The main functions of electricity
In order to ensure the reliability and safety of primary equipment operation, it is necessary to have many auxiliary electrical equipment to serve it. The combination of several electrical components that can achieve a certain control function is called a control circuit or secondary circuit. These devices should have the following functions:
(1) Automatic control function. The volume of high-voltage and high current switchgear is large, and operating systems are generally used to control opening and closing. Especially when the equipment malfunctions, the switch needs to automatically cut off the circuit. There should be a set of automatically controlled electrical operating equipment to automatically control the power supply equipment.
(2) Protection function. During the operation of electrical equipment and circuits, faults may occur, and the current (or voltage) may exceed the allowable working range and limit of the equipment and circuits. This requires a set of protective equipment that detects these fault signals and automatically adjusts (disconnects, switches, etc.) the equipment and circuits.
(3) Monitoring function. Electricity is invisible to the eyes, and whether a device is live or powered off cannot be distinguished from the outside. Therefore, various audio-visual signals, such as lights and sound, need to be set up to electrically monitor the primary equipment.
(4) Measurement function. Light and sound signals can only qualitatively indicate the working status of the equipment (with or without power). To quantitatively know the working status of electrical equipment, various instruments and measuring equipment are needed to measure various parameters of the circuit, such as voltage, current, frequency, and power.
In equipment operation and monitoring, traditional operating components, control appliances, instruments, and signal devices can mostly be replaced by computer control systems and electronic components, but there is still a certain application range in small equipment and local control circuits. This is also the foundation for realizing microcomputer automation control in circuits.
In general, the flow meter is a metering product that conforms to the general value law. The higher the accuracy, the higher the price, the higher the weight, the higher the price, the more functions, and the higher the price. The imported products are more expensive than domestic ones. expensive.
Automatic furnace temperature control --- refers to automatically turning on or off the heat source energy supplied to the furnace according to the deviation of the furnace temperature from a given temperature, or continuously changing the amount of heat source energy to stabilize the furnace temperature within a given temperature range. Meet the needs of heat treatment process.
China's metallurgy, machinery, building materials and other industries have about 10,000 flame furnaces for industrial heating and heat treatment, which consume a large amount of fossil fuels each year, accounting for about 8% of the total energy consumption of China's industrial enterprises. Although China is a large energy producing country, it is also a large energy consuming country. The effective use of energy has become an important link restricting China's economic development. Among them, especially fossil energy is a non-renewable energy. A large amount of carbon dioxide and harmful gases emitted after combustion have seriously polluted the atmosphere and damaged our living environment. Therefore, saving energy and protecting the environment are great achievements for the benefit of mankind and future generations.