Grid is an important basic industry in economic and social development and an important link in the country's energy industry chain. In order to ensure the sustainable development of China's energy and economy in the future, the State Grid Corporation of China proposed a smart grid development model that meets the needs of China's energy strategy and power grid enterprises. Smart grid is the power grid is intelligent, is based on integrated, high-speed two-way communication network based on. Achieve the goal of reliable, safe, economical, efficient, environment-friendly and safe use of power grid through advanced sensing and measurement technology, advanced equipment technology, advanced control methods and advanced decision support system technology. According to Martin Hauske, a senior power expert at IBM China, the smart grid has three implications [1]. The first is to use sensors to monitor the operation of key equipment such as power generation, transmission, distribution, and power supply in real time. The data are collected and integrated through the network system. Finally, the data are analyzed and tapped to achieve the optimal management of the entire power system operation. On May 21, 2009, "2009 UHV Power Transmission Technology International Conference", Liu Zhenya, general manager of State Grid Corporation of China, said that the active development of smart grid has become a new trend of world power development. By 2020, China will fully build a unified Strong smart grid. China's national grid combined with the basic national conditions and UHV practice, established the goal of accelerating the construction of a strong smart grid, that is, to speed up the construction of UHV grid as the backbone network, coordinated development of all levels of power grids, with information, digital, automation, interactive Features a unified strong smart grid. In order to improve the safety and stability level of smart grid and the benefits of network equipment management, it is necessary to strengthen and enhance the monitoring capability of grid facilities. Effective methods and state-of-the-art technologies for sensing the status of power transmission and transformation equipment, sensing technology, status assessment, information technology and communication support Technology to carry out technical research and engineering applications. State Grid Corporation has decided in July 2009 to comprehensively promote the implementation of state maintenance from 2010 to enhance the overall level of intelligent equipment to promote the use of intelligent devices and technologies to achieve online warning of power grid security and intelligent monitoring equipment. 1 smart grid and the traditional grid in the state detection differences 1.1 The status quo of traditional power grid status detection technology State maintenance is based on the current actual working condition of the equipment. Through advanced condition monitoring means, reliability evaluation means and life prediction means, the condition of the equipment is judged, the early signs of the fault are identified, the fault location and its severity, the trend of fault development Make a judgment and based on the results of the analysis, diagnose the equipment before the equipment performance drops to a certain extent or the fault will occur before the repair [2]. The efficient maintenance of state maintenance requires a large amount of equipment status information, which provides the basic data for equipment status evaluation and status maintenance strategy formulation. Equipment status information including inspection, operating conditions, live testing, power outage routine tests, power outage diagnostic test data. With the development of state detection technology, people are realizing more and more clearly that the "three-in-one" detection mode of "live testing, on-line monitoring and power failure overhauling test" represents the development direction of the state detection technology for power transmission and transformation equipment in the future. Live detection Generally, portable detection equipment is used to carry out on-site detection of equipment status during operation. The detection method is live for a short period of time, which is different from long-term continuous on-line monitoring [3]. In the live detection technology, the main live detection technologies currently used at home and abroad include: chromatographic analysis of oil, infrared temperature measurement, partial discharge detection, live current detection of iron core, UV imaging detection, capacitive live detection of capacitive equipment, gas leakage live detection, One of the most commonly used, the most effective is PD detection, oil chromatography and infrared temperature measurement techniques. Especially PD detection technology, it is the most rapidly developed, the most effective detection of electrical equipment insulation defects live detection technology. In the field of online monitoring technology, the current application is mainly concentrated in the substation equipment, and transmission lines and cables are gradually emerging some applications. For substation equipment, transformers and reactors used on-line monitoring techniques include: oil chromatography, PD, core grounding current, casing insulation, top oil temperature and winding hot spot temperature; CT, CVT, coupling capacitance and other capacitive devices are mainly its capacitance and dielectric loss monitoring; arrester main monitoring leakage current; and circuit breakers , GIS technology and other switch main line monitoring apparatus includes a switching mechanical properties, GIS PD, SF6 SF6 gas leakage and the micro-water density. Among them, the application is more mature and effective: on-line monitoring of transformer oil chromatography, capacitive equipment and arrester on-line monitoring. For transmission lines, the main monitoring methods currently used mainly include lightning monitoring, insulator contamination, tower tilt, wire sag and other monitoring techniques. However, the more mature ones are lightning monitoring and insulator contamination monitoring. For power cables, the main online detection method is temperature and PD, the relatively mature is distributed optical fiber temperature measurement. In the blackout maintenance test, both at home and abroad have formed a set of mature preventive test methods and procedures. State inspection and assessment work in China is still in its infancy. The problems in the application and promotion of state detection technologies are as follows: (1) The application of state detection technology is not extensive. Compared with the total amount of power grid equipment, the equipment coverage of the application of condition monitoring technology But also at a low level; (2) the status of the detection device is not high reliability, there is a false positive phenomenon, and the device failure rate is high, the workload of operation and maintenance more; (3) the lack of uniform standards and norms guidance, the manufacturers The working principle, performance index and operation reliability of the device are quite different. At the same time, the verification methods, output data specifications and monitoring platforms of various devices are different. (4) There is a lack of in-depth and effective comprehensive state assessment methods. The online monitoring technology needs to be further studied. The existing on-line monitoring technology still has blind area in equipment defect detection, the state parameter is not rich enough, and the effect of early warning on sudden failure is not obvious. (6) The lack of uniform assessment, evaluation and guidance Industry management agencies. 1.2 Smart Grid and the traditional power grid in the state of detection differences The acquisition of state information by the smart grid will greatly change from the traditional grid. In the future, the state information of the smart grid not only includes the status information of the power grid equipment, such as the health status of the power generation and transmission and transformation equipment, economic operation curves, etc., but also the real-time information of the grid operation such as the operating conditions of the generator set, Status, trend information, etc .; there should be natural and physical information, such as: geographic information, breath information [4]. Traditional grids have low levels of access to and use of information and make it difficult to form a system-level integrated business application. Smart grid will be communication technology, Blow Molding Machine,Pet Bottle Blowing Machine,Blow Moulding Machine Shen Zhou Machinery Co., Ltd. , http://www.szmouldmachine.com
Smart Grid State Detection: How Forty One Fortitude?
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