A local energy harvesting device based on corona discharge of high voltage overhead lines

Abstract

The present invention provides an on-site energy-collecting device based on corona discharge of a high-voltage overhead line, comprising an insulating plate, stainless steel wire ring brackets are provided on the left and right sides of the lower end of the insulating plate, an extremely fine stainless steel wire ring is sleeved on the stainless steel wire ring bracket, an insulating box is fixed on the side of the insulating plate above the stainless steel wire ring, a power conversion module for processing the current flowing when the steel wire on the lower side of the stainless steel wire ring is corona discharged and outputting a stable micro-power source is provided in the insulating box, a tension spring connected to the lower input terminal of the power conversion module is hooked at the center of the upper side of the stainless steel wire ring, a stainless steel spring sheet longer than the stainless steel wire ring is fixed on the upper end of the insulating plate, a clamping groove is provided on the inner surface of the stainless steel spring sheet and the lower end protrudes toward the outer side of the insulating plate, a conductive terminal is fixed on the inner side of the upper end of the stainless steel spring sheet, a wire extending downward is connected to the conductive terminal, and the lower end of the wire is connected to the input terminal on the power conversion module. The present application realizes on-site energy collection by utilizing the characteristic that corona discharge is easy to occur in high-voltage lines.

Description

Technical Field

[0001] The invention relates to the technical field of local energy acquisition of high-voltage overhead lines, and in particular to a local energy acquisition device based on corona discharge of high-voltage overhead lines. Background Art

[0002] High-voltage transmission lines are channels for the transmission of electric energy, especially overhead transmission lines. Due to the long lines, the huge number of insulators used, and the great differences in geological, climatic and meteorological conditions along the high-voltage lines, there is a high probability of single-phase grounding, multi-phase short-circuit grounding, wire fusing and other faults in the transmission lines. For automatically recoverable faults, automatic or manual reclosing can be used. However, when an unrecoverable fault occurs, it is necessary to respond quickly, analyze the fault recording waveform, estimate and locate the fault point, and then find and repair the fault on site to minimize the line outage time and reduce the power outage loss.

[0003] Obviously, conventional line differential protection can indicate the fault line, but cannot give the specific fault section. Although fault recording can calculate the fault point based on the analysis of the line fault waveform, the line load type, quantity, distribution location, fault type and many other situations are different, and it is also difficult to locate and analyze the fault point. Generally, once a line has a fault that cannot be automatically restored, the line patrol personnel are required to check the fault along the line in turn. Since there is no specific target for line patrol, the efficiency is low, the labor intensity is high, it often takes a long time, and the power outage loss is large. For this reason, line fault intelligent indication devices have been developed at home and abroad. Generally, a device is configured at a certain distance along the transmission line to monitor the current flowing in each section of the line, and radio frequency wireless communication or optical fiber technology is used for networking communication and data exchange. The data is comprehensively analyzed to roughly locate the fault point. Therefore, the line fault intelligent indication device can greatly improve the accuracy and timeliness of fault identification and fault location.

[0004] However, each line fault intelligent indication device needs to use a power supply to complete data collection, preliminary analysis, networking communication and other tasks. The existing line fault intelligent indication device is often powered by the following methods: battery, or a combination of battery and photovoltaic panel, micro wind power, current transformer and the like. Voltage transformers are generally not used because of their high cost and difficult maintenance. The inventor of the present invention has found through research that battery power supply is not realistic due to the long line and the large number of detection points. The combination of battery and photovoltaic panel can provide long-term working power, but the photovoltaic panel is slightly worse at night, especially on long rainy days in winter, the energy provided by the photovoltaic panel is extremely limited. The actual operation of the line fault intelligent indication device shows that even if the battery capacity is large, the electric energy stored in the battery has been exhausted before the end of winter. The reason is that the battery itself has a certain self-discharge characteristic, and the electric energy may disappear quickly even if it is unloaded after charging. Micro wind power is large in size and is not convenient to install on high-voltage transmission lines, and its own instability may also cause a power supply gap for the line fault intelligent indication device.

[0005] The combined structure of the battery and the current transformer adopts the mutual inductance principle of the transformer. A large current flows into a single turn of the primary side of the current transformer, and a low-voltage small current is output on the secondary side. After conversion and storage, it provides a reliable driving power supply for the line fault intelligent indication device. However, the current in the transmission line changes with the size of the power load and also has a certain instability, which increases the risk of power supply gaps and the difficulty of power supply development. Moreover, the current transformer operates in the power frequency range, requiring the core and winding to be of large quality, thereby increasing the manufacturing cost. Especially for high-voltage lines, due to the high voltage level and the high distance between the transmission line and the ground, it is difficult to install.

[0006] For the current transformer type local power supply that adopts the transformer mutual inductance principle, its significant disadvantage is that when the load current on the line is less than a certain value, the secondary output amplitude of the current transformer will become very low and cannot effectively output electric energy. Therefore, it is urgent to solve this problem. Summary of the invention

[0007] In view of the technical problems existing in the existing local energy acquisition method of high-voltage overhead lines, the present invention provides a local energy acquisition device based on corona discharge of high-voltage overhead lines.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A local energy-taking device based on corona discharge of a high-voltage overhead line comprises an insulating plate, stainless steel wire ring brackets are provided on the left and right sides of the lower end of the insulating plate, an extremely fine stainless steel wire ring is sleeved on the stainless steel wire ring bracket, an insulating box is fixedly connected to the surface of the insulating plate above the stainless steel wire ring, a power conversion module for processing the current flowing during corona discharge of the steel wire at the lower part of the stainless steel wire ring and finally outputting a stable micro power supply is arranged in the insulating box, a tension spring for tightening and straightening the stainless steel wire ring is hooked at the center of the upper side of the stainless steel wire ring, the upper end of the tension spring is connected to the lower input terminal of the power conversion module, a stainless steel spring sheet longer than the stainless steel wire ring is fixedly connected to the upper end of the insulating plate, a clamping groove is provided on the inner surface of the stainless steel spring sheet for facilitating the whole device to be hung on the overhead transmission line, the lower end of the stainless steel spring sheet protrudes outwardly toward the side away from the surface of the insulating plate, a conductive terminal is fixedly inserted on the inner side of the upper end of the stainless steel spring sheet, a wire extending downward is connected to the conductive terminal, and the lower end of the wire is connected to the upper input terminal of the power conversion module.

[0010] Compared with the prior art, the local energy acquisition device based on corona discharge of high-voltage overhead lines provided by the present invention utilizes the characteristics that the operating voltage of the high-voltage line is high and corona discharge is easy to occur at the protruding tip of the high-voltage conductor, and designs the local energy acquisition device based on corona discharge. Corona discharge often occurs at the protruding tip of the high-voltage conductor, that is, the electrode required to generate corona is small, small in mass, light, and low in cost. The voltage amplitude and effective value of the transmission line remain unchanged, so that the primary electric energy obtained by the device is highly stable, and does not need to be replaced like a battery, nor is it unstable like photovoltaic and micro wind power. It is not restricted by the user load size, that is, the AC current size of the line like a current transformer type local energy acquisition device, and does not require a super-large area capacitor plate like a distributed capacitance local energy acquisition device under AC.

[0011] It should be pointed out that the present invention does not use the distributed capacitance voltage division method between the high-voltage line and the earth to obtain power. Therefore, the present invention adopts the principle of attaching extremely fine stainless steel wire to the high-voltage line and easily corona discharge to intercept and transform electric energy. It can not only intercept electric energy on the AC power line, but also intercept electric energy on the DC power line. There is no requirement for the line voltage polarity and whether it is alternating. Moreover, the local energy acquisition device based on the corona discharge of the high-voltage overhead line of the present invention overcomes the deficiency that the current transformer type local power supply cannot effectively output electric energy when the line current is small, and improves the power supply reliability. Therefore, the local energy acquisition device based on the corona discharge of the high-voltage overhead line provided by the present invention is more stable, lightweight and low-cost.

[0012] Furthermore, the insulating board has an umbrella-shaped appearance, and the umbrella-shaped insulating board includes a glass fiber core and insulating silicone rubber cast on the surface of the glass fiber core.

[0013] Furthermore, the diameter of the stainless steel wire ring is 0.1-0.2 mm.

[0014] Furthermore, the upper end of the stainless steel spring sheet and the insulation box are fixedly mounted on the insulation plate by fixing screws.

[0015] Further, the power conversion module includes a ball gap Gap, a varistor R1, a bidirectional overvoltage suppressor D0 and a corona inducing resistor R0, both ends of which are respectively connected to the upper input terminal and the lower input terminal, the upper input terminal is also connected to the positive electrode of the ultra-fast recovery diode D1 and the negative electrode of the ultra-fast recovery diode D3, the lower input terminal is also connected to the positive electrode of the ultra-fast recovery diode D2 and the negative electrode of the ultra-fast recovery diode D4, the negative electrodes of the ultra-fast recovery diodes D1 and D2 are connected to the positive electrode of the primary side of the pulse transformer through the current limiting resistor R2 and the negative resistance resistor R3, the positive electrodes of the ultra-fast recovery diodes D3 and D4 are connected to the negative electrode of the primary side of the pulse transformer, the negative electrode of the ultra-fast recovery diodes D2 and D4 are connected A capacitor C1 is connected between the positive electrodes of the ultra-fast recovery diode D4, a capacitor C2 is connected to the node between the positive electrode of the ultra-fast recovery diode D4 and the current limiting resistor R2 and the negative resistance resistor R3, the secondary positive electrode of the pulse transformer is connected to the positive electrode of the fast recovery diode D6 and the negative electrode of the fast recovery diode D8, the secondary negative electrode of the pulse transformer is connected to the positive electrode of the fast recovery diode D5 and the negative electrode of the fast recovery diode D7, the negative electrodes of the fast recovery diodes D5 and D6 are connected as the output positive terminal of the power conversion module, the positive electrodes of the fast recovery diodes D7 and D8 are grounded as the output negative terminal of the power conversion module, and a capacitor C3 and a voltage regulator diode D9 are respectively connected between the output positive terminal and the output negative terminal.

[0016] Furthermore, the ball gap Gap is a neon gap.

[0017] Furthermore, the resistance value of the corona inducing resistor R0 is greater than 10G ohms.

[0018] Furthermore, the optional action value of the varistor R1 is much larger than the action value of the negative resistance resistor R3, the action value of the bidirectional overvoltage suppressor D0 is slightly lower than the action value of the varistor R1, and the breakdown voltage of the ball gap Gap is slightly larger than the action value of the varistor R1.

[0019] Furthermore, the ultrafast recovery diodes D1-D4 are 2Ap9 type detection diodes, and the fast recovery diodes D5-D8 are IN4148 or HER208 type high-speed switching diodes.

[0020] Furthermore, the negative resistance resistor R3 is a DB3, DB4 or DB5 type bidirectional trigger diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an on-site energy collection device based on high-voltage overhead line corona discharge provided by the present invention.

[0022] Figure 2 It is a schematic diagram of the principle of a power conversion module in an on-site energy acquisition device based on corona discharge of a high-voltage overhead line provided by the present invention.

[0023] In the figure, 1. insulation board; 2. stainless steel wire ring bracket; 3. stainless steel wire ring; 4. insulation box; 5. tension spring; 6. stainless steel spring sheet; 61. snap-in groove; 7. overhead power transmission line; 8. conductive terminal; 9. wire; 10. fixing screw. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0025] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Please refer to Figure 1As shown, the present invention provides an on-site energy-collecting device based on corona discharge of a high-voltage overhead line, comprising an insulating plate 1, wherein the insulating plate 1 is mainly used for the installation and fixation of electrical components, and stainless steel wire ring brackets 2 are provided on the left and right sides of the lower end of the insulating plate 1, and an extremely fine stainless steel wire ring 3 is sleeved on the stainless steel wire ring bracket 2, and an insulating box 4 is fixedly connected to the surface of the insulating plate 1 above the stainless steel wire ring 3, and a power conversion module is provided in the insulating box 4 for processing the flowing current of the steel wire at the lower side of the stainless steel wire ring 3 during corona discharge and finally outputting a stable micro power supply, and the power conversion module specifically processes the flowing current of the steel wire at the lower side of the stainless steel wire ring 3 during corona discharge. The circulating current is subjected to overvoltage suppression, current cutting, reverse blocking, filtering, damping, inversion, isolation, high-frequency rectification, filtering, voltage stabilization and other measures in sequence, and finally a stable low-power power supply is output. The power conversion module is sealed in an insulating box 4 to prevent corrosion by rainwater. The upper center of the stainless steel wire ring 3 is hooked with a tension spring 5 for tightening and straightening the stainless steel wire ring 3, that is, the lower end of the tension spring 5 is hooked, hooking the upper center of the stainless steel wire ring 3, so that the steel wire of the lower part of the stainless steel wire ring 3 is tightened and straightened, and the upper end of the tension spring 5 is connected to the lower input terminal y of the power conversion module. The tension spring 5 can be made of stainless steel. After installation and connection, The pulling force is tens or hundreds of grams, which can be determined according to the diameter and tensile strength of the ultra-fine stainless steel wire ring 3, so as to ensure that the stainless steel wire ring 3 is tensioned and straightened. The upper end of the insulating plate 1 is fixedly connected with a stainless steel spring sheet 6 which is slightly longer than the stainless steel wire ring 3. The inner surface of the stainless steel spring sheet 6 is provided with a snap-in groove 61 which is convenient for hanging the entire device on the overhead power transmission line 7. That is, through the snap-in cooperation between the overhead power transmission line 7 and the snap-in groove 61, the device can be fixedly hung on the overhead power transmission line 7. The lower end of the stainless steel spring sheet 6 protrudes outward toward the side away from the surface of the insulating plate 1, that is, the lower end of the stainless steel spring sheet 6 is inclined toward the outside of the insulating plate 1. The oblique bend can, to a certain extent, prevent rainwater from dripping directly onto the stainless steel wire ring 3 directly below, reduce rainwater erosion, and reduce the influence of rainwater on the corona discharge intensity on the lower side of the stainless steel wire ring 3. A conductive terminal 8 is fixedly inserted into the inner side of the upper end of the stainless steel spring sheet 6, and a wire 9 extending downward is connected to the conductive terminal 8. The lower end of the wire 9 is connected to the upper input terminal x of the power conversion module. Therefore, the upper end of the stainless steel spring sheet 6 is fixedly connected to the insulating plate 1. After installation, the high-voltage charge on the overhead transmission line 7 can be directly led to the upper input terminal x of the power conversion module along the conductive terminal 8 and the wire 9 in sequence.

[0028] Compared with the prior art, the local energy acquisition device based on corona discharge of high-voltage overhead lines provided by the present invention utilizes the characteristics that the operating voltage of the high-voltage line is high and corona discharge is easy to occur at the protruding tip of the high-voltage conductor, and designs the local energy acquisition device based on corona discharge. Corona discharge often occurs at the protruding tip of the high-voltage conductor, that is, the electrode required to generate corona is small, small in mass, light, and low in cost. The voltage amplitude and effective value of the transmission line remain unchanged, so that the primary electric energy obtained by the device is highly stable, and does not need to be replaced like a battery, nor is it unstable like photovoltaic and micro wind power. It is not restricted by the user load size, that is, the AC current size of the line like a current transformer type local energy acquisition device, and does not require a super-large area capacitor plate like a distributed capacitance local energy acquisition device under AC.

[0029] It should be pointed out that the present invention does not use the distributed capacitance voltage division method between the high-voltage line and the earth to obtain power. Therefore, the present invention adopts the principle of attaching extremely fine stainless steel wire to the high-voltage line and easily corona discharge to intercept and transform electric energy. It can not only intercept electric energy on the AC power line, but also intercept electric energy on the DC power line. There is no requirement for the line voltage polarity and whether it is alternating. Moreover, the local energy acquisition device based on the corona discharge of the high-voltage overhead line of the present invention overcomes the deficiency that the current transformer type local power supply cannot effectively output electric energy when the line current is small, and improves the power supply reliability. Therefore, the local energy acquisition device based on the corona discharge of the high-voltage overhead line provided by the present invention is more stable, lightweight and low-cost.

[0030] As a specific embodiment, the insulating board 1 is in the shape of an umbrella skirt, and the umbrella skirt-shaped insulating board includes a glass fiber core and insulating silicone rubber cast on the surface of the glass fiber core. The use of the umbrella skirt-shaped insulating board 1 can better shield the stainless steel wire ring 3 and reduce the aging of the stainless steel wire ring 3 caused by the erosion of rainwater.

[0031] As a specific embodiment, the diameter of the stainless steel wire ring 3 is 0.1-0.2 mm, thereby ensuring that the extremely fine stainless steel wire has sufficient corona discharge under any weather conditions.

[0032] As a specific example, please refer to Figure 1 As shown, the upper end of the stainless steel spring sheet 6 and the insulating box 4 are fixedly mounted on the insulating plate 1 by fixing screws 10, thereby achieving a fixed connection between the stainless steel spring sheet 6 and the insulating box 4 and the insulating plate 1.

[0033] As a specific example, please refer to Figure 1As shown, the power conversion module includes a ball gap Gap, a varistor R1, a bidirectional overvoltage suppressor D0 and a corona inducing resistor R0, each of which has two ends connected to an upper input terminal x and a lower input terminal y, respectively. The upper input terminal x is also connected to the positive electrode of an ultra-fast recovery diode D1 and the negative electrode of an ultra-fast recovery diode D3, and the lower input terminal y is also connected to the positive electrode of an ultra-fast recovery diode D2 and the negative electrode of an ultra-fast recovery diode D4. The negative electrodes of the ultra-fast recovery diodes D1 and D2 are connected to the positive electrode of the primary side of a pulse transformer T through a current limiting resistor R2 and a negative resistance resistor R3. The positive electrodes of the ultra-fast recovery diodes D3 and D4 are connected to the negative electrode of the primary side of the pulse transformer T, and the negative electrode of the ultra-fast recovery diode D2 is connected to the negative electrode of the primary side of the pulse transformer T. 4 is connected with a capacitor C1, the positive electrode of the ultra-fast recovery diode D4 is connected to the node between the current limiting resistor R2 and the negative resistance resistor R3, the secondary positive electrode of the pulse transformer T is connected to the positive electrode of the fast recovery diode D6 and the negative electrode of the fast recovery diode D8, the secondary negative electrode of the pulse transformer T is connected to the positive electrode of the fast recovery diode D5 and the negative electrode of the fast recovery diode D7, the negative electrodes of the fast recovery diodes D5 and D6 are connected as the output positive terminal of the power conversion module, the positive electrodes of the fast recovery diodes D7 and D8 are grounded as the output negative terminal of the power conversion module, and the capacitor C3 and the voltage regulator diode D9 are respectively connected between the output positive terminal and the output negative terminal. The working principle of the power conversion module provided in this embodiment is as follows:

[0034] When the line is closed, the overhead high-voltage transmission wire on the line carries high-voltage charges, which are introduced into the upper input terminal x of the power conversion module through the stainless steel spring sheet 6, the conductive terminal 8 and the wire 9 in turn, and then pass through the corona inducing resistor R0 of the power conversion module and the stainless steel tension spring 5 in turn to reach the stainless steel wire ring 3; on the one hand, the stainless steel wire ring 3 is surrounded by the atmosphere, and the gas molecules in the atmosphere are due to cosmic radiation, the decay of radioactive elements on the earth's surface or in the atmosphere, and the recombination of other charged gas molecules. The free charges near the stainless steel wire ring 3 will continue to be generated and regenerated. On the other hand, the ultra-fine stainless steel wire ring 3 is arranged in the radial direction of the overhead high-voltage transmission line, and is connected to the overhead high-voltage line through the stainless steel tension spring 5, the corona-inducing resistor R0, etc. The ultra-fine stainless steel wire 3 and the stainless steel tension spring 5 are in an extremely uneven electric field. Since the diameter of the stainless steel wire ring 3 is extremely fine, the electric field strength on its surface is extremely high, and the free charges near the stainless steel wire ring 3 are attracted or repelled by a large force, so that the charges in the stainless steel wire ring 3 are neutralized with part of the free charges in the nearby atmosphere, forming a current path, thereby inevitably generating a voltage drop at both ends of the corona-inducing resistor R0;

[0035] The voltage difference across the corona inducing resistor R0 is suppressed by the gap Gap, the varistor R1, the bidirectional overvoltage suppressor D0, etc., and then passes through the ultra-fast recovery diodes D1~D4 high-frequency rectification and reverse resistance, the capacitor C1 feedforward filtering, R2 current limiting, C2 energy storage, and then through the resistor R3 with negative resistance characteristics for inversion, the pulse transformer T isolation, the fast recovery diodes D5~D8 secondary rectification, the capacitor C3 secondary filtering and the voltage stabilizing diode D9 secondary voltage, and finally outputs a stable micro power supply U0, thereby realizing the conversion processing of the circulating current when the lower part of the stainless steel wire ring 3 is corona discharged.

[0036] As a specific embodiment, the ball gap Gap adopts a neon gap, that is, the glass bulb is filled with neon gas, and the distance between the spherical surfaces of the two metal ball electrodes is as close as tens of microns, thereby ensuring stable operation during overvoltage and ensuring that other low-voltage devices are not damaged by overvoltage.

[0037] As a specific embodiment, the resistance value of the corona inducing resistor R0 is greater than 10G ohms, and the heat capacity is sufficient, so that a reliable corona current path can be established.

[0038] As a specific embodiment, the optional action value of the varistor R1 is much larger than the action value of the negative resistance resistor R3, the action value of the bidirectional overvoltage suppressor D0 is slightly lower than the action value of the varistor R1, and the breakdown voltage of the ball gap Gap is slightly larger than the action value of the varistor R1, thereby providing better protection for the ultrafast recovery diodes D1 to D4.

[0039] As a specific embodiment, the ultra-fast recovery diodes D1~D4 are selected from 2Ap9 type detection diodes, so as to better adapt to the high frequency of corona discharge; the fast recovery diodes D5~D8 are selected from IN4148 or HER208 type high-speed switching diodes, which can form a good match with the oscillation frequency of the oscillation circuit composed of capacitor C2 and negative resistance resistor R3.

[0040] As a specific embodiment, the negative resistance resistor R3 adopts a DB3, DB4 or DB5 type bidirectional trigger diode, so that when the current limiting resistor R2 charges the capacitor C2 to the action value of the negative resistance resistor R3, the impedance of the negative resistance resistor R3 is suddenly reduced to a short-circuit state close to 0, so that the capacitor C2 discharges to the primary side of the pulse transformer; when the charge in the capacitor C2 is released, if the current limiting resistor R2 takes an appropriate value, due to the current limiting effect of the current limiting resistor R2, the voltage across the capacitor C2 is still low and the current is small, and the negative resistance resistor R3 can quickly restore the forward blocking performance, thereby completing the inverter action; and the negative resistance resistor R3 can also be replaced by other more complex fully controlled power electronic switching devices.

[0041] As a specific embodiment, the feedforward filter capacitor C1 can be selected to have a withstand voltage value greater than twice the action value of the bidirectional overvoltage suppressor D0; the current limiting resistor R2 takes an appropriate value, and the resistance value cannot be too large, so as to ensure that the time constant of the capacitor C2 charging is not too large, and not too small, so as to ensure that the simple oscillation circuit composed of the capacitor C2 and the negative resistance resistor R3 can oscillate stably, and the specific parameters can be determined according to the resistance characteristics and capacitance; if the capacity of the local power supply is large, other power electronic switches can be used for current conversion; the pulse transformer T is isolated and should be able to provide a withstand voltage not lower than that of the feedforward filter capacitors C1 and C2; the withstand voltage parameters of components such as the secondary filter capacitor C3 and the secondary voltage regulator diode D9 should depend on the voltage of the final output voltage regulator source.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A local energy harvesting device based on corona discharge of high-voltage overhead lines, characterized in that: It comprises an insulating plate, and stainless steel wire ring brackets are provided on the left and right sides of the lower end of the insulating plate, and an extremely fine stainless steel wire ring with a diameter of 0.1 to 0.2 mm is sleeved on the stainless steel wire ring bracket. An insulating box is fixedly connected to the surface of the insulating plate above the stainless steel wire ring, and a power conversion module for processing the current flowing during corona discharge of the steel wire at the lower part of the stainless steel wire ring and finally outputting a stable micro power supply is arranged in the insulating box. A tension spring for tightening and straightening the stainless steel wire ring is hooked at the center of the upper side of the stainless steel wire ring, and the upper end of the tension spring is connected to the lower input terminal of the power conversion module. A stainless steel spring sheet longer than the stainless steel wire ring is fixedly connected to the upper end of the insulating plate, and a clamping groove is provided on the inner surface of the stainless steel spring sheet for facilitating the whole device to be hung on the overhead transmission line. The lower end of the stainless steel spring sheet protrudes outward toward the side away from the surface of the insulating plate, and a conductive terminal is fixedly inserted on the inner side of the upper end of the stainless steel spring sheet, and a wire extending downward is connected to the conductive terminal, and the lower end of the wire is connected to the upper input terminal of the power conversion module; The power conversion module includes a ball gap Gap, a varistor R1, a bidirectional overvoltage suppressor D0 and a corona inducing resistor R0, both ends of which are respectively connected to the upper input terminal and the lower input terminal. The upper input terminal is also connected to the positive electrode of the ultra-fast recovery diode D1 and the negative electrode of the ultra-fast recovery diode D3. The lower input terminal is also connected to the positive electrode of the ultra-fast recovery diode D2 and the negative electrode of the ultra-fast recovery diode D4. The negative electrodes of the ultra-fast recovery diodes D1 and D2 are connected to the positive electrode of the primary side of the pulse transformer through the current limiting resistor R2 and the negative resistance resistor R3. The positive electrodes of the ultra-fast recovery diodes D3 and D4 are connected to the negative electrode of the primary side of the pulse transformer. The negative electrode of the ultra-fast recovery diodes D2 and D4 are connected to the positive electrode of the primary side of the pulse transformer. A capacitor C1 is connected between the electrodes, a capacitor C2 is connected to the node between the positive electrode of the ultra-fast recovery diode D4 and the current limiting resistor R2 and the negative resistance resistor R3, the secondary positive electrode of the pulse transformer is connected to the positive electrode of the fast recovery diode D6 and the negative electrode of the fast recovery diode D8, the secondary negative electrode of the pulse transformer is connected to the positive electrode of the fast recovery diode D5 and the negative electrode of the fast recovery diode D7, the negative electrodes of the fast recovery diodes D5 and D6 are connected as the output positive terminal of the power conversion module, the positive electrodes of the fast recovery diodes D7 and D8 are grounded as the output negative terminal of the power conversion module, and a capacitor C3 and a voltage regulator diode D9 are respectively connected between the output positive terminal and the output negative terminal.

2. The local energy collection device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The insulating board has an umbrella-shaped appearance, and the umbrella-shaped insulating board comprises a glass fiber core and insulating silicone rubber cast on the surface of the glass fiber core.

3. The local energy extraction device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The upper end of the stainless steel spring sheet and the insulation box are both fixedly mounted on the insulation plate by fixing screws.

4. The local energy harvesting device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The ball gap Gap is a neon gap.

5. The local energy harvesting device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The resistance value of the corona inducing resistor R0 is greater than 10G ohms.

6. The local energy harvesting device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The optional action value of the varistor R1 is much larger than the action value of the negative resistance resistor R3, the action value of the bidirectional overvoltage suppressor D0 is slightly lower than the action value of the varistor R1, and the breakdown voltage of the ball gap Gap is slightly larger than the action value of the varistor R1.

7. The local energy harvesting device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The ultrafast recovery diodes D1-D4 are 2Ap9 detection diodes, and the fast recovery diodes D5-D8 are IN4148 or HER208 high-speed switching diodes.

8. The local energy harvesting device based on corona discharge of high-voltage overhead lines according to claim 1 is characterized in that: The negative resistance resistor R3 is a DB3, DB4 or DB5 type bidirectional trigger diode.

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