Research On Intensity And Positioning Of Short-gap Partial Discharge Based On Ultraviolet Pulse Detection

The design and research of the solar blind UV pulse detection system are developed by the purpose of partial discharge intensity and positioning detection in this paper.Firstly,according to the characteristics of partial discharge radiation,an ultraviolet pulse detection system based on the solar blind band is established.Then,we analyze the loss of radiant energy flow in the transmission of the system,and combine finite element analysis method and ray tracing to obtain the normalized distribution of the received energy of system with spatial position of the short-gap partial discharge source under different discharge intensities.Finally,based on the measured data,a partial discharge intensity and positioning detection scheme based on normalized distribution is proposed.The specific research is as follows:(1)The hardware module of the solar blind ultraviolet pulse detection system is developed with taking the solar blind type photosensitive tube R2868 as the core,and the software module for processing the data collected by the acquisition card is developed by Lab VIEW.We also deduce the lens parameters of the detection lens at the front end of the energy receiving of the detection system.Through calculations,it can be found that the rays within the range of sphere degree π can be coupled to the image space through the detection lens and satisfy the numerical aperture of the receiving fiber in the image space.(2)Under the design of simulation conditions,finite element analysis method and ray tracing are combined to analyze the transformation of the front-end detection lens of the system to the partial discharge radiation,and obtain the normalized distribution of focal spot in the image space of the detection lens group with the spatial position of the short-gap partial discharge source under different discharge intensity.After analysis,the above normalized distribution is not affected by the discharge intensity of the partial discharge source,and the attenuation law of this distribution is: when partial discharge source is radially away from the system energy receiving end within the detection range,the energy of focal spot decays at a speed of exponent equal to-2;When radiation source is circumferentially away from the optical axis of detection lens to the maximum angle,the energy finally attenuates to 35.6% of the maximum value.(3)In the linear region of the partial discharge intensity and the system’s impulse response,we convert the mapping of spatial position to the received energy of the system into the mapping of spatial position to pulse density,and obtain the pulse density distribution of the partial discharge source under different loading voltages.After analysis,the normalized distribution of pulse density under different voltages has the same changing law,which verifies the conclusion that the above-mentioned normalized distribution is not affected by the intensity of the partial discharge source.And normalized distribution of pulse density is basically consistent with the normalized distribution of focal spot energy.(4)On the basis of the normalized distribution as invariant,a short-gap partial discharge intensity and positioning scheme is proposed.The scheme will pre-divide different voltage levels.In the detection,the data terminal first assumes the voltage level of the partial discharge source,and combines it with the normalized distribution to obtain the pulse density quantized distribution.Then,the feasible region of the partial discharge source position is obtained by comparing the output pulse of a certain port with the pulse density quantized distribution.Finally,the location information of partial discharge is obtained by analyzing the overlap of feasible regions of multiple ports.