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Experts predict that current relay demand and application areas will continue to grow

Statistics from relevant agencies show that China's current relay industry has huge market potential. With the gradual implementation of the revitalization policy of the top ten industries, experts predict that during the "Twelfth Five-Year Plan" period, the demand and application of current relays will continue to grow. Traditional electromechanical current relays will grow at a rate of about 8%. The development speed of the relay will remain at about 15%, and the special current relay will develop rapidly at a rate of more than 20%.

UHV relay technology is a challenge. According to Yang Qixun, an academician of the Chinese Academy of Engineering and a professor at North China Electric Power University, the development of power grids and the application of new power grid technologies have promoted the development of relay protection technologies and also increased the complexity of relay protection technologies. It poses greater challenges to the traditional application methods and management methods of relay protection. The rapid growth of short-circuit current levels requires higher protection of relay protection; the application of DC transmission and series compensation technology requires technological breakthroughs in relay protection; compact lines, multiple circuits on the same pole, and high-voltage short-circuit lines in cities The large number of relays makes the configuration, setting and coordination of relay protection more complicated. The development of power grid equipment and operation control technologies, such as the research of digital substations, the application of unattended substations, and the construction and operation of UHV power grids, will place higher requirements on the performance of relay protection technology, and it is necessary to study and propose new relays. Protection solution. The actual operation of the power grid and lessons learned from power grid accidents at home and abroad show that the failure of a single relay protection device or a single component of the device may cause a grid accident, and the reliability of relay protection equipment needs to be further improved.

UHV power grids have significant characteristics that distinguish them from UHV power grids. At present, there are many technical problems in relay protection, such as the impact of UHV ultra-long line capacitor current on protection characteristics, the impact of latent supply current on reclosing, and electromagnetic compatibility of UHV relay protection equipment. It is understood that at present, relevant institutions in China have carried out a series of independent research and development work and have achieved staged results.