A detection method for high-power DC electrical equipment

Abstract

The invention discloses a high-power DC electric equipment detection method. Power is supplied through a 110kV power grid, and a full-bridge rectifier device is used for outputting DC to be supplied for electric equipment detection. The no-load voltage of the rectifier is preset according to the rated voltage of the electric equipment; according to system circuit parameters and test waveform requirements, series resistors and reactors are configured; the rectifiers are inputted to output DC; after a preset breaking current peak value arrives, the electric equipment circuit is broken; related electric equipment indexes are monitored, the rectifiers exit, and the test is completed. Long-time and continuous work is realized, the output power is continuous and adjustable, and the repeated breaking test interval time is short. Various tests on the short-time bearing ability, high transient current, temperature rise, short circuit breaking capacity and the like can be carried out.

Description

technical field [0001] The invention relates to the technical field of electrical equipment detection, in particular to a detection method for high-power DC electrical equipment. Background technique [0002] With the development of electric power technology, electrical equipment such as circuit breakers, switches, transformers and reactors tend to be large in current and capacity. For the application field of low-voltage electrical appliances, the requirements for the on-off current of DC switchgear are getting higher and higher. For the development and finalization of DC electrical appliances, tests such as short-term withstand capacity, high transient current and temperature rise must be carried out. Especially for DC switches, a short-circuit breaking capability test is also required. Therefore, it is necessary to design a corresponding detection method for high-power DC electrical equipment to meet the above test requirements. At present, there are mainly two detecti...

AI Technical Summary

Problems solved by technology

[0003] There are still some problems in the current detection technology of DC electrical appliances: (1) Because of the discharge characteristics of the capacitor bank, the short-circuit discharge current provided by it is close to a sine wave, which is quite different from the short-circuit current under the actual working condition of the electrical equipment , it is necessary to control multiple groups of capacitors for multi-wave output and provide short-circuit current

All of these lead to complex motor control algorithms and cumbersome detection steps; construction costs and maintenance costs are also extremely high

And the nature of the short-circuit motor determines that it provides short-circuit current for a short time and cannot continuously output electric power

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