CN103474987B - Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction - Google Patents

Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction Download PDF

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Publication number
CN103474987B
CN103474987B CN201310401969.5A CN201310401969A CN103474987B CN 103474987 B CN103474987 B CN 103474987B CN 201310401969 A CN201310401969 A CN 201310401969A CN 103474987 B CN103474987 B CN 103474987B
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ground wire
line
rectification unit
monitoring
energy
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CN103474987A (en
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曹永兴
范松海
丁登伟
刘凡
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Abstract

The invention discloses an electric transmission line on-line monitoring device energy obtaining system based on ground wire induction. The electric transmission line on-line monitoring device energy obtaining system comprises a voltage stabilizer, a rectifying unit, a charging battery, an on-line monitoring device and an overhead ground wire, wherein the rectifying unit is provided with two input ends and two output ends, one of the input ends of the rectifying unit is connected with the voltage stabilizer, the other input end of the rectifying unit is connected with the ground, the voltage stabilizer is connected onto the overhead ground wire, the anode of the charging battery and the cathode of the charging battery are connected with the two output ends of the rectifying unit respectively, charging management units are arranged at the portions, between the anode of the charging battery and the output ends of the rectifying unit, of a line, the two ends of the on-line monitoring device are connected to the two output ends of the rectifying unit respectively, and power supply management units are arranged at the portions, between the input end of the on-line monitoring device and the output ends of the rectifying unit, of the line. Electric energy is supplied for the on-line monitoring device through the induction voltage of the ground wire and the induction current of the ground wire, and the energy is not directly obtained from the high voltage end of a bus, the insulating performance is good, and the electric transmission line on-line monitoring device energy obtaining system has good stability and good continuity, is low in cost and can be popularized and applied on a large scale.

Description

On-line monitoring device for transmission line based on ground wire induction is got can system
Technical field
The present invention relates to transmission line on-line monitoring field, the on-line monitoring device for transmission line specifically based on ground wire induction gets energy system.
Background technology
On-line monitoring technique has the advantages such as automatic screening apparatus state, monitor signal be continuous, is applied to transmission line more and more widely in recent years.According to the preliminary statistics, the on-Line Monitor Device type being applied to transmission line at present reaches more than 20 and plants.On-line monitoring device for transmission line is arranged on field, and it is got can technology be a technical barrier always.According to a statistics of Sichuan province, the transmission line on-line monitoring fault caused because of electricity shortage accounts for more than 40% of total failare.Energy supply problem has become the Main Bottleneck that restriction transmission line on-line monitoring technique further develops.
Current power transmission circuit on-Line Monitor Device get can mode have: solar energy+storage battery, wind energy+storage battery, by voltage transformer or current transformer get on transmission line can etc.Wherein, solar electric power supply system generally comprises silicon solar cell, batteries and charge-discharge control circuit three parts.Silicon solar cell only could generate electricity when illumination, do not possess the ability of preserving electric energy, exporting to obtain stable power supply, guaranteeing to power to the load incessantly, need storage battery and silicon solar cell is connected in parallel (silicon solar cell charges to battery).When there being illumination abundance, silicon solar cell one side powers to the load, and one in the face of charge in batteries, to be powered to the load energy by storage battery at cloudy day or night.Storage 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 operating state and corresponding management strategy are realized by SCM Based charge-discharge control circuit.Adopt solar energy to power to equipment, solar cell for supplying power power directly depends on the area of cell panel and the capacity of storage battery.The existing life of storage battery is all relevant with the number of times of charge and discharge cycles, charges under normal voltage and normalized current, and cycle-index is generally between 600-1000 time, i.e. 2-3.The storage battery that must more renew after 2-3 in theory, this concerning must long-term stability operate in outdoor high-voltage end online equipment be inconvenient.In addition, consider from the general characteristic of storage battery, the capacity of battery reduces with the reduction of temperature, lead-acid battery particularly shows, the maximum operating temperature of ni-mh and nickel iron cell must not more than 40 DEG C, and the price is rather stiff of jumbo lithium battery, by cost and appearance quantitative limitation, be not suitable for being used as Large Copacity electric energy storage device.Meanwhile, solar panel is bulky and be unfavorable for installing, and power supply quality is subject to climatic influences, and under the weather conditions that the many wet weather in south are foggy, output power is obviously not enough.
Powered by wind energy system generally comprises small-sized fan, batteries and charge-discharge control circuit three parts.Blower fan only could generate electricity when there being wind, does not preserve the ability of electric energy, so in order to power to load stabilization, also needs to add storage battery, introduces Power Management Unit.When wind is large, blower fan not only powers to the load, but also to charge in batteries.When calm or blower fan power output is too low, battery discharging, to load energy supply.When adopting wind energy to power to equipment, the output power of blower fan depends on local weather conditions, time windy, blower fan can be powered to load stabilization, when in calm season or the less place of wind-force, powered by wind energy less stable, therefore powered by wind energy also has region and restriction in season.
Utilizing the thought of high-voltage capacitance dividing potential drop power taking energy to be similar to electromagnetic induction and get energy, is all the idea of " drawing materials nearby ".There is radially-arranged alternating electric field around high-tension line, rely on distributed capacitance or the direct-to-ground capacitance in ring week space, certain electric field energy can be intercepted and captured, through treatment measures such as rectification, filtering and voltage stabilizings, then give high-pressure side observation circuit energy supply.When practical application, obtain different voltage by the high-voltage capacitance size adjusting dividing potential drop and export, thus reach the power requirement of design.When voltage transformer is powered, because circuit travel line change in voltage is little, export energy relevant with the high-voltage capacitance size of dividing potential drop, more stable voltage can be obtained by capacitance partial pressure, there is circuit simple, lower-cost advantage.The shortcoming that voltage transformer is powered is that fail safe is not high enough, and reliability is lower, there is certain work blind area (primary side instantaneous short circuit may make equipment normally not run), in addition, needs to consider that stand-by power supply too increases the complexity of system.How to ensure the electrical isolation between energy supply circuit and follow-up work circuit, this requires more strict overvoltage protection design; Next is that this method has more source of error, as the many factors such as temperature, stray capacitance and electromagnetic interference all will affect the performance of the method.Finally, adopt the power limited obtained in this way, export although Modulating Power can be carried out by the size changing electric capacity C, selecting of bulky capacitor may produce harmonic wave, causes dividing potential drop unstable, affects subsequent conditioning circuit.
Due to overhead transmission line inherently energy transmission line, the energy of conventional current instrument transformer obtains from electrical network.For this reason, from the angle of practicality, many reports propose a kind of online electrical network energization schemes, namely adopt a special current transformer to obtain required energy from hv transmission line, have structure simple, be easy to realize and low cost and other advantages.Electric power system Current Transformer is a kind of special transformer electrical network high voltage, big current information being delivered to low-voltage, the metering of secondary side of small area analysis, measuring instrument and relaying protection, automatics.When using in electrical network, there is the function of transformer energy transmission, can by the secondary side of electrical network high voltage energy transferring to low electricity, and secondary side equipment and electrical secondary system and primary system high-tension apparatus can be isolated well in electric, ensure the safety of secondary device and the person.Thus, instrument transformer can be utilized to get and can obtain energy from circuit by equipment.When adopting current transformer induction energy fetching from circuit, circuit overcoat annular magnetic conductor, obtains energy by electromagnetic induction, this get can mode to have volume little, get and can stablize, compact conformation, insulation-encapsulated simply, safe advantage.During current transformer power supply, owing to obtaining energy from electrical network, its work is certain to the impact being subject to power network current.Usual line current dynamic range is very large, causes this method to there are technological difficulties, first when primary current lower (being low to moderate number peace), can not obtain enough energy, cause and get and can leave " getting energy dead angle " by equipment; Secondly when primary current increase to thousands of peace above time, getting can the interference that causes each device of secondary of the high-pressure sharp pulse of instrument transformer generation and damage, especially to the interference of power supply and subsequent conditioning circuit.
Summary of the invention
The object of the invention is to solve the problem that the restriction of power transmission line energy supply now transmission line on-line monitoring technique further develops, provide a kind of on-line monitoring device for transmission line based on ground wire induction and get energy system, it utilizes the induced voltage of ground wire and induced current to provide electric energy for on-line monitoring equipment, not direct getting from bus high-pressure side can, there are good insulation property, and can ensure to get can stablize, continue.
Object of the present invention is achieved through the following technical solutions: the on-line monitoring device for transmission line based on ground wire induction gets energy system, comprise pressurizer, rectification unit, rechargeable battery, on-Line Monitor Device and the overhead ground wire be erected on steel tower, described rectification unit is provided with two inputs and two outputs, rectification unit input is connected with pressurizer, its another input end grounding, the other end that pressurizer connects rectification unit end is relatively connected on overhead ground wire, the both positive and negative polarity of described rechargeable battery is connected with two outputs of rectification unit respectively, circuit between rechargeable battery positive pole and rectification unit output is provided with monitoring charged battery voltage, and control the Charge Management unit of circuit on-off between rechargeable battery positive pole and rectification unit output, the two ends of described on-Line Monitor Device are connected on two outputs of rectification unit, and the circuit between described on-Line Monitor Device input and rectification unit output is provided with monitors rectification unit output voltage and the Power Management Unit when rectification unit output voltage departs from set point, on-Line Monitor Device input being switched to rechargeable battery positive pole.When electric power system normally runs, because the locus between the every phase conductor of overhead transmission line and every root ground wire is asymmetric,, there is the conjunction of capacitive lotus root between alternating current circuit and ground wire and close with perceptual lotus root, ground wire produces electrostatic induction voltage and electromagnetic induction voltage in the current imbalance that every phase conductor flows through.Loop is formed by steel tower and earth point, circulation loop between the line forming two ground wires between two ground wires; In addition, every root ground wire is again loop respectively with the earth, forms induced current loop.The electrostatic induction voltage of ground wire is because every root lightning conducter is asymmetric to three-phase conducting wire physical dimension spatially, the voltage to earth that high-voltage conducting wires causes its surrounding space generation high voltage electric field, namely wire and ground wire capacitive coupling and the electrostatic induction voltage produced on ground wire, its value only depends on the size of space potential residing for ground wire.Therefore, the relative position of the electrostatic induction voltage of ground wire and the voltage of power line and wire, ground wire is relevant, and has nothing to do with current in wire, irrelevant with line length (but when two electrostatic induction voltage superposes, the quantity of electric charge does vectorial superposition, because of the quantity of electric charge q= cU, and the direct-to-ground capacitance of lightning conducter cbe directly proportional to line length, therefore relevant with line length when electrostatic induction voltage superposes thus).The electromagnetic induction voltage of ground wire is produced on ground wire by the electromagnetic coupled between wire, lightning conducter by load current on power transmission sequence, and it is directly proportional to the electric current of transmission line, and when electric current is zero, its value is zero; Have nothing to do with bus voltage, and be directly proportional to the length of power line, its value superposes, therefore, also referred to as induced electromotive force along lightning conducter.When insulate lightning conducter one point earth time, do not change the electrical potential difference at its two ends, only above earth potential be distributed with change, thus there is no induced current.Wherein, pressurizer is used for regulation voltage within the specific limits, and simultaneously when voltage exceedes certain value, automatic shutoff circuit, thus the effect playing that protection the present invention gets energy system, rectification unit then becomes the alternating voltage on ground wire into direct voltage.
In order to discharge lightning current, preventing thunderbolt overcurrent from flowing through of the present invention getting can system, described overhead ground wire is connected with surge protection unit.
Further, described surge protection unit is lightning arrester.
Circuit between described pressurizer and overhead ground wire is in series with the first inductance, the circuit between described Charge Management unit and rectification unit output is in series with the second inductance.Wherein, the first inductance is as flow restricter, and it is mainly used in restriction lightning current and flows through, and the second inductance is used for flat ripple reactance, and then reduces voltage fluctuation.
Further, described rectification unit is bridge rectifier.
Further, described Charge Management unit comprises single-pole single-throw switch (SPST) and the whether saturated power supply monitoring module controlling single-pole single-throw switch (SPST) divide-shut brake of monitoring rechargeable battery.Wherein, the single-pole single-throw switch (SPST) normal phase is in "on" position, if when power supply monitoring module monitors is saturated to charged battery voltage, and single-pole single-throw switch (SPST) separating brake.
Described Power Management Unit comprises single-pole double-throw switch (SPDT) and monitoring rectification unit output voltage and the voltage monitoring module that switches at single-pole double-throw switch (SPDT) two fixed contacts of the moving contact controlling single-pole double-throw switch (SPDT), a fixed contact of described single-pole double-throw switch (SPDT) is connected on the circuit between Charge Management unit and rectification unit output, and its another fixed contact is connected with rechargeable battery positive pole.The present invention is contacted with two fixed contacts respectively by the moving contact of single-pole double-throw switch (SPDT), realizes on-Line Monitor Device and to power the switching of electric energy.
Compared with prior art, the present invention has following beneficial effect: (1) the present invention utilizes the induced voltage of ground wire and induced current to provide electric energy for on-line monitoring equipment in transmission line, in transmission line, ground wire is maked somebody a mere figurehead, unearthed and be connected directly between on steel tower, voltage difference is there is between ground wire and steel tower, the present invention utilizes this voltage difference for the energy supply of on-line monitoring equipment, getting from bus high-pressure side because the present invention is not direct can, so Insulation Problems can better solve, have good stability and continuation, cost is lower, can large-scale promotion.
(2) the present invention includes pressurizer and rectification unit, the energy process that line influence obtains by pressurizer and rectification unit is directly online equipment energy supply later, can reduce the fluctuation of ground wire voltage, electric current.
(3) the present invention also comprises Charge Management unit and Power Management Unit, wherein, Charge Management unit can monitor rechargeable battery state automatically, and control to carry out discharge and recharge to rechargeable battery, Power Management Unit can according to the situation of line current and load, the operating state of timely adjustment rechargeable battery, ensures system reliable power supply, and then makes the present invention stable electric energy can be provided to export to on-Line Monitor Device.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Name in accompanying drawing corresponding to Reference numeral is called: 1, overhead ground wire, L1, the first inductance, L2, the second inductance, K1, single-pole single-throw switch (SPST), K2, single-pole double-throw switch (SPDT).
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, on-line monitoring device for transmission line based on ground wire induction gets energy system, comprise pressurizer, rectification unit, rechargeable battery, on-Line Monitor Device, Charge Management unit, Power Management Unit and overhead ground wire 1, wherein, overhead ground wire 1 is for being erected on ground wire on steel tower and built on stilts.Overhead ground wire 1 is connected with surge protection unit, surge protection unit preferably adopts lightning arrester.Rectification unit adopts bridge rectifier, it is provided with two inputs and two outputs, rectification unit input is connected with pressurizer, its another input end grounding, the other end that pressurizer connects rectification unit end is relatively connected on overhead ground wire 1, circuit between pressurizer and overhead ground wire 1 is in series with the first inductance L 1, in the present embodiment, the first inductance L 1 flows through for limiting lightning current as flow restricter.
The both positive and negative polarity of rechargeable battery is connected with two outputs of rectification unit respectively, Charge Management unit is located on the circuit between rechargeable battery positive pole and rectification unit output, Charge Management unit is for monitoring charged battery voltage and controlling circuit on-off between rechargeable battery positive pole and rectification unit output, if Charge Management unit rechargeable battery when concrete control is saturated, Charge Management unit makes circuit between rechargeable battery positive pole and rectification unit output disconnect, if rechargeable battery unsaturation, Charge Management unit makes circuit between rechargeable battery positive pole and rectification unit output connect.Circuit between Charge Management unit and rectification unit output is in series with the second inductance L 2, second inductance L 2 and reduces voltage fluctuation for flat ripple reactance.
The two ends of on-Line Monitor Device are connected on two outputs of rectification unit, Power Management Unit is located on the circuit between on-Line Monitor Device input and rectification unit output, Power Management Unit is provided with monitoring rectification unit output voltage, and when rectification unit output voltage departs from set point, on-Line Monitor Device input is switched to rechargeable battery positive pole.As preferably, in the present embodiment, the set point of rectification unit output voltage is 5V.
Embodiment 2
The present embodiment has carried out following restriction further on the basis of embodiment 1: the Charge Management unit of the present embodiment comprises single-pole single-throw switch (SPST) K1 and power supply monitoring module, and in the present embodiment, power supply monitoring module adopts existing techniques in realizing.The present embodiment forms charging paths at rectification unit output charged in parallel battery, is made up of single-pole single-throw switch (SPST) K1 and rechargeable battery.The control variables of single-pole single-throw switch (SPST) K1 is the charged state of rechargeable battery, is obtained by power supply monitoring module.When power supply monitoring module monitors is full state to rechargeable battery, at this moment the Logic judgment unit of power supply monitoring module exports " Y " value, controls single-pole single-throw switch (SPST) K1 and is in open position; When power supply monitoring module monitors to storage battery for underfill state time, at this moment the Logic judgment unit of power supply monitoring module exports " N " value, controls single-pole single-throw switch (SPST) K1 and is in closing position.
Embodiment 3
The present embodiment has carried out following further restriction on the basis of embodiment 1 or 2: the Power Management Unit of the present embodiment comprises single-pole double-throw switch (SPDT) K2 and voltage monitoring module, wherein, a fixed contact of single-pole double-throw switch (SPDT) K2 is connected on the circuit between Charge Management unit and rectification unit output, and its another fixed contact is connected with rechargeable battery positive pole.In the present embodiment, voltage monitoring module adopts existing techniques in realizing, and voltage monitoring module monitors rectification unit output voltage the moving contact controlling single-pole double-throw switch (SPDT) K2 switch at single-pole double-throw switch (SPDT) K2 two fixed contacts.The present embodiment is when embody rule, the control variables of single-pole double-throw switch (SPDT) K2 is the rectification unit output voltage that voltage monitoring module monitors arrives, when rectification unit output voltage is predeterminated voltage, voltage monitoring module judges to export " Y ", controls single-pole double-throw switch (SPDT) K2 and connects the single-pole double-throw switch (SPDT) K2 fixed contact that rectification unit output connects; When rectification unit output voltage departs from predeterminated voltage, voltage monitoring module judges to export " N ", controls single-pole double-throw switch (SPDT) K2 and connects the single-pole double-throw switch (SPDT) K2 fixed contact that rechargeable battery connects.
Above content is the further description done the present invention in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other execution modes drawn under technical scheme of the present invention, all should be included in protection scope of the present invention.

Claims (7)

1. the on-line monitoring device for transmission line based on ground wire induction gets energy system, it is characterized in that, comprise pressurizer, rectification unit, rechargeable battery, on-Line Monitor Device and the overhead ground wire (1) be erected on steel tower, described rectification unit is provided with two inputs and two outputs, rectification unit input is connected with pressurizer, its another input end grounding, the other end that pressurizer connects rectification unit end is relatively connected on overhead ground wire (1), the both positive and negative polarity of described rechargeable battery is connected with two outputs of rectification unit respectively, circuit between rechargeable battery positive pole and rectification unit output is provided with monitoring charged battery voltage, and control the Charge Management unit of circuit on-off between rechargeable battery positive pole and rectification unit output, the two ends of described on-Line Monitor Device are connected on two outputs of rectification unit, and the circuit between described on-Line Monitor Device input and rectification unit output is provided with monitors rectification unit output voltage and the Power Management Unit when rectification unit output voltage departs from set point, on-Line Monitor Device input being switched to rechargeable battery positive pole.
2. the on-line monitoring device for transmission line based on ground wire induction according to claim 1 gets energy system, and it is characterized in that, (1) is connected with surge protection unit to described overhead ground wire.
3. the on-line monitoring device for transmission line based on ground wire induction according to claim 2 gets energy system, and it is characterized in that, described surge protection unit is lightning arrester.
4. the on-line monitoring device for transmission line based on ground wire induction according to claim 1 gets energy system, it is characterized in that, circuit between described pressurizer and overhead ground wire (1) is in series with the first inductance (L1), the circuit between described Charge Management unit and rectification unit output is in series with the second inductance (L2).
5. the on-line monitoring device for transmission line based on ground wire induction according to claim 1 gets energy system, and it is characterized in that, described rectification unit is bridge rectifier.
6. get energy system according to the on-line monitoring device for transmission line based on ground wire induction in Claims 1 to 5 described in any one, it is characterized in that, described Charge Management unit comprises single-pole single-throw switch (SPST) (K1) and the whether saturated power supply monitoring module controlling single-pole single-throw switch (SPST) (K1) divide-shut brake of monitoring rechargeable battery.
7. get energy system according to the on-line monitoring device for transmission line based on ground wire induction in Claims 1 to 5 described in any one, it is characterized in that, described Power Management Unit comprises single-pole double-throw switch (SPDT) (K2) and monitoring rectification unit output voltage and the voltage monitoring module that switches at single-pole double-throw switch (SPDT) (K2) two fixed contacts of the moving contact controlling single-pole double-throw switch (SPDT) (K2), a fixed contact of described single-pole double-throw switch (SPDT) (K2) is connected on the circuit between Charge Management unit and rectification unit output, and its another fixed contact is connected with rechargeable battery positive pole.
CN201310401969.5A 2013-09-06 2013-09-06 Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction Active CN103474987B (en)

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