Detection equipment and detection method for accurately positioning short circuit between multiple strands of all-insulated stranded wires

Abstract

The invention provides a detection device and a detection method for accurately positioning short circuit between multiple strands of all-insulated stranded wires and a manufacturing method thereof. The detection device comprises two wire cores capable of judging short circuit; the signal transmitting end is used for transmitting an alternating audio signal of 1-10KHZ connected with one wire core; the receiving end comprises a handheld shell, a probe assembly and a sound output device, the probe assembly is arranged at the front end of the shell and can induce magnetic field changes, the sound output device is connected with the probe assembly, the probe assembly converts the induced magnetic field changes into electric signals, and the electric signals are converted into audible sound through the sound output device. During detection, a short-circuit wire core pair is confirmed firstly, then a signal is injected, a technician holds a stethoscope to move along a cable, a probe senses an enhanced magnetic field generated at a short-circuit point due to sudden change of a current path, and the enhanced magnetic field is converted into clear and distinguishable sound change, so that rapid, accurate and non-destructive positioning of the short-circuit point is realized. The device is simple in structure, convenient to operate, high in positioning precision and suitable for troubleshooting of various complex cables.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to a testing device and method for accurately locating short circuits between multi-strand fully insulated stranded wires. Background Technology

[0002] Multi-strand fully insulated stranded wires (such as common cables and magnet wires) are widely used in power, communications, automotive, aerospace and other fields. Due to their complex structure, multiple independently insulated cores are twisted together and may be wrapped with an outer sheath, making it extremely difficult to locate the fault point when an internal short circuit occurs.

[0003] In the production of multi-strand fully insulated stranded wires and fully insulated transposed conductors used in power equipment, the multiple insulated cores require stranding and a series of forming processes after stranding. External forces can easily cause insulation damage between the insulated cores, leading to short circuits. These short circuits are often only discovered after the entire coil of conductor has been produced, when manufacturers test the insulation between the individual cores. Furthermore, it is difficult for manufacturers to effectively locate the short circuit between two wires within the entire coil, making insulation repair impossible and forcing the entire coil to be scrapped, thus increasing production costs.

[0004] Currently, a reel of multi-strand fully insulated stranded wire and fully insulated transposed wire weighs several hundred kilograms. If a short circuit is found between two cores after production, and the short circuit point cannot be effectively located for insulation repair, the reel must be scrapped. Using the above method to locate the short circuit point can greatly reduce the production cost of such products. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by proposing a detection device and method for accurately locating short circuits between multi-strand fully insulated stranded wires, as well as a method for manufacturing the same, thereby resolving the issues present in the background art.

[0006] This invention provides a detection device and method for accurately locating short circuits between multi-strand fully insulated stranded wires, as well as a method for manufacturing the same.

[0007] A detection device for precise location of short circuits between multi-strand fully insulated stranded wires, comprising: two cores capable of being determined to have a short circuit; The signal transmitting end is connected to one of the wire cores, which transmits a 1-10kHz alternating audio signal. The receiving end includes a handheld housing, a probe assembly disposed at the front end of the housing that can sense changes in the magnetic field, and a sound output device connected to the probe assembly. The probe assembly converts the sensed changes in the magnetic field into electrical signals, and the sound output device converts them into audible sound.

[0008] Preferably, the sound output device is a stethoscope.

[0009] Preferably, the two wire cores are connected to a multimeter or insulation tester.

[0010] Preferably, the probe assembly is a probe with a voice coil horn.

[0011] Preferably, the probe assembly capable of sensing changes in the magnetic field is a magnetic induction coil connected to a signal amplifier circuit. The amplifier circuit amplifies and / or filters the sensed weak electrical signal before driving the sound output device to produce sound.

[0012] A detection method is also provided, which uses the detection equipment for precise location of short circuits between multi-strand fully insulated stranded wires as described in any of the above claims. Short circuit confirmation steps: Confirm that there are two short-circuited cores in the multi-strand wire; Signal injection step: Connect the signal transmitting end to the two wire cores and inject an alternating current signal of 1kHz to 10kHz into them; Positioning steps: Hold the probe assembly and move it along the outside of the stranded wire. By observing the changes in sound from the sound output device, determine the location where the sound change is strongest. This location is the short circuit point.

[0013] Advantages and beneficial effects of the present invention: Precise location: Utilizing the principle that the magnetic field increases dramatically at the point of short circuit, the fault point can be located with an accuracy of centimeters or even millimeters, which is far superior to the segmented measurement method.

[0014] Non-destructive: It achieves non-destructive testing without stripping the cable insulation or cutting the cable.

[0015] Easy to operate: The equipment has a simple structure and low cost. Technicians can operate it after simple training, without the need for complex data analysis.

[0016] Strong anti-interference capability: It selects 1-10kHz audio signals, which can effectively avoid 50 / 60Hz power frequency and its harmonic interference, thus improving the signal-to-noise ratio and positioning reliability.

[0017] Intuitive and efficient: It allows for direct judgment of sound changes by human ear, with rapid response, greatly improving the efficiency of investigation. Attached Figure Description

[0018] Figure 1 This is a logic block diagram of the present invention; Figure 2 This is a schematic diagram of a stranded wire embodiment; Figure 3 This is a structural schematic diagram of two embodiments of the stranded wire. Detailed Implementation

[0019] refer to Figures 1-3 This invention provides a detection device and method for accurately locating short circuits between multi-strand fully insulated stranded wires, as well as a method for manufacturing the same.

[0020] A detection device for precise location of short circuits between multi-strand fully insulated stranded wires, comprising: two cores capable of being determined to have a short circuit; The signal transmitting end is connected to one of the wire cores, which transmits a 1-10kHz alternating audio signal. The receiving end includes a handheld housing, a probe assembly disposed at the front end of the housing that can sense changes in the magnetic field, and a sound output device connected to the probe assembly. The probe assembly converts the sensed changes in the magnetic field into electrical signals, and the sound output device converts them into audible sound.

[0021] In one embodiment, the sound output device is a stethoscope.

[0022] In one embodiment, the two conductors are connected to a multimeter or insulation tester.

[0023] In one embodiment, the probe assembly is a probe with a voice coil horn.

[0024] In one embodiment, the probe assembly capable of sensing changes in the magnetic field is a magnetic induction coil connected to a signal amplifier circuit. The amplifier circuit amplifies and / or filters the sensed weak electrical signal before driving the sound output device to produce sound.

[0025] A detection method is also provided, which uses the aforementioned detection equipment for precise location of short circuits between multi-strand fully insulated stranded wires, and includes the following steps: Short circuit confirmation steps: Confirm that there are two short-circuited cores in the multi-strand wire; Signal injection step: Connect the signal transmitting end to the two wire cores and inject an alternating current signal of 1kHz to 10kHz into them; Location Steps: Holding the probe assembly, move it along the outside of the stranded wire. Observe the changes in sound output from the sound output device to determine the location of the strongest sound abrupt change; this location is the short circuit point. The detection method involves passing a 1-10kHz alternating audio current signal between the two short-circuited strands. The current will create an alternating magnetic field around the conductor. At the short circuit point, the current path will change abruptly, and the magnetic field strength will increase sharply accordingly. The probe assembly will vibrate and emit sound upon sensing the change in the magnetic field. Technicians use a stethoscope to hold the receiver end and search along the direction of the short-circuited conductor, locating the precise location point by observing the changes in sound.

[0026] This invention enables precise location of short circuits, allowing conductor manufacturers to effectively pinpoint the location and perform targeted insulation repairs, while significantly reducing production costs.

[0027] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention, but it should not be construed as limiting the specific implementation of the invention to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A detection device for precise location of short circuits between multi-strand fully insulated stranded wires, characterized in that, include: It can be determined that there is a short circuit between the two wire cores; The signal transmitting end is connected to one of the wire cores, which transmits a 1-10kHz alternating audio signal. The receiving end includes a handheld housing, a probe assembly disposed at the front end of the housing that can sense changes in the magnetic field, and a sound output device connected to the probe assembly. The probe assembly converts the sensed changes in the magnetic field into electrical signals, and the sound output device converts them into audible sound.

2. The detection device for precise location of short circuits between multi-strand fully insulated stranded wires according to claim 1, characterized in that: The sound output device is a stethoscope.

3. The detection device for precise positioning of short circuits between multi-strand fully insulated stranded wires according to claim 1, characterized in that: Connect the two wire cores to a multimeter or insulation tester.

4. The detection device for precise positioning of short circuits between multi-strand fully insulated stranded wires according to claim 1, characterized in that: The probe assembly is a probe with a voice coil horn.

5. The detection device for precise positioning of short circuits between multi-strand fully insulated stranded wires according to claim 1, characterized in that: The probe assembly capable of sensing changes in the magnetic field consists of a magnetic induction coil connected to a signal amplifier circuit. The amplifier circuit amplifies and / or filters the sensed weak electrical signal before driving the sound output device to produce sound.

6. A detection method, employing the detection equipment for precise location of short circuits between multi-strand fully insulated stranded wires as described in any one of claims 1-5, characterized in that: Includes the following steps: Short circuit confirmation steps: Confirm that there are two short-circuited cores in the multi-strand wire; Signal injection step: Connect the signal transmitting end to the two wire cores and inject an alternating current signal of 1kHz to 10kHz into them; Positioning steps: Hold the probe assembly and move it along the outside of the stranded wire. By observing the changes in sound from the sound output device, determine the location where the sound change is strongest. This location is the short circuit point.

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