CN104979853B - Power transmission line sectioned insulating overhead ground wire multi-point power accessing system based on electromagnetic induction - Google Patents
Power transmission line sectioned insulating overhead ground wire multi-point power accessing system based on electromagnetic induction Download PDFInfo
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Abstract
The invention provides a power transmission line sectioned insulating overhead ground wire multi-point power accessing system based on electromagnetic induction. The system comprises an impact protection unit, a processing circuit and a monitoring unit, wherein the input end of the impact protection unit is respectively connected with an iron tower and a sectioned insulating overhead ground wire, the output end of the impact protection unit is connected with the input end of the processing circuit, and the monitoring unit is connected with the processing circuit to adjust the output voltage scope according to setting. The system allows directly accessing power from an earthed overhead ground wire, solves the insulation problem, and is suitable for monitor equipment on ground potential. The system has high engineering application value, and can be widely promoted. The system limits adverse influence on load supply voltage by fluctuation of ground wire voltage or current, and ensures safe use. A super capacitor is employed to power loads, which ensures sufficient service power and power time for loads during a power-off time. The system is also maintenance-free and is width in operational temperature range and long in service lifetime.
Description
Technical field
The present invention relates to power domain, more particularly to a kind of transmission line of electricity graded insulation aerial earth wire based on electromagnetic induction
Multiple spot energy obtaining system.
Background technology
With the continuous improvement for distributing requirement rationally to electrical network self-healing ability and power resource both at home and abroad, novel intelligent electrical network
Concept widely paid close attention to.Based on modern transmission and distribution network can only electrical network.Set up in the logical of integrated and high-speed bidirectional
On communication network platform, the advanced sensing of integrated application and measurement, computer, microelectronics, power electronics, control and intelligent decision
Etc. technology, using electrical network real time panoramic information, carry out monitor in real time, catastrophe protection and user interaction, with realize reliable, safety,
Economy, high-quality, efficient operation of power networks and sustainable development.Transmission line online monitoring system is used as intelligent grid power transmission and transformation ring
The important component part of section, is to realize the management of power transmission and transformation equipment state operating maintenance, lift normal operation lean level
Important means.Power transmission network covers wide, and maintenance workload is big, and overhead transmission line once goes wrong will be to state's people's livelihood
Product causes significant impact, and power grid self-healing and adaptive requirement, need power department to control transmission line of electricity operation in real time
State find in time, quick diagnosis and eliminate potential faults, it is to avoid the generation of large area accident.In this case, it is just urgent
Need to set up transmission line online monitoring system, be that solid foundation is established in the reliability service of transmission line of electricity and maintenance in time.
Overhead transmission line on-line monitoring technique, has continuous, timely reflection transmission line status letter with respect to manual inspection
The advantages of breath, according to the preliminary statistics, both at home and abroad transmission line of electricity on-line monitoring technique is widely used in monitoring system at present
Remote transfer signal relay, shaft tower is inclined, lead, uniaxial stress, the field such as route inspecting robot.Transmission line of electricity on-line monitoring dress
Put installation in the wild, limited by geographical conditions or insulation conditions, its power supply typically can not be directly fed by low-pressure end, existing
In terms of power supply mode also has various Technological Economies, under the trend that China greatly develops intelligent grid, it is impossible to fully
Meet the power demands of on-Line Monitor Device.According to a statistics of Sichuan province, because of transmission line of electricity caused by electricity shortage
On-line monitoring failure accounts for more than the 40% of total failare.It is further that energy supply problem becomes restriction transmission line of electricity on-line monitoring technique
The bottleneck of development.
The energy mode that takes of current power transmission circuit on-Line Monitor Device has：Solar energy+battery, wind energy+battery, power transmission line
Road takes online can wait.
Wherein, solar electric power supply system generally comprises silicon solar cell, batteries and charge-discharge control circuit three
Part.Silicon solar cell only could generate electricity in illumination, not possess the ability for preserving electric energy, in order to the power supply for obtaining stable it is defeated
Go out, it is ensured that can power to the load incessantly, it is desirable to have battery is connected in parallel (silicon solar cell pair with silicon solar cell
Battery is charged).When illumination is sufficient, silicon solar cell one side powers to the load, and one charges in the face of battery, and illumination is not enough
Period is then powered to the load by battery.Battery can select lead-acid accumulator, lithium battery, Ni-MH battery and nickel iron cell.
The control conversion of solar electric power supply system different working condition and corresponding management strategy are by SCM Based charge-discharge control
Circuit processed is realizing.The existing life of storage battery is relevant with the number of times of charge and discharge cycles, under normal voltage and normalized current
Charge, cycle-index is generally between 600-1000 time, i.e. 2-3.The battery that must more renew after 2-3 in theory, this
It is inconvenient for it must steadily in the long term operate in the online equipment at outdoor high-voltage end.In addition, from the general spy of battery
Property considering, the capacity of battery is reduced with the reduction of temperature, and lead-acid battery is particularly significant, the most senior engineer of ni-mh and nickel iron cell
40 DEG C are must not exceed as temperature, and the price is rather stiff of jumbo lithium battery, limited by cost and capacity, be not suitable for being used as
Large Copacity electric energy storage device.Meanwhile, solar cell for supplying power power directly depends on the area of cell panel and the capacity of battery, work(
Rate requires that more big battery plate bulk is also bigger, and this is unfavorable for installing, and the impact of the easy climate of power supply quality, more cloudy in south
The foggy weather conditions of rain descend output power substantially not enough.
Powered by wind energy system generally comprises small-sized fan, three parts of batteries and charge-discharge control circuit.Blower fan is only
Having could generate electricity when having wind, not preserve the ability of electric energy, so in order to power to load stabilization, it is also desirable to add and store
Battery, introduces PMU.When wind is big, blower fan not only powers to the load, but also charges to battery.In nothing
When wind or too low blower fan power output, battery discharging, to load energy supply.When being powered to equipment using wind energy, blower fan
Output power depends on local weather conditions, and when windy, blower fan can power to load stabilization, when calm season or wind-force compared with
Where few, powered by wind energy less stable, therefore powered by wind energy also has region and season restriction.
Transmission line of electricity takes online energy, and including based on Coulomb electric field principle and based on electromagnetic induction principle energy mode is taken.Before
Person need using high voltage potential transformer directly take from high-voltage conducting wires can, but due to high-voltage mutual inductor device volume it is larger, no
Beneficial to wire insulation against ground, this mode is seldom adopted.Energy mode is taken online based on electromagnetic induction principle, is divided into being based on again and is led
Line and can method based on taking for ground wire.The energy mode that takes online based on wire is using a special current transformer
(current transformer, CT) obtains required energy from hv transmission line.This transformer is different from power train
Common those of system are used to measuring, the CT of measuring instrumentss and relay protection, secondary circuit short-circuit are not required, to progress of disease required precision
It is very low, as long as enough energy can be transmitted.When taking energy by CT from line conductor, high-voltage conducting wires overcoat annular magnetic conductance
Body, by electromagnetic induction energy, convenient for installation and maintenance with small volume, the simple advantage of insulation-encapsulated are obtained.But due to insulation
Reason, it is this to take the supervising device that energy mode is only applicable to be arranged on high-voltage conducting wires.Additionally, this mode is by power network current
Affect larger, exist " taking energy dead angle "；Finally, during transformer insulation damages, buffer action can not be not only played, on the contrary may be right
Secondary side apparatus or system, and personal safety brings fatal harm.Energy method is taken online based on ground wire, is mainly had at present
The method that energy is taken by CT, and obtain faradic method using two aerial earth wires composition closed-loop paths on circuit.The former
The method for being adopted with it is above-mentioned based on wire take can method it is identical, and there is no corresponding shortcoming, be a kind of up-and-coming
Taking online can mode.But ground line current is generally less, CT take can power also very little, unless using very big CT sizes but excessive
Size will necessarily bring other risks.For using the faradic side of two aerial earth wires composition closed-loop path acquisition on circuit
Method, be also it is a kind of it is reasonable takes online can method, and be typically easy to satisfaction take can power requirement, but this taking can design current
The single design and discussion that take and can put is both for, discussion is not analyzed to multiple spot energy obtaining system, and for some rings
Border is severe and needs the line segment of key monitoring, multiple spot to take what is can be commonly necessary；Additionally, current design is typically based on storing
Battery and the design of lithium battery combination, all there is life-span and the not good defect of maintainability, make the usability of energy taking device in the two
Can be greatly affected.
The content of the invention
In view of this, the present invention provides a kind of transmission line of electricity graded insulation aerial earth wire multiple spot based on electromagnetic induction and takes energy
System is solving the above problems.
The transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system based on electromagnetic induction that the present invention is provided, including punching
Hit protection location, process circuit and monitoring unit；
The input of the surge protection unit is connected respectively with steel tower and graded insulation aerial earth wire, the surge protection
The output end of unit is connected with the input of process circuit, and the monitoring unit is connected to according to setting to defeated with process circuit
The scope for going out voltage is adjusted.
Further, the process circuit includes wave filter, single-phase transformer and rectification circuit,
The rectification circuit includes rectifier bridge, transformer o controller and current transformer, and the wave filter includes the first filter
Ripple device and the second wave filter,
The output end of the first wave filter is connected with the input of single-phase transformer, the output end of the single-phase transformer
It is connected with the input of rectifier bridge, the output end of the rectifier bridge is connected with the input of the second wave filter, second filtering
The output end of device is connected to be adjusted the DC voltage of rectifier bridge output with the input of transformer o controller, institute
State the output end of transformer o controller to be connected with the input of current transformer.
Further, also including super capacitor, the monitoring unit is electric capacity monitoring unit,
The super capacitor is connected by switch IV with the output end of current transformer, and the electric capacity monitoring unit connects with switch IV
Connect for the voltage that current transformer is exported is monitored and according to output magnitude of voltage controlling switch IV break-make.
Further, the single-phase transformer is the single-phase transformer for having multiple tap outputs, the single-phase transformer it is each
Output end is connected respectively by transformer output dip switch with rectifier bridge, and the transformer output dip switch is defeated with transformer
Go out controller connection, for measuring to the rectifier bridge output voltage through the second wave filter.
Further, the transformer output dip switch includes switch I, switch II and switch III, when rectifier bridge output electricity
When being pressed in default normal range (NR), controlling switch II is connected, while controlling switch I and switch III disconnect, when rectifier bridge output
When voltage is higher than default higher limit, controlling switch III is connected, while controlling switch I and switch II disconnect, when rectifier bridge output
When voltage is less than default lower limit, controlling switch switch I is connected, while controlling switch II and switch III disconnect.
Further, the wire short circuit of the ground insulator between the ground wire and steel tower.
Further, it is provided with Zener diode between the single-phase transformer and rectifier bridge.
Further, the switch is solid-state relay.
Further, the surge protection unit includes arrester and surgesuppressor, the arrester and surgesuppressor
Between be serially connected with inductance.
Beneficial effects of the present invention：The present invention directly takes energy from the aerial earth wire of ground connection, not only can solve Insulation Problems,
And suitable for the monitoring device positioned at ground potential, with good engineering application value, can large-scale promotion.For thunder and lightning and
The protector of operation wave impact, wave filter, single-phase transformer, and ensure that DC-DC current transformers are input in the reasonable scope
Transformer o controller, while having good voltage stabilizing function, is conducive to limiting ground wire voltage or current fluctuation is supplied to load
The adverse effect for answering voltage band, while ensureing using safety.Using super capacitor to load supplying, you can to ensure during power-off
To load enough output power and power-on time, while also having non-maintaining, operating temperature range width, long service life etc. excellent
Point.Rectifier bridge voltage output control unit ensures the input of DC-DC current transformers in the reasonable scope, it is ensured that Primary Component DC-DC
Current transformer reliably working；Additionally, electric capacity module monitoring unit imposes on the voltage of super capacitor module and super capacitor temperature to DC-DC
Degree is monitored, once more than the requirement of super capacitor, then exit super capacitor module and by current transformer to loading direct power supply,
Ensure super capacitor reliably working.
Description of the drawings
With reference to the accompanying drawings and examples the invention will be further described：
Fig. 1 is the principle schematic of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the invention will be further described：Fig. 1 is the principle schematic of the present invention.
As shown in figure 1, the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system based on electromagnetic induction of the present invention,
Including surge protection unit, process circuit and monitoring unit；The input of the surge protection unit respectively with steel tower and segmentation
Insulated static wire connects, and the output end of surge protection unit is connected with the input of process circuit, the monitoring unit
It is connected to be adjusted the scope of output voltage according to setting with process circuit.
In the present embodiment, be connected with surge protection unit on input terminal 1 and input terminal 2, for lightning impulse and
The protection of switching impulse ripple.First wave filter is connected with the output port of surge protection unit, and its basic function is logical power frequency, is hindered
High frequency.In view of the distortion of ground wire induced-current than more serious, wave filter adopts bipolar filter.First wave filter simultaneously connects one
Single-phase transformer GB, the single-phase transformer GB are the single-phase transformer for having multiple tap outputs, each output of single-phase transformer
End is connected respectively by transformer output dip switch with rectifier bridge, and the transformer output dip switch is controlled with transformer output
Device connection processed, for measuring to the rectifier bridge output voltage through the second wave filter.Can also realize subsequent conditioning circuit and
The electrical isolation of line monitoring device, ensures equipment and personal safety.Afterwards and meet a Zener diode D, further suppress high
Frequency is disturbed, then and connect a rectifier bridge, it is preferred that the second wave filter is connect again after rectified bridge rectification, by filtered alternating current
Pressure is converted to DC voltage.The amplitude of the DC voltage is closely related with Line Flow etc., in order to ensure the magnitude of voltage follow-up
Current transformer input range within, a control unit, i.e. transformer o controller are set after rectifier bridge, for rectifier bridge
Measure and monitor after output voltage partial pressure.Rectifier bridge output voltage is set to meet the input requirements of current transformer, in the present embodiment
Middle current transformer adopts DC-DC current transformers, and the DC voltage conversion that can be inputted end is conventional DC voltage level.
In the present embodiment, the output end of DC-DC current transformers is connected to lead-out terminal 3,4, and current transformer is also by switching S1
Connection super capacitor C0, switch S1Break-make control is determined by CMU (super capacitor monitoring unit), CMU using CE8808 chips prison
Control DC-DC output voltages.CMU mainly includes voltage comparator, and output driving element, S1 adopts opening with load-bearing capacity
Close, solid-state relay is adopted in the present embodiment.DC-DC current transformer voltages are monitored by voltage comparator, work as current transformer
Output voltage is higher than super capacitor C0Rated value when, CMU control S1 disconnect, make current transformer directly power, otherwise, then closure open
S1 is closed, electric capacity and current transformer is combined to load supplying.
In the present embodiment, single-phase transformer is the single-phase transformer of multiple tap outputs, and each output end is respectively by becoming
Depressor output dip switch K1～K3 is connected to rectifier bridge.The control of switch K1～K3 is entered by TOC (transformer o controller)
Row control.TOC in the present embodiment mainly includes three divider, voltage comparator, output driving element and solid-state relays,
Three solid-state relays correspond to respectively K1, K2 and K3, as shown in Figure 1.TOC is to the rectifier bridge output voltage through the second wave filter
Measure, realize measurement by three voltage comparators (CP1, CP2 and CP3) respectively.When rectifier bridge output voltage is set
When in fixed normal range (NR), one of comparator (CP2) controlling switch K2 is connected, now another two comparator control K1 and
K3 disconnects；When rectifier bridge output voltage is higher than set higher limit, one of comparator (CP3) controlling switch K3 connects
Logical, now another two comparator control K1 and K2 disconnects；It is therein when rectifier bridge output voltage is less than set lower limit
One comparator (CP1) controlling switch K1 is connected, and now another two comparator control K3 and K2 disconnects.The purpose of control be make it is whole
Stream output voltage is all the time in the nominal input range of DC/DC current transformers.Voltage comparator in figure is by super capacitor by dividing
Transformer power-supply.
In the present embodiment, the difference connection segment insulated static wire of terminal 1 and 2 and steel tower, between ground wire and steel tower
Ground insulator then uses wire short circuit, in case other adjacent energy loops that take produce reverse induction electric current on energy taking device, offsets
Taking can power.
In the present embodiment, surge protection unit includes arrester and surgesuppressor, and the arrester and surge suppress
Inductance is serially connected between device, surge protection unit is constituted by 2 grades, the first order be near aerial earth wire side be arrester, mainly
For most of energy of lightning surge of releasing；The second level is SPD (surgesuppressor), is coordinated with arrester, for releasing
Remaining impact energy.For switching impulse surge protection, replaced with the SPD for lightning impulse protection.But its nominal current
More than the switching impulse current value of equal peak value, preferably more than 3 times of nominal current.Additionally, between the first order and the second level also
Inductance is in series with, for limiting lightning current stream to second level protection device, strengthens protected effect.SPD is using with short-circuit protection
The low voltage single-pole product of function, for the surge under protecting lightning impulse and switching overvoltage, its nominal current is rushed according to thunder and lightning
Hit and selected with switching impulse current peak value.
Finally illustrate, above example is only unrestricted to illustrate technical scheme, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, it all should cover at this
In the middle of the right of invention.
Claims (8)
1. a kind of transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system based on electromagnetic induction, it is characterised in that：Including
Surge protection unit, process circuit and monitoring unit；
The input of the surge protection unit is connected respectively with steel tower and graded insulation aerial earth wire, the surge protection unit
Output end be connected with the input of process circuit, the monitoring unit and process circuit are connected to according to setting to output electricity
The scope of pressure is adjusted；
The process circuit includes wave filter, single-phase transformer and rectification circuit；
The rectification circuit includes rectifier bridge, transformer o controller and current transformer, and the wave filter includes the first wave filter
With the second wave filter；
The output end of the first wave filter is connected with the input of single-phase transformer, the output end of the single-phase transformer with it is whole
The input connection of stream bridge, the output end of the rectifier bridge is connected with the input of the second wave filter, second wave filter
Output end is connected to be adjusted the DC voltage of rectifier bridge output with the input of transformer o controller, the change
The output end of depressor o controller is connected with the input of current transformer.
2. the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system of electromagnetic induction is based on according to claim 1, its
It is characterised by：Also include super capacitor, the monitoring unit is electric capacity monitoring unit,
The super capacitor is connected by switch IV with the output end of current transformer, and the electric capacity monitoring unit is connected use with switch IV
In the voltage that current transformer is exported is monitored and according to output magnitude of voltage controlling switch IV break-make.
3. the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system of electromagnetic induction is based on according to claim 1, its
It is characterised by：The single-phase transformer is the single-phase transformer for having multiple tap outputs, each output end of the single-phase transformer
It is connected with rectifier bridge by transformer output dip switch respectively, the transformer output dip switch and transformer output control
Device connects, for measuring to the rectifier bridge output voltage through the second wave filter.
4. the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system of electromagnetic induction is based on according to claim 3, its
It is characterised by：The transformer output dip switch includes switch I, switch II and switch III, when rectifier bridge output voltage is pre-
If normal range (NR) in when, controlling switch II is connected, while controlling switch I and switch III disconnect, when rectifier bridge output voltage it is high
When default higher limit, controlling switch III is connected, at the same controlling switch I and switch II disconnect, when rectifier bridge output voltage it is low
When default lower limit, controlling switch switch I is connected, while controlling switch II and switch III disconnect.
5. the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system of electromagnetic induction is based on according to claim 1, its
It is characterised by：Ground insulator between the ground wire and steel tower wire short circuit.
6. the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system of electromagnetic induction is based on according to claim 3, its
It is characterised by：Zener diode is provided between the single-phase transformer and rectifier bridge.
7. the transmission line of electricity graded insulation aerial earth wire multiple spot energy obtaining system of electromagnetic induction is based on according to claim 4, its
It is characterised by：The switch is solid-state relay.
8. the transmission line of electricity graded insulation aerial earth wire based on electromagnetic induction according to claim 1-7 any claim
Multiple spot energy obtaining system, it is characterised in that：The surge protection unit includes arrester and surgesuppressor, the arrester and electricity
Gush and be serially connected between suppressor inductance.
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| CN201510405495.0A CN104979853B (en) | 2015-07-10 | 2015-07-10 | Power transmission line sectioned insulating overhead ground wire multi-point power accessing system based on electromagnetic induction |
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| CN201510405495.0A CN104979853B (en) | 2015-07-10 | 2015-07-10 | Power transmission line sectioned insulating overhead ground wire multi-point power accessing system based on electromagnetic induction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066825A (en) * | 2018-09-21 | 2018-12-21 | 福州大学 | 220kV transmission line insulator lightning conducter based on Switching Power Supply takes can method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067006A (en) * | 2018-07-11 | 2018-12-21 | 国网河北省电力有限公司 | Transmission line of electricity power extraction system based on impulse modulation inversion |
| CN111697824B (en) * | 2020-05-18 | 2021-11-19 | 西安交通大学 | Electric field induction energy-taking power supply circuit with cascaded trapezoidal topological structure |
| CN112165178A (en) * | 2020-09-23 | 2021-01-01 | 许继集团有限公司 | Ground wire induction electricity taking device based on single-phase isolation suppressor |
| CN113224802A (en) * | 2021-05-20 | 2021-08-06 | 贵州电网有限责任公司 | Ground wire energy taking and storing device and method based on electromagnetic induction |
| CN116914867B (en) * | 2023-09-14 | 2023-12-05 | 国网江苏省电力有限公司常州供电分公司 | Energy and power supply device and method for secondary fusion on-pole circuit breaker |
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| CN103474987B (en) * | 2013-09-06 | 2015-04-15 | 国家电网公司 | Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction |
| CN204068435U (en) * | 2013-11-20 | 2014-12-31 | 国网河南省电力公司驻马店供电公司 | The direct electricity getting device of a kind of transmission line |
| CN104124783B (en) * | 2014-07-24 | 2016-08-24 | 成都厚明科技有限公司 | A kind of electricity getting device making somebody a mere figurehead lightning protection ground wire based on transmission line of electricity |
| CN104377739A (en) * | 2014-11-28 | 2015-02-25 | 国网河南省电力公司漯河供电公司 | Monitoring equipment power supply system for high voltage capacitor step-down electricity taking of tower pole line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109066825A (en) * | 2018-09-21 | 2018-12-21 | 福州大学 | 220kV transmission line insulator lightning conducter based on Switching Power Supply takes can method |
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