CN105510783A - Switchgear partial discharge detecting system based on ultrasonic signal - Google Patents
Switchgear partial discharge detecting system based on ultrasonic signal Download PDFInfo
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- CN105510783A CN105510783A CN201511009478.1A CN201511009478A CN105510783A CN 105510783 A CN105510783 A CN 105510783A CN 201511009478 A CN201511009478 A CN 201511009478A CN 105510783 A CN105510783 A CN 105510783A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
The invention provides a switchgear partial discharge detecting system based on an ultrasonic signal. The switchgear partial discharge detecting system comprises the components of a power supply module, a sensor module, a signal processing module, an AD conversion module, a single-chip microcomputer module, a communication module and an upper computer. The sensor module comprises an ultrasonic sensor and a preamplifier circuit and is used for acquiring an ultrasonic signal in an air medium. The signal processing module comprises an impedance matching circuit, a main amplifier circuit and an optoelectric coupler. The signal processing module realizes filtering, amplification and detection on the ultrasonic signal. The single-chip microcomputer module performs calculation on data and transmits the calculated data through a serial-port module. An MAX232 chip is utilized in the communication module. Ultrasonic data are finally transmitted to the upper computer by a communication circuit through a serial-port-to-USB line. The upper computer receives the signal which is transmitted from the single-chip microcomputer and performs empirical mode decomposition (EMD), thereby obtaining an intrinsic mode function. Then Hilbert transform is performed. A partial discharge signal is detected through analyzing a Hilbert spectrum.
Description
Technical field
The invention belongs to electrical detection technical field, a kind of partial discharge of switchgear detection system based on ultrasonic signal of specific design.
Background technology
High-tension switch cabinet is one of key components in electric system, and the progressively raising required power supply reliability along with electric system, the importance of electrical equipment status monitoring is outstanding day by day, and high-tension switch cabinet is no exception.There is a large amount of insulating support members in high-tension switch cabinet inside, these insulating element single-pieces are worth lower, if monitor one by one, not only substantially increase complexity and the cost of equipment, and can increase the failure rate of equipment.
During due to electric insulation generation shelf depreciation, can produce the fault-signals such as sound, optical, electrical, magnetic, in the starting stage that fault occurs, the light that electric discharge produces is often very faint, and blocking due to object, be only difficult to be found in the environment of dark.Fault electricity, magnetic signal then need comparatively complicated sensor, and form electromagnetic coupled with discharge loop.And acoustic signals does not have the problems referred to above, can be perceived very easily.In fact, run field personnel and usually tentatively judge electrical equipment malfunction with sense organ, therefore, in the occasion not needing accurately to judge, utilize the intensity of acoustic signals and sound wave transmission speed to monitor insulating element, especially the relative confined space that high-tension switch cabinet is such, has unique advantage.
Because acoustic signals background is complicated, be key wherein to noise processed and feature extraction in diagnostic procedure, except several special occasion, the extraction of acoustic characteristic signal remains the work of difficulty.In order to reduce the difficulty of feature signal extraction, sound wave monitoring research is often primarily focused on the frequency range of ultrasonic signal, and abandons the tonal range comparatively easily obtained, and employs a large amount of digital processing technologies.
Summary of the invention
A kind of partial discharge of switchgear detection system based on ultrasonic signal of the present invention, comprises power module, sensor assembly, signal processing module, AD conversion module, one-chip computer module, communication module, host computer.
Annexation between each module is:
Sensor assembly adopts sonac, the ultrasonic signal gathered in air dielectric carries out acoustic-electric conversion, convert acoustical signal to electric signal and pass to signal processing module, signal processing module realizes carrying out filtering, amplification, detection to ultrasonic signal, afterwards signal is sent into AD converter and convert simulating signal to digital signal, afterwards digital signal is sent into one-chip computer module, one-chip computer module is sent to communication module by its serial port module after carrying out computing to data, and ultrasound data is sent to host computer by communication module.Host computer receives the signal that transmits from single-chip microcomputer and carries out EEMD, obtains intrinsic mode function, then carries out Hilbert transform, by detecting local discharge signal to Hilbert spectrum analysis.
Described power module is obtained through conversion by alternating current 220V power supply, provides ± 5V power supply, provides ± 12V power supply to signal processing module, provide ± 5V power supply to AD converter, provide ± 3.3V power supply to one-chip computer module to sensor assembly.
Described sensor assembly comprises ultrasonic sensor, pre-amplification circuit and photoelectrical coupler.
Ultrasonic sensor adopts model to be ZC40-16P, and the centre frequency chosen is 40KHZ.The operational amplifier type number that pre-amplification circuit adopts is LM318.Photoelectrical coupler adopts TLP521-1.
Described signal processing module comprises filtering circuit, limiting amplifier, wave detector.
Described AD conversion module adopts AD1380JD chip.
Described one-chip computer module adopts STM32F103RBT6 chip.
Described communication module adopts MAX232 chip.
Described host computer is PC, host computer receives the signal that transmits from single-chip microcomputer and carries out EMD, EMD process flow diagram as shown in Figure 2, obtains intrinsic mode function after EMD, carry out Hilbert transform again, by detecting local discharge signal to Hilbert spectrum analysis.
A kind of partial discharge of switchgear detection system beneficial effect based on ultrasonic signal provided by the invention comprises:
(1) antijamming capability is strong, easy to use, can be in operation and detect the shelf depreciation of insulating inner in withstand voltage test, being applicable to the requirement of preventive trial
(2) at the uncharged any part placement sensor in switch board housing surface, discharge position can be measured more accurately, and the Signals & Systems power supply received can not have the contact of electricity, can not be subject to the interference of the electric signal of power-supply system.
Accompanying drawing explanation
Fig. 1 is the partial discharge of switchgear detection system the general frame based on ultrasonic signal.
Fig. 2 is EMD algorithm flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the invention provides a kind of partial discharge of switchgear detection system based on ultrasonic signal, comprise power module, sensor assembly, signal processing module, AD conversion module, one-chip computer module, communication module, host computer.
Annexation between each module is:
Sensor assembly adopts sonac, the ultrasonic signal gathered in air dielectric carries out acoustic-electric conversion, convert acoustical signal to electric signal and pass to signal processing module, signal processing module realizes carrying out filtering, amplification, detection to ultrasonic signal, afterwards signal is sent into AD converter and convert simulating signal to digital signal, afterwards digital signal is sent into one-chip computer module, one-chip computer module is sent to communication module by its serial port module after carrying out computing to data, and ultrasound data is sent to host computer by communication module.Host computer receives the signal that transmits from single-chip microcomputer and carries out EMD, obtains intrinsic mode function, then carries out Hilbert transform, by detecting local discharge signal to Hilbert spectrum analysis.
Described power module is obtained through conversion by alternating current 220V power supply, provides ± 5V power supply, provides ± 12V power supply to signal processing module, provide ± 5V power supply to AD converter, provide ± 3.3V power supply to one-chip computer module to sensor assembly.
Described sensor assembly comprises ultrasonic sensor, pre-amplification circuit and photoelectrical coupler.Ultrasonic sensor adopts model to be ZC40-16P, and the centre frequency chosen is 40KHZ.The operational amplifier type number that pre-amplification circuit adopts is LM318.Photoelectrical coupler adopts TLP521-1.The ultrasonic signal that sonac gathers in air dielectric carries out acoustic-electric conversion, converts acoustical signal to electric signal and passes to signal processing module.
Signal processing module realizes carrying out filtering, amplification, detection to ultrasonic signal, the mode that filtering adopts high-pass filtering to be combined with bandpass filtering, and the cutoff frequency of high-pass filtering is 20KHz, and the bandwidth of bandpass filtering is 20KHz ~ 60KHz.Limiting amplifier adopts input end clipping mode, and than simply utilizing amplifier nonlinearity to carry out amplitude limit, the stability of circuit is better.Wave detector is the pulse amplitude holding circuit that a duration of charging is very fast, discharge time is very slow.
AD converter adopts AD1380JD chip, converts the simulating signal transmitted from signal processing module to digital signal.
Single-chip microcomputer sampling STM32F103RBT6 chip, be the control core of whole pick-up unit, digital signal AD converter sent is sent out by its serial port module after computing.
Communication module adopts MAX232, and ultrasound data finally turns USB line via this communicating circuit by serial ports and is sent to host computer.
Host computer receives the signal that transmits from single-chip microcomputer and carries out EMD, and empirical mode decomposition is a kind of decomposition algorithm, is equivalent to carry out pre-service to data, and object is decomposed at original data, obtains the intrinsic mode function IMF being applicable to Hilbert transform.Suppose that original signal is, to carrying out the particular flow sheet of EMD as accompanying drawing 2, the beginning that figure China and foreign countries' cyclic representation new IMF solves, iterations is represented by i, and Inner eycle then represents the solution procedure of single IMF, and iterations is represented by k, finally.
EMD is carried out to signal and obtains intrinsic mode function, then carry out Hilbert transform, the hilbert spectrum obtained:, and be designated as.Integration will be carried out to the time, then can obtain the marginal spectrum of signal:
What marginal spectrum represented is the amplitude contribution margin of each Frequency point to whole signal.By finding the analysis of marginal spectrum to occur that higher magnitude possible occur shelf depreciation when some frequency ranges.
For the impact of exclusive PCR, provide the determination methods of undesired signal and local discharge signal:
First can obtain the ENERGY E 1 of 0 ~ 20kHz frequency range and the ENERGY E 2 of 30 ~ 50kHz frequency range, then compare the size of E1 and E2, as long as E2>E1, then think discharge signal, otherwise think undesired signal.
Claims (9)
1., based on a partial discharge of switchgear detection system for ultrasonic signal, it is characterized in that: comprise power module, sensor assembly, signal processing module, AD conversion module, one-chip computer module, communication module, host computer;
Annexation between each module is:
Sensor assembly adopts sonac, the ultrasonic signal gathered in air dielectric carries out acoustic-electric conversion, convert acoustical signal to electric signal and pass to signal processing module, signal processing module realizes carrying out filtering, amplification, detection to ultrasonic signal, afterwards signal is sent into AD converter and convert simulating signal to digital signal, afterwards digital signal is sent into one-chip computer module, one-chip computer module is sent to communication module by its serial port module after carrying out computing to data, and ultrasound data is sent to host computer by communication module; Host computer receives the signal that transmits from single-chip microcomputer and carries out EEMD, obtains intrinsic mode function, then carries out Hilbert transform, by detecting local discharge signal to Hilbert spectrum analysis.
2. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, it is characterized in that: described power module is obtained through conversion by alternating current 220V power supply, ± 5V power supply is provided to sensor assembly, ± 12V power supply is provided to signal processing module, there is provided ± 5V power supply to AD converter, provide ± 3.3V power supply to one-chip computer module.
3. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, is characterized in that: described sensor assembly comprises ultrasonic sensor, pre-amplification circuit and photoelectrical coupler.
4. sensor assembly as claimed in claim 3, is characterized in that: ultrasonic sensor adopts model to be ZC40-16P, and the centre frequency chosen is 40KHZ; The operational amplifier type number that pre-amplification circuit adopts is LM318; Photoelectrical coupler adopts TLP521-1.
5. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, is characterized in that: described signal processing module comprises filtering circuit, limiting amplifier, wave detector.
6. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, is characterized in that: described AD conversion module adopts AD1380JD chip.
7. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, is characterized in that: described one-chip computer module adopts STM32F103RBT6 chip.
8. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, is characterized in that: described communication module adopts MAX232 chip.
9. a kind of partial discharge of switchgear detection system based on ultrasonic signal as claimed in claim 1, it is characterized in that: described host computer is PC, host computer receives the signal that transmits from single-chip microcomputer and carries out EMD, obtain intrinsic mode function, carry out Hilbert transform again, by detecting local discharge signal to Hilbert spectrum analysis.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954695A (en) * | 2016-04-20 | 2016-09-21 | 国家电网公司 | Synchronization-based homogeneous-sensor mutation parameter recognizing method and device |
| CN106054045A (en) * | 2016-08-16 | 2016-10-26 | 安徽众升电力科技有限公司 | Partial discharge detection device |
| CN108427063A (en) * | 2018-02-01 | 2018-08-21 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of Mintrop wave localization method based on cross-validation method, empirical modal and Teager kurtosis |
| CN108562837A (en) * | 2018-04-19 | 2018-09-21 | 江苏方天电力技术有限公司 | A kind of power plant's partial discharge of switchgear ultrasonic signal noise-reduction method |
| CN108646158A (en) * | 2018-08-16 | 2018-10-12 | 国网山西省电力公司临汾供电公司 | Partial discharge detecting system for the experiment of high-tension switch cabinet ac voltage withstanding |
| CN109031069A (en) * | 2018-08-16 | 2018-12-18 | 国网山西省电力公司临汾供电公司 | The diagnostic system of high-tension switch cabinet Partial discharge signal |
| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
| CN111579945A (en) * | 2020-05-21 | 2020-08-25 | 华乘电气科技股份有限公司 | Integrated switch cabinet partial discharge intelligent sensor and information fusion state evaluation method thereof |
| CN111638431A (en) * | 2020-07-14 | 2020-09-08 | 国网山东省电力公司烟台供电公司 | Cubical switchboard partial discharge detection identification equipment based on ultrasonic detection method |
-
2015
- 2015-12-30 CN CN201511009478.1A patent/CN105510783A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954695A (en) * | 2016-04-20 | 2016-09-21 | 国家电网公司 | Synchronization-based homogeneous-sensor mutation parameter recognizing method and device |
| CN106054045A (en) * | 2016-08-16 | 2016-10-26 | 安徽众升电力科技有限公司 | Partial discharge detection device |
| CN108427063A (en) * | 2018-02-01 | 2018-08-21 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of Mintrop wave localization method based on cross-validation method, empirical modal and Teager kurtosis |
| CN108562837A (en) * | 2018-04-19 | 2018-09-21 | 江苏方天电力技术有限公司 | A kind of power plant's partial discharge of switchgear ultrasonic signal noise-reduction method |
| CN108646158A (en) * | 2018-08-16 | 2018-10-12 | 国网山西省电力公司临汾供电公司 | Partial discharge detecting system for the experiment of high-tension switch cabinet ac voltage withstanding |
| CN109031069A (en) * | 2018-08-16 | 2018-12-18 | 国网山西省电力公司临汾供电公司 | The diagnostic system of high-tension switch cabinet Partial discharge signal |
| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
| CN111579945A (en) * | 2020-05-21 | 2020-08-25 | 华乘电气科技股份有限公司 | Integrated switch cabinet partial discharge intelligent sensor and information fusion state evaluation method thereof |
| CN111638431A (en) * | 2020-07-14 | 2020-09-08 | 国网山东省电力公司烟台供电公司 | Cubical switchboard partial discharge detection identification equipment based on ultrasonic detection method |
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