CN106199357A - A kind of recombination current sensor of XLPE power cable in switch cubicle - Google Patents
A kind of recombination current sensor of XLPE power cable in switch cubicle Download PDFInfo
- Publication number
- CN106199357A CN106199357A CN201610584512.6A CN201610584512A CN106199357A CN 106199357 A CN106199357 A CN 106199357A CN 201610584512 A CN201610584512 A CN 201610584512A CN 106199357 A CN106199357 A CN 106199357A
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- China
- Prior art keywords
- cable
- current sensor
- coil
- zero sequence
- magnetic core
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to a kind of recombination current sensor of XLPE power cable in switch cubicle, to integrate zero sequence current mutual inductor and HF current transformer as core, critical piece is annular magnet, line-frequency induction coil, radio-frequency induction coil and shell secondary terminals etc..It is high frequency coil and the magnetic core of line-frequency induction coil that the present invention chooses Ferrite Material.Two coils are wound on magnetic core respectively, and simultaneously by epoxy encapsulation, two hub of a spool frequencies are different with bandwidth, do not influence each other during normal work.
Description
Technical field
Patent of the present invention belongs to converting equipment live monitoring field, relates to power cable, especially in power switch cabinet
XLPE power cable partial discharge monitoring method.
Background technology
Along with partial cross-linked polyethylene (XLPE) power cable runs being gradually increased of time；By cable accessory and cable
The electric power accident that body insulation fault causes also constantly is increasing, and especially has an accident as many with cable accessory.
Shelf depreciation in monitoring XLPE cable can well reflect the state of insulation of cable, domestic and international experts and scholars and
International Power authoritative institution unanimously thinks that partial discharge test is the best approach of XLPE power cable insulation status evaluation.So
And, before domestic cable local discharge on-line monitoring technique is started in the more than ten years, how inline diagnosis cable and the insulation of adnexa thereof
Situation, finds potential faults in time, has very important realistic meaning.
When XLPE cable insulating inner existing defects, the generation of shelf depreciation can be caused.When shelf depreciation occurs, meeting exists
Pulse current is produced in cable.Therefore, the monitoring method that XLPE cable office puts has a kind of high frequency electric method.High frequency electric method is direct
Pulse current when shelf depreciation occurs in monitoring cable, can reflect the features such as impulse waveform, more truly by extensively
Research and application.
The principle of high frequency electric method monitoring XLPE cable shelf depreciation is, by High Frequency Current Sensor (Rogowsky line
Circle) it is placed on cable termination side, allow cable cover the earth lead of layer or unscreened single-phase cable passes, pulse is put in coil coupling office
The electromagnetic field signal produced around electric current, monitors XLPE cable local discharge signal.The Observational frequency band of high frequency electric method is usual
Between tens kHz to tens MHz, it is possible to effectively obtain the pulsed current signal of shelf depreciation, High Frequency Current Sensor is pacified
Dress simplicity, is the monitoring method of a kind of non-intrusion type, safe and reliable.At present, apply also in conceptual phase in switch cubicle, and
Switch cubicle inner structure is compact, and the installation site of High Frequency Current Sensor do not reserved by the switch cubicle run.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, invented one and combined HF current transformer and zero
The recombination current sensor of sequence current transformer.This sensor monitors power current and high frequency electric simultaneously, and easy for installation, no
Change switch cubicle inner structure, it is possible to install in existing switch cubicle, it is achieved power cable partial discharge monitoring and power frequency are little
Signal code is monitored.Facilitate operation maintenance personnel to make an inspection tour, ensure switch cubicle health failure-free operation.
The present invention solves technical problem and be the technical scheme is that
A kind of recombination current sensor of XLPE power cable in switch cubicle, including magnetic core, HF current transformer
Coil, zero sequence current mutual inductor coil, the HF current transformer coil that the coiling number of turn is less on magnetic core, line footpath is thick, high frequency
Current mutual inductor coil is drawn by coaxial cable, and on the outside magnetic core of HF current transformer coil, the coiling number of turn is many, line
The zero sequence current mutual inductor coil that footpath is thin, zero sequence current mutual inductor coil is drawn by wire, at zero sequence current mutual inductor coil
Outside casting epoxy resin.
A kind of installation method of the recombination current sensor of XLPE power cable in switch cubicle, by compound sensor set
It is connected on XLPE cable terminal cable crotch, avoids cable shielding layer earthing line.
The present invention to integrate zero sequence current mutual inductor and HF current transformer as core, critical piece be annular magnet,
Line-frequency induction coil, radio-frequency induction coil and shell secondary terminals etc..It is high frequency coil and power frequency sense that the present invention chooses ferrite
Answer the magnetic core of coil.Two coils are wound on magnetic core respectively, and simultaneously by epoxy encapsulation, two hub of a spool frequencies are not
With, do not influence each other during normal work.
(1) this project by being connected on XLPE cable terminal cable crotch by recombination current sensor sleeve, avoids cable screens
Cover a layer earth lead, for the monitoring method of a kind of non-intrusion type, safe and reliable.The method overcome supercritical ultrasonics technology, hyperfrequency method etc.
The shortcoming that can not monitor cable total length, and strong interference immunity, can reflect Partial Discharge more truly.
(2) in order to improve High Frequency Current Sensor performance, after determining coil bandwidth, need to choose magnetic material, herein
Intend choosing manganese-zinc ferrite or nickel-zinc ferrite is current sensor magnetic core.
(3) HF current transformer and zero sequence current mutual inductor are integrated by recombination current sensor, it is to avoid switch
Cabinet in the case of not reserving high frequency sensors installation site, the problem of High Frequency Current Sensor installation difficulty, simultaneously maximum limit
Degree is XLPE cable joint area, sensitive monitoring in switch cubicle.
(4) High Frequency Current Sensor lead-out wire is the single-core cable of band shielding, mates impedance 50 ohm, zero sequence current mutual inductance
Device lead-out wire is common copper conductor.
Advantages of the present invention and good effect be:
1, this recombination current sensor solves operation maintenance personnel to XLPE power cable on-line monitoring difficulty in switch cubicle
Problem, overcomes existing infrared, ultraviolet, defect that ultrasonic, superfrequency technology is monitored, effectively monitors the strong of power cable
Health situation, it is to avoid power failure that in switch cubicle, power cable causes because of insulation fault and major accident.
2, this recombination current Fundamentals of Sensors are simple, by making answering of HF current transformer and zero sequence current mutual inductor
Close current sensor, install simple, do not change switch cubicle inner structure.After installing, it is possible to it is right to realize in the case of not having a power failure
The partial discharge monitoring of power cable in switch cubicle, has ensured the healthy trouble-free operation of power cable.
The electrical equipment that 3.XLPE cable local discharge on-line monitoring system improves to a certain extent intelligent, substitutes
The tour to cable of the common operation maintenance personnel, save substantial amounts of labour force, and have higher accuracy, carry for stablizing of electrical network
For ensureing.
Accompanying drawing explanation
Fig. 1 is the structure chart of recombination current sensor；
Fig. 2 is recombination current sensor mounting location figure.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings and by specific embodiment, and following example are descriptive
, it not determinate, it is impossible to limit protection scope of the present invention with this.
This recombination current sensor using FERRITE CORE 1 as the magnetic core of recombination current sensor, on magnetic core first around
The HF current transformer coil 3 that the number of turn processed is less, line footpath is thicker, after making coil, draws coil coaxial cable 4,
The zero sequence current mutual inductor coil 2 that the coiling number of turn is many outside coil, line footpath is thin, after making, draws with plain conductor 5.?
With epoxy resin, recombination current transformer is poured afterwards.Protection coil within transformer.The lead-out wire of zero sequence current mutual inductor
For zero-sequence current secondary line；Coaxial cable is HF current transformer lead-out wire.
The installation of this recombination current sensor such as Fig. 2,6 is a certain phase joint of cable termination, and 7 divide for threephase cable joint
At fork, being socketed in by compound sensor on the downside of cable connector crotch, the earth lead 8 drawn by crotch is through composite sensing
Device, zero-sequence current secondary lead-out wire can measure cable zero-sequence current；HF current transformer lead-out wire can measure local in cable
The pulsed current signal that electric discharge produces.
During described compound sensor fault, do not affect the properly functioning of power cable line.
The present invention, through laboratory test, complies fully with " State Grid Corporation of China's electric power safety working regulation (power transformation part) "
In requirement, can apply at the scene.
Above-described is only the preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, on the premise of without departing from inventive concept, it is also possible to make some deformation and improvement, these broadly fall into the protection of the present invention
Scope.
Claims (5)
1. the recombination current sensor of XLPE power cable in switch cubicle, it is characterised in that: include magnetic core, high-frequency electrical
Current transformer coil, zero sequence current mutual inductor coil, the HF current transformer line that the coiling number of turn is few on magnetic core, line footpath is thick
Enclosing, HF current transformer coil is drawn by coaxial cable, coiling circle on the outside magnetic core of HF current transformer coil
The zero sequence current mutual inductor coil that number is many, line footpath is thin, zero sequence current mutual inductor coil is drawn by wire, at zero sequence current mutual inductance
Casting epoxy resin outside device coil.
Recombination current sensor the most according to claim 1, it is characterised in that: described wire is zero sequence current mutual inductor
Secondary line, for copper conductor.
Recombination current sensor the most according to claim 1, it is characterised in that: described magnetic core is manganese-zinc ferrite or nickel
Zn ferrite.
Recombination current sensor the most according to claim 1, it is characterised in that: described coaxial cable is the list of band shielding
Core cable, mates impedance 50 ohm.
5. the installation method of the recombination current sensor of XLPE power cable in switch cubicle, it is characterised in that: will be multiple
Close current sensor and be socketed in XLPE cable terminal cable crotch, avoid cable shielding layer earthing line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610584512.6A CN106199357A (en) | 2016-07-20 | 2016-07-20 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610584512.6A CN106199357A (en) | 2016-07-20 | 2016-07-20 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106199357A true CN106199357A (en) | 2016-12-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610584512.6A Pending CN106199357A (en) | 2016-07-20 | 2016-07-20 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
Country Status (1)
| Country | Link |
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| CN (1) | CN106199357A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253071A (en) * | 2021-05-24 | 2021-08-13 | 全球能源互联网研究院有限公司 | Current sensor and cable state monitoring device based on magnetic resistance effect |
| CN114577331A (en) * | 2019-12-23 | 2022-06-03 | 成都高斯电子技术有限公司 | Application of sensor preparation liquid in cable defect treatment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009058428A (en) * | 2007-08-31 | 2009-03-19 | Toyo Networks & System Integration Co Ltd | Insulation monitor |
| CN201562027U (en) * | 2009-11-25 | 2010-08-25 | 福建和盛高科技产业有限公司 | Composite current transformer and on-line detection device for lightning arrester |
| CN102708649A (en) * | 2012-06-12 | 2012-10-03 | 严俊辉 | Multifunctional electrical safety detector |
| CN202837471U (en) * | 2012-06-15 | 2013-03-27 | 湖南湘能智能电器股份有限公司 | Low-current grounding system single-phase earth fault wire discrimination device |
| CN203894344U (en) * | 2014-04-01 | 2014-10-22 | 国网山东垦利县供电公司 | Power cable line load and temperature monitoring device based on CT |
| CN204303543U (en) * | 2015-01-13 | 2015-04-29 | 北京新创四方电子有限公司 | The built-in Multifunctional electric current transformer of a kind of bus |
| CN205159029U (en) * | 2015-11-06 | 2016-04-13 | 广州擎天实业有限公司 | High -frequency impulse transformer |
-
2016
- 2016-07-20 CN CN201610584512.6A patent/CN106199357A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009058428A (en) * | 2007-08-31 | 2009-03-19 | Toyo Networks & System Integration Co Ltd | Insulation monitor |
| CN201562027U (en) * | 2009-11-25 | 2010-08-25 | 福建和盛高科技产业有限公司 | Composite current transformer and on-line detection device for lightning arrester |
| CN102708649A (en) * | 2012-06-12 | 2012-10-03 | 严俊辉 | Multifunctional electrical safety detector |
| CN202837471U (en) * | 2012-06-15 | 2013-03-27 | 湖南湘能智能电器股份有限公司 | Low-current grounding system single-phase earth fault wire discrimination device |
| CN203894344U (en) * | 2014-04-01 | 2014-10-22 | 国网山东垦利县供电公司 | Power cable line load and temperature monitoring device based on CT |
| CN204303543U (en) * | 2015-01-13 | 2015-04-29 | 北京新创四方电子有限公司 | The built-in Multifunctional electric current transformer of a kind of bus |
| CN205159029U (en) * | 2015-11-06 | 2016-04-13 | 广州擎天实业有限公司 | High -frequency impulse transformer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577331A (en) * | 2019-12-23 | 2022-06-03 | 成都高斯电子技术有限公司 | Application of sensor preparation liquid in cable defect treatment |
| CN114577331B (en) * | 2019-12-23 | 2024-04-12 | 成都高斯电子技术有限公司 | Application of sensor preparation liquid in cable defect treatment |
| CN113253071A (en) * | 2021-05-24 | 2021-08-13 | 全球能源互联网研究院有限公司 | Current sensor and cable state monitoring device based on magnetic resistance effect |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161207 |