This project is a high-voltage electrical equipment condition detection/monitoring product. It belongs to the field of smart grids and the electrical equipment condition-based maintenance industry. It covers many technical fields such as high voltage and its insulation technology, signal processing technology, sensing technology, electronic circuit technology, and materials. The subject is electrical engineering.
This project is a targeted study on related technical problems such as insufficient sensitivity of sensors, randomness and complexity of on-site interference, and difficulty in identifying defect types in partial discharge measurement caused by insulation degradation and defects of high-voltage electrical equipment. It is an optimized design and transformation and upgrading of traditional partial discharge live detection/monitoring devices, adopting core technologies of wave absorption, multiple joint noise reduction, and W-T cluster separation to improve the sensitivity of the sensor. The device's signal-to-noise ratio and defect type identification ability optimize the partial discharge signal's ability to diagnose insulation faults, improve the service level of the product, and adapt to live detection and online monitoring devices in power system applications. The key innovation points of the project are reflected as follows:
Innovation point 1: The joint technology of noise and interference suppression and recognition based on various measures such as sensor absorbing technology, hardware-gated noise reduction, software wavelet noise reduction, pulse-type interference recognition, and mobile phone signal recognition effectively improves the signal-to-noise ratio., greatly improves the reliability of the product, and avoids economic losses caused to the enterprise caused by the equipment being effective and ineffective in the laboratory and on site. (Invention patent: ZL200910111221.5)
Innovation point 2: Based on ultra-high frequency conical antenna technology, a high-sensitivity and ultra-bandwidth sensor suitable for partial discharge detection of high-voltage electrical equipment has been developed. The average equivalent height within the passband reaches 17.41mm, which is much higher than the 8mm required by the State Grid Corporation's specifications. and within 12mm of similar foreign products; the measurement bandwidth is 500MHz to 3 GHz, which is equivalent to international similar products, effectively improving the sensitivity and waveform coupling capabilities. (State Grid Beijing Electric Power Research Institute Test Report 2014-040#, Scientific and Technological Novelty Search Level Search Report 20150118SH)
Innovation point 3: The interference and discharge source identification method and algorithm based on W-T cluster classification can effectively identify different partial discharge sources (defect types) and evaluate the severity of defects, breaking through the key technology of defect type identification and complex interference identification, effectively solving the localization shortcoming of existing partial discharge detection devices that are easy to obtain data but difficult to diagnose. (Invention patent: ZL200810041888.8 and 7 utility model patents)
This project has authorized a total of 3 invention patents, 7 utility model patents, and published 16 papers (67 citations). After appraisal by acceptance experts of the Shanghai City Science and Technology Commission and search by the scientific and technological achievements novelty search department, the technical level of this project has reached the international advanced level. User reports show that the device has good anti-interference performance, can well identify defect types and evaluate severity, can accurately detect and locate outgoing discharge faults, can timely and efficiently discover early potential insulation defects of power equipment, and improve the reliability of power equipment operation., improve equipment detection efficiency and reduce maintenance costs.
Through the sales of GIS partial discharge products of Xiamen Hongxiang Power Equipment Co., Ltd. and the promotion and application of key technologies by the online monitoring system of Changsha City Hongze Power Technology Co., Ltd., the products related to this project have been applied in more than a dozen provinces and cities across the country. In the past three years, the company's added output value of more than 60 million yuan, effectively reducing enterprise equipment maintenance funds and making important contributions to my country's high-quality and efficient smart grid.
Therefore, the implementation of this project will greatly improve the technical level, equipment manufacturing and application capabilities of domestic condition-based maintenance and smart grids, and drive the optimization and upgrading of the traditional electrical equipment online testing/monitoring industry, with very significant social and economic benefits.