An online tester for grounding resistance of power line iron towers based on voltage excitation
A technology of ground resistance and voltage excitation, which is applied in the directions of ground resistance measurement, impedance measurement, and measurement of resistance/reactance/impedance. The ability to interfere, the effect of reducing difficulty and cost
Active Publication Date: 2020-08-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0004] In order to solve the problem of measuring the grounding resistance of the iron tower without disconnecting the grounding down conductor, the existing patent has proposed a method of measuring the current of each down conductor by adding a current detection coil on the basis of the three-wire method, which is feasible in principle, but this This measurement method requires the current detection coil to be highly accurate in measuring current, so it is relatively complicated to implement
At the same time, the traditional ground resistance meter cannot accurately test the grounding resistance of the power tower without disconnecting the downline.
Method used
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Embodiment 1
[0025] Such as Figure 1-4As shown, the present invention provides a kind of electric power line iron tower grounding resistance online tester based on voltage excitation, comprises grounding resistance tester 1, and grounding resistance tester 1 comprises belt chuck excitation part 2, no chuck excitation part 3, current sending electrode 4. The voltage sampling electrode 5 and the signal processing circuit board 6, the excitation part 2 with the chuck includes the upper sampling chuck 7, the excitation coil 8 and the lower sampling chuck 9 from top to bottom, and is installed on a grounding wire of the power line iron tower. On the downline, the exciting coil 8 is non-contact with the grounding down-conductor, the upper sampling chuck 7 and the lower sampling chuck 9 are tightly connected with the grounding down-conducting wire, and the exciting part 3 without chuck only includes one exciting coil 8, And it is installed on another grounding down conductor of the power line ir...
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The invention discloses an online tester for the grounding resistance of a power line iron tower based on voltage excitation. The online tester comprises a grounding resistance tester; the grounding resistance tester comprises an excitation part with a chuck, chuck-free excitation parts, a current sending electrode, a voltage sampling electrode and a signal processing circuit board; one set of the excitation part with the chuck is mounted on one grounding down lead of the power line iron tower; each of the other grounding down leads is provided with one set of the chuck-free excitation part. The online tester disclosed by the invention has an online measurement function so that data of the grounding resistance of the power line iron tower can be directly uploaded through an Internet of Things manner to realize network monitoring, and a manual inspection manner of the power line iron tower is effectively replaced, so that the detection efficiency is extremely improved; furthermore, key parameters are measured through touch and the testing precision is guaranteed; the production difficulty and the production cost are greatly reduced.
Description
technical field [0001] The invention relates to a grounding resistance testing technology of a power line iron tower, in particular to an online tester for the grounding resistance of a power line iron tower based on voltage excitation. Background technique [0002] As we all know, in order to ensure the safe and stable operation of high-voltage transmission lines and reduce the damage caused by lightning strikes, high-voltage transmission towers are equipped with grounding networks. In order to improve the grounding effect, in addition to the grounding network of a single tower itself, the towers are connected in turn through overhead lines. The grounding current flows into the ground through the grounding network of a single tower itself, and also flows into the ground through the grounding network of adjacent iron towers through overhead lines. Obviously, the grounding resistance of each iron tower needs to be controlled within a certain range. There are two main ways to...
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IPC IPC(8): G01R27/20G01R27/18
CPCG01R27/18G01R27/205
Inventor 彭仁军张靖郑军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA