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Research on the corrosive effect of inactive sulfur on oil-paper insulation 7

Research on the corrosive effect of inactive sulfur on oil-p...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Gao, Sihang Li, Jiajun Ke, Tingjing Liu, Yang Ding, Dong Key Laboratory of Industrial Internet of Things and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing China State Grid Chongqing Electric Power Company Chongqing Chongqing China Baoding Electric Power Corporation Baoding China State Key Lab. of Transmission Distribution Equipment and Power System Safety and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728155111

Sulfur corrosion induced by active sulfur has been proved to significantly decrease the insulation performance of oil-immersed equipment. In order to protect the oil-paper insulation from sulfur corrosion, active sulfur is cleared in the refining process of crude oil. Some inactive sulfur with high-efficiency antioxidant is still retained in the mineral oil to improve the oxidation stability of oil, such as thiophenic compounds. However, the corrosive effect of inactive sulfur on the oil-paper insulation has not yet clear. Therefore, thiophene that is the largest content of sulfide in the insulating oil was selected as the research object, a series of accelerated thermal ageing experiments of oil-paper without and with thiophene under the different high temperature were conducted, scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (SEM/EDX) and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used to characterize the corrosion degree of oil-paper insulation. The results show that no corrosive deposit was observed on the surface of oilpaper insulation without thiophene even at very high temperature, while a few corrosive deposit was accumulated on the surface of oil-paper insulation with 500 mg/kg thiophene. The corrosion degree of oil-paper insulation with thiophene had an uptrend as the increase of temperature (130°C-180°C), preliminarily indicating that thiophene may be activated in the oil-paper system under the action of overheating fault of oil-immersed transformer and posed a corrosion threat to oil-paper insulation. © 2020 IEEE.

关键词： Scanning electron microscopy

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A secure data aggregation approach in hierarchical wireless sensor networks 10

A secure data aggregation approach in hierarchical wireless ...

引用

10th International Conference on Ubiquitous Information Management and Communication, IMCOM 2016

作者： Min, Wei Chen, Ruixiang He, Shunbin Key Lab of Industrial IoT and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing China

ISBN: (纸本)9781450341424

As wireless sensor networks (WSNs) are employed in many applications, security of these networks must be ensured. Considering the limited resources of nodes in WSNs, it is a critical challenge. Meanwhile, the deployed nodes are separated and they need to cooperatively transmit the sensed data to the base station. To reduce the amount of sending data, an aggregation approach can be applied along the path from sensors node to the sink. However, usually the carried information contains confidential data. Therefore, a security aggregation approach is required. An efficient security data aggregation scheme using the renewable hash chain is proposed in this paper. The scheme provides data authentication, confidentiality and integrity for the WSNs. The system is implemented with the real nodes. The result shows that the proposed scheme is secure and efficient. © 2016 ACM.

关键词： Sensor nodes

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An efficient secure multichannel traffic management scheme in 2.4 GHz home automation network with iot functions

An efficient secure multichannel traffic management scheme i...

引用

International Conference on Machine Tool Technology and Mechatronics Engineering, ICMTTME 2014

作者： Wei, Min Wang, Ping Key Lab. of Industrial IoT and Networked Control Chongqing University of Posts and Telecommunications Ministry of Education Chongqing China Chongqing Internet of Things Engineering Technology Research Center Chongqing China

ISBN: (纸本)9783038352464

A home automation system integrates electrical devices in a house with each other. In this paper, an efficient secure multichannel traffic management scheme for wireless home automation networks with iot (Internet of Things) functions is proposed. The mechanism includes a channel resource optimization scheme by the centralized channel assignment algorithms and an intrusion detection scheme for security enhancement with the traffic management. We evaluated the performance of the mechanism by using the wireless data measured on real wireless home networks. The simulation results show that the scheme can effectively manage the multi-channel status of the networks and detect the intrusion attacks, which improve the overall network performance. © (2014), Trans Tech Publications, Switzerland.

关键词： Home networks

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Adaptive Working Schedule for Duty-cycle Opportunistic Mobile Networks

Adaptive Working Schedule for Duty-cycle Opportunistic Mobil...

引用

IEEE International Conference on Communications

作者： Huan Zhou Hongyang Zhao Chi Harold Liu Jiming Chen State Key Lab. of Industrial Control Technology Zhejiang University Hangzhou China Department of Networked Computing IBM Research Beijing China

In Opportunistic Mobile Networks (OppNets), a large amount of energy is consumed by idle listening, instead of infrequent data exchange. This makes energy saving a challenging and fundamental problem in OppNets, since nodes are typically battery-powered. Asynchronous duty-cycle operation is a promising approach for energy saving in OppNets, however, if its working schedule is not effectively designed, it may also cause significant network performance degradation. Therefore, it is pressing to design an energy-efficient working schedule for duty-cycle OppNets. In this paper, we first analyze the contact process in duty-cycle OppNets, then propose an adaptive working schedule for duty-cycle OppNets. The proposed schedule uses the past recorded contact histories to predict the future contact information, so as to adaptively configure the working schedule of each node in the network. Finally, extensive real trace-driven simulations are conducted to evaluate the performance of our proposed schedule. The results show that our proposed adaptive working schedule is superior to the random working schedule in terms of delivery ratio and delivery delay.

关键词： Schedules Peer-to-peer computing Delays Mobile communication Contacts Mobile computing Adaptation models

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System encapsulation realization of SCADA based on IEC61970

System encapsulation realization of SCADA based on IEC61970

引用

2012 IEEE International Conference on Computer Science and Automation Engineering, CSAE 2012

作者： Wang, Ting Liu, Chi Sun, Xiao-Jiang Tao, Zhi-Jian Wang, Ping Key Lab. of Industrial Wireless Network and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing China Chongqing New Century Electrical Co. Ltd. Chongqing China

ISBN: (纸本)9781467300865

As the revolution of electric power industry and software engineering technology, various heterogeneous system of dispatching automation has constantly emerged. IEC61970 standards provide integration methods foe all kinds of high efficient system. On the base of thorough research on standards, we put forward the idea of using IEC61970 to upgrade the legacy SCADA system. Besides this, we introduced the method of encapsulating Chongqing New Century Electrical Company's legacy SCADA system. This method tries the research and practice of the standard under the premise of legacy investment protection. © 2012 IEEE.

关键词： Common object request broker architecture (CORBA)

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