Light-emitting diode-based insulator leakage current fiber sensor system

A technology of light-emitting diodes and optical fiber sensors, applied in voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problems of monitoring instruments with very high precision requirements, being easily affected by surrounding magnetic fields, and poor electromagnetic anti-interference ability. , to achieve the effect of easy on-site installation and disassembly, avoiding the process of electromagnetic conversion, and improving sensitivity and accuracy

Active Publication Date: 2012-06-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the current sensor system are: poor frequency response, extremely poor electromagnetic anti-interference ability, extremely susceptible to the influence of the surrounding magnetic field, and the phase change is relatively subtle and difficult to distinguish, and the precision requirements for monitoring instruments are very high. The monitoring accuracy is not high

Method used

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  • Light-emitting diode-based insulator leakage current fiber sensor system
  • Light-emitting diode-based insulator leakage current fiber sensor system
  • Light-emitting diode-based insulator leakage current fiber sensor system

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Experimental program
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Effect test

Embodiment 1

[0045] Such as Figure 1~4 As shown, a light-emitting diode-based insulator leakage current optical fiber sensor system mainly includes a fixed bracket, a sensor probe 1, an optical fiber 2, a photoelectric converter 4, a signal modulator 6, a data acquisition card 7, and a computer 8. The fixed support is an open clamp-shaped support composed of two open rings 9 and a probe support. The two open rings 9 are made of brass, and each open ring 9 is formed by two half rings interlocking. The inner diameter of each open ring 9 is 80 mm, the outer diameter is 90 mm, and the thickness is 10 mm. The two open rings 9 are respectively clamped on the steel caps of the adjacent insulators of the tested insulator string 23 on the overhead line tower 22. to monitor the leakage current flowing through the insulator string 23. Screw holes are respectively provided at the opening and the middle of the semi-circle of each split ring 9, and the split ring 9 is fixedly connected to the steel c...

Embodiment 2

[0053] A kind of insulator leakage current optical fiber sensor system based on light-emitting diode, with embodiment 1, wherein: the inner diameter of two open rings 9 is 82mm, the outer diameter is 92mm, the thickness of ring is 13mm; The cross arm 10 length of probe holder is 290mm, the length of the longitudinal arm 11 is 147mm, the length of the rectangular section of the hollow transverse arm 10 and the longitudinal arm 11 is 26mm, and the width is 20mm; the diameter of the hollow channel 19 in the hollow transverse arm 10 and the longitudinal arm 11 is 5.5mm; the sensor probe 1 The housing of the housing is 33mm long, 26mm wide, 22mm high, and has a wall thickness of 1.5mm, and the epoxy resin coating thickness of the outer shell is 0.1mm; the housing of the photoelectric converter 4 has a length of 39mm, a width of 25mm, and a height of 21mm , The wall thickness is 1.5mm. The sensitivity to detect leakage current is 39.8mV / mA.

Embodiment 3

[0055] A kind of insulator leakage current optical fiber sensor system based on light-emitting diode, with embodiment 1, wherein: the inner diameter of two open rings 9 is 76mm, and outer diameter is 86mm, and the thickness of ring is 15mm; The cross arm 10 length of probe holder is 280mm, the length of the longitudinal arm 11 is 152mm, the length of the rectangular section of the hollow transverse arm 10 and the longitudinal arm 11 is 24mm, and the width is 22mm; the diameter of the hollow channel 19 in the hollow transverse arm 10 and the longitudinal arm 11 is 6.5mm; the sensor probe 1 The housing of the housing is 32mm long, 24mm wide, 24mm high, and has a wall thickness of 2.5mm. The thickness of the epoxy resin coating on the outer shell is 1mm; the housing of the photoelectric converter 4 has a length of 40mm, a width of 24mm, and a height of 20mm. The thickness is 2.5mm. The sensitivity to detect leakage current is 40.2mV / mA.

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Abstract

The invention discloses a light-emitting diode-based (LED-based) insulator leakage current fiber sensor system, and belongs to the technical field of flash pollution online monitoring of electric equipment. The system comprises a fixed bracket, a sensor probe, a fiber, a photoelectric converter, a signal modulator, a data acquisition card, a computer and the like. The system is characterized in that: the sensor probe transmits light signals by using leakage current as luminous drive of an LED, then the light signals are transmitted to the photoelectric converter through the fiber and converted into electrical signals, and the electrical signals are transmitted to the computer for analysis through the signal modulator and the data acquisition card in turn. The system can selectively monitor different half waves of leakage current independently in real time, has the characteristics of strong anti-interference capability, high sensitivity, high precision of measured leakage current and good safety, and is convenient to assemble and disassemble and convenient for popularization and application. The system can be widely applied to high-voltage alternating current power transmission lines of transformer substations and overhead power transmission lines which are newly built and put into operation.

Description

technical field [0001] The invention belongs to the technical field of online pollution flashover monitoring of electrical equipment, and in particular relates to an optical fiber leakage current sensor device for on-line monitoring of the leakage current of insulator strings in substations and overhead transmission lines and pollution flashover. Background technique [0002] For a long time, pollution flashover accidents of insulator strings have been one of the disasters that endanger the safety of power system transmission lines. The main measure to prevent pollution flashover of insulator strings is to monitor the leakage current on the insulator strings of transmission lines. According to the close relationship between the leakage current of the insulator strings and the pollution flashover process, further grasp the mechanism of pollution flashover, which is extremely important for the early warning of pollution flashover. important practical significance. The wide ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/22G01R31/12G01R15/24G01R19/00
Inventor 姚陈果王建李成祥米彦杜林胡建林蒋兴良孙才新
Owner CHONGQING UNIV
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