CN204028288U - The checkout equipment of cable local discharge and capacitive coupled sensors - Google Patents

The checkout equipment of cable local discharge and capacitive coupled sensors Download PDF

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Publication number
CN204028288U
CN204028288U CN201420448694.0U CN201420448694U CN204028288U CN 204028288 U CN204028288 U CN 204028288U CN 201420448694 U CN201420448694 U CN 201420448694U CN 204028288 U CN204028288 U CN 204028288U
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China
Prior art keywords
capacitive coupled
coupled sensors
shell
signal
tested cable
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CN201420448694.0U
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Inventor
任志刚
齐伟强
张玉佳
刘若溪
程序
段大鹏
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State Grid Corp of China SGCC
State Grid Beijing Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Beijing Electric Power Co Ltd
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Abstract

The utility model discloses a kind of checkout equipment and capacitive coupled sensors of cable local discharge.Wherein, 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.By the utility model, solve the problem that cannot obtain local discharge signal in prior art exactly, achieve the effect obtaining local discharge signal in real time accurately.

Description

The checkout equipment of cable local discharge and capacitive coupled sensors
Technical field
The utility model relates to electric device maintenance field, in particular to a kind of checkout equipment and capacitive coupled sensors 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.
utility model content
For the problem that cannot obtain local discharge signal in correlation technique exactly, at present effective solution is not yet proposed, for this reason, fundamental purpose of the present utility model is the checkout equipment and the capacitive coupled sensors that provide a kind of cable local discharge, to solve the problem.
To achieve these goals, according to an aspect of the present utility model, provide a kind of capacitive coupled sensors, this capacitive coupled sensors comprises: 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.
Further, 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.
Further, shell comprises: 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.
Further, insulation course comprises: 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.
To achieve these goals, according to an aspect of the present utility model, provide a kind of checkout equipment of cable local discharge, this checkout equipment comprises: 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.
Adopt above-described embodiment of the present utility model, 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 further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of the capacitive coupled sensors according to the utility model embodiment;
Fig. 2 is the schematic diagram of the metering circuit of cable local discharge according to the utility model embodiment; And
Fig. 3 is the schematic diagram of the metering circuit of a kind of optional cable local discharge according to the utility model embodiment.
Embodiment
First, the part noun occurred in the process be described the utility model embodiment 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 utility model scheme is understood better in order to make the personnel of the utility model technical field, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, instead of whole embodiments.Based on the embodiment in the utility model, the utility model exercising ordinary skill is not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the utility model protection.
It should be noted that, term " first ", " second " etc. in instructions of the present utility model 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 embodiment of the present utility model 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 capacitive coupled sensors according to the utility model embodiment.
Capacitive coupled sensors as shown in Figure 1 can comprise: coupling electrode 1, is connected with the semi-conductive layer of tested cable; Shell 3, the protective metal shell of shell and tested cable overlaps; Insulation course 5, 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 (not shown), 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 utility model embodiment, 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 above-described embodiment of the present utility model, 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 above-described embodiment of the present utility model, 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 above-described embodiment of the present utility model, 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 above-described embodiment of the present utility model, 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.
To achieve these goals, according to an aspect of the present utility model, provide a kind of checkout equipment of cable local discharge, this checkout equipment comprises: 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.
Adopt the utility model embodiment, 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 above-described embodiment of the present utility model, 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 above-described embodiment of the present utility model, 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.
Fig. 2 is the schematic diagram of the metering circuit of cable local discharge according to the utility model embodiment.Fig. 3 is the schematic diagram of the metering circuit of a kind of optional cable local discharge according to the utility model embodiment.
As shown in Figures 2 and 3, 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 above-described embodiment of the present utility model, 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 core conductor of the coupling electrode in above-described embodiment and tested cable forms the electric capacity in the capacitor device in above-described embodiment.
In above-described embodiment of the present utility model, metering circuit can also comprise: signal picker, is connected with the output terminal of measurement impedance, for gathering local discharge signal.
In the utility model an optional embodiment, 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 Lecroy 204Xi oscillograph.
In another optional embodiment of the utility model, 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 above-described embodiment of the present utility model, 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 electric; 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 above-described embodiment of the present utility model, 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.
By the utility model above-described embodiment, 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 above-described embodiment of the present utility model, 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.
As can be seen from the above description, the utility model achieves following technique effect:
Adopt the utility model embodiment, 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 above-described embodiment of the present utility model, 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.
The claimed signal picker of the utility model, 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 preferred embodiment of the present utility model, be not limited to the utility model, for the technician in the utility model field, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (8)

1. a capacitive coupled sensors, is characterized in that, comprising:
Coupling electrode, is connected with the semi-conductive layer of tested cable;
Shell, the protective metal shell of described shell and described tested cable overlaps;
Insulation course, is arranged between described coupling electrode and described shell, and described coupling electrode, described insulation course and described shell are successively set on the outside of described tested cable;
Signal wire, is connected with described coupling electrode, and for deriving the local discharge signal of described tested cable, wherein, described capacitive coupled sensors is arranged on the both sides of the joint of described tested cable in couples.
2. capacitive coupled sensors according to claim 1, is characterized in that, described coupling electrode is metal forming, described metal forming is fixed on the described semi-conductive layer of the stress cone of the joint inside of described tested cable.
3. capacitive coupled sensors according to claim 1, is characterized in that, described shell comprises:
Two semicircular aluminium shells, described two semicircle aluminium shells interlock and are connected across the incision position of the protective metal shell of described tested cable, described tested cable on described two semicircular aluminium shell cards.
4. capacitive coupled sensors according to claim 1, is characterized in that, described insulation course comprises: rubber.
5. capacitive coupled sensors according to claim 1, is characterized in that, described signal wire is coaxial radioshielding line, and described signal wire welding on the housing.
6. capacitive coupled sensors according to claim 1, is characterized in that, described capacitive coupled sensors also comprises:
Ground wire, described ground wire is connected with described shell, and described ground wire welding on the housing.
7. capacitive coupled sensors according to claim 1, is characterized in that, the housing exterior of described capacitive coupled sensors can also be enclosed with two-layer water blocking tape.
8. a checkout equipment for cable local discharge, is characterized in that, comprising:
Capacitive coupled sensors in claim 1 to 7 described in any one;
Terminal box, comprises measurement impedance, and the signal wire of described capacitive coupled sensors accesses described terminal box by coaxial cable connector BNC, and the original signal of the tested cable that described signal wire exports coordinates to be coupled with described measurement impedance and obtains local discharge signal.
CN201420448694.0U 2014-08-08 2014-08-08 The checkout equipment of cable local discharge and capacitive coupled sensors Active CN204028288U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104714157A (en) * 2015-02-04 2015-06-17 国家电网公司 High-sensitivity spiral capacity coupling sensor and installing method thereof
CN104950231A (en) * 2015-05-29 2015-09-30 广西电网有限责任公司电力科学研究院 Cable insulation partial discharge defect and insulation state voltage resistance testing method and device
CN106483430A (en) * 2015-08-26 2017-03-08 斯凯孚公司 By the Partial Discharge Detection bandspreading of input signal aliasing
CN110618351A (en) * 2019-09-27 2019-12-27 湖南大学 Capacitance sensor and detection device
CN110945370A (en) * 2017-07-24 2020-03-31 赖茵豪森机械制造公司 Method and test device for measuring partial discharge pulses of shielded cable
CN111812392A (en) * 2020-06-05 2020-10-23 深圳供电局有限公司 Overvoltage detection circuit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104714157A (en) * 2015-02-04 2015-06-17 国家电网公司 High-sensitivity spiral capacity coupling sensor and installing method thereof
CN104714157B (en) * 2015-02-04 2018-11-06 国家电网公司 A kind of capacitive coupled sensors and installation method of high sensitivity helical form arrangement
CN104950231A (en) * 2015-05-29 2015-09-30 广西电网有限责任公司电力科学研究院 Cable insulation partial discharge defect and insulation state voltage resistance testing method and device
CN106483430A (en) * 2015-08-26 2017-03-08 斯凯孚公司 By the Partial Discharge Detection bandspreading of input signal aliasing
CN106483430B (en) * 2015-08-26 2020-11-06 Avo公司 Partial discharge detection band extension by input signal aliasing
CN110945370A (en) * 2017-07-24 2020-03-31 赖茵豪森机械制造公司 Method and test device for measuring partial discharge pulses of shielded cable
CN110945370B (en) * 2017-07-24 2022-05-31 赖茵豪森机械制造公司 Method and test device for measuring partial discharge pulses of shielded cable
CN110618351A (en) * 2019-09-27 2019-12-27 湖南大学 Capacitance sensor and detection device
CN111812392A (en) * 2020-06-05 2020-10-23 深圳供电局有限公司 Overvoltage detection circuit

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