Balanced differential-type metal detection sensor and insulating paper detection device

Abstract

The invention discloses a balanced differential-type metal detection sensor and an insulating paper detection device, which relate to the technical field of metal detection devices. The sensor comprises a closed rectangular coil assembly, a sine excitation module, a differential amplifier module, a signal processing module, an A / D processing module and a data processing module, wherein the closed rectangular coil assembly comprises two receiving coils with the same structure and a transmitting coil; the two receiving coils are symmetrically arranged at two sides of the transmitting coil; the signal output end of the sine excitation module is connected with the transmitting coil; the two receiving coils are respectively connected with two input ends of the differential amplifier module; and the output end of the differential amplifier module is connected with the input end of the data processing module sequentially through the signal processing module and the A / D processing module. The sensor has high sensitivity and stability, and when the sensor is applied to the detection device, the detection device can acquire high detection precision.

Description

technical field [0001] The invention relates to the technical field of metal detection devices, in particular to a balanced differential metal detection sensor and an insulating paper detection device. Background technique [0002] As the insulating cardboard in the transformer system, its electrical and mechanical properties directly determine the quality of the insulation system. During the processing and production of insulating cardboard, sometimes tiny metal particles are inevitably pressed into the cardboard or stuck on the surface of the cardboard. There are many types of metal particles, such as metal particles in wood, rust powder of equipment, copper mesh, aluminum powder, etc. If not detected, it will seriously affect its insulation performance. If it is put into use according to conventional indicators, it may cause Below the safe voltage level, voltage breakdown occurs and the insulation system fails. Therefore, it is very necessary to install a set of interna...

AI Technical Summary

Problems solved by technology

Among them, the monitoring principle of the frequency difference detection method is to use the frequency difference discrimination result between the frequency of the detection oscillator and the reference oscillator, but the stability of the oscillator parameters under test is greatly affected, and the sensitivity and response speed are low; the impedance detection method It is difficult to distinguish the extremely small signal changes for very small detection metals, so it is not suitable for the detection of metal particles inside insulating cardboard; the two receiving coils of the differential voltage detection method have the same parameters and are symmetrically installed on both sides of the transmitting coil. When the coil When the installation is basically symmetrical and the parameters are the same, the differential voltage basically does not contain the basic component, but only the detection signal, so the sensitivity is greatly improved

[0005] In addition, traditional automatic detection devices mostly use metal detection devices to automatically move to detect particles, such as using stepping motors to drive steering gears to control detectors for arc scanning, etc. Errors or detection results are wrong; traditional detection methods and detection devices are more or less affected by the inside of the device such as an oscillator, or cannot detect and distinguish tiny metal particles that are difficult to observe with the naked eye, such as tiny metal particles inside insulating cardboard. It is more wasteful to rely on manual detection energy

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