Advanced Materials Research Vols. 1092-1093

Abstract: XLPE power cable is widely used in grid system for its series of merits, but the fault become more and more frequent with increase of the use of cable and longer run time. In this paper, the reasons of the fault are introduced and the on-line monitoring technique of XLPE power cables is presented.

Abstract: A set of measurement system for the testing of transmission lines, composing of wireless center station, wireless current acquisition and transmission nodes, wireless voltage acquisition and transmission node, was designed, which was based on wireless communication. The high speed wireless bridge working at 2.4GHz together with the clock synchronization module based on the IEEE1588 communicating protocol were both employed for the communication and time synchronization separately. The measurement system has data storage, waveform display, data analysis, automatic report generation and other functions. The measurement system can greatly reduced arrangement of cables, thereafter improved the test efficiency.

Abstract: The simulation of distribution automation troubleshooting and the functional design of training system software is discussed by this article, Including: basic platform capabilities, the decision analysis of auxiliary power failure, Power operation mode for load transfer analysis, the ring analysis of grid operation mode , the training simulator of distribution network and the data synchronization of the simulation system diagram and mode. The simulation of distribution automation troubleshooting and the effect of training system operation show the validity and effectiveness of the method.

Abstract: This paper investigates the impact of electric vehicles battery charging on the distribution system load if electric vehicles (EVs) are widespread used on roads. Stochastic approach based on a Monte Carlo method is developed in this study to simulate EVs charging load in two cases: 1) normal charge service at home, and 2) quick charge service at public charging stations. To demonstrate the model, a 22-kV distribution system of Pattaya City operated by Provincial Electricity Authority of Thailand (PEA) is employed in the case study. The results indicate the capability of the proposed model to exhibit the impact of EVs charging load on the local distribution system.

Abstract: Comparative study of impact of insulators surface pollution by magnesium silicious proppant powder and cement flour was performed in the present article. Studies were performed both for the case of charge development along polluted surface and polluted wetted surface of the insulators.

Abstract: Distribution system is the key sector for energy delivery and consumption. As the development of smart grid, more and more distributed energy resources (DER) and renewable energies are involved in the distribution system which makes the system complex than ever. However, there are several basic problems to solve for the sake of better and efficient management of distribution system. In this paper, we propose a panorama diagram automatic generation technology, which is created based on the logical relationship of devices and devices containers in distribution system and could provide panorama vision of distribution system for system operators as well as the advantages of GIS and diagram by the distribution system automation. The work in this paper is very useful for increasing the efficiency of model and data management in distribution system, and can be used in the applications of panorama dispatching in smart distribution system.

Abstract: Since the development of economics and society, secured and reliable power supply has become essential. Model and diagrams management remains the fundamental technology for distribution automation and smart distribution system. However, distribution system develops rapidly, simple model and diagrams management and maintenance with GIS would not satisfy the requirements by system operation. In this paper, we propose panorama dispatching technologies as integrative solution for smart distribution system. Firstly, the framework of panorama dispatching technologies is established; then key technologies for panorama dispatching technologies are introduced. With our proposed methods and technologies, the distribution system operators can not only manage and examine accuracy of model and diagram, but also work on a unique strategic diagram to better understand and dispatch the system with multiple levels and views of panorama diagrams. The results in this paper are very useful for distribution automation and smart distribution system.

Abstract: Load modeling by means of static voltage characteristics is a modern way to describe mode parameters influence on it. Nowadays typical curves are used, which leads to inaccuracy growth in case of networks with complex load buses. Consequently, it is appropriate to apply real characteristics with compensating devices taken into account. Also the preliminary math modeling is needed to estimate experimental data reliability and make a model form hypothesis.

Abstract: Detection of C₂H₂ gas in transformer oil is significant for diagnosing the operating state assessment of power equipment. The paper develops an infrared laser gas sensor to detect the C₂H₂ gas in transformer oil, and also introduces the system structure in detail. A gas-absorbed laser cell that contains a series of laser reflectors is designed and used in our detection system, which adds the optical path without changing the volume of the cell. 1529.16nm is chosen as the characteristic spectrum line of C₂H₂ gas, and concentration of C₂H₂ gas is quantitatively analyzed based on least square method. The experiment result shows that in certain volume fraction range of acetylene, the absorbance has a good linear relationship with the acetylene concentration, and the minimum detection limit for acetylene is 10μL/L. In general, the developed infrared laser gas sensor can detect C₂H₂ gas in transformer oil effectively.

Abstract: Demand Side Energy Management System (DSEMS) manages energy demand by controlling end-use appliances in a refined, energy-saving, cost-efficient and user-friendly way. The DSEMS runs on an Android tablet computer, which serves as energy gateway to communicate with two types of controllers via ZigBee network. Smart sockets connected to the ZigBee network will monitor and control plug-in loads and IR remote controller (IRRC) for air-conditioner temperature setting. The proposed system has been installed in an apartment with over 24 rooms as a paradigm, which proved that the DSEMS can realize the autonomous energy-saving via real-time surveillance and control on household appliances.