CN211401631U - Acoustic fingerprint detection system of circuit breaker - Google Patents
Acoustic fingerprint detection system of circuit breaker Download PDFInfo
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- CN211401631U CN211401631U CN201921327072.1U CN201921327072U CN211401631U CN 211401631 U CN211401631 U CN 211401631U CN 201921327072 U CN201921327072 U CN 201921327072U CN 211401631 U CN211401631 U CN 211401631U
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Abstract
The utility model discloses an acoustics fingerprint detection system of circuit breaker, it includes main control module and signal acquisition module, signal acquisition module includes acquisition card, sound signal acquisition unit and current signal acquisition unit, the acquisition card is used for under main control module's control, control sound signal acquisition unit with current signal acquisition unit is right respectively mechanical vibration signal with current signal carries out synchronous acquisition, main control module still is used for comparing the analysis to the signal of gathering to acquire the acoustics fingerprint characteristic parameter of sign mechanical state. The utility model discloses an acoustics fingerprint detection system of circuit breaker can judge circuit breaker equipment's mechanical state and mechanical fault more accurately to can detect the mechanical state of circuit breaker more effectively.
Description
Technical Field
The utility model relates to a switchgear mechanical state monitoring technology field especially relates to an acoustics fingerprint detection system of circuit breaker.
Background
The breaker is a safety guard of a power system, has the capacity of bearing normal working current for a long time, bearing short-circuit current for a short time and breaking normal and fault current, and plays an important role in reliable operation of a power grid. The circuit breaker has a plurality of mechanical parts, most of the mechanical parts are movable parts, the opening and closing working process of the circuit breaker is an energy release and transmission process in a short time, in the operation process, the action of a mechanism, a transmission part, an insulating pull rod and the like is given out from a control command, and finally the opening and closing of a contact are carried out along with a series of mechanical movement and impact events, so that a series of mechanical vibration and sound can be generated. The mechanical vibration signal is a rich information carrier containing a lot of device status information. Therefore, relevant sound vibration signals of the circuit breaker are collected, and a certain signal processing method and a certain state evaluation technology are utilized, so that the mechanical characteristics of the circuit breaker can be effectively judged.
In practical application, because the operating environment that the circuit breaker is located is complicated changeable, its sound that produces in the divide-shut brake process is more weak through the propagation of air to the sensor back signal, easily receives external environment noise's interference to make sound sensor be difficult for receiving the mechanical vibration signal of effectual circuit breaker, or receive wrong mechanical vibration signal, and then make wrong judgement to the mechanical state of circuit breaker.
SUMMERY OF THE UTILITY MODEL
To the above problem, an object of the utility model is to provide a can accurately detect the acoustics fingerprint detection system of the mechanical state of circuit breaker.
In order to achieve the above object, an embodiment of the present invention provides an acoustic fingerprint detection system for a circuit breaker, which includes a main control module and a signal acquisition module.
The signal acquisition module comprises an acquisition card, a sound signal acquisition unit and a current signal acquisition unit; the sound signal acquisition unit is used for acquiring mechanical vibration signals of the opening and closing of the external circuit breaker; the current signal acquisition unit is used for acquiring current signals on a switching-on and switching-off coil of an external circuit breaker; the acquisition card is used for controlling the sound signal acquisition unit and the current signal acquisition unit to respectively and synchronously acquire the mechanical vibration signal and the current signal under the control of the main control module.
The main control module is also used for comparing and analyzing the acquired signals to acquire acoustic fingerprint characteristic parameters representing the mechanical state.
As an improvement of the above scheme, the acoustic fingerprint detection system of the circuit breaker further comprises a power supply management module; the power supply management module is used for providing a working power supply for the main control module and the signal acquisition module.
As an improvement of the scheme, the main control module comprises an industrial personal computer.
As an improvement of the scheme, the industrial personal computer is PS PXI-9106.
As an improvement of the above scheme, the sound signal collection unit includes a sound sensor.
As an improvement of the scheme, the current signal acquisition unit comprises a current clamp.
As an improvement of the scheme, the type of the acquisition card is PXI/PCI-3321.
The embodiment of the utility model provides an acoustics fingerprint detection system of circuit breaker, through adopting main control module and signal acquisition module, and utilize the collection card to carry out synchronous collection to the vibration signal of circuit breaker and the current signal that corresponds with it, thereby can make detection system can be according to the mechanical vibration signal of gathering and the current signal that corresponds with it in step, carry out more effective and accurate detection to the mechanical state of circuit breaker, avoided detection system only through gather the analysis single, easily receive the mechanical vibration signal that external environment noise disturbed, and can't carry out the defect of accurate judgement to the mechanical state of circuit breaker; the mechanical state and the mechanical fault of the circuit breaker equipment can be judged more effectively and accurately by analyzing and comparing the synchronously acquired vibration signal and the current signal, the working reliability of the circuit breaker is improved, the operating mechanism of the circuit breaker is prevented from continuously rotating under the fault state to damage the equipment, and the mechanical characteristic of the circuit breaker is effectively detected.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the embodiments will be briefly described below, and obviously, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an acoustic fingerprint detection system of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of an acoustic fingerprint detection system of a circuit breaker according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
An embodiment of the utility model provides an acoustics fingerprint detection system of circuit breaker, it is concrete, please refer to fig. 1, for the utility model provides a structure schematic diagram of acoustics fingerprint detection system of circuit breaker, it includes main control module and signal acquisition module.
In an embodiment of the present invention, the signal acquisition module includes an acquisition card, a sound signal acquisition unit and a current signal acquisition unit; the sound signal acquisition unit is used for acquiring mechanical vibration signals of the opening and closing of the external circuit breaker; the current signal acquisition unit is used for acquiring current signals on a switching-on and switching-off coil of an external circuit breaker; the acquisition card is used for controlling the sound signal acquisition unit and the current signal acquisition unit to respectively and synchronously acquire the mechanical vibration signal and the current signal under the control of the main control module; the main control module is also used for comparing and analyzing the acquired signals to acquire acoustic fingerprint characteristic parameters representing the mechanical state.
The embodiment of the utility model provides an acoustics fingerprint detection system of circuit breaker, through adopting main control module and signal acquisition module, and utilize the collection card to carry out synchronous collection to the vibration signal of circuit breaker and the current signal that corresponds with it, thereby can make detection system can be according to the mechanical vibration signal of gathering and the current signal that corresponds with it in step, carry out more effective and accurate detection to the mechanical state of circuit breaker, avoided detection system only through gather the analysis single, easily receive the mechanical vibration signal that external environment noise disturbed, and can't carry out the defect of accurate judgement to the mechanical state of circuit breaker; the mechanical state and the mechanical fault of the circuit breaker equipment can be judged more effectively and accurately by analyzing and comparing the synchronously acquired vibration signal and the current signal, the working reliability of the circuit breaker is improved, the operating mechanism of the circuit breaker is prevented from continuously rotating under the fault state to damage the equipment, and the mechanical characteristic of the circuit breaker is effectively detected.
It should be noted that, in the embodiment of the present invention, the sound signal collecting unit and the current signal collecting unit respectively collect the mechanical vibration signal and the current signal of the opening/closing switch of the circuit breaker synchronously, and the collected signals are transmitted to the main control module through the collecting card for processing. After the sound signal acquisition unit and the current signal acquisition unit acquire the signals, a main control module needs to perform a series of analysis processing on the signals, acoustic fingerprint characteristic parameters representing the mechanical state can be acquired, and then the mechanical state of the circuit breaker equipment is judged according to the acoustic fingerprint characteristic parameters, and whether the operation of the circuit breaker breaks down or not is judged. At present, a plurality of methods for analyzing and processing vibration signals exist, and each method has the advantages and the application range. The embodiment of the utility model provides an adopt extraction, frequency domain characteristic analysis, wavelet analysis method to mechanical oscillation's chronogenesis characteristic to handle vibration signal. Of course, the main control module can also adopt an instantaneous energy method and a sudden change signal starting point extraction method for signal processing, and the protection range of the utility model can not be limited by the method. The utility model discloses an acoustics fingerprint detection system, circuit breaker use spring operating mechanism as an example, and its main theory of operation is: the circuit breaker opening and closing coil is electrified, the current of the coil begins to rise, and the sound signal acquisition unit and the current signal acquisition unit acquire signals at the moment; then the electromagnetic electrodynamic force of the circuit breaker can overcome the resistance, so that the movable iron core of the opening electromagnet starts to move to generate friction, and the sound signal acquisition unit and the current signal acquisition unit acquire signals at the moment; the current of a coil for opening and closing the breaker starts to decline along with the movement of the iron core until the movable iron core impacts the opening lock latch, then the movable iron core and the static iron core collide with each other to generate impact, and the sound signal acquisition unit and the current signal acquisition unit acquire signals at the moment; at the moment, because the iron core stops moving, the coil current of the opening and closing of the circuit breaker begins to rise again, the iron core increases along with the current, when the stress of the iron core reaches a certain degree, the opening latch bolt rotates to impact the opening and keep the pawl, and the sound signal acquisition unit and the current signal acquisition unit acquire signals at the moment; the opening brake keeps the braking pawl to rotate, the main crank arm is released, the opening brake braking pawl impacts a stop pin on the main crank arm, and the sound signal acquisition unit and the current signal acquisition unit acquire signals at the moment; the opening brake keeps the pawl continuously impacting and rubbing the upper stop block on the main crank arm, under the action of the opening brake spring force, the transmission crank arm drives the main crank arm to rotate through the pull rod, the breaker body is opened, the opening brake is kept at the opening brake position by the precompression force of the opening brake spring, and the sound signal acquisition unit and the current signal acquisition unit acquire signals at the moment; at this point, due to the impact of the mechanism action, the opening action is finished, and the acquisition card sends all the acquired mechanical vibration signals and current signals corresponding to the mechanical vibration signals to the main control module for subsequent processing. The main control module carries out frequency domain characteristic analysis on the acquired signals, the complex signals are converted into a form expressed by frequency components by adopting Fourier transformation, and a plurality of mechanical faults of the circuit breaker can be well detected by analyzing frequency structure information. When a mechanical fault occurs in the circuit breaker, the amplitude of some wave peaks in a time domain waveform can be changed. Due to the suppression or enhancement of frequency domain components of the vibration signal by the fault, some frequency components of the vibration signal may be attenuated while other frequency components may be enhanced. The method comprises the steps of decomposing signals into different frequency ranges by adopting a wavelet analysis method, obtaining energy distribution maps of different ranges of original signals by solving energy values of different frequency band component signals, and further judging relevant mechanical characteristics of the circuit breaker, so that the mechanical state of the circuit breaker can be more effectively detected.
Preferably, in this embodiment, the power supply management module is further included; the power supply management module is used for providing a working power supply for the main control module and the signal acquisition module so that the whole detection system can normally work under different industrial environment conditions.
Preferably, in this embodiment, please refer to fig. 2, which is a schematic connection diagram of an acoustic fingerprint detection system of a circuit breaker according to an embodiment of the present invention, wherein the main control module includes an industrial personal computer. The model of the industrial personal computer is preferably PS PXI-9106 in the embodiment. PS PXI-9106 is a portable PXI machine case of 6-slot stack structure, compatible PXI/compactPCI module and possess general PXI function, can carry out good processing to the signal of gathering, and the operation is reliable simultaneously, and the simple operation can directly build swift test system fast on PXI-9106.
Preferably, in this embodiment, the sound signal collection unit includes a sound sensor. Specifically, referring to fig. 2, the sound sensor is placed 1.5 meters away from the circuit breaker mechanism box, and the direction of the sound sensor is opposite to the circuit breaker opening and closing spring, so as to measure the sound signal generated in the circuit breaker opening and closing process. In this embodiment, the frequency response characteristic of the acoustic sensor is a free field, a sensitivity of 50mV/Pa, a frequency range of 3.75Hz-20000Hz, a lower limit frequency of 1-3Hz, a natural noise of 15.5dBre20uPa, and a dynamic range (3% distortion limit) of 137dBre20 μ Pa.
Preferably, in this embodiment, the current signal collecting unit includes a current clamp. Specifically, referring to fig. 2, the current sensor is preferably an AC/DC current clamp, which, unlike a conventional AC transformer, uses the hall effect principle to obtain the magnitude of the current by measuring the magnetic field strength generated by a live conductor in a semiconductor chip, and the response is instantaneous. The current clamp has a linear output and a temperature compensation electronic system, and ensures accurate linear output under wide dynamic range and wide frequency. The measuring range of the current sensor is 1mA-4.5A, the sensitivity is 1mA/mV, and the bandwidth is 2 kHz. The current clamp is arranged in the mechanism box, the current clamp is clamped on a coil power supply lead wire during testing, and a tested signal is converted into a voltage signal through the BNC interface and is output to the acquisition card.
When the breaker receives an opening or closing signal, an opening or closing coil in the mechanism box is electrified, the current signal acquisition unit acquires a current signal, and a sound signal generated in the opening and closing process is acquired by the sound sensor. The time corresponding to the start of the current signal is the start of the sound signal, and the signal before the time is other interference signals such as background noise.
Preferably, in this embodiment, referring to fig. 2, the type of the acquisition card is preferably PXI/PCI-3321. The PXI/PCI-3321 has a synchronous data acquisition function, the single card provides 8 paths of 16bit synchronous analog input channels, and the single channel has the highest sampling rate of 500 kS/s; 8 digital input/output ports and 10 multifunctional digital input/output ports; a 2-way counter; the on-board low-pass filter with the cut-off frequency of 200kHz effectively reduces high-frequency noise and frequency aliasing, and can be effectively applied to the data synchronous acquisition occasions with high-speed continuous data recording and high channel number.
The embodiment of the utility model provides an acoustics fingerprint detection system of circuit breaker, through adopting main control module and signal acquisition module, and utilize the collection card to carry out synchronous collection to the vibration signal of circuit breaker and the current signal that corresponds with it, thereby can make detection system can be according to the mechanical vibration signal of gathering and the current signal that corresponds with it in step, carry out more effective and accurate detection to the mechanical state of circuit breaker, avoided detection system only through gather the analysis single, easily receive the mechanical vibration signal that external environment noise disturbed, and can't carry out the defect of accurate judgement to the mechanical state of circuit breaker; the mechanical state and the mechanical fault of the circuit breaker equipment can be judged more effectively and accurately by analyzing and comparing the synchronously acquired vibration signal and the current signal, the working reliability of the circuit breaker is improved, the operating mechanism of the circuit breaker is prevented from continuously rotating under the fault state to damage the equipment, and the mechanical characteristic of the circuit breaker is effectively detected.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. An acoustic fingerprint detection system for a circuit breaker, comprising: the system comprises a main control module and a signal acquisition module;
the signal acquisition module comprises an acquisition card, a sound signal acquisition unit and a current signal acquisition unit; the sound signal acquisition unit is used for acquiring mechanical vibration signals of the opening and closing of the external circuit breaker; the current signal acquisition unit is used for acquiring current signals on a switching-on and switching-off coil of an external circuit breaker; the acquisition card is used for controlling the sound signal acquisition unit and the current signal acquisition unit to respectively and synchronously acquire the mechanical vibration signal and the current signal under the control of the main control module;
the main control module is also used for comparing and analyzing the acquired signals to acquire acoustic fingerprint characteristic parameters representing the mechanical state.
2. The acoustic fingerprint detection system of a circuit breaker of claim 1, further comprising a power management module; the power supply management module is used for providing a working power supply for the main control module and the signal acquisition module.
3. The acoustic fingerprint detection system of a circuit breaker of claim 1, wherein the main control module comprises an industrial personal computer.
4. The acoustic fingerprint detection system of a circuit breaker according to claim 3, wherein the model of the industrial personal computer is PS PXI-9106.
5. The acoustic fingerprint detection system of a circuit breaker of claim 1, wherein the sound signal collection unit comprises a sound sensor.
6. The acoustic fingerprint detection system of circuit breaker of claim 1, wherein the current signal acquisition unit comprises a current clamp.
7. The acoustic fingerprint detection system of circuit breaker of claim 1, wherein said acquisition card is model PXI/PCI-3321.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921327072.1U CN211401631U (en) | 2019-08-14 | 2019-08-14 | Acoustic fingerprint detection system of circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921327072.1U CN211401631U (en) | 2019-08-14 | 2019-08-14 | Acoustic fingerprint detection system of circuit breaker |
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| CN211401631U true CN211401631U (en) | 2020-09-01 |
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| CN201921327072.1U Active CN211401631U (en) | 2019-08-14 | 2019-08-14 | Acoustic fingerprint detection system of circuit breaker |
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