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Anti-interference coal mine electromechanical equipment start-stop detection method

A technology of electromechanical equipment and detection methods, applied in the direction of measuring devices, measuring magnetic variables, instruments, etc., can solve the problems of increasing the volume and weight of sensors, narrow linear range, and poor linearity, so as to reduce the workload of on-site installation and debugging, Ensure stability and reliability, improve the effect of anti-interference ability

Pending Publication Date: 2021-03-09
TIANDI CHANGZHOU AUTOMATION +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Magnetic sensors with Hall elements as sensitive elements usually use a magnetic gathering ring structure to amplify the magnetic field and increase the output sensitivity of the Hall, thereby increasing the volume and weight of the sensor. At the same time, the Hall element has the defects of large power consumption and poor linearity
The sensitivity of the AMR element is much higher than that of the Hall element, but its linear range is narrow
Magnetic sensors with GMR elements as sensitive elements have higher sensitivity than Hall current sensors, but their resolution is lower
TMR has higher sensitivity, wider linear range, but more expensive
[0004] In addition, the underground cables of coal mines are complex and have great interference, and the start-stop sensor is susceptible to external interference and occasional misjudgment, which seriously affects the safe production and maintenance costs of underground coal mines.

Method used

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  • Anti-interference coal mine electromechanical equipment start-stop detection method
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Embodiment Construction

[0029] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0030] Generally, three-core cables are mostly used in cable transmission and distribution projects of three-phase power systems below 35kV. Such as figure 1 As shown, two magnetoresistive chips are installed on the S of the cable 1 and S 2 Department, S 1 and S 2 The included angle is 120°, S 1 and S 2 The radius to the center of the cable is R, where the center of the cable is O, A, B, and C are the positions of the core wires of the cable, and the distances from the center of the cable to the core wires of A, B, and C are r 1 、r 2 and r 3 , it can be set that the y-axis coincides with OA, then the coordinates of point A are (0, r 1 ),...

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Abstract

The invention relates to an anti-interference coal mine electromechanical equipment start-stop detection method, which comprises the following steps of installing two or more magnetoresistance chips outside a cable, and calculating a magnetic field value of any point of the cable according to parameters R and r of the cable, current IA, IB and IC values of the cable and an installation angle of the magnetoresistance chip, and determining the relationship between the magnetic field value and the current of the cable through the magnetic field vector sum of each magnetoresistance chip. Accordingto the anti-interference coal mine electromechanical equipment start-stop detection method, magnetic field distribution around the three-phase cable is analyzed theoretically, magnetic flux leakage around the cable is detected through the magnetoresistance chip, effective detection of the magnetic flux leakage of the cable is ensured in combination with a related algorithm, and misjudgment causedby magnetic field offset at a certain position is prevented; and a magnetic shielding structure is designed, so that the magnetoresistance chip is prevented from being interfered by a surrounding magnetic field, and the stability and reliability of equipment start-stop detection are effectively improved.

Description

Technical field: [0001] The invention relates to the technical field of coal mine monitoring, in particular to an anti-interference type coal mine electromechanical equipment start-stop detection method. Background technique: [0002] The start-stop sensor is used to monitor the start-stop status of underground electromechanical equipment in coal mines, which plays a very important role in ensuring underground production efficiency, personnel safety and utilization of electromechanical equipment. At present, most start-stop sensors at home and abroad use coils to induce magnetic field strength to judge the working status of the equipment. Due to the large differences in coil probes, they cannot quantitatively reflect the relationship between the magnitude of the current in the cable and the magnetic field, so it cannot be a good guide Adjustment of the start-stop threshold. However, the downhole cable has an armor layer, which will attenuate the magnetic field to a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/09
CPCG01R33/09Y02A90/30
Inventor 纪亚强郝叶军王璐蒋泽高文平张海庆程一峰席宇轩
Owner TIANDI CHANGZHOU AUTOMATION
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