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A low-voltage power line carrier channel noise test system and method for field use

A low-voltage power line and noise test technology, applied in the direction of noise figure or signal-to-noise ratio measurement, can solve the problems of insufficient analysis function, poor portability, large size, etc., and achieve the effect of strong anti-interference ability, low cost and high sampling rate

Active Publication Date: 2015-08-19
CHINA ELECTRIC POWER RES INST +2
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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.

Method used

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  • A low-voltage power line carrier channel noise test system and method for field use
  • A low-voltage power line carrier channel noise test system and method for field use
  • A low-voltage power line carrier channel noise test system and method for field use

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Embodiment Construction

[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] This embodiment proposes a low-voltage power line carrier channel noise test system for use in the field. The test system includes a transformer, a coupler, a data acquisition card and a signal processing device; the transformer is a power frequency transformer, and the power frequency transformer is stepped down The power frequency signal of the power line is used as the reference power frequency signal of the data acquisition card, and the data acquisition card collects the signal on the power line of the grid through the coupler, and transmits it to the signal processing device, and the signal processing device The data is analyzed in the time domain and the frequency domain, and the specific connection is: the transformer and the coupler are connected in parallel to the power line of the power grid, and the out...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/26
Inventor 李建岐褚广斌李勍陆阳赵涛
Owner CHINA ELECTRIC POWER RES INST
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