Grounding resistance measuring system

Abstract

The invention relates to a grounding resistance measuring system which mainly consists of a measuring device, a transmitting system and an upper computer, wherein the measuring device and the upper computer are connected through the transmitting system, and detected data of the measuring device is transferred to the upper computer for treatment through the transmitting system. Compared with manual measurement, the grounding resistance measuring system can save the cost, improve the measurement precision and collect the updated measured data at any time.

Description

technical field [0001] The invention relates to the field of electric power equipment, in particular to a device and system for measuring grounding resistance. technical background [0002] Lightning is a special weather phenomenon caused by the discharge of cloud in the air. Lightning is an important cause of damage to electronic equipment, which threatens the safe and stable operation of electronic information systems in various fields such as construction, railways, civil aviation, communications, industrial control, and military. Lightning protection is one of the measures to solve the above problems. In the current field of lightning protection, the setting of grounding devices has become one of the most critical links. It not only involves lightning discharge, but also has more to do with personal safety, equipment safety and system normality. Now various technical standards and specifications have express provisions on the specific settings of the grounding device, s...

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Problems solved by technology

[0003] At present, the grounding device adopts a metal structure and is buried below the ground. It is usually affected by many on-site environments, which makes the grounding resistance value inconsistent with the installation. For example, the decline of groundwater level and the evaporation of soil moisture all lead to the increase of soil resistivity. , so that the grounding resistance value increases, and the grounding device is buried underground for a long time, and its own corrosion changes will also cause changes in resistivity

The increase of the grounding resistance value will directly affect the effect of lightning protection, and even lead to abnormal operation and damage of system equipment. Therefore, it is very necessary to know the status of the grounding resistance in real time

[0004] In the prior art, the grounding resistance measurement measure is to manually measure and record the grounding resistance of the grounding device every year. If the requirements cannot be met, the grounding device must be modified or reset.

The problems of this method are: 1: The cost of manual measurement processing once or several times a year is high, and in some places with harsh environments or unattended, resistance detection is very difficult; 2. There is a certain cycle or cycle in manual regular detection Longer, the data obtained by the secondary detection in one cycle may not be the data under normal conditions, and the data is not representative; 3. During the interval that cannot be detected in real time, the grounding device is damaged and fails or the resistance value changes. 4. For systems and equipment with high sensitivity, the requirements for grounding resistance are also high, and the change of its resistance value needs to be recorded in detail. It is difficult to do it by regular measurement, and The workload is huge; 5. Due to the differences in people, testing equipment and testing methods in manual measurement, the value of grounding resistance will vary greatly, and the accuracy is not high; 6. The inaccuracy of manual measurement data makes the data cannot be used for research Basic data cannot provide a basis for scientific and reasonable setting of grounding devices in various environments

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