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Analysis on the development trend of new generation high voltage apparatus in China

2015-01-10 02:04:44Source:Electricians homePublishman:Electricians home
1, combination, complete set to meet the size of small, small, high performance, high reliability needs, there are a variety of combinations of electrical and electrical appliances. In addition, FC switchgear cabinet, multi-layer cabinet, the switch fuse combinations, high-voltage contactor fuse combination electric appliance (for FC cabinet), load switch, drop out fuse and surge arrester, and lightning arrester, isolating switch, voltage and current transformer and other combination, and has been developed the combination of complete sets of equipment level type, such as gas insulatedswitchboard (C - GIS), GIS (GIS), and the whole substation such as a combination of prefabricated substation (including transformer and high voltage electrical box changes).
2, large capacity and high parameters due to the rapid growth of modern life, the use of electricity, high voltage and large power grid to form, requires high voltage electrical capacity and various parameters to improve rapidly. At present, the main power transmission and distribution equipment rated current has increased from 2500A to 4000A, the short-circuit current has increased from 16~20kA to 31.5~50kA, and even higher. The number of single pole of 550kV circuit breaker has been reduced from 4 to 2, and the single fracture is being developed. If Chinas main power transmission and distribution voltage can not be quickly promoted, then, Chinas power grid on the high voltage electrical capacity, high parameters of the trend will not cool down (higher transmission voltage appears to be able to unlock some of the power distribution network, in order to reduce the short-circuit current of these grids).
3, mechanical and electrical integration (intelligent) due to the computer, sensor technology development and power grid automation, the need for high voltage electrical intelligent function is more urgent. Electrical equipment and advanced technology combined with the weak can significantly extend the function of high-voltage electrical appliances, to provide better conditions for the power grid automation, telecontrol, online detection. The traditional electromagnetic relay protection device, the electric meter and the control device, which is of large size, heavy weight and function, will be replaced by the multifunctional computer and sensor.
4, less, maintenance free products with high voltage electrical products using SF6 and vacuum and other excellent insulation medium and the arc extinguishing medium, as well as the establishment of advanced technology (such as CAM, etc.) based on the production process, product maintenance cycle can be extended to 10 years, and even product life maintenance free maintenance. And with the development of electronic, information technology, online testing technology to the practical use, the use of the conditions of the Department to achieve the maintenance of the state of the fault repair. Operation and maintenance will also implement the "less people, efficient, safe and reliable". In the next ten years, there is a period of great development in the future, and it will occupy a certain position in the power system.
5, phase selection, closing the circuit breaker with high voltage and large capacity power grid development system, high switching overvoltage and the fault current is detrimental to the safety and reliability of power system. The circuit breaker closing phase selection no-load line, in the rapid development of electronic control technology today is possible. Phase selection of no-load line can be the minimum limit switching overvoltage, the UHV power grid to reduce the insulation level, it is very important to improve the technical and economic level. While breaking large short-circuit current (especially above 50kA and larger asymmetric current situations) of high voltage circuit breaker burden is heavy, if we can automatically select the favorable phase (i.e. short arcing time and half wave breaking), can improve the performance of HVCB, improve the safety and reliability of power system the. Therefore, the use of advanced electronic control technology to achieve high voltage circuit breaker, closing phase selection, is the developing direction of high voltage circuit breaker.
6, non oil switch equipment in high voltage electrical industry, oil as the dielectric and arc extinguishing medium application, has a hundred years of history, is still widely used in transformer, switch. But oil medium is a kind of flammable, explosive material, and operation and maintenance is not convenient. With the rise of SF6 and vacuum switch in the switch apparatus, the use of oil switch is reduced (in 363kV and above). It can be said that the "no oil" is a trend of the development of the switch, but also an important equipment policy.