The paper proposes a new short- window- integral method SWI for approximate calculation of fundamental component from fault waveforms by shortening the length of sampling windows.

This paper gives a brief introduction of the UWB tag location system,proposes a project for the UWB energy detecting receiver,and gives a novel and rational design of the integral window in it,which simplifies the simultaneous capturing module of the receiver.

This paper improved the harmonic current detection method based on UPF(unity power factor),using the slipped window integral to replace the LPF(low pass filter).

This device employs the methods of 96 sample points per power cycle and short-window fast algorithm,takes fault component current differential.

A novel approach to detect,localize and classify various types of power quality disturbances in noisy condition is proposed,which is based on two kinds of transforms:short time power transform STPT and short time correlation transform STCT .