CN203149076U - Itinerant ant detector for partial discharge by switch cabinet - Google Patents
Itinerant ant detector for partial discharge by switch cabinet Download PDFInfo
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- CN203149076U CN203149076U CN 201320147187 CN201320147187U CN203149076U CN 203149076 U CN203149076 U CN 203149076U CN 201320147187 CN201320147187 CN 201320147187 CN 201320147187 U CN201320147187 U CN 201320147187U CN 203149076 U CN203149076 U CN 203149076U
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- signal
- shelf depreciation
- data collecting
- collecting card
- switch cubicle
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Abstract
This utility model discloses an itinerant detector for partial discharge by a switch cabinet, which comprises an ultrahigh frequency sensor, a cable and a detection terminal. The ultrahigh frequency sensor is connected with the detection terminal; the detection terminal comprises a signal modulation unit, a data acquisition card and a touch screen; the signal modulation unit comprises a band-pass filter, a signal amplification device and a pulse stretcher; and the band-pass filter, the signal amplification device, the pulse stretcher and the touch screen are connected in sequential order. The Itinerant detector for partial discharge by the cabinet has advantages that structure is compact, that the handheld type detection terminal makes carrying and detection convenient, that efficiency is high and that a ultrahigh frequency detection method can effectively detect the partial discharge of the switch cabinet on the spot.
Description
Technical field
The utility model relates to a kind of pick-up unit for the switch cubicle Partial Discharge Detection, specifically is a kind of switch cubicle shelf depreciation logging.
Background technology
Along with advancing by leaps and bounds of China's power industry construction, modern power systems just develops towards big electrical network, big unit, UHV (ultra-high voltage), jumbo direction, for ensureing stability, the reliability of electric system, the safe coefficient of power equipment is also had higher requirement.Switch cubicle is visual plant commonly used in the electric system, the switch cubicle internal fault is based on the insulativity fault, when existing insulation defect, switch cubicle inside can produce shelf depreciation, it is one of important parameter of reflection switch cubicle insulating property that shelf depreciation is put, it is sign and the form of expression of switch cubicle insulation degradation, is again the reason of the further deterioration of insulation.Can find the insulation defect that it is inner early stage by detector switch cabinet shelf depreciation, in order to take measures, avoid its development, it is significant to the safe and stable operation of guaranteeing switch cubicle effectively to detect shelf depreciation.
In the detection method of the inner local discharge signal of switchgear, the ultrahigh frequency method is to realize the practical feasible method of switchgear partial discharge monitoring at present at present.The ultrahigh frequency method is to utilize sensor to receive local discharge excited uhf electromagnetic wave signal to monitor shelf depreciation.Compare with additive method, the ultrahigh frequency method has that sensitivity is higher, antijamming capability is strong, can identify fault type and advantage such as position, and is one of research focus over nearly 20 years.
Analyze present high-frequency local discharging checkout equipment, from the home market, most of Partial discharge detector can only extract a small amount of effectively signal from abundant local discharge signal, product mostly is fixed, and volume is bigger, and structure is comparatively complicated, and is portable poor.On the present market, high-end Portable PD On-Line detector is monopolized by some external traditional manufacturers of Partial discharge detector, expensive, being difficult to fund for some medium and small sized enterprises goes to buy, and domestic some Portable PD On-Line detector functions of studying are also not too perfect, therefore it is cheap relatively to develop a kind of cost, can eliminate various interference in the testing process, and local discharge signal intensity is made differentiation, have the hand-held tester of good portability simultaneously, also be necessary.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art and a kind of switch cubicle shelf depreciation logging is provided, the ultrahigh frequency office discharge signal that can produce switch cubicle at the scene effectively detects, cost is cheap relatively, compact conformation, carry easy to detect, high efficiency makes things convenient for the staff to carry out daily patrolling and examining.
The technical scheme that realizes above-mentioned purpose is:
A kind of switch cubicle shelf depreciation logging, comprise uhf sensor, cable and sense terminals, described uhf sensor links to each other with described sense terminals by described cable, described sense terminals comprises signal condition unit, data collecting card and touch-screen, described signal condition unit comprises bandpass filter, signal amplifier and pulse stretcher, described bandpass filter, signal amplifier, pulse stretcher, data collecting card and touch-screen link to each other successively, wherein:
The signal that produces during described uhf sensor receiving key cabinet shelf depreciation, and by described cable signal is delivered to described bandpass filter;
The target signal filter noise of described bandpass filter to receiving, and the signal after the filtering interfering sent to described signal amplifier;
The signal of described signal amplifier after to the filtering interfering that receives amplifies processing, and being delivered to described pulse stretcher through the signal that amplifies after handling;
The process that described pulse stretcher will receive is amplified the wide pulse signal that the signal broadening after handling becomes to have certain width and precision, and wide pulse signal is delivered to described data collecting card;
The wide pulse signal that described data acquisition card docking is received is stored, analyzing and processing, and the result is delivered to touch-screen;
Described touch-screen shows the testing result of shelf depreciation logging.
Above-mentioned switch cubicle shelf depreciation logging, wherein, described uhf sensor comprises a microstrip antenna, and the frequency band of described microstrip antenna is 500MHz to 1.5GHz, the ultra-high frequency signal that described uhf sensor produces during by described microstrip antenna receiving key cabinet shelf depreciation.
Above-mentioned switch cubicle shelf depreciation logging, wherein, the highest sample frequency of described data collecting card is 2KHz, the AD(analog to digital conversion of described data collecting card) resolution is 10bit.
Above-mentioned switch cubicle shelf depreciation logging, wherein, the input pattern signal of described data collecting card is the AC coupling input mode.
Switch cubicle shelf depreciation logging of the present utility model compared with prior art, the ultrahigh frequency office discharge signal that can produce switch cubicle at the scene effectively detects and analyzes, judge whether switch cubicle inside has office to put generation, and the power of the discharge signal of playing a game estimates that qualitatively cost is cheap relatively, compact conformation, sense terminals is hand-held, carries easy to detectly, has higher sensitivity and signal to noise ratio (S/N ratio), high efficiency makes things convenient for the staff to carry out daily patrolling and examining.
Description of drawings
Fig. 1 is principle schematic of the present utility model;
Fig. 2 is the on-the-spot schematic layout pattern that uses of the utility model;
Fig. 3 is the block diagram of the principle of work of sense terminals of the present utility model.
Embodiment
In order to make those skilled in the art can understand the technical solution of the utility model better, below in conjunction with accompanying drawing its embodiment is described in detail:
See also Fig. 1, pass of the present utility model cabinet shelf depreciation logging, comprise uhf sensor 1, cable 3 and sense terminals 2, uhf sensor 1 links to each other with sense terminals 2 by cable 3, sense terminals 2 comprises signal condition unit 21, data collecting card 22 and touch-screen 23, signal condition unit 21 comprises bandpass filter 211, signal amplifier 212 and pulse stretcher 213, and bandpass filter 211, signal amplifier 212, pulse stretcher 213, data collecting card 22 and touch-screen 23 link to each other successively.
The ultra-high frequency signal that uhf sensor 1 produces when being used for receiving key cabinet shelf depreciation; The signal that signal condition unit 21 is used for sensor is sent here carries out pre-service, realizes the signal of a certain centre frequency of the certain bandwidth of any gating hyper band.
The ultra-high frequency signal that produces during uhf sensor 1 receiving key cabinet shelf depreciation, and by cable 3 signal is delivered to bandpass filter 211; The target signal filter noise of 211 pairs of receptions of bandpass filter, and the signal after the filtering interfering sent to signal amplifier 212; Signal after the filtering interfering of 212 pairs of receptions of signal amplifier amplifies processing, and being delivered to pulse stretcher 213 through the signal that amplifies after handling; The process that pulse stretcher 213 will receive is amplified the wide pulse signal that the signal broadening after handling becomes to have certain width and precision, and wide pulse signal is delivered to data collecting card 22; The wide pulse signal of 22 pairs of receptions of data collecting card is stored, analyzing and processing, and the result is delivered to touch-screen 23; Touch-screen 23 shows the testing result of shelf depreciation logging, and can realize artificial input control order.
In the present embodiment, uhf sensor 1 comprises a microstrip antenna, and the frequency band of microstrip antenna is 500MHz to 1.5GHz, the ultra-high frequency signal that uhf sensor produces during by microstrip antenna receiving key cabinet shelf depreciation.The highest sample frequency of data collecting card 22 is 2KHz, and the AD resolution of data collecting card 22 is 10bit, and the input pattern signal of data collecting card 22 is the AC coupling input mode.
See also Fig. 2 again, at the scene in the measuring process, because the switch cubicle 10 in the master-control room is tight arrangements one by one, two sides generally can not placement sensor, so uhf sensor 1 generally can only place the front and back of switch cubicle 10.The ultra-high frequency signal that uhf sensor 1 produces when gathering the switch cubicle shelf depreciation, and by cable 3 signal is transferred to sense terminals 2.
See also Fig. 3 again, sense terminals 2 principle of work are as follows: 1) carry out initialization earlier, all kinds of initial parameters etc. are set; 2) after the signal of the signal of sense terminals and 50Hz keeps synchronously, produce the controlling of sampling clock again; The ultra-high frequency signal that produces when 3) specifying corresponding uhf sensor read switch cabinet shelf depreciation according to setup parameter again, and the data that collect are preserved; 4) use FIR(Finite Impulse Response, finite impulse response (FIR) then) filtering, FFT(fast Fourier transform, Fast Fourier Transform (FFT)) multiple filtering algorithms such as filtering, wavelet filtering, the much noise at filtering scene disturbs; 5) at last ultrahigh frequency office discharge signal is analyzed, judged whether that shelf depreciation takes place, the insulation status of assessment switch cubicle.
Switch cubicle shelf depreciation logging of the present utility model by lithium battery power supply, makes things convenient for the staff to carry out daily patrolling and examining.
In the present embodiment, uhf sensor, bandpass filter, signal amplifier, pulse stretcher, data collecting card adopt the common and model that is easy to purchase on the market, for example the model of bandpass filter is BPF-A60+, the model of signal amplifier is PMA-545+, and the model of data collecting card is USB-7660AN; Or with prior art design realization.
In sum, switch cubicle shelf depreciation logging of the present utility model, the ultrahigh frequency office discharge signal that can produce switch cubicle at the scene effectively detects and analyzes, and judges whether switch cubicle inside has office to put generation, and the power of the discharge signal of playing a game is estimated qualitatively, cost is cheap relatively, compact conformation, and sense terminals is hand-held, carry easy to detect, have higher sensitivity and signal to noise ratio (S/N ratio), high efficiency makes things convenient for the staff to carry out daily patrolling and examining.
Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.
Claims (4)
1. switch cubicle shelf depreciation logging, comprise uhf sensor, cable and sense terminals, described uhf sensor links to each other with described sense terminals by described cable, it is characterized in that, described sense terminals comprises signal condition unit, data collecting card and touch-screen, described signal condition unit comprises bandpass filter, signal amplifier and pulse stretcher, and described bandpass filter, signal amplifier, pulse stretcher, data collecting card and touch-screen link to each other successively, wherein:
The signal that produces during described uhf sensor receiving key cabinet shelf depreciation, and by described cable signal is delivered to described bandpass filter;
The target signal filter noise of described bandpass filter to receiving, and the signal after the filtering interfering sent to described signal amplifier;
The signal of described signal amplifier after to the filtering interfering that receives amplifies processing, and being delivered to described pulse stretcher through the signal that amplifies after handling;
The process that described pulse stretcher will receive is amplified the wide pulse signal that the signal broadening after handling becomes to have certain width and precision, and wide pulse signal is delivered to described data collecting card;
The wide pulse signal that described data acquisition card docking is received is stored, analyzing and processing, and the result is delivered to touch-screen;
Described touch-screen shows the testing result of shelf depreciation logging.
2. switch cubicle shelf depreciation logging according to claim 1, it is characterized in that, described uhf sensor comprises a microstrip antenna, the frequency band of described microstrip antenna is 500MHz to 1.5GHz, the ultra-high frequency signal that described uhf sensor produces during by described microstrip antenna receiving key cabinet shelf depreciation.
3. switch cubicle shelf depreciation logging according to claim 1 is characterized in that the highest sample frequency of described data collecting card is 2KHz, and the AD resolution of described data collecting card is 10bit.
4. according to claim 1 or 3 described switch cubicle shelf depreciation loggings, it is characterized in that the input pattern signal of described data collecting card is the AC coupling input mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320147187 CN203149076U (en) | 2013-03-28 | 2013-03-28 | Itinerant ant detector for partial discharge by switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320147187 CN203149076U (en) | 2013-03-28 | 2013-03-28 | Itinerant ant detector for partial discharge by switch cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN203149076U true CN203149076U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320147187 Expired - Lifetime CN203149076U (en) | 2013-03-28 | 2013-03-28 | Itinerant ant detector for partial discharge by switch cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197211A (en) * | 2013-03-28 | 2013-07-10 | 国家电网公司 | Switch cabinet partial discharge itinerant detector |
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2013
- 2013-03-28 CN CN 201320147187 patent/CN203149076U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197211A (en) * | 2013-03-28 | 2013-07-10 | 国家电网公司 | Switch cabinet partial discharge itinerant detector |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130821 |