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Overvoltage sensor of overhead transmission line

A technology for overhead transmission lines and voltage sensors, which is applied in the direction of measuring current/voltage, voltage dividers, instruments, etc., can solve problems such as inability to reflect the overvoltage characteristics of overhead transmission lines, large differences in amplitude and waveform, and poor operating conditions. Achieve the effect of light weight, stable partial pressure ratio and easy installation

Inactive Publication Date: 2009-11-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that because the amplitude and waveform of the overvoltage wave on the substation bus and the overvoltage wave on the overhead transmission line are quite different, the overvoltage waveform and parameters of the substation cannot be used to reflect the overvoltage of the overhead transmission line characteristic
[0005] The overhead transmission line is located in the wild, the environment is harsh, the situation is complicated, and the operating conditions are worse than those of the substation. The existing overvoltage sensor is not suitable for sampling the overvoltage signal of the overhead transmission line

Method used

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  • Overvoltage sensor of overhead transmission line

Examples

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Embodiment 1

[0030] Such as Figure 1~3 Shown: a 110kV overhead transmission line overvoltage sensor, composed of a voltage monitoring unit and a data acquisition unit. The characteristics are: its voltage monitoring unit includes overhead transmission line 1, shielding shell 2, induction metal plate 3, insulating support 4, voltage dividing capacitor 7, matching resistor 8, front-end protection circuit board 9, stainless steel shielding box 6, coaxial cable 11 . The shielding case 2 is set under the overhead transmission line 1, and is fixed on the tower by bolts 5 and nuts. The distance between the shielding case 2 and the overhead power transmission line 1 is 3000 mm. The material of the shielding case 2 is stainless steel plate, and its thickness The shape of the shielding shell 2 is a cuboid shell with an open upper end, the length of the cuboid shell is 220 mm, the width is 70 mm, and the height is 50 mm. The upper end of the shielding shell 2 is fixed by bolts 5 and nuts. There ar...

Embodiment 2

[0032] A 110kV overhead transmission line overvoltage sensor, the same as embodiment 1, characterized in that: the distance between the shielding case 2 and the overhead transmission line 1 is 8000 mm, the material of the shielding case 2 is an aluminum alloy plate with a thickness of 2.5 mm, the shielding The shape of the shell 2 is a cuboid shell with an open upper end. The length of the cuboid shell is 1520mm, the width is 820mm, and the height is 80mm. The induction metal plate 3 is a rectangle with a thickness of 2.5 mm, and its material is an aluminum alloy plate with a length of 1500 mm and a width of 800 mm.

Embodiment 3

[0034] A 110kV overhead transmission line overvoltage sensor, the same as embodiment 1, characterized in that: the distance between the shielding case 2 and the overhead transmission line 1 is 15000mm, the material of the shielding case 2 is iron plate, and its thickness is 5mm, the shielding case 2 The shape is a cuboid shell with an open upper end. The length of the cuboid shell is 3020mm, the width is 2020mm, and the height is 100mm. The induction metal plate 3 is a rectangle with a thickness of 5 mm, and its material is an iron plate with a length of 3000 mm and a width of 2000 mm.

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Abstract

The invention relates to an overvoltage sensor of overhead transmission lines, relating to an overvoltage monitoring device of the overhead transmission line of an AC power system. The sensor consists of a voltage monitoring unit and a data acquisition unit, and is characterized in that the voltage monitoring unit mainly comprises an overhead transmission line, a sensing metal plate, a screening shell, a stainless steel screening box, a voltage-dividing capacitor, a front end protection circuit, a matched resistance, a coaxial-cable and the like. The sensor has the effects of simple structure, small volume, light weight, convenient installation, low cost, high safety, good universality, high linearity and high accuracy on testing overvoltage and the like. The invention can be widely used as the voltage sensor of the overhead transmission line, especially be applicable to overvoltage sensor of 10kV to 1000kV overhead transmission lines.

Description

1. Technical field [0001] The invention belongs to the technical field of overvoltage monitoring in electric power systems, and in particular relates to an overvoltage monitoring device for overhead transmission lines in AC power systems. 2. Background technology [0002] With the development of the national economy, the voltage level and scale of the power system develop and expand rapidly. The overhead transmission lines of the power system are distributed in a vast area, crossing mountains, crossing rivers, criss-crossing, and stretching for thousands of kilometers. They are easily attacked by lightning overvoltage. , Lightning overvoltage includes two forms: induced lightning overvoltage and direct lightning overvoltage. Once the overhead transmission line is attacked by lightning overvoltage, it is easy to cause a flashover of the overhead transmission line to the ground (lightning wire or tower), and then the power frequency voltage will continue to discharge through t...

Claims

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Application Information

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IPC IPC(8): G01R19/165G01R15/04
Inventor 杜林司马文霞王有元陈伟根杨庆廖瑞金李剑常阿飞戴斌
Owner CHONGQING UNIV
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