阅读说明：本技术 避雷器、避雷器冷却组件及输电系统 (Arrester, arrester cooling module and transmission system ) 是由 刘杉 刘泽洪 卢理成 于 2019-10-09 设计创作，主要内容包括：本发明公开一种避雷器、避雷器冷却组件及输电系统,涉及电力设备技术领域,用于提高避雷器的散热效率,使避雷器能够在输电电压等级不断提升的输电系统或者其他输电系统中长时间正常运行。该避雷器包括：底座；上压盖；多个电阻阀片,叠加设置于底座与上压盖之间,以构造出避雷器芯柱；至少两个固定杆,每个固定杆的一端连接底座,另一端连接上压盖,所有固定杆沿避雷器芯柱的周向方向依次布置。通过本发明的技术方案,提高了避雷器的散热效率,使避雷器的电阻阀片不易发生热损坏。(The invention discloses an arrester, an arrester cooling assembly and a power transmission system, relates to the technical field of power equipment, and aims to improve the heat dissipation efficiency of the arrester and enable the arrester to normally operate for a long time in a power transmission system or other power transmission systems with continuously improved power transmission voltage levels. This arrester includes: a base; a gland is arranged; the resistor valve plates are arranged between the base and the upper gland in an overlapping mode to construct a lightning arrester core column; the lightning arrester comprises at least two fixed rods, wherein one end of each fixed rod is connected with the base, the other end of each fixed rod is connected with the upper gland, and all the fixed rods are sequentially arranged along the circumferential direction of the lightning arrester core column. By the technical scheme, the heat dissipation efficiency of the lightning arrester is improved, and the resistance valve plate of the lightning arrester is not easy to be thermally damaged.)

1. An arrester, characterized in that the arrester comprises:

a base;

a gland is arranged;

the resistor valve plates are arranged between the base and the upper gland in an overlapping mode to construct a lightning arrester core column;

the lightning arrester comprises at least two fixing rods, wherein one end of each fixing rod is connected with the base, the other end of each fixing rod is connected with the upper gland, and all the fixing rods are sequentially arranged along the circumferential direction of the lightning arrester core column.

2. The surge arrester of claim 1 wherein the surge arrester core column further comprises:

and each metal cushion block is arranged between two adjacent resistance valve plates.

3. A lightning arrester according to claim 2, characterized in that each metal spacer is provided with a first positioning structure, each resistive valve plate is provided with a second positioning structure, and the metal spacer and the resistive valve plate which are in contact with each other are radially positioned by the first positioning structure and the second positioning structure;

wherein, one of the first positioning structure and the second positioning structure is a clamping protrusion, and the other is a clamping groove.

4. A surge arrester as claimed in any one of claims 1 to 3, characterized in that the surge arrester further comprises:

and the elastic component is arranged between the lightning arrester core column and the base.

5. A surge arrester as claimed in any one of claims 1 to 3, wherein one end of each of the fixing bars to which the upper cover is connected is provided with a plurality of first connecting portions arranged in series in a length direction of the fixing bar;

go up the gland on be provided with two at least second connecting portion, at least two the second connecting portion are followed go up the circumference direction of gland arranges in proper order, every the second connecting portion can with one fixed connection can be dismantled to arbitrary first connecting portion on the dead lever.

6. A surge arrester as claimed in any one of claims 1 to 3, characterized in that all the fixing rods are arranged uniformly in the circumferential direction of the surge arrester core column.

7. The surge arrester of any of claims 1 through 3 further comprising a first electrode passing through the upper gland and connected to one end of the surge arrester stem, and a second electrode passing through the base and connected to the other end of the surge arrester stem.

8. A surge arrester as claimed in any one of claims 1 to 3, characterized in that the surge arrester post is externally provided with an insulating coating.

9. An arrester cooling assembly, comprising:

a cooling container having at least one surge arrester mounted therein, each surge arrester being as claimed in any one of claims 1 to 8;

and a cooling member provided in the cooling container for reducing a temperature in the cooling container.

10. A lightning arrester cooling assembly according to claim 9 wherein the cooling member comprises an evaporator;

the lightning arrester cooling assembly further comprises a compressor, a condenser and a throttling element, wherein the compressor, the condenser and the throttling element are located outside the cooling container, and the throttling element and the evaporator are sequentially connected through a pipeline to form a closed loop.

11. A lightning arrester cooling assembly according to claim 10 wherein the evaporator comprises:

the heat exchange coil is communicated between the throttling element and the compressor and comprises a plurality of straight pipe sections which are arranged in parallel and a U-shaped pipe section which is communicated with every two adjacent straight pipe sections;

and the plurality of radiating fins are sleeved on the straight pipe section, and a space is reserved between every two radiating fins.

12. The arrester cooling assembly of claim 10 further comprising:

the air duct plate is arranged in the cooling container, a cooling channel with an air return inlet and an air outlet is formed between the air duct plate and the inner wall of the cooling container, and the evaporator is installed in the cooling channel;

and the wind wheel is arranged in the cooling channel and used for enabling the airflow to enter the cooling channel from the air return opening to exchange heat with the evaporator and enabling the airflow after heat exchange to be discharged from the air outlet.

13. The lightning arrester cooling assembly of claim 12 wherein the return air opening of the cooling channel is located at a bottom of the cooling container and the outlet air opening of the cooling channel is located at a top of the cooling container.

14. The arrester cooling assembly of claim 12 further comprising a deflector disposed at the air outlet;

the air deflector can be rotatably arranged on the cooling container, or the air deflector can be rotatably arranged on the air duct plate.

15. The lightning arrester cooling assembly according to claim 12, wherein the cooling container includes a container body having an opening and a door body for opening and closing the opening, the cooling passage is formed between the container body and the air duct plate, and at least one of the lightning arresters is located between the air duct plate and the door body.

16. A power transmission system, characterized in that the power transmission system comprises:

an arrester as claimed in any one of claims 1 to 8; or

An arrester cooling assembly as claimed in any of claims 9 to 15.

Technical Field

The invention relates to the technical field of power equipment, in particular to a lightning arrester, a lightning arrester cooling assembly and a power transmission system.

Background

At present, the lightning arrester main body is usually wrapped and sealed by epoxy resin and silicon rubber insulators. Because the arrester structure is airtight, lead to the heat in the arrester not in time to distribute, the radiating efficiency is extremely low. Further, the components in the arrester are easily aged or damaged due to the over-high temperature, and the chargeability of the arrester is limited. Therefore, the existing lightning arrester is difficult to adapt to the continuous promotion of the transmission voltage grade, is difficult to continuously and normally operate for a long time at a high charge rate in a transmission system, and simultaneously reduces the aging loss and the failure rate of the lightning arrester.

Disclosure of Invention

The invention aims to provide an arrester and a power transmission system, which are used for improving the heat dissipation efficiency of the arrester so as to improve the charge rate of the arrester, so that the arrester can normally operate for a long time at a high charge rate in the power transmission system with continuously improved power transmission voltage class, and simultaneously, the aging loss and the failure rate of the arrester are reduced.

In order to achieve the above purpose, the invention provides the following technical scheme:

a first aspect of the present invention provides an arrester comprising: a base; a gland is arranged; the resistor valve plates are arranged between the base and the upper gland in an overlapping mode to construct a lightning arrester core column; the lightning arrester comprises at least two fixed rods, wherein one end of each fixed rod is connected with the base, the other end of each fixed rod is connected with the upper gland, and all the fixed rods are sequentially arranged along the circumferential direction of the lightning arrester core column.

Optionally, the arrester stem further comprises: and each metal cushion block is arranged between two adjacent resistance valve plates.

Optionally, each metal cushion block is provided with a first positioning structure, each resistance valve plate is provided with a second positioning structure, and the metal cushion blocks and the resistance valve plates which are in contact with each other are radially positioned through the first positioning structures and the second positioning structures; wherein, one of first location structure and second location structure is the joint arch, and the other is the joint recess.

Optionally, the arrester further comprises: and the elastic component is arranged between the lightning arrester core column and the base.

Optionally, one end of each fixing rod, which is connected with the upper gland, is provided with a plurality of first connecting portions, and the plurality of first connecting portions are sequentially arranged along the length direction of the fixing rod; the upper gland is provided with at least two second connecting parts, the at least two second connecting parts are sequentially arranged along the circumferential direction of the upper gland, and each second connecting part can be detachably and fixedly connected with any first connecting part on one fixed rod.

Alternatively, all fixation bars are evenly arranged in the circumferential direction of the lightning arrester core column.

Optionally, the arrester further comprises a first electrode passing through the upper gland and connected with one end of the arrester stem, and a second electrode passing through the base and connected with the other end of the arrester stem.

Optionally, the lightning arrester post is externally provided with an insulating coating.

A second aspect of the present invention provides an arrester cooling assembly, comprising: the lightning arrester comprises a cooling container, a plurality of lightning arresters and a plurality of cooling units, wherein at least one lightning arrester is arranged in the cooling container, and each lightning arrester is the lightning arrester in any one of the technical schemes; and a cooling member provided in the cooling container for reducing the temperature in the cooling container.

Optionally, the cooling component comprises an evaporator; the lightning arrester cooling assembly further comprises a compressor, a condenser and a throttling element which are located outside the cooling container, and the compressor, the condenser, the throttling element and the evaporator are sequentially connected through pipelines to form a closed loop.

Optionally, the evaporator comprises: the heat exchange coil is communicated between the throttling element and the compressor and comprises a plurality of straight pipe sections which are arranged in parallel and a U-shaped pipe section which is communicated with every two adjacent straight pipe sections; and the plurality of radiating fins are sleeved on the straight pipe section, and a space is reserved between every two radiating fins.

Optionally, the arrester cooling assembly further comprises: the cooling device comprises an air duct plate arranged in a cooling container, a cooling channel with an air return inlet and an air outlet is formed between the air duct plate and the inner wall of the cooling container, and an evaporator is arranged in the cooling channel; and the wind wheel is arranged in the cooling channel and used for enabling the airflow to enter the cooling channel from the air return opening to exchange heat with the evaporator and enabling the airflow after heat exchange to be discharged from the air outlet.

Optionally, the air return opening of the cooling channel is located at the bottom of the cooling container, and the air outlet opening of the cooling channel is located at the top of the cooling container.

Optionally, the arrester cooling assembly further comprises an air deflector arranged at the air outlet; the air deflector can be rotatably mounted on the cooling container, or the air deflector can be rotatably mounted on the air duct plate.

Optionally, the cooling container includes a container body having an opening and a door body for opening and closing the opening, the cooling passage is formed between the container body and the air duct plate, and the at least one arrester is located between the air duct plate and the door body.

A third aspect of the invention provides a power transmission system comprising a lightning arrester as claimed in any one of the preceding claims.

Compared with the prior art, the lightning arrester cooling assembly and the power transmission system have the following beneficial effects:

the lightning arrester provided by the invention comprises a base, an upper gland, a plurality of resistance valve plates and at least two fixing rods, wherein the plurality of resistance valve plates are overlapped and arranged between the base and the upper gland, so that the plurality of resistance valve plates are constructed into a lightning arrester core column, and the lightning arrester core column can be connected in an electric power system and used for protecting electrical equipment from being damaged by high transient overvoltage. The base is connected to the one end of every dead lever, and the gland is connected to the other end, and all dead levers are evenly arranged along the circumferential direction of above-mentioned arrester stem, can utilize these at least two dead levers to make gland and base relatively fixed on like this to can utilize gland and base to compress tightly fixed in order to form the arrester stem with a plurality of resistance valve blocks, this arrester has simple structure, the convenient advantage of equipment. In addition, the lightning arrester provided by the invention can also enable air to be in direct contact with each resistance valve block, so that heat on each resistance valve block can be quickly dissipated into the air, the temperature of each resistance valve block is greatly reduced, each resistance valve block is not easy to damage due to overhigh temperature, the charge rate of the lightning arrester core column is further improved, the current under a continuous working state can be larger, the residual voltage can be lower, and the lightning arrester core column can normally and stably operate at a high charge rate for a long time in a power transmission system with continuously improved power transmission voltage level.

The lightning arrester cooling assembly comprises the lightning arrester in any technical scheme, and the lightning arrester is arranged in the cooling container, and the cooling container is internally provided with cooling components for reducing the temperature, such as an evaporator, an ice bag and the like, so that the cooling effect on each resistance valve plate of the lightning arrester can be further reduced.

The beneficial effects that the power transmission system provided by the invention can achieve are the same as those that the lightning arrester and the lightning arrester cooling assembly provided by the technical scheme can achieve, and are not repeated herein.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of a lightning arrester according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a resistance valve sheet of an arrester according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a metal spacer of a lightning arrester according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an arrester cooling assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an arrester cooling assembly according to another embodiment of the present invention.

Reference numerals:

10-a lightning arrester, 11-a base, 12-an upper gland,

13-lightning arrester core column, 131-resistance valve sheet, 132-metal cushion block,

14-a fixing bar, 141-a first connection, 121-a second connection,

15-an elastic member, 16-a first electrode, 17-a second electrode,

1311-second location structure, 1321-first location structure, 20-arrester cooling assembly,

21-cooling vessel, 22-cooling section, 221-evaporator,

2211-heat exchange coil, 2212-radiating fins, 23-compressor,

24-condenser, 25-throttling element, 26-air duct plate,

261-air outlet, 262-air return inlet, 27-wind wheel,

28-air deflector, 211-container body, 212-opening.

Detailed Description

For the convenience of understanding, the lightning arrester and the power transmission system provided by the embodiment of the invention are described in detail below with reference to the attached drawings.

Referring to fig. 1, some embodiments of the present invention provide an arrester 10, the arrester 10 including: the lightning arrester comprises a base 11, an upper gland 12, a plurality of resistance valve plates 131 and at least two fixing rods 14, wherein the plurality of resistance valve plates 131 are overlapped and arranged between the base 11 and the upper gland 12, so that the plurality of resistance valve plates 131 form an arrester core column 13, and the arrester core column 13 can be connected in an electric power system to protect electrical equipment from being damaged by high transient overvoltage. One end of each fixing rod 14 is connected with the base 11, the other end of each fixing rod is connected with the upper gland 12, all the fixing rods 14 are sequentially arranged along the circumferential direction of the lightning arrester core column 13, so that the upper gland 12 and the base 11 can be relatively fixed by utilizing the at least two fixing rods 14, and therefore the plurality of resistance valve plates 131 can be pressed and fixed by utilizing the upper gland 12 and the base 11 to form the lightning arrester core column 13, and the lightning arrester 10 has the advantages of being simple in structure and convenient to assemble. In addition, the lightning arrester 10 provided by the invention can also make air directly contact with each resistance valve sheet 131, so that heat on each resistance valve sheet 131 can be quickly dissipated into the air, the temperature of each resistance valve sheet 131 is greatly reduced, each resistance valve sheet 131 is not easy to be damaged due to overhigh temperature, the charge rate of the lightning arrester core column 13 is further improved, the current under a continuous working state can be larger, the residual voltage can be lower, and the lightning arrester core column 13 can normally and stably operate at a high charge rate for a long time in a power transmission system with continuously-improved power transmission voltage level.

In some embodiments, referring to fig. 1, the surge arrester stem 13 further comprises: and each metal cushion block 132 is arranged between two adjacent resistance valve plates 131. Due to the design, a gap can be reserved between two adjacent resistance valve plates 131, and the heat dissipation effect of the resistance valve plates 131 is improved. And partial heat on the resistance valve plate 131 can be conducted to the corresponding metal cushion block 132, so that the temperature of the resistance valve plate 131 can be further reduced, and the occurrence of the situation that the resistance valve plate 131 is burnt out due to overheating is reduced.

The metal pad 132 is used as a transmission medium for voltage and current, and may be made of a conductive material such as copper or aluminum material.

In some embodiments, referring to fig. 2 and 3, each metal spacer 132 is provided with a first positioning structure 1321, each resistance valve plate 131 is provided with a second positioning structure 1311, and the metal spacer 132 and the resistance valve plate 131 which are in contact with each other are radially positioned by the first positioning structure 1321 and the second positioning structure 1311; one of the first positioning structure 1321 and the second positioning structure 1311 is a clamping protrusion, and the other is a clamping groove. For example, as shown in fig. 2 and fig. 3, the resistance valve sheet 131 is provided with a clamping groove, and the metal spacer 132 is provided with a clamping protrusion. By the design, each resistance valve sheet 131 on the lightning arrester core column 13 is not easily separated from each metal cushion block 132 due to collision, and the firmness and reliability of the whole structure are improved.

In some embodiments, as shown in fig. 1, the arrester 10 further includes: and an elastic member 15 provided between the arrester stem 13 and the base 11. Due to the design, the lightning arrester 10 is convenient to mount, has certain buffering capacity and is not easy to damage when being collided.

In some embodiments, as shown in fig. 1, one end of each fixing lever 14, to which the upper gland 12 is connected, is provided with a plurality of first connecting parts 141, and the plurality of first connecting parts 141 are sequentially arranged in a length direction of the fixing lever 14; the upper gland 12 is provided with at least two second connecting portions 121, the at least two second connecting portions 121 are sequentially arranged along the circumferential direction of the upper gland 12, and each second connecting portion 121 can be detachably and fixedly connected with any one first connecting portion 141 on the fixing rod 14. By such a design, the second connection portion 121 of the upper cover 12 can be connected to the different first connection portions 141 of the fixing rod 14, so that the adjustment of the distance between the upper cover 12 and the base 11 can be realized, and the plurality of resistance valve sheets 131 can be conveniently and reliably pressed and fixed.

Illustratively, all the fixing bars 14 are uniformly arranged along the circumferential direction of the lightning arrester core column 13, and all the second connecting portions 121 are uniformly arranged along the circumferential direction of the upper gland 12, so that the stress on the periphery of the lightning arrester core column 13 is uniform, and the stress on each fixing bar 14 is uniform, thereby being beneficial to improving the stability and reliability of the lightning arrester 10.

Illustratively, the plurality of first connecting portions 141 are sequentially arranged at intervals along the length direction of the fixing rod, and the number of the first connecting portions 141 can be reduced while the lightning arrester core column 13 is fixed by reasonably controlling the interval between any two adjacent first connecting portions 141.

In some embodiments, as shown in fig. 1, the surge arrester 10 further includes a first electrode 16 passing through the upper cap 12 and connected to one end of the surge arrester stem 13, and a second electrode 17 passing through the base 11 and connected to the other end of the surge arrester stem 13.

In this embodiment, the first electrode 16 and the second electrode 17 are arranged to facilitate connection of the lightning arrester 10 to a power system, for example, the lightning arrester 10 is connected between a power transmission line and a ground line through the first electrode 16 and the second electrode 17, that is, a plurality of resistance valve sheets 131 in the lightning arrester 10 are connected in series between the power transmission line and the ground line to protect electrical equipment connected to the power transmission line from high transient overvoltage.

In some embodiments, the lightning arrester stem 13 is provided with an insulating coating outside. In this scheme, through set up insulating coating outside lightning arrester stem 13, the demand of satisfying external insulation creep distance that can be better, security and reliability are promoted.

Referring to fig. 4, some embodiments of the present invention provide an arrester cooling assembly 20, the arrester cooling assembly 20 including: the lightning arrester comprises a cooling container 21, wherein at least one lightning arrester 10 is installed in the cooling container 21, and each lightning arrester 10 is the lightning arrester 10 in any one technical scheme; and a cooling member 22 provided in the cooling container 21 for reducing the temperature in the cooling container 21.

The lightning arrester cooling assembly 20 provided by the invention comprises the lightning arrester 10 in any one of the above technical schemes, and the lightning arrester 10 is arranged in the cooling container 21, and the cooling component 22 for reducing the temperature, such as the evaporator 221, the ice bag and the like, is arranged in the cooling container 21, so that the cooling effect on each resistance valve sheet 131 of the lightning arrester 10 can be further reduced.

By way of example, the cooling container 21 may be a building, such as a house fixed to the ground, which may be made of bricks and/or cement. Of course, the cooling container 21 may not be fixed to the ground, for example, a movable house such as a container, for convenience of movement.

For example, only one lightning arrester 10 may be disposed in the cooling container 21, or a plurality of lightning arresters 10 may be disposed at the same time.

It is worth mentioning that, with the continuous development of the ultra-high Voltage transmission technology, a transmission system combining a power grid phase-change Converter valve (LCC) and a Voltage source Converter Valve (VSC) becomes an indispensable part for the operation of the power grid. For example, in one common configuration of a power transmission system, the inverting side thereof is typically provided with at least one LCC and at least one VSC in cascade; the LCC is used for bearing high-voltage section voltage, such as 400 kV-800 kV; VSCs are used to carry low voltage segment voltages, such as 0kV to 400 kV. The LCC in the power transmission system has strong dependence on a receiving-end alternating current system, and is easy to cause phase commutation failure when the receiving-end alternating current system has alternating current fault, and the voltage drops to zero to form a short-circuit path. And the VSC does not have the current path to form when receiving end alternating current system appearance ac fault, also makes LCC carry out the voltage current transfer to cascaded VSC, charges to the electric capacity in the VSC. The voltage on the capacitors within the VSC will therefore increase rapidly with increasing fault current. Through setting up this arrester 10 or arrester cooling module 20 in above-mentioned transmission system, because this arrester 10 or arrester cooling module 20's radiating efficiency is high, has higher charge rate, the electric current under the continuous operating condition can be bigger, the residual voltage is lower, the earial drainage effect is better, make the voltage electric current that bears on the VSC difficult exceed its withstand voltage resistant current ability, improved the protection effect to VSC.

In some embodiments, as shown in fig. 4, the cooling component 22 includes an evaporator 221; the lightning arrester cooling assembly 20 further comprises a compressor 23, a condenser 24 and a throttling element 25 which are positioned outside the cooling container 21, wherein the compressor 23, the condenser 24, the throttling element 25 and the evaporator 221 are sequentially connected through pipelines to form a closed loop.

In this embodiment, the compressor 23 may generate a high-temperature high-pressure gaseous refrigerant, after the high-temperature high-pressure gaseous refrigerant flows to the condenser 24, the high-temperature high-pressure gaseous refrigerant is liquefied and releases heat in the condenser 24 to form a high-temperature high-pressure liquid refrigerant, then the high-temperature high-pressure liquid refrigerant is throttled and depressurized by the throttling element 25 to form a low-temperature low-pressure liquid refrigerant, then the low-temperature low-pressure liquid refrigerant enters the evaporator 221 to be evaporated and absorb heat to form a low-temperature low-pressure gaseous refrigerant, and finally the low-temperature low-pressure gaseous refrigerant returns. The phase change effect of the refrigerant in the multiple circulating flow process is utilized in the scheme, the heat inside the cooling container 21 is rapidly dissipated to the environment outside the cooling container 21, the temperature inside the cooling container 21 can be greatly reduced, the heat on the resistance valve plate 131 of the lightning arrester 10 is rapidly dissipated, the temperature of the resistance valve plate 131 is effectively reduced, the resistance valve plate 131 is not easily damaged due to overhigh temperature, the charging rate of the resistance valve plate 131 is further improved, the current in the continuous working state can be larger, the residual voltage of the resistance valve plate 131 is lower, and the lightning arrester 10 can normally and stably operate for a long time in a power transmission system with continuously improved power transmission voltage level.

To improve the integrity of the arrester cooling assembly 20, it is exemplary to fix the compressor 23, the condenser 24 and the throttling element 25 to the outer wall of the cooling container 21, respectively, in order to move the arrester cooling assembly 20. Furthermore, a grid plate may be provided so as to connect the grid plate with the cooling container 21, and an accommodation space for accommodating the compressor 23, the condenser 24, and the throttle member 25 is defined between the grid plate and the cooling container 21 to protect the compressor 23, the condenser 24, and the throttle member 25 from damage. The grid plate is provided with a plurality of air ports, a fan can be further arranged in the accommodating space in order to improve the heat exchange effect between the condenser 24 and the external environment of the accommodating space, external air flow enters the accommodating space through one part of air ports on the grid plate by using the fan to exchange heat with the condenser 24, and the air flow after heat exchange is discharged out of the accommodating space from the other part of air ports.

In some embodiments, as shown in fig. 5, the evaporator 221 includes: the heat exchange coil 2211 is communicated between the throttling element 25 and the compressor 23, and the heat exchange coil 2211 comprises a plurality of straight pipe sections which are arranged in parallel and a U-shaped pipe section which is communicated with every two adjacent straight pipe sections; and the plurality of radiating fins 2212 are sleeved on the straight pipe section, and an interval is reserved between every two radiating fins 2212.

In this embodiment, the evaporator 221 includes a heat exchanging coil 2211 and a plurality of heat dissipating fins 2212, wherein the heat dissipating coil includes a plurality of straight tube sections arranged in parallel and a U-shaped tube section connecting every two adjacent straight tube sections, so as to form the heat exchanging coil 2211 connected between the throttling element 25 and the compressor 23, and the heat exchanging coil 2211 may be made of a material with high thermal conductivity, such as copper or aluminum material. And through with a plurality of radiating fin 2212 suit on the straight tube section, set up and leave the interval between per two radiating fin 2212 and increased the contact heat transfer area of evaporimeter 221 with the air current to promote the heat exchange efficiency of evaporimeter 221 by a wide margin, be favorable to further reducing the temperature of each resistance valve block 131, reduce the risk of each resistance valve block 131 heat damage.

In some embodiments, as shown in fig. 5, the arrester cooling assembly 20 further comprises: an air duct plate 26 disposed in the cooling container 21, a cooling channel having an air return port 262 and an air outlet port 261 is configured between the air duct plate 26 and the inner wall of the cooling container 21, and an evaporator 221 is installed in the cooling channel; and the wind wheel 27 is arranged in the cooling channel and is used for enabling the airflow to enter the cooling channel from the air return opening 262 to exchange heat with the evaporator 221 and enabling the airflow after heat exchange to be discharged from the air outlet 261.

In this embodiment, by disposing the air duct plate 26 in the cooling container 21, a cooling channel having an air return opening 262 and an air outlet 261 is defined between the inner wall of the cooling container 21 and the air duct plate 26, and by disposing the evaporator 221 and the air duct 27 in the cooling channel, the rotation of the air duct 27 enables the air flow outside the cooling channel in the cooling container 21 to enter the cooling channel from the air return opening 262 to exchange heat with the evaporator 221, and enables the low-temperature air flow generated after exchanging heat with the evaporator 221 to be discharged from the air outlet 261, so as to cool the plurality of resistance valve plates 131 of the lightning arrester 10. Through the above scheme, the circulation that makes the air current in the cooling vessel 21 can be quick flows, has improved the thermal speed of giving off on the resistance valve piece 131 to reduce the temperature of resistance valve piece 131 by a wide margin, make resistance valve piece 131 be difficult for damaging because of the high temperature, and then make this arrester 10 can be in the continuous transmission system who promotes of transmission voltage level long-time normal stable operation, improve the protection effect to VSC.

Exemplarily, the wind wheel 27 is a cross flow wind wheel 27 or an axial flow wind wheel 27.

Illustratively, referring to FIG. 5, the air return openings 262 and the air outlet openings 261 are located on different sides of the cooling channel, respectively. In this embodiment, through setting up return air inlet 262 and air outlet 261 respectively in cooling channel's different sides, can further improve the circulating flow effect of air current, and then improved the heat exchange efficiency between air current and the evaporimeter 221, and the heat exchange efficiency between air current and each resistance valve block 131 of arrester 10, the heat that makes on each resistance valve block 131 can be quick is taken away.

Illustratively, referring to fig. 5, the air return openings 262 of the cooling channels are located at the bottom of the cooling container 21, and the air outlet openings 261 of the cooling channels are located at the top of the cooling container 21. By adopting the design, the air flow with higher temperature can return to the cooling channel to exchange heat with the evaporator 221, and then the low-temperature air flow after heat exchange is discharged from the air outlet 261 at the top. Because the cold air current can top-down flow under the effect of gravity, consequently be favorable to making the air current carry out abundant heat transfer with the outer arrester 10 of cooling channel, heat exchange efficiency has been improved, thereby the heat on the resistance valve block 131 that makes arrester 10 can distribute rapidly, reduce the temperature of resistance valve block 131 by a wide margin, make resistance valve block 131 be difficult for damaging because of the high temperature, and then make this arrester 10 can be in the continuous normal stable operation for a long time of the transmission system who promotes of transmission voltage grade, improve the protection effect to VSC.

In some embodiments, as shown in fig. 5, the arrester cooling assembly 20 further includes a wind deflector 28 disposed at the wind outlet 261; the air deflector 28 may be rotatably mounted on the cooling container 21, or the air deflector 28 may be rotatably mounted on the air duct plate 26.

In this embodiment, the air deflector 28 is disposed at the air outlet 261, and the air deflector 28 is rotatably mounted on the cooling container 21 or the air duct plate 26, so that the direction of the cold air discharged from the air outlet 261 can be adjusted by the air deflector 28, and the cold air discharged from the air outlet 261 can accurately flow to each resistance valve plate 131 of the lightning arrester 10, and each resistance valve plate 131 can be cooled better, which has the advantages of high flexibility and high practicability.

Illustratively, the coanda surface is arranged on the windward side of the air deflector 28, and the airflow discharged from the air outlet 261 by the cooling channel can flow to each resistance valve sheet 131 of the arrester 10 more smoothly by the coanda surface, so that the airflow is not easy to bounce when blowing to the coanda surface of the air deflector 28, and further is not easy to generate airflow turbulence, which is beneficial to further enhancing the flowability of the airflow and improving the heat dissipation efficiency of each resistance valve sheet 131.

For example, the air deflector 28 is rotatably connected to the cooling container 21 or the air duct plate 26 at the air outlet 261 via a pivot, which may be disposed horizontally, or disposed at an angle with respect to the horizontal, such as at 30 degrees, 45 degrees, 60 degrees, or 90 degrees.

For the convenience of control, the pivot shaft can be connected with a motor, and the rotation control of the air deflector 28 can be realized through the rotation of an output shaft of the motor. For example, when the lightning arrester 10 works, the air deflector 28 can be controlled by the motor to swing back and forth, so that the effect of swinging air outlet is realized, the cooling effect of each resistance valve sheet 131 is further improved, and the phenomenon that a certain resistance valve sheet 131 is damaged due to overhigh temperature is not easy to occur.

In some embodiments, referring to fig. 5, the cooling container 21 includes a container body 211 having an opening 212, and a door body for opening and closing the opening 212, the cooling passage is formed between the container body 211 and the air duct plate 26, and the surge arrester stem 13 is located between the air duct plate 26 and the door body.

In this embodiment, the cooling container 21 includes a container main body 211 and a door body, the container main body 211 defines a containing cavity with an opening 212, the door body is used for opening and closing the opening 212, the air duct plate 26 is disposed in the containing cavity of the container main body 211, the cooling channel is formed between the inner wall of the container main body 211 and the air duct plate 26, and the lightning arrester 10 is installed between the air duct plate 26 and the door body, so that the lightning arrester 10 can be conveniently maintained by opening the door body, and convenience and practicability are improved.

Illustratively, the door body is slidably mounted on the container body 211, and the opening 212 of the container body 211 can be opened and closed by sliding the door body; alternatively, the door body may be rotatably attached to the container body 211, and the opening 212 of the container body 211 may be opened and closed by rotating the door body.

In some embodiments, the arrester cooling assembly 20 further includes a metal heat conducting pipe communicated between the throttling element 25 and the compressor 23, and spirally wound on the arrester stem 13 of the arrester 10 along the axial direction of the arrester stem 13. This is designed to allow part of the low-temperature low-pressure liquid refrigerant flowing out of the throttling element 25 to flow through the metal heat transfer pipe. Be the heliciform through the axial with metal heat pipe along arrester stem 13 and wind and establish on arrester stem 13, make the liquid refrigerant of flowing through the metal heat pipe can carry out the heat transfer with arrester stem 13, make the liquid refrigerant absorb heat the evaporation and form the gaseous state refrigerant, take away the heat on each resistance valve block 131 of arrester stem 13 simultaneously, have simple structure, advantage that the radiating efficiency is high.

Illustratively, the throttling element 25 comprises a capillary tube and/or an expansion valve.

An embodiment of the present invention also provides a power transmission system, including: the lightning arrester 10 according to any of the above solutions; or the lightning arrester cooling assembly 20 according to any of the above-mentioned solutions.

According to the power transmission system provided by the invention, as the lightning arrester 10 and the lightning arrester cooling assembly 20 have high heat dissipation efficiency, the temperature of each resistance valve sheet 131 can be effectively reduced, and the heat on each resistance valve sheet 131 can be quickly dissipated, so that the voltage resistance of each resistance valve sheet 131 of the lightning arrester 10 can be improved, each resistance valve sheet 131 is not easily damaged due to overhigh temperature, and further, when the transmission voltage level is continuously improved, VSC can be effectively protected through the lightning arrester 10.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.