Yang Fan

Research on the mechanical state parameter extraction method of high voltage circuit breakers

High voltage circuit breakers play an important role in the power system. So it is necessary to implement the state detection of breakers in order to ensure stable and reliable running of the grid. The purpose of state detection is to provide reliable basis of maintenance by extracting mechanical state parameters accurately. This paper mainly focuses on the coil current signal feature extraction algorithm. To settle the problem of too much noise mixed with the current signal and signal distortion, the discrete wavelet transform algorithm is used to extract the coil current signal parameters. This paper also designs the FIR filter to extract stroke and speed parameters from travel-time waveform. The experiments show that the difference between the theoretical results and test results processed by the method in this paper is very small and the test results are able to accurately reflect operation states and mechanical features of high voltage circuit breakers.

Integrated state test system of high voltage circuit breakers based on embedded technology

It is especially necessary to monitor the operation state of high voltage circuit breakers to ensure the smooth and safe running of power system. This paper presents the construction and principle of a designed system for diagnostic testing of high voltage circuit breakers. The test system is based on the architecture of ARM as processor and embedded LINUX as operating system. Modular design of the hardware platform is proposed. And the hardware platform consists of ARM core board, signal collection module, A/D sample module and result display module. To develop applications, the ARM is transplanted with Qt/Embedded. And the discrete-time Mallet wavelet transform algorithm is used to process coil current signal. This test system has the feature of high reliability, flexible configuration and many characteristic parameters of high voltage circuit breakers can be obtained through it.