Grounding system grounding resistance online monitoring system, online detector and monitoring method

Abstract

The invention discloses an earthing system earthing resistance online monitoring system. The system comprises an earth electrode, an earthing resistance monitor and a perpetual auxiliary pole arranged at 1-3 m under the ground which are connected in sequence to form a loop, wherein the earthing resistance monitor comprises a main controller module, a sound and light alarm module, a data output module, a display module, a data processing module which are connected to the main controller module and a connecting A end and a connecting B end, wherein the data processing module is connected to a high frequency electric potential generation module and a high frequency current pickup module which obtain an electric potential U and an excitation current I respectively, accordingly a resistance value R=U / I is calculated in the loop. The earthing resistance monitor is connected to the earth electrode and the perpetual auxiliary pole through a 5 square sheath annealed copper wire separately. The high frequency electric potential generation module generates frequency of 1.5 KHz and a pulse electric potential U with the amplitude of 60 V. The earthing system earthing resistance online monitoring system can online monitor an earthing system in real time, has the functions of storage, display, teletransmission and sound-light alarm, and can be applied in a long term after being installed and debugged.

Description

technical field [0001] The invention relates to the technical field, in particular to an online monitoring instrument for grounding resistance of a grounding system. Background technique [0002] In petrochemical, electric power, construction, industrial and mining enterprises, communications and many other industries, in order to prevent the equipment from being damaged by lightning current after being struck by lightning or the occurrence of explosive accidents, the equipment is connected to the grounding system buried underground around the equipment through down conductors. The grounding system is a general term for a grounding body consisting of multiple metal grounding electrodes buried at a certain depth underground and connecting these grounding electrodes to each other to form a network structure. The smaller the grounding resistance of the grounding system, the faster the lightning current will be released into the ground, and the less likely it will damage the equ...

AI Technical Summary

Problems solved by technology

The surface of the general grounding system will be hardened by cement or steel structure, so that the two auxiliary poles cannot be inserted into the ground; the maximum diagonal line of a large-scale grounding system is hundreds of meters or even thousands of meters long, and the voltage drop method requires the test line The length needs to be longer, and the on-site conditions are difficult to achieve, so the measurement accuracy is difficult to guarantee; the main function of the large-scale grounding system is lightning protection. By increasing the number of grounding electrodes, the grounding resistance of the grounding system can be maximized and reduced, so that the lightning current can be quickly released into the earth

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