Y. Jing, Yan Luo, R. Zhuo, Zhiming Huang, M. Fu, Chuanhui Cheng, Meng Gao, Jianeng Zhao
{"title":"DC Breakdown Properties and Mobility Characteristics of Different Insulation Liquids Applying in Transformer","authors":"Y. Jing, Yan Luo, R. Zhuo, Zhiming Huang, M. Fu, Chuanhui Cheng, Meng Gao, Jianeng Zhao","doi":"10.1109/AEERO52475.2021.9708179","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708179","url":null,"abstract":"Transformer is a key component in power grid, and oil is still used widely as main insulating and cooling media because of its excellent property. Nowadays different kinds of oil get a lot of applications, including mineral oil, synthetic ester and natural ester, etc. HVDC systems and equipment require concrete information about dielectric property of insulating fluids under dc excitation. Therefore, it is vital to study the dielectric properties of dielectric liquids, and to understand their behaviour under both types of excitation. In this paper, DC breakdown voltage and apparent mobility of three kinds of oils were measured, and these results could give some reference to substitute traditional mineral oil in transformer.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"31 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75280255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Blind Separation of Transformer Vibration Signal Based on Sensitive IMFs","authors":"Zhen Li, Qingshuai Ren, Jing Ding, Renjie Wang, Ping Ju, Qingquan Li","doi":"10.1109/AEERO52475.2021.9708096","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708096","url":null,"abstract":"The vibration signal measured from the wall of the transformer oil tank is a mixture of various vibration source signals, and it is difficult to extract the characteristics of the transformer vibration signal and fault diagnosis. In this paper, a blind separation method of transformer vibration signal based on sensitive IMF is proposed aiming at the problem that the single-channel transformer vibration signal is difficult to separate. First, this paper analyzes the transformer vibration characteristics, and then the Intrinsic Mode Function (IMF) decomposed by the Variational Mode Decomposition (VMD) algorithm is screened and reconstructed based on the sensitive factor. The VMD algorithm is combined with the Fast Independent Component Analysis (FastICA) algorithm to separate the vibration signal. The method is verified by constructing a simulation signal according to the transformer vibration characteristics, and the method is applied to separate the transformer vibration signal to prove the effectiveness of the method.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"54 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89818190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qiong Wang, Bo Yang, Jin Guan, Bingjie Dou, W. Yang, Chuanqiang Che
{"title":"The Defective Causes Analysis for a Batch of Current Transformers Based on Simulation Tests","authors":"Qiong Wang, Bo Yang, Jin Guan, Bingjie Dou, W. Yang, Chuanqiang Che","doi":"10.1109/AEERO52475.2021.9708394","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708394","url":null,"abstract":"Recently, quality problems were found successively in more than ten current transformers (CTs), which were produced in a same batch, in Guangming switch station of Inner Mongolia province. Both the capacitance and dielectric loss did not meet the requirement of criteria. And the contents of dissolved gas in oil in those CTs exceeded the warming value. In order to explore the formative reasons of defects, the characteristics of defects in this batch of the transformers were sorted firstly. A typical CT which was used to be installed at an A-phase outgoing of the No.159 interval was selected for disassembly analysis. However, no abnormality was found in all parts of the transformer during the disassembling process. In view of this, two defective models were prepared by using the LB6-IIOW type of transformers separately. One of them was improper dried whereas the other was simply oil-immersed without using vacuum. The development process of defects in current transformer was studied. The simulation test showed that under the external applied voltage and current stresses, the capacitance and dielectric loss of models increased rapidly. And the dissolved gases were produced very fast in oil. H2 is the dominating dissolved gas followed by CH4. A small amount of C2H2 could be also found in oil. It was believed that the unsatisfactory vacuum immersion oil is the main cause for the failure of this batch of CTs. Based on this research, corresponding technical suggestions were put forward.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"129 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85748656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liang Xie, Yunxiang Cui, Hongjian Luo, G. Hua, Yunpeng Liu, Song Gao
{"title":"Experimental Study on Corona Characteristics of Ball-Plate Electrode under High Humidity","authors":"Liang Xie, Yunxiang Cui, Hongjian Luo, G. Hua, Yunpeng Liu, Song Gao","doi":"10.1109/AEERO52475.2021.9708262","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708262","url":null,"abstract":"In order to deeply study the corona problem of power fittings in high-humidity areas, an artificial humidity climate chamber was designed to conduct corona experiments on the ball-plate electrode under high humidity. During the experiments, the photon number of the ball electrode with different humidity and voltage was recorded by the ultraviolet imager. The corona initiation voltage experiments at relative humidity of 50%, 60%, 70%, 80%, 90% and 97% are conducted respectively. Under the high humidity condition of 97% with the condensing state, the corona initiation voltage experiment also was taken to compare with non-condensing state. Finally, the influence of each stage of the dewdrop development process on the electric field is analyzed through electric field simulation. The experimental results show that as the humidity gradually increases from 50% to 97%, the ball electrode’s corona initiation voltage drops from 97.5kV to 48kV decreasing of 50.7%. When the humidity is 97%, the corona initiation voltage of the ball electrode with condensation is 29.6% lower than that without condensation. Under the same voltage, the number of photons at the moment of the dew drop is the largest. In the electric field simulation analysis, as the accumulation degree of the dew drop increases, the distortion of the electric field increases, the electric field distortion is the most serious when the dew drops is consistent with the maximum number of photons in the experiment.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"468 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85790134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis and Development of Short Circuit Capability of 400MVA/500kV Single Phase Autotransformer","authors":"Zho Li, Yong Li, Yanghong Tan, Shubo Sun, Qiang Ou, Shaoyang Wang","doi":"10.1109/AEERO52475.2021.9708325","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708325","url":null,"abstract":"At present, 400MVA is the largest capacity transformer with 500kV voltage level in the world for sudden short circuit test. This paper introduces the basic parameters and development structure of the short-circuit prototype with 400MVA/500kV single-phase autotransformer. Based on the electromagnetic force characteristics, the ability to withstand short circuit of high voltage-medium voltage (HV-MV) and medium voltage-low voltage (MV-LV) is analyzed and checked. Compared with the short circuit force of 110kV and 220kV transformers prototype, the short circuit characteristics of 500kV autotransformer are analyzed, and the control strategy is put forward from the material, design and manufacturing technology. Finally, the prototype is verified by the sudden short circuit test of HV-MV and MV-LV modes. The test results show that: the prototype successfully passed the strong current impact, and the test results and various indicators are qualified, which further demonstrates the accuracy of the anti-short-circuit check and the prototype’s strong short-circuit resistance.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90268619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis of Electrical Tree Growth and Partial Discharge Stagnation in Epoxy Resin","authors":"Z. Zhang, Shusheng Zheng, Shiyou Wu, Dongchen Liu, Anxu Guan, Aixu Zhong","doi":"10.1109/AEERO52475.2021.9708171","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708171","url":null,"abstract":"The aging of electrical branch tree is an important cause for the degradation of the insulation performance of cable accessories. There are many studies on the electrical tree of epoxy modified materials, but there are few reports on the phenomenon of partial discharge (PD) stagnation of epoxy resin electrical tree. In this paper, an “integrated” epoxy resin needle-board model is made to produce electric tree. The effect of radius of curvature of the needle tips on electric tree is studied, include tree initial voltage, tree growth morphology, tree growth rate and partial discharge intermittent phenomena of electric tree. A set of experimental platform was built, and the detection sensitivity of partial discharge can reach 0.1pC. The test results show that: the larger the radius of curvature of the needle tip of the steel needle, the higher the tree initial voltage, and the higher the probability that it will develop into a vine-shaped electrical tree. The smaller the radius of curvature of the needle tip of the steel needle, the lower the tree initial voltage, and the greater the probability that it will develop into a branch-like electrical tree. The vine-shaped electrical tree has a partial discharge “stay period”, about ten minutes, while the branch-shaped electrical tree does not have a more obvious discharge stagnation phenomenon.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"22 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90660903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yong Sun, J. Yang, Jianping Li, Yukun Ma, F. Jia, Zhe Hou, Xiao Yang, B. Qi
{"title":"Comparison of Water Adsorption Effect Between Zeolite 3A and 4A in Transformer Oil","authors":"Yong Sun, J. Yang, Jianping Li, Yukun Ma, F. Jia, Zhe Hou, Xiao Yang, B. Qi","doi":"10.1109/AEERO52475.2021.9708395","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708395","url":null,"abstract":"Transformer is the key equipment in power system. Moisture is an important factor affecting its insulation performance, which will have a great impact on the electrical and mechanical life of the transformer. Because of good performance of water absorption, zeolite 3A and 4A are most widely used in liquid drying. In this paper, water absorption capacity in transformer oil with zeolite 3A and 4A from two manufacturers are tested, absorption effect is compared. And dielectric properties of oil after moisture adsorption is tested. The results show that the water absorption of zeolite 4A is better than that of zeolite 3A, and the introduction of zeolite A will increase the breakdown voltage of oil.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"23 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85084497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Power system security assessment based on real-time electromagnetic-electromechanical transient hybrid simulation","authors":"X. Xiong, Yuyao Feng, Le Zhao","doi":"10.1109/AEERO52475.2021.9708365","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708365","url":null,"abstract":"Since the modern power system presents a “double high” trend, the operation mechanism becomes more and more complicate, that puts forward higher requirements for power system simulation. Electro-mechanical transient(TS) simulation cannot fully reflect the fast response dynamic characteristics of power electronic equipment. Due to the speed, scale and amount limitation of calculation, current electro-magnetic transient (EMT) simulation cannot perform large-scale power grid simulation. Based on TS simulation software PSS/E and EMT simulation software RTDS, a real-time EMT-TS hybrid simulation platform was developed in the previous work, we extend it to a large scale AC/DC power system in this paper. As an important issue for hybrid simulation, an interface bus location method is proposed. Also, a power system security assessment method based on the hybrid simulation is presented. These above are tested in a real power system of China.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85178635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Carbon Emission Peak and Carbon Neutrality under the New Target and Vision","authors":"A. Runa, Zhiyong Zhang, Han Zhang","doi":"10.1109/AEERO52475.2021.9708209","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708209","url":null,"abstract":"At the General Debate of the 75th Session of The United Nations General Assembly in Beijing, on September 22, 2020, Xi Jinping, the President of the People’s Republic of China, has announced the target of peaking the carbon emission and the vision of carbon neutrality to the world. The establishment of Carbon Emission Peak and carbon neutral target puts forward new requirements for science and technology innovation, especially the overall layout and development direction of technology. Firstly, the carbon-neutral vision indicates that the intensity of emission reduction will change profoundly in the future. Secondly, the proposed carbon-neutral vision will have a huge impact on the energy supply side and the consumption side. It needs not only the positive response of the consumption side sector, but also the active adjustment of the energy supply side sector. Carbon was at peak, carbon neutral, commitment and decision deployment, demonstrates the strong determination to actively respond to climate change in China, reflects the push our country building bear the responsibility of the community of human destiny, shows that our country actively advocating outbreak after boosting economic “green shoots” of attitude, to play an important role in coping with global climate change.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"93 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83841061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yi Su, Shuai Zhang, Linjie Zhao, Zhibiao Xie, Zaixing Peng, Song Wang
{"title":"Research on Modular and Intelligent Design of High Voltage Circuit Breaker Mechanism","authors":"Yi Su, Shuai Zhang, Linjie Zhao, Zhibiao Xie, Zaixing Peng, Song Wang","doi":"10.1109/AEERO52475.2021.9708271","DOIUrl":"https://doi.org/10.1109/AEERO52475.2021.9708271","url":null,"abstract":"For the power system, in addition to the need for a circuit breaker to start protection to cut off the circuit when the equipment or line fails, other power outages are hoped to be avoided. At this stage, the mechanism replacement of the circuit breaker and the isolating switch still needs to be performed in the case of power failure, and the degree of modularity of the product is not high. Therefore, the modular design of the high-voltage switch not only has the value of technical research, but also has very important practical application value. In this article, we have studied a modular and intelligent scheme of circuit breaker mechanism. The integrated transformation plan of the secondary system of the circuit breaker mechanism is proposed according to the function. A scheme to ensure the output consistency of the circuit breaker mechanism is proposed to ensure the interchangeability between different mechanisms. And the monitoring IED for the breaker mechanism is designed. It has a good promotion for the digital development of circuit breaker equipment.","PeriodicalId":6828,"journal":{"name":"2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)","volume":"38 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86395879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}