CN201955430U - Cable partial discharge positioning system based on time domain reflection characteristics - Google Patents
Cable partial discharge positioning system based on time domain reflection characteristics Download PDFInfo
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- CN201955430U CN201955430U CN 201120047103 CN201120047103U CN201955430U CN 201955430 U CN201955430 U CN 201955430U CN 201120047103 CN201120047103 CN 201120047103 CN 201120047103 U CN201120047103 U CN 201120047103U CN 201955430 U CN201955430 U CN 201955430U
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- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000002310 reflectometry Methods 0.000 claims description 11
- 230000036039 immunity Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241000555268 Dendroides Species 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The utility model discloses a cable partial discharge positioning system based on time domain reflection characteristics. The cable partial discharge positioning system comprises a sampling module connected with a cable to be detected, wherein an output end of the sampling module is connected with an input end of an anti-jamming module; an output end of the anti-jamming module is connected with an input end of a data acquisition module; the data acquisition module is in two-way connection with a master controller; an output end of the master controller is connected with an upper computer; an output end of the data acquisition module is further connected with an input end of an oscilloscope; and an output end of the oscilloscope is connected with an input end of the master controller. Through the adoption of the cable partial discharge positioning system, the greater error caused by direct speed measurement can be avoided, the required wave shape can be detected conveniently, and the accurate discharge position can be obtained through calculation, thereby improving the result reliability and the efficiency of the partial discharge detection.
Description
Technical field
The utility model relates to a kind of cable local discharge positioning system based on the Time Domain Reflectometry characteristic.
Background technology
Both at home and abroad operating experience and achievement in research show: the early stage deterioration of power cable performance or depend on that the dendroid of its insulating medium is aging serviceable life to a great extent, and measurement of partial discharge is one of effective ways of quantitative test dendroid degradation.Power cable partial discharge quantity and its insulation status are closely related, so measurement of partial discharge is the key of cable insulation monitoring, the variation of partial discharge quantity is indicating that cable insulation necessarily exists the defective that may jeopardize cable running safety.
According to classical theory of travelling wave, power cable is regarded as coaxial configuration find the solution Wave Equations, can obtain parameters such as the characteristic impedance of cable and propagation constant.Propagation constant is relevant with signal frequency, and each frequency divides chain to propagate with separately speed and attenuation rate in the cable.High fdrequency component is faster than low frequency component decay, and along with signal is propagated along cable, office's discharge signal variation characteristic shows as that peak value of pulse reduces, the pulse width expansion.Put the source location the inside in office, the decay of pulse signal and velocity of propagation are crucial parameters.According to Theoretical Calculation and through actual verification, the velocity of propagation that pulse is put in the interior office of cable is generally 160～170m/ μ s.When detecting cable office and put, if can position Partial Discharge Sources, the actual effect measured of shelf depreciation activity will improve greatly so.
The purpose that cable carries out measurement of partial discharge at first is to understand the cable discharge scenario, with the insulating property in when operation after estimating; The secondth, if found unallowed discharge, then to find out the point of discharge position, the serious part of discharge more can be changed for operating cable like this, guarantee the line security operation.How to find out the shelf depreciation point fast be the major issue that we face in order to detect the fault of getting rid of cable and hidden danger more quickly and effectively in actual applications.
The utility model content
For remedying the deficiencies in the prior art, the utility model provides a kind of cable local discharge positioning system based on the Time Domain Reflectometry characteristic.
For achieving the above object, the utility model adopts following technical scheme:
Cable local discharge positioning system based on the Time Domain Reflectometry characteristic, it comprises the sampling module that is connected with detection streamer, the output terminal of sampling module is connected with the immunity module input end, the immunity module output terminal is connected with the data acquisition module input end, data acquisition module is connected with master controller is two-way, and the master controller output terminal is connected with host computer; Described data acquisition module output terminal also is connected with the oscillograph input end, and the oscillograph output terminal is connected with the master controller input end.
Described immunity module comprises integrating circuit, linear amplifier circuit and the filtering circuit that connects successively.
Described sampling module is PCI four road pulse signal acquisition cards.
Described data acquisition unit adopts the PCI5112 data collecting card.
The TMS32C6713BPYP that described master controller is produced for TI company.
Principle: this novel time domain reflectometry (TDR) office of location that adopted puts, as shown in Figure 1 sensor is linked cable one end of length L, the distance that distance office puts a little is Xm, it is directly to propagate into sensor with the velocity of propagation of Ym/s that the shelf depreciation that a M is put in office can produce one of two potential pulse, is called direct pulse; Another other end to cable is propagated, and is called reflected impulse.Reflected impulse can be arrived sensor through after the propagation distance of (2L-x) m by the reflection of the other end of cable arriving sensor behind the X/Ys in direct pulse.So second pulse meeting arrives sensor behind (the 2L-2x)/Ys of first pulse, can be calculated by concrete observation measured X, so just obtained office and put a little position.
In practical operation, the different constructions of cable has different velocities of wave, and we are difficult to come with speed the position of orientation discharge point, therefore reaches the purpose that location office puts by observe waveform in oscillograph.Suppose to discharge at the M of cable point place, A is a near-end, and B is a far-end, can observe a, b, three waveforms of a ' in oscillograph, and a is direct pulse, and b is a reflected impulse, and a ' is the pulse of direct pulse after the reflection of B end.By the position that the lead time of three crests just can be calculated point of discharge, as shown in Figure 2, the position x of point of discharge M is:
Wherein l is the physical length of tested cable, t
x, t
21-x, t
21+xThe used time when being respectively pulse a, b, a ' arrival sensor.
Beneficial effect: utilize that the utility model can prevent that direct measuring speed from bringing than mistake, detect required waveform easily and by calculating discharge position accurately, the efficient of detection is put in the reliability drawn game that improves the result.
Description of drawings
Fig. 1 is the time domain reflectometry schematic diagram;
The positioning system fundamental diagram is put in Fig. 2 office;
Fig. 3 is the utility model composition frame chart.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
As shown in Figure 3, be the utility model composition frame chart, the pulse sampling of sampling module charge completion signal, sampling module adopts PCI four road pulse signal acquisition cards.Since in the practical operation reflected impulse too a little less than, or the influence that exists other reflected impulses, noise to bring so system has at first designed immunity module behind the acquisition pulse signal, prevents the influence of various interference to the positioning result degree of accuracy.Immunity module mainly comprises integrating circuit, linear amplifier circuit and filtering circuit, and integrating circuit is realized the conversion of waveform, subdues the interference volume in the sampled signal, the outstanding indeclinable magnitude of current; Linear amplifier circuit amplifies sampled signal, and the undesired signal in the filtering circuit filtering sampled signal improves measuring accuracy.Through the integration processing of immunity module, the precision that detects pulse is improved significantly, and can satisfy the needs of each link of system, and alleviate the pressure to the master controller arithmetic speed, reaches the requirement of real-time.
Data acquisition unit is responsible for writing down the pulse signal of measurement, not only higher sampling rate will be arranged, and darker storage depth (can gather the data of a power frequency period at least) also will be arranged, the PCI5112 data collecting card that can adopt American National instrument company to produce.Oscillograph is judged for the calculating of master controller provides the data necessary support.Master controller is the core component of location shelf depreciation, adopts the DSP master control board.The data storage that master controller will be imported into by oscillograph and data recording card is in the DSP internal data memory, and after finishing a complete waveform acquisition sequential, data are transmitted back to host computer via RS232, by host computer analyzing and positioning discharge position.The DSP control plate of master controller is finished the sequential control process of whole positioning system, comprises that generation, time sequence control, the A/D D/A of time clock transforms control etc.The floating type DSP process chip TMS32C6713BPYP that we adopt TI company to produce simplifies the control procedure to peripheral hardware in the DSP.
Claims (5)
1. based on the cable local discharge positioning system of Time Domain Reflectometry characteristic, it is characterized in that, it comprises the sampling module that is connected with detection streamer, the output terminal of sampling module is connected with the immunity module input end, the immunity module output terminal is connected with the data acquisition unit input end, data acquisition unit is connected with master controller is two-way, and the master controller output terminal is connected with host computer; Described data acquisition unit output terminal also is connected with the oscillograph input end, and the oscillograph output terminal is connected with the master controller input end.
2. the cable local discharge positioning system based on the Time Domain Reflectometry characteristic as claimed in claim 1 is characterized in that, described immunity module comprises integrating circuit, linear amplifier circuit and the filtering circuit that connects successively.
3. the cable local discharge positioning system based on the Time Domain Reflectometry characteristic as claimed in claim 1 is characterized in that, described sampling module is PCI four road pulse signal acquisition cards.
4. the cable local discharge positioning system based on the Time Domain Reflectometry characteristic as claimed in claim 1 is characterized in that, described data acquisition unit adopts the PCI5112 data collecting card.
5. the cable local discharge positioning system based on the Time Domain Reflectometry characteristic as claimed in claim 1 is characterized in that, the TMS32C6713BPYP that described master controller is produced for TI company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120047103 CN201955430U (en) | 2011-02-25 | 2011-02-25 | Cable partial discharge positioning system based on time domain reflection characteristics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120047103 CN201955430U (en) | 2011-02-25 | 2011-02-25 | Cable partial discharge positioning system based on time domain reflection characteristics |
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| Publication Number | Publication Date |
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| CN201955430U true CN201955430U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120047103 Expired - Fee Related CN201955430U (en) | 2011-02-25 | 2011-02-25 | Cable partial discharge positioning system based on time domain reflection characteristics |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487722A (en) * | 2013-08-02 | 2014-01-01 | 深圳市智远能科技有限公司 | Distributed cable state detection system based on TDR |
| CN103777126A (en) * | 2013-11-22 | 2014-05-07 | 国家电网公司 | Transformer partial discharge ultrasonic sensor circuit structure |
| CN105988066A (en) * | 2015-02-09 | 2016-10-05 | 华北电力大学（保定） | Double-end partial discharging positioning method of long-distance cable based on correction pulses |
| CN112540269A (en) * | 2020-12-04 | 2021-03-23 | 广东电网有限责任公司 | Method for improving local discharge positioning accuracy of distribution cable |
-
2011
- 2011-02-25 CN CN 201120047103 patent/CN201955430U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487722A (en) * | 2013-08-02 | 2014-01-01 | 深圳市智远能科技有限公司 | Distributed cable state detection system based on TDR |
| CN103777126A (en) * | 2013-11-22 | 2014-05-07 | 国家电网公司 | Transformer partial discharge ultrasonic sensor circuit structure |
| CN103777126B (en) * | 2013-11-22 | 2016-09-07 | 国家电网公司 | A kind of partial discharge of transformer sonac circuit structure |
| CN105988066A (en) * | 2015-02-09 | 2016-10-05 | 华北电力大学（保定） | Double-end partial discharging positioning method of long-distance cable based on correction pulses |
| CN112540269A (en) * | 2020-12-04 | 2021-03-23 | 广东电网有限责任公司 | Method for improving local discharge positioning accuracy of distribution cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121122 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121122 Address after: 272129 torch No. 28, Shizhong District, Shandong City, Jining Province Patentee after: Jining Power Supply Company of Shandong Electric Power Group Company Patentee after: State Grid Corporation of China Address before: 272129 torch No. 28, Shizhong District, Shandong City, Jining Province Patentee before: Jining Power Supply Company of Shandong Electric Power Group Company |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20160225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |