Overview of Low-Voltage Electrical Appliances
Low-voltage electrical appliances refer to electrical equipment that operates in circuits with AC voltage less than 1200V and DC voltage less than 1500V, serving functions of switching, protection, control, or regulation, as well as electrical equipment that uses electrical energy to control, protect, and regulate non-electrical processes and equipment. The vast majority of the load in the power system is supplied by low-voltage electrical appliances. Most of the various production machinery and equipment of power users are powered by low voltage. In the vast low-voltage power distribution and consumption systems, a large number of low-voltage electrical appliances are needed for control and protection.
Low-voltage electrical appliances are components or devices that can manually or actively connect or disconnect circuits according to external signals and requirements, in order to switch, control, maintain, detect, transform, and regulate circuits or non-electrical targets. Control electrical appliances can be divided into two main categories based on their operating voltage: AC 1200V and DC 1500V. In general, low-voltage electrical appliances can be divided into two main categories: distribution electrical appliances and control electrical appliances, and are the basic components of complete sets of electrical equipment. In industry, agriculture, transportation, national defense, and residential electricity consumption sectors, low-voltage power supply is mostly used; therefore, the quality of electrical components directly affects the reliability of the low-voltage power supply system.
Overview of high voltage electrical appliances
High-voltage electrical equipment is widely used in power systems, but in my country, due to the lack of a clear standardized definition, the meaning of this term varies in different contexts. This section introduces the concept presented in higher education textbooks and is generally accepted.
High-voltage electrical equipment is widely used in power systems, but in my country, due to the lack of a clear standardized definition, the meaning of this term varies in different contexts. This section introduces the concept presented in higher education textbooks and is generally accepted.
Classification standards for low-voltage and high-voltage electrical appliances
Low-voltage electrical appliances and high-voltage electrical appliances are mainly classified according to the voltage level of the line during use.
How to classify low-voltage and high-voltage electrical appliances:
1. Low-voltage electrical appliances: In everyday life, low-voltage electrical equipment refers to equipment that controls the switching on and off of devices in a 380/220V power grid.
Low-voltage electrical appliances are components or devices that can manually or automatically connect or disconnect circuits according to external signals and requirements, in order to achieve switching, control, protection, detection, transformation, and regulation of circuits or non-electrical objects. Control electrical appliances can be divided into two main categories based on their operating voltage, with AC 1000V and DC 1500V as the dividing line: high-voltage control electrical appliances and low-voltage control electrical appliances. In general, low-voltage electrical appliances can be divided into two main categories: distribution electrical appliances and control electrical appliances, and are the basic components of complete sets of electrical equipment.
2. High-voltage electrical appliances refer to equipment used in high-voltage lines to achieve closing, opening, protection, control, regulation, and measurement.
Typical high-voltage electrical appliances include switching devices, measuring devices, and current-limiting and voltage-limiting devices. Internationally, the dividing line between high and low voltage electrical appliances is 1kV for AC (1500V for DC). Appliances above 1kV AC are considered high-voltage, while those at 1kV and below are considered low-voltage. Transformers are sometimes also included in the category of high-voltage electrical appliances.
