CN201716368U - Device for analyzing and identifying phase of cable - Google Patents
Device for analyzing and identifying phase of cable Download PDFInfo
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- CN201716368U CN201716368U CN2009201586908U CN200920158690U CN201716368U CN 201716368 U CN201716368 U CN 201716368U CN 2009201586908 U CN2009201586908 U CN 2009201586908U CN 200920158690 U CN200920158690 U CN 200920158690U CN 201716368 U CN201716368 U CN 201716368U
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Abstract
The utility model relates to a device for analyzing and identifying the phase of a cable. A signal acquiring device is used for acquiring a sampling signal of a cable to be detected; a time service device is used for adding a time impulse signal into a sample signal acquired by the signal acquiring device; a signal amplifying device is used for filtering and amplifying the sampling signal acquired by the signal acquiring device; and a signal zero-crossing and phase-discriminating device and a comparing device are used for processing the signal by means of zero cross and phase discrimination, so that the signal can be timely overturned in the comparing device at the practical zero-passing point; an MCU processing device is used for inputting the overturned signal into the MCU processing device to process, computing the time difference of the peak value of a receiving signal relative to a time signal, and converting the time difference into the phase difference; a judging device is used for comparing according to the phase difference and the reference phase difference and judging the type of the cable to be detected; and a display device is used for outputting a judging result to the display device to display, detecting the phase of the cable, and judging whether the cable is the target cable.
Description
One, technical field
The present technique invention belongs to the electric power detection range, and it relates to a kind of phase measurement, recognition device that is specifically designed to the single core operation of high pressure (more than the 35kV) cable.
Two, background technology
The high-tension cable phase-detection instrument that provides in the market; the direct-connected methods (as homemade high pressure nuclear phase instrument HXQ-Y) that adopt more; taking under the condition of insulation protection; the signals collecting end directly is connected with transfer wire and forms and detect the loop; gather this current signal and carry out phase calculation, thereby judge the phasing degree.This method measurement accurately is widely used, but is only applicable to the phase identification of aerial bare line, then can't judge underground cable.
In China's urban distribution network is built, the built on stilts mode that has become extensive employing into the ground cable that changes into of power transmission line route, because the continuous increase of power capacity demand, the electric pressure of going into the ground cable is also improving constantly, be not only the distribution network of 10kV electric pressure, the major network cable of present 35kV, 110kV grade is also laid in a large number with going into, and because function that major network is born and effect are more huger than distribution (10kV), higher to the accuracy and the integrality requirement of its basic data.
Because in the underground cable work progress, construction lack of standardization, acceptance method is single and lack effective technical means, does not all hang the Sign Board even the mistake of simply listing on a lot of cables.Some cable has been because the laying time is very long, and also the handwriting is blurred for the top sign board that hangs, come off, lose, or and in actual electric power overhaul work progress, the cable in the cable passage is very many, the identification of cable is just seemed still be important.If can't grasp real cable information, not only can't realize effective management, and in construction such as maintenance, repairing, adopt the power failure method of testing that to the life of power consumer, produce and bring influence, also there are many dangerous factors in time and effort consuming not only.
Detection identification at 35KV grade and above underground high voltage cable, because its construction of cable skin is armouring and sheath, can't adopt direct-connected method to carry out phase-detection, and such cable adopts single cored structure substantially, strength of current is big, when injecting and detect, signal occurs easily being submerged, phenomenons such as magnetic saturation, and must meet cable one end armouring ground connection in the power grid construction of this electric pressure, the earth-free safe operation of other end armouring requires (as Fig. 4), routine is used for the signal coupling injection method of cable measurement because can not form effective detection loop causes losing efficacy, and can't fundamentally solve the problem of signal injection in cable detection and the identification.We understand at present now except marking the identification when the cabling, also not having effective technical means and way that this grade operation cable that has laid is accurately discerned with phase place judges, for this reason, the utility model technology provides a kind of brand-new, rapid, feasible, safe pick-up unit, can in operational process, accuracy judge the phase place of any section position single core cable, thereby reach effective identification single core cable.
Three, utility model content
Technical problem to be solved in the utility model provides a kind of specially at the cable identification of the single core operation of high pressure (35kV and more than) cable and the pick-up unit of phase measurement.A kind of pick-up unit that carries out the cable under test signature analysis at a distance wherein also is provided especially, be specifically designed to the single core operation of high pressure to be measured (35kV and more than) cable is carried out cable identification and phase-detection, use this device to carry out the phase of cable data acquisition and carry out initialization definitions by non-contacting acquisition mode, form the benchmark value at known single core cable work phase bit position; Thereafter can be at any time in target cable position that needs detect equally by this device to single core cable under test collecting work electric current, phase data, thereby and the signal that the received normal data by A/D conversion, amplification, compensation, processings back such as synchronous and benchmark single core cable compared with definite its type feature analysis judge the phase place of cable under test and whether be target cable.
It is a kind of specially at the cable identification of the single core operation of high pressure (35kV and more than) cable and the detection method and the device thereof of phase measurement that the utility model provides, this device is also referred to as phase of cable and analyzes identifier, can be under situation about not having a power failure, working current, the phase place of operation cable are measured, and, cable is carried out the accurate identification of track inspection and target cable according to its eigenwert.
Concrete scheme, the utility model provides a kind of phase of cable to analyze recognition device, gather the sampled signal of cable under test by signal pickup assembly, time service device is given joining day pulse signal in the sampled signal that signal pickup assembly gathers, signal amplifying apparatus carries out filtering to the sampled signal that signal pickup assembly is gathered, processing and amplifying, through signal zero passage phase discrimination processing device and comparison means signal is carried out the zero passage phase discrimination processing, it can in time be overturn in comparer at the zero crossing of reality, by the MCU treating apparatus energizing signal being imported the MCU processor handles, calculate the mistiming of received signal peak value with respect to time signal, be scaled phase differential, decision maker compares according to described phase differential and reference phase difference, judge the type of cable under test, display device exports result of determination to display device and shows.
According to another goal of the invention of the present utility model, further, the time pulse signal of device adding is the PPS synchronization pulse during being subjected to described in this device.
According to another goal of the invention of the present utility model, further, zero passage phase discrimination processing described in this device comprises unidirectional zero passage phase discrimination processing and/or two-way zero-crossing phase discrimination processing.
According to another goal of the invention of the present utility model, further, display device described in this device is the LCD display device.
Another goal of the invention of the present utility model, the utility model provides a kind of method for analyzing and recognizing phase of cable, comprises the steps:
The signals collecting step is carried out signals collecting to cable under test;
The time service step, joining day signal in the sampled signal of being gathered;
The signal amplification procedure carries out filtering, processing and amplifying to the sample signal of being gathered;
Signal zero passage phase discrimination processing step and comparison step are carried out the zero passage phase discrimination processing to signal, so that it can be in zero crossing upset in time in comparer of reality;
The MCU treatment step is imported the MCU processor with energizing signal and is handled, and calculates the mistiming of received signal peak value with respect to time signal, is scaled phase differential;
Determination step compares according to described phase differential and reference phase difference, judges the type of cable under test;
Step display exports result of determination to display device and shows.
According to another goal of the invention of the present utility model, further, time signal described in this method is the PPS synchronization pulse.
According to another goal of the invention of the present utility model, further, zero passage phase discrimination processing described in this method comprises unidirectional zero passage phase discrimination processing and/or two-way zero-crossing phase discrimination processing.
According to another goal of the invention of the present utility model, further, display device described in this method is the LCD display device.
Compared with the prior art, the utility model has the advantages that:
Existingly with non-excavation form underground cable is sought equipment that track detects and all be based on electromagnetic induction principle and measure judgement, if the cable under test loop resistance is excessive, damaged such as ground connection, imperfect earth, cable is aging, the protective layer breakage, factors such as joint makes moist, the capital causes signal excessive attenuation even no signal, not clear even mistake will appear judging in measurement result, and existing checkout equipment does not possess the working condition judgement, the testing staff merely with final signal as beasurement base, have very big uncertainty, can't accurately judge target cable.The utility model adopts phase of cable analysis identification, can be in the arbitrfary point to the single core object run cable of high pressure (35kV and more than) carry out accurately, identification fast and effectively, not only overcome the technical matters in cable maintenance, the repair procedures, reduction is to the power failure influence of power consumer, solve detection means that power department fails effectively to solve for many years, existing and method and also had an open defect and a not enough objective difficult problem, for electric power underground cable generaI investigation, track location, trouble spot search judgement fast, provide effectively, guaranteed reliably; Improved managerial ability and the effect of power department greatly, will produce the huge social benefit this grade underground cable.
Four, description of drawings
Below by drawings and Examples the utility model is described further:
Fig. 1 is a unidirectional zero passage phase demodulation technical schematic diagram of the present utility model;
Fig. 2 is a unidirectional zero passage phase demodulation technology oscillogram of the present utility model;
Fig. 3 is positive and negative imbalance pulse theory figure of the present utility model;
Fig. 4 is the live simulation drawing of work of the present utility model;
Fig. 5 is the principle of work and the process flow diagram of the utility model detection method;
Fig. 6 is a two-way zero-crossing phase demodulation technical work schematic diagram of the present utility model;
Fig. 7 is the main structure chart of recognition device of the present utility model;
Fig. 8 is a cut-away view of the present utility model.
Five, embodiment
Referring to Fig. 4, we also provide the phase measurement of the single core operation of a kind of high pressure (35kV and more than) cable, the pick-up unit of cable identification is that phase of cable is analyzed identifier, and this instrument is by power module, current signal collecting unit, signal arrangement unit, signal conversion unit, time service unit, phase place define storage units, central processing and phase comparison unit, output and display unit are formed synchronously; Its workflow and principles illustrated are as shown in Figure 4.
In real work, we can carry out phase identification accurately by above method to the high voltage single-core cable of three phase supply, the live simulation drawing of working is seen Fig. 5, what wherein the instrument of the different sections of A phase cable represented that any forward peak value sampling meets 0 phase characteristic is judged as the A phase, any forward peak value sampling meets 0 phase place+120 degree and is the B phase, any forward peak value sampling meets 0 phase place-120 degree and is the C phase, consider the factors such as calculating time-delay of signals collecting, our specification error scope is that-5 degree are to+5 degree.Through actual measurement, the setting of this error range can guarantee the accuracy measured.
Referring to Fig. 5, the method for the phase of cable analysis identification that the utility model provides is specific as follows:
The setting of benchmark value (being also referred to as the phase place initialization definitions): the instrument that we design directly is locked in target the frequency of operation of electric power transfer, in China, frequency of operation is 50Hz, inductive coupling mode by the collecting unit current clamp, at first with known phase (if A phase, we can measure setting at the outlet interval of transformer station) the working current waveform of operation on the cable take out, through 50HZ filtering, noise reduction, arrangement is amplified, analog to digital conversion, obtain complete 50HZ standard sine wave waveform, getting the forward wave peak position then in its acquisition time section carries out accurate time service and calculates its phase value (including but not limited to GPS location Service of Timing, China's the Big Dipper location Service of Timing, the wireless Service of Timing of RCT, atomic clock or crystal oscillator time service), this phase place of original definition is 0 (A) phase place and storage memory.According to China's power grid construction technical regulation, the phase place of other cables necessarily differs with this ± 120 degree (2/3 π), be respectively B mutually and C mutually, the cut cable of known phase measure respectively B mutually and C mutually phase characteristic and carry out original definition and store and remember; So far, finish phase of cable initialization definitions and form follow-up measurement reference value relatively.
Locking phase compares: by above-mentioned working routine and method, the testing staff can carry out phase of cable at any time to the optional position of target cable with same instrument and measure after finishing initialization definitions.Though the testing staff is the signals collecting time of control survey point accurately, and the uncertain signal shortage comparability that just directly causes of acquisition time, can't realize the comparison of phase place; So we finish by accurate Service of Timing cooperating program.The frequency of operation of China's electrical network is standard 50HZ, promptly then finished the phase waveform of a standard every 0.02 second, because the simultaneous techniques of whole electrical network also is to adopt synchronous time service, according to noted earlier, the reference point collection is 0 phase place (an A phase), 0.02 second Integer n times time point collection sampling after this benchmark acquisition time point is (if the forward time to peak is t1 when initialization definitions is measured, then arbitrfary point measurement time t 2 must satisfy t2=t1+0.02S*N, N counts arbitrarily, the phase measurement that only meets this time conditions just possesses comparability, its sampling time was satisfied above-mentioned condition when we guaranteed that by predefined built-in working routine the arbitrfary point is measured, this is a key issue of the present utility model), its sample waveform still is the signal positive peak, and phase place is also constant, still 0 phase place; The A phase character parameter of this parameter and storage is compared, and is the A phase with identical consistent this target cable of can judging of initialization definitions A phase character.
The rest may be inferred, any section to B mutually and C mutually cable measure at cable and also meet this feature (this calls relative method), the B phase character is identical during with initialization be B mutually; The C phase character coincide during with initialization be C mutually.
Around this principle, at the optional position of this cable sampling and measuring,, solved single core cable phase identification problem by just can discern the phase place of this phase cable to the positive peak sampling of regulation sampling time; Judge further whether just can tell is target cable.
In implementation procedure, measure the accuracy of judging for improving, get rid of us and also adopt the two-way phase demodulation technology of distinguishing to some extent with conventional unidirectional zero passage phase demodulation, specify as follows:
The defective of unidirectional zero passage phase demodulation: the principle of unidirectional zero passage phase demodulation is two frequency sinusoidal signal A and B together, after the process comparer is crossed zero balancing and shaping, export two dutycycles and be 50% square-wave pulse PA and PB, PA and PB obtain Φ AB by a phase discriminator, we claim that Φ AB is the phase differential of signal A and signal B, referring to Fig. 1, Fig. 2.
But the actual really not so ideal of situation owing to lacked of proper care and warm influence of floating, will can not in time overturn comparer at the zero crossing of reality.When just lacking of proper care, comparer output duty of ratio is less than 50%, and during negative the imbalance, comparer output duty of ratio is greater than 50%.Thus,, all will bring error, the accuracy that influence is judged to phase measurement no matter we are with positive going zeror crossing phase demodulation or negative sense zero passage phase demodulation.Unless two comparison passages have identical imbalance polarity and identical misalignment rate, and this is a kind of unpractical ideal state, referring to Fig. 3.
About the principle and the realization of two-way zero-crossing phase demodulation, its basic functional principle as shown in Figure 6.Cause that we carry out phase demodulation after two imbalance square-wave pulses can being modified to ideal square wave more so since error has departed from 50% dutycycle by zero-crossing pulse, perhaps the mistiming with two square-wave pulse central points of measurement draws phase differential.The simplest method is that the result to the result of forward zero passage phase demodulation and negative sense zero passage phase demodulation gets average, this average as desired identified result.This is to have used the forward and reverse method of offset of the systematic error in the metrology, measures the accuracy of judging with effectively improving; We are referred to as two-way zero-crossing phase demodulation technology.Here adopted the mistiming of measuring two square-wave pulse central points.
The main composition that phase of cable that the utility model provides is analyzed identifier as shown in Figure 7, its inner structure and schematic diagram are as shown in Figure 8.
Use by above-mentioned technology and equipment, we can be in the arbitrfary point to the single core object run cable of high pressure (35kV and more than) carry out accurately, identification fast and effectively, not only overcome the technical matters in cable maintenance, the repair procedures, reduction is to the power failure influence of power consumer, solve detection means that power department fails effectively to solve for many years, existing and method and also had an open defect and a not enough objective difficult problem, for electric power underground cable generaI investigation, track location, trouble spot search judgement fast, provide effectively, guaranteed reliably; Improved managerial ability and the effect of power department greatly, will produce the huge social benefit this grade underground cable.
The utility model is not limited only to the embodiment that clearly describes at this.Though previous description and accompanying drawing have been described preferred embodiment of the present utility model, be understood that under the situation that does not break away from spirit of the present utility model, this can produce various additional, revise and replace.It will be apparent to those of skill in the art that under the situation that does not break away from spirit of the present utility model or intrinsic propesties, can and utilize other elements, material and parts to realize the utility model with other special shapes, structure, layout, ratio.Those skilled in the art will recognize: the utility model can use the structure, layout, ratio, material and the parts that use in the invention reality and other many modifications, and these are modified in and are adapted to particular surroundings and operational requirements under the situation that does not break away from principle of the present utility model especially.Therefore, current disclosed embodiment should be understood that illustrative but not to the restriction of its scope of asking for protection in all respects.
Claims (2)
1. a phase of cable is analyzed recognition device, it is characterized in that:
Gather the sampled signal of cable under test by signal pickup assembly, time service device is given joining day pulse signal in the sampled signal that signal pickup assembly gathers, signal amplifying apparatus carries out filtering to the sampled signal that signal pickup assembly is gathered, processing and amplifying, through signal zero passage phase discrimination processing device and comparison means signal is carried out the zero passage phase discrimination processing, it can in time be overturn in comparer at the zero crossing of reality, by the MCU treating apparatus energizing signal being imported the MCU processor handles, calculate the mistiming of received signal peak value with respect to time signal, be scaled phase differential, decision maker compares according to described phase differential and reference phase difference, judge the type of cable under test, display device exports result of determination to display device and shows.
2. phase of cable according to claim 1 is analyzed recognition device, and it is characterized in that: described display device is the LCD display device.
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|---|---|---|---|
| CN2009201586908U CN201716368U (en) | 2009-06-11 | 2009-06-11 | Device for analyzing and identifying phase of cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201586908U CN201716368U (en) | 2009-06-11 | 2009-06-11 | Device for analyzing and identifying phase of cable |
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| CN201716368U true CN201716368U (en) | 2011-01-19 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768311A (en) * | 2012-08-06 | 2012-11-07 | 杭州讯能科技有限公司 | Method and device for recognizing phase of power line |
| CN102955099A (en) * | 2012-11-12 | 2013-03-06 | 江苏省电力公司无锡供电公司 | Testing method for high-voltage cable identification and device thereof |
| CN103063934A (en) * | 2012-12-31 | 2013-04-24 | 国家电网公司 | Three-phase voltage phase distinguishing method |
| CN105182078A (en) * | 2015-10-08 | 2015-12-23 | 常兴 | High voltage phasing tester on-line monitoring system and working method |
| CN105762715A (en) * | 2016-04-23 | 2016-07-13 | 安徽意力电缆有限公司 | Cable wellhead pulley based on radio frequency tag |
| CN108318737A (en) * | 2018-01-22 | 2018-07-24 | 西安工业大学 | A kind of high accuracy number phase detecting method |
| CN110244139A (en) * | 2019-06-28 | 2019-09-17 | 国网山东省电力公司临沂供电公司 | Remote high-voltage nuclear phase instrument based on GPRS |
-
2009
- 2009-06-11 CN CN2009201586908U patent/CN201716368U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768311A (en) * | 2012-08-06 | 2012-11-07 | 杭州讯能科技有限公司 | Method and device for recognizing phase of power line |
| CN102768311B (en) * | 2012-08-06 | 2014-10-29 | 杭州讯能科技有限公司 | Method and device for recognizing phase of power line |
| CN102955099A (en) * | 2012-11-12 | 2013-03-06 | 江苏省电力公司无锡供电公司 | Testing method for high-voltage cable identification and device thereof |
| CN103063934A (en) * | 2012-12-31 | 2013-04-24 | 国家电网公司 | Three-phase voltage phase distinguishing method |
| CN103063934B (en) * | 2012-12-31 | 2017-02-08 | 国家电网公司 | Three-phase voltage phase distinguishing method |
| CN105182078A (en) * | 2015-10-08 | 2015-12-23 | 常兴 | High voltage phasing tester on-line monitoring system and working method |
| CN105182078B (en) * | 2015-10-08 | 2017-12-26 | 常兴 | High voltage phasing tester on-line monitoring system and its method of work |
| CN105762715A (en) * | 2016-04-23 | 2016-07-13 | 安徽意力电缆有限公司 | Cable wellhead pulley based on radio frequency tag |
| CN108318737A (en) * | 2018-01-22 | 2018-07-24 | 西安工业大学 | A kind of high accuracy number phase detecting method |
| CN110244139A (en) * | 2019-06-28 | 2019-09-17 | 国网山东省电力公司临沂供电公司 | Remote high-voltage nuclear phase instrument based on GPRS |
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Legal Events
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| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: JIA XIAOGANG ZHU LIQIN Owner name: ZHEJIANG TUWEI ELECTRIC POWER SCIENCE + TECHNOLOGY Free format text: FORMER OWNER: YAN HAILIN Effective date: 20110324 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 311203 NO. 302, UNIT 2, BUILDING 3, NO. 1058, XIAOSHAO ROAD, XIAOSHAN DISTRICT, HANGZHOU CITY, ZHEJIANG PROVINCE TO: 310012 4/F, NO. 20, XIDOUMEN ROAD, WEST LAKE DISTRICT, HANGZHOU CITY, ZHEJIANG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110324 Address after: 4, Hangzhou, Zhejiang Province, Xihu District West Road, No. 310012, building 20 Patentee after: Zhejiang Tuwei Power Technology Co., Ltd. Address before: Xiaoshan District of Hangzhou City, Zhejiang province 311203 Xiaoshao Road No. 1058 building 3, unit 2, No. 302 Co-patentee before: Jia Xiaogang Patentee before: Yan Hailin Co-patentee before: Zhu Liqin |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110119 |