Equipment directly related to the production of electrical energy and transmission and distribution is called a primary equipment. Including various high voltage circuit breakers, ...

First, the term explanation:

1. Three-phase AC: A three-phase AC consisting of three AC circuits with the same frequency, equal potential amplitude, and 120° phase difference.

2, primary equipment:

Equipment directly related to the production of electrical energy and transmission and distribution is called a primary equipment. Including various high voltage circuit breakers, isolating switches, bus bars, power cables, voltage transformers, current transformers, reactors, lightning arresters, arc suppression coils, shunt capacitors and high voltage fuses.

3. Secondary equipment:

Auxiliary equipment for monitoring, measuring, manipulating control and protection of primary equipment. Such as various relays, signal devices, measuring instruments, recording and recording devices, as well as telemetry, remote signaling devices and various control cables, small busbars, etc.

4, high voltage circuit breaker:

Also known as high-voltage switch, it can not only cut off or close the no-load current and load current in the high-voltage circuit, but also cut off the overload current and short-circuit current through the action of the relay protection device when the system fails. It has a fairly perfect arc extinguishing structure and sufficient current interrupting capability.

5, load switch:

The construction switch of the load switch is similar, except that a simple arc extinguishing device is added. It also has an obvious break point, has a certain ability to cut off, can operate with load, but can not directly break the short-circuit current, if necessary, rely on the high-voltage fuse connected with it.

6. Air circuit breaker (automatic switch): It is a low-voltage switch that is closed by manual (or electric), holds the closing position with a lock, and acts as a tripping device by a tripping mechanism. It is widely used in 500V.

In the following AC and DC devices, when an overload, short circuit, voltage drop or disappearance occurs in the circuit, the circuit can be automatically cut off.

7. Cable: A wire consisting of a core wire (conductive part), an external insulating layer and a protective layer is called a cable.

8, bus:

An electrical bus is a path device that collects and distributes electrical energy. It determines the number of power distribution equipment and shows how the generator, transformer, and wiring are connected, and how it is connected to the system to complete the transmission and distribution tasks.

9. Current transformer: Also known as instrument transformer, it is an instrument that turns large current into small current.

10, transformer: A static electrical device, is used to convert a certain value of the AC voltage into another frequency or a different value of the AC voltage.

11. High-voltage electroscope: A tool used to check whether high-voltage network power distribution equipment, overhead lines, and cables are energized.

12, grounding wire: It is an important tool to ensure the staff in case of accidental voltage on the equipment and lines that have been powered off. According to the Ministry's regulations, the grounding wire must be made of bare copper wire of 25mm 2 or more.

13, signage:

It is used to warn people not to access the equipment and live parts, to indicate the work location for the staff, to remind them to take safety measures, and to prohibit the notification of a trace of a certain equipment or a certain line of electricity. Can be divided into warning class, permission class, prompt class and prohibition.

14. Covering: In order to prevent the staff from accidentally touching the part of the live equipment, the screen protector is divided into two types: temporary cover and permanent cover.

15, insulating rod:

Also known as the gram rod, insulated rod, operating rod and so on. The insulating rod is composed of a working head, an insulating rod and a grip. It is used when closing or opening high-voltage isolating switches, attaching and detaching portable grounding wires, and performing measurements and tests.

16. Step voltage: If the horizontal distance on the ground is 0.8m

There is a potential difference between the two points. When the two feet of the human body touch the two points, the human body will withstand the voltage. This voltage is called the step voltage. The maximum step voltage appears at a horizontal distance of 0.8m from the ground of the grounding body.

Between the ground and the grounding body.

17. Phase sequence: The order of the phase is the order in which the instantaneous value of the alternating current changes from a negative value to a positive value through a zero value.

18, power grid: Power grid is a part of the power system, it is a unified network of various substations (station) and a variety of different voltage levels of transmission and distribution lines.

19. Power System: The power system is part of the power system. It consists of generators and power distribution units of power plants, boost and step-down substations, transmission and distribution lines, and users' electrical equipment.

20, power system: Power plants, substations and users of electrical equipment, the phase of the power network and thermal network (or hydraulic) system is generally called the power system.