1. Earth (earth, ground): (1) Conductive earth slopes with equal potentials, and the potential at any point can be regarded as zero potential. (2) Conductor, such as the shell of a soil or steel ship, as a circuit The return channel, or as a zero potential reference point, (3) A position or portion of the circuit that has zero potential with respect to ground.
2. Remote earth (remote ground): The increase in the distance between the grounding electrode and the point far away from the surface of the earth will not detect the change in the impedance between the earthing electrode and the new remote point. The far point of the surface is a remote earth. .
3. Earth (earth, ground): An intentional or unintentional conductive connection, due to this connection, can make the circuit or electrical equipment connected to earth or connected to the earth, some kind of larger conductor Note: The purpose of grounding is: (a) to make the conductor connected to ground have a potential equal to or similar to earth (or instead of the earth's electrical conductor); (b) to guide the earth current into and out of the earth (or in place of earth) Electrical conductor).
4. Grounding (earthing): Refers to the connection of the relevant system, circuit, or equipment to ground.
5. Ground (reference) plane [earth (reference) plane]: A conductive plane whose potential serves as a common reference potential.
6. Earthing connection: The connection used to make up the earth consists of a grounded conductor, a grounded pole, and the earth (soil) surrounding the earthing pole or a conductor that replaces the earth.
7. Protective earthing (protective earthing): Grounding one or more points of a system, device or equipment for electrical safety purposes.
8. Lightning protection grounding (lightning protection ground): lightning arrester, lightning conductor and lightning arrester lightning protection equipment and grounding device connection.
9. single-point ground (single-point ground): Single-point grounding means that only one point in the network is defined as a ground point, and other points that need to be grounded are directly connected to this point.
10. Multi-point grounding: The "ground" of each subsystem is directly connected to the nearest reference plane. Usually the datum plane refers to the thick copper wire or copper tape that runs through the entire system and they are connected to the cabinet. Connected to the ground network, the reference plane can also be the bottom plate, frame, etc. of the equipment. The length of the grounding lead of this grounding method is the shortest.
11. floating ground (floating ground): the entire network is completely isolated from the earth, so that the potential is suspended. The insulation resistance between the entire network and the ground is required to be more than 50. After the insulation is lowered, interference will occur. Usually the chassis grounding is used. The circuit is floating.
12. Earthing electrode: A conductor or set of conductors that are in intimate contact with the soil (ground) and provide electrical connection to the soil (ground) for the purpose of connection to earth.
13. Vertical earth electrode: A grounding electrode installed vertically in the soil.
14. horizontal earth electrode: A ground electrode that is horizontally installed in the soil.
15. Natural earthing electrode: It is a kind of natural earthing electrode with all kinds of metal components that are also used as grounding but not specially set up for this purpose, reinforcing bars in reinforced concrete, buried metal pipes and equipment, etc. .
16. Foundation earthing electrode: Grounding electrode in a concrete foundation of a structure.
17. Concentrated earthing device: In order to strengthen the scattered current of the lightning current and reduce the ground potential, an additional grounding device is installed. Generally, 3-5 vertical earthing plates are provided. In areas with high soil resistivity , laying 3-5 radial horizontal grounding poles.
18. Main earthing conductor: The common grounding busbars installed in buildings, control rooms, and distribution grounding terminal boards can be laid in a ring or strip shape. All grounding conductors are led by grounding busbars.
19. Earth-termination device (earth-termination system): the sum of the grounding wire and the grounding electrode.
20. Ground grid: A group of grounded poles made up of interconnected bare conductors buried in the ground to provide a common ground for electrical equipment or metal structures. Note that to reduce grounding resistance, the grounding grid can be connected with an auxiliary grounding pole.
21. Earthing system: A system that consists of all interconnected ground connections within a defined area. (Note: Including the ground electrode buried in the ground, the grounding wire, the cable shielding layer connected to the grounding electrode, and the equipment housing or bare metal part connected to the grounding electrode, the complex system of the building reinforcement, and the structure)
22. facility earthing system: A system of electrically connected conductors or conductive components that provides multiple paths to current ground. Equipment grounding system includes grounding pole system, lightning protection subsystem, signal reference subsystem and fault protection subsystem. Any conductive component such as the building rebar structure, equipment enclosures, metal pipes, etc. can be used as a device grounding system.
23. Earthing reference point (ERP): The only connection point between the common grounding system and the equipotential bonding network of the system.
24. main earthing terminal: A protective conductor, including a terminal or ground bar, that connects an equipotential bonding conductor and a working ground conductor (if any) to a grounding device.
25. main earth-terminal board: A metal plate that connects multiple ground terminals together.
26. Common earthing system. Lightning protection devices of various parts, metal parts of buildings, low-voltage distribution protection lines (PE lines), equipment protection grounds, shields, grounding, anti-static grounding, and information equipment logical grounds, etc. Grounding devices connected together.
27. Earthing mat: A group of bare conductors that are located on the ground or underground, connected to ground or to a grounding grid, to prevent dangerous contact voltages. Note: The usual shape of the ground balancer is a suitable area of ​​ground and ground grid.
28. Potential to earthing (potential of earthing connection): The potential difference between the grounding device and the zero potential point of the earth when current flows through the grounding electrode of the earthing device.
29: effective impulse length of ground electrode: The lightning impulse current of a certain amplitude and waveform flows on the ground electrode in a specific resistivity soil, and the lightning current decays to a certain percentage (such as 1%). The corresponding length.
30: Earthing system check (earthing system check): In accordance with the provisions of the relevant standards, check the reliability of equipment, building or power system, grounding system of substation or transmission line tower grounding device, and measure the grounding resistance. An Xun lightning protection device. . Com
31. Impulse earthing impedance: The ratio of the peak voltage of the grounding device to the ground and the peak value of the current flowing through the ground to the ground when the inrush current flows through the grounding device.
32. Power frequency ground resistance: The resistance between the grounding electrode and the remote earth when the power frequency current flows through the grounding device. The value is equal to the voltage of the grounding device relative to the distant earth and the current flowing into the earth through the grounding electrode. The ratio.
33. Protective earthing conductor (PE line): A conductor that is used to prevent electric shock from being electrically connected to any of the following: exposed conductive parts, conductive parts outside the device, general grounding conductors or total equipotential bonding terminals, Ground electrode, power ground or manual neutral point.
34. PEN conductor: A conductor that has the dual function of a neutral conductor and a protection conductor.
35. Earth current (telluric current): Current flowing in earth or ground.
36. Ground-return circuit: A circuit that uses the earth to form a loop.
37. Touch voltage (touch voltage): The potential difference between a grounded metal structure and a point on the ground at a distance. This distance is usually equal to the maximum horizontal extension distance, about 1m.
38. Bonding: The exposed electrically conductive parts or external electrically conductive parts of a device, device or system are connected together to reduce the potential difference between them when lightning current flows, also known as bonding, bonding.
39. Equipotential bonding (equipotential bonding): Connect separate devices and conductive objects with equipotential bonding conductors or surge protectors to reduce the potential difference between the lightning currents.
40. Equipotential bonding bar (EBB): A conductive tape whose potential is used as a common reference point. Metal devices, conductive objects, power and communication lines, and other objects that need to be grounded can be connected to it.
41. Equipotential bonding conductor: A conductor that interconnects parts of a separate device to reduce the potential difference between them when a lightning current flows.
42. Bonding network: A network of conductors that equipotentially connects exposed conductive parts of a system.
43 step voltage (step voltage): The potential difference between two points on the ground one step distance, this distance takes the length of 1m in the direction of maximum potential gradient. Note: When the staff stands on the ground or something, there is current This potential difference can be dangerous when flowing through the earth or the object, especially in fault conditions.
44. Earth resistivity: A parameter that characterizes soil electrical conductivity. Its value is equal to the measured resistance between two opposite sides of a unit cubic soil. The unit is usually ohm.m.
45. Signal ground: A common reference point for signals in a circuit, that is, reference points for signals in electrical and electronic equipment, devices, and systems.
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