What is a low-voltage electrical appliance? ?

According to the working voltage of the control electric appliance, it can be divided into two categories: high-voltage control electric appliance and low-voltage control electric appliance, with the boundary of AC 1200V and DC 1500V.

A low-voltage electrical appliance is a component or device that can manually or automatically turn the circuit on or off according to external signals and requirements to switch, control, protect, detect, change and adjust the circuit or non-electrical object.

In general, low-voltage electrical appliances can be divided into two major categories of distribution electrical appliances and control electrical appliances, and are the basic components of complete electrical equipment. In the industrial, agricultural, transportation, defense, and people's electricity sectors, most use low-voltage power supply, so the quality of electrical components will directly affect the reliability of low-voltage power supply systems.

The development of low-voltage electrical appliances depends on the development of the national economy and the needs of the development of modern industrial automation, as well as the research and application of new technologies, new processes, and new materials. Currently, it is moving toward high performance, high reliability, miniaturization, and digital modeling. The development of modularization, combination and component generalization.

In recent years, the low-voltage electrical industry has seen unprecedented opportunities for development. It is estimated that the annual installed capacity will be 21 GW from 2001 to 2010. According to the empirical matching ratio, about 480,000 low-voltage frame breakers and 4.82 million molded case breakers are needed each year. In addition, the state encourages the export of mechanical and electrical products, and the export volume has increased steadily. Therefore, the market capacity of China's low-voltage electrical appliances is huge, and it is in a rising stage, and the prospects are very optimistic.

Domestic companies are pushing for third-generation products, but foreign countries have launched fourth-generation products.

China's low-voltage electrical industry from simple assembly, imitation manufacturing to self-developed design, is now developing to nearly 1,000 series, about 1,500 production companies, with an annual output value of about 20 billion yuan.

However, the domestic low-voltage electrical appliance production enterprises are small and the number is too large, and more than 90% of the enterprises are in the repeated production of medium and low-grade products. The three generations of products coexist, according to the output value, the market share of the first generation products is 15%, the market share of the second generation products is 45%, and the market share of the third generation products is 40%. According to the national policy, the structure of low-voltage electrical products needs further adjustment in the future. Products that are backward in process, large in size, high in energy consumption and polluting the environment will be eliminated. It is expected that in 2010, the first generation of products will be eliminated, the second generation of products will become low-end products, and the third generation products will gradually become mid-range products.

Just as we accelerated the development of the third-generation products and brought them to the market, a number of well-known foreign low-voltage electrical appliance manufacturers launched a new generation of products from the late 1990s to the beginning of the 21st century. Among them, the frame circuit breakers have Schneider MT series, Siemens 3WL series, ABB company E series, GE company M-PACT series, Kama company Magnum series, etc.; molded case circuit breakers include Schneider NS series, Siemens 3VL series, ABB company Tmax series, GE company Record plus series, Moeller's NZM series, Kama's G series, and Mitsubishi's WS series. In addition to high-performance, electronic, intelligent, modular, combined, and miniaturized features, the new generation of products also features features such as communication, high reliability, good maintenance performance, and environmental compliance. In particular, a new generation of products can be connected to the fieldbus system to achieve system networking, which has made a qualitative leap in the function of low-voltage electrical products.

High performance, high reliability, intelligent, modular and green

high performance. The rated short-circuit breaking capacity and rated short-time withstand current are further improved, and Icu=Ics is realized. For example, Schneider's MT series products have a short-circuit breaking and ultimate short-circuit breaking capacity of up to 150kA.

High reliability. In addition to requiring high performance indicators, the product can be used without derating, and can be used for long-term use without full heat, thus achieving safe operation.

Intelligent. With the advent of ASICs and high-performance microprocessors, the circuit breaker realizes the intelligentization of the trip unit, which greatly enhances the protection function of the circuit breaker, and can realize overload long delay, short circuit short delay, short circuit transient, Grounding, undervoltage protection and other functions can also display system operating parameters such as voltage, current, frequency, active power, reactive power, and power factor on the circuit breaker, and can avoid malfunction under the influence of higher harmonics.

Fieldbus technology. The new generation of low-voltage electrical appliances has realized communication and networking, and can be connected with a variety of open fieldbuses for two-way communication to realize remote control, remote signaling, telemetry and remote adjustment of electrical products. The application of fieldbus technology can not only monitor the quality of power distribution, but also reduce losses. Moreover, the fieldbus technology can realize regional interlocking of multiple circuit breakers in the same regional power grid, realize automation of power distribution protection, and further improve the reliability of the power distribution system. The buses used in the field of industrial fieldbus include Profibus, Modbus, DeviceNet, etc., of which Modbus and Profibus have great influence.

Modular and modular. Combining modules with different functions into modular products according to different needs is the development direction of a new generation of products. For example, ABB's Tmax series, thermomagnetic, electronic, and electronic communicable trip units are interchangeable. The accessories are all modular in construction and can be installed without opening the lid.

Made of green material. The selection, manufacturing process and use process of product materials do not pollute the environment and comply with EU environmental protection directives.

Designed to improve a variety of professional craftsmanship

The manufacture of low-voltage electrical products involves a variety of professional processes, such as cold stamping, plastic molding, coil winding, contact welding, mold processing, SMT placement technology, etc., so the improvement of low-voltage electrical products manufacturing technology and the improvement of these professional processes Inseparable.

High-speed processing, automation, and specialization of parts processing

Stamping parts account for a large proportion of low-voltage electrical components, about 70%, so stamping parts processing plays an important role in the production of low-voltage electrical appliances. To improve the production efficiency and quality of stamping parts, it is imperative to adopt high-speed automatic punching machine and multi-station progressive die.

Plastic parts are important parts of low-voltage electrical appliances, using fully automatic or semi-automatic thermoplastic or thermosetting injection molding machines, and using a centralized feeding method.

The automatic welding machine is widely used, and the welding current, pressure and pulse period are adjustable, and the temperature is controlled to ensure the welding strength.

For the key components with large production batches and strict technical requirements, such as thermomagnetic trip units and control electric iron cores, automatic assembly technology is adopted.

The online testing equipment in the production process is the main gap between the manufacturing level of low-voltage electrical appliances in China and foreign countries. It is the main reason that affects the stability and consistency of electrical quality, and is also the direction of future technological development.

The domestic enterprises represented by Changshu Switch Manufacturing Co., Ltd. have developed CW2 series frame circuit breakers and CM2 series molded case circuit breakers. The technical level has reached the level of new generation products and has completely independent intellectual property rights. In 2005, Changshu will continue to work hard. The research and development of intelligent and communicable electrical products will shorten the gap between domestic enterprises and world-renowned enterprises.

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