Source: China Automation Network
Agency statistics show, our country relay industry has tremendous market potential. Along with the ten industry promotion policy fulfil gradually, experts predict, " 12th Five-Year Plan" requirement, relay and applications will continue to grow and develop, the traditional electromechanical relay will be about 8% of the speed of growth, solid state relay growth rate will be maintained at around 15%, special relay to be 20% above speed development of.
Ultra high voltage relay technology challenge
According to the Chinese Academy of engineering, the North China Electric Power University professor Yang Qixun introduction, the development of power system, power grid and application of new technology, in the promotion of the development of relay protection technique at the same time, also makes the relay protection technology of the complexity is increased, the traditional relay protection application mode, management mode and challenge. The short-circuit current level of rapid growth requirements of relay protection has higher speed; DC transmission, series compensation technology to relay protection technical breakthroughs; compact line, same rod back line, city high voltage short circuit appeared in large numbers, the relay protection configuration, setting and with more complex. Power equipment and operation control technology development, such as the characteristics of digitized substation, unattended substation, the application of UHV power grid construction operation of relay protection, technical performance and higher requirements, need to study and put forward a new relay protection solution. Actual operation at home and abroad and the power grid accident lesson makes clear, single relay protection device or device for single fault, may have led to the power grid accident, still need to further improve the reliability of relay protection equipment.
While the special high-voltage power grid has difference in EHV power grid features, protection at present there are many problems, such as ultra high voltage long line capacitance current on protection effect, secondary arc current on reclosure effects, ultra-high voltage relay protection equipment electromagnetic compatibility etc. Reportedly, at present our country relevant institutions to carry out a series of independent research and development work, has obtained the positive result of level sex.
Microcomputer protection is the development direction of
Relay protection technology development, and electronic, information, communication technology closely related to the development of. The future, along with the electronic type CT ( current transformer ) and PT ( voltage transformer ), the stepwise application, IEC61850 standardized protocol was further improved, can foreknow, digital technology will be more widely applied. There are 110000 V, 220000 V voltage electronic CT, electronic PT put into trial operation, R & D applicable to electronic CT and PT relay protection equipment, will promote the development of relay protection technology, to drive the relay protection principle, new technology and new application changes, becomes suspends in front of relay protection researchers new topic.
Microcomputer protection is to rely on software protection function, compared with the traditional transistor, integrated circuit protection, has strong self-checking function, protection function, high integration, high reliability, stable action properties, little maintenance and other significant advantages, represents the direction of development of relay technology.
Microcomputer relay protection research in China started in the nineteen seventies end. On 1984, the first set of domestic computer line protection device in the system is obtained through the identification and application. After 20 years of development, the domestic micro computer protection technology continues to progress, in microcomputer protection hardware, software, algorithms and achieved a lot of achievements and patents, has launched the four generation microprocessor-based protection device, the performance and operation index has been fully imported products beyond, in a leading position in the international. Domestic microcomputer protection has been replaced by the transistor, integrated circuits and other protection, to occupy a dominant position.
Industries with high barrier characteristics
Power equipment is divided into a first device and a two device, a device to directly bear the generation, transmission, substation, distribution, electric function of the equipment, such as generators, transformers, low technology content, domestic manufacturers more, competition is intense. The two device to a normal operation of the equipment and realize the electric management objectives for various equipments, such as generator protection, dispatching automation system. The same equipment, two production equipment has a high trade barriers, the product of the industry brings together modern electronic technology, communication technology, computer and network technology, with high technological content and high added value, is typical of the high-tech industry. Although China relay industry after years of development, has achieved the results attract people's attention, but at present domestic has the capacity to produce two equipment business still can be counted on one's fingers.