High-voltage current-limiting protection apparatus for key water-control project

Abstract

The invention discloses a high-voltage current-limiting protection apparatus for a key water-control project. The high-voltage current-limiting protection apparatus comprises a shell, wherein a microcomputer comprehensive protector and a fuse indicator lamp are fixedly mounted on the upper surface of the shell; an isolation switch operating mechanism is fixedly mounted on the front surface of the shell; an isolation switch auxiliary device is fixedly mounted on the side face of the isolation switch operating mechanism; a wall bushing is also fixedly mounted on the side face of the shell; a knocking mechanism is also mounted on the inner surface of the shell; zinc oxide assemblies are mounted at the bottom of the knocking mechanism through a high-voltage current-limiting fuse; vacuum circuit breakers are mounted at the bottoms of the zinc oxide assemblies; the number of the vacuum circuit breakers is three, and the three vacuum circuit breakers are connected in parallel; and the vacuum circuit breakers on the side face are connected with an overvoltage protector through a release. The high-voltage current-limiting protection apparatus is short in reaction time, capable of cutting off power supply in shirt-circuit fault points in time and capable of gradually decreasing the high current generated by short circuit into zero so as to protect main electrical equipment.

Description

technical field [0001] The invention relates to the technical field of large-scale electrical equipment safety equipment, in particular to a high-voltage current-limiting protection device for water conservancy projects. Background technique [0002] In large-scale hydropower projects, hydropower stations are generally built in such places. On the one hand, they can prevent floods and store water, and on the other hand, they can use the water in the reservoirs to generate electricity. With the continuous development of society, while the energy conversion rate of hydropower stations continues to increase, the power generation of hydropower generating units is also increasing. In recent years, a large number of hydropower stations have basically reached an installed capacity of more than one million megahertz. Increasing, then higher requirements are placed on the high-voltage facilities of the hydropower station. [0003] In large-scale equipment, once a failure occurs, it ...

AI Technical Summary

Problems solved by technology

[0004] In large-scale equipment, if a circuit breaker is used, the actual breaking time of the circuit breaker, that is, the sum of the relay protection action time and the circuit breaker cut-off time, is generally greater than 80ms. Before removing the system open-circuit fault, all equipment including the main generator and main transformer will be impacted by the short-circuit current of more than three cycles, which will cause serious damage to the equipment and shorten the service life of the equipment. Therefore, this protection The equipment cannot meet the needs of large hub projects

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