What are the commonly used high voltage electrical appliances? What is a high voltage appliance

Electrical equipment mainly refers to transformers and reactors.

Capacitors, combination appliances, circuit breakers, transformers, lightning arresters.

Coupling capacitors, transmission lines, power cables, grounding devices, generators, condensers, motors, closed busbars, thyristors.

Wait. In order to ensure the reliable operation of high-voltage electrical equipment, the general conditions for the selection and calibration of high-voltage electrical equipment are:

1) According to the normal working conditions, including voltage, current, frequency, breaking current, etc.;

2) According to the short-circuit conditions, including dynamic stability and thermal stability calibration;

3) Choose according to the environmental working conditions such as temperature, humidity, altitude, etc.

Answer: 1. Switching appliances: mainly high-voltage circuit breakers, high-voltage isolation switches, high-voltage fuses, high-voltage load switches and grounding short-circuits. High-voltage circuit breakers are used to turn on or off circuits in no-load, normal load, or short-circuit fault conditions. High pressure.

High-voltage electrical appliances are equipment used in high-voltage lines to achieve closing, breaking, protection, control, regulation, and measurement. General high-voltage electrical appliances include switching appliances, measuring appliances and current limiting and voltage limiting appliances. The internationally recognized dividing line between high and low voltage electrical appliances is 1kV AC (1500V for DC).

AC above 1kV is a high-voltage electrical appliance, and 1kV and below are low-voltage electrical appliances. Transformers are sometimes included in the list of high-voltage appliances.

Low-voltage, equipment with a working voltage higher than AC 1000V or DC 1500V.

Medium voltage (MV): 1-35kV, not more than 35kV

High voltage (HV): 35-230kV, used for power transmission, generally not used for electrical equipment.

1. High voltage: According to the definition in GB T: high voltage usually refers to a voltage level higher than 1000V (not included); It refers to the electrical connection line of the distribution line with an AC voltage of more than 1000V or a DC voltage of more than 1500V.

2. Low-voltage electricity: According to the 2013 edition of the substation part of the power safety work regulations of the State Grid Corporation, low-voltage refers to the voltage level of 1000V and below. For power generation and power supply, it is bounded by about 6000V and 7000V, with high voltage electricity above and low voltage electricity below.

3. In industry: the voltage of 380V or above is called high-voltage electricity. It is customary to say that 220 380V is low voltage, higher than this voltage is high voltage, the previous electrical regulations stipulate that higher than 250V voltage is high voltage, 250V or below are low voltage, although the new "electrical safety work regulations" has been introduced, but many places implement the previous standards.

According to the relevant provisions of the state, high-voltage electricity refers to the distribution line with an AC voltage of more than 1000 volts or a DC voltage of more than 1500 volts.