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Magnetic field aggregation component and non-contact leakage current measurement device and method

A technology of magnetic field gathering and measuring device, applied in measuring device, measuring electrical variable, magnitude/direction of magnetic field, etc., can solve the problems of complicated signal processing steps, high production cost, poor measurement accuracy, etc.

Inactive Publication Date: 2020-01-10
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional non-contact measurement system is mainly aimed at strong measurement signals. When it is applied to the measurement of the ground leakage current of power equipment with an effective value of only a few milliamperes to hundreds of milliamperes, the measurement signal is often weak due to the measurement The accuracy is poor, and in order to improve the measurement accuracy, multiple high-precision signal processing circuits are usually added to the signal processing circuit board, the signal processing steps are complicated, and the production cost is high

Method used

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  • Magnetic field aggregation component and non-contact leakage current measurement device and method
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  • Magnetic field aggregation component and non-contact leakage current measurement device and method

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Embodiment 1

[0083] like figure 2 As shown in the magnetic field concentrator, its magnetic field concentrator includes a first magnetic field concentrator 1, and a second magnetic field concentrator 2 located above the first magnetic field concentrator 1, on the first magnetic field concentrator 1 and the second magnetic field concentrator 2 Each is provided with two longitudinal air gaps 3, and the two longitudinal air gaps 3 are arranged symmetrically about the central axis of the magnetic field concentrator, and a transverse air gap 4 is arranged between the first magnetic field concentrator 1 and the second magnetic field concentrator 2; the first The longitudinal air gap 3 of the magnetic field concentrator 1 is aligned with the longitudinal air gap 3 of the second magnetic field concentrator 2 .

[0084] like figure 1 and figure 2As shown, at this time, the first magnetic field sensor 5 and the second magnetic field sensor 6 are respectively located between the longitudinal air ...

Embodiment 2

[0093] like image 3 As shown, another magnetic field concentrator of the present invention includes a first magnetic field concentrator 1, and a second magnetic field concentrator 2 located outside the first magnetic field concentrator 1, the first magnetic field concentrator 1, the second magnetic field concentrator Two longitudinal air gaps 3 are respectively arranged on the device 2, and the two longitudinal air gaps 3 are arranged symmetrically with respect to the central axis of the magnetic field concentrator, and a horizontal air gap is arranged between the first magnetic field concentrator 1 and the second magnetic field concentrator 2. Gap 4.

[0094] In some embodiments, the width of the transverse air gap 4 is not greater than 5 mm, and the width of the longitudinal air gap 3 is not greater than 1 mm.

[0095] In some embodiments, the measuring direction of the magnetic field sensor is placed parallel to the direction of the measured magnetic field to further incr...

Embodiment 3

[0098] A non-contact leakage current measuring device, comprising a housing 8, a first magnetic field concentrator 1, a first magnetic sensor 5, a second magnetic sensor 6 and a signal processing circuit are arranged in the housing 8, and a signal processing circuit is also arranged in the housing 8 A second magnetic field concentrator 2 and a partition 9 are provided, and the partition 9 is used to separate the first magnetic field concentrator 1 and the second magnetic field concentrator 2, and the first magnetic field concentrator 1 and the second magnetic field concentrator 2 Concentric arrangement, the first magnetic field concentrator 1 and the second magnetic field concentrator 2 are respectively provided with two longitudinal air gaps 3, and a transverse air gap 4 is arranged between the first magnetic field concentrator 1 and the second magnetic field concentrator 2, so The first magnetic sensor 5, the second magnetic sensor 6 and the signal processing circuit are loca...

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Abstract

The invention discloses a magnetic field aggregation component and a non-contact leakage current measurement device and method. The magnetic field aggregation component comprises at least two concentrically arranged magnetic field concentrators, wherein longitudinal air gaps are arranged in the magnetic field concentrators, a transverse air gap is arranged between two adjacent magnetic field concentrators, and a magnetic sensor is placed in the transverse air gap. The magnetic field aggregation component of the invention adopts four air gap structures, so that the widths of the longitudinal air gaps of the magnetic field concentrators are no longer limited by the size of the magnetic field sensor; the magnetic field strength of the edges of the longitudinal air gaps is remarkably improvedthrough the minimum widths of the longitudinal air gaps; and two superimposed edge magnetic fields are simultaneously measured by the magnetic sensor located in the transverse gap, the measured magnetic field strength is much larger than the magnetic field strength of a traditional single air gap structure, a signal-to-noise ratio is improved and then the leakage current with only a few milliampsto hundreds of milliamps can be measured, and the requirement for the precision of earth leakage current measurement of power equipment is met.

Description

technical field [0001] The invention relates to the field of electric equipment leakage current measurement to the ground, in particular to a magnetic field gathering component, a non-contact leakage current measurement device and a measurement method. Background technique [0002] Intelligent and automated operation and maintenance of power equipment has always been the development direction of power grid technology. At present, big data and Internet of Things technology has made great progress, which greatly expands the application scope and field of online monitoring technology for power equipment. Insulation performance is related to the safe and reliable operation of power equipment, and has always been the focus of on-line monitoring technology. In particular, the monitoring of multiple insulation performance-related index parameters such as insulation resistance and relative dielectric loss value requires the measurement of the ground leakage current of power equipmen...

Claims

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Application Information

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IPC IPC(8): G01R15/14G01R19/00G01R31/50G01R33/02
CPCG01R15/148G01R19/0092G01R33/02
Inventor 罗睿希李福超刘鹍艾兵张翔黄嘉鹏
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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