A system and method for time-frequency analysis of cable partial discharge pulse signal based on FPGA

Abstract

The invention discloses a cable local discharging pulse signal time frequency analysis system and method based on an FPGA. The system comprises multiple external ADCs, an external MCU, the FPGA, a function calculation module and the built-in control logic. The external ADCs are used for acquiring local discharging pulse signals, and inputting the local discharging pulse signals to corresponding channels in the FPGA. The external MUC transmits pulse width information to the FPGA through the gpme or emif, and the FPGA intercepts the local discharging pulse signals. The FPGA comprises multiple parallelly arranged internal memories and is used for storing and calculating required local discharging pulse signal data. The function calculation module consists of multiple multipliers, dividers and a Fourier transformation module in a serial manner, and is used for finishing time frequency conversion calculation of each pulse signal. The built-in control logic comprises multiple reading address and writing-in address lines, and is used for operating the internal memories. According to the invention, a problem of high time consumption for achieving time frequency conversion of the traditional ARM or DSP is solved; and time frequency conversion can be excellently and highly efficiently finished.

Description

technical field [0001] The invention belongs to the field of cable partial discharge detection, in particular to an FPGA-based time-frequency analysis system for cable partial discharge pulse signals, and also relates to a video analysis method. Background technique [0002] The power system plays a huge role in national production and life. High-voltage cables are the main way of power transmission, and the normal operation of the cables is the basis of the power supply system. Partial discharge detection is one of the guarantees for the normal operation of the power cable system. The phenomenon of partial discharge will cause different degrees of damage to cables, affect the transmission and use of electric energy, and cause economic losses. [0003] The causes of cable partial discharge include local moisture in the cable, insulation damage, air bubbles in the cable head, and burrs on the cable surface. The detection of partial discharge is of great significance to the...

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