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Method for obtaining acoustic noise from corona current data

A technology of corona current and noise, applied in the direction of testing dielectric strength, etc., can solve the problems of environmental factor errors, waste of manpower and material resources, etc.

Active Publication Date: 2017-01-11
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, until now, corona current and audible noise have been obtained by measuring them separately or using empirical formulas to predict them separately. Measuring them separately is a waste of manpower and material resources, and the prediction by empirical formulas will be due to environmental factors. produce a large error

Method used

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  • Method for obtaining acoustic noise from corona current data
  • Method for obtaining acoustic noise from corona current data
  • Method for obtaining acoustic noise from corona current data

Examples

Experimental program
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Embodiment 1

[0059] The steps of the method are as figure 1 shown, including:

[0060] Step A: time domain data of corona current is measured;

[0061] This embodiment is carried out in a large outdoor corona cage located at the UHV test base in Changping, Beijing, China. The size of the single cage of the corona cage is 10m×10m, the length is 70m, and the total width of the double cage is 20.5m. Carried out in the present embodiment is unipolar (positive polarity) experiment, and the wire that adopts is the JL / G1A-720 / 50-45 / 7 type wire of 6 splits, and the split distance is 0.45m, hangs in corona cage positive center. Corona currents were measured at voltage levels of 0KV, 450kV, 500kV, 600kV, 700kV, 800kV, 900kV and 1100kV.

[0062] The corona current signal can be measured by any corona current sensor suitable for UHV electromagnetic environment, and its sampling frequency is required to be ≥40kHz, the lower boundary of the measurement bandwidth is 0kHz, and the upper boundary is ≥2...

Embodiment 2

[0095] This embodiment was carried out in May 2012 in the double-circuit UHV DC test line section of the UHV test base located in Changping, Beijing, China. The experimental line section is 1080m long, and its positive and negative poles can realize voltage regulation in the range of 0 to 1200kV and 0 to -1200kV respectively. The experiment is a bipolar experiment, and the wire used is still the 6-split JL / G1A-720 / 50-45 / 7 wire, and the wire splitting distance is 0.45m. In this embodiment, a total of 10 groups of experiments were carried out, and corona current data under different experimental conditions were respectively obtained. The corona current measuring device used was the same as the previous embodiment, and the specific experimental conditions are shown in Table 2.

[0096] Table 2 Experimental conditions of ten groups of experiments on UHV actual transmission lines

[0097]

[0098] Figure 7 It is a comparative relationship diagram between the audible noise A s...

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Abstract

The invention provides a method for obtaining the acoustic noise from corona current data, and the method comprises the steps: A, measuring time domain data of a corona current; B, filtering an interference signal in the time domain data of the corona current; C, obtaining the discrete frequency spectrum of the corona current after the interference signal is filtered; D, solving the logarithmic power spectrum of the corona current; E, obtaining the mean logarithmic power spectrum density of the corona current within the high-frequency band of the acoustic noise; F, solving the acoustic noise below a line based on the mean logarithmic power spectrum density of the corona current. The method provided by the invention obtains the acoustic noise through the corona current of a power transmission line, can enable the measurement of the corona current and the measurement of acoustic noise to be integrated, and greatly simplifies a working process of corona current measurement and acoustic noise measurement in a conventional method.

Description

technical field [0001] The invention relates to a method for obtaining audible noise in the technical field of UHV transmission, and more particularly relates to a method for obtaining audible noise from corona current data of a high-voltage direct current transmission line. Background technique [0002] In order to meet the demand for electricity for sustainable economic and social development, the construction of a strengthened power grid centered on high-voltage and ultra-high voltage power grids has become a strategic goal of power construction. When long-distance and large-capacity transmission is adopted, UHV transmission can effectively save line corridors, help improve network structure, transmission bottlenecks, and realize optimal allocation of resources on a large scale. The economic and social benefits are very obvious. [0003] The electromagnetic environment of UHVDC transmission lines is a major technical issue that must be considered in the design, constructi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 刘元庆刘颖异陆家榆张喜润王秋生周丽娟邓义茂袁海文林珊珊
Owner CHINA ELECTRIC POWER RES INST
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