High-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device

Abstract

The present invention relates to a high-coupling splitting reactance current-limiting multi-chamber arc-extinguishing lightning protection device, which is characterized in that it comprises a columnar body made of epoxy resin, a plurality of arc-extinguishing chambers are arranged in the body along the axial interval, the arc-extinguishing chamber is provided with a chamber arc nozzle on the body surface, and the spraying directions of the adjacent chamber arc nozzles are opposite, and two high-coupling splitting small reactances are arranged in the body between adjacent arc-extinguishing chambers along the axial direction, one end of the two high-coupling splitting small reactances are collected and fixedly connected to the chamber converging graphite electrode, and the other end is respectively fixedly connected to the chamber shunt graphite electrode, and the chamber converging graphite electrode and the chamber shunt graphite electrode are partially exposed in the arc-extinguishing chamber. The present invention can greatly reduce the lightning tripping rate and accident rate, greatly improve the reclosing success rate, and effectively reduce the impact of lightning on the power system.

Description

Technical Field

[0001] The invention belongs to the technical field of lightning protection for power transmission lines, and in particular relates to a high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device. Background Art

[0002] After striking the transmission line (overhead insulated conductor), the impulse flashover path develops into a stable power frequency short-circuit arc, which is the cause of lightning tripping and line disconnection. If the lightning impulse flashover does not develop into a stable power frequency short-circuit arc, it will not cause faults to the power system and the circuit breaker will not trip. If the lightning impulse flashover develops into a stable power frequency short-circuit arc, it will cause the circuit breaker to trip; after the power frequency short-circuit arc channel is deionized and the insulation state is restored, the line reclosing device will operate and the power supply will be restored; if the arc channel is not sufficiently deionized at this time, after the reclosing device is operated, the circuit breaker will overlap with the short-circuit arc channel that is not sufficiently deionized, causing the arc to reignite and causing reclosing failure. The effective suppression of the formation of power frequency short-circuit arcs can greatly reduce the lightning tripping rate, and the effective extinguishing of power frequency short-circuit arcs can greatly increase the success rate of circuit breaker reclosing, and greatly reduce the lightning line disconnection rate and accident rate.

[0003] The lightning protection measures currently used in power systems have the following problems: (1) Installation of lightning conductors: Without complete protection of transmission lines from shielding failure and strike-back failure, the damage to the power system caused by lightning strikes cannot be fundamentally eliminated; (2) Installation of line lightning arresters: Due to the strong skin effect of the lightning arrester valve plate in the process of discharging lightning current, the valve plate ages seriously and the incidence of thermal collapse is high, resulting in extremely limited number of arrester operations, which is prone to lightning arrester explosion accidents. In areas with large lightning currents and frequent lightning strikes, line lightning arresters become "disposable items" with high investment costs; line lightning arresters need to be regularly removed and tested, and reinstalled after passing the test, which is a huge workload and high cost; (3) Installation of parallel protection gaps: The parallel protection gap is a method of reducing the line insulation to guide the lightning strike channel and short-circuit arc to the gap. This method reduces the lightning accident rate but increases the lightning tripping rate and short-circuit arc reignition rate, increases the number of circuit breaker operations, and greatly increases the number of shocks to the power system.

[0004] Based on the technical difficulties of the endless lightning faults in power transmission lines, this patent develops a multi-chamber arc extinguishing lightning protection device based on high-coupling split reactance current limiting type, which has the function of deeply suppressing the evolution of impulse flashover to power frequency short-circuit arc; it can effectively limit the level of short-circuit arc, effectively extinguish power frequency short-circuit arc, and effectively suppress the reignition of short-circuit arc; it has achieved a significant reduction in lightning trip rate and accident rate, and a significant increase in the success rate of reclosing. It effectively reduces the impact of lightning on the power system and protects the safety of the power system under the background of frequent lightning disasters.

[0005] Therefore, based on these problems, it is of great practical significance to provide a high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device that can significantly reduce lightning tripping rate and accident rate, significantly improve the reclosing success rate, and effectively reduce the impact of lightning on the power system. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-coupling split reactance current limiting multi-chamber arc extinguishing lightning protection device that can significantly reduce the lightning tripping rate and accident rate, significantly improve the reclosing success rate, and effectively reduce the impact of lightning on the power system.

[0007] The present invention solves the technical problem by adopting the following technical solutions:

[0008] A high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device comprises a columnar body made of epoxy resin, wherein a plurality of arc-extinguishing chambers are arranged in the body along the axial direction, wherein the arc-extinguishing chambers are provided with chamber arc nozzles on the surface of the body, and the spraying directions of adjacent chamber arc nozzles are opposite, and two high-coupling split small reactances which are wound in opposite directions are arranged in the body between adjacent arc-extinguishing chambers along the axial direction, wherein one end of the two high-coupling split small reactances are converged and fixedly connected to the chamber converging graphite electrode, and the other end are respectively fixedly connected to the chamber shunt graphite electrodes, and both the chamber converging graphite electrode and the chamber shunt graphite electrode are partially exposed in the arc-extinguishing chamber.

[0009] Furthermore, it also includes a grounding electrode and a high-voltage electrode; one end of the grounding electrode is fixedly connected to a grounding electrode graphite ball, and the grounding electrode graphite ball and part of the grounding electrode are fixedly buried in one end of the main body; one end of the high-voltage electrode is fixedly connected to a high-voltage electrode graphite ball, and the high-voltage electrode graphite ball and part of the high-voltage electrode are fixedly buried in the other end of the main body, and part of the high-voltage electrode graphite ball is located in the first arc extinguishing chamber at this end of the main body.

[0010] Furthermore, the arc extinguishing chamber where the graphite ball portion of the high-voltage electrode is located is a chamber that exposes a portion of the chamber converging graphite electrode.

[0011] Furthermore, a composite jacket insulating shed is fixedly provided on the outer side of the body between adjacent arc extinguishing chambers.

[0012] Furthermore, the other end of the grounding electrode is fixed to the connecting fitting between the insulator string and the tower cross arm through the first fixing device, and the insulator string is connected to the cross arm through the connecting fitting.

[0013] Furthermore, the other end of the high-voltage electrode is fixed to the connecting fitting between the insulator string and the high-voltage conductor through a second fixing device.

[0014] Furthermore, the distance between the ground electrode graphite ball 4 and the high voltage electrode graphite ball 8 is 80-90% of the height of the insulator string.

[0015] Furthermore, the chamber arc nozzle is a trumpet-shaped nozzle.

[0016] The advantages and positive effects of the present invention are:

[0017] The multi-chamber arc-extinguishing lightning protection device based on the high-coupling split reactance current limiting type of the present invention has the function of deeply suppressing the evolution of impulse flashover to power frequency short-circuit arc; it can effectively limit the level of short-circuit arc, effectively extinguish power frequency short-circuit arc, and effectively suppress the reignition of short-circuit arc; it achieves a significant reduction in lightning tripping rate and accident rate, and a significant increase in the reclosing success rate, effectively reducing the impact of lightning strikes on the power system, and protecting the safety of the power system under the background of frequent lightning disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0019] Figure 1 It is a structural schematic diagram of the installation and use of the high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device provided in an embodiment of the present invention;

[0020] Figure 2 It is a partial longitudinal axial cross-sectional view of the body of the high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device provided in an embodiment of the present invention; DETAILED DESCRIPTION

[0021] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict.

[0023] The following is combined Figure 1-2 The present invention will be described in detail.

[0024] The high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device provided in the present embodiment comprises a columnar body 7 made of epoxy resin, wherein a plurality of arc-extinguishing chambers 19 are arranged in the body 7 at intervals along the axial direction, wherein the arc-extinguishing chambers 19 are provided with chamber arc nozzles 5 on the surface of the body 7, and the spraying directions of adjacent chamber arc nozzles 5 are opposite, and two high-coupling split small reactances 14 wound in opposite directions are arranged in the body between adjacent arc-extinguishing chambers 19 along the axial direction, wherein one end of the two high-coupling split small reactances 14 converge and are fixedly connected to the chamber converging graphite electrode 6, and the other end are fixedly connected to the chamber shunt graphite electrodes 18 respectively, and both the chamber converging graphite electrode 6 and the chamber shunt graphite electrode 18 are partially exposed in the arc-extinguishing chamber 19.

[0025] It also includes a grounding electrode 3 and a high-voltage electrode 9; one end of the grounding electrode 3 is fixedly connected to the grounding electrode graphite ball 4, and the grounding electrode graphite ball 4 and part of the grounding electrode 3 are fixedly buried in one end of the main body 7; one end of the high-voltage electrode 9 is fixedly connected to the high-voltage electrode graphite ball 8, and the high-voltage electrode graphite ball 8 and part of the high-voltage electrode 9 are fixedly buried in the other end of the main body 7, and part of the high-voltage electrode graphite ball 8 is located in the first arc extinguishing chamber 19 at this end of the main body. It should be noted that the arc extinguishing chamber 19 where part of the high-voltage electrode graphite ball 8 is located is a chamber that exposes part of the chamber converging graphite electrode 6.

[0026] A composite jacket insulating shed 16 is fixedly provided on the outer side of the body between adjacent arc extinguishing chambers 19 .

[0027] The other end of the grounding electrode 3 is fixed to the connection fitting between the insulator string 1 and the tower crossarm through the first fixing device 12, and the insulator string is connected to the crossarm through the connecting fitting; the other end of the high-voltage electrode 9 is fixed to the connection fitting between the insulator string and the high-voltage conductor 10 through the second fixing device 13; it should be pointed out that the first fixing device 12 and the second fixing device 13 can adopt conventional fixing structures, as long as the fixing function is achieved, without being restricted to a specific structure.

[0028] In addition, it should be considered that the distance between the ground electrode graphite ball 4 and the high voltage electrode graphite ball 8 is 80-90% of the height of the insulator string.

[0029] As an example, in the present embodiment, the chamber converging graphite electrode 6 has the function of converging arc current, and the chamber diverting graphite electrode 18 has the function of diverting arc current. The chamber converging graphite electrode 6 collects arc current, and after passing through the high-coupling splitting small reactance 14, it is transmitted to the chamber diverting graphite electrode 18 for diversion, and then the hot arc plasma is ejected outward at the chamber arc nozzle 5, and the nozzle directions of the two adjacent chamber arc nozzles 5 are opposite. Such a design can make the arc current unevenly distributed in the arc extinguishing chamber 19 after the arc is ejected, so that the high-coupling splitting small reactance 14 plays a current limiting role, thereby greatly reducing the arc current and accelerating the arc extinction. In addition, it can be considered to set a trumpet-shaped nozzle at the chamber arc nozzle 5. The nozzle is designed into such a structure to utilize the self-expansion effect of arc plasma to accelerate the injection and improve the arc extinguishing ability.

[0030] The transmission line parallel gap protection technology is the basis of the invented device. By partially short-circuiting the insulator string, the discharge voltage of the gap is lower than that of the insulator string. When a lightning strike occurs at the insulator string, the discharge voltage of the gap is lower than that of the insulator string, so the discharge occurs at the gap, thereby keeping the discharge arc away from the insulator string, preventing the insulator string from being burned by the arc and exploding, causing severe situations such as line breakage.

[0031] In the patented device, when a lightning overvoltage occurs at the insulator string, discharge occurs at the patented device. Since the high-coupling shunt reactor is reversely wound, the transmission of the lightning overvoltage wave here is equivalent to a short circuit, which avoids insulation breakdown under the action of the lightning impulse overvoltage caused by the choking action of the reactor at the shunt reactor. At this time, the reversely wound coil structure provides a zero-damping transmission channel for the lightning overvoltage wave, and the lightning overvoltage wave smoothly enters the ground through the tower. After the lightning overvoltage, whether a stable burning power frequency arc is triggered inside the device is the cause of the lightning tripping of the transmission line. In the device of the present patent, the effective chamber converging graphite electrode 6 has the function of collecting arc current, and the chamber shunting graphite electrode 18 has the function of shunting arc current. The chamber converging graphite electrode 6 collects the arc current, and after passing through the high-coupling splitting small inductor 14, it is transmitted to the chamber shunting graphite electrode 18 for shunting. Then the hot arc plasma is ejected outward at the chamber arc nozzle 5. The nozzle directions of the two adjacent chamber arc nozzles 5 are opposite. Such a design can make the arc current unevenly distributed in the arc extinguishing chamber 19 after the arc is ejected, so that the high-coupling splitting small inductor 14 plays a current limiting role, thereby greatly reducing the arc current and accelerating the arc extinction. In addition, it can be considered to set a trumpet-shaped nozzle at the chamber arc nozzle 5. The structure designed at the nozzle is to utilize the self-expansion of the arc plasma to accelerate the ejection and improve the arc extinguishing ability.

[0032] The high-coupling split reactance current-limiting multi-chamber arc-extinguishing lightning protection device of the present invention realizes deep suppression of the evolution of impulse flashover to power frequency short-circuit arc; can effectively limit the level of short-circuit arc, effectively extinguish power frequency short-circuit arc, and effectively suppress the reignition of short-circuit arc; realizes a significant reduction in lightning tripping rate and accident rate, and a significant improvement in the reclosing success rate; effectively reduces the impact of lightning strikes on the power system, and protects the safety of the power system under the background of frequent lightning disasters; and the device has a simple manufacturing process, strong operability, low cost, simple installation method, quick use, strong operability, low construction intensity, and is suitable for large-scale promotion and use.

[0033] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. High-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device, characterized in that: It comprises a columnar body made of epoxy resin, wherein a plurality of arc extinguishing chambers are arranged in the body along the axial direction, wherein the arc extinguishing chambers are provided with chamber arc nozzles on the surface of the body, and the spraying directions of adjacent chamber arc nozzles are opposite, and two high-coupling splitting small reactances which are wound in opposite directions are arranged in the body between adjacent arc extinguishing chambers along the axial direction, wherein one end of the two high-coupling splitting small reactances are converged and fixedly connected to the chamber converging graphite electrode, and the other end are respectively fixedly connected to the chamber shunt graphite electrode, and both the chamber converging graphite electrode and the chamber shunt graphite electrode are partially exposed in the arc extinguishing chamber.

2. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 1 is characterized in that: It also includes a grounding electrode and a high-voltage electrode; one end of the grounding electrode is fixedly connected to a grounding electrode graphite ball, and the grounding electrode graphite ball and part of the grounding electrode are fixedly buried in one end of the main body; one end of the high-voltage electrode is fixedly connected to a high-voltage electrode graphite ball, and the high-voltage electrode graphite ball and part of the high-voltage electrode are fixedly buried in the other end of the main body, and part of the high-voltage electrode graphite ball is located in the first arc extinguishing chamber at this end of the main body.

3. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 2 is characterized in that: The arc extinguishing chamber where the graphite ball part of the high-voltage electrode is located is a chamber in which a part of the chamber converges the graphite electrode.

4. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 1 is characterized in that: A composite jacket insulating shed is fixedly provided on the outer side of the body between adjacent arc extinguishing chambers.

5. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 2 or 3 is characterized in that: The other end of the grounding electrode is fixed to the connection fitting between the insulator string and the tower cross arm through a first fixing device.

6. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 5 is characterized in that: The other end of the high-voltage electrode is fixed to the connecting fitting between the insulator string and the high-voltage conductor through a second fixing device.

7. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 6 is characterized in that: The distance between the grounding electrode graphite ball and the high-voltage electrode graphite ball is 80-90% of the height of the insulator string.

8. The high-coupling split-reactor current-limiting multi-chamber arc-extinguishing lightning protection device according to claim 1 is characterized in that: The chamber arc nozzle is a trumpet-shaped nozzle.

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