Online measurement method and device for grounding resistor of rod tower

Abstract

The invention provides an online measurement method and device for a grounding resistor. By using a meter clamping method, four pairs of potential transformers PT and current transformers CT are respectively connected on two anti-lightning wires at the left end and the right end of a rod tower. Voltage signals are sensed to the anti-lightning wires through the potential transformers; current signals are collected and measured, and the current signals are subjected to signal processing steps such as filtering and amplifying to obtain relation of feedback current and inductive voltage; and finally, the resistance of the grounding resistor of the rod tower to be measured is obtained by a special calculation method. With the adoption of the online measurement method and device, data measurement is carried out on the top of the rod tower. The online measurement method and device can be suitable for the rod tower containing a plurality of down leads, so that the anti-theft problem can be solved, and the grounding resistor can be rapidly and accurately measured.

Description

Technical field [0001] The invention belongs to the high-voltage technical field of electric power science, and relates to a method and device for online measurement of grounding resistance, which is applicable to towers containing multiple down-conductors, and can transmit data remotely to realize remote fast and accurate grounding resistance Measurement. Background technique [0002] The grounding resistance value is an important technical index of the transmission line grounding system. If the grounding resistance of the equipment exceeds the normal range, when an electric shock occurs, it will cause serious damage to the power system equipment. In order to ensure the safe and reliable operation of various electrical equipment using the electrical equipment grounding device, the grounding resistance value of the grounding system must be regularly measured and checked according to regulations. However, due to the large number of towers in the power transmission system, t...

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Problems solved by technology

[0003] In order to overcome the problem that in the existing grounding resistance testing method, testers must arrive at the testing site and must untie the redundant down conductors of the tower, the present invention proposes a method and device for on-line grounding resistance measurement, the method and device On the one hand, it can realize the automatic measurement of the grounding resistance of towers with multiple down conductors, and at the same time, it can realize the automatic remote transmission of the measurement results to the central server and store them

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