CN104749495A - Device and method for performing electrified detection and diagnosing power equipment defects - Google Patents
Device and method for performing electrified detection and diagnosing power equipment defects Download PDFInfo
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- CN104749495A CN104749495A CN201310740777.7A CN201310740777A CN104749495A CN 104749495 A CN104749495 A CN 104749495A CN 201310740777 A CN201310740777 A CN 201310740777A CN 104749495 A CN104749495 A CN 104749495A
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Abstract
The invention provides a device and a method for performing electrified detection and diagnosing power equipment defects. The device includes an ultrasonic detector and a host machine; the ultrasonic detector is connected with the host machine through a data line; the ultrasonic detector includes an ultrasonic sensor, a signal processing circuit, a temperature and humidity sensor, a data output interface, a power supplying power source and a housing; the housing includes a receiving opening, a connection piece and a handle; a sound outlet of the receiving opening is fixedly connected with the handle through the connection piece; the output end of the ultrasonic sensor is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the data output interface; the temperature and humidity sensor is arranged in the housing, and the output end of the temperature and humidity sensor is connected to the data output interface; and the power supplying power source is connected with the signal processing circuit, the ultrasonic sensor and the humidity and temperature sensor respectively. The ultrasonic detector can perform non-contact remote electrified detection, and precise defect positioning and deterioration degree diagnosis can be realized.
Description
Technical field
The present invention relates to a kind of power equipments defect pick-up unit, be specifically related to the device and method of a kind of live detection and diagnosing electric power defect.
Background technology
Power equipment is after operation a period of time, and some equipment because a variety of causes causes insulation to decline, thus can cause bad partial discharge phenomenon.When a partial discharge occurs, the apparatus insulated life-span can be affected.Concrete, when discharging, due to high-energy electron or the impact accelerating electronics at every turn, particularly long-term shelf depreciation effect, all can cause physical influence and the chemical reaction of various ways, during as charging point shock bubble outer wall, just may interrupt the chemical bond of insulation and cracking occurs, destroy the molecular structure of insulation, cause insulation degradation, accelerate insulation damages process, finally cause the generation of electrical equipment fault, cause grid power blackout, thus bring about great losses to electricity consumption user and electric power enterprise.
In prior art, generally adopt PD meter to detect power equipment and whether partial discharge phenomenon occurs, mainly have the following disadvantages: (1) operates in high pressure conditions due to power equipment, this kind of mode is a kind of close contact detection mode, sensor is needed to paste detection site, therefore, there is potential safety hazard, be difficult to effectively promote the use of.(2) PD meter is qualitative detection, can only detect power equipment and whether there occurs shelf depreciation, and can not locate.(3) effective range of Sensor monitoring is less, and rig-site utilization is comparatively inconvenient; In addition, cannot to defect analysis, the just size of reaction detection numerical value.
Summary of the invention
For the defect that prior art exists, the invention provides the device and method of a kind of live detection and diagnosing electric power defect, remote live detection can not be contacted, the accurate location of defect and the diagnosis of degradation can be realized.
The technical solution used in the present invention is as follows:
The invention provides the device of a kind of live detection and diagnosing electric power defect, comprising: ultrasonic detector and main frame; Described ultrasonic detector is connected by data line with described main frame;
Described ultrasonic detector comprises: ultrasonic sensor, signal processing circuit, wet temperature sensor, data output interface, power supply and shell; Described shell is horn shape, and its inside surface is minute surface, comprises receiving port, web member and handle; The sound mouth diameter of described receiving port is less than into sound mouth diameter, and this sound mouth is fixedly connected with described handle by described web member; Described ultrasonic sensor is fixed to the inside of described web member, described signal processing circuit and described power supply are fixed to the inside of described handle, and, the output terminal of described ultrasonic sensor is connected with the input end of described signal processing circuit, and the output terminal of described signal processing circuit is connected with described data output interface; Described wet temperature sensor is built in described enclosure, and its output terminal is connected to described data output interface; Described power supply is connected with described signal processing circuit, described ultrasonic sensor and described wet temperature sensor respectively.
Preferably, described signal processing circuit is detection analog loopback, sound wave amplifying return circuit and the digital loop of connecting.
Preferably, described sound wave amplifying return circuit output terminal is also connected with audio output interface.
Preferably, described receiving port is 15 degree of tubaeform cones, and the housing of described receiving port adopts engineering plastics to make; Described web member is fasten aluminium, and one end and the described receiving port of this insulated connecting piece are threaded connection.
Preferably, described handle is cylindrical; Also power switch is provided with on the surface of described handle; Described power switch is electrically connected with described power supply.
Preferably, described power supply is lithium battery.
Preferably, also alignment clamp is comprised; Described alignment clamp is fixedly mounted on the intersection area of described receiving port and described web member.
The present invention also provides a kind of method of live detection and diagnosing electric power defect, comprises the following steps:
S1, the detected power equipment of ultrasonic detector scanning, if receive raw ultrasound signals, then carries out pre-service to described raw ultrasound signals, obtains the ultrasonic signal after processing;
S2, the ultrasonic signal after described process is transferred to main frame through data output interface by described ultrasonic detector; Meanwhile, the temperature humidity value that wet temperature sensor also collects by described ultrasonic detector uploads to main frame;
S3, described main frame carries out wave form analysis and audio analysis to the ultrasonic signal after described process and in conjunction with detecting distance, described temperature humidity value, device category, equipment state comprehensive factor, obtains initial analysis result; Data in described initial analysis result and database are compared, diagnoses out detected power equipment degradation.
Preferably, in S1, pre-service is carried out to described raw ultrasound signals and is specially:
Described raw ultrasound signals is carried out to filtering, amplified process; After S3, also comprise:
S4, described main frame shows the dynamic waveform of the ultrasonic signal after the described process received, and, diagnostic result is stored in memory.
Preferably, S3 is specially:
S31, by following formulae discovery initial assay values:
Initial assay values=-17.651+28.651X
1+ 89.836X
2-0.029X
3+ 0.832X
4;
Wherein, X
1for device category; X
2: be equipment state; X
3for detection waveform mean value dB; X
4for virtual value;
Wherein, virtual value X
4signal value+the offset of=detection;
Wherein, offset=-1.6106 (stand-off distance values-distance (m))-0.015 (reference temperature value-humidity %))+0.1335 (reference temperature value-temperature (DEG C));
S32, the reference value of diagnosis is 0.5, if initial assay values is greater than 0.5, then shows that equipment degradation is menace level; If initial assay values is less than or equal to 0.5, then equipment degradation is general grade.
Beneficial effect of the present invention is as follows:
(1) ultrasonic sensor does not need directly to contact tested equipment, is the non-contacting detection mode of one, ensures testing staff's safety;
(2) whole ultrasonic detector adopts portable construction design, and overall weight is no more than 800 grams, has volume little, lightweight, directly can use by hand-held, facilitate the partial discharge phenomenon of any terrain environment live detection power equipment.
(3) this device detecting distance reaches 30 meters, can not contact remote live detection, can realize the accurate location of defect and the diagnosis of degradation.
(4) integrate collection, detect, diagnose, help electric company operations staff to prevent the generation of electrical equipment fault, decrease power off time, improve the reliability of operation of power networks.Compared with traditional ultra-sonic defect detector, the ultrasonic signal of the characteristic frequency produced when this device just gathers power equipment shelf depreciation, itself does not launch ultrasonic signal.
Accompanying drawing explanation
Fig. 1 is the device circuit schematic diagram of live detection provided by the invention and diagnosing electric power defect;
Fig. 2 is the one-piece construction schematic diagram of ultrasonic detector provided by the invention;
Fig. 3 is the cut-open view of receiving port provided by the invention;
Fig. 4 is the profile diagram of receiving port provided by the invention;
Fig. 5 is Fig. 3 right view;
Fig. 6 is Fig. 3 left view;
Fig. 7 is the front section view of handle provided by the invention;
Fig. 8 is the back side cut-open view of handle provided by the invention;
Fig. 9 is the profile diagram of handle provided by the invention;
Figure 10 is Fig. 8 right view;
Figure 11 is the profile diagram of alignment clamp provided by the invention;
Figure 12 is Figure 10 right view;
Figure 13 is Figure 11 cut-open view;
Wherein, 1---receiving port; 2---web member; 3---handle.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
Composition graphs 1-Figure 13, the invention provides the device of a kind of live detection and diagnosing electric power defect, comprising: ultrasonic detector and main frame; Described ultrasonic detector is connected by data line with described main frame;
Described ultrasonic detector comprises: ultrasonic sensor, signal processing circuit, wet temperature sensor, data output interface, power supply and shell; Described shell is horn shape, and its inside surface is minute surface, comprises receiving port, web member and handle; The sound mouth diameter of described receiving port is less than into sound mouth diameter, and this sound mouth is fixedly connected with described handle by described web member; Described ultrasonic sensor is fixed to the inside of described web member, described signal processing circuit and described power supply are fixed to the inside of described handle, and, the output terminal of described ultrasonic sensor is connected with the input end of described signal processing circuit, and the output terminal of described signal processing circuit is connected with described data output interface; Described wet temperature sensor is built in described enclosure, and its output terminal is connected to described data output interface; Described power supply is connected with described signal processing circuit, described ultrasonic sensor and described wet temperature sensor respectively.
Wherein, signal processing circuit is detection analog loopback, sound wave amplifying return circuit and the digital loop of connecting., the signal for collecting ultrasonic sensor carries out analog to digital conversion, filtering and amplification process, and uploads to main frame by digital loop.In addition, sound wave amplifying return circuit output terminal is also connected with audio output interface, by audio output interface output audio sound.
Receiving port is 15 degree of tubaeform cones, can position check point, improves the precision of detection; The housing of receiving port adopts engineering plastics to make, and as ABS+PC material, effectively can reduce the weight of whole detection probe, improve intensity.Further, receiving port inside surface adopts minute surface, can improve the sound signal intensity arriving ultrasonic sensor, improves accuracy of detection.
Web member adopts insulated connecting piece, as fasten aluminium.One end of insulated connecting piece with receiving port by being threaded.Ultrasonic sensor adopts Miniature ultrasonic sensor, is built in fine aluminium part components interior, effectively can strengthens antijamming capability.
As is seen in figs 7-10, handle is cylindrical, conveniently holds with hand-held.Also power switch is provided with on the surface of handle; Power switch is electrically connected with power supply.Wherein, power supply is lithium battery.Lithium battery is built in handle inner, is easy to open and changes battery, has advantage easy to use.
As figs 11-13, also alignment clamp is comprised.Alignment clamp is fixedly mounted on the intersection area of receiving port and insulated connecting piece.
The principle of work of the device detection power equipment partial discharge phenomenon of this live detection and diagnosing electric power defect is:
Because power equipment discharge is a complicated gas discharge physical process, there will be a lot of phenomenon, as, when occurring when discharging, the intermolecular of region of discharge will produce violent shock, this shock macroscopically shows as a kind of pressure, because electric discharge is a series of pulse, so consequent pressure wave is also impulse form, containing various frequency component, its medium frequency is ultrasound wave more than 20KHz.Gathered by the ultrasound wave produced power equipment shelf depreciation, by this signal by filtering and amplify process, pass in main frame, through wave form analysis, namely diagnosable go out detected power equipment degradation.
Specifically comprise the following steps:
S1, the detected power equipment of ultrasonic detector scanning, if receive raw ultrasound signals, then carries out pre-service to described raw ultrasound signals, obtains the ultrasonic signal after processing;
Wherein, pre-service is specially: raw ultrasound signals is carried out to filtering, amplified process.In addition, ultrasonic detector can be set to only receive frequency is the raw ultrasound signals of 40 ± 1kHz.
S2, the ultrasonic signal after described process is transferred to main frame through data output interface by described ultrasonic detector; Meanwhile, the temperature humidity value that wet temperature sensor also collects by described ultrasonic detector uploads to main frame;
S3, described main frame carries out wave form analysis and audio analysis to the ultrasonic signal after described process and in conjunction with detecting distance, described temperature humidity value, obtains initial analysis result; Data in described initial analysis result and database are compared, diagnoses out detected power equipment degradation and deteriorated position.
Carry out wave form analysis to ultrasonic signal, Main Analysis mode is: ultrasonic discriminating, and amplitude is differentiated, auto adapted filtering etc.
Concrete diagnostic method is: S31, by following formulae discovery initial assay values:
Initial assay values=-17.651+28.651X
1+ 89.836X
2-0.029X
3+ 0.832X
4;
Wherein, X
1for device category, such as: pillar insulator, suspended insulator, lightning arrester, fuse, cable termination, switchgear, transformer, disconnector;
X
2: be equipment state, such as, crackle, erosion, carbonize, puncture, loose contact, burn into filth, albefaction, surfacial spalling, surface be good; X
1and X
2value be get through great number tested data research.
X
3for detection waveform mean value dB; X
4for virtual value;
Wherein, virtual value X
4signal value+the offset of=detection;
Wherein, offset=-1.6106 (stand-off distance values-distance (m))-0.015 (reference temperature value-humidity %))+0.1335 (reference temperature value-temperature (DEG C)); Generally stand-off distance values is 13.5 meters, and reference temperature value is 24 degree, and reference humidity value is 50%;
S32, the reference value of diagnosis is 0.5, if initial assay values is greater than 0.5, then shows that equipment degradation is menace level; If initial assay values is less than or equal to 0.5, then equipment degradation is general grade.
After S3, also comprise:
S4, described main frame shows the dynamic waveform of the ultrasonic signal after the described process received, and, diagnostic result is stored in memory.
Such as, using diagnostic result as a text files memory in the storer that main frame is built-in, user consults by display, reaches and detects the object of power equipments defect.Host configuration mobile memory card, by data importing PC computer, can facilitate examining report to generate, prints, inquires about.
As can be seen here, the device and method of live detection provided by the invention and diagnosing electric power defect, is mainly used in the Diagnostic Examination And Repair of Electric Power Facilities process in power industry, has the following advantages:
(1) ultrasonic sensor does not need directly to contact tested equipment, is the non-contacting detection mode of one, ensures testing staff's safety;
(2) whole ultrasonic detector adopts portable construction design, and overall weight is no more than 800 grams, has volume little, lightweight, directly can use by hand-held, facilitate the partial discharge phenomenon of any terrain environment live detection power equipment.
(3) this device detecting distance reaches 30 meters, can not contact remote live detection, can realize the accurate location of defect and the diagnosis of degradation.
(4) integrate collection, detect, diagnose, help electric company operations staff to prevent the generation of electrical equipment fault, decrease power off time, improve the reliability of operation of power networks.Compared with traditional ultra-sonic defect detector, the ultrasonic signal of the characteristic frequency produced when this device just gathers power equipment shelf depreciation, itself does not launch ultrasonic signal.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (10)
1. a device for live detection and diagnosing electric power defect, is characterized in that, comprising: ultrasonic detector and main frame; Described ultrasonic detector is connected by data line with described main frame;
Described ultrasonic detector comprises: ultrasonic sensor, signal processing circuit, wet temperature sensor, data output interface, power supply and shell; Described shell is horn shape, and its inside surface is minute surface, comprises receiving port, web member and handle; The sound mouth diameter of described receiving port is less than into sound mouth diameter, and this sound mouth is fixedly connected with described handle by described web member; Described ultrasonic sensor is fixed to the inside of described web member, described signal processing circuit and described power supply are fixed to the inside of described handle, and, the output terminal of described ultrasonic sensor is connected with the input end of described signal processing circuit, and the output terminal of described signal processing circuit is connected with described data output interface; Described wet temperature sensor is built in described enclosure, and its output terminal is connected to described data output interface; Described power supply is connected with described signal processing circuit, described ultrasonic sensor and described wet temperature sensor respectively.
2. the device of live detection according to claim 1 and diagnosing electric power defect, is characterized in that, described signal processing circuit is detection analog loopback, sound wave amplifying return circuit and the digital loop of connecting.
3. the device of live detection according to claim 2 and diagnosing electric power defect, is characterized in that, described sound wave amplifying return circuit output terminal is also connected with audio output interface.
4. the device of live detection according to claim 1 and diagnosing electric power defect, is characterized in that, described receiving port is 15 degree of tubaeform cones, and the housing of described receiving port adopts engineering plastics to make; Described web member is fasten aluminium, and one end and the described receiving port of this insulated connecting piece are threaded connection.
5. the device of live detection according to claim 1 and diagnosing electric power defect, is characterized in that, described handle is cylindrical; Also power switch is provided with on the surface of described handle; Described power switch is electrically connected with described power supply.
6. the device of live detection according to claim 1 and diagnosing electric power defect, is characterized in that, described power supply is lithium battery.
7. the device of live detection according to claim 1 and diagnosing electric power defect, is characterized in that, also comprises alignment clamp; Described alignment clamp is fixedly mounted on the intersection area of described receiving port and described web member.
8. a method for live detection and diagnosing electric power defect, is characterized in that, comprises the following steps:
S1, the detected power equipment of ultrasonic detector scanning, if receive raw ultrasound signals, then carries out pre-service to described raw ultrasound signals, obtains the ultrasonic signal after processing;
S2, the ultrasonic signal after described process is transferred to main frame through data output interface by described ultrasonic detector; Meanwhile, the temperature humidity value that wet temperature sensor also collects by described ultrasonic detector uploads to main frame;
S3, described main frame carries out wave form analysis and audio analysis to the ultrasonic signal after described process and in conjunction with detecting distance, described temperature humidity value, device category, equipment state comprehensive factor, obtains initial analysis result; Data in described initial analysis result and database are compared, diagnoses out detected power equipment degradation.
9. the method for live detection according to claim 8 and diagnosing electric power defect, is characterized in that, in S1, carries out pre-service be specially described raw ultrasound signals:
Described raw ultrasound signals is carried out to filtering, amplified process; After S3, also comprise:
S4, described main frame shows the dynamic waveform of the ultrasonic signal after the described process received, and, diagnostic result is stored in memory.
10. the method for live detection according to claim 8 and diagnosing electric power defect, is characterized in that, S3 is specially:
S31, by following formulae discovery initial assay values:
Initial assay values=-17.651+28.651X
1+ 89.836X
2-0.029X
3+ 0.832X
4;
Wherein, X
1for device category; X
2: be equipment state; X
3for detection waveform mean value dB; X
4for virtual value;
Wherein, virtual value X
4signal value+the offset of=detection;
Wherein, offset=-1.6106 (stand-off distance values-distance (m))-0.015 (reference temperature value-humidity %))+0.1335 (reference temperature value-temperature (DEG C));
S32, the reference value of diagnosis is 0.5, if initial assay values is greater than 0.5, then shows that equipment degradation is menace level; If initial assay values is less than or equal to 0.5, then equipment degradation is general grade.
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| CN108135262A (en) * | 2016-09-20 | 2018-06-08 | 惠州市吉瑞科技有限公司深圳分公司 | A kind of electronic cigarette and recognition methods |
| CN114910758A (en) * | 2022-05-17 | 2022-08-16 | 国网黑龙江省电力有限公司佳木斯供电公司 | Switch equipment partial discharge detection method based on intelligent sound and electricity combined sensing |
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| CN114910758B (en) * | 2022-05-17 | 2023-05-12 | 国网黑龙江省电力有限公司佳木斯供电公司 | Switch equipment partial discharge detection method based on intelligent sound-electricity combined sensing |
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