Author: Noyafa–CCTV Tester
Question: Answers to common knowledge of ground resistance tester Answer: Ground current: The current flowing in the earth or in the ground electrode. Grounding conductor: refers to the conductor that constitutes the ground, which connects equipment, electrical devices, wiring systems, or other conductors (usually the neutral wire Ground conductor: refers to the conductor that constitutes the ground, which connects equipment, electrical devices, wiring systems, or other conductors (usually the neutral wire) to the ground electrode.
Ground electrode: A conductor that constitutes the ground. Ground connection: The connection used to form the ground is composed of a ground conductor, a ground electrode, and the earth (soil) surrounding the ground electrode or a conductor that replaces the ground. Grounding grid: A set of grounding electrodes composed of interconnected bare conductors buried in the ground to provide a common ground for electrical equipment and metal structures.
Grounding system: A system consisting of multiple grounding connections, all interconnected, within a defined area. Grounding electrode resistance: Ohm-law resistance between the grounding electrode and the remote grounding electrode with zero potential. (Note: The so-called distant refers to a distance, at this distance, the mutual resistance of the two ground electrodes is basically zero.
) Earthing electrode mutual resistance: refers to the voltage variable generated by the 1A DC current variable of one grounding electrode in the other grounding electrode, expressed in ohms. Potential: refers to the potential difference between a point and an equipotential surface (usually a distant surface) that is considered to have zero potential. Touch voltage: The potential difference between a grounded metal structure and a point on the ground at a certain distance.
This distance is usually equal to the maximum horizontal reach, which is about 1m. Step voltage: the potential difference between two points one step away from the ground, this distance is taken as the length of 1m in the direction of the maximum potential gradient. (Note: When the worker stands on the ground or something, and there is current flowing through the ground or the object, this potential difference may be dangerous, especially in the case of a fault) (Overhead line lightning protection) Grounding electrode: refers to a conductor or a group of conductors, installed under the transmission line, located on or above the ground, but most of them are underground and connected to the tower or pole foundation.
Soil resistivity: refers to the resistance between the opposite sides of a unit cube, usually in the form ofΩ·m orΩ·cm is the unit.
Copyright © 2022 SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED - www.noyafa.net All Rights Reserved.