Gas insulated composite electrical appliances (GIS equipment for short), as a new type of equipment, have the advantages of compact, compact, and unified aesthetics, and have been widely used in recent years. However, due to the equipment being enclosed in an insulated warehouse, when an internal fault occurs in GIS, it is difficult to inspect and observe, and it cannot be eliminated early. This requires us to study a suitable detection method that can facilitate and quickly carry out equipment status maintenance. Based on the existing research results of partial discharge detection both domestically and internationally, this article analyzes the types, causes, and hazards of partial discharge in GIS equipment, and compares various methods of partial discharge detection in GIS equipment. Based on the actual working environment of the general site, the online partial discharge detection technology using ultrasonic testing method is adopted to design the overall scheme of the GIS partial discharge detection system based on ultrasonic testing. Two different detection processes based on phase correlation and feature index are compared, and the precautions during the use of ultrasonic testing method are introduced. The typical defect criteria, typical defect graph analysis, and diagnostic standards of ultrasonic testing method are analyzed, We processed two typical discharge experiments of GIS equipment with different types and voltage levels that occurred in actual work. The experiment shows that the ultrasonic detection method can meet the requirements of real-time, accuracy, and convenience of GIS partial discharge online detection system. By collecting and accumulating on-site testing data and work experience, a more comprehensive partial discharge model has been established, continuously improving the detection system, and improving the detection effect. The paper establishes an online detection process for ultrasonic partial discharge in GIS equipment, summarizes the typical defect characteristics of partial discharge, and enables rapid online detection and location of partial discharge defects that occur inside the equipment while ensuring the normal operation of GIS equipment. The completion of the work can provide assistance for the development of maintenance plans for the reliable and safe operation of GIS equipment, effectively reducing power outage time for maintenance work, saving maintenance personnel investment, and reducing equipment maintenance costs
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China