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Analysis on the development trend of relay industry in 2015

2015-01-24 08:29

With the gradual implementation and deepening of China's ten major industrial revitalization policies, the demand and application fields of the relay will continue to expand and expand in the consolidation. "12th FiveYear" period, China's traditional electromechanical relay will remain below the growth rate of 7%-8%, the development speed of the solid state relay will be close to 15%, while the special relay will more than 20% speed rapid development. Related to the relay industry market research report shows that China's relay industry has a huge market potential.

China relay industry from the "manufacturing power" to "create power" will gradually accelerate the pace of change, from exports to domestic demand and export of racing together bridle to bridle situation will be increasingly obvious, especially highend products to enhance domestic demand, promote the trend will be more clear.

UHV relay technology is a challenge

The relay is widely used. In the power system, when the fault occurs in power system itself, endanger the safe operation of the power system, relay protection device can timely send warning signals, or directly controlled by the circuit breaker to issue a trip command to terminate the development of fault, minimizing damage to the power system component itself, can also meet a certain the requirement of electric power system. Therefore, the relay protection is called the first line of defense for the safe operation of the power grid.However, it is difficult to balance the security and rapidity of power protection, which is a worldwide problem. In the United States, the two large area blackout was triggered by the relay. In our country, more than half of the power outages were caused by the defects of relay protection in 90s.

According to academician, Chinese Engineering Institute of North China Electric Power University professor Yang Qixun introduced the development of the power grid, the application of new technology in power system, relay protection and promote the development of technology, but also makes the relay protection technology complexity increase, to challenge the traditional relay protection application mode, management mode.The rapid growth of the shortcircuit current level of relay protection requirements more quickly; DC transmission, on Application of compensation technology to relay a breakthrough in technology; the emergence of a large number of compact transmission lines, multi circuit lines on the same pole City, high voltage and short circuit, the relay protection configuration and setting and with more complex. The development of network equipment and operation control technology, such as digital substation, unattended substation application of UHV power grid construction, put forward higher requirements on the performance of relay protection technology, to study and propose new solutions of relay protection.The actual power grid and the power grid accident lessons show that single relay protection single component failure device or device, are likely to lead to the accident of power, still need to further improve the reliability of relay protection equipment.

The UHV power grid is different from the characteristics of EHV power grid relay protection, at present there are a lot of technical problems, such as UHV long line capacitance current characteristic of protection effect of arc current on reclosing influence, UHV relay protection equipment electromagnetic compatibility etc.. It is understood that China's relevant agencies to carry out a series of independent research and development work, has achieved results.

Microcomputer protection is the development direction

The development of relay protection technology is closely related to the development of electronic, information and communication technology. In the future, with the gradual application of electronic CT (current transformer) and PT (voltage transformer), the gradual improvement of the IEC61850 standard, it can be predicted that digital technology will be more widely used. There are 110 thousand volts and 220 thousand volts voltage level of electronic CT, electronic PT put into trial operation, relay protection equipment research and development for electronic CT and PT, will promote the development of the technology of relay protection, relay protection to new principle, new technology and new application of change, become the new task for the relay protection scientific research personnel.

Yang Qixun believes that the microcomputer protection is on software protection, protection than conventional transistors and integrated circuits, has a strong self checking function, protection function, high integration, high reliability, stable operation characteristics, small amount of maintenance and other significant advantages, represents the direction of development of relay protection technology.

The research of microcomputer relay protection in China started in the end of 1970s. In 1984, the first set of microcomputer line protection devices were identified and used in the system. After 20 years of development, the domestic computer protection technology continues to progress, has made many achievements and patents in microcomputer protection hardware and software algorithm, etc., has launched the four generation computer protection device, and performance indicators have been fully beyond the imported products, a leading position in the world. Domestic microcomputer protection has replaced transistors, integrated circuits and other protection, occupy a dominant position.