CN108494107A - A kind of induction type electricity-fetching method for three-core cable - Google Patents
A kind of induction type electricity-fetching method for three-core cable Download PDFInfo
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- CN108494107A CN108494107A CN201810283048.6A CN201810283048A CN108494107A CN 108494107 A CN108494107 A CN 108494107A CN 201810283048 A CN201810283048 A CN 201810283048A CN 108494107 A CN108494107 A CN 108494107A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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Abstract
The present invention relates to a kind of induction type electricity-fetching methods for three-core cable, belong to electromagnetic energy collection method technical field.Technical solution is：1. at three magnetic field extreme points of the same cross section in three-core cable surface, coil is installed respectivelyc 1、c 2、c 3, spatially mutual deviation Di is uniformly wound on the bracelet ring skeleton of two semi-annulars these three coils by 120 degree, and ensures that these three coils are collimated with A, B, C three-phase core wire of the cable respectively；2. by three coilsc 1、c 2、c 3The voltage that induction generates carries out full-wave rectification respectively, and completes the conversion of AC/DC, obtains output voltage；3. using capacitor, the DC voltage of full-wave rectifying circuit output is filtered, then, the D/C voltage exported after filtering is supplied to energy-storage module.The present invention can both solve the power supply problem of distributed sensor networks in cable passage or other similar monitoring or detection or monitoring device and network provide a kind of new method of supplying power to, have extensive practical value.
Description
Technical field
The present invention relates to a kind of induction type electricity-fetching methods for three-core cable, belong to electromagnetic energy collection method technology neck
Domain.
Background technology
In recent years, power grid intelligence becomes the trend of power system development.Advanced sensor technology can be intelligence electricity
Net provides the on-line monitoring information of each node of electric system, is one of key technology of intelligent grid.With intelligent grid
Development, sensing network（Sensor Networks, SN）More and more applications are obtained in the power system.It passes through in power train
Each key node of uniting largely installs sensor, to realize the real-time monitoring to Operation of Electric Systems situation.
Cable power transmission is generally used for that the occasion of overhead line transmission of electricity cannot or should not be used, such as to big city center feed
Deng.With the continuous promotion of China's level of urbanization, cable power transmission is fast-developing.For ensure electric system operational safety, ten
Necessity is divided to be monitored on-line to the operating status of power transmission cable with sensor.
The monitoring sensor installed in cable passage and at cable termination tower, needed for working power, generally by feeling
Electricity getting device is answered to couple the DC of 12 ~ 15V of output from the single-phase joint of power cable busbar（Direct current）Voltage provides, Huo Zheyou
Lithium battery provides, or passes through the offers such as photovoltaic panel again.But the mode that electricity is taken from cable connector, is only available for single-core cable
Situation；The three-core cable of same shielding protection layer is used in conjunction with for three-phase core wire, due to its in steady-state operation three-phase current
The sum of be zero, traditional induction way to take power is simultaneously not suitable for.And battery powered is used, the periodic maintenance and replacement of battery will become
One very stubborn problem.In addition, in very moist cable passage, the service life of battery is also limited, and is easy to make
At environmental pollution.
To solve the problems, such as that environment residing for distributed sensor networks is very extensive, the more complicated power supply difficulty faced, research
Person begins to focus on and finds the auxiliary or alternative solution of battery, that is, wish to find it is a kind of it is sustainable, without manual maintenance, to environment
Friendly power supply mode.Wherein, collection of energy（Energy Harvesting）Technology starts to be paid close attention to by researcher in recent years.
Collection of energy, be it is a kind of existing collection of energy will be distributed in surrounding space, and be converted into can using
A kind of technology of electric energy.It realizes and powers to low-power consumption sensor by way of collecting, obtaining the energy of distribution in space
Purpose.Since energy collection technology can provide good electric energy for sensor, and its service life is compared to foot for battery
It is enough long, so, it is expected to fundamentally solve the powerup issue of sensor network work.
Invention content
It is an object of the present invention to provide a kind of induction type electricity-fetching methods for three-core cable, using collection of energy（Energy
Harvesting）Technology collects the magnetic field energy that three-core cable surface near space is distributed, and is converted into workable
Electric energy efficiently solves the above problem present in background technology.
The technical scheme is that：A kind of induction type electricity-fetching method applied to three-core cable comprises the steps of：①
At three magnetic field extreme points of the same cross section in three-core cable surface, coil is installed respectivelyc 1、c 2、c 3, these three coils are in sky
Between upper mutual deviation 120 degree Di be uniformly wound on the bracelet ring skeleton of two semi-annulars, and ensure these three coils respectively with this
A, B, C three-phase core wire of cable collimate（Successively to just）；2. by three coilsc 1、c 2、c 3The voltage that induction generates carries out entirely respectively
Wave rectification, and the conversion of AC/DC is completed, then, three DC voltages after rectification are added, you can obtain output voltage；
3. using capacitor, the DC voltage of full-wave rectifying circuit output is filtered, then, the D/C voltage exported after filtering is carried
Energy-storage module is supplied, the electric energy storage to collect, and converge and be converted into is in the capacitor；4. energy-storage module is according to sensor
The needs of real work control the release of electric energy.
Coil array is designed using two halves circular ring type, i.e., the interface of two semicircular rings is perpendicular PP', in machinery
On, apply at P or P' and is mechanically fixed.
The energy storage situation phase of the cyclic process of suspend mode, the work of sensor and magnetic induction intensity and energy-storage module at node
Matching.
Coilc 1、c 2、c 3, use core nominal diameter for 0.03 mm（Millimeter）Fine enamelled wire do multiturn uniform winding,
Maximum outside diameter is 0.045 mm, and on thickness, per cm can be 222 circles around the number of turns.
The beneficial effects of the invention are as follows：By obtaining the magnetic field energy being distributed in space, by three-core cable surrounding space point
The magnetic field energy of cloth is collected, convergence gets up, and is converted into workable electric energy, for sensor, data transmission unit etc.
Power supply.In this way, can both solve distributed sensor networks in cable passage power supply problem or other similar monitoring,
Detection or monitoring device and network provide a kind of new method of supplying power to, have extensive practical value.
Description of the drawings
Fig. 1 is coil distribution and the assembly schematic diagram of the present invention；
Fig. 2 is the low-voltage collection of energy management circuit diagram based on collection of energy；
Fig. 3 is three core power cable structural schematic diagrams；
Fig. 4 is to carry out electromagnetic finite element to emulate the model schematic used；
Fig. 5 is three DC voltages after full-wave rectificationu a(t)、u b(t)、u c(t) and the voltage that obtains after being superimposed themu(t) characteristic curve that changes over time；
In figure：It is mechanically fixed 1, is mechanically fixed 22, energy-storage module 3.
Specific implementation mode
Below in conjunction with attached drawing, by embodiment, the invention will be further described.
A kind of induction type electricity-fetching method applied to three-core cable comprises the steps of：1. same on three-core cable surface
At three magnetic field extreme points of cross section, coil is installed respectivelyc 1、c 2、c 3, spatially 120 degree of ground of mutual deviation are equal for these three coils
It is even to be wound on the bracelet ring skeleton of two semi-annulars, and ensure these three coils respectively with A, B, C three-phase core of the cable
Line collimates（Successively to just）；2. by three coilsc 1、c 2、c 3The voltage that induction generates carries out full-wave rectification respectively, and completes
Then three DC voltages after rectification are added, you can obtain output voltage by the conversion of AC/DC；3. capacitor is used, it is right
The DC voltage of full-wave rectifying circuit output is filtered, and then, the D/C voltage exported after filtering is supplied to energy-storage module, from
And by collection, the storage of the electric energy that converges and be converted into the capacitor；4. energy-storage module according to the needs of sensor real work,
Control the release of electric energy.
Coil array is designed using two halves circular ring type, i.e., the interface of two semicircular rings is perpendicular PP', in machinery
On, apply at P or P' and is mechanically fixed.
The energy storage situation phase of the cyclic process of suspend mode, the work of sensor and magnetic induction intensity and energy-storage module at node
Matching.
Coilc 1、c 2、c 3, use core nominal diameter for 0.03 mm（Millimeter）Fine enamelled wire do multiturn uniform winding,
Maximum outside diameter is 0.045 mm, and on thickness, per cm can be 222 circles around the number of turns.
As shown in Figure 1, at three magnetic field extreme points of the same cross section in three-core cable surface, coil is installed respectivelyc 1、c 2、c 3.Spatially mutual deviation Di is uniformly wound on the bracelet ring skeleton of two semi-annulars these three coils by 120 degree, and is ensured
These three coils are collimated with A, B, C three-phase core wire of the cable respectively（Successively to just）.
According to the law of electromagnetic induction, the coil collimated with A, B, C three-phase core wire, the electromotive force induced thereon is respectively
Wherein, u a(t) it is the coil collimated with A phase core wiresc 1The function that the electromotive force that upper induction generates changes over time；u b(t)
For the coil collimated with B phase core wiresc 2The function that the electromotive force that upper induction generates changes over time；u c(t) it is to be collimated with C phase core wires
Coilc 3The function that the electromotive force that upper induction generates changes over time；NFor the number of turns of each coil；SFor the sectional area of coil；B a(t) it is coilc 1The function that the tangential component of the magnetic induction intensity at place changes over time；B b (t) it is coilc 2The magnetic induction at place
The function that changes over time of intensity tangential component；B c(t) it is coilc 3The tangential component of the magnetic induction intensity at place changes over time
Function.
As shown in Fig. 2, by three coilsc 1、c 2、c 3The voltage that induction generates carries out full-wave rectification respectively, and completes AC/
The conversion of DC.Then, three DC voltages after rectification are added, you can obtain output voltage.The output changed over time
Voltageu(t) may be characterized as
Using capacitor, the DC voltage of full-wave rectifying circuit output is filtered, then, the D/C voltage that will be exported after filtering
It is supplied to energy-storage module, the electric energy storage to collect, and converge and be converted into is in the capacitor.Due to low-power consumption sensor without
Working condition need to be had been at, so, can according at node magnetic induction intensity and energy-storage module collect, converge and be converted into
The cyclic process of suspend mode, the work of sensor is reasonably arranged in the concrete condition of electric energy.Energy-storage module can be according to sensor reality
Requirements of one's work control the release of electric energy.
In order to verify the feasibility of the technical solution, the emulation data of one group of collection of energy are provided here.According to 35kV tri-
Every simulation parameter setting of the actual state of core cable power transmission operation, three-core cable is as follows：Three-core cable radiusR=45mm, three
Distance of the phase core wire center to cable centerr 1=r 2=r 3=20mm, the electric current of three-phase core wireI A=I B=I C=200A, three core electric power electricity
The structure of cable is as shown in Figure 3.
For coilc 1、c 2、c 3, multiturn uniform winding is done using fine enamelled wire.According to domestic enameled wire specifications and models table,
Use core nominal diameter for the enameled wire of 0.03 mm, maximum outside diameter is 0.045 mm, per cm to be around the number of turns on thickness
222 circles.If the length of single coil is 2cm, each coil winds 20 layers, then the number of turns of single coilNAbout 8000 circles.It enables
The radius of coil is 1cm, then the sectional area of coil is about 3 cm2.Electromagnetic finite element emulates the three-core cable and coil used
Model it is as shown in Figure 4.
It is emulated through electromagnetic finite element, 3 coils is calculatedc 1、c 2、c 3The voltage that upper induction generates, through full-wave rectification
Waveform afterwards is as shown in Figure 5.The peak value for the induced voltage that single coil generates is about 0.55V, which can meet germanium two
The requirement of pole pipe forward conduction, it is ensured that full-wave rectifying circuit works normally.It, can be in fact, when collecting magnetic field energy
According to specific needs, it takes and the methods of increases coil turn, increases area coil to increase the peak value for the voltage that induction generates.
Fig. 5 also gives the voltage after 3 DC voltage superpositionsu(t) waveform.From fig. 5, it can be seen that the simulation example
In, after full-wave rectification and superposition, the average value of acquired pulsating dc voltage is about the voltage of 3 coil-induced generations
1.05V；Also, the ripple peak-to-peak value of the pulsating dc voltage after being superimposed is about 0.1V, the pulsation electricity with the output of single rectifier bridge
Pressure is compared, and ripple voltage has been obviously reduced, that is, has had preferable quality of voltage, this also demonstrates patent of the present invention and is provided
The feasibility of method.
Claims (4)
1. a kind of induction type electricity-fetching method for three-core cable, it is characterised in that comprise the steps of：1. in three-core cable table
At three magnetic field extreme points of the same cross section in face, coil is installed respectivelyc 1、c 2、c 3, these three coils spatially mutual deviation 120
Degree ground be uniformly wound on the bracelet ring skeleton of two semi-annulars, and ensure these three coils respectively with A, B, C of the cable
Three-phase core wire collimates；2. by three coilsc 1、c 2、c 3The voltage that induction generates carries out full-wave rectification respectively, and completes AC/DC
Conversion, then, by after rectification three DC voltages be added, you can obtain output voltage；3. capacitor is used, it is whole to all-wave
The DC voltage of current circuit output is filtered, and then, the D/C voltage exported after filtering is supplied to energy-storage module, to receive
The electric energy storage for collecting, converging and be converted into is in the capacitor；4. energy-storage module is according to the needs of sensor real work, control electricity
The release of energy.
2. a kind of induction type electricity-fetching method for three-core cable according to claim 1, it is characterised in that：Coil array
It being designed using two halves circular ring type, i.e., the interface of two semicircular rings is perpendicular PP', mechanically, the application machine at P or P'
Tool is fixed.
3. a kind of induction type electricity-fetching method for three-core cable according to claim 1, it is characterised in that：Sensor
Suspend mode, the cyclic process of work and the energy storage situation of magnetic induction intensity and energy-storage module at node match.
4. a kind of induction type electricity-fetching method for three-core cable according to claim 1, it is characterised in that：Coilc 1、c 2、c 3, use core nominal diameter to do multiturn uniform winding for the fine enamelled wire of 0.03 mm, maximum outside diameter is 0.045 mm, thick
On degree, per cm can be 222 circles around the number of turns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810283048.6A CN108494107A (en) | 2018-04-02 | 2018-04-02 | A kind of induction type electricity-fetching method for three-core cable |
Applications Claiming Priority (1)
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| CN201810283048.6A CN108494107A (en) | 2018-04-02 | 2018-04-02 | A kind of induction type electricity-fetching method for three-core cable |
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| Publication Number | Publication Date |
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| CN108494107A true CN108494107A (en) | 2018-09-04 |
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| CN201810283048.6A Pending CN108494107A (en) | 2018-04-02 | 2018-04-02 | A kind of induction type electricity-fetching method for three-core cable |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765464A (en) * | 2018-12-14 | 2019-05-17 | 福建和盛高科技产业有限公司 | Partial discharge monitoring device in a kind of 10kV distribution cable transition joint |
| CN110031724A (en) * | 2019-04-30 | 2019-07-19 | 广州供电局有限公司 | Distribution cable medial head monitoring device |
| CN111948488A (en) * | 2020-07-23 | 2020-11-17 | 广东电网有限责任公司 | Distribution cable fault monitoring system and use method |
| CN113589021A (en) * | 2021-07-19 | 2021-11-02 | 武汉三相电力科技有限公司 | Electricity taking system and method for three-core cable |
| CN113746214A (en) * | 2021-08-31 | 2021-12-03 | 西安交通大学 | Power supply circuit for three-core cable thermal state online monitoring system |
| CN114865801A (en) * | 2022-05-18 | 2022-08-05 | 华北电力大学 | High-energy-density magnetic field energy collecting device and system for three-core cable |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765464A (en) * | 2018-12-14 | 2019-05-17 | 福建和盛高科技产业有限公司 | Partial discharge monitoring device in a kind of 10kV distribution cable transition joint |
| CN110031724A (en) * | 2019-04-30 | 2019-07-19 | 广州供电局有限公司 | Distribution cable medial head monitoring device |
| CN110031724B (en) * | 2019-04-30 | 2024-04-30 | 广东电网有限责任公司广州供电局 | Distribution cable middle head monitoring device |
| CN111948488A (en) * | 2020-07-23 | 2020-11-17 | 广东电网有限责任公司 | Distribution cable fault monitoring system and use method |
| CN113589021A (en) * | 2021-07-19 | 2021-11-02 | 武汉三相电力科技有限公司 | Electricity taking system and method for three-core cable |
| CN113746214A (en) * | 2021-08-31 | 2021-12-03 | 西安交通大学 | Power supply circuit for three-core cable thermal state online monitoring system |
| CN113746214B (en) * | 2021-08-31 | 2024-05-07 | 西安交通大学 | Power supply circuit for three-core cable thermal state on-line monitoring system |
| CN114865801A (en) * | 2022-05-18 | 2022-08-05 | 华北电力大学 | High-energy-density magnetic field energy collecting device and system for three-core cable |
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