Transformer station mixed noise separation method

A technique of mixing noise and separating methods, applied in the direction of noise figure or signal-to-noise ratio measurement, etc.

Active Publication Date: 2016-04-13
STATE GRID CORP OF CHINA +1
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  • Abstract
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Problems solved by technology

The existing prediction method is the result of only considering its own noise
However, in some specific environments...

Method used

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  • Transformer station mixed noise separation method
  • Transformer station mixed noise separation method
  • Transformer station mixed noise separation method

Examples

Experimental program
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Embodiment 1

[0084] Such as Figure 1-9 As shown, the inventive method of this example is a method for separating independent transformer body noise, fan noise and corona noise, and the method includes the following steps:

[0085] 1. Determine the noise characteristics of substation body noise, fan noise and corona noise.

[0086] Figure 1-Figure 6 Shown are the time-domain waveforms and spectrograms (ie, voiceprints) of various types of noise obtained through experiments. Transformer body noise is periodic noise with obvious line spectrum characteristics, and its energy is concentrated on 100Hz and a series of harmonic frequency components (the upper limit of energy distribution is about 1000Hz); fan noise of cooling equipment is typical white noise, and its energy is in a wide range Evenly distributed within the frequency band; and AC corona noise is a collection of a series of short-term sound pulses.

[0087] Second, first separate the noise of the transformer body

[0088] Assum...

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Abstract

The invention relates to a transformer station mixed noise separation method. The method comprises: firstly obtaining noise characteristic frequency spectrum and a vocal print graph of a main noise source in a transformer station, after extracting 100 Hz and a series of harmonic frequency components in the frequency spectrum, through fourier inversion, obtaining a time-domain signal of body noise; through difference on frequency spectrum characteristics, realizing separation of body noise; then using characteristics of corona noise on time domain, that is, short-time characteristic of pulse; using a wavelet analysis method to identify occurrence of short-time pulse in a noise signal, separating to obtain the corona noise; and finally obtaining fan noise. The method provides theoretical foundation and evaluation method for noise inspection and acceptance and noise abatement under actual operating conditions in a transformer station.

Description

Technical field: [0001] The invention relates to a noise separation method, in particular to a substation mixed noise separation method. Background technique: [0002] In the field of environmental technology in places such as substations, it is a basic condition for the design of power transmission and transformation projects that the noise at the boundary of the substation meets the requirements of relevant national environmental standards. Predicting the noise in a long-term is of great significance for reasonably determining the design parameters of substations and lines, ensuring safe and reliable operation of substations and lines, reducing project construction and operation costs, and meeting environmental protection requirements. According to the completion acceptance monitoring and analog monitoring results, the power frequency electric field, magnetic induction intensity, radio interference field strength and audible noise at the factory boundary generated by the p...

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Application Information

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IPC IPC(8): G01R29/26
Inventor 张霞莫娟孙宇晗曹枚根杨臻张雪松
Owner STATE GRID CORP OF CHINA
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