A device and method for testing the grounding resistance of a tower without setting a wire
A technology of grounding resistance and test rod, which is applied in the direction of grounding resistance measurement, etc., can solve the problems of difficulty in testing the grounding resistance of transmission line poles and towers, difficulty in arranging current poles and voltages, and large error in test data, so as to achieve sensitive and accurate current collection. The effect of ensuring stability and sealing performance
Active Publication Date: 2021-02-09
PANZHIHUA POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER
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Problems solved by technology
The three-pole method needs to be laid out according to the size of the ground grid. Considering the uniformity of operation, the length of 60 / 38 meters is generally used. However, for mountainous lines, the layout of current poles and voltage poles is difficult to carry out due to the influence of the site terrain.
However, during the clamp meter test, the Hall element inside the clamp meter senses the current in the grounding device. During the test, there is a gap between the clamp head and the conductor and the distance is uncontrollable. At the same time, there is an induced voltage, resulting in a large error in the test data.
In view of the advantages and disadvantages of the three-pole method and the clamp meter method, the present invention proposes a new type of testing device and corresponding method for testing the grounding resistance of towers without unwinding, so as to solve the problem of difficulty in testing the grounding resistance of power transmission line towers
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[0030] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0031] combine Figure 1-7 , a device for testing the grounding resistance of a pole tower without wiring, comprising a housing 1 made of metal or plastic, and a shielding cavity 3 for installing a test circuit main body 2 is arranged in the housing 1 . It can be understood that the casing around the test circuit main body 2 is made of metal, and the test circuit main body 2 is insulated and installed in the shielding cavity 3, which not only plays the role of shielding...
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The invention relates to the technical field of lightning protection for power transmission lines, and aims to provide a device for testing the grounding resistance of towers without unloading wires; On the operation panel, one side wall of the shielding cavity is provided with two first sealed electrical connectors connected to the test tentacles at intervals, and the other side wall is provided with two second sealed electrical connectors connected to the power supply; the test tentacles include two relatively foldable arc-shaped pieces, The two arc-shaped pieces are bent inward and one end is hinged on the upper end of the sleeve, and the other end is fixedly connected to the end of the upwardly curved arc-shaped metal shrapnel, and the bottom surface of the arc-shaped metal shrapnel is fixed with a slider; Sliding is restricted by the stop mechanism, which restricts the slide bar to slide downward in the natural state, releases the restriction on the slide bar in the folded state, and the lower end of the slide bar is electrically connected to the main body of the test circuit. The invention has a simple structure and can quickly and accurately measure the grounding resistance of the tower.
Description
technical field [0001] The invention relates to the technical field of lightning protection for power transmission lines, in particular to a device and a method for testing the grounding resistance of a tower without unloading. Background technique [0002] The tower grounding device of the transmission line is the basis of lightning protection for the transmission line. It provides a discharge channel for lightning in the thunderstorm season. In order to investigate the performance of the grounding device of the transmission line tower, the grounding resistance test of the tower needs to be carried out in the handover and operation and maintenance links. The commonly used methods are the three-pole method and the clamp meter method specified in DL / T 887-2004 "Measurement of Power Frequency Grounding Resistance of Towers". The three-pole method needs to be laid out according to the size of the ground grid. Considering the uniformity of operation, the length of 60 / 38 meters i...
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IPC IPC(8): G01R27/20
Inventor 苟凯戴炜章有君
Owner PANZHIHUA POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER