Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for reducing passive interference of high-tension transmission line in low frequency band

A technology of high-voltage transmission lines and transmission lines, which is applied to the installation of cables, overhead lines/cable equipment, electrical components, etc. The effect of source interference

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +1
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of protection distance has a large safety margin, and it is usually difficult to meet the requirements of protection distance in areas where land resources are scarce

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for reducing passive interference of high-tension transmission line in low frequency band
  • Method for reducing passive interference of high-tension transmission line in low frequency band
  • Method for reducing passive interference of high-tension transmission line in low frequency band

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] Figure 11 The layout of the medium wave transmitting station and two adjacent lines is given. Table 1 gives the tower number of the adjacent transmission line, the coordinates of the tower relative to the medium-wave transmitting station, and the height of the tower. According to these two quantities, the span between any two towers and the closing distance formed by each two towers can be calculated. The resonant frequency of the "loop antenna". The operating frequency of the transmitting station is 680kHz (a wavelength of 441m), and the general line length is between 400m and 500m, so resonance is likely to occur at this operating frequency.

[0068] The sum of tower height and span determines which spans may resonate at the operating frequency of the transmitting station. Since there is no sudden change in the resonance area, the resonance bandwidth cannot be accurately calculated. Based on the rule of thumb, ±60kHz is generally used as the resonance bandwidth. Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of electromagnetic compatibility of high-tension transmission and transformation engineering, and specifically relates to a method for reducing passive interference of a high-tension transmission line in a low frequency band. The method focuses on analyzing the resonant frequency of a high-tension overhead line, through changing the grounding mode of the power transmission line, reduces induction currents of the high-tension overhead transmission line in the working frequency band of a radio station, and reduces the passive interference generated by the power transmission line from a source. The method comprises the following steps: (1), determining the resonant frequency of an annular antenna composed of a power transmission line tower and an overhead ground wire; (2), according to the actual arrangement of the power transmission line, determining resonant frequencies of different spans; and (3), according to radio interference frequencies needing to be avoided, detuning the high-tension transmission line through a mode of changing grounding points. According to the invention, through comparing test data obtained through tests, it is proved that the method is quite high in accuracy and can be applied to reduction of the passive interference exerted on an adjacent medium-short wave radio station by the high-tension transmission line in the future.

Description

technical field [0001] The invention relates to the field of electromagnetic compatibility of high-voltage power transmission and transformation projects, in particular to a method for reducing passive interference of high-voltage power transmission lines in low-frequency bands. Background technique [0002] The passive interference formed by the high-voltage overhead transmission line to the radio station mainly comes from the induced current generated by the high-voltage overhead wire and the iron tower excited by the electromagnetic field of the radio signal. Frequency interference will change the amplitude and phase of the original radio signal. [0003] At present, there is no relevant research at home and abroad on the method of reducing passive interference of transmission lines. At present, the solution to the passive interference of high-voltage transmission lines is to adopt the method of protective distance, by widening the distance between the high-voltage trans...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/00
CPCH02G1/02
Inventor 干喆渊邬雄张建功李妮倪园周兵陈豫朝张斌
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com