A spiral series multi-chamber parallel gap device

Abstract

The present invention discloses a multi-chamber parallel gap device using spiral series connection, which is connected in parallel to one side of an insulator string, and is composed of an arc extinguishing arm and an arc guiding arm, wherein the upper arc guiding arm and the lower arc guiding arm are respectively arranged at the top and the bottom of the insulator string; the arc extinguishing arm is arranged between the upper arc guiding arm and the lower arc guiding arm; the arc extinguishing arm is a vertical cylindrical structure, the top of which is provided with a conductive electrode and an insulating umbrella skirt, and the interior of the arc extinguishing chamber is provided with an arc extinguishing chamber, and the interior of the arc extinguishing chamber is provided with a disc-type multi-chamber arc extinguishing structure formed in a spiral series connection manner. Compared with the existing multi-chamber lightning protection device, the present invention is more compact, has better arc quenching ability, and has stronger current interruption ability; the present invention is applied to 35kV distribution network lines, which can quickly extinguish lightning current and power frequency current arcs, timely remove lightning damage, greatly reduce lightning tripping rate, and ensure safe and reliable operation of transmission lines.

Description

Technical Field

[0001] The invention relates to the technical field of overvoltage protection devices, and in particular to a spiral series-connected multi-chamber parallel gap device. Background Art

[0002] With the development of social economy, people's demand for electricity is increasing, and the requirements for technical and economic indicators of power grid operation of various voltage levels are increasing. The distribution network directly faces users, reasonably distributes and transmits electricity from the transmission network or regional power plant to thousands of households, and is closely related to people's daily activities. Its importance is increasing. For the 35kV distribution network, the insulation level of the line is low, and the lightning protection measures are few and limited. Once struck by lightning, the probability of lightning tripping is high, which may further lead to accidents such as lightning damage to line insulators and lightning arresters. It is not difficult to see that lightning accidents in distribution networks are extremely harmful and need to be effectively managed.

[0003] In recent years, domestic and foreign scholars have developed a new type of lightning protection device based on a multi-chamber structure. This type of device has the ability to interrupt lightning current and power frequency continuous current, and can quickly discharge lightning current into the ground without causing damage to equipment or the operation of relay protection devices, thereby achieving timely removal of lightning damage and effectively reducing the lightning trip rate. However, at present, this type of device contains a large number of chamber units, the device is bulky, and it is difficult to install on actual lines. Summary of the invention

[0004] In view of the shortcomings of the existing multi-chamber lightning protection device, the present invention provides a multi-chamber parallel gap device using spiral series connection, which uses a special spiral series connection method to reduce the height of the device and ensure the main gap distance at the installation. Even if the device fails in extreme cases, it will not cause line failure, which is convenient for use in 35kV distribution lines.

[0005] The technical solution adopted by the present invention is:

[0006] The invention discloses a multi-chamber parallel gap device adopting spiral series connection. The multi-chamber parallel gap device adopting spiral series connection is connected in parallel to one side of an insulator string, and is composed of an arc extinguishing arm and an arc guiding arm. The upper arc guiding arm and the lower arc guiding arm are respectively arranged at the top and the bottom of the insulator string, and one end is fixedly connected to the insulator string through a connecting hardware; the arc extinguishing arm is arranged between the upper arc guiding arm and the lower arc guiding arm, and is fixedly connected to the other end of the lower arc guiding arm, and a breakdown arc movement gap is left at the top of the arc extinguishing arm and the other end of the upper arc guiding arm; the arc extinguishing arm is a vertical cylindrical structure, a conductive electrode and an insulating umbrella skirt are arranged on the top, a chamber is arranged inside the chamber, and a disc-type multi-chamber arc extinguishing structure composed of spiral series connection is arranged inside the chamber.

[0007] Preferably, the disc-type multi-chamber arc-extinguishing structure is a cylinder formed by 13 to 20 layers of disc-type arc-extinguishing units connected in series, with an overall height of 150 to 230 mm, a diameter of 40 to 50 mm, and an interlayer height of 10 to 12 mm.

[0008] Preferably, each of the disk-type arc-extinguishing units comprises 7 arc-extinguishing chambers, which are specifically composed of 8 ablation-resistant spherical metal electrodes, a semi-enclosed space between adjacent spherical metal electrodes, and an insulating outer wall surrounding the electrodes.

[0009] Preferably, an arc extinguishing chamber is formed between the end discharge spherical metal electrode of the upper disk-type arc extinguishing unit and the head end spherical metal electrode of the lower disk-type arc extinguishing unit, and the discharge paths of adjacent layers of disk-type arc extinguishing units can be connected through the arc extinguishing chamber.

[0010] Preferably, the discharge path of a single-layer disk-type arc extinguishing unit is transmitted in a clockwise direction, the discharge path of adjacent layers of disk-type arc extinguishing units is transmitted in a vertical direction, and the discharge path of the overall disk-type multi-chamber arc extinguishing structure is spiral.

[0011] Preferably, the spherical metal electrode is made of galvanized steel and has a radius of 20 to 30 mm.

[0012] Preferably, the insulating umbrella skirt is made of silicone rubber material, with a length of 80 to 120 mm and a height of 10 to 20 mm; the conductive electrode is a metal hemisphere made of hot-dip galvanized steel, with a radius of 20 to 30 mm.

[0013] Preferably, the upper arc guide arm adopts a rod-shaped arc guide structure, which is a metal round rod made of hot-dip galvanized steel with a diameter of 15 to 25 mm, with a length of 400 to 450 mm and a width of 40 to 60 mm; the lower arc guide is a connecting fitting with a length of 400 to 450 mm.

[0014] The beneficial effects of the present invention are:

[0015] 1. The spiral series multi-chamber parallel gap device provided by the present invention adopts a special spiral series connection method between the chambers, which can greatly increase the number of chamber units at the same height and effectively improve the arc extinguishing ability of the overall structure.

[0016] 2. The spiral series multi-chamber parallel gap device provided by the present invention adopts a spiral series mode, which can effectively reduce the vertical height of the device. In actual use, it is convenient to install and use in the distribution network line with a short insulator string length. At the same time, the main gap distance at the installation is guaranteed. Even if the device fails in extreme cases, it will not cause line failure.

[0017] Therefore, from the perspective of structural performance and installation application, the spiral series multi-chamber parallel gap device provided by the present invention has a spontaneous arc extinguishing function and can effectively solve the problem of increased lightning tripping rate caused by installing parallel gaps. Compared with the existing multi-chamber lightning protection device, the device has better arc extinguishing performance, smaller device size, and is more convenient to install and use in actual lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the connection of the upper arc guide arm of the present invention;

[0020] Figure 3 It is a schematic diagram of the connection between the upper arc guide arm and the arc extinguishing arm of the present invention;

[0021] Figure 4 It is an overall schematic diagram of the disc-type multi-chamber arc extinguishing structure of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the disc-type arc extinguishing unit of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the arc extinguishing chamber of the present invention;

[0024] Figure 7 This is the arc quenching experiment curve;

[0025] Figure 1 —6, 1—insulator string, 2—arc extinguishing arm, 3—upper arc guide arm, 4—lower arc guide arm, 5—conductive electrode, 6—insulating umbrella skirt, 7—disc type multi-chamber arc extinguishing structure, 8—disc type arc extinguishing unit, 9—arc extinguishing chamber, 10—spherical metal electrode. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-3As shown, the present invention provides a spiral series multi-chamber parallel gap device, which is connected in parallel to one side of an insulator string 1, and consists of an arc extinguishing arm 2 and an arc guiding arm, wherein an upper arc guiding arm 3 and a lower arc guiding arm 4 are respectively arranged at the top and the bottom of the insulator string 1, and one end is fixedly connected to the insulator string 1 through a connecting hardware; the upper arc guiding arm 3 adopts a rod-shaped arc guiding structure, which is a metal round rod made of steel parts with a diameter of 15 to 25 mm and hot-dip galvanized, with a length of 400 to 450 mm and a width of 40 to 60 mm; the lower arc guiding arm is a connecting hardware, with a length of 400 to 450 mm.

[0028] The arc extinguishing arm 2 is arranged between the upper arc guide arm 3 and the lower arc guide arm 4, and is fixedly connected to the other end of the lower arc guide arm 4. A gap for the movement of the breakdown arc is left between the top of the arc extinguishing arm 2 and the other end of the upper arc guide arm 3. The arc extinguishing arm 2 is a vertical cylindrical structure, and a conductive electrode 5 and an insulating shed 6 are arranged on the top of the arc extinguishing arm 2. A chamber is arranged inside the arc extinguishing arm 2, and a disc-type multi-chamber arc extinguishing structure 7 composed of spiral series is arranged inside the chamber. The insulating shed 6 is made of silicone rubber material, with a length of 80 to 120 mm and a height of 10 to 20 mm. The conductive electrode 5 is a metal hemisphere made of hot-dip galvanized steel, and its radius is 20 to 30 mm.

[0029] Disc-type multi-chamber arc extinguishing structure:

[0030] like Figure 4-6 As shown, the disc-type multi-chamber arc-extinguishing structure 7 is a cylinder formed by 13 to 20 layers of disc-type arc-extinguishing units 8 connected in series, with an overall height of 150 to 230 mm, a diameter of 40 to 50 mm, and a layer-to-layer height of 10 to 12 mm. Each disc-type arc-extinguishing unit 8 includes 7 arc-extinguishing chambers 9, which are specifically composed of 8 ablation-resistant spherical metal electrodes 10, a semi-enclosed space between adjacent metal electrodes, and an insulating outer wall wrapped around the periphery. The spherical metal electrode 10 is made of galvanized steel, and its radius is 20 to 30 mm.

[0031] Discharge path of disc-type multi-chamber arc extinguishing structure:

[0032] The discharge path of the single-layer disk-type arc-extinguishing unit 8 is transmitted in the clockwise direction, the discharge path of the adjacent-layer disk-type arc-extinguishing unit 8 is transmitted in the vertical direction, and the discharge path of the overall disk-type multi-chamber arc-extinguishing structure 7 is spiral. It should be noted that: since an arc-extinguishing chamber 9 is formed between the end discharge spherical metal electrode 10 of the upper disk-type arc-extinguishing unit 8 and the head end spherical metal electrode 10 of the lower disk-type arc-extinguishing unit 8, the discharge paths of the adjacent-layer disk-type arc-extinguishing units 8 can be transmitted and connected through the arc-extinguishing chamber 9, so that the discharge paths of the adjacent-layer disk-type arc-extinguishing units 8 can be transmitted in the vertical direction.

[0033] The disc-type multi-chamber arc-extinguishing structure 7 is compared with the traditional parallel gap structure in structure:

[0034] If the disk-type multi-chamber arc-extinguishing structure 7 adopts the minimum size, the overall height H=150mm, the cylinder diameter L3=40mm, the interlayer height h=10mm, the radius R=4mm of the spherical metal electrode 10, the 3-pole conical shrinkage structure is adopted between the spherical metal electrodes 10, the spacing d1=2mm between the spherical metal electrodes 10, the discharge section length d4=8mm, the opening d2=4mm, d3=1mm, and the length d5=2mm of the single conical shrinkage structure; then each layer of the disk-type arc-extinguishing unit 8 can be provided with 7 arc-extinguishing chambers 9, and the disk-type multi-chamber arc-extinguishing structure 7 can be provided with 103 arc-extinguishing chambers 9 under this size. The conventional parallel gap structure can be provided with 13 arc-extinguishing chambers at most under the premise of keeping the overall size unchanged.

[0035] If the disc-type multi-chamber arc-extinguishing structure 7 adopts the maximum size, the overall height H=230mm, the cylinder diameter L3=50mm, the interlayer height h=12mm, the spherical metal electrode 10 R=4mm, the spherical metal electrodes 10 adopt a 3-pole conical shrinking structure, the spherical metal electrode 10 spacing d1=2mm, the discharge section length d4=8mm, the single conical shrinking structure opening d2=4mm, d3=1mm, length d5=2mm; then each layer of the disc-type arc-extinguishing unit 8 can be provided with 7 arc-extinguishing chambers 9, and the disc-type multi-chamber arc-extinguishing structure 7 can be provided with 159 arc-extinguishing chambers 9 under this size. The conventional parallel gap structure can be provided with at most 20 arc-extinguishing chambers under the premise of unchanged overall size.

[0036] It can be seen that the spiral series multi-chamber parallel gap device adopts a special spiral series connection method between the chambers, which can greatly increase the number of chamber units at the same height; the spiral series multi-chamber parallel gap device adopts a spiral series connection method, which can effectively reduce the vertical height of the device. In actual use, it is convenient to install and use in distribution lines with shorter insulator strings 1.

[0037] In order to further verify that the spiral series multi-chamber parallel gap device can accelerate arc quenching, the present invention conducted the following experiments:

[0038] Test equipment: The test platform is built using the impulse current generator, Rogowski coil, ultra-high-speed camera, voltage divider, oscilloscope and other equipment in the high-voltage test room. When the impulse current generator is working, the rectifier power supply first charges the capacitor group to the required voltage, and then sends a trigger pulse to break down the ball electrode, so that the capacitor group discharges through the resistor, inductor and the test object. The Rogowski coil is a non-contact current sensor based on the principle of electromagnetic induction, which measures the magnitude of the impulse current in the experiment. The ultra-high-speed camera has a very short exposure time and can capture the movement of the impulse arc in the experiment. The voltage divider uses a capacitive voltage divider to measure the impulse voltage, and a voltage equalizing cover is installed on the top of the voltage divider. The oscilloscope is used to record the voltage and current waveforms at both ends of the test object.

[0039] Test process: The disc-type multi-chamber arc extinguishing structure 7 adopts the minimum size such as Figure 7 Curve S1, the traditional parallel gap structure adopts the minimum size such as Figure 7 Curve S2; disc-type multi-chamber arc extinguishing structure 7 adopts the maximum size such as Figure 7 Curve S3, the conventional parallel gap structure adopts the maximum size such as Figure 7 Curve S4: Apply a 2kA 8 / 20μs impulse current to the test piece, and observe the motion characteristics and extinction characteristics of the arc in the multi-chamber structure impulse quenching stage.

[0040] The test results show that the discharge path of the disc-type multi-chamber arc extinguishing structure 7 is a spiral transmission, while the traditional parallel gap structure is a straight line transmission. Figure 7 As shown, when the disc-type multi-chamber arc extinguishing structure 7 adopts the minimum size, by analyzing the experimental photos, it can be known that the structure can quench the impact arc within 2ms; when the traditional parallel gap structure adopts the minimum size, by analyzing the experimental photos, it can be known that the structure can quench the impact arc within 4ms; when the disc-type multi-chamber arc extinguishing structure 7 adopts the maximum size, by analyzing the experimental photos, it can be known that the structure can quench the impact arc within 1.73ms; when the traditional parallel gap structure adopts the maximum size, by analyzing the experimental photos, it can be known that the structure can quench the impact arc within 3.8ms.

[0041] In summary, the spiral series multi-chamber parallel gap device provided by the present invention has a spontaneous arc extinguishing function by setting a disc-type multi-chamber arc extinguishing structure 7 compared with the traditional parallel gap structure, and can effectively solve the problem of increased lightning tripping rate caused by installing parallel gaps. Compared with the existing multi-chamber lightning protection device, the device has better arc extinguishing performance, smaller device size, and is more convenient to install and use in actual lines.

Claims

1. A spiral series multi-chamber parallel gap device, characterized in that: The spiral series multi-chamber parallel gap device is connected in parallel to one side of the insulator string, and is composed of an arc extinguishing arm and an arc guiding arm. The upper arc guiding arm and the lower arc guiding arm are respectively arranged at the top and bottom of the insulator string, and one end is fixedly connected to the insulator string through a connecting fitting. The arc extinguishing arm is arranged between the upper arc guide arm and the lower arc guide arm, and is fixedly connected to the other end of the lower arc guide arm. A gap for the movement of the breakdown arc is left between the top of the arc extinguishing arm and the other end of the upper arc guide arm. The arc extinguishing arm is a vertical cylindrical structure, with a conductive electrode and an insulating shed skirt on the top, a chamber inside, and a disc-type multi-chamber arc extinguishing structure composed of spiral series connection inside the chamber. The disc-type multi-chamber arc-extinguishing structure is a cylinder formed by 13 to 20 layers of disc-type arc-extinguishing units connected in series, with an overall height of 150 to 230 mm, a diameter of 40 to 50 mm, and an interlayer height of 10 to 12 mm; Each disc arc extinguishing unit contains 7 arc extinguishing chambers, which are specifically composed of 8 ablation-resistant spherical metal electrodes, a semi-enclosed space between adjacent spherical metal electrodes, and an insulating outer wall surrounding the outer surface; An arc extinguishing chamber is formed between the end discharge spherical metal electrode of the upper disc-type arc extinguishing unit and the head end spherical metal electrode of the lower disc-type arc extinguishing unit, and the discharge paths of the adjacent disc-type arc extinguishing units can be connected through the arc extinguishing chamber; The discharge path of a single-layer disk-type arc extinguishing unit is transmitted in a clockwise direction, the discharge path of adjacent layers of disk-type arc extinguishing units is transmitted in a vertical direction, and the discharge path of the overall disk-type multi-chamber arc extinguishing structure is spiral.

2. The spiral series multi-chamber parallel gap device according to claim 1, characterized in that: The spherical metal electrode is made of galvanized steel and has a radius of 20 to 30 mm.

3. The spiral series multi-chamber parallel gap device according to claim 1, characterized in that: The insulating umbrella skirt is made of silicone rubber material, with a length of 80-120 mm and a height of 10-20 mm; the conductive electrode is a metal hemisphere made of hot-dip galvanized steel, with a radius of 20-30 mm.

4. The spiral series multi-chamber parallel gap device according to claim 1, characterized in that: The upper arc guide arm adopts a rod-shaped arc guide structure, which is a metal round rod made of hot-dip galvanized steel with a diameter of 15-25mm, a length of 400-450mm, and a width of 40-60mm; the lower arc guide is a connecting fitting with a length of 400-450mm.

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