CN203434627U - Energy-obtaining system of power-transmission-line on-line monitoring device based on ground wire induction - Google Patents
Energy-obtaining system of power-transmission-line on-line monitoring device based on ground wire induction Download PDFInfo
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- CN203434627U CN203434627U CN201320552757.2U CN201320552757U CN203434627U CN 203434627 U CN203434627 U CN 203434627U CN 201320552757 U CN201320552757 U CN 201320552757U CN 203434627 U CN203434627 U CN 203434627U
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Abstract
The utility model discloses an energy-obtaining system of a power-transmission-line on-line monitoring device based on ground wire induction. The system comprises a voltage stabilizer, a rectification unit, a charging cell, an on-line monitoring device and an overhead ground wire. The rectification unit is provided with two input terminals and two output terminals. One input terminal of the rectification unit is connected with the voltage stabilizer and the other input terminal is grounded. The voltage stabilizer is connected to the overhead ground wire. A positive electrode and a negative electrode of the charging cell are connected with the two output terminals of the rectification unit. A charging management unit is arranged on a line between the positive electrode of the charging cell and the output terminals of the rectification unit. Two ends of the on-line monitoring device are connected to the two output terminals of the rectification unit respectively. A power supply management unit is arranged on a line between an input terminal of the on-line monitoring device and the output terminals of the rectification unit. According to the system of the utility model, an induction voltage and an induction current of the ground wire are used to provide power for the on-line monitoring device and energy is not directly acquired from a high voltage terminal of a bus; an insulating property is good; good stability and continuity are possessed; cost is low; the system can be widely popularized and applied.
Description
Technical field
The utility model relates to transmission line on-line monitoring field, and specifically the on-line monitoring device for transmission line based on ground wire induction is got energy system.
Background technology
On-line monitoring technique has the advantages such as automatic examination equipment state, monitor signal be continuous, is applied to more and more widely transmission line in recent years.According to the preliminary statistics, the on-Line Monitor Device type that is applied at present transmission line 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 causing because of electricity shortage accounts for the more than 40% of total failare.Energy supply problem has become the Main Bottleneck that restriction transmission line on-line monitoring technique further develops.
Getting of current power transmission circuit on-Line Monitor Device can mode has: solar energy+storage battery, wind energy+storage battery, by voltage transformer or current transformer on transmission line, get can etc.Wherein, solar electric power supply system generally comprises silicon solar cell, batteries and three parts of charge-discharge control circuit.Silicon solar cell only could generate electricity when illumination, do not possess the ability of preserving electric energy, in order to obtain the output of stable power supply, guarantee to power to the load incessantly, need to there be storage battery and silicon solar cell be connected in parallel (silicon solar cell charges to battery).In the situation that having illumination abundance, silicon solar cell simultaneously powers to the load, and one in the face of charge in batteries, at cloudy day or night by the storage battery energy that powers to the load.Storage battery can be selected lead acid accumulator, lithium battery, Ni-MH battery and nickel iron cell.Control conversion and the corresponding management strategy of solar electric power supply system different operating state realize 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, under normal voltage and normalized current, charges, 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 is inconvenient to must long-term stability operating in the online equipment of outdoor high-voltage end.In addition, from the general characteristic of storage battery, consider, the capacity of battery reduces with the reduction of temperature, lead-acid battery is particularly showing, the maximum operating temperature of ni-mh and nickel iron cell must not be over 40 ℃, and the price is rather stiff of jumbo lithium battery is subject to cost and holds quantitative limitation, be not suitable for being used as large capacity 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 many overcast and rainy foggy weather conditions in south, output power is obviously not enough.
Powered by wind energy system generally comprises small-sized fan, batteries and three parts of charge-discharge control circuit.Blower fan only could generate electricity when having wind, does not preserve the ability of electric energy, so for to load stable power-supplying, also need 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.While adopting wind energy to power to equipment, the output power of blower fan depends on local weather conditions, when windy, blower fan can be to load stable power-supplying, when in calm season or the less place of wind-force, powered by wind energy less stable, so powered by wind energy also has region and restriction in season.
Utilize the power taking of high-voltage capacitance dividing potential drop can thought be similar to electromagnetic induction get can, be all the idea of " drawing materials nearby ".There is radially-arranged alternating electric field around in high-tension line, relies on distributed capacitance or the direct-to-ground capacitance in all spaces of ring, can intercept and capture certain electric field energy, through treatment measures such as rectification, filtering and voltage stabilizings, then gives high-pressure side observation circuit energy supply.When practical application, by adjusting the high-voltage capacitance size of dividing potential drop, obtain different Voltage-outputs, thereby reach the power requirement of design.During voltage transformer power supply, because circuit travel line change in voltage is little, output energy is relevant with the high-voltage capacitance size of dividing potential drop, by capacitance partial pressure, can obtain more stable voltage, has circuit simple, lower-cost advantage.The shortcoming of voltage transformer power supply is that fail safe is not high enough, and reliability is lower, has certain work blind area (primary side instantaneous short circuit may make equipment normally not move), in addition, need to consider that stand-by power supply has also increased the complexity of system.How to guarantee the electrical isolation between energy supply circuit and follow-up work circuit, this requirement has 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 obtaining in this way, although can come Modulating Power to export by changing the size of capacitor C,, large selecting of electric capacity may produce harmonic wave, causes dividing potential drop unstable, affects subsequent conditioning circuit.
Because overhead transmission line itself is exactly energy transmission line, the energy of conventional current instrument transformer obtains from electrical network.For this reason, from the angle of practicality, many reports have proposed a kind of online electrical network energy supply scheme, adopt a special current transformer to obtain needed energy from hv transmission line, have simple in structure, be easy to realize and low cost and other advantages.Electric power system Current Transformer is that electrical network high voltage, large current information are delivered to metering, measuring instrument and the relaying protection of the secondary side of low-voltage, little electric current, a kind of special transformer of automatics.While using in electrical network, the function with transformer energy transmission, electrical network high voltage energy can be delivered to the secondary side of low electricity, and secondary side equipment and electrical secondary system and primary system high-tension apparatus can be isolated well aspect electric, guarantee secondary device and personal safety.Thereby, can utilize instrument transformer to get and can from circuit, obtain energy by equipment.When circuit adopts current transformer induction energy fetching, 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 is simple, safe advantage.During current transformer power supply, owing to obtaining energy from electrical network, its work is certain to be subject to the impact of power network current.Conventionally line current dynamic range is very large, causes this method to have technological difficulties, first when primary current lower (being low to moderate number peace), can not obtain enough energy, causes and gets and can leave " getting energy dead angle " by equipment; Secondly when primary current increases to thousands of peaces when above, get can instrument transformer generation high-pressure sharp pulse interference and damage, the especially interference to power supply and subsequent conditioning circuit that each device of secondary is caused.
Utility model content
The purpose of this utility model 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 to get energy system, it utilizes the induced voltage of ground wire and induced current to provide electric energy for on-line monitoring equipment, directly from bus high-pressure side, not getting can, there are good insulation property, and can guarantee to get and can stablize, continue.
The purpose of this utility model is achieved through the following technical solutions: the on-line monitoring device for transmission line based on ground wire induction is got energy system, comprise pressurizer, rectification unit, rechargeable battery, on-Line Monitor Device and be erected on the overhead ground wire on steel tower, described rectification unit is provided with two inputs and two outputs, input of rectification unit 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 the anodal and rectification unit output of rechargeable battery, 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 monitoring rectification unit output voltage and on-Line Monitor Device input is switched to the Power Management Unit of rechargeable battery positive pole when rectification unit output voltage departs from set point.When electric power system normally moves, because the locus between the every phase conductor of overhead transmission line and every ground wire is asymmetric, the current imbalance that every phase conductor flows through, exists capacitive lotus root to close with perceptual lotus root and closes between alternating current circuit and ground wire, produce electrostatic induction voltage and electromagnetic induction voltage on ground wire.Between two ground wires, can form loop by steel tower and earth point, form circulation loop between the line of two ground wires; In addition, every ground wire be take respectively again the earth as loop, forms induced current loop.The electrostatic induction voltage of ground wire is because every lightning conducter is asymmetric to three-phase conducting wire physical dimension spatially, high-voltage conducting wires produces to its surrounding space the voltage to earth that high voltage electric field causes, namely wire and ground wire capacitive coupling and the electrostatic induction voltage that produces on ground wire, its value only depends on the size of ground wire space potential of living in.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 irrelevant with current in wire, and irrelevant (but when the two electrostatic induction voltages stacks, the quantity of electric charge is made vector and superposeed, because of the quantity of electric charge with line length
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 on ground wire, to be produced 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; Irrelevant with bus voltage, and be directly proportional to the length of power line, its value superposes along lightning conducter, therefore, and also referred to as induced electromotive force.When insulation lightning conducter one point earth, do not change the electrical potential difference at its two ends, only above earth potential be distributed with variation, thereby there is no induced current.Wherein, pressurizer is used for regulation voltage within the specific limits, and when voltage surpasses certain value, automatic shutoff circuit, protects the utility model to get the effect of energy system thereby play simultaneously, and rectification unit becomes the alternating voltage on ground wire into direct voltage.
In order to discharge lightning current, the overcurrent that prevents from being struck by lightning flows through the energy system of getting of the present utility model, is connected with surge protection unit on described overhead ground wire.
Further, described surge protection unit is lightning arrester.
On circuit between described pressurizer and overhead ground wire, be in series with the first inductance, on the circuit between described Charge Management unit and rectification unit output, be in series with the second inductance.Wherein, the first inductance is as flow restricter, and it is mainly used in limiting lightning current and flows through, and the second inductance is for flat ripple reactance, and then minimizing 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 of controlling single-pole single-throw switch (SPST) divide-shut brake of monitoring rechargeable battery.Wherein, the normal phase of single-pole single-throw switch (SPST) 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.
Further, described power supply monitoring module adopts SGM803 chip.
Described Power Management Unit comprises single-pole double-throw switch (SPDT) and monitoring rectification unit output voltage and controls the moving contact of single-pole double-throw switch (SPDT) in the voltage monitoring module of two fixed contacts switchings of 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 is anodal.The utility model contacts with two fixed contacts respectively by the moving contact of single-pole double-throw switch (SPDT), realizes the switching of on-Line Monitor Device power supply electric energy.
Further, described voltage monitoring module adopts CE8808 chip.
Compared with prior art, the utlity model has following beneficial effect: (1) the utility model 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 built on stilts, unearthed and be directly connected on steel tower, between ground wire and steel tower, there is voltage difference, the utility model utilizes this voltage difference for the energy supply of on-line monitoring equipment, because the utility model is not directly got energy from bus high-pressure side, so Insulation Problems can better solve, there is good stability and continuation, cost is lower, can large-scale promotion.
(2) the utility model comprises pressurizer and rectification unit, and the energy process that pressurizer and rectification unit obtain line influence directly for online equipment energy supply, can reduce the fluctuation of ground wire voltage, electric current later.
(3) the utility model also comprises Charge Management unit and Power Management Unit, wherein, Charge Management unit can be monitored rechargeable battery state automatically, and control discharges and recharges rechargeable battery, Power Management Unit can be according to the situation of line current and load, adjust in time the operating state of rechargeable battery, guarantee system reliable power supply, and then make the utility model provide stable electric energy output to on-Line Monitor Device.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In accompanying drawing, the corresponding name of 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 utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, on-line monitoring device for transmission line based on ground wire induction is got 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 steel tower and built on stilts ground wire.On overhead ground wire 1, be 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, input of rectification unit 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, on circuit between pressurizer and overhead ground wire 1, be in series with the first inductance L 1, in the present embodiment, the first inductance L 1 is used for limiting lightning current as flow restricter and flows through.
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 used for monitoring charged battery voltage and controls 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 disconnects circuit between rechargeable battery positive pole and rectification unit output, if rechargeable battery unsaturation, Charge Management unit is connected circuit between rechargeable battery positive pole and rectification unit output.On circuit between Charge Management unit and rectification unit output, be in series with the second inductance L 2, the second inductance L 2 and reduce 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 further restriction 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, in the present embodiment, power supply monitoring module adopts existing techniques in realizing, and power supply monitoring module preferably adopts SGM803 chip.The present embodiment forms charging paths at rectification unit output charged in parallel battery, single-pole single-throw switch (SPST) K1 and rechargeable battery, consists of.The control variables of single-pole single-throw switch (SPST) K1 is the charged state of rechargeable battery, by power supply monitoring module, obtains.When power supply monitoring module monitors is full state to rechargeable battery, at this moment the logic of power supply monitoring module judgement unit output " Y " value, controls single-pole single-throw switch (SPST) K1 and is in open position; When power supply monitoring module monitors to storage battery when the underfill state, at this moment the logic of power supply monitoring module judgement unit output " 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 is anodal.In the present embodiment, voltage monitoring module adopts existing techniques in realizing, voltage monitoring module preferably adopts CE8808 chip, and voltage monitoring module monitors rectification unit output voltage the moving contact of controlling single-pole double-throw switch (SPDT) K2 switch at two fixed contacts of single-pole double-throw switch (SPDT) K2.The present embodiment is when concrete application, 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 judgement output " Y ", controls single-pole double-throw switch (SPDT) K2 and connects the single-pole double-throw switch (SPDT) K2 fixed contact connecting on rectification unit output; When rectification unit output voltage departs from predeterminated voltage, voltage monitoring module judgement output " N ", controls single-pole double-throw switch (SPDT) K2 and connects the single-pole double-throw switch (SPDT) K2 fixed contact connecting on rechargeable battery.
Above content is the further description of the utility model being done in conjunction with concrete preferred implementation, can not assert that embodiment of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, not departing from other execution modes that draw under the technical solution of the utility model, all should be included in protection range of the present utility model.
Claims (9)
1. the on-line monitoring device for transmission line based on ground wire induction is got energy system, it is characterized in that, comprise pressurizer, rectification unit, rechargeable battery, on-Line Monitor Device and be erected on the overhead ground wire (1) on steel tower, described rectification unit is provided with two inputs and two outputs, input of rectification unit 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 the anodal and rectification unit output of rechargeable battery, 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 monitoring rectification unit output voltage and on-Line Monitor Device input is switched to the Power Management Unit of rechargeable battery positive pole when rectification unit output voltage departs from set point.
2. the on-line monitoring device for transmission line based on ground wire induction according to claim 1 is got energy system, it is characterized in that, described overhead ground wire is connected with surge protection unit on (1).
3. the on-line monitoring device for transmission line based on ground wire induction according to claim 2 is got energy system, 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 is got energy system, it is characterized in that, on circuit between described pressurizer and overhead ground wire (1), be in series with the first inductance (L1), on the circuit between described Charge Management unit and rectification unit output, be 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 is got energy system, it is characterized in that, described rectification unit is bridge rectifier.
6. according to the on-line monitoring device for transmission line based on ground wire induction described in any one in claim 1～5, get energy system, 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 of controlling single-pole single-throw switch (SPST) (K1) divide-shut brake of monitoring rechargeable battery.
7. the on-line monitoring device for transmission line based on ground wire induction according to claim 6 is got energy system, it is characterized in that, described power supply monitoring module adopts SGM803 chip.
8. according to the on-line monitoring device for transmission line based on ground wire induction described in any one in claim 1～5, get energy system, it is characterized in that, described Power Management Unit comprises single-pole double-throw switch (SPDT) (K2) and monitoring rectification unit output voltage and controls the moving contact of single-pole double-throw switch (SPDT) (K2) in the voltage monitoring module of two fixed contacts switchings of 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 is anodal.
9. the on-line monitoring device for transmission line based on ground wire induction according to claim 8 is got energy system, it is characterized in that, described voltage monitoring module adopts CE8808 chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320552757.2U CN203434627U (en) | 2013-09-06 | 2013-09-06 | Energy-obtaining system of power-transmission-line on-line monitoring device based on ground wire induction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320552757.2U CN203434627U (en) | 2013-09-06 | 2013-09-06 | Energy-obtaining system of power-transmission-line on-line monitoring device based on ground wire induction |
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| CN203434627U true CN203434627U (en) | 2014-02-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474987A (en) * | 2013-09-06 | 2013-12-25 | 国家电网公司 | Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction |
| CN104485729A (en) * | 2014-11-21 | 2015-04-01 | 成都嵌智捷科技有限公司 | High-reliability power supply circuit suitable for embedded field |
-
2013
- 2013-09-06 CN CN201320552757.2U patent/CN203434627U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474987A (en) * | 2013-09-06 | 2013-12-25 | 国家电网公司 | Electric transmission line on-line monitoring device energy obtaining system based on ground wire induction |
| 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 |
| CN104485729A (en) * | 2014-11-21 | 2015-04-01 | 成都嵌智捷科技有限公司 | High-reliability power supply circuit suitable for embedded field |
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