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Method for screening magnetic field generated by electrical power transmission line and electrical power transmission line so screened

A technology for power transmission lines, cables, used in the installation of cables, cable installation in ground conduits, electrical components, etc.

Inactive Publication Date: 2005-10-19
PRYSMIAN CAVI E SISTEMI ENERGIA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The applicant has solved the problem of improving the magnetic shielding properties of the two-piece duct, as stated above, a solution regarding the installation

Method used

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  • Method for screening magnetic field generated by electrical power transmission line and electrical power transmission line so screened
  • Method for screening magnetic field generated by electrical power transmission line and electrical power transmission line so screened
  • Method for screening magnetic field generated by electrical power transmission line and electrical power transmission line so screened

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0084] The applicant has measured the magnetic field generated above the ground by the buried power lines described above under several different operating conditions.

[0085] The test circuit consisted of a current generator, 3 cables 3 in trefoil configuration connected to said generator, a 50 meter long cylindrical steel pipe containing cables 3 from the outlet of said generator, and 6 longitudinal sections 4 of the cables at the ends of the cylindrical duct. At the outlets of the 6 sections 4 the cables 3 are short-circuited. The longitudinal sections 4 are overlapped by 200mm below ground and spaced 1.4 meters apart. A magnetometer model PLM-100WB Handheld ELF manufactured by MACINTYRE ELECTRONIC DESIGNASSOCIATES, INC. (485 Spring Park Place, Herndon, VA 20170) was used 1 meter above the ground between the third and fourth sections (i.e., in the middle of the transmission line ) to measure the magnetic field.

[0086] The dimensions of the bottom member 5 are as follo...

example 2

[0106] The applicant has also determined the change of the magnetic field 1 meter above the ground when the measurement position is changed along the transverse direction (ie the direction perpendicular to the pipeline). The shape, size and material of the pipe 2 are the same as in Example 1, and the following connection conditions are considered:

[0107] a) no connection between the bottom 5 and the cover 6, and a good insulation between them is obtained by means of inserting a nylon plate in between;

[0108] b) connected by clips 7 every 50cm;

[0109] c) connected by clips 7 every 25cm;

[0110] Image 6 represents the result of this experiment. It can be seen that the curve is bell-shaped and is maximum at the point of zero abscissa, that is, the maximum in the mid-plane of the pipe 2 . It can also be seen that the percentage improvement achievable by using the clip 7 is substantially constant by virtue of leaving the wire 1 .

example 3

[0112] The Applicant has also carried out a new set of measurements in order to compare the shielding effectiveness of different solutions by means of "ad hoc" parameters. This parameter, referred to herein as "electrical continuity", is denoted by the symbol λ:

[0113] λ = 100 B n - B i B n

[0114] where B n is the maximum magnetic field measured 1 meter above the ground between the bottom 5 and the cover 6 under the condition of complete electrical insulation by inserting a nylon plate (for example, using the same instrument as in Example 1), B i is the maximum magnetic field measured at 1 meter above the ground under specified operating conditions. The parameter λ is independent of the measurement distance, so it is an absolute indicator of the increase i...

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PUM

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Abstract

An electrical power transmission line, comprises at least one electrical cable, a conduit of ferromagnetic material enclosing the electrical cable and comprising a base and a cover, and electrical contact elements for electrically connecting the base and the cover, wherein the electrical contact elements are selected from the group consisting of metal fusion joints and metal resilient members suitable to pierce the ferromagnetic materials, so that an electromagnetic continuity between base and cover can be provided for improving the magnetic shileding properties of the conduit.

Description

technical field [0001] The invention relates to a method for shielding a magnetic field generated by a power transmission line and a power transmission line so shielded. Background technique [0002] Generally speaking, high power power transmission lines are designed to operate at medium voltage (typically 10-60kV) and high voltage (typically higher than 60kV) and currents on the order of hundreds of amperes (typically 500-2000A). The power transmitted in these lines can reach the order of hundreds of typical 400MVA. Generally speaking, the transmitted current is low frequency alternating current, in other words generally below 400 Hz, typically 50-60 Hz. Generally speaking, these lines are used to transmit power from the power station to the city center over a distance of the order of tens of kilometers (typically 10-100km). [0003] Generally speaking, a power transmission line is a three-phase line, which includes 3 cables buried in a 1-1.5m deep cable trench. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G9/04
CPCH02G9/04H02G9/065H02G9/02
Inventor 法布里奇奥·多纳兹昂里克·博尔吉保罗·麦奥里赛尔吉奥·斯普瑞菲科
Owner PRYSMIAN CAVI E SISTEMI ENERGIA
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