CN105334442A - Cable partial discharge measuring circuit and device - Google Patents
Cable partial discharge measuring circuit and device Download PDFInfo
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- CN105334442A CN105334442A CN201410390102.9A CN201410390102A CN105334442A CN 105334442 A CN105334442 A CN 105334442A CN 201410390102 A CN201410390102 A CN 201410390102A CN 105334442 A CN105334442 A CN 105334442A
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Abstract
The invention discloses a cable partial discharge measuring circuit and device. The circuit comprises a capacitor apparatus connected with a detected cable, a coupling capacitor whose first end is connected with the capacitor apparatus, and a measuring impedance part whose first end is connected with a second end of the coupling capacitor, wherein the coupling capacitor is used for acquiring collection signals of the capacitor apparatus, and the coupling capacitor and the measuring impedance part cooperatively use coupling collection signals to acquire partial discharge signals. Through the cable partial discharge measuring circuit and device, the problem that the partial discharge signals cannot be accurately acquired in the prior art is solved, and the partial discharge signals can be obtained accurately in real time.
Description
Technical field
The present invention relates to electric device maintenance field, in particular to a kind of metering circuit and device of cable local discharge.
Background technology
Along with the needs that development and the urban environment of electrical network are administered, crosslinked polyethylene (XLPE) power cable is due to its rational technique and structure, and acid and alkali-resistance, corrosion resistance are strong, and install and lay simply, operation maintenance work is widely applied less.But power cable long-time running is in underground, the reasons such as humidity, filth, people's car destruction, easily there is electrical tree aging process, water-treeing etc. in the effect of voltage in addition.XLPE cable insulation ag(e)ing causes its insulation resistance to decline, and leaky cable increases, and finally breakdown fault occurs, brings about great losses.Therefore, the detection of XLPE power cable is to guarantee electric system reliability service and extend cable serviceable life and important.But, in the traditional detection method of XLPE power cable, main its insulation resistance of employing periodic measurement, leakage current, the method for dielectric loss and withstand voltage test.Although these test methods can find power cable defect to a certain extent, avoid the generation of many accidents, but its limitation is clearly, shortly occurring that the situation of accident also occurs often after the equipment investment production of stand the test, just there is breakdown accident in several hours after putting into operation in the cable even through withstand voltage test.In fact, really will find the potential aging blemiss insulated, the detection of shelf depreciation is the most effective means, but cannot obtain local discharge signal exactly in prior art.
For the problem that cannot obtain local discharge signal in prior art exactly, at present effective solution is not yet proposed.
Summary of the invention
For the problem that cannot obtain local discharge signal in correlation technique exactly, not yet propose effective solution at present, for this reason, fundamental purpose of the present invention is the metering circuit and the device that provide a kind of cable local discharge, to solve the problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of metering circuit of cable local discharge, this circuit comprises: capacitor device, is connected with tested cable; Coupling capacitance, first end is connected with capacitor device, for obtaining the collection signal of capacitor device; Measurement impedance, first end is connected with the second end of coupling capacitance, and coupling capacitance obtains local discharge signal with measurement impedance with the use of the collection signal that is coupled.
Further, metering circuit also comprises: signal picker, is connected with the output terminal of measurement impedance, for gathering local discharge signal.
Further, signal picker comprises: amplifying circuit, and the input end of amplifying circuit is connected with the output terminal of measurement impedance, for amplify local discharge signal be amplified after local discharge signal; Oscillograph, is connected with the output terminal of amplifying circuit, for gathering the local discharge signal after amplification.
Further, signal picker comprises: Data Acquisition Card, is connected with the output terminal of measurement impedance, for gathering local discharge signal.
Further, metering circuit also comprises: resonant power, and the output terminal of resonant power is connected by wave filter with the first end of capacitor device, for generating resonance electric energy.
Further, resonant power comprises: AC power; Variable-frequency power sources, is connected with the output terminal of AC power, for the alternating current of AC power is converted to variable-frequency electric; Exciting transformer, the input end of exciting transformer is connected with the output of variable-frequency power sources, for changing the voltage of variable-frequency power sources; Resonance reactor, first end is connected with the output terminal of exciting transformer, and the second end is connected with the first end of wave filter, and the second end of wave filter is connected with capacitor device, exciting transformer coordinates the state making metering circuit be in series resonance with resonance reactor, resonance reactor export resonance electric energy.
Further, metering circuit also comprises: capacitive divider, and first end is connected with the second end of wave filter, the second end ground connection, and capacitive divider and resonance reactor produce resonance.
Further, capacitor device comprises: the first electric capacity and the second electric capacity, and the first electric capacity and the second electric capacity use metal forming to be formed respectively.
To achieve these goals, according to an aspect of the present invention, provide a kind of measurement mechanism of cable local discharge, this device comprises the metering circuit of cable local discharge.
Adopt the above embodiment of the present invention, by using capacitor device to gather original discharge signal, the signal noise that capacitor device gathers is little, highly sensitive, and anti-jamming effectiveness is good.Then use measurement impedance and coupling capacitance common combination to form signals collecting loop, solve the problem that cannot obtain local discharge signal in prior art exactly, achieve the effect obtaining local discharge signal in real time accurately.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the metering circuit of cable local discharge according to the embodiment of the present invention; And
Fig. 2 is the schematic diagram of the metering circuit of a kind of optional cable local discharge according to the embodiment of the present invention.
Embodiment
First, the part noun occurred in the process be described the embodiment of the present invention or term are applicable to description below:
Shelf depreciation, when the field intensity that impressed voltage produces in the electrical apparatus, be enough to be discharged in insulated part region, but this electric discharge phenomena not forming fixing discharge channel in region of discharge is called shelf depreciation.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Fig. 1 is the schematic diagram of the metering circuit of cable local discharge according to the embodiment of the present invention.Fig. 2 is the schematic diagram of the metering circuit of a kind of optional cable local discharge according to the embodiment of the present invention.
As depicted in figs. 1 and 2, this metering circuit can comprise: capacitor device 10, coupling capacitance 30 and measurement impedance 50.
Wherein, capacitor device, is connected with tested cable 60; Coupling capacitance, first end is connected with capacitor device, for obtaining the collection signal of capacitor device; Measurement impedance, first end is connected with the second end of coupling capacitance, and coupling capacitance obtains local discharge signal with measurement impedance with the use of the collection signal that is coupled.
Adopt the above embodiment of the present invention, by using capacitor device to gather original discharge signal, the signal noise that capacitor device gathers is little, highly sensitive, and anti-jamming effectiveness is good.Then use measurement impedance and coupling capacitance common combination to form signals collecting loop, solve the problem that cannot obtain local discharge signal in prior art exactly, achieve the effect obtaining local discharge signal in real time accurately.
In the above embodiment of the present invention, metering circuit can also comprise: signal picker, is connected with the output terminal of measurement impedance, for gathering local discharge signal.
In an optional embodiment of the present invention, signal picker can comprise: amplifying circuit, and the input end of amplifying circuit is connected with the output terminal of measurement impedance, for amplify local discharge signal be amplified after local discharge signal; Oscillograph, is connected with the output terminal of amplifying circuit, for gathering the local discharge signal after amplification.
Signal texture after being amplified by amplifying circuit is more clear, when being gathered by oscillograph, can collect the signal more accurate, resolution is higher.Alternatively, the oscillograph in this embodiment can use high-speed oscilloscope, when sample frequency reaches the twice of signal highest frequency, can avoid spectral aliasing, thus can collect and truly reflect the information that the signal be coupled to comprises.
Wherein, the oscillograph in above-described embodiment can be Lecroy204Xi oscillograph.
In another optional embodiment of the present invention, signal picker can comprise: Data Acquisition Card, is connected with the output terminal of measurement impedance, for gathering local discharge signal.
Alternatively, Data Acquisition Card can use low-speed digital capture card.By above-described embodiment, the requirement to sampling rate can be reduced, in this Data Acquisition Card, can also detecting circuit be comprised.Extract shelf depreciation information by detecting circuit, and then obtain the spectrogram information of electric discharge.
According to the abovementioned embodiments of the present invention, metering circuit can also comprise: resonant power 90, and the output terminal of resonant power is connected by wave filter with the first end of capacitor device, for generating resonance electric energy.
Can output frequency be the continuously adjustable power power-supply of 20Hz ~ 300Hz (the resonance electric energy namely in above-described embodiment) by the resonant power of above-described embodiment.
Need to further illustrate, resonant power can comprise: AC power 91; Variable-frequency power sources 93, is connected with the output terminal of AC power, for the alternating current of AC power is converted to variable-frequency electric; Exciting transformer 95, the input end of exciting transformer is connected with the output of variable-frequency power sources, for changing the voltage of variable-frequency power sources; Resonance reactor 97, first end is connected with the output terminal of exciting transformer, second end is connected with the first end of wave filter, second end of wave filter 40 is connected with capacitor device, exciting transformer coordinates the state making metering circuit be in series resonance with resonance reactor, resonance reactor export resonance electric energy.
According to the abovementioned embodiments of the present invention, metering circuit can also comprise: capacitive divider 20, and first end is connected with the second end of wave filter, the second end ground connection, and capacitive divider and resonance reactor produce resonance.
By above-described embodiment, in metering circuit, arrange capacitive divider, capacitive divider and resonance reactor produce resonance can produce high pressure.
Pass through the above embodiment of the present invention, metering circuit adopts frequency conversion resonance vibration principle, send the electric capacity of shelf depreciation through measuring tested cable, during resonance applied voltage test, the resonance frequency of measuring circuit is about 54Hz, can Obtaining Accurate local discharge signal by foregoing circuit.
In the above embodiment of the present invention, capacitor device can comprise: the first electric capacity C1 and the second electric capacity C2, the first electric capacity and the second electric capacity use metal forming to be formed respectively.
Particularly, capacitor device can be built-in capacitive coupled sensors.
According to the abovementioned embodiments of the present invention, capacitive coupled sensors can comprise: coupling electrode, is connected with the semi-conductive layer of tested cable; Shell, the protective metal shell of shell and tested cable overlaps; Insulation course, is arranged between coupling electrode and shell, and coupling electrode, insulation course and shell are successively set on the outside of tested cable; Signal wire, is connected with coupling electrode, and for deriving the local discharge signal of tested cable, wherein, capacitive coupled sensors is arranged on the both sides of the joint of tested cable in couples.
Adopt the embodiment of the present invention, coupling electrode can extract the high-frequency signal of the shelf depreciation of tested cable, and the protective metal shell of shell and tested cable overlaps and its formation equipotential, reduces the loss of signal; Insulation course is arranged between coupling electrode and shell, reduces signal attenuation.The local discharge signal of tested cable is derived by the signal wire in above-described embodiment, and capacitive coupled sensors is arranged on the both sides of the joint of tested cable in couples, the local discharge signal of the tested cable of Signal analysis that can be detected by two capacitive coupled sensors results from the both sides of joint or the content of joint.By the above embodiment of the present invention, solve the problem that cannot obtain local discharge signal exactly of the prior art, realize the effect gathering the local discharge signal of tested cable exactly.
In the above embodiment of the present invention, coupling electrode is metal forming, metal forming is fixed on the semi-conductive layer of the stress cone of the joint inside of tested cable.
Particularly, can directly utilize semi-conductive layer on the stress cone of the joint inside of tested cable or wrapped metal forming or copper mesh as coupling electrode, this coupling electrode and core conductor form capacitor device, form coupling capacitance with metal screen layer, and utilize a part for the semi-conductive layer of cable as measurement impedance to the local discharge signal that is coupled.
In the above embodiment of the present invention, shell can comprise: two semicircular aluminium shells, and two semicircle aluminium shells interlock and are connected across the incision position of the protective metal shell of tested cable, tested cable on two semicircular aluminium shell cards.
Alternatively, can comprise: rubber in the insulation course in above-described embodiment, this rubber can be silicon rubber.
Further, signal wire is coaxial radioshielding line, and signal wire is welded on shell.
Further, capacitive coupled sensors also comprises: ground wire, and ground wire is connected with shell, and ground wire is welded on shell.
The housing exterior of capacitive coupled sensors can also be enclosed with two-layer water blocking tape further.
Particularly, the diameter of built-in sensor can be made to measure according to the concrete size of tested cable, is respectively metal forming, silicon rubber, aluminium shell from the inside to surface.Wherein, the spectrum distribution, sensitivity etc. of built-in sensor coupled signal and sensor material, size, detection impedance etc. closely related, reasonably can select by carrying out square-wave response test.
In the above embodiment of the present invention, the effect of built-in sensor three-decker is respectively:
1) metal forming effect: metal forming, as coupling electrode, is used for extracting the high-frequency signal of shelf depreciation.
2) silicon rubber effect: silicone rubber insulation layer is the dielectric isolation layer between metal forming and aluminium shell.
3) aluminium shell effect: aluminium shell is by overlapping, with its formation equipotential with the corrugated aluminium sheath (protective metal shell namely in above-described embodiment) of tested cable.
One group of built-in sensor in above-described embodiment is divided into two (settings in couples namely in above-described embodiment), be arranged on the intermediate head both sides of tested cable respectively, for identifying that local discharge signal results from joint both sides or intermediate head is inner.
The concrete installation process of built-in sensor is:
(1) in intermediate head installation process, metal forming is fixed on the semi-conductive layer of tested cable, then is interlocked by two semicircle aluminium shells and be connected across corrugated aluminium sheath incision position, make itself and protective metal shell equipotential.Metal forming is as coupling electrode, the core conductor of this electrode and tested cable forms the electric capacity in the capacitor device in above-described embodiment, arrange a metal forming respectively at the first end of the joint of tested cable and second segment, each metal forming respectively core conductor forms an electric capacity.
(2) sensor extension line aspect, needs to draw signal wire and ground wire from metal foil electrode and aluminium shell respectively.Signal wire adopts coaxial radioshielding line, and the diameter of line is about 2 ~ 3mm.Wiring adopts the mode of welding on sensor outer housing; reserved two wiring points on shell; on two semicircle shell cards after cable; extension line is welded on respectively on two wiring points; extension line taps into sensor side by BNC connector and includes in the terminal box of measurement impedance and protective device, and is connected with follow-up amplifier and signal acquiring system by this terminal box.
(3), after sensor installs, partly to overlap wrapped 5 ~ 6 layers of DJ-30 insulating self-adhesive band more wrapped two-layer water blocking tape at its outside surface.
(4), after above-mentioned process completes, jiont treatment work can be carried out according to intermediate head normal process.
In another one optional embodiment of the present invention, the checkout equipment of cable local discharge can comprise: capacitive coupled sensors; Terminal box, comprises measurement impedance, and the signal wire of capacitive coupled sensors accesses terminal box by coaxial cable connector BNC, and the original signal of the tested cable that signal wire exports coordinates to be coupled with measurement impedance and obtains local discharge signal.
In the above embodiment of the present invention, on the basis setting built-in sensor, corresponding signal condition unit can also be set, as broadband high-pass wave filter, broad band amplifier, power frequency Zero-cross comparator unit, detecting circuit, high-speed figure capture card, industrial computer etc., and can corresponding data processing software be passed through, as used a set of detection system of LabVIEW software programming, realize the functions such as the collection of signal, analysis, storage.
Can connection signal conditioning unit and data processing software specific to terminal box in above-described embodiment.
As can be seen from the above description, present invention achieves following technique effect:
Adopt the above embodiment of the present invention, by using capacitor device to gather original discharge signal, the signal noise that capacitor device gathers is little, highly sensitive, and anti-jamming effectiveness is good.Then use measurement impedance and coupling capacitance common combination to form signals collecting loop, solve the problem that cannot obtain local discharge signal in prior art exactly, achieve the effect obtaining local discharge signal in real time accurately.
The claimed signal picker of the present invention, processor and each assembly forming this collector be all a kind of have determine shape, structure and occupy the entity products of certain space.Such as, pick-up unit, microprocessor, signal processor, sub-processor etc. are all can independent operating, the computer equipment with particular hardware structure, terminal or server.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a metering circuit for cable local discharge, is characterized in that, comprising:
Capacitor device, is connected with tested cable;
Coupling capacitance, first end is connected with described capacitor device, for obtaining the collection signal of described capacitor device;
Measurement impedance, first end is connected with the second end of described coupling capacitance, and described coupling capacitance obtains local discharge signal with described measurement impedance with the use of the described collection signal that is coupled.
2. metering circuit according to claim 1, is characterized in that, described metering circuit also comprises:
Signal picker, is connected with the output terminal of described measurement impedance, for gathering described local discharge signal.
3. metering circuit according to claim 2, is characterized in that, described signal picker comprises:
Amplifying circuit, the input end of described amplifying circuit is connected with the output terminal of described measurement impedance, for amplify described local discharge signal be amplified after local discharge signal;
Oscillograph, is connected with the output terminal of described amplifying circuit, for gathering the local discharge signal after described amplification.
4. metering circuit according to claim 2, is characterized in that, described signal picker comprises:
Data Acquisition Card, is connected with the output terminal of described measurement impedance, for gathering described local discharge signal.
5. metering circuit according to claim 1, is characterized in that, described metering circuit also comprises:
Resonant power, the output terminal of described resonant power is connected by wave filter with the first end of described capacitor device, for generating resonance electric energy.
6. metering circuit according to claim 5, is characterized in that, described resonant power comprises:
AC power;
Variable-frequency power sources, is connected with the output terminal of described AC power, for the alternating current of described AC power is converted to variable-frequency electric;
Exciting transformer, the input end of described exciting transformer is connected with the output of described variable-frequency power sources, for changing the voltage of described variable-frequency power sources;
Resonance reactor, first end is connected with the output terminal of described exciting transformer, second end is connected with the first end of wave filter, second end of described wave filter is connected with described capacitor device, described exciting transformer coordinates with described resonance reactor the state making described metering circuit be in series resonance, and described resonance reactor exports described resonance electric energy.
7. metering circuit according to claim 6, is characterized in that, described metering circuit also comprises:
Capacitive divider, first end is connected with the second end of described wave filter, the second end ground connection, and described capacitive divider and described resonance reactor produce resonance.
8. metering circuit according to claim 1, is characterized in that, described capacitor device comprises:
First electric capacity and the second electric capacity, described first electric capacity and described second electric capacity use metal forming to be formed respectively.
9. a measurement mechanism for cable local discharge, is characterized in that, comprises the metering circuit of the cable local discharge in claim 1 to 8 described in any one.
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| CN201410390102.9A CN105334442A (en) | 2014-08-08 | 2014-08-08 | Cable partial discharge measuring circuit and device |
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| CN201410390102.9A CN105334442A (en) | 2014-08-08 | 2014-08-08 | Cable partial discharge measuring circuit and device |
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| CN105334442A true CN105334442A (en) | 2016-02-17 |
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| CN201410390102.9A Pending CN105334442A (en) | 2014-08-08 | 2014-08-08 | Cable partial discharge measuring circuit and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108427068A (en) * | 2018-03-29 | 2018-08-21 | 云南电网有限责任公司电力科学研究院 | A kind of partial discharge of switchgear detection device and method |
| CN108445360A (en) * | 2018-03-29 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of partial discharge of switchgear positioning device and method |
| CN109164285A (en) * | 2018-07-06 | 2019-01-08 | 正威科技（深圳）有限公司 | The compound medical cable noise of one kind and peak synthesis test device and its method |
| CN110988773A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Verification comparison method of ultraviolet imager |
| CN110988772A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Check-up comparison circuit of ultraviolet imager |
| CN113866621A (en) * | 2021-09-26 | 2021-12-31 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
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| CN109164285B (en) * | 2018-07-06 | 2021-03-02 | 正威科技（深圳）有限公司 | Composite medical cable noise and peak value comprehensive testing device and method thereof |
| CN110988773A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Verification comparison method of ultraviolet imager |
| CN110988772A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Check-up comparison circuit of ultraviolet imager |
| CN113866621A (en) * | 2021-09-26 | 2021-12-31 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
| CN113866621B (en) * | 2021-09-26 | 2023-06-13 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
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