January 12, 2021 2:30 pm，By Graduate School of Shandong University、Sponsored by the Postgraduate Affairs Department of the Party Committee，The 4th (total 993) "Jixiafeng" postgraduate academic forum hosted by the School of Electrical Engineering was held in the lecture hall on the fourth floor of the Electric Power Building on Qianfoshan Campus。In this forum, we have invited Cheng Xueqi from Shandong Electric Power Company、Yong Jun、Three experts from Gu Chao，The topics of the lectures are "Transmission Line Operation and Maintenance and New Technologies"、"UHV DC transmission technology and equipment" and "UHV transformer operation and maintenance analysis and detection technology"。This forum is hosted by Professor Li Qingquan。
Lecture begins，Researcher Cheng Xueqi focuses on basic knowledge of transmission lines、Problems in line operation、New technology applications and new equipment for power transmission and transportation inspection、The application of new materials unfolds in four aspects，A brief introduction to AC and DC UHV transmission、Basic knowledge of transmission lines、Major problems in the operation of transmission lines、New equipment for power transmission operation、New Technology。Researcher Cheng Xueqi first introduced the classification of lines according to function and voltage level，And the development history of Shandong Power Grid overhead lines、Scale、Advantages, Disadvantages, etc.，Focus on the characteristics of UHV AC and DC lines and the composition of overhead lines，simultaneously，Researcher Cheng Xueqi mentioned，The current "double-high" pattern with a high proportion of new energy and a high proportion of power electronic equipment access、The rapid development of the new generation power system with the "double-new" characteristics of new equipment and new technologies，The "double carbon" goals of carbon peaking and carbon neutrality are proposed and accelerated to achieve them，The power grid is always facing the test of "double peak" power balance during summer and winter peaks and morning and evening peaks，These are the new requirements that State Grid Corporation of China will face in energy transformation in 2021。Continue，He pointed out that line tripping is the main problem in operation，And introduced in detail the external force damage、Lightning strike、Bird damage、Dancing、Wind bias、Causes of line tripping caused by pollution flashover。Continue，Researcher Cheng Xueqi mentioned the development and application of new technology drone inspection in power transmission inspection，And composite cross arm tower、Special wire - carbon fiber composite core aluminum stranded wire、Anti-bird device - umbrella-shaped anti-bird thorn、Factory composite spraying of anti-pollution flashover paint、The application of new equipment and new materials such as smart line construction and three-dimensional digital grid in contemporary power grids，Making great potential for future power grid development。
Continue，Researcher Yong Jun briefly introduces the principle and development history of DC transmission，Converter station layout、Description of main equipment functions，And introduced the overview of State Grid Corporation of China’s overseas DC projects。Researcher Yong Jun first gave a brief overview of UHV AC and DC transmission，For basic DC transmission system、Type、A brief introduction to the advantages, disadvantages and development history，Conducted a key analysis on the principle of DC transmission，The structure and characteristics of the basic commutation component - thyristor，Basic converter unit - control strategy and function of converter valve, etc.。Continue，He used the video to introduce the operation and operation-related matters of the converter transformer，And introduced in detail the layout and functions of the main equipment of the converter station。Continue，Researcher Yong Jun mentioned 7 typical operating modes of conventional UHV DC，1 type of complete bipolar balanced operation，Yiji Complete、One pole 1/2 operation 8 types，8 types of 1/2 single-pole geodetic loop operations，8 types of 1/2 unipolar metal loop operation，1/2 bipolar balanced operation 16 types，Complete single-pole geodetic loop operation 2 types，2 types running with complete unipolar metal return line。final，Researcher Yong Jun talks about the Beautiful Mountain Project in Brazil、A brief introduction to the international typical DC projects of State Grid Corporation of China such as Pakistan’s Murrah DC Project。
Continue，Engineer Gu Chao briefly introduced the operation of UHV AC transformers and converter transformers，And new technologies for status detection/monitoring。Engineer Gu Chao first conducted a simple analysis of the operation of UHV transformers in Shandong，He said，State Grid Shandong Electric Power is responsible for the operation and maintenance of 5 1000kV UHV AC substations，Respectively: Quancheng Station、Channgle Station、Gaoxiang Station、Caozhou Station and Weishan Lake Station，±2 800kV UHV converter stations，Yinan converter station and Guanggu converter station respectively，And from a yearly perspective，The number of transformer defects has decreased，Indicates manufacturing quality、Factory acceptance has improved，But compared with foreign manufacturers, the technology needs to be further improved，simultaneously，Engineer Gu Chao also analyzed transformer equipment problems，Mainly problems with insulation quality、Component failure and improper design, etc.。Continue，Engineer Gu Chao introduced the status detection technology of transformers，Commonly used status detection methods mainly include routine power outage tests、Diagnostic Test、Live detection and online monitoring，And，Electrical equipment before or during failure，Usually accompanied by "heat、voice、Light、Electricity、Water、Gas" and other fault characteristic information，corresponding to infrared thermal imaging detection、Ultrasonic testing、UV discharge detection、UHF method、New technologies in status detection such as DGA are applied to equipment detection in power systems。final，Engineer Gu Chao used several practical examples of transformer anomalies and high resistance anomalies to illustrate common emergencies in operation and maintenance management，This illustrates the importance of daily operation and maintenance management。
In the subsequent question and answer session，Cheng Xueqi、Yong Jun、Three experts Gu Chao answered the questions about the power grid work for the students one by one、UHV AC and DC、Questions about the application of drone inspections，Professor Li Qingquan also put forward his own opinions on the lecture content。This issue of the "Jixiafeng" postgraduate academic forum ended successfully with the applause of the audience。
Speaker’s introduction:
Cheng Xueqi，Engineering Technology Application Researcher，Member of the Technical Committee for Standardization of Insulators in the Electric Power Industry，Professional and technical talents enjoying government subsidies，Winner of the "Medal for Enriching the People and Prospering Lu"，Mainly engaged in professional management of transmission line operation, maintenance and repair。Participate in multiple scientific and technological research，Among them4Won provincial and ministerial level science and technology awards, authorized invention patents7item, published paper10The remaining articles。
Yong Jun，Engineering Technology Application Researcher，Professional leading talents of State Grid Corporation of China，Mainly engaged in professional management of operation, maintenance and repair of converter stations。Participate in multiple scientific and technological research，Among them6won provincial and ministerial level Science and Technology Progress Awards；Participated in the compilation of "Transmission Line Protection Manual"、"Construction Technology for Electrifying Small Towns (Central Villages) and Motor Shafts", etc.16This book.
Gu Chao，Senior Engineer，Long-term engaged in technical supervision of power transmission and transformation equipment、Status Assessment、Scientific research and development work，National Transformer Standardization Committee、Member of the Electric Power Industry Transformer Standardization Committee and High Voltage Test Standardization Committee，Acquired China Electric Power、Second Prize of Shandong Province Science and Technology Progress Award1item, first prize of State Grid Corporation of China’s Scientific and Technological Progress Award1Item.
