A Soft Measurement Method of Grounding Resistance Based on Image Processing and Mathematical Model

Abstract

The invention discloses a method of ground resistance soft measurement based on image processing and a field mathematic model, and the method comprises the following steps: collecting temperature andhumidity data of different positions of soil where the ground resistance is through a temperature and humidity sensor; performing noise reduction preprocessing and normalizing for the collected temperature and humidity numerical values; collecting an earth surface image of a region where the ground resistance is through images, extracting edges, positions, colors and sizes of a pond, a wet land and a dry land through OpenCV; unifying the temperature and humidity numerical values and the image earth surface data and respectively calculating a 95% confidence interval as a detection module; processing a to-be-detected real-time data set according to the method above; respectively comparing the processed new data in the corresponding detection model, performing weighted summation for a calculation result, comparing a summation result with a system anomaly index, thereby obtaining a judgement about that the current data is failed or regular. Thus, operation and maintenance staffs are helpedto quickly find out dry points and waterlogged points, fault search time is shortened, and working efficiency is improved.

Description

technical field [0001] The invention belongs to a soft measurement monitoring method for ground electrode resistance, in particular to an image processing-based ground resistance process data modeling and fault detection method. Background technique [0002] Some conductive parts of the electrical devices and facilities in the power system are connected to the grounding pole through the grounding wire. The grounding pole is located in the plateau and mountainous area, and there are many special weather such as thunderstorms and strong winds. [0003] Since the grounding electrode equipment has no voltage for a long time, the probability of being damaged by external force is high, resulting in a high failure rate of the grounding electrode. It takes time and effort for maintenance personnel to find faults, which seriously affects the reliability of power supply. At the same time, the inspection environment is harsh, especially the regular inspection of inspection wells and se...

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Problems solved by technology

[0003] Since the grounding electrode equipment has no voltage for a long time, the probability of damage by external force is high, resulting in a high failure rate of the grounding electrode. It takes time and effort for maintenance personnel to find faults, which seriously affects the reliability of power supply

At the same time, the inspection environment is harsh, especially for the regular inspection of inspection wells and seepage wells. If the surface of the grounding pole is dry and the soil is scorched, etc., water should be injected in time to restore the humidity of the dry soil, which will seriously affect the reliability of the grounding pole. sex

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