Spot low-voltage power line carrier channel noise testing system and method thereof

Abstract

The invention discloses a spot low-voltage power line carrier channel noise testing system and a method thereof. Noise testing of a time domain and a frequency domain is carried out through a specially-designed coupler and a high-speed and multichannel data acquisition card, time domain waveform display of noise signals is achieved through testing software in a laptop, fast Fourier transform algorithm (FFT) is carried out on time domain data through the software, and noise frequency domain waveform (power spectral density) is obtained. When the waveform is observed, computer date storage resources can be used at the same time to carry out long-time data storage and monitoring so that recording, analyzing and assessing on low-voltage power line noise characteristics can be achieved. Meanwhile, the spot low-voltage power line carrier channel noise testing system and the method thereof have the advantages of being flexible, convenient and fast, and suitable for various low-voltage power line environments.

Description

technical field [0001] The invention belongs to the field of power system communication, and in particular relates to a low-voltage power line carrier channel noise testing system and a method thereof for on-site use. Background technique [0002] The power line network is one of the largest networks in the world, and the power line communication uses the power line network as a communication channel. The use of low-voltage power line networks for communication has broad application prospects, covering the range from transformers to individual residential electricity meters and all household appliances. However, the power line is not an ideal communication medium, which has the characteristics of harsh working environment, large noise interference and strong time variation. The noise of the power line is mainly generated by various electrical equipment working in the power grid. The electrical equipment working in the power grid is different at different times and locations...

AI Technical Summary

Problems solved by technology

Because spectrum analyzers and digital oscilloscopes are high-precision professional signal testing instruments, they are bulky and poor in portability. They are only suitable for laboratory environments and are not suitable for use in various complex power sites; in addition, separate oscilloscopes and spectrum analysis The instrument can only be used for real-time observation of signals, and cannot be used for long-term continuous measurement and storage. In addition, it has shortcomings such as insufficient analysis functions.

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