CN104483571B - Cable insulation detection method - Google Patents
Cable insulation detection method Download PDFInfo
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- CN104483571B CN104483571B CN201410790700.5A CN201410790700A CN104483571B CN 104483571 B CN104483571 B CN 104483571B CN 201410790700 A CN201410790700 A CN 201410790700A CN 104483571 B CN104483571 B CN 104483571B
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Abstract
The invention discloses a kind of cable insulation detection method, collection cable load current Ia, cable voltage-to-ground Ua, cable metal overcoat earth terminal electric current If.Cable metal overcoat earth terminal electric current If includes cable earth capacitance electric current Ic, metal protection layer single-point or multipoint earthing circulation Ih, major insulation discharge current Ix, pass through phase bit comparison, waveform capture, and Fourier expansion, three kinds of electric currents Ic, Ih, Ix being included in cable metal overcoat earth terminal collection electric current If are extracted, if metal protection layer single-point or multipoint earthing circulation Ih reach setting value device alarm cable metal overcoat, one-point or multi-point are grounded, if major insulation discharge current Ix reaches setting value device alarm cable major insulation exception.
Description
Technical field
The present invention relates to cable detecting device field, specifically a kind of cable insulation detection method.
Background technology
Single-core cable overcoat in China's is grounded using one end more at present, and the other end is earth-free or high resistance ground, for cable
Major insulation or overcoat insulation against ground detect mainly or by preventive trial, there is presently no reason under on-line operation state
Think solution, indivedual producers use surface temperature measurement method, and because cable length and earth point ground connection situation are different, temperature is special
Sign can not can really react cable insulation failure.Also some carry out triphase parameter control methods using voltage-current relationship, only
Can be to that could be found during cable insulation very serious even failure, initial stage can not find that using effect is undesirable.
In the prior art, typically earth-current, three-phase current are compared by gathering earth terminal, if certain phase current and
The problem of other two-phases are variant, that is, judge this phase cable exception, and this measuring method is present is as follows：
1st, the electric current collected by earth terminal is actually the synthesis of three electric currents（Capacitance current, some multiple spot living connects
The circulation on ground, the leakage current of major insulation）And these three current phases and amplitude are widely different, three electric currents reflect electricity respectively
Three kinds of operation characteristics of cable, the current characteristic after only being synthesized with these three electric currents can not accurate judgement cable exception；
2nd, capacitance current is by the Abnormal Insulation outside whole system this cable due to being influenceed, it is single can not be accurate from resultant current
Really judge cable insulation exception.
The content of the invention is it is an object of the invention to provide a kind of cable insulation detection method, to solve existing for prior art
Problem.In order to achieve the above object, the technical solution adopted in the present invention is：
Cable insulation detection method, it is characterised in that：Gather cable load current Ia, cable voltage-to-ground Ua, cable gold
Belong to overcoat earth terminal electric current If, wherein cable metal overcoat earth terminal electric current If is by cable earth capacitance electric current Ic, metal
Overcoat single-point or multipoint earthing circulation Ih, major insulation discharge current Ix are formed, and are surpassed using cable earth capacitance electric current Ic phases
Preceding 90 degree of cable voltage-to-ground Ua phases, metal protection layer single-point or the advanced cable load current of multipoint earthing circulation Ih phases
Ia phases 180 degree, major insulation discharge current Ix phases and cable voltage-to-ground Ua same-phase identical characteristics, pass through phase property
Analysis, phase bit comparison, waveform capture, Fourier expansion are carried out successively, cable metal overcoat earth terminal is gathered in electric current If
Comprising cable earth capacitance electric current Ic, metal protection layer single-point or multipoint earthing circulation Ih, major insulation discharge current Ix extraction
Out, whether cable insulation can determine whether according to metal protection layer single-point or multipoint earthing circulation Ih and major insulation discharge current Ix
It is abnormal.
The present invention can accurately calculate the feature of each electric current of resultant current, according to the size of each electric current come accurate judgement electricity
Cable is abnormal.Pass through detection load electric current, system voltage, earth point electric current, using Waveform forecast and synthesis phase comparison method, by three
Kind size of current and characteristic parameter extraction come out, abnormal according to system voltage and load current comprehensive descision cable insulation.
Device can monitor major insulation leakage current, capacitance current, one-point or multi-point ground connection in real time during normal operation of the present invention
Circulation, dispatching terminal or Surveillance center, planned implementation power failure processing are uploaded according to Parameters variation Real-time Alarm and by parameter.
Brief description of the drawings
Fig. 1 is the present invention program schematic diagram.
Fig. 2 is waveform analysis figure.
Embodiment
Cable insulation detection method, collection cable load current Ia, cable voltage-to-ground Ua, cable metal overcoat ground connection
Hold electric current If, wherein cable metal overcoat earth terminal electric current If by cable earth capacitance electric current Ic, metal protection layer single-point or
Multipoint earthing circulation Ih, major insulation discharge current Ix are formed, electric over the ground using the advanced cable of cable earth capacitance electric current Ic phases
90 degree of pressure Ua phases, metal protection layer single-point or the advanced cable load current Ia phases 180 degree of multipoint earthing circulation Ih phases,
Major insulation discharge current Ix phases and cable voltage-to-ground Ua same-phase identical characteristics, are analyzed by phase property, entered successively
The bit comparison of row phase, waveform capture, Fourier expansion, cable metal overcoat earth terminal is gathered to the cable pair included in electric current If
Ground capacitance current Ic, metal protection layer single-point or multipoint earthing circulation Ih, major insulation discharge current Ix are extracted, according to metal
Overcoat single-point or multipoint earthing circulation Ih and major insulation discharge current Ix can determine whether cable insulation is abnormal.
As shown in figure 1, Fig. 1, which is A phases cable insulation, monitors schematic diagram on-line, B phases, C facies principle figures are identical, and three-phase concentrates on
One signal analysis and processing unit is handled.The KI ends of Current Transmit 1 are connected with device Ia* ends, current transformer
CT1 K2 ends are connected with device Ia ends；The Ua ends of voltage transformer pt are connected with the Ua ends of device, by voltage transformer pt
Un ends are connected with the Un ends of device；Earth terminal electric current will be grounded resultant current by precision current sensor CT2 and introduce signal
Acquisition module is grounded recombination current terminal, and polarity connects on request.
As shown in Fig. 2 by cable load current Ia waveforms, cable voltage-to-ground Ua waveforms, cable metal overcoat
Earth terminal electric current If waveforms, cable earth capacitance electric current Ic waveforms, metal protection layer single-point or multipoint earthing circulation Ih waveforms, master
Insulation discharge current Ix waveform analyses, can be accurately captured metal protection layer single-point or multipoint earthing circulation Ih waveforms, major insulation
Discharge current Ix waveform phase features.In terms of waveform analysis, the advanced cable voltage-to-ground Ua of cable earth capacitance electric current Ic phases
90 degree of phase, metal protection layer single-point or the advanced cable load current Ia phase 180 degrees of multipoint earthing circulation Ih phases, major insulation
Discharge current Ix phases are identical with cable voltage-to-ground Ua same-phases.By above-mentioned phase property, by phase bit comparison, waveform is caught
Catch, and Fourier expansion, cable metal overcoat earth terminal is gathered to the three kinds of electric currents included in electric current If（Ic、Ih、Ix）
Extract, if metal protection layer single-point or multipoint earthing circulation Ih reach setting value device alarm cable metal overcoat one
Point or multipoint earthing, if major insulation discharge current Ix reaches setting value device alarm cable major insulation exception.
Claims (1)
1. cable insulation detection method, it is characterised in that：Gather cable load current Ia, cable voltage-to-ground Ua, cable metal
Overcoat earth terminal electric current If, wherein cable metal overcoat earth terminal electric current If are prevented by cable earth capacitance electric current Ic, metal
Sheath single-point or multipoint earthing circulation Ih, major insulation discharge current Ix are formed, advanced using cable earth capacitance electric current Ic phases
90 degree of cable voltage-to-ground Ua phases, metal protection layer single-point or the advanced cable load current Ia phases of multipoint earthing circulation Ih phases
Position 180 degree, major insulation discharge current Ix phases and cable voltage-to-ground Ua phase identical characteristics, are analyzed by phase property,
Phase bit comparison, waveform capture, Fourier expansion are carried out successively, and cable metal overcoat earth terminal is gathered what is included in electric current If
Cable earth capacitance electric current Ic, metal protection layer single-point or multipoint earthing circulation Ih, major insulation discharge current Ix are extracted, root
It can determine whether cable insulation is abnormal according to metal protection layer single-point or multipoint earthing circulation Ih and major insulation discharge current Ix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790700.5A CN104483571B (en) | 2014-12-17 | 2014-12-17 | Cable insulation detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790700.5A CN104483571B (en) | 2014-12-17 | 2014-12-17 | Cable insulation detection method |
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| CN104483571A CN104483571A (en) | 2015-04-01 |
| CN104483571B true CN104483571B (en) | 2017-11-10 |
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| CN201410790700.5A Active CN104483571B (en) | 2014-12-17 | 2014-12-17 | Cable insulation detection method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710016B (en) * | 2018-03-01 | 2019-10-18 | 华南理工大学 | A Calculation Method of Distributed Capacitive Current in Single Core Cable Containing Insulated Gold Cloth |
| CN110412418B (en) * | 2019-07-22 | 2020-07-31 | 国网湖北省电力有限公司电力科学研究院 | Diagnosis and Locating Method of Insulation Tube Busbar Insulation Based on Grounding Current Measurement |
| CN113295977B (en) * | 2021-06-03 | 2022-03-15 | 长沙理工大学 | Cable insulation state and fault monitoring method |
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| CN103336230A (en) * | 2013-06-21 | 2013-10-02 | 国家电网公司 | Device and method for predicting cable insulation failure rate in power distribution network |
| CN103630814A (en) * | 2013-12-11 | 2014-03-12 | 国家电网公司 | Insulating dielectric loss angle tendency online monitoring method of high-voltage cables under cross interconnection |
| CN103941161A (en) * | 2014-05-12 | 2014-07-23 | 国家电网公司 | On-line monitoring system for current and carrying capacity of cable sheath |
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- 2014-12-17 CN CN201410790700.5A patent/CN104483571B/en active Active
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| CN201229389Y (en) * | 2008-07-24 | 2009-04-29 | 福建省泉州电业局 | Cable sheath insulation on-line monitoring device |
| CN101825657A (en) * | 2010-05-12 | 2010-09-08 | 国网电力科学研究院 | Medium-high voltage single-core crosslinked cable induction voltage and circular-current online detection method and device |
| CN103336230A (en) * | 2013-06-21 | 2013-10-02 | 国家电网公司 | Device and method for predicting cable insulation failure rate in power distribution network |
| CN103630814A (en) * | 2013-12-11 | 2014-03-12 | 国家电网公司 | Insulating dielectric loss angle tendency online monitoring method of high-voltage cables under cross interconnection |
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Effective date of registration: 20171102 Address after: 230088 building, B6 building, 168 science and Technology Industrial Park, 2 camphor Road, hi tech Zone, Hefei, Anhui Patentee after: Hefei Ruida Software Technology Co., Ltd. Address before: 230022 Hefei, Anhui, South Road, cooperative building, No. 28, 11F Patentee before: ANHUI TARY TONGDA MECHANICAL & ELECTRICAL CO., LTD. |