the shell are directly related to the setting of IP grade. At the same time, great importance should be attached to internal arc resistance (including strength and protective measures) and environmental protection performance (to ensure that the equipment is environmentally friendly).

Marking and labeling: Clear and accurate marking and labeling are the key guidelines for equipment identification and correct operation, which help operators to operate and maintain the equipment quickly and accurately.

(C) Testing and insulation strict guarantee

Testing and Reliability Verification: Through comprehensive insulation testing, thermal testing and other means, the performance of the equipment is strictly verified to ensure that the equipment can operate reliably under various working conditions.

Electrical insulation design: covering high-voltage insulation, precise setting of electrical gap, insulation treatment along the surface and interface, optimization of support insulation structure, and shielding and isolation insulation design, etc., to ensure all-round electrical insulation performance.

Electrical system construction

(A) Electrical measurement and wiring layout

Communication system construction: build an efficient and stable communication network to realize real-time and accurate information interaction between equipment, laying the foundation for intelligent control and management of equipment.

Cable planning and terminal setting: rationally plan the spatial layout of cables and accurately set up terminals to ensure safe and reliable cable connection and stable signal transmission.

Integration of intelligent equipment: Introducing advanced intelligent equipment to enhance the intelligent level of equipment and realize self-monitoring, diagnosis and control of equipment.

Voltage and Current Measurement: With the help of CT (current transformer), VT (voltage transformer), CPT (capacitive voltage transformer) and other professional measurement equipment, the voltage and current are measured accurately, providing data support for the stable operation of the power system.

Fixing and routing of secondary wires: carefully fixing secondary wires, rationally planning routing, guaranteeing the stability and safety of secondary circuits, and ensuring the accurate transmission of control signals.

(B) Scientific and reasonable application of materials

Selection of insulation materials: Selection of insulation materials with excellent resistance to electric traces and arc resistance to ensure the insulation reliability of the equipment in the high voltage, strong electric field environment.

Selection of conductive materials: comprehensive consideration of the electrical properties of conductive materials and mechanical properties, choose to meet the current transmission requirements, but also has sufficient mechanical strength of the material.

Use of thermally conductive materials: reasonable use of thermally conductive materials, optimize the heat transfer path, improve the thermal efficiency of the equipment.

Mold Design and Manufacturing: In the process of plastic heat-shrinking, heat-setting and metal processing, we accurately design the molds to ensure the dimensional accuracy and quality stability of the products.

Surface treatment process: Adopt advanced surface treatment process to effectively protect the surface of the equipment and enhance the corrosion resistance and oxidation resistance of the equipment.

Sealing technology guarantee: the use of reliable sealing technology to ensure the protective performance of the equipment, preventing dust, water vapor and other impurities from intruding.

Choice of structural materials: According to the structural requirements of the equipment, the reasonable choice of alloy, steel, aluminum structure and profiles, to build a strong, stable equipment framework.

Structural design is ingenious

Frame construction and safety guarantee

Frame structure design: The frame structure is carefully designed to ensure that it has sufficient support strength, while fully considering the seismic factors to ensure the stability of the equipment in harsh environments.

Selection and application of fasteners: Selection of suitable fasteners to ensure that the various parts of the equipment are firmly connected to prevent loosening.

Hinge and door locking system: Design convenient and reliable hinge and door locking system to facilitate the operation and maintenance of the equipment, and at the same time protect the safety of the equipment.

Safety interlocking mechanism: build a perfect safety interlocking mechanism to effectively prevent misoperation and ensure the safety of personnel and equipment.

Cover and door design: Reasonable design of the cover and door can effectively protect the internal components and facilitate the maintenance and repair of the equipment.

Plug-in and pull-out design: Plug-in and pull-out design is adopted to facilitate the maintenance of the equipment and replacement of components and improve the maintainability of the equipment.

Mechanical stress test: Through strict mechanical stress test, the reliability of the equipment structure is examined to ensure that the equipment will not be structurally damaged during long-term use.

Compliance with regulations and standards and analysis and diagnosis

(A) strict compliance with regulations and standards

Laws, regulations and standards implementation: Strictly follow the mandatory standards, regional regulations and industry standards, while giving full consideration to the use of different regions, to ensure that the equipment meets the requirements of the norms.

(B) Analyze and diagnose scientifically

Analysis, prognosis and diagnosis technology: With the help of advanced simulation, analog analysis and calculation technology, tolerance analysis and motion simulation are carried out to accurately restore equipment failures, analyze the causes in depth, and formulate practicable improvement measures.

Data statistics and analysis: Through reliability analysis, tests and other means, the equipment data are counted and analyzed, such as simulation analysis of internal arc faults of switchgear, which provides data basis for equipment optimization and upgrading.

Intelligent integration and application expansion

(A) Intelligent technology in-depth integration

Digital transformation: actively integrate modern sensing technology, modern control technology, diagnostic technology, promote the digital transformation of equipment, and enhance the intelligent level of equipment.

Network integration and development: with the help of the Internet, Internet of Things, ubiquitous power network and other technologies, realize the interconnection and intelligent management of equipment, and create an intelligent power ecosystem.

System Integration and Engineering Application: Efficient and accurate integration of equipment and systems to ensure that the equipment can operate stably and maximize its performance in engineering applications.

Mastery of system principle: master the system first and second principles, provide a solid theoretical basis for the design, commissioning and maintenance of equipment.

(B) Application and operation and maintenance of comprehensive optimization

Environmental adaptation and application scenario selection: fully understand the environmental knowledge, according to different applications, select the most appropriate equipment, to ensure that the equipment in different environments can run normally.

On-site Installation and Service Assurance: Provide professional and efficient on-site installation and service to ensure the correct installation and debugging of the equipment, laying the foundation for the stable operation of the equipment.

Equipment renovation and upgrading: according to the actual demand, timely renovation and upgrading of equipment to improve the performance and adaptability of the equipment.

Refinement of operation and maintenance management: establish a perfect operation and maintenance management system, conduct regular inspection and maintenance of equipment to ensure long-term stable operation of equipment.

For basic and mature switchgear, the existing design and engineering capabilities may be able to meet the demand. However, for slightly more complex products with higher currents and voltages, if there is a lack of sufficient professional skills, it will be difficult to analyze the causes and solve the problems effectively once the test fails or malfunctions occur.

In the context of the booming development of new power systems, the application of source network and load storage has put forward higher requirements for switchgear, requiring more high and new technology products. The equipment must be more efficient, reliable and intelligent in order to realize the fast switching of different energy sources and guarantee the continuity of power supply. Many new products and application solutions urgently need to be explored and created by professionals in the field of switchgear. After all, without solid and reliable switchgear as a support, all intelligent ideas will become castles in the air.

In fact, switchgear involves an extremely large body of knowledge. In addition to complete sets of capabilities, switching components such as circuit breakers, contactors, fuses, transformers, etc., but also involves the arc, open and close the theoretical knowledge of basic science. The old generation of experts in the electrical industry spent their lives studying theory and practice, leaving behind countless valuable experience, which is worthy of our continued in-depth study!