CN205427170U - A detecting system for detecting partial discharge detector - Google Patents
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Abstract
The utility model discloses a detecting system for detecting partial discharge detector. Wherein, this system includes: signal generator for to detect signal output to TEM cell, TEM cell, be used for based on the electromagnetic field is establish to the detected signal, wherein, install partial discharge detector and the sensor that remains the measuring on TEM cell's the apron, the partial discharge detector that waits to detect and it is right that the sensor all is used for the electromagnetic field detects, oscilloscope, with the partial discharge detector that waits to detect with the sensor is connected, is used for the basis the partial discharge detector's that waits to detect an output signal and the 2nd output signal of sensor is used for indicateing treat the partial discharge detector's of detection performance parameter's testing result. The utility model provides a technical problem of accuracy of the undeterminable testing result that causes of the prior art accuracy that can't detect partial discharge detector.
Description
Technical field
This utility model relates to power domain, in particular to a kind of detecting system for detecting Partial discharge detector.
Background technology
Current impulse (rising edge is ns level) when there is shelf depreciation in power equipment can be at the electromagnetic wave of internal motivation frequency up to number GHz, superfrequency (UltraHighFrequency, UHF) Partial Discharge Detecting Technology is through detecting this electromagnetic wave and realizes the purpose of Partial Discharge Detection.Superfrequency method detection frequency range high (usually 300M to 3000MHz), has that capacity of resisting disturbance is strong, detection sensitivity advantages of higher, can be used for detection, location and the fault type recognition of power equipment shelf depreciation class defect.Dividing regulation according to radio frequency, 300MHz to 3000MHz frequency band is divided into superfrequency, and therefore this detection method is referred to as superfrequency method.
It is known that, use the Partial discharge detector of superfrequency method owing to its capacity of resisting disturbance is strong, detection sensitivity advantages of higher, it is widely used among the Partial Discharge Detection of power equipment, but, owing to the situation of power equipment generation shelf depreciation is fast changing, changeable and be difficult to, it is envisioned that the method for not detection Partial discharge detector accuracy in prior art, the most just to determine the accuracy of testing result.
For above-mentioned problem, effective solution is the most not yet proposed.
Utility model content
This utility model embodiment provides a kind of detecting system for detecting Partial discharge detector, cannot detect the technical problem of the accuracy that cannot determine testing result that the accuracy of Partial discharge detector causes at least solving prior art.
An aspect according to this utility model embodiment, it is provided that a kind of detecting system for detecting Partial discharge detector, including: signal generator, for detection signal is exported to TEM cell；Described TEM cell, for setting up electromagnetic field based on described detection signal, wherein, the cover plate of described TEM cell being provided with Partial discharge detector to be detected and sensor, described Partial discharge detector to be detected and described sensor are used to detect described electromagnetic field；Oscillograph, it is connected with described Partial discharge detector to be detected and described sensor, for the first output signal according to described Partial discharge detector to be detected and the second output signal of described sensor, obtain the testing result of performance parameter for indicating described Partial discharge detector to be detected.
Further, described performance parameter at least include following one or more: average effective height, detection sensitivity and dynamic range.
Further, the described cover plate of described TEM cell being provided with opening, described Partial discharge detector to be detected and described sensor are respectively provided with in said opening.
Further, the input of described TEM cell uses N-type coaxial fitting, and described transverse electro-magnetic wave indoor are provided with the absorbing material of wedgelike.
Further, described sensor is one pole standard probe sensor, and wherein, described one pole standard probe sensor includes sub-miniature A connector, and is arranged on the earth plate on described sub-miniature A connector and dielectric.
Further, described system also includes: the computer being connected with described oscillograph, is used for controlling described signal generator and exports described detection signal, and analyzes described testing result.
Further, described Partial discharge detector to be detected is the superfrequency shelf depreciation live detection instrument of the ultrahigh frequency electromagnetic wave signal for coupling 300MHz to 3000MHz.
Further, the voltage standing wave ratio of described TEM cell is in the range of 80MHz to 2000MHz.
Further, the rising edge of a pulse of described detection signal is less than or equal to 400ps, and the pulse width of described detection signal is more than or equal to 10ns.
Further, described oscillographic analog bandwidth is more than or equal to 2GHz, and described oscillographic sample frequency is more than or equal to 10Gsps.
In this utility model embodiment, use the signal generator arranged, TEM cell and oscillograph mode, by utilizing signal generator to send controlled detection signal, electromagnetic field is set up based on detection signal by TEM cell, and then by the oscillograph the first output signal according to Partial discharge detector to be detected and the second output signal of sensor, obtain the testing result of performance parameter for indicating Partial discharge detector to be detected, reach the purpose of the performance parameter of detection Partial discharge detector to be detected, it is achieved thereby that increase the technique effect of the accuracy of Partial discharge detector, and then solve prior art and cannot detect the technical problem of the accuracy that cannot determine testing result that the accuracy of Partial discharge detector causes.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by of the present utility model, constitutes the part of the application, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is a kind of structural representation optionally with the detecting system in detection Partial discharge detector according to this utility model embodiment；
Fig. 2 is the structural representation of a kind of optional sensor according to this utility model embodiment；
Fig. 3 is the structural representation optionally with the detecting system in detection Partial discharge detector of the another kind according to this utility model embodiment.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that this utility model scheme, below in conjunction with the accompanying drawing in this utility model embodiment, technical scheme in this utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of this utility model part rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all should belong to the scope of this utility model protection.
It should be noted that term " first " in specification and claims of the present utility model and above-mentioned accompanying drawing, " second " etc. are for distinguishing similar object, without being used for describing specific order or precedence.Should be appreciated that the data of so use can be exchanged in the appropriate case, in order to embodiment of the present utility model described herein can be implemented with the order in addition to those here illustrating or describing.In addition, term " includes " and " having " and their any deformation, it is intended to cover non-exclusive comprising, such as, contain series of steps or the process of unit, method, system, product or equipment be not necessarily limited to those steps or the unit clearly listed, but can include the most clearly listing or for intrinsic other step of these processes, method, product or equipment or unit.
According to this utility model embodiment, it is provided that the embodiment of a kind of detecting system for detecting Partial discharge detector.Fig. 1 is the structural representation of the detecting system for detecting Partial discharge detector according to this utility model embodiment, as it is shown in figure 1, the detecting system for detecting Partial discharge detector includes following ingredient: signal generator 102, TEM cell 104 and oscillograph 106.
Wherein, signal generator 102, for exporting detection signal to TEM cell 104；Described TEM cell 104, for setting up electromagnetic field based on described detection signal, wherein, being provided with Partial discharge detector 108 to be detected and sensor 110 on the cover plate of described TEM cell 104, described Partial discharge detector 108 to be detected and described sensor 110 are used to detect described electromagnetic field；Oscillograph 106, it is connected with described Partial discharge detector 108 to be detected and described sensor 110, for the first output signal according to described Partial discharge detector 108 to be detected and the second output signal of described sensor 110, obtain the testing result of performance parameter for indicating described Partial discharge detector 108 to be detected.
nullIn this utility model embodiment，Use the signal generator 102 arranged、TEM cell 104 and oscillograph 106 mode，By utilizing signal generator 102 to send controlled detection signal，Electromagnetic field is set up based on detection signal by TEM cell 104，And then by the oscillograph 106 first output signal according to Partial discharge detector 108 to be detected and the second output signal of sensor 110，Obtain the testing result of performance parameter for indicating Partial discharge detector 108 to be detected，Reach the purpose of the performance parameter of detection Partial discharge detector to be detected 108，It is achieved thereby that increase the technique effect of the accuracy of Partial discharge detector，And then solve prior art and cannot detect the technical problem of the accuracy that cannot determine testing result that the accuracy of Partial discharge detector causes.
Alternatively, described performance parameter at least include following one or more: average effective height, detection sensitivity and dynamic range.
Alternatively, the described cover plate of described TEM cell 104 being provided with opening, described Partial discharge detector 108 to be detected and described sensor 110 are respectively provided with in said opening.
Alternatively, the input of described TEM cell 104 uses N-type coaxial fitting, is provided with the absorbing material of wedgelike in described TEM cell 104.
Alternatively, as in figure 2 it is shown, described sensor 110 is one pole standard probe sensor, wherein, described one pole standard probe sensor includes sub-miniature A connector 202, and is arranged on the earth plate 204 on described sub-miniature A connector 202 and dielectric 206.
Alternatively, as shown in Figure 3, the detecting system being used for detecting Partial discharge detector of this utility model embodiment also includes: the computer 302 being connected with described oscillograph 106, is used for controlling described signal generator 102 and exports described detection signal, and analyzes described testing result.
Alternatively, described Partial discharge detector 108 to be detected is the superfrequency shelf depreciation live detection instrument of the ultrahigh frequency electromagnetic wave signal for coupling 300MHz to 3000MHz.
Alternatively, the voltage standing wave ratio of described TEM cell 104 is in the range of 80MHz to 2000MHz.
Alternatively, the rising edge of a pulse of described detection signal is less than or equal to 400ps, and the pulse width of described detection signal is more than or equal to 10ns.
Alternatively, the analog bandwidth of described oscillograph 106 is more than or equal to 2GHz, and the sample frequency of described oscillograph 106 is more than or equal to 10Gsps.
Below, the Cleaning Principle of the detecting system for detecting Partial discharge detector is described by this utility model embodiment:
(1) the average effective height of Partial discharge detector is detected
Average effective height is to characterize Partial discharge detector to be detected the electromagnetic wave energy that shelf depreciation radiates is converted to the ability of voltage signal, and dimension is mm.Average effective height HeF () is defined as:
In formula (1): f is signal frequency；EiThe electric field intensity amplitude of sensor incident electromagnetic wave when () is frequency f f；U0The output voltage amplitude of sensor when () is frequency f f.Average effective height refers to the accumulative meansigma methods of ultra high-frequency partial discharge sensor each Frequency point effective depth.
The corresponding interface by Partial discharge detector to be detected with the detecting system being used for detecting Partial discharge detector is needed to be attached when measuring the average effective height of Partial discharge detector to be detected.
By signal generator to the pulse signal (being equivalent to above-mentioned detection signal) of the certain amplitude of transverse electro-magnetic wave indoor injection, pulse electromagnetic field is set up in TEM cell, wherein, Partial discharge detector to be detected is placed in TEM cell top and windows place.The position of windowing of TEM cell is selected in the TEM cell region near terminal about 1/3, and insert space is open and field strength distribution is more uniform.
If E (t) is the electric field at the Partial discharge detector position that transverse electro-magnetic wave indoor are to be detected, u (t) is the voltage signal of Partial discharge detector's output to be detected.The effect of Partial discharge detector to be detected is that incident electric fields is converted to voltage signal output, according to incident electric fields and the relation of output voltage, i.e. can get the transfer function H (f) of Partial discharge detector to be detected, this parameter reflects the size of the reception shelf depreciation electromagnetic wave signal ability of Partial discharge detector to be detected:
In formula (2), U (f) is the fast Fourier transform of output voltage u (t), E (f) is the fast Fourier transform of incident electric fields E (t), H (f) is the transmission function of Partial discharge detector to be detected, owing to the unit of voltage is V, electric field unit is V/mm, so the dimension of H (f) is mm, so also can be called the frequency domain effective depth of Partial discharge detector to be detected.For same incident electric fields, the level of Partial discharge detector's output signal to be detected is the highest, then it represents that its coupling ability is the strongest, namely effective depth is the biggest.In addition to frequency domain effective depth, reflect that the parameter of Partial discharge detector's receptivity to be detected also has directional diagram, gain and polarization characteristic etc..In view of the actual installation mode of sensor in high pressure equipment, the directional diagram of Partial discharge detector to be detected and polarised direction the most do not have essential meaning, and frequency domain effective depth substantially reflects is exactly its gain characteristic at different frequencies, therefore using the frequency domain effective depth of Partial discharge detector to be detected as the key index characterizing its performance.
Not it is entirely equally distributed in view of the electric field in TEM cell, and the electric field E of any pointiT () is also difficult to accurately measure so that direct basis formula (2) is accurately measured sensor frequency domain effective depth and be there is certain difficulty not yet.Time domain reference measurement method is proposed for this.
So-called time domain reference measurement method, is i.e. a kind of method being carried out secondary indication Partial discharge detector's characteristic to be detected by sensor characteristics.The selection of sensor is most important, it is desirable to it is little on the impact of tested electric field, and receives characteristic it is known that the sensor for the detecting system that detects Partial discharge detector of the present embodiment is one pole standard probe sensor.
Measuring process includes: by signal generator injected pulse voltage VITo TEM cell, being respectively adopted sensor and the electric field that transverse electro-magnetic wave chamber interior produces is measured by Partial discharge detector to be detected, the voltage output of generation is respectively VorAnd Vos.If the transmission function of TEM cell is Hcell, the transmission function of one pole standard probe sensor is Href, the transmission function of Partial discharge detector to be detected to be measured is Hsens, the transmission characteristic of the detecting system for detecting Partial discharge detector is Hsys, then the measurement output V of sensorMrMeasurement with Partial discharge detector to be detected to be measured exports VMsCan be expressed as:
It is divided by by about two formulas up and down in formula (3), can obtain by the expression formula transferring function to represent Partial discharge detector's transmission function to be detected to be measured of sensor:
From (4) formula, utilize the transfer function H of sensorref, the transfer function characteristics of Partial discharge detector to be detected to be measured, for the voltage response of injected pulse signal, can be tried to achieve by sensor and Partial discharge detector to be detected.Time domain reference measurement method is advantageous in that transmission characteristic H needing not know about TEM cellcellFrequency response H with the detecting system for detecting Partial discharge detectorsys, because what it was just as the impact of all measurements, and about fallen when taking ratio.And, this measurement technology is the most insensitive for the wave distortion of incidence wave, because the impact that its effect measures signal for two ways is all identical.
In a given frequency range, this Partial discharge detector to be detected effective depth curve in this frequency range can be obtained as stated above, the average effective height value obtained in this frequency range of finally averaging in this frequency range.
(2) detection sensitivity and the dynamic range of Partial discharge detector are detected
Under test condition, the minimum pulse maximum field strength E that Partial discharge detector to be detected can differentiateimin.Under test condition, maximum detection transient electric field intensity peak E that Partial discharge detector to be detected can be detected byimaxWith minimum transient electric field intensity peak EiminRatio, be logarithmically expressed as
From the physical characteristic of partial-discharge ultrahigh-frequency signal, what Partial discharge detector to be detected substantially measured is the electric field intensity of the pulse electromagnetic wave of electric discharge radiation, carry out the testing result of unified representation superfrequency shelf depreciation for this proposition transient peak impulse electric field strength, its dimension is " μ V/m ".No matter so instrument characteristic, in the case of in-field is consistent, what its testing result transmitted with it that result of function deconvolution obtains is in-field, and different system result after inverse should be consistent.Therefore, testing result based on the representation difference detecting instrument entering field wave electric field intensity not only has a comparability, and reflect is the physical essence of superfrequency detection, has important value for the diagnosis further of shelf depreciation.
TEM cell is used to carry out the test of Partial discharge detector's detection sensitivity to be detected.TEM cell is used for shielding external interference, and eliminates signal catadioptric and the impact of propagation attenuation by the structure of its transitional type transmission wire type.
The pulse signal of each amplitude point is exported in effective output area of signal generator, then the field intensity of transverse electro-magnetic wave interior sensor installed position (being also simultaneously the installation site of Partial discharge detector to be detected) is demarcated, set up the mapping relations of signal generator output amplitude and TEM cell test point field intensity, can be by formula (5) by the output U of sensoroCalculate,
In formula: UoFor sensor output voltage amplitude frequency curve；HrefEffective depth curve for sensor.
By EiTime domain waveform E at sensor mounting location can be tried to achievei(t)。
The output amplitude of regulation signal generator, until Partial discharge detector to be detected can reliably reflect, with the signal to noise ratio not less than 2, the pulse signal that signal generator exports, first the output amplitude of now signal generator is obtained, then the corresponding relation between electric field intensity at the signal generator output amplitude drawn according to back and sensor mounting location, drawing incident field intensity now, this field intensity is the sensitivity of Partial discharge detector to be detected.
Continue the output amplitude of regulation signal generator, when the output amplitude of signal generator increases to a certain value, the display measured value of Partial discharge detector to be detected reaches full scale maximum, beyond this value, the record and display mode that cause Partial discharge detector to be detected are overflowed, draw incident field intensity now, this field intensity is the maximum detection transient state field intensity of Partial discharge detector to be detected, calculate the multiple proportion between maximum detection transient electric field intensity peak and Partial discharge detector's sensitivity to be detected, i.e. can get the dynamic range of instrument.
Utilize the detecting system for detecting Partial discharge detector of the present utility model can realize average effective height, detection sensitivity and the measurement of three parameters of dynamic range to arbitrary superfrequency shelf depreciation live detection instrument, simultaneously can specify that corresponding standard according to substantial amounts of test result, and then the research and development of specification superfrequency shelf depreciation live detection instrument and production.
In above-described embodiment of the present utility model, the description to each embodiment all emphasizes particularly on different fields, and does not has the part described in detail, may refer to the associated description of other embodiments in certain embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, can realize by another way.Wherein, device embodiment described above is only schematically, the division of the most described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, the most multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, unit or module or communication connection, can be being electrical or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, i.e. may be located at a place, or can also be distributed on multiple unit.Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of this utility model can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated unit both can realize to use the form of hardware, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, can be stored in a computer read/write memory medium.Based on such understanding, completely or partially can embodying with the form of software product of part that prior art is contributed by the technical solution of the utility model the most in other words or this technical scheme, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be for personal computer, server or the network equipment etc.) performs all or part of step of method described in each embodiment of this utility model.And aforesaid storage medium includes: USB flash disk, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD.
The above is only preferred implementation of the present utility model; it should be pointed out that, for those skilled in the art, on the premise of without departing from this utility model principle; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (10)
1. the detecting system being used for detecting Partial discharge detector, it is characterised in that including:
Signal generator, for exporting detection signal to TEM cell；
Described TEM cell, for setting up electromagnetic field based on described detection signal, wherein, the cover plate of described TEM cell being provided with Partial discharge detector to be detected and sensor, described Partial discharge detector to be detected and described sensor are used to detect described electromagnetic field；
Oscillograph, it is connected with described Partial discharge detector to be detected and described sensor, for the first output signal according to described Partial discharge detector to be detected and the second output signal of described sensor, obtain the testing result of performance parameter for indicating described Partial discharge detector to be detected.
System the most according to claim 1, it is characterised in that described performance parameter at least include following one or more: average effective height, detection sensitivity and dynamic range.
System the most according to claim 1, it is characterised in that be provided with opening on the described cover plate of described TEM cell, described Partial discharge detector to be detected and described sensor are respectively provided with in said opening.
System the most according to claim 1, it is characterised in that the input of described TEM cell uses N-type coaxial fitting, and described transverse electro-magnetic wave indoor are provided with the absorbing material of wedgelike.
System the most according to claim 1, it is characterised in that described sensor is one pole standard probe sensor, wherein, described one pole standard probe sensor includes sub-miniature A connector, and is arranged on the earth plate on described sub-miniature A connector and dielectric.
System the most according to claim 1, it is characterised in that described system also includes:
The computer being connected with described oscillograph, is used for controlling described signal generator and exports described detection signal, and analyze described testing result.
System the most according to claim 1, it is characterised in that described Partial discharge detector to be detected is the superfrequency shelf depreciation live detection instrument of the ultrahigh frequency electromagnetic wave signal for coupling 300MHz to 3000MHz.
System the most according to any one of claim 1 to 5, it is characterised in that the voltage standing wave ratio of described TEM cell is in the range of 80MHz to 2000MHz.
System the most according to any one of claim 1 to 5, it is characterised in that the rising edge of a pulse of described detection signal is less than or equal to 400ps, the pulse width of described detection signal is more than or equal to 10ns.
System the most according to any one of claim 1 to 5, it is characterised in that described oscillographic analog bandwidth is more than or equal to 2GHz, described oscillographic sample frequency is more than or equal to 10Gsps.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107462853A (en) * | 2017-06-23 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of scaling method of superfrequency partial discharge detecting system |
| CN110619702A (en) * | 2019-09-29 | 2019-12-27 | 广州国瀚计算机通讯科技有限公司 | Method and device for efficiently identifying face value of magnetic metal wire of RMB |
| CN110988622A (en) * | 2019-11-29 | 2020-04-10 | 河南省恒华电力设备有限公司 | High tension switchgear partial discharge monitoring and early warning system |
| CN111551814A (en) * | 2020-06-11 | 2020-08-18 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Method for testing electromagnetic environment effect of monitoring system in variable-rising-edge wide-pulse electric field environment |
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| CN107462853A (en) * | 2017-06-23 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of scaling method of superfrequency partial discharge detecting system |
| CN111918002A (en) * | 2019-05-10 | 2020-11-10 | 华为技术有限公司 | Control method of shape memory alloy motor in camera device and camera device |
| CN111918002B (en) * | 2019-05-10 | 2022-02-18 | 华为技术有限公司 | Control method of shape memory alloy motor in camera device and camera device |
| CN110619702A (en) * | 2019-09-29 | 2019-12-27 | 广州国瀚计算机通讯科技有限公司 | Method and device for efficiently identifying face value of magnetic metal wire of RMB |
| CN110988622A (en) * | 2019-11-29 | 2020-04-10 | 河南省恒华电力设备有限公司 | High tension switchgear partial discharge monitoring and early warning system |
| CN111551814A (en) * | 2020-06-11 | 2020-08-18 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Method for testing electromagnetic environment effect of monitoring system in variable-rising-edge wide-pulse electric field environment |
| CN111551814B (en) * | 2020-06-11 | 2022-03-29 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Method for testing electromagnetic environment effect of monitoring system in variable-rising-edge wide-pulse electric field environment |
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