Chemical ground electrode device is also known as grounding integrated device: the device that connects electrical equipment or other objects with the ground. The grounding device is composed of grounding electrode (board), grounding bus (indoor and outdoor), grounding down lead (earthing jumper), and framework. It is used to connect the electrical system with the earth. The metal object directly contacting with the earth to realize the electrical connection is the grounding electrode. It can be an artificial grounding electrode or a natural grounding electrode. This chemical ground electrode can be given some electrical functions, such as system grounding, protective grounding, or signal grounding.
The earthing bar is the reference potential point of the electrical equipment of buildings, through which the grounding part of the electrical device is connected with the grounding electrode. It also plays another role, that is, through it, the equipotential bonding lines in the electrical device are connected with each other, so as to realize the total equipotential connection between the conductive parts of large parts in a building. The connecting line between the chemical ground electrode and earthing bar is called grounding electrode lead.
The grounding device is composed of grounding body (round steel, angle steel, flat steel, steel pipe, etc.) buried in the soil and the grounding wire for connection.
According to the purpose of grounding, the grounding of electrical equipment can be divided into working grounding, lightning protection grounding, protective grounding, and instrument control grounding.
Working grounding: it is needed to ensure the normal operation of the power system. For example, the neutral point grounding of the transformer in the neutral point direct grounding system is used to stabilize the potential of the power grid to ground, so as to reduce the insulation to ground.
Lightning protection and grounding: it is set for the needs of lightning protection. For example, the grounding of the lightning rod (line) (now called a lightning rod, line, strip) and the grounding of arrester is to make the lightning current smoothly lead into the earth, so as to reduce the lightning overvoltage, and it is also called overvoltage protection grounding.
Protective grounding: also known as safety grounding, is the grounding set for personal safety. That means the electrical equipment shell (including cable sheath) must be grounded to prevent the shell from being electrified and endangering personal safety.
I&C grounding: This grounding is set for stabilizing potential and preventing interference of thermal control system, data acquisition system, computer monitoring system, transistor or microcomputer relay protection system, and telecontrol communication system of the power plant. It's also known as electronic system grounding.
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