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Lightning current online monitoring system of overhead transmission line based on differential ring

A technology for overhead transmission lines and monitoring systems, applied in the direction of measurement and shielding devices using digital measurement technology, to achieve high integration, reduce economic losses, and facilitate popularization and application

Inactive Publication Date: 2012-10-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lightning current online monitoring system for overhead transmission lines based on a differential ring in view of the shortcomings of the existing lightning current online monitoring system for overhead transmission lines

Method used

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  • Lightning current online monitoring system of overhead transmission line based on differential ring
  • Lightning current online monitoring system of overhead transmission line based on differential ring
  • Lightning current online monitoring system of overhead transmission line based on differential ring

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 As shown in ~ 5, an online lightning current monitoring system for 110kV overhead transmission lines based on differential rings mainly includes a current sensor 1, a lightning signal acquisition unit 2, a data receiving and GPRS transmission unit 8, a power supply unit 7, and a user unit 12. Its characteristics are:

[0030] The current sensor 1 is installed on the cross arm of the overhead transmission line pole and tower and is perpendicular to the three-phase conductor at 1.4m. The current sensor 1 is a differential loop current sensor, including a lead wire 13 , a junction box 14 , a shielded outer shell 15 , a shielded inner shell 17 , a differential loop coil 16 , an integrating resistor 18 , a coaxial cable connector 19 , and a coaxial cable 20 . The shielding inner shell 17, the shielding outer shell 15 and the junction box 14 are all made of aluminum. The shape of the shielding inner shell 17 is a hollow cylindrical shell with outer flange...

Embodiment 2

[0037] A differential ring-based lightning current online monitoring system for overhead transmission lines for 220kV, the same as in Embodiment 1, wherein:

[0038] The current sensor 1 is installed on the cross-arm of the overhead transmission line pole and is perpendicular to the three-phase conductor 2m; the number of turns of the differential ring coil 16 is 90 turns; at the lower end of the other side of the shielding shell 15 A circular through hole (i.e. lead hole) with a radius of 6mm is provided; the length of the junction box 14 is 25mm; Inside the junction box 14; the sensitivity of the current sensor 1 is 0.04V / kA, the frequency band is 575Hz-25MHz, the monitoring range of the lightning current amplitude is 1.25kA-100kA, and the number of high-speed sampling channels is 4.

Embodiment 3

[0040] A differential loop-based lightning current online monitoring system for overhead transmission lines for 500kV is the same as in Embodiment 1, wherein:

[0041] The current sensor 1 is installed on the cross arm of the overhead transmission line pole and tower and is perpendicular to the three-phase conductor at 5m; the hollow cylindrical shell of the shielding inner shell 17 has a wall thickness of 10mm, a height of 200mm, and a hollow inner diameter of is 200mm; the width of the outer flange of the upper end of the shielding inner shell 17 is 10mm, and the thickness is 10mm; the width of the outer flange of the bottom end of the shielding inner shell 17 is 10mm, and the thickness is 14mm; the differential ring coil 16 Copper core enameled wire with a wire diameter of 1.5mm is evenly wound on the outer surface of the shielding inner shell 17, the number of turns of the differential ring coil 16 is 400 turns, and the inner diameter is 205mm; the shielding shell 15 The w...

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Abstract

The invention provides a lightning current online monitoring system of an overhead transmission line based on a differential ring, relating to a structure of the lightning current online monitoring system of the overhead transmission line. The lightning current online monitoring system mainly comprises a current sensor, a lightning stroke signal collecting unit, a data receiving and GPRS (General Packet Radio Service) transmission unit, a power supply unit and a user unit. With the adoption of the lightning current online monitoring system provided by the invention, lightning current of the overhead transmission line is monitored online in a non-contact manner. The lightning current online monitoring system has the advantages of being safe to use, reliable in work, intelligent in operation, high in monitoring accuracy, high in sensitivity and high in precision, can help staff to rapidly troubleshoot a lightning fault of the overhead transmission line to reduce loss, and has the characteristics of simple circuit structure, low cost and convenience in popularization and application and the like. The lightning current online monitoring system provided by the invention can be widely applied to the lightning current online monitoring system of the overhead transmission line, and is particularly suitable for the lightning current online monitoring system of the 110-500 kV high-voltage overhead transmission line.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of electrical equipment in electric power systems, and in particular relates to the structure of an on-line lightning current monitoring system for overhead transmission lines. Background technique [0002] Overhead transmission lines cover a wide area and are erected in the air, so they are extremely vulnerable to lightning strikes and cause power outages. In order to reduce lightning accidents and improve the reliability of power system power supply, effective lightning protection measures must be taken. Lightning current parameters play a very important role in lightning protection of overhead transmission lines. Accurate lightning current parameters are not only the basis for lightning protection design of power systems, but also the prerequisite for studying lightning characteristics and analyzing lightning accidents. At present, the values ​​of lightning current parameters in my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R1/18
Inventor 姚陈果龙羿米彦李成祥陈锐王琪吴昊
Owner CHONGQING UNIV
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