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Current sensor for polluted insulator leakage of AC high-voltage electric transmission line

A high-voltage transmission line, leakage current technology, applied in the direction of measuring current/voltage, parts and instruments of electrical measuring instruments, etc. The problems of inconvenient loading and unloading of the annular iron core can achieve the effect of good linearity, high mechanical strength, convenient loading and unloading and operation.

Active Publication Date: 2010-02-17
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this sensor is: the sensor is a core-through closed-loop current sensor, and the ring iron core is extremely inconvenient when loading and unloading on site, especially for lines that have been put into operation, the line must be shut down before loading and unloading, and then the insulator strings must be removed , and then the sensor can be loaded and unloaded on the line, which is very inconvenient, labor-intensive and time-consuming
This greatly increases the input of manpower and financial resources in the power sector, which cannot meet the requirements of power system safety and economy.

Method used

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  • Current sensor for polluted insulator leakage of AC high-voltage electric transmission line
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  • Current sensor for polluted insulator leakage of AC high-voltage electric transmission line

Examples

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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, an AC high-voltage transmission line dirty insulator leakage current sensor mainly includes a Rogowski coil with an iron core, a shielding shell, and a coaxial cable connector 13 . The Rogowski coil is composed of an iron core 9 and a winding 1. The characteristics are: the iron core 9 is two semicircular annular iron cores, the material of the two semicircular annular iron cores 9 is ferrite, and the inner diameter of each semicircular annular iron core 9 is 44mm. , Outer diameter is 67mm, thickness is 19mm. Two semi-circular iron cores 9 are combined into one annular iron core 9. The winding 1 is divided into two windings: a copper enameled wire with a diameter of 0.65 mm is tightly wound on the upper semi-circular iron core 9 to form a winding with 65 turns, and at the outlets of the winding 1 at both ends of the iron core 9, respectively A copper pin 3 is welded with a copper enameled wire head; a copper enameled wire with a diameter of ...

Embodiment 2

[0037] An AC high-voltage transmission line dirty insulator leakage current sensor, the same as embodiment 1, wherein: the inner diameter of the two semicircular annular iron cores 9 is 43mm, the outer diameter is 66mm, and the thickness is 18mm. The diameter of the winding 1 enameled wire is 0.6mm; the copper shielding shell The inner diameter of the hollow groove is 33mm, the outer diameter is 98mm, and the height is 28mm. The thickness of the inner wall 8 of the hollow groove is 4mm, and the thickness of the outer wall 7 is 10mm; the inner diameter of the upper cover of the copper shielding shell is 33mm, the outer diameter is 98mm, and the thickness is 4mm. ; On the inner wall 8 of the hollow groove of the copper shielding shell, a gap of 1.2mm is opened; the thickness of the outermost epoxy resin layer 6 of the copper shielding shell is 5mm; The value range is 0.5mA~500mA, the frequency range is 10Hz~30kHz, and the sensitivity is about 59.4mV / mA.

Embodiment 3

[0039] An AC high-voltage transmission line dirty insulator leakage current sensor, the same as embodiment 1, wherein: the inner diameter of the two semicircular annular iron cores 9 is 42mm, the outer diameter is 65mm, and the thickness is 17mm; the diameter of the enameled wire of the winding 1 is 0.5mm; the copper shield The inner diameter of the hollow groove of the shell is 30mm, the outer diameter is 95mm, and the height is 26mm. The thickness of the inner wall 8 of the hollow groove is 3mm, and the thickness of the outer wall 7 is 8mm; the inner diameter of the upper cover of the copper shielding shell is 30mm, the outer diameter is 95mm, the thickness 3mm; on the inner wall 8 of the hollow groove of the copper shielding shell, a gap with a width of 1.0mm is opened; the thickness of the outermost epoxy resin layer 6 of the copper shielding shell is 4mm; the winding number of one turn of the leakage current sensor is 150 turns, The detection current amplitude range is 0.5...

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Abstract

The invention relates to a current sensor for the polluted insulator leakage of an AC high-voltage electric transmission line, in particular to a current sensor for monitoring pollution flashover of an electric transmission line. The current sensor mainly comprises a Rogowski coil with an iron core, a copper shielding shell and a coaxial cable joint and is characterized in that the iron core of the Rogowski coil is in a two semi-circle ring shape and is provided with two windings; and the shielding shell consists of a hollow groove in the two semi-circle ring shape and an upper cover in the two semi-circle ring shape. The invention has the advantages of simple assembling and disassembling process, very convenient field assembly and disassembly, high leakage current measuring precision, wide frequency band, good linearity, safe and reliable operation, and the like, thereby being widely used for newly-established and operated high-voltage electric transmission lines.

Description

technical field [0001] The invention belongs to the technical field of online monitoring of pollution flashover of electrical equipment, and in particular relates to a leakage current sensor for monitoring pollution flashover of power transmission lines. Background technique [0002] Pollution flashover is one of the catastrophic accidents that endanger the safety of power system transmission lines. In recent years, my country's pollution flashover accidents have occurred continuously, causing great losses to the national economy. Since the leakage current is closely related to the pollution flashover process, it is of great significance to study the leakage current to grasp the pollution flashover mechanism and carry out pollution flashover warning, and the leakage current measurement device is the main means to study the leakage current. [0003] Leakage current sensors can be divided into electrical contact current sensors and non-electrical contact current sensors in te...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R19/00G01R15/00G01R1/02G01R1/04
Inventor 姚陈果毛峰杜林胡建林唐炬米彦李成祥蒋兴良孙才新
Owner CHONGQING UNIV
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