A multi-physics joint monitoring device and monitoring method for partial discharge

Abstract

The present invention relates to the field of electrical engineering, and in particular to a multi-physics joint monitoring device and method for partial discharge. The monitoring device comprises: an acoustic-electric integrated sensor for collecting and outputting ultrasonic and ultra-high frequency signals of partial discharge within gas-insulated equipment; a timing signal storage module, a timing-spectrum conversion module, and a spectrum display module; the acoustic-electric integrated sensor is used to collect and output ultrasonic and ultra-high frequency signals of partial discharge within gas-insulated equipment; the timing signal storage module, through external triggering, synchronously collects and stores ultrasonic and ultra-high frequency signal timing waveforms and outputs a timing matrix; the timing-spectrum conversion module converts time vectors into phase vectors and time interval vectors for the timing matrix and outputs a spectrum matrix; and the spectrum display module plots ultrasonic flight spectra and ultra-high frequency phase spectra based on the spectrum matrix. Through the present invention, comprehensive perception and synchronous collection of multi-physics information are achieved, making partial discharge monitoring more comprehensive, accurate, and timely.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering, and in particular to a multi-physics joint monitoring device and a monitoring method for partial discharge. Background Art

[0002] Gas-insulated equipment (GIU) is a common type of electrical equipment used in power systems. It integrates conventional electrical equipment, such as circuit breakers, disconnectors, and busbars, within a cylindrical cavity filled with a high-pressure, electronegative gas for electrical insulation. Due to manufacturing processes or long-term operation, GIU can develop defects such as burrs on the guide rod tips and gaps in the insulation material. These defects can cause partial discharge under high-voltage electric fields. If not detected promptly, this can lead to insulation degradation and even serious electrical accidents, threatening the safe and stable operation of the power system.

[0003] Utilizing the physical phenomena associated with partial discharge (PD) enables timely and effective detection of PD. These phenomena include high-frequency current, ultrasound, and ultra-high-frequency electromagnetic waves. Consequently, various detection methods have emerged: high-frequency coils can detect the high-frequency current signals generated by charge movement during PD; ultrasonic probes can detect ultrasonic signals generated by gas expansion and contraction or mechanical vibration during the discharge process; and ultra-high-frequency antennas can detect ultra-high-frequency electromagnetic waves generated by the discharge. However, these methods all have limitations in field applications. High-frequency coils are susceptible to interference from external discharges, ultrasonic probes are affected by the equipment's own vibration noise, and ultra-high-frequency antennas are susceptible to interference from the complex electromagnetic noise environment on site. Therefore, when any of these detection methods are used alone, misjudgments and missed detections are likely to occur, hindering the judgment and maintenance arrangements of on-site operations and maintenance personnel. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a multi-physics joint monitoring device and monitoring method for partial discharge in view of the defects of the background technology, so as to perform more comprehensive, accurate and timely detection of partial discharge conditions inside gas-insulated equipment.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A multi-physics joint monitoring device for partial discharge, comprising: an acoustic-electric integrated sensor, a time sequence signal storage module, a time sequence-to-graph conversion module, and a graph display module;

[0007] The acoustic-electric integrated sensor is used to collect and output partial discharge ultrasound and ultra-high frequency signals in gas-insulated equipment;

[0008] The timing signal storage module is externally triggered to synchronously collect and store 10s of ultrasound and UHF signal timing waveforms and output a timing matrix;

[0009] The time series-spectrum conversion module converts the time vector into a phase vector and a time interval vector for the time series matrix output by the time series signal storage module, and outputs a spectrum matrix;

[0010] The spectrum display module draws the ultrasonic flight spectrum and the ultra-high frequency phase spectrum based on the spectrum matrix output by the timing-to-spectrum conversion module.

[0011] Furthermore, the acoustic-electric integrated sensor comprises: an ultra-high frequency sensing module, an ultrasonic sensing module, a filtering and amplifying module, a light source module and a photoelectric conversion module;

[0012] The UHF sensor module and the ultrasonic sensor module are located on the front of the acoustic-electric integrated sensor, and are installed toward the interior of the gas-insulated equipment, and are used to collect ultrasonic and UHF signals of discharge inside the gas-insulated equipment;

[0013] The filtering and amplifying module, the light source module and the photoelectric conversion module are located on the back of the acoustic-electric integrated sensor, and the ultrasonic and ultra-high frequency signals are outputted via the photoelectric conversion module and the filtering and amplifying module respectively.

[0014] Furthermore, the UHF sensing module is a circular ring antenna, and the operating frequency range of the circular ring antenna is 0.6 to 1 GHz.

[0015] Furthermore, the ultrasonic sensor module is of EFPI optical fiber type.

[0016] Furthermore, the output ends of the filtering and amplifying module and the photoelectric conversion module are led out through a BNC interface.

[0017] Furthermore, a monitoring method of a multi-physics joint monitoring device for partial discharge comprises the following steps:

[0018] Collect partial discharge ultrasonic and UHF signals, which are then photoelectrically converted and filtered and amplified for output;

[0019] Through external triggering, the system synchronously collects and stores 10s of ultrasonic and UHF signal timing waveforms and outputs the timing matrix.

[0020] For the time series matrix, convert the time vector into phase and time interval vectors, and output the spectrum matrix;

[0021] Draw ultrasonic flight maps and UHF phase maps based on the spectrum matrix.

[0022] Furthermore, the ultrasound and UHF signals are collected and stored by a timing signal storage module via an external triggering method. The timing signal storage module has a built-in comparator and sets a threshold value I H, the external trigger source is the filter amplifier module output I U , when the following formula is satisfied:

[0023] I U >I H (1)

[0024] The timing signal storage module starts to collect and store 10s signals;

[0025] The timing signal storage module stores the time vector t (0 to 10s) in matrix form, and the filter amplification module outputs the amplitude vector I U And the photoelectric conversion module outputs the amplitude vector I A , the sampling frequency is set to 100kHz, and the output dimension is 10 6 ×3 timing matrix D0:

[0026]

[0027] Furthermore, the time-to-spectrum conversion module performs output processing on the time matrix D0, first converting the time vector t into a phase vector θ, as shown in the following formula:

[0028]

[0029] Convert the time vector t to the time interval vector Δ t , as shown below:

[0030] Δt=t i -t i-1 , i>1 (4)

[0031] Output spectrum matrix D P :

[0032]

[0033] Furthermore, the UHF phase spectrum has a horizontal axis representing the phase vector θ and a vertical axis representing the output amplitude vector I of the filter amplification module. U The horizontal axis of the ultrasonic flight spectrum is the time interval vector Δt, and the vertical axis is the output amplitude vector I of the photoelectric conversion module. A .

[0034] The beneficial effects of the present invention are: ultra-high frequency signals and ultrasonic signals in the partial discharge process can be obtained simultaneously, realizing comprehensive perception of the multi-physical information of the partial discharge; synchronous signal acquisition is realized through subsequent filtering, amplification and acquisition storage modules, realizing synchronous acquisition of the multi-physical signals of the discharge; the collected signals are processed and displayed in real time on the user side, realizing multi-type data presentation, and facilitating analysis and repair by operation and maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the overall process of the multi-physics joint monitoring method for partial discharge in the present invention;

[0037] Figure 2 This is the main view of the acoustic and electrical integrated sensor;

[0038] Figure 3 Rear view of the integrated position acoustic and electrical sensor;

[0039] Figure numerals: 1. UHF sensing module; 2. Ultrasonic sensing module; 3. Filtering and amplifying module; 4. Light source module; 5. Photoelectric conversion module. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figure 1 A multi-physics joint monitoring device for partial discharge shown in the figure includes: an integrated acoustic and electrical sensor, a timing signal storage module, a timing-to-spectrum conversion module, and a spectrum display module; the integrated acoustic and electrical sensor is used to collect and output ultrasonic and ultra-high frequency signals of partial discharge in gas-insulated equipment; the timing signal storage module is triggered externally to synchronously collect and store 10 seconds of ultrasonic and ultra-high frequency signal timing waveforms, and output a timing matrix; the timing-to-spectrum conversion module converts the time vector of the timing matrix output by the timing signal storage module into a phase vector and a time interval vector, and outputs a spectrum matrix; the spectrum display module draws an ultrasonic flight spectrum and an ultra-high frequency phase spectrum based on the spectrum matrix output by the timing-to-spectrum conversion module.

[0043] During the specific implementation process, the acoustic-electric integrated sensor collects and outputs the ultrasonic and UHF signals of partial discharge. The timing signal storage module is externally triggered to synchronously collect and store 10s of timing waveforms from the ultrasonic and UHF signals, and outputs a timing matrix. The timing-spectrum conversion module processes the timing matrix output by the timing signal storage module and outputs a spectrum matrix. Finally, the spectrum matrix module draws the ultrasonic flight spectrum and UHF phase spectrum according to the spectrum matrix, and displays them in real time on the user side, realizing the presentation of multiple types of data, and making the partial discharge detection inside the gas-insulated equipment more comprehensive, accurate and timely.

[0044] like Figures 2 to 3 The acoustic-electric integrated sensor shown includes: an ultra-high frequency sensor module 1, an ultrasonic sensor module 2, a filter-amplifier module 3, a light source module 4, and a photoelectric conversion module 5; the ultra-high frequency sensor module 1 and the ultrasonic sensor module 2 are located on the front of the acoustic-electric integrated sensor, installed toward the interior of the gas-insulated equipment, and are used to collect ultrasonic and ultra-high frequency signals discharged inside the gas-insulated equipment; the filter-amplifier module 3, the light source module 4, and the photoelectric conversion module 5 are located on the back of the acoustic-electric integrated sensor, and the ultrasonic and ultra-high frequency signals are output via the photoelectric conversion module 5 and the filter-amplifier module 3, respectively.

[0045] As a preferred embodiment of the above, the acoustic and electrical integrated sensor is installed at the prefabricated hand hole position, and the UHF sensing module 1 is a circular antenna. The operating frequency range of the circular antenna is 0.6 to 1 GHz. The circular antenna can increase the antenna length in a limited space to improve the signal reception effect, thereby ensuring the collection of UHF signals.

[0046] As a preferred embodiment of the above, the ultrasonic sensor module 2 is of EFPI optical fiber type, which has the advantages of simple structure, small size and high sensitivity. It can be directly placed inside the gas-insulated equipment to detect partial discharge ultrasonic signals. There are two main arrangements of EFPI sensors: multi-point distribution and single-point array, which have the advantages of high precision and easy installation and use respectively. During use, the operator can choose the installation scheme according to actual needs.

[0047] The output ends of the filtering and amplifying module 3 and the photoelectric conversion module 5 are brought out through the BNC interface. The BNC interface has good anti-interference ability, which reduces mutual interference between signals. In addition, the signal bandwidth is larger than that of ordinary interfaces, which can achieve better signal response effect.

[0048] A monitoring method of a multi-physics joint monitoring device for partial discharge, comprising the following steps:

[0049] Collect partial discharge ultrasonic and UHF signals, which are then photoelectrically converted and filtered and amplified for output;

[0050] Through external triggering, the system synchronously collects and stores 10s of ultrasonic and UHF signal timing waveforms and outputs the timing matrix.

[0051] For the time series matrix, convert the time vector into phase and time interval vectors, and output the spectrum matrix;

[0052] Draw ultrasonic flight maps and UHF phase maps based on the spectrum matrix.

[0053] Ultrasonic and UHF signals are collected and stored through the timing signal storage module via external triggering. The timing signal storage module has a built-in comparator and sets the threshold I H , the external trigger source is the output of filter amplifier module 3 I U , when the following formula is satisfied:

[0054] I U >I H (1)

[0055] The timing signal storage module starts to collect and store 10s signals;

[0056] The time sequence signal storage module stores the time vector t (0 to 10 s) in a matrix form, and the filter amplification module 3 outputs the amplitude vector I U And the photoelectric conversion module 5 outputs the amplitude vector I A , the sampling frequency is set to 100kHz, and the output dimension is 10 6 ×3 timing matrix D0:

[0057]

[0058] The spectrum matrix is ​​processed by the time-to-spectrum conversion module. First, the time vector t is converted into a phase vector θ, as shown in the following formula:

[0059]

[0060] Convert the time vector t to the time interval vector Δ t , as shown below:

[0061] Δt=t i -t i-1 , i>1 (4)

[0062] Output spectrum matrix D P :

[0063]

[0064] The horizontal axis of the UHF phase spectrum is the phase vector θ, and the vertical axis is the output amplitude vector I of the filter amplifier module 3. UThe horizontal axis of the ultrasonic flight spectrum is the time interval vector Δt, and the vertical axis is the output amplitude vector I of the photoelectric conversion module 5. A .

[0065] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-physics joint monitoring device for partial discharge, characterized in that: include: Acoustic-electric integrated sensor, time sequence signal storage module, time sequence-to-atlas conversion module, and atlas display module; The acoustic-electric integrated sensor is used to collect and output partial discharge ultrasound and ultra-high frequency signals in gas-insulated equipment; The timing signal storage module is externally triggered to synchronously collect and store 10s of ultrasound and UHF signal timing waveforms and output a timing matrix; The time series-spectrum conversion module converts the time vector into a phase vector and a time interval vector for the time series matrix output by the time series signal storage module, and outputs a spectrum matrix; The spectrum display module draws the ultrasonic flight spectrum and the UHF phase spectrum based on the spectrum matrix output by the timing-spectrum conversion module; The spectrum matrix is ​​processed by the time sequence-spectrum conversion module to output the time sequence matrix D0. First, the time vector t is converted into a phase vector θ, as shown in the following formula: The time vector t is converted into a time interval vector Δt as shown below: Δt=t i -t i-1 ,i>1 (4) Where, t i is the time vector at time i, t i-1 is the time vector at time i-1; Output spectrum matrix D P :

2. The multi-physics joint monitoring device for partial discharge according to claim 1, characterized in that: The acoustic-electric integrated sensor includes: a UHF sensor module, an ultrasonic sensor module, a filter amplifier module, a light source module, and a photoelectric conversion module; The UHF sensor module and the ultrasonic sensor module are located on the front of the acoustic-electric integrated sensor, and are installed toward the interior of the gas-insulated equipment, and are used to collect ultrasonic and UHF signals of discharge inside the gas-insulated equipment; The filtering and amplifying module, the light source module and the photoelectric conversion module are located on the back of the acoustic-electric integrated sensor, and the ultrasonic and ultra-high frequency signals are outputted via the photoelectric conversion module and the filtering and amplifying module respectively.

3. The multi-physics joint monitoring device for partial discharge according to claim 2, characterized in that: The UHF sensor module is a circular ring antenna, and the operating frequency range of the circular ring antenna is 0.6 to 1 GHz.

4. The multi-physics joint monitoring device for partial discharge according to claim 2, characterized in that: The ultrasonic sensor module is of EFPI optical fiber type.

5. The multi-physics joint monitoring device for partial discharge according to claim 2, characterized in that: The output ends of the filtering and amplifying module and the photoelectric conversion module are led out through BNC interfaces.

6. A monitoring method for a multi-physics combined monitoring device for partial discharge according to any one of claims 2 to 5, comprising the following steps: Collect partial discharge ultrasonic and UHF signals, which are then photoelectrically converted and filtered and amplified for output; Through external triggering, the system synchronously collects and stores 10s of ultrasonic and UHF signal timing waveforms and outputs the timing matrix. For the time series matrix, convert the time vector into phase and time interval vectors, and output the spectrum matrix; Draw ultrasonic flight maps and UHF phase maps based on the spectrum matrix.

7. The monitoring method of a multi-physics joint monitoring device for partial discharge according to claim 6, characterized in that: The ultrasonic and ultra-high frequency signals are collected and stored by a timing signal storage module through an external triggering method. The timing signal storage module has a built-in comparator and sets a threshold value I H , the external trigger source is the filter amplifier module output I U , when the following formula is satisfied: I U >I H (1) The timing signal storage module starts to collect and store 10s signals; The timing signal storage module stores the time vector t in matrix form, where t is 0 to 10s, and the filter amplification module outputs the amplitude vector I U And the photoelectric conversion module outputs the amplitude vector I A , the sampling frequency is set to 100kHz, and the output dimension is 10 6 ×3 timing matrix D0:

8. The monitoring method of a multi-physics joint monitoring device for partial discharge according to claim 6, characterized in that: The horizontal axis of the UHF phase spectrum is the phase vector θ, and the vertical axis is the output amplitude vector I of the filter amplification module. U The horizontal axis of the ultrasonic flight spectrum is the time interval vector Δt, and the vertical axis is the output amplitude vector I of the photoelectric conversion module. A .

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