CN106410869A - Induction power supply, with lightning-protection ground wires, of high tension transmission line - Google Patents
Induction power supply, with lightning-protection ground wires, of high tension transmission line Download PDFInfo
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- CN106410869A CN106410869A CN201611037734.2A CN201611037734A CN106410869A CN 106410869 A CN106410869 A CN 106410869A CN 201611037734 A CN201611037734 A CN 201611037734A CN 106410869 A CN106410869 A CN 106410869A
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Abstract
The invention discloses an induction power supply, with lightning-protection ground wires, of a high tension transmission line. The induction power supply obtains electric energy from a power transmission lead via an overhead ground wire network, and the electric energy is provided for power transmission line monitoring equipment continuously and stably after power transformation. The induction power supply is characterized in that a primary end of an energy-taking transformer is connected to the overhead ground wire network in series, and induction loop current formed by a spatially closed plane which is composed of the two lightning-protection ground wires and iron towers is used to take energy, and a decoupling coil is mounted between the power supply and the ground wires, so that the induction power supply does not influence lightning-protection and zero-sequence protection performances of the line. Thus, a power system relies on energy storage equipment less, and the maintenance period and reliable work time of the power supply system are prolonged.
Description
Technical field
The present invention relates to induction power supply field, particularly a kind of ultra-high-tension power transmission line lightning protection ground wire induction power supply.
Background technology
Proposition intelligent grid construction and Diagnostic Examination And Repair of Electric Power Facilities being required with country, transmission line of electricity on-line monitoring skill
Art achieves larger development in recent years.After national large area ice damage occurs within particularly 2008, regulatory authorities are even more
Increase the dynamics to power transmission state monitoring intellectualized reconstruction.
By the end of the year 2014, domestic on-line monitoring device for transmission line has installed 100,000 sets about.These devices are for defeated
While the equipment state overhauling work of electric line provides effective technical support, also expose a lot of problems.According to China
The statistics of DianKeYuan, only 20% can normally run in the on-line monitoring device for transmission line installed in the range of current state net.
In faulty equipment, mostly due to caused by power failure.Current power transmission circuit on-Line Monitor Device
The powering mode being adopted is " photovoltaic panel+accumulator ".The acquisition of luminous energy is protected from environmental very big, in sleet, dense fog etc.
Under the not enough weather of illumination, the electric energy that photovoltaic panel produces can not meet equipment normal work needs, even in fine day, photovoltaic panel
The time of output electric energy is also less than 5 hours at full capacity.Therefore it has to adopt jumbo accumulator, with ensure sleet,
Under the not enough weather of the illumination such as dense fog, provide work energy by accumulator for monitoring device.Set from transmission line of electricity on-line monitoring
From the point of view of the lead-acid accumulator commonly using in standby and cadmium-nickel accumulator, the average life that accumulator uses was less than 1 year.Its reason
Mainly there is the following aspects：
1st, photovoltaic panel large current charge shortens the life of storage battery:Belong to intermittent power supply due to solar powered, therefore in order to protect
Card monitoring device in the case of long-time luminous energy deficiency can meet the job requirement of 7 × 24 hours, and the accumulator being adopted is held
Amount is all very big（100～200AH）, typically all can adopt large current charge at short notice battery is full of, and regular
Large current charge can cause the decline of the life of storage battery.
2nd, long-time rainy weather may lead to charge controller cannot start：At present all of charge controller be all by
Storage battery power supply, when battery tension is less than 7V, charge controller will quit work, in autumn and winter season cloudy day and light for a long time
In the case of the illumination deficiency such as volt plate icing, snowberg, battery electric energy will exhaust, even if the abundance charge controller of illumination later
Cannot charge for accumulator.
3rd, cover dirt and reduce photovoltaic panel power taking efficiency：Photovoltaic panel is chronically exposed to field, and it is more long-pending thicker that dirt is covered on surface, will lead
Causing photovoltaic panel power taking efficiency to gradually reduce, cause the long-term charge less of accumulator, once running into cloudy day or snow icing for a long time, being more easy to out
Problem described in existing 2nd point.
Based on above three aspect reasons, only it is difficult to ensure that working reliably and with long-term of monitoring device by photovoltaic panel.
Content of the invention
Present invention solves the technical problem that being to provide a kind of ground wire induction power supply, by aerial earth wire network from transmission pressure
Upper extraction electric energy.As long as having appropriate electric current to flow through on transmission line of electricity it is possible to energy is obtained from aerial earth wire.
The technical scheme is that：
There is provided a kind of ultra-high-tension power transmission line lightning protection ground wire induction power supply, described induction power supply is led from transmission of electricity by aerial earth wire network
Extract electric energy on line, and after power conversion, provide continual and steady energy resource supply, its feature for transmission line of electricity monitoring device
It is, the primary side of power taking transformator is concatenated in aerial earth wire network, using the sky of two lightning protection ground wires and steel tower composition
Between closure plane formed inductance loop stream carry out power taking.
Using the ground wire clearance for insulation of segmented ground aerial earth wire network, ground wire induction power supply is connected across ground wire and steel tower
Between so that between tension force tower, ground wire, tangent tower formed closed path path.
Power supply one decoupling coil can be installed between ground wire so that described induction power supply do not affect line thunder protection performance and
Zero-sequenceprotection performance.
Described induction power supply input and outfan all carry over-voltage over-current protection circuit.
Described induction power supply includes power taking transformator, Anti-surging current circuit, protection circuit against input over-voltage, and rectifying and wave-filtering is steady
Volt circuit, supervisory circuit and standby lithium pond circuit.
Described Anti-surging current circuit includes TVS pipe, and protection circuit against input over-voltage to be completed using bidirectional thyristor.
Described protection circuit against input over-voltage includes varistor R20, RC buffer circuit, bilateral diode D0, two-way crystalline substance lock
Pipe Q1, the two ends of described varistor R20, the two ends of RC buffer circuit, the negative electrode of IGCT Q1 and anode two ends are all attempted by
The outfan of power taking transformator, described RC buffer circuit is constituted by after resistance R0 and C0 series connection, and one end of bilateral diode D0 is even
Meet R0 and C0 is connected in series a little, and the other end connects the control end of bidirectional thyristor Q1.
Described rectification filtering voltage stabilizing circuit passes through full-bridge rectification, and the alternating current taking off on high voltage transmission line is converted into directly
Stream output, after capacitor filtering, using the different DC voltage of linear voltage regulator output.
The invention has the beneficial effects as follows：The present invention for those have throughout the year certain load circuit we can continue
Obtain energy from circuit, this just substantially reduces our demands to middle energy storage component.The present invention can from the life-span longer,
Using the more convenient but low energy storage component of Capacity Ratio accumulator（As super capacitor）As energy snubber pond.Its status is just from master
Energy supply part is wanted to be changed into power adjusting section, its effect is also adjusted for instantaneous power from needing continuous discharge to become, thus significantly
Reduce power-supply system to the dependence of energy storage device so that the maintenance period of power-supply system extended to 3 from present 6～12 months
More than year, the power supply reliably working time is greatly improved.Further, since the power supply persistence of ground wire induction power supply, it supplies external
Less output current can be adopted when electric, in this case, even if rear end still adopts accumulator as energy snubber pond,
Due to being that small current persistently charges, the life-span of accumulator can greatly increase.
Brief description
Fig. 1 ground wire faradic current schematic diagram；
Fig. 2 power taking principle schematic；
Fig. 3 power-supply system accesses earth cord network schematic diagram；
Fig. 4 device context scheme of installation；
Fig. 5 thyristor application circuit diagram；
Fig. 6 rectification filtering voltage stabilizing circuit.
Specific embodiment
As shown in figure 1, according to Maxwell's principle, wire flowing through and can produce alternating magnetic field in space during alternating current,
And the cutting of this alternating magnetic field can produce sense when closing plane by the space that two lightning protection ground wires and steel tower form on this plane
Answer electromotive force, once the electric conductor of this plane forms loop, sensing circulation can be formed on this is to a plane.
According to《Power engineering high voltage circuit design manual（The second edition）》On example calculation, for 220kV circuit
376 watts of power loss, when current in wire is for 436A, can be produced on 1 kilometer of ground line loop.Therefore, ground wire for a long time
On faradism be treated as the negative effect of transmission line of electricity always and treat.
Loss on earth cord network is converted to available electric energy by ground wire induction power supply series of products, can be transmission line of electricity
Monitoring device provides continual and steady energy resource supply.
Fig. 2 adopts the operation principle of constant pressure source for induction power supply, and the primary side of power taking transformator is concatenated into aerial earth wire
In network, because main primary end has larger impedance, produce voltage U, therefore root in power input port when the current flows
According to Ohm's law：
P=U×I U：Power port voltage I：Flow through the electric current of main primary
Just power can be obtained.In actual applications, using the ground wire clearance for insulation of segmented ground aerial earth wire network, by ground wire
Induction power supply is connected across between ground wire and steel tower.
Accompanying drawing 3 accesses earth cord network schematic diagram for power-supply system, as shown in figure 3, ground wire induction power supply is arranged on " tangent tower
2 " on.In this segmented ground section, the earth point of ground wire, on " tension force tower 1 ", other towers is logical between aerial earth wire and steel tower
Cross what the insulator chain in belt discharge gap was attached, therefore we can be connected on " ground wire input one end of power-supply system
1 " on, another terminate on " tangent tower 2 ", the other end of " tangent tower 2 " is passed through shorting stub and " ground wire 2 " short circuit simultaneously, in
It is that a close access is constituted by " ground wire 1 ", " tangent tower 2 ", " ground wire 2 " and " tension force tower 1 ", faradic current is logical in this closure
Road flow, the principle according to Fig. 2 we just can under conditions of not changing original ground wire power series in earth cord network.
Accompanying drawing 4 is main mounting means on transmission line of electricity for the ground wire induction power supply, in the aerial earth wire of power supply installation place
The insulator in one belt discharge gap is installed and between steel tower it can be seen that a decoupling coil can be provided between ground wire in power supply.
After thunder and lightning hits on aerial earth wire, because decoupling coil is the equal of an inductance for the frequency of lightning wave, inductance
Moment choked flow effect can make the discharging gap on ground wire discharge first.The access of therefore ground wire power supply will not be original to aerial earth wire
Lightning protection flash-over characteristic produce impact.
Meanwhile, circuit zero-sequenceprotection refers to, when wire short circuit, to produce because three-phase power transmission is uneven on ground wire
Raw high current, when this high current is detected, the corresponding protection of transformer station can protection act.The same with thunder and lightning startup situation, wink
Between zero-sequence current change can make decoupling coil between power supply for the ground wire that one inverse electromotive force occurs, stop electric current from flowing through power supply
Equipment, so that protection act still presses circuit design requirement action.
On the other hand, power-supply system front end carried to press through and stayed protection, and was isolated using transformator, therefore in itself
There is very strong capacity of resisting disturbance.The outfan of this external power supply also devises output over-voltage protection and output overcurrent short circuit is protected
Protection unit, these measures be enough to ensure the stable operation of rear end monitoring device.
Different allocation plans can be adopted according to different field requirement in actual use：
1）Ground wire induction power supply+super capacitor（Suggested design）
Under this allocation plan, the power supply of monitoring system casts aside photovoltaic+battery system completely, complete
Entirely power using by HM5002 ground wire induction power supply, its concrete configuration is ground wire induction power supply+super capacitor.Its applicable bar
Part is as follows：
Power line load is heavier, generally higher than 200～300 amperes；
Power load is less it is not necessary to continuous heating（Average power consumption throughout the year<10W）;
Program advantage is that power supply is lightweight, long service life, not need to change accumulator, maintenance cost low；Deficiency is online
The intermittent work pattern of " recharge-discharge " can only be adopted, power supply itself energy storage capacity is not high during the underload of road.
2）Ground wire induction power supply+accumulator
Under this allocation plan, the power supply of monitoring system does not use photovoltaic panel but adopts battery management
System, by HM5002 ground wire induction power supply power and batteries to store energy mode.The program is applied to major applications field
Scape.Its advantage is that batteries to store energy ability is strong, and when circuit is underload, accumulator can provide longer continued power ability,
And larger power can be provided it in a long time for the equipment with heating requirements.The program for existing
Line monitoring device power supply when being replaced very convenient it is only necessary to remove photovoltaic panel then access ground wire power taking power supply.?
Because ground wire induction power supply is a kind of power supply of sustainable power supply in this scheme, the capacity of required accumulator can significantly subtract
Little, generally can be reduced to 20～30AH from existing 100～200AH, and the life-span of accumulator can be far longer than
It is used alone the situation of photovoltaic panel.Its applicable elements is as follows：
Power line load is heavier, generally higher than 200～300 amperes；
Power load is less it is not necessary to continuous heating（Average power consumption throughout the year<10W）
3）Ground wire induction power supply+photovoltaic panel+accumulator
Under this allocation plan, the power supply of monitoring system adopts photovoltaic panel and ground wire induction power supply simultaneously, and both complement one another, energy
Meet the application of most of scene
When instantaneous short-circuit on power transmission line, high short circuit current can be produced, this short circuit current is coupled by current transformer
Irreversible damage can be caused to the components and parts in circuit in power-supply circuit.This circuit design employs TVS pipe to stop
The impact of surge current.
TVS pipe is Transient Voltage Suppressor, and its feature is：Response speed is especially fast（For ns level）；Peak value of pulse electricity
Stream is from 0.52A～544A；Breakdown voltage uses from the series of values of 6.8V～550V, the circuit being easy to various difference voltages；Have
The differentiation of two-way TVS and unidirectional TVS, adopts two-way TVS pipe in AC power line.
Even if there is not the phenomenon of instantaneous short-circuit it is also possible to work long hours in the feelings of larger current in high voltage transmission line
Under condition, the voltage therefore inducing from current transformer is possible to exceed the highest permission input voltage of mu balanced circuit, because
Primarily to protecting follow-up voltage stabilizing chip, the present invention mainly to be completed this overvoltage crowbar using bidirectional thyristor.
Bidirectional thyristor develops on the basis of triode thyristor and forms, and she can not only replace two reversed polarity parallel connections
IGCT and also only need a triggers circuit, be alternating-current switch device more satisfactory at present.Three terminal bidirectional IGCT can lead to
Cross and apply positive or negative signal and open.Three terminal bidirectional thyristor switch all can pass through when applying voltage forward or backwards
Signal is opened.In order to prevent spurious pulse triggering bidirectional thyristor, cause conducting out of control, cause motor operation unstable, make an uproar
Sound increases, and always includes additional protection element in the circuit of 4Q bidirectional thyristor, and in typical circuit, RC buffer circuit is in parallel
Between the main terminal of bidirectional thyristor, for limiting the rate of change of voltage, also need to jumbo inductance in some cases, with
Limit current changing rate during switching.The selection of buffer circuit element is to limit dVCOM/dt under certain level, really
Protect and do not trigger bidirectional thyristor.Under these conditions, select maximum R value and minimum C value, electric capacity electric discharge can be buffered
When lead to destroy probability be preferably minimized.As shown in Fig. 5, in figure D0 is bilateral diode to concrete application circuit, when defeated
When on electric wire, electric current is excessive, by RC charging circuit, C point voltage improves constantly, when reaching bilateral diode breakdown voltage
（It is about 37v）When, IGCT is triggered conducting, protects follow-up voltage stabilizing chip so that the input voltage of voltage stabilizing chip exists
Below 377v.
The alternating current taking off on high voltage transmission line is mainly converted into direct current output by rectification circuit, and the present invention is using often
Bridge rectifier method, to reach the purpose that exchange turns direct current, as shown in Figure 6.Electric current due to flowing through bridge rectifier can
Can be very big, the direction voltage that it bears simultaneously may also can be higher.Therefore selecting rectifier bridge model it is noted that three are joined
Number：One is maximum forward conducting electric current；Two is breakdown reverse voltage；Three is maximum diffipation power.
The method that filter circuit mainly adopts the filtering of electric capacity, in rectification circuit output end parallel connection one bulky capacitor and
Small capacitances, bulky capacitor is used for the filtering to low frequency, and small capacitances are used for the filtering to high frequency.
Mu balanced circuit mainly includes the two poles of the earth voltage stabilizing：One is Head switches power supply stabilization circuit because the power supply that opens the light have defeated
Enter voltage range big, the feature of efficiency high, therefore it is placed on first order voltage stabilizing；Two is linear voltage stabilization, and the feature of linear voltage stabilization is stricture of vagina
Ripple is little, output voltage stabilization.That switching power source chip is selected is LM2576, and this serial manostat is monolithic integrated optical circuit, energy
The various functions of step-down switching regulator are provided, the load of 3A can be driven.Linear switch power supply chip select be
LM1086, LM1086 are a typical low pressure difference linearity integrated regulators, input and output voltage difference as little as 1.5V, output
Up to 1.5A, LM1086 can provide fixing output 1.8V, 2.5V, 2.85V, 3.3V, 3.45V, 5V to electric current, with
When also provide for export adjustable voltage stabilizer LM1076-adj.
Above-mentioned specific embodiment simply to illustrate that the technology design of the present invention and application characteristic, its object is to allow familiar
The project planner in this field will appreciate that the Essence of the present invention and is applied, but therefore can not limit this
Bright protection domain.Therefore practical application when any physical location all within the protection domain of this patent.No matter above
In arise how detailed description it is also possible to many modes implement the present invention.The details of above-mentioned control mode executes at it
Considerable change can be carried out in details, but it is still contained in the present invention disclosed herein.All according to the present invention
Equivalent transformation or modification that spirit is done, all should be included within the scope of the present invention.
Claims (8)
1. a kind of ultra-high-tension power transmission line lightning protection ground wire induction power supply, described induction power supply passes through aerial earth wire network from transmission pressure
Upper extraction electric energy, and after power conversion, provide continual and steady energy resource supply for transmission line of electricity monitoring device, its feature exists
In the primary side of power taking transformator is concatenated in aerial earth wire network, using the space of two lightning protection ground wires and steel tower composition
The inductance loop stream that closure plane is formed carries out power taking.
2. ultra-high-tension power transmission line lightning protection ground wire induction power supply according to claim 1 is it is characterised in that utilize segmented ground
The ground wire clearance for insulation of aerial earth wire network, described ground wire induction power supply is connected across between ground wire and steel tower so that tension force tower,
Form closed path path between ground wire, tangent tower.
3. ultra-high-tension power transmission line lightning protection ground wire induction power supply according to claim 2 is it is characterised in that can ground wire in power supply
Between a decoupling coil is installed so that described induction power supply does not affect line thunder protection performance and zero-sequenceprotection performance.
4. the ultra-high-tension power transmission line lightning protection ground wire induction power supply according to Claims 2 or 3 is it is characterised in that described sensing
Power input and outfan all carry over-voltage over-current protection circuit.
5. the ultra-high-tension power transmission line lightning protection ground wire induction power supply according to Claims 2 or 3 is it is characterised in that described sensing
Power supply includes power taking transformator, Anti-surging current circuit, protection circuit against input over-voltage, rectification filtering voltage stabilizing circuit, supervisory circuit
And standby lithium pond circuit.
6. ultra-high-tension power transmission line lightning protection ground wire induction power supply according to claim 5 is it is characterised in that described Anti-surging is electric
Current circuit includes TVS pipe, and protection circuit against input over-voltage to be completed using bidirectional thyristor.
7. ultra-high-tension power transmission line lightning protection ground wire induction power supply according to claim 6 is it is characterised in that described input is over-pressed
Protection circuit includes varistor R20, RC buffer circuit, bilateral diode D0, bidirectional thyristor Q1, described varistor R20
Two ends, the two ends of RC buffer circuit, the negative electrode of IGCT Q1 and anode two ends be all attempted by the outfan of power taking transformator, institute
State RC buffer circuit to be constituted by after resistance R0 and C0 series connection, one end connection R0 and C0 of bilateral diode D0 is connected in series a little,
The other end connects the control end of bidirectional thyristor Q1.
8. ultra-high-tension power transmission line lightning protection ground wire induction power supply according to claim 5 is it is characterised in that described rectifying and wave-filtering
Mu balanced circuit passes through full-bridge rectification, the alternating current taking off is converted into direct current output, through capacitor filtering on high voltage transmission line
Afterwards, using the DC voltage that linear voltage regulator output is different.
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| CN201611037734.2A CN106410869A (en) | 2016-11-23 | 2016-11-23 | Induction power supply, with lightning-protection ground wires, of high tension transmission line |
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| CN201611037734.2A CN106410869A (en) | 2016-11-23 | 2016-11-23 | Induction power supply, with lightning-protection ground wires, of high tension transmission line |
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| CN107086610A (en) * | 2017-04-28 | 2017-08-22 | 国网浙江桐庐县供电公司 | Online energy taking device for transmission line of electricity |
| CN107508385A (en) * | 2017-08-18 | 2017-12-22 | 武汉泰可电气股份有限公司 | One kind utilizes the faradic electricity getting system of overhead ground wire and method |
| CN111509757A (en) * | 2020-04-03 | 2020-08-07 | 清华大学 | Isolated energy supply device and method for fully-controlled switch device |
| CN112600307A (en) * | 2020-12-31 | 2021-04-02 | 广西电网有限责任公司百色供电局 | Power transmission line multi-energy complementary power supply system and power supply method thereof |
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| CN111509757A (en) * | 2020-04-03 | 2020-08-07 | 清华大学 | Isolated energy supply device and method for fully-controlled switch device |
| CN112600307A (en) * | 2020-12-31 | 2021-04-02 | 广西电网有限责任公司百色供电局 | Power transmission line multi-energy complementary power supply system and power supply method thereof |
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