CN104020403A - Diagnostic system for composite apparatus fault positioning - Google Patents

Diagnostic system for composite apparatus fault positioning Download PDF

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Publication number
CN104020403A
CN104020403A CN201410279660.8A CN201410279660A CN104020403A CN 104020403 A CN104020403 A CN 104020403A CN 201410279660 A CN201410279660 A CN 201410279660A CN 104020403 A CN104020403 A CN 104020403A
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CN
China
Prior art keywords
signal
vibration
mechanical oscillation
diagnostic
vibration transducer
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CN201410279660.8A
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Chinese (zh)
Inventor
徐华
肖国磊
刘黎
刘岩
邵先军
李思南
曹俊平
陈斌
陈晓锦
周平
沈中元
闫东
顾文涛
Original Assignee
国家电网公司
国网浙江省电力公司电力科学研究院
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Priority to CN201410279660.8A priority Critical patent/CN104020403A/en
Publication of CN104020403A publication Critical patent/CN104020403A/en

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Abstract

The invention provides a diagnostic system for composite apparatus fault positioning. The diagnostic system comprises a plurality of vibration sensors, a signal communication device, a host computer and a plurality of signal emitters, wherein the number of the signal emitters is equal to that of the vibration sensors. In mechanical vibration signals produced when composite apparatus breaks down and collected by the vibration sensors, one sought vibration sensor serves as a benchmark vibration sensor according to the fact that the vibration sensor closest to the fault point has the advantages of being large in vibration signal, long in width of duration time of vibration signal pulse and short in transmission time of the vibration signal, and then the specific fault position of the composite apparatus is determined according to the time difference between the propagation time of the mechanical vibration signals sent by the benchmark vibration sensor and the propagation time of the mechanical vibration signals of the vibration sensors adjacent to the benchmark vibration sensors. Compared with rough diagnosing in the prior art, accurate positioning of the composite apparatus is achieved through the diagnostic system for composite apparatus fault positioning.

Description

A kind of diagnostic system of combined electrical apparatus localization of fault
Technical field
The application relates to combined electrical apparatus technical field, in particular, relates to a kind of diagnostic system of combined electrical apparatus localization of fault.
Background technology
Combined electrical apparatus is by two or more electrical equipment, by wiring requirement, forms a whole and each electrical equipment still keeps the device of former performance.
For guaranteeing to resume operation fast after combined electrical apparatus fault, need to accurately locate the fault of combined electrical apparatus.The conventional diagnostic means of combined electrical apparatus localization of fault has endoscopic diagnosis, SF at present 6analyte diagnosis.Endoscopic diagnosis mainly, by combined electrical apparatus being uncapped tracing trouble position, therefore, has certain blindness, and for conductor the situation to tank skin flashover, if ablation situation is slighter, be difficult to find.SF 6analyte diagnosis generally can only be oriented fault gas chamber, for atmospheric air chamber, particularly atmospheric air chamber in withstand voltage process is broken down while puncturing and can only be diagnosed roughly.
In summary it can be seen, how a kind of realizing of the diagnosis system of combined electrical apparatus localization of fault is provided is those skilled in the art's technical matterss urgently to be resolved hurrily to the accurate location of combined electrical apparatus fault.
Summary of the invention
In view of this, the invention provides a kind of diagnostic system of combined electrical apparatus localization of fault, to realize the accurate location to combined electrical apparatus fault.
A diagnostic system for combined electrical apparatus localization of fault, comprising:
A plurality of vibration transducers, described in each, vibration transducer is all fixed on the housing of combined electrical apparatus, the mechanical oscillation signal when gathering described combined electrical apparatus fault;
Signal projector with quantity such as described vibration transducers, described in each, signal projector is connected with a described vibration transducer, described signal projector is for obtaining the mechanical oscillation signal of the described vibration transducer output being connected with this signal projector, and to described mechanical oscillation signal amplify, transmission after filtering, analog to digital conversion;
The signal and communication device being all connected with signal projector described in each, described signal and communication device is for receiving the mechanical oscillation signal that signal projector sends described in each, and forwards this mechanical oscillation signal;
The main frame being connected with described signal and communication device, each mechanical oscillation signal that described main frame forwards for obtaining described signal and communication device, and from described each mechanical oscillation signal, find vibration signal amplitude large, or vibration signal duration of pulse width is large, or short mechanical oscillation signal of vibration signal travel-time, and using the vibration transducer that produces this mechanical oscillation signal as benchmark vibration transducer, the travel-time of the mechanical oscillation signal sending according to described benchmark vibration transducer, the time difference in the travel-time of the mechanical oscillation signal that each vibration transducer adjacent with described benchmark vibration transducer sends is determined the concrete abort situation of described combined electrical apparatus.
Preferably, described main frame is also for the signal graph of mechanical oscillation signal that described benchmark vibration transducer is sent, mate with the standard spectrogram in the vibration signal spectrogram storehouse of the described combined electrical apparatus different faults type of pre-stored, obtain the current fault type of described combined electrical apparatus.
Preferably, described main frame is also for sending to described signal and communication device the steering order that vibration transducer parameter arranges.
Preferably, described vibration transducer is connected by signal wire with described signal projector.
Preferably, described signal projector comprises: signal amplification circuit, signal filter circuit, digital signal processor and antenna;
Described signal amplification circuit is for amplifying the mechanical oscillation signal receiving;
Described signal filter circuit is connected with described signal amplification circuit, and described signal filter circuit carries out filtering for the mechanical oscillation signal to after amplifying;
Described digital signal processor is connected with described signal filter circuit, and described digital signal processor is for carrying out analog to digital conversion to filtered mechanical oscillation signal;
Described antenna is connected with described digital signal processor, and described antenna is for sending the mechanical oscillation signal after analog to digital conversion.
Preferably, described digital signal processor is connected with described antenna by serial communication interface.
Preferably, also comprise the data buffer being connected with described digital signal processor.
Preferably, described signal amplification circuit, described signal filter circuit, described digital signal processor, described data buffer and described serial communication interface are all arranged in shielding box.
Preferably, the power supply of described signal projector is battery.
Preferably, described signal and communication device comprises: antenna and the serial communication interface being connected with described antenna.
Preferably, described signal and communication device is provided with general-purpose serial bus USB interface, and described signal and communication device is connected with described main frame by described USB interface.
Preferably, also comprise: display;
Described display is connected with described main frame, for showing each mechanical oscillation signal.
From above-mentioned technical scheme, can find out, the invention provides a kind of diagnostic system of combined electrical apparatus localization of fault, in mechanical oscillation signal when the combined electrical apparatus fault of each vibration transducer collection, according to distance fault, putting nearest vibration transducer, to have vibration signal large, large and the short feature of vibration signal travel-time of vibration signal duration of pulse width, using the vibration transducer finding as benchmark vibration transducer, the travel-time of the mechanical vibration that then benchmark vibration transducer sends, the mistiming in the travel-time of the mechanical oscillation signal that each vibration transducer adjacent with this benchmark vibration transducer sends, determine the concrete abort situation of combined electrical apparatus.Rough diagnosis compared to existing technology, the realizing of the diagnosis system of combined electrical apparatus localization of fault provided by the invention the accurate location to combined electrical apparatus.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the structural representation of the diagnostic system of the disclosed a kind of combined electrical apparatus localization of fault of the embodiment of the present invention;
Fig. 2 is the position view of discharge source in the disclosed a kind of combined electrical apparatus of the embodiment of the present invention;
Fig. 3 is the structural representation of the disclosed a kind of signal projector of the embodiment of the present invention;
Fig. 4 is the structural representation of the disclosed a kind of signal and communication device of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of diagnostic system of combined electrical apparatus localization of fault, to realize the accurate location to combined electrical apparatus fault.
Referring to Fig. 1, the structural representation of the diagnostic system of the disclosed a kind of combined electrical apparatus localization of fault of the embodiment of the present invention, comprise: a plurality of vibration transducers 11 (only illustrating 2 in Fig. 1), signal projector 12, signal and communication device 13 and main frame 14, wherein, the quantity such as signal projector 12 and vibration transducer 11;
Wherein:
Each vibration transducer 11 is all fixed on the housing of combined electrical apparatus, the mechanical oscillation signal when gathering this combined electrical apparatus fault.
It should be noted that, the mechanical oscillation signal when mechanical oscillation signal that vibration transducer 11 gathers is mainly the on-the-spot ac voltage withstanding of combined electrical apparatus or operation insulation breakdown, the response frequency of this mechanical oscillation signal is 0~3kHZ.
Vibration transducer 11 can be fixed on the housing of combined electrical apparatus by binding strap, generally at vibration transducer 11 of independent air chamber intermediate arrangement, if air chamber is larger, for example, every Preset Time section (5m), arrange one, the quantity basis actual conditions of required vibration transducer 11 and determining.
Each signal projector 12 is connected with a vibration transducer 11, signal projector 12 is for obtaining the mechanical oscillation signal of vibration transducer 11 output being connected with this signal projector 12, and described mechanical oscillation signal is amplified, sent after filtering, analog to digital conversion.
Signal and communication device 13 is all connected with each signal projector 12, the mechanical oscillation signal that signal and communication device 13 sends for receiving each signal projector 12, and forward this mechanical oscillation signal.
Main frame 14 is connected with signal and communication device 13, each mechanical oscillation signal that main frame 14 forwards for obtaining signal and communication device 13, and from each mechanical oscillation signal, find vibration signal amplitude large, or vibration signal duration of pulse width is large, or short mechanical oscillation signal of vibration signal travel-time, and using the vibration transducer that produces this mechanical oscillation signal as benchmark vibration transducer, the travel-time of the mechanical oscillation signal sending according to described benchmark vibration transducer, the time difference in the travel-time of the mechanical oscillation signal that each vibration transducer adjacent with described benchmark vibration transducer sends is determined the concrete abort situation of described combined electrical apparatus.
It should be noted is that, distance fault is put nearest vibration transducer 11 and is had that vibration signal is large, vibration signal duration of pulse width large and short feature of vibration signal travel-time, therefore, the present invention using produce that vibration signal amplitude is large or vibration signal duration of pulse width is large or the vibration transducer of the mechanical oscillation signal that the vibration signal travel-time is short as benchmark vibration transducer.
In conjunction with Fig. 2, the position view of discharge source in the disclosed a kind of combined electrical apparatus of the embodiment of the present invention, the present invention, according to the principle of mechanical oscillation signal digital combined electrical apparatus abort situation, is specifically described below:
Suppose that discharge source 01 is between vibration transducer 21 and vibration transducer 22, distance between two vibration transducers is L (known), making vibration transducer 21 and the distance of discharge source 01 is x, vibration transducer 22 is (L-x) with the distance of discharge source 01, according to formula (1)
Δt=t 2-t 1=(L-x)/c-x/c???(1)
Wherein, Δ t is that travel-time and the vibration transducer 21 that vibration transducer 22 sends mechanical oscillation signal to main frame sends the mistiming in the travel-time of mechanical oscillation signal, t to main frame 2for vibration transducer 22 sends the travel-time of mechanical oscillation signal, t to main frame 1for vibration transducer 21 sends the travel-time of mechanical oscillation signal to main frame, c is the speed (being generally a few km per second) that mechanical oscillation signal is propagated along the housing of combined electrical apparatus.
Obtain formula (2),
x = 1 2 ( L - cΔt ) - - - ( 2 )
The speed c propagating along the housing of combined electrical apparatus due to the distance L between two vibration transducers, mechanical oscillation signal is known, and the mistiming, Δ t also can calculate, and therefore, can determine the accurate abort situation of combined electrical apparatus.
It should be noted is that, a vibration transducer in two vibration transducers in the present embodiment is benchmark vibration transducer.
In summary it can be seen, in the mechanical oscillation signal of the present invention when the combined electrical apparatus fault of each vibration transducer 11 collections, according to distance fault, putting nearest vibration transducer, to have vibration signal large, large and the short feature of vibration signal travel-time of vibration signal duration of pulse width, using the vibration transducer finding 11 as benchmark vibration transducer, the travel-time of the mechanical vibration that then benchmark vibration transducer sends, the mistiming in the travel-time of the mechanical oscillation signal that each vibration transducer 11 adjacent with this benchmark vibration transducer sends, determine the concrete abort situation of combined electrical apparatus.Rough diagnosis compared to existing technology, the realizing of the diagnosis system of combined electrical apparatus localization of fault provided by the invention the accurate location to combined electrical apparatus.
Secondly, collection of the present invention be mechanical oscillation signal, thereby avoided on-the-spot electromagnetism, involve sound wave undesired signal, thereby guaranteed the safety of testing crew and equipment.
Again, diagnostic device provided by the invention is not changing on the basis of original wiring and the method for operation, has advantages of that installation is simple, easy to operate.
Finally, the present invention sends to by wireless transmission the mechanical oscillation signal measuring the background system (being main frame 14) of safety zone, thereby realized the isolation completely of high-pressure system and positioning system, and make testing crew away from high-voltage power supply, guaranteed the safety of testing crew and equipment.
It should be noted that, the present invention can also determine the fault type of combined electrical apparatus.
Concrete, the signal graph of the mechanical oscillation signal that main frame 14 sends benchmark vibration transducer, mates with the standard spectrogram in the vibration signal spectrogram storehouse of the combined electrical apparatus different faults type of pre-stored, thereby obtains the current fault type of combined electrical apparatus.
Wherein, the signal graph object of the mechanical oscillation signal that employing benchmark vibration transducer sends is to obtain optimum image matching effect, certainly, also can adopt the image of the mechanical oscillation signal of benchmark vibration transducer vibration transducer transmission in addition to mate.
Utilize images match to obtain the detailed process of the current fault type of combined electrical apparatus as follows:
Standard spectrogram in signal graph to be identified and vibration signal spectrogram storehouse is carried out to correlation calculations one by one, with the electric discharge type of the standard spectrogram of the described signal graph correlativity maximum to be identified electric discharge type that is described signal graph to be identified.
The image function of setting signal graph to be identified is the image function of standard spectrogram is the two relevance function NCorr, referring to formula (3):
Wherein, the average of inquery image pixel, be function after normalization; the average of reference picture pixel, be function after normalization.
The relevance values calculating according to relevance function just can judge the similarity degree of two width images, thereby electric discharge type is differentiated.
The electric discharge type that the discharge breakdown type of the standard spectrogram of correlativity maximum is described signal graph to be identified, thus also can determine insulation breakdown defect type.
When carrying out on-site data gathering, due to reasons such as undesired signal, measuring error, puncture and in vibration signal amplitude, there will be the data that deviation is larger.By described signal amplitude, be normalized and reduce the impact of described deviation larger data on test result.
Normalization computing method are as follows:
According to vibration signal number of times and amplitude, calculate respectively the mean value of vibration signal amplitude with variance S 2respectively referring to formula (4) and formula (5):
V ‾ = 1 n Σ i = 1 n V i - - - ( 4 )
S 2 = 1 n Σ i = 1 n ( V i - V ‾ ) 2 - - - ( 5 )
Wherein, V ifor vibration signal amplitude, the vibratory impulse signal number of times of n for measuring, i is positive integer.
According to the mean value of vibration signal amplitude with variance S 2calculate the standardization electric discharge amplitude of each vibration signal amplitude.
First, calculate the first standard value V corresponding to electric discharge amplitude of each vibration signal i', referring to formula (6):
V i ′ = V i - V ‾ S - - - ( 6 )
The first standard value obtaining like this, not necessarily in [0,1] interval, for making data in [0,1], adopts extreme difference standardization formula to obtain the second standard value V i", referring to formula (7):
V i ′ ′ = V i ′ - V min ′ V max ′ - V min ′ - - - ( 7 )
Described the second standard value V i" be V iin [0,1] interval standardization vibration signal amplitude.
It should be noted that, main frame 14 can also send the steering order that vibration transducer 11 parameters arrange to signal and communication device 13, thereby signal and communication device 13 is transmitted to signal projector 12 by this steering order, make signal projector 12 carry out corresponding operation according to steering order.
Preferably, vibration transducer 11 is connected by signal wire with signal projector 12, and the length of this signal wire is generally 1m~2m.
Referring to Fig. 3, the structural representation of the disclosed a kind of signal projector of the embodiment of the present invention, comprises signal amplification circuit 121, signal filter circuit 122, digital signal processor 123 and antenna 124;
Wherein:
Signal amplification circuit 121 is for amplifying the mechanical oscillation signal receiving;
Signal filter circuit 122 is connected with signal amplification circuit 121, and signal filter circuit 122 carries out filtering for the mechanical oscillation signal to after amplifying;
Digital signal processor 123 is connected with signal filter circuit 122, and digital signal processor 123 is for carrying out analog to digital conversion to filtered mechanical oscillation signal;
Antenna 124 is connected with digital signal processor 123, and antenna 124 is for sending the mechanical oscillation signal after analog to digital conversion.
Wherein, digital signal processor 123 is connected with antenna 124 by serial communication interface 125.
Can find out, signal projector 12 has been realized the wireless communication mode of diagnostic system, thereby has avoided the laying of signal wire, makes the use of diagnostic system more convenient.
For further optimizing above-described embodiment, also comprise: the data buffer 126 being connected with digital signal processor 123, the data that data buffer 126 is processed for temporary storage digital signal processor 123.
The deadlock phenomenon that the strong-electromagnetic field producing when preventing combined electrical apparatus breakdown fault causes order circuit, the present invention is placed in shielding box 127 earthing of casing of shielding box 127 by signal projector 12 (being signal amplification circuit 121, signal filter circuit 122, digital signal processor 123, data buffer 126 and serial communication interface 125).
Wherein, antenna 124 is placed in shielding box 127 outsides.
Signal projector 12 is charging inlet in addition, and signal projector 12 can adopt powered battery, preferentially selects lithium battery power supply, thereby can avoid the laying to power lead.
Referring to Fig. 4, the structural representation of the disclosed a kind of signal and communication device of the embodiment of the present invention, comprises antenna 131 and the serial communication interface 132 being connected with antenna 131.
Signal and communication device 13 is for coordinating mechanical oscillation signal transfer and wireless telecommunications.The Monitoring Data that signal and communication device 13 sends for receiving signal projector 12 on the one hand, and send to main frame 14; The control signal (information such as setting parameter to vibration transducer 11) on the other hand main frame 14 being sent sends to signal projector 12, thereby makes signal projector 12 according to corresponding control signal work.
Signal and communication device 13 is provided with USB (Universal Serial Bus, USB (universal serial bus)) interface, and signal and communication device 13 is connected with main frame 14 by this USB interface.
Signal and communication device 13 is charging inlet in addition, and signal and communication device 13 is connected with external power supply by this charging inlet.
It should be noted that, diagnostic system disclosed by the invention can also comprise: the display being connected with main frame 14, shows each mechanical oscillation signal by this display.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (12)

1. a diagnostic system for combined electrical apparatus localization of fault, is characterized in that, comprising:
A plurality of vibration transducers, described in each, vibration transducer is all fixed on the housing of combined electrical apparatus, the mechanical oscillation signal when gathering described combined electrical apparatus fault;
Signal projector with quantity such as described vibration transducers, described in each, signal projector is connected with a described vibration transducer, described signal projector is for obtaining the mechanical oscillation signal of the described vibration transducer output being connected with this signal projector, and to described mechanical oscillation signal amplify, transmission after filtering, analog to digital conversion;
The signal and communication device being all connected with signal projector described in each, described signal and communication device is for receiving the mechanical oscillation signal that signal projector sends described in each, and forwards this mechanical oscillation signal;
The main frame being connected with described signal and communication device, each mechanical oscillation signal that described main frame forwards for obtaining described signal and communication device, and from described each mechanical oscillation signal, find vibration signal amplitude large, or vibration signal duration of pulse width is large, or short mechanical oscillation signal of vibration signal travel-time, and using the vibration transducer that produces this mechanical oscillation signal as benchmark vibration transducer, the travel-time of the mechanical oscillation signal sending according to described benchmark vibration transducer, the time difference in the travel-time of the mechanical oscillation signal that each vibration transducer adjacent with described benchmark vibration transducer sends is determined the concrete abort situation of described combined electrical apparatus.
2. diagnostic system according to claim 1, it is characterized in that, described main frame is also for the signal graph of mechanical oscillation signal that described benchmark vibration transducer is sent, mate with the standard spectrogram in the vibration signal spectrogram storehouse of the described combined electrical apparatus different faults type of pre-stored, obtain the current fault type of described combined electrical apparatus.
3. diagnostic system according to claim 1, is characterized in that, described main frame is also for sending to described signal and communication device the steering order that vibration transducer parameter arranges.
4. diagnostic system according to claim 1, is characterized in that, described vibration transducer is connected by signal wire with described signal projector.
5. diagnostic system according to claim 1, is characterized in that, described signal projector comprises: signal amplification circuit, signal filter circuit, digital signal processor and antenna;
Described signal amplification circuit is for amplifying the mechanical oscillation signal receiving;
Described signal filter circuit is connected with described signal amplification circuit, and described signal filter circuit carries out filtering for the mechanical oscillation signal to after amplifying;
Described digital signal processor is connected with described signal filter circuit, and described digital signal processor is for carrying out analog to digital conversion to filtered mechanical oscillation signal;
Described antenna is connected with described digital signal processor, and described antenna is for sending the mechanical oscillation signal after analog to digital conversion.
6. diagnostic system according to claim 5, is characterized in that, described digital signal processor is connected with described antenna by serial communication interface.
7. diagnostic system according to claim 6, is characterized in that, also comprises the data buffer being connected with described digital signal processor.
8. diagnostic system according to claim 7, is characterized in that, described signal amplification circuit, described signal filter circuit, described digital signal processor, described data buffer and described serial communication interface are all arranged in shielding box.
9. diagnostic system according to claim 1, is characterized in that, the power supply of described signal projector is battery.
10. diagnostic system according to claim 1, is characterized in that, described signal and communication device comprises: antenna and the serial communication interface being connected with described antenna.
11. diagnostic systems according to claim 1, is characterized in that, described signal and communication device is provided with general-purpose serial bus USB interface, and described signal and communication device is connected with described main frame by described USB interface.
12. diagnostic systems according to claim 1, is characterized in that, also comprise: display;
Described display is connected with described main frame, for showing each mechanical oscillation signal.
CN201410279660.8A 2014-06-20 2014-06-20 Diagnostic system for composite apparatus fault positioning CN104020403A (en)

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CN110261711A (en) * 2019-08-06 2019-09-20 广东电网有限责任公司 A kind of faulty insulator localization method of GIS multiple-factor joint degradation platform

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Application publication date: 20140903