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During the process of high voltage circuit breaker run, the change of the vibration signal reflects the mechanical state of the circuit breaker, an efficient method of extracting vibration signal features is directly related to the accuracy and practicability of fault diagnosis. In the paper, a status feature extraction based on overall empirical mode decomposition (ensemble empirical mode decomposition...
In this paper, a new method to extract characteristic parameters from vibration signal of HV (high voltage) CB (circuit breakers) is proposed based on the empirical mode decomposition (EMD)-entropy. First, the normal signal and several fault signals are decomposed with empirical mode, and then extraction and selection the IMF function. Second, calculating the signal envelope after selection in IMF...
The subsidence value is an synthesis target to evaluate the wheat quality. NIRS (Near Infrared Transmittance Spectroscopy) is a new method for quality analysis of wheat with its quick, simple, accurate and nondestructive characteristic. In this paper, spectral data were dealt with moving window average method and second differential and SNV analysis firstly, on the basis of which, the partial least...
With its quick, simple, nicety and nondestructive characteristic, NIRS (Near Infrared Reflectance Spectroscopy) is a new method for quality analysis of wheat. In this paper, a new method to model-building for wheat quality analysis with NIRS is presented. Opposite near infrared parameters shield the testing accuracy from outer disturb and random factors. Local minimization is escaped, and a high convergence...
NIRS (Near Infrared Transmittance Spectroscopy) is a new analytic technique in analytical chemistry which is developing very quickly in recent years. It has quick, simple, and nondestructive characteristic. This study is based on the analysis of wheat by near infrared spectroscopy to predict the wet gluten in wheat. Using the wavelet transform to de-noise the spectrum firstly, on the basis of which,...
In this paper, a new method that the wavelet singularity detecting and NN of fuzzy combined to process the mechanism libration signal of the HV breaker is introduced, which is called the NN of fuzzy singularity. This is a new method that the wavelet singularity exponent of fuzzification combined with the multilayer feedforward NN is imported to the mechanism fault diagnosis of the HV breaker. The...
In this paper, the macromolecule-capacitor humidity sensor, which is the transducer that can fully monitor gas humidity from 0% to 100%RH, is used to monitor the moisture of SF6. Temperature compensation and curve fitting for humidity capacitor with radial basis function (RBF) neural network are proposed. Furthermore, a circuit to realize online monitoring is presented in the paper. The result of...
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