Electrical main functions
In order to ensure the reliability and safety of primary equipment operation, many auxiliary electrical equipment are needed to serve it. The combination of several electrical components capable of achieving a certain control function is called a control circuit or a secondary circuit. These devices must have the following features:
(1) Automatic control function. The volume of high-voltage and high-current switching equipment is very large. Generally, operating systems are used to control opening and closing. Especially when the equipment fails, the switch needs to automatically cut off the circuit. There must be a set of automatically controlled electrical operation equipment. Automatic control of power supply equipment.
(2) Protection function. Electrical equipment and circuits will fail during operation, and the current (or voltage) will exceed the range and limits of the equipment and circuits allowed to work. This requires a set of signals to detect these faults and automatically adjust the equipment and circuits (disconnect, Switching, etc.).
(3) Monitoring function. Electricity is invisible to the eyes. Whether a device is powered on or off cannot be distinguished from the outside. This requires the installation of various audio-visual signals, such as lights and sounds, to electrically monitor the primary equipment.
(4) Measurement function. Light and sound signals can only qualitatively indicate the working status of the equipment (powered or off). If you want to know the working condition of electrical equipment quantitatively, you also need to have a variety of instrument measuring equipment, measuring various parameters of the circuit, such as voltage , Current, frequency and power.
In the operation and monitoring of equipment, most of the traditional operating components, control appliances, instruments and signals can be replaced by computer control systems and electronic components, but there is still a certain scope of application in small equipment and local local control circuits . This is also the basis for the circuit to achieve microcomputer automation control.
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.