CN112993761A - High tension power line energy taking device on spot based on corona discharge principle - Google Patents
High tension power line energy taking device on spot based on corona discharge principle Download PDFInfo
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- CN112993761A CN112993761A CN202110184508.1A CN202110184508A CN112993761A CN 112993761 A CN112993761 A CN 112993761A CN 202110184508 A CN202110184508 A CN 202110184508A CN 112993761 A CN112993761 A CN 112993761A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T19/00—Devices providing for corona discharge
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Abstract
The invention provides a high-voltage transmission line on-site energy taking device based on a corona discharge principle, which comprises a power supply box, wherein an insulating sleeve and an insulator are arranged on two sides of the power supply box, the root parts of hardware fittings at the lower ends of the insulating sleeve and the insulator are connected with a conductive mounting lock catch, the conductive mounting lock catch is hung on the high-voltage transmission line and connected with the power supply box, the top ends of the insulating sleeve and the insulator are connected with voltage-sharing balls, an ultra-fine stainless steel corona wire is connected between the two voltage-sharing balls, an insulating circuit board is arranged inside the power supply box, a corona wire inlet terminal is arranged on the insulating circuit board, an anode pin of the corona wire inlet terminal is connected with a negative pin of the insulating circuit board after being connected with an energy taking, protecting and converting circuit, the ultra-fine stainless steel corona wire is connected, the corresponding conductive installation lock catch is connected with the negative or positive pin of the corona wire incoming terminal through a second electric insulation flying wire. The device can stably supply power for the fault indicator along the overhead transmission line.
Description
Technical Field
The invention relates to the technical field of local energy taking of high-voltage transmission lines, in particular to a local energy taking device of a high-voltage transmission line based on a corona discharge principle.
Background
The high-voltage transmission line is a channel for transmitting electric energy, in particular to an overhead transmission line, and because the line is long, the number of insulators used is large, and the conditions of geology, weather and weather along the high-voltage line are greatly different, the probability of faults of one-phase grounding, multi-phase short circuit grounding, wire fusing and the like of the transmission line is high. And for the automatic recovery type fault, automatic or manual reclosing is adopted. However, when an unrecoverable fault occurs, the method firstly needs to quickly react, analyze a fault recording waveform, estimate and locate a fault point, and then reproduce a field to search and repair the fault, so as to shorten the line power failure time as much as possible and reduce the power failure loss.
Obviously, conventional line differential protection is able to indicate a faulty line, but cannot give a specific faulty section. Although fault recording can calculate fault points on the basis of analyzing line fault waveforms, the line structure, the load types, the number, the distribution places, the fault types and other situations are different, and it is difficult to perform positioning analysis on the fault points. Generally, once a line has a fault which cannot be automatically recovered, a line patrol worker is required to sequentially troubleshoot the fault along the line, and since no specific target line patrol is available, the efficiency is low, the labor intensity is high, a long time is required, and the power failure loss is high. Unmanned aerial vehicle patrols line because the influence of factors such as weather, topography and landform also has unmanned aerial vehicle to lose the antithetical couplet, see a great deal of weak points such as target unclear. Therefore, intelligent line fault indicating devices are developed at home and abroad. Generally, a device is arranged at a certain distance along a power transmission line, the circulating currents of the lines in respective sections are respectively monitored, networking communication and data exchange are carried out by utilizing radio frequency wireless communication or an optical fiber technology, data are comprehensively analyzed, and fault points are roughly positioned, so that the intelligent line fault indicating device can greatly improve the accuracy and timeliness of fault identification and fault positioning.
However, each line fault intelligent indicating device needs to use a power supply to complete data acquisition, preliminary analysis, networking communication and other work. The existing line fault intelligent indicating device has the following modes in power supply: the battery or the combined structure of the storage battery and a photovoltaic panel, a micro wind power generator, a current transformer and the like. Generally, a voltage transformer is not adopted because the cost is too high and the maintenance is difficult. The inventor of the invention finds that battery energy supply is unrealistic due to long line and more detection points. The storage battery is combined with the photovoltaic panel, and can provide working electric energy for a longer period of time, but the photovoltaic panel is slightly poor at night, and particularly in long rainy days in winter, the energy provided by the photovoltaic panel is extremely limited. The actual operation of the intelligent line fault indicating device shows that even if the capacity of the input storage battery is large, the electric energy stored in the storage battery is consumed before the winter is finished. The reason for this is that the storage battery itself has a certain self-discharge characteristic due to insufficient sunlight, and the electric energy may disappear relatively quickly even when no load is applied after charging. Miniature wind-powered electricity generation is bulky, and inconvenient the installation is on high voltage transmission line, and the instability of itself also can lead to the breach of supplying power of line fault intelligent indicating device.
The combined structure of the storage battery and the current transformer adopts the mutual inductance principle of the transformer, large current flows into a single turn at the primary side of the current transformer, low-voltage small current is output at the secondary side, and after conversion, storage and the like, a reliable driving power supply is provided for the intelligent line fault indicating device. However, the current in the power transmission line changes continuously with the size of the power load, and has certain instability, which increases the risk of power supply gaps and increases the difficulty of power supply development. Moreover, the current transformer works in a power frequency range, the iron core and the winding are required to have large mass, and the anti-saturation structure is complex, so that the manufacturing and installation difficulty is high.
For the current transformer type local power supply adopting the transformer mutual inductance principle, the significant disadvantage is that when the load current on the line is less than a certain value, the secondary side output amplitude of the current transformer becomes very low, and the electric energy cannot be effectively output, so that the problem needs to be solved.
Disclosure of Invention
The invention provides a high-voltage power transmission line on-site energy taking device based on a corona discharge principle, aiming at the technical problems of the existing high-voltage power transmission line on-site energy taking mode.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a high tension power line on-spot energy taking device based on corona discharge principle, includes the power pack, power pack top both sides are equipped with bushing and insulator, the lower extreme gold utensil root of bushing and insulator is connected with electrically conductive installation hasp, electrically conductive installation hasp keeps insulating with bushing and insulator, electrically conductive installation hasp articulates on high tension power line and is connected with the power pack that is located high tension power line below, bushing's top is connected with first voltage-sharing ball, the top of insulator is connected with second voltage-sharing ball, be connected with the superfine stainless steel corona wire of parallel arrangement in high tension power line top between first voltage-sharing ball and the second voltage-sharing ball, the inside insulating circuit board that is equipped with of power pack, be equipped with corona wire inlet terminal P1 on the insulating circuit board, energy taking circuit on the positive pole pin connection insulating circuit board of corona wire inlet terminal P1, Protection circuit and power conversion circuit back are connected with corona wire inlet terminal P1's negative pole pin, superfine stainless steel corona wire loops through inside guide arm of insulating sleeve and first insulating flying lead and corona wire inlet terminal P1's anodal pin or negative pole pin and is connected, corresponds electrically conductive installation hasp passes through the second insulating flying lead and is connected with corona wire inlet terminal P1's negative pole pin or anodal pin.
According to the high-voltage transmission line on-site energy taking device based on the corona discharge principle, when the high-voltage transmission line has high voltage, the high-voltage electricity reaches the ultra-fine stainless steel corona wire through the insulating circuit board and then is corona, and after energy taking, protection and power supply conversion are carried out on the corona current flowing through the insulating circuit board, the high-voltage electricity can be used for supplying power to small loads such as a fault indicator and a wireless sensor node along the overhead transmission line. Compared with the prior art, the local energy taking device utilizes the characteristics that the high-voltage line has high operating voltage and the pointed protruding part is easy to generate corona discharge, designs the local energy taking device based on corona discharge, the corona discharge often occurs at the pointed protruding part of the high-voltage conductor, namely, the electrode needing generating the corona is small, the quality is small, the weight is light and low in cost, and utilizes the characteristic that the voltage amplitude of a transmission line is not changed with the effective value, so that the primary electric energy obtained by the device has high stability, unlike a battery, the device needs not to be replaced, and unlike photovoltaic and micro wind power, the device is not stable, unlike a current transformer type local energy taking device is restricted by the size of a user load, namely the size of line alternating current, and does not need to distribute an ultra-large area capacitor plate like a capacitive local.
It should be noted that, the invention does not use the distributed capacitance voltage dividing mode between the high voltage line and the ground to obtain the power, so the invention adopts the principle that the extra fine stainless steel corona wire is added on the high voltage line, the surface electric field intensity is high and the corona discharge is easy to occur, the interception and the conversion of the electric energy are carried out, not only the electric energy on the alternating current power line can be intercepted, but also the electric energy on the direct current power line can be intercepted. Moreover, the local energy taking device overcomes the defect that the current transformer type local power supply cannot effectively output electric energy when the line has small current, and improves the power supply reliability, so the local energy taking device is more stable and portable in power supply and low in cost.
Furthermore, the power supply box is made of light, conductive and rustproof materials, and corners are chamfered.
Furthermore, the insulating sleeve and the insulator are provided with umbrella skirt structures.
Further, the radius of the first voltage-sharing ball and the radius of the second voltage-sharing ball are larger than or equal to the radius of the high-voltage transmission line.
Furthermore, the diameter of the superfine stainless steel corona wire is 0.05-0.1 mm.
Furthermore, after a positive electrode pin of the corona wire inlet terminal P1 is sequentially connected in series with a self-recovery fuse FU0, a fuse FU1 and a corona-induced resistor R0, the wires return to a negative electrode pin of the corona wire inlet terminal P1; the upper end of the corona inducing resistor R0 is connected with the anode of a non-return diode D5, the cathode of the non-return diode D5 is connected with the anode of a capacitor C3, the cathode of the capacitor C3 is connected with the cathode pin of a corona wire incoming terminal P1, the positive end and the negative end of the capacitor C3 are connected with a voltage divider sampling resistor R5 and a voltage divider sampling resistor R6 which are sequentially connected in series in parallel, and a transient overvoltage suppression diode D21 is further connected between a connection node P06 between the voltage divider sampling resistors R5 and R6 and the cathode pin of the corona wire incoming terminal P1; the upper end and the lower end of the corona inducing resistor R0 are connected with forward clamping diode groups D6-Dn in parallel, and the forward clamping diode groups D6-Dn are formed by connecting a plurality of ultrafast recovery diodes with the same model in series in sequence; the positive electrode of the capacitor C3 is connected with the input end of a three-terminal power supply VR1, the output end of the three-terminal power supply VR1 is connected with a first pin of a power supply outlet terminal P2, and a second pin of the power supply outlet terminal P2 is connected with a negative electrode pin of a corona wire inlet terminal P1; the output end of the three-terminal power supply VR1 is also sequentially connected with a charging current-limiting resistor R1, sliding switches S2 and S1, an on-board storage battery BT1 in series and connected with a voltage-stabilizing capacitor C1 in parallel, and the negative electrode of the on-board storage battery BT1 is connected with the negative electrode pin of a corona wire inlet terminal P1; a voltage stabilizing capacitor C2 and an on-board load terminal P3 are connected between the connection node P12 between the slide switches S2 and S1 and the negative terminal of the corona wire inlet terminal P1.
Further, the upper end and the lower end of the corona inducing resistor R0 are also connected with a single reverse conducting diode D0 in an anti-parallel manner.
Furthermore, the upper end and the lower end of the corona inducing resistor R0 are connected in parallel with a piezoresistor R4.
Further, the positive end and the negative end of the capacitor C3 are connected in parallel with an overvoltage transient suppression diode D20.
Further, when the high-voltage transmission line has positive polarity and high voltage, the second insulating flying line is connected with a positive electrode pin of the corona wire incoming terminal, and the first insulating flying line is connected with a negative electrode pin of the corona wire incoming terminal; when the high-voltage transmission line is provided with negative polarity high voltage, the first insulating flying line is connected with a positive electrode pin of a corona wire incoming terminal, and the second insulating flying line is connected with a negative electrode pin of the corona wire incoming terminal; when the high-voltage power transmission line is provided with a power frequency alternating current high voltage, the first insulation flying line and the second insulation flying line are respectively and correspondingly connected with a positive electrode pin or a negative electrode pin of a corona wire incoming terminal.
Drawings
Fig. 1 is a schematic structural diagram of an in-situ energy-taking device for a high-voltage transmission line based on a corona discharge principle, provided by the invention.
In the figure, 1, a power supply box; 2. an insulating sleeve; 3. an insulator; 4. installing a lock catch in a conductive manner; 5. a high voltage transmission line; 6. a first pressure equalizing ball; 7. a second pressure equalizing ball; 8. superfine stainless steel corona wires; 9. an insulating circuit board; 10. shielding the wiring on the board; 11. a first insulating flying lead; 12. and a second insulated flying lead.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the invention provides a high voltage transmission line energy-taking device based on corona discharge principle, comprising a power supply box 1, wherein an insulating sleeve 2 and an insulator 3 are arranged on two sides above the power supply box 1, the root of the lower end hardware of the insulating sleeve 2 and the insulator 3 is connected with a conductive mounting lock catch 4, the conductive mounting lock catch 4 is insulated from the insulating sleeve 2 and the insulator 3, for example, the conductive mounting lock catch is insulated from a guide rod inside the insulating sleeve 2, the conductive mounting lock catch 4 is hung on the high voltage transmission line 5 and is connected with the power supply box 1 below the high voltage transmission line 5, namely, the power supply box 1 can be stably hung below a line of a high voltage transmission line 5 needing energy-taking through the conductive mounting lock catch 4, the top end of the insulating sleeve 2 is connected with a first voltage-sharing ball 6, the top end of the insulator 3 is connected with a second voltage, be connected with the superfine stainless steel corona wire 8 of parallel arrangement in high tension transmission line 5 top between first voltage-sharing ball 6 and the second voltage-sharing ball 7, power pack 1 is inside to be equipped with insulating circuit board 9, be equipped with corona wire incoming wire terminal P1 on insulating circuit board 9, corona wire incoming wire terminal P1's positive pole pin (1 st pin) is connected with corona wire incoming wire terminal P1's negative pole pin (2 nd pin) after connecting on insulating circuit board 9 and is got can circuit, protection circuit and power conversion circuit, corona wire incoming wire terminal P1's 2 nd pin still is connected with shielding walk line (reference ground) 10 on the board on insulating circuit board 9, superfine stainless steel corona wire 8 loops through insulating sleeve 2 inside guide arm and first insulation fly 11 and is connected with corona wire incoming wire terminal P1's positive pole pin or negative pole pin, the corresponding electrically conductive installation 4 is connected with corona wire incoming wire terminal P1's negative pole pin or positive pole pin through second hasp insulation fly 12, namely: when the superfine stainless steel corona wire 8 is connected with the positive pin of the corona wire inlet terminal P1 sequentially through the guide rod and the first insulating flying lead 11 in the insulating sleeve 2, the corresponding conductive mounting lock catch 4 is connected with the negative pin of the corona wire inlet terminal P1 through the second insulating flying lead 12; on the contrary, when superfine stainless steel corona wire 8 loops through the inside guide arm of insulating sleeve 2 and first insulating flying lead 11 and is connected with corona wire inlet terminal P1's negative pole pin, correspond electrically conductive installation hasp 4 is connected with corona wire inlet terminal P1's positive pole pin through second insulating flying lead 12.
According to the high-voltage transmission line on-site energy taking device based on the corona discharge principle, when the high-voltage transmission line has high voltage, the high-voltage electricity reaches the ultra-fine stainless steel corona wire through the insulating circuit board and then is corona, and after energy taking, protection and power supply conversion are carried out on the corona current flowing through the insulating circuit board, the high-voltage electricity can be used for supplying power to small loads such as a fault indicator and a wireless sensor node along the overhead transmission line. Compared with the prior art, the local energy taking device utilizes the characteristics that the high-voltage line has high operating voltage and the pointed protruding part is easy to generate corona discharge, designs the local energy taking device based on corona discharge, the corona discharge often occurs at the pointed protruding part of the high-voltage conductor, namely, the electrode needing generating the corona is small, the quality is small, the weight is light and low in cost, and utilizes the characteristic that the voltage amplitude of a transmission line is not changed with the effective value, so that the primary electric energy obtained by the device has high stability, unlike a battery, the device needs not to be replaced, and unlike photovoltaic and micro wind power, the device is not stable, unlike a current transformer type local energy taking device is restricted by the size of a user load, namely the size of line alternating current, and does not need to distribute an ultra-large area capacitor plate like a capacitive local.
It should be noted that, the invention does not use the distributed capacitance voltage dividing mode between the high voltage line and the ground to obtain the power, so the invention adopts the principle that the extra fine stainless steel corona wire is added on the high voltage line, the surface electric field intensity is high and the corona discharge is easy to occur, the interception and the conversion of the electric energy are carried out, not only the electric energy on the alternating current power line can be intercepted, but also the electric energy on the direct current power line can be intercepted. Moreover, the local energy taking device overcomes the defect that the current transformer type local power supply cannot effectively output electric energy when the line has small current, and improves the power supply reliability, so the local energy taking device is more stable and portable in power supply and low in cost.
As a specific embodiment, the power supply box 1 is made of light, conductive and rustproof materials, and is light and thin, the height is as low as possible, and the corners are chamfered to ensure no corona under the normal voltage of the system.
As an embodiment, please refer to fig. 1, the insulating sleeve 2 and the insulator 3 have a shed structure to prevent the surfaces of the insulating sleeve 2 and the insulator 3 from being affected by moisture and high voltage current leakage. The heights of the upper-end hardware fittings of the insulating sleeve 2 and the insulator 3 are determined according to the energy taking size, and the higher the height is, the more energy is taken.
As a specific example, the radii of the first voltage-sharing ball 6 and the second voltage-sharing ball 7 are greater than or equal to the radius of the high-voltage transmission line 5, so that the situation that the electric field at two ends of the ultra-fine stainless steel corona wire 8 is higher than that at the middle part and corona first can be avoided, the overall corona of the whole ultra-fine stainless steel corona wire except for the two ends can be ensured, and the length of the corona wire can be shortened under the same power requirement.
In a specific embodiment, the diameter of the ultrafine stainless steel corona wire 8 is 0.05-0.1 mm, so that the mechanical tensile strength of the ultrafine stainless steel corona wire 8 can be ensured, and the ultrafine stainless steel corona wire has a low corona voltage, a soft corona discharge strength and a high corona discharge pulse density. Of course, the ultra-fine stainless steel corona wire 8 can be replaced by other conductor materials with higher mechanical strength and stronger corrosion resistance, the diameter of the ultra-fine stainless steel corona wire can be thinner, the length depends on the energy extraction size, and the longer the length, the more the energy extraction. In summary, one principle is: the higher the high voltage power line 5 carries a high voltage rating, the thinner the diameter, the longer the length, and the closer the distance from the high voltage power line 5 of the very fine stainless steel corona wire 8.
As a specific embodiment, referring to fig. 1, after a positive terminal, i.e., a 1 st pin, of the corona wire inlet terminal P1 is sequentially connected in series with a self-recovery fuse FU0, a fuse FU1, and a corona-induced resistor R0, a wire is routed back to a negative terminal, i.e., a 2 nd pin, of the corona wire inlet terminal P1; the upper end of the corona inducing resistor R0 is connected with the anode of a non-return diode D5, the cathode of the non-return diode D5 is connected with the anode of a capacitor C3, the cathode of the capacitor C3 is connected with the cathode pin of a corona wire incoming terminal P1, the positive end and the negative end of the capacitor C3 are connected with a voltage divider sampling resistor R5 and a voltage divider sampling resistor R6 which are sequentially connected in series in parallel, and a transient overvoltage suppression diode D21 is further connected between a connection node P06 between the voltage divider sampling resistors R5 and R6 and the cathode pin of the corona wire incoming terminal P1; the upper end and the lower end of the corona inducing resistor R0 are connected with forward clamping diode groups D6-Dn in parallel, and the forward clamping diode groups D6-Dn are formed by connecting a plurality of ultrafast recovery diodes with the same model in series in sequence; the positive electrode of the capacitor C3 is connected with the input end of a three-terminal power supply VR1, the output end of the three-terminal power supply VR1 is connected with a first pin of a power supply outlet terminal P2, and a second pin of the power supply outlet terminal P2 is connected with a negative electrode pin of a corona wire inlet terminal P1; the output end of the three-terminal power supply VR1 is also sequentially connected with a charging current-limiting resistor R1, sliding switches S2 and S1, an on-board storage battery BT1 in series and connected with a voltage-stabilizing capacitor C1 in parallel, and the negative electrode of the on-board storage battery BT1 is connected with the negative electrode pin of a corona wire inlet terminal P1; a voltage stabilizing capacitor C2 and an on-board load terminal P3 are connected between the connection node P12 between the slide switches S2 and S1 and the negative terminal of the corona wire inlet terminal P1. The corona inducing resistor R0, the non-return diode D5 and the capacitor C3 form an energy-taking circuit, the three-terminal power supply VR1 connected with the positive electrode of the capacitor C3, the power outlet terminal P2, the charging current-limiting resistor R1, the sliding switches S2 and S1, the voltage-stabilizing capacitor C1, the voltage-stabilizing capacitor C2 and the on-board load terminal P3 form a power conversion circuit, and the positive clamping diode groups D6-Dn connected with the upper end and the lower end of the corona inducing resistor R0 in parallel form a protection circuit; and the on-board storage battery BT1 is float charged during the closing period of the slide switches S2 and S1, so that a certain continuous power supply time can be ensured after the high-voltage power transmission line is completely powered off, and short-time power is provided for short-time communication after power failure of power utilization equipment such as a line fault indicator and the like.
In the above embodiment, the resistance of the corona inducing resistor R0 is generally greater than 1M ohm, so that a discharge channel is provided for a corona current with a very small amplitude, the requirement for the operating frequency of other ultrafast recovery diodes is reduced, too much corona current is not discharged, and the efficiency of corona energy extraction is reduced.
Specifically, in the above embodiment, the number of diodes connected in series in the forward clamping diode groups D6-Dn depends on the voltage requirement of the input terminal of the three-terminal power supply VR1, and the voltage of the input terminal of the three-terminal power supply VR1 is higher as the number of diodes connected in series is larger. In one embodiment, the number of diodes connected in series in the forward clamping diode groups D6-Dn is 10, that is, the forward clamping diode groups D6-D15, and the maximum voltage at the input end of the three-terminal power supply VR1 is 6.3V, and the voltage at the output end thereof may be 5V or 3.3V.
Specifically, in the above embodiment, the rated current of each diode in the forward clamping diode groups D6 to Dn depends on the diameter and length of the fine stainless steel corona wire 8 and the distance from the surface of the high voltage transmission line 5. In one embodiment, the rated current of each diode in the forward clamping diode groups D6-Dn is 1.5-2 times larger than the maximum corona current of the extra-fine stainless steel corona wire 8 in any weather condition, so as to ensure that each diode does not have overcurrent breakdown.
Specifically, in the above embodiment, when the high voltage power line 5 has a certain high voltage, the charge on the high voltage power line 5 flows into the corona wire inlet terminal P1 along the second insulation fly 12, and then flows through the self-recovery fuse FU0, the fuse FU1, and the corona-induced resistance R0 in sequence, and then returns to the corona wire inlet terminal P1, and then reaches the ultra-fine stainless steel corona wire 8 along the first insulation fly 11 and the insulating sleeve 2, so as to generate corona discharge; corona current during corona discharge flows through a corona inducing resistor R0, positive voltage drops are generated at the upper end and the lower end of the corona inducing resistor R0, a non-return diode D5 charges a capacitor C3 for energy storage and filtering, and a three-terminal power supply VR1, a voltage stabilizing capacitor C1 and the like are used for forming stable direct current output voltage U2 for supplying power to an on-board load terminal P3 and a power output terminal P2 or charging and storing energy for an on-board storage battery BT1 for standby. After a voltage division point P06 between the voltage divider sampling resistors R5 and R6 is connected in parallel with the transient overvoltage suppression diode D21, the voltage divider sampling resistor can be input into a node P12 connected with an on-board load terminal P3 and an upper side pin of the voltage stabilizing capacitor C2; or the voltage can be input into an on-board load terminal P3, and the on-board load terminal P3 can be connected with an intelligent management device to collect and manage the voltage of each node.
In the above embodiment, each of the diodes in the forward clamping diode groups D6-Dn is an ultrafast recovery diode, for example, an HER208 type ultrafast recovery diode, so that when the capacitor C3 is charged by the corona current, the corona current only flows through one diode of the non-return diode D5, and the voltage drop generated thereby also has only one PN junction voltage drop, so that more small-amplitude corona electric energy can be intercepted by the circuit to reduce the corona intensity, thereby meeting the requirement of national standard on the corona intensity of hardware. The non-return diode D5 can also be implemented by the same ultrafast recovery diode.
In the above embodiment, the fuse FU1 has a slightly larger operating current than the self-recovery fuse FU0 to ensure that the self-recovery fuse FU0 operates when a small overcurrent occurs and the fuse FU1 operates to blow when a severe overcurrent occurs.
As a specific example, referring to fig. 1, the upper and lower ends of the halo inducing resistor R0 are also connected in parallel with a single reverse conducting diode D0 in an inverse direction, and the parameters of the reverse conducting diode D0 refer to the parameters of the diodes in the forward clamping diode groups D6-Dn, so that the component types of the power supply can be reduced, and the production is facilitated.
As a specific embodiment, referring to fig. 1, the upper and lower ends of the corona inducing resistor R0 are further connected in parallel with a voltage dependent resistor R4, so that an accidental large-capacity overcurrent release channel can be provided.
As a specific embodiment, referring to fig. 1, the positive and negative terminals of the capacitor C3 are further connected in parallel with an overvoltage suppression diode D20, the rated operating value of which is slightly higher than the clamping operating voltages of the forward clamping diode groups D6 to Dn, and the rated operating value of which is slightly lower than the input rated value of the three-terminal power supply VR 1. Specifically, when the voltage between the upper end and the lower end of the corona inducing resistor R0 is lower than the sum of the current voltage of the capacitor C3 and the forward conducting voltage of the non-return diode D5, the corona current only flows through the corona inducing resistor R0; when the voltage between the upper end and the lower end of the corona inducing resistor R0 is higher than the sum of the current voltage of the capacitor C3 and the forward conduction voltage of the non-return diode D5 and is lower than the sum of forward voltage drops of the series connection of the forward clamping diode groups D6-Dn, the corona current mainly passes through the non-return diode D5 and then charges the capacitor C3; when the voltage between the upper end and the lower end of the corona inducing resistor R0 is higher than the sum of the forward voltage drops of the series connection of the forward clamping diode groups D6-Dn, the forward clamping diode groups D6-Dn clamp and act, the voltage between the upper end and the lower end of the corona inducing resistor R0 is clamped and limited within the rated values of the three-terminal power supply VR1, the capacitor C3 and the transient overvoltage suppression diode D20, and the transient overvoltage suppression diode D20 suppresses possible overvoltage of a U1 node between the non-return diode D5 and the capacitor C3.
As a specific embodiment, the correspondence relationship between the first insulating flying lead 11 and the second insulating flying lead 12 and the pins of the corona wire incoming terminal P1 satisfies the following conditions: when the high-voltage transmission line 5 is provided with a positive high voltage, the second insulating flying lead 12 is connected with a positive pin (a 1 st pin) of a corona wire incoming terminal P1, and the first insulating flying lead 11 is connected with a negative pin (a 2 nd pin) of a corona wire incoming terminal P1; when the high-voltage transmission line 5 is provided with negative polarity high voltage, the first insulating flying lead 11 is connected with the positive pin of the corona wire incoming terminal P1, and the second insulating flying lead 12 is connected with the negative pin of the corona wire incoming terminal P1; when high tension transmission line 5 takes power frequency to exchange high voltage, first insulating flying lead 11 and second insulating flying lead 12 correspond the connection wantonly with corona wire incoming terminal P1's anodal pin or negative pole pin respectively, when the anodal pin of corona wire incoming terminal P1 is connected to first insulating flying lead 11 promptly, negative pole pin is connected to second insulating flying lead 12, otherwise when the negative pole pin of corona wire incoming terminal P1 is connected to first insulating flying lead 11, anodal pin is connected to second insulating flying lead 12.
Specifically, in the above embodiment, in order to prevent the corona current of the ultrafine stainless steel corona wire 8 from exceeding the standard in any weather condition, the ultrafine stainless steel corona wire 8 is placed above the high voltage transmission line 5 and arranged in parallel with the high voltage transmission line 5, so that water droplets accumulated on the ultrafine stainless steel corona wire 8 do not seriously distort the electric field in rainy days, the corona of the ultrafine stainless steel corona wire 8 is stable and the output voltage fluctuation is small, and accidental strong corona of burst injection type does not occur, so that the wireless communication is interfered. Since the negative corona is easier than the positive corona in the same voltage amplitude of the very non-uniform electric field, when the high voltage transmission line 5 transmits the power frequency current, the first insulation flying wire 11 is connected to the 1 st pin, which is the positive pin of the corona wire inlet terminal P1, and the second insulation flying wire 12 is connected to the 2 nd pin, which is the negative pin of the corona wire inlet terminal P1, so as to shorten the length of the ultra-fine stainless steel corona wire 8 or shorten the vertical distance between the ultra-fine stainless steel corona wire 8 and the high voltage transmission line.
The invention utilizes the characteristics of extremely strong electric field on the surface of the extremely fine electrode and easy corona discharge to intercept and convert the corona current and output electric energy, and can supply power for small loads such as fault indicators, wireless sensor nodes and the like along the overhead transmission line by matching with overvoltage suppression and overcurrent protection.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a high tension power line can device of getting on spot based on corona discharge principle, its characterized in that, includes the power pack, power pack top both sides are equipped with bushing and insulator, the lower extreme gold utensil root of bushing and insulator is connected with electrically conductive installation hasp, electrically conductive installation hasp keeps insulating with bushing and insulator, electrically conductive installation hasp articulates on high tension power line and is connected with the power pack that is located high tension power line below, bushing's top is connected with first voltage-sharing ball, the top of insulator is connected with second voltage-sharing ball, be connected with the superfine stainless steel corona wire of parallel arrangement above high tension power line between first voltage-sharing ball and the second voltage-sharing ball, the inside insulating circuit board that is equipped with of power pack, be equipped with corona wire incoming terminal P1 on the insulating circuit board, energy-taking circuit on corona wire incoming terminal P1's positive pole pin connection insulating circuit board, Protection circuit and power conversion circuit back are connected with corona wire inlet terminal P1's negative pole pin, superfine stainless steel corona wire loops through inside guide arm of insulating sleeve and first insulating flying lead and corona wire inlet terminal P1's anodal pin or negative pole pin and is connected, corresponds electrically conductive installation hasp passes through the second insulating flying lead and is connected with corona wire inlet terminal P1's negative pole pin or anodal pin.
2. The corona discharge based local energy extracting device for high voltage transmission line according to claim 1, wherein said power box is made of light, conductive and rust-proof material, and the corners are chamfered.
3. An in-situ energy-taking device for high-voltage transmission lines based on corona discharge principle as claimed in claim 1, wherein said insulating sleeve and insulator have a shed structure.
4. The corona discharge based local energy extracting device for high voltage transmission line according to claim 1, wherein the radius of the first and second voltage equalizing balls is greater than or equal to the radius of the high voltage transmission line.
5. The corona discharge principle-based local energy taking device for high-voltage transmission lines according to claim 1, wherein the diameter of the ultra-fine stainless steel corona wire is 0.05-0.1 mm.
6. The corona discharge principle-based local energy taking device for the high-voltage transmission line of claim 1, wherein the positive terminal of the corona wire inlet terminal P1 is connected in series with a self-recovery fuse FU0, a fuse FU1 and a corona-induced resistor R0 in sequence, and then the wire returns to the negative terminal of the corona wire inlet terminal P1; the upper end of the corona inducing resistor R0 is connected with the anode of a non-return diode D5, the cathode of the non-return diode D5 is connected with the anode of a capacitor C3, the cathode of the capacitor C3 is connected with the cathode pin of a corona wire incoming terminal P1, the positive end and the negative end of the capacitor C3 are connected with a voltage divider sampling resistor R5 and a voltage divider sampling resistor R6 which are sequentially connected in series in parallel, and a transient overvoltage suppression diode D21 is further connected between a connection node P06 between the voltage divider sampling resistors R5 and R6 and the cathode pin of the corona wire incoming terminal P1; the upper end and the lower end of the corona inducing resistor R0 are connected with forward clamping diode groups D6-Dn in parallel, and the forward clamping diode groups D6-Dn are formed by connecting a plurality of ultrafast recovery diodes with the same model in series in sequence; the positive electrode of the capacitor C3 is connected with the input end of a three-terminal power supply VR1, the output end of the three-terminal power supply VR1 is connected with a first pin of a power supply outlet terminal P2, and a second pin of the power supply outlet terminal P2 is connected with a negative electrode pin of a corona wire inlet terminal P1; the output end of the three-terminal power supply VR1 is also sequentially connected with a charging current-limiting resistor R1, sliding switches S2 and S1, an on-board storage battery BT1 in series and connected with a voltage-stabilizing capacitor C1 in parallel, and the negative electrode of the on-board storage battery BT1 is connected with the negative electrode pin of a corona wire inlet terminal P1; a voltage stabilizing capacitor C2 and an on-board load terminal P3 are connected between the connection node P12 between the slide switches S2 and S1 and the negative terminal of the corona wire inlet terminal P1.
7. The corona discharge based local energy extracting device for high voltage transmission line according to claim 6, wherein said corona inducing resistor R0 has a single reverse diode D0 connected in parallel.
8. The corona discharge based local energy extracting device for high voltage transmission line according to claim 7, wherein said corona inducing resistor R0 has a piezoresistor R4 connected in parallel to its upper and lower ends.
9. The corona discharge based local energy extracting device for high voltage transmission line according to claim 6, wherein said capacitor C3 has overvoltage transient suppressor D20 connected in parallel between its positive and negative terminals.
10. An in-situ energy extraction apparatus for high voltage transmission lines based on corona discharge principles as claimed in claim 1 wherein said second flying insulator is connected to the positive terminal of the corona wire inlet terminal and said first flying insulator is connected to the negative terminal of the corona wire inlet terminal when said high voltage transmission line is of positive polarity high voltage; when the high-voltage transmission line is provided with negative polarity high voltage, the first insulating flying line is connected with a positive electrode pin of a corona wire incoming terminal, and the second insulating flying line is connected with a negative electrode pin of the corona wire incoming terminal; when the high-voltage power transmission line is provided with a power frequency alternating current high voltage, the first insulation flying line and the second insulation flying line are respectively and correspondingly connected with a positive electrode pin or a negative electrode pin of a corona wire incoming terminal.
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| CN116295811A (en) * | 2023-05-18 | 2023-06-23 | 华东交通大学 | Power transmission line lower bridge state detection device based on self-energy-taking RFID sensor |
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