WO2014113911A1

WO2014113911A1 - Liquefaction prevention apparatus for sulfur hexafluoride gas of sulfur hexafluoride high-voltage electrical equipment

Info

Publication number: WO2014113911A1
Application number: PCT/CN2013/070822
Authority: WO
Inventors: 金海勇
Original assignee: Jin Haiyong
Priority date: 2013-01-22
Filing date: 2013-01-22
Publication date: 2014-07-31
Also published as: WO2014114208A1

Abstract

A liquefaction prevention apparatus for a sulfur hexafluoride gas of a sulfur hexafluoride high-voltage electrical equipment, which is connected to a sulfur hexafluoride gas chamber (12) of a high-voltage electrical equipment body (11). The liquefaction prevention apparatus for the sulfur hexafluoride gas comprises a sulfur hexafluoride gas storage tank (1) which is filled with the sulfur hexafluoride gas, a heating apparatus (3) and a connection pipe (2), wherein one end of the connection pipe is hermetically connected to a gas admission port (9) or a dedicated connection port of the high-voltage electrical equipment body, and the other end thereof is connected to a gas outlet of a sulfur hexafluoride gas storage tank, so as to enable the inside of the gas storage tank and the sulfur hexafluoride gas chamber to communicate with each other; and a heat insulation layer (4) is provided outside of the gas storage tank. The liquefaction prevention apparatus for the sulfur hexafluoride gas can prevent the liquefaction or excessive liquefaction of the sulfur hexafluoride gas, thereby guaranteeing the safe operation of the sulfur hexafluoride high-voltage electrical equipment in cold weather.

Description

Specification sulphur hexafluoride gas anti-liquefaction device for sulphur hexafluoride high-voltage electrical equipment

The invention relates to a high-voltage electrical device, in particular to a sulphur hexafluoride gas anti-liquefaction device applied to a high-voltage electrical equipment of sulfur hexafluoride.

Background technique

Due to its excellent insulation and arc extinguishing performance, sulfur hexafluoride gas is an ideal dielectric and arc extinguishing medium for high voltage electrical equipment (especially high voltage circuit breakers) and is widely used at home and abroad. The excellent performance of sulfur hexafluoride gas is achieved under a certain density and pressure. When the temperature drops to a certain level, the sulphur hexafluoride gas inside the high-voltage electrical equipment will appear liquefied, and its liquefaction temperature is related to density and pressure. The higher the density, the higher the liquefaction temperature. Due to the liquefaction of sulfur hexafluoride gas inside the high-voltage electrical equipment, some of the gas becomes liquid, and the density and pressure of the sulfur hexafluoride gas will gradually decrease, which will cause the insulation performance and breaking capacity of high-voltage electrical equipment to drop, seriously affecting Reliable operation of high voltage electrical equipment.

The high-voltage circuit breaker for outdoor use is a large application. It can be used in areas with a latitude higher than 45 degrees. For example, in Xinjiang, Inner Mongolia, Weibei and Northeast China, the winter climate is cold and the outdoor temperature reaches -40 °. C, some areas even reach - 50 °C, sulphur hexafluoride circuit breaker will be liquefied by sulphur hexafluoride gas at this temperature, the gas pressure will drop to the blocking pressure value, and the sulphur hexafluoride circuit breaker will not work properly. Had to quit running, in severe cases, it will cause a large area power outage.

In order to solve the problem of reliable operation of high-voltage electrical equipment of sulfur hexafluoride at ultra-low temperature, relevant manufacturers and research institutes have carried out a large number of analysis and tests on this, and have obtained the following solutions, but they are not ideal, specifically :

1. Mixing gas (sulphur hexafluoride/N ₂ ; sulfur hexafluoride/CF4, etc.) as the arc extinguishing and insulating medium. The disadvantages are: The power supply capacity of the high voltage circuit breaker is only about 80% of the original. , and the manufacturing technology is more demanding and expensive; the proportion mixing method of the mixed gas needs a reasonable ratio, otherwise the insulating property and the arc extinguishing characteristic of the mixed gas will be seriously weakened, and at the same time, because the two high-pressure gases are mixed together, Once the leak rate is different, the gas supplementation process is very complicated, and the technical requirements of the product are not met, which brings a lot of inconvenience to the use, detection and management of the product, and therefore cannot be promoted.

2, 降低 reduce the pressure of sulphur hexafluoride to achieve sulphur hexafluoride gas liquefaction point reduction, but due to gas As the body pressure is reduced, the gas density is also reduced, resulting in a decrease in arc extinguishing performance and insulation performance of the high voltage circuit breaker. Directly affecting the breaking current capability of the high-voltage circuit breaker, it can not meet the requirements of users who need normal breaking capacity, and the product use is greatly limited.

3. The technology of directly heating sulphur hexafluoride gas in high-voltage electrical equipment of sulfur hexafluoride.直接 Direct heating is used to increase the temperature of sulphur hexafluoride gas inside the sulphur hexafluoride high-voltage electrical equipment to prevent liquefaction of sulphur hexafluoride gas. At present, the prior art, the tank type sulphur hexafluoride circuit breaker is in the outside of the tank body (such as the patent ZL200820150430. 1 (CN201242969Y)) or the opening of the tank (such as the patent ZL201020224456. 3 (CN201796803U)) plus The electric heating device is installed. In order to improve the heating efficiency, an insulating layer and a protective layer are added outside the electric heating belt. The disadvantages of this method are: Since the sulfur hexafluoride gas of the tank type SF6 circuit breaker is well sealed in the tank body, it must be heated by heat conduction, the structure is complicated, the heat efficiency is low, and at the same time Direct heating will also accelerate the aging of the seal of the tank sulphur hexafluoride circuit breaker, causing air leakage and serious safety problems. For the porcelain column sulphur hexafluoride circuit breaker, the high voltage switch manufacturer is currently 釆Take the following measures: Install the heater inside or outside the high-voltage circuit breaker sulphur hexafluoride gas, and automatically control it by the intelligent temperature controller. When the ambient temperature drops below a certain temperature, the thermostat turns on the heater. The power supply heats the sulfur hexafluoride gas chamber, so that the sulfur hexafluoride gas chamber temperature is always maintained above a certain temperature. These measures are not ideal for the use of outdoor porcelain column circuit breakers, because if the heater is placed inside the sulphur hexafluoride gas chamber, once the heater is almost impossible to replace, this method is rarely used. . However, if the heater is placed outside the sulphur hexafluoride gas, the current technology, either the heating effect is very poor, or brings other serious problems, such as rapid aging of the sealing ring, causing air leakage problems. For example, the technology used in the patent ZL200610152005. 1 (CN1925084A) is to provide a heating device at the lower end of the pillar porcelain sleeve of each phase porcelain column of the porcelain column sulphur hexafluoride circuit breaker. When the temperature is low, the heater is turned on, due to the porcelain column. The gas of the sulphur hexafluoride circuit breaker is sealed in the porcelain column. The porcelain column is a kind of heat insulating material. In order to achieve the effect, a large heater is selected, so that the porcelain column hexafluoride sulphur is not broken. The sulphur hexafluoride gas is liquefied, but due to the high temperature at the lower end of the pillar porcelain sleeve, the sealing ring at the lower end of the pillar porcelain sleeve is rapidly aged, and the time is short, and the gas is leaked. Also, as the patent ZL200620086633. X (CN2927307Y) is used in the bottom plate of the high-voltage circuit breaker with heating device, ZL201120025943. 1 (CN202013833U), a heating insulation jacket wrapped in the operating mechanism box of the high-voltage circuit breaker and The method of the beam outside the transmission box, because the gas of the sulphur hexafluoride circuit breaker is sealed in the porcelain column, the porcelain column is a heat insulating material, and the heating effect is not good, and the root cannot be rooted. This solves the problem.

The technique of directly heating sulphur hexafluoride gas for high-voltage electrical equipment is simple in principle, but the current technology is difficult to implement because sulphur hexafluoride gas for high-voltage electrical equipment is sealed in high-voltage electrical equipment. In the sulphur hexafluoride gas chamber in the body, the high voltage electrical equipment has a high working voltage, and it is generally difficult to directly heat the sulphur hexafluoride gas chamber. In this way, the heating effect is not very satisfactory, or it brings a serious problem similar to the air leakage caused by the rapid aging of the sealing ring.

In summary, the current sulphur hexafluoride high-voltage electrical equipment runs in cold regions, and there is a problem of liquefaction of sulphur hexafluoride gas, which brings hidden dangers to the safe operation of the power grid. Summary of the invention

In order to solve the above problems in the prior art of high-voltage electrical equipment for sulfur hexafluoride, the object of the present invention is to provide a sulfur hexafluoride gas anti-liquefaction device for high-voltage electrical equipment of sulfur hexafluoride, which has six in an extremely cold region. The advantage that fluorinated sulfur gas will not liquefy plays a huge role in ensuring the safe operation of electricity. The present invention is achieved as follows: a sulfur hexafluoride gas anti-liquefaction device for a high-voltage electrical equipment of sulfur hexafluoride, which is connected to a sulfur hexafluoride gas chamber of a high-voltage electrical equipment body, the sulfur hexafluoride The gas anti-liquefaction device comprises a sulfur hexafluoride gas storage tank filled with sulfur hexafluoride gas and a connecting pipe, one end of the connecting pipe is sealingly connected to an air inlet or a dedicated connecting port of the main body of the high voltage electrical device, and the other end is connected at The gas outlet of the sulphur hexafluoride gas storage tank is connected to the sulphur hexafluoride gas chamber in the gas storage tank.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device, wherein the sulphur hexafluoride gas storage tank is made of steel or a cylinder.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device is further provided with a valve on the connecting pipe or the sulphur hexafluoride gas storage tank.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device further comprises a heating device for heating the gas storage tank.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device, wherein the heating device has an inner and outer temperature sensor and a gas density sensor for monitoring temperature and gas density and ambient temperature in the gas storage tank , heating elements and intelligent control elements.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device, the intelligent control component receiving the inner and outer temperature sensors, the gas density sensor signal and controlling the connection of the heating element and / or valve.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device, wherein the heating element of the heating device is disposed outside the sulphur hexafluoride gas storage tank, and is provided with a heat insulating layer outside.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device, wherein the heating element of the heating device is disposed in a sulphur hexafluoride gas storage tank, and the gas storage tank is provided with a heat insulating layer.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device further comprises a heating element open circuit alarm circuit.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device, the sulphur hexafluoride gas storage tank or the connecting pipe is further provided with a sulphur hexafluoride density relay or a density meter or a pressure switch, The density and pressure of the sulfur hexafluoride gas inside the gas tank are monitored.

The innovation of the invention is: adding a sulphur hexafluoride gas liquefaction device to the conventional sulphur hexafluoride high-voltage electrical equipment, preventing the sulphur hexafluoride gas liquefaction device from being provided with a sulphur hexafluoride gas storage tank, and a heating device . When the ambient temperature of the high-voltage electrical equipment body is low, the heating device starts to heat the gas storage tank, and the sulfur hexafluoride gas in the gas storage tank is heated, and the temperature thereof will rise, and the hexafluoride in the sulfur hexafluoride gas chamber The sulfur gas will form a convection, and the heat will be directly transferred to the sulfur hexafluoride gas chamber, so that the temperature of the sulfur hexafluoride gas in the sulfur hexafluoride gas chamber is raised to prevent liquefaction or liquefaction, that is, the high pressure is always allowed. The temperature of the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber of the electrical equipment is higher than the liquefaction zero boundary temperature, or the density of the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber in the high-voltage electrical equipment body is high. The alarm value of high-voltage electrical equipment ensures the safe operation of high-voltage electrical equipment of sulfur hexafluoride in cold weather. Since the sulphur hexafluoride gas storage tank is connected to the high-voltage electrical equipment through the connecting pipe, the sulfur hexafluoride gas storage tank is welded by the steel, and is connected to the connecting pipe through an elongated connecting joint, all the connections It is far away from the heating element, and the temperature of the sealing ring at the joint is completely within the normal working range, so that the sealing ring will not be aged and gas leakage will not occur. In summary, the core innovation of the present invention is to add a sulphur hexafluoride gas liquefaction device to a conventional sulphur hexafluoride high-voltage electrical device, and to hexafluoride through a heating device on a sulphur hexafluoride gas liquefaction device. The sulfur storage tank is heated, and the sulphur hexafluoride gas in the gas storage tank is heated to increase the temperature, and heat convection is formed with the sulfur hexafluoride gas in the sulfur hexafluoride gas chamber, and the heat is directly transferred. Into the sulfur hexafluoride gas chamber, the temperature of the sulfur hexafluoride gas in the sulfur hexafluoride gas chamber is increased to prevent the sulphur hexafluoride gas in the sulfur hexafluoride gas chamber of the high-voltage electrical equipment from being liquefied or liquefied. Many, to ensure the safe operation of high-voltage electrical equipment of sulfur hexafluoride in cold weather, overcoming the prior art heating device Many problems directly related to the heating of sulphur hexafluoride gas chamber (see background technology for details) have solved the problems that have been existing in power systems for many years: Reliable and safe operation of sulphur hexafluoride high-voltage electrical equipment in cold weather . Through such innovations, the sulphur hexafluoride high-voltage electrical equipment will not be liquefied in the extremely cold regions, ensuring the safe operation of high-voltage electrical equipment for sulfur hexafluoride. The invention can be directly applied to the newly designed sulphur hexafluoride high-voltage electrical equipment, and can also transform the existing sulphur hexafluoride high-voltage electrical equipment that has been operated.

Remarks: The high-voltage electrical equipment for sulphur hexafluoride includes sulphur hexafluoride high-pressure ceramic column circuit breaker, sulphur hexafluoride high-pressure tank circuit breaker, sulphur hexafluoride GIS, sulphur hexafluoride current transformer, hexafluoride Electrical equipment such as sulfur voltage transformers and sulfur hexafluoride transformers. In addition, the sulphur hexafluoride auxiliary gas storage tank can also be welded by other metal materials or sealed by other materials.

DRAWINGS

1 is an outline view of a high-voltage electrical equipment for sulfur hexafluoride according to the present invention;

2 is a schematic view showing the structure of a sulphur hexafluoride gas liquefaction apparatus for a sulphur hexafluoride high-voltage electrical apparatus according to the present invention;

3 is a schematic view showing the control of a heating device for preventing sulphur hexafluoride gas liquefaction apparatus of a sulphur hexafluoride high-voltage electrical apparatus according to the present invention;

Figure 4 is a perspective view showing another high-voltage electrical equipment for sulfur hexafluoride according to the present invention;

Figure 5 is a perspective view showing another high-voltage electrical equipment for sulfur hexafluoride according to the present invention;

6 is a schematic structural view of a sulphur hexafluoride gas liquefaction apparatus of another sulphur hexafluoride high-voltage electrical apparatus of FIG. 5 according to the present invention;

Figure 7 is a schematic view showing the control of a heating device for preventing sulphur hexafluoride gas liquefaction apparatus of another sulphur hexafluoride high-voltage electrical apparatus of Figure 5;

In order to better understand the technical solutions of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings:

Please refer to FIG. 1, FIG. 2, FIG. 3, the first sulphur hexafluoride gas anti-liquefaction device of the first sulphur hexafluoride high-voltage electrical equipment of the present invention, which is connected to the high-voltage electrical equipment body 1 1 and is disposed in the high-voltage electrical equipment body. There is a sulfur hexafluoride gas chamber 12, a density relay 13 and a device for preventing liquefaction of sulfur hexafluoride gas. The device for preventing liquefaction of sulfur hexafluoride gas comprises a sulfur hexafluoride gas storage tank 1, a connecting pipe 2, a heat insulating layer 4, a casing 5, a valve 6, a joint 7, a heat insulating layer 8, and the like. In order to ensure more reliable equipment, a heating device 3 can be added, and the heating device 3 is mainly composed of a heating element 31, a switch 32, a controller 33, a device body temperature sensor 34, an ambient temperature sensor 35, an intelligent control element 36, and a gas density sensor. (pressure sensor) 37 and so on. The sulphur hexafluoride gas storage tank 1 is installed beside the high-voltage electrical equipment, and one end of the connection pipe 2 is sealedly connected to the air supply port 9 or the dedicated connection port of the high-voltage electrical equipment body, and the other end is connected to the air outlet of the valve 6, the valve The air inlet of the 6 is connected to the air outlet of the sulfur hexafluoride gas storage tank 1 and installed on the gas storage tank, and the joint 6 is also connected to the sulfur hexafluoride gas storage tank 1 for use as a gas supplement. The heating element 31 can be mounted on the outside of the sulphur hexafluoride gas storage tank 1, and the outer surface of the heating element 31 is provided with a heat insulating layer 4 having a good heat insulating effect. A sulfur hexafluoride gas storage tank 1, a heating element 31, a switch 32, a controller 33, an intelligent control element 36, a density (pressure) sensor 37, a heat insulating layer 4, a valve 6, a joint, and the like are all mounted in the casing 5. The inner temperature sensor 34 is mounted on the sulphur hexafluoride gas storage tank 1, and the outer temperature sensor 35 is mounted outside the casing 5 to measure the outdoor temperature. After installation, the sulphur hexafluoride gas source is connected to the joint 7, and the sulphur hexafluoride gas storage tank 1 is evacuated, filled with pure nitrogen gas, and then filled with sulfur hexafluoride gas until the sulfur hexafluoride storage The sulphur hexafluoride gas pressure in the gas cylinder 1 reaches the sulphur hexafluoride high pressure electrical equipment requirement or the specified rated pressure.

When the temperature drops very low during the cold season, the valve 6 is opened and the heating device 3 is turned on. When the valve 6 is opened, the sulfur hexafluoride gas of the sulfur hexafluoride gas storage tank 1 communicates with the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body through the air supply port 9. The temperature is detected by the temperature sensor 35. When the atmospheric temperature drops to a preset value, the intelligent control unit 36 activates the controller 33, and the controller 33 turns on the heating element 31, and the heating element 31 stores the sulfur hexafluoride gas. The tank 1 and the internal sulfur hexafluoride gas are heated. Due to the heat preservation effect of the heat insulating layer 4, the temperature of the sulfur hexafluoride gas inside the sulfur hexafluoride gas storage tank 1 is quickly increased, and the temperature is higher than that of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body. When the temperature of the sulfur hexafluoride gas is such that there is a temperature difference between the two sulfur hexafluoride gases. Because the different temperatures of the two sulphur hexafluoride gases cause a difference in density between the sulphur hexafluoride gas storage tank and the plenum, causing convection. Convective conduction, because it involves the dynamic process, is faster than direct conduction, and can quickly transfer heat, with high efficiency and good effect. In this way, the sulfur hexafluoride gas of the gas storage tank 1 and the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 are circulated, causing heat convection, and the heat is quickly transmitted directly to the sulfur hexafluoride gas chamber 12, so that six The temperature of the sulphur hexafluoride gas in the fluorinated sulfur gas chamber 12 is increased, and the pressure rises synchronously, thereby preventing liquefaction or liquefaction too much, that is, always letting the sulphur hexafluoride gas chamber 12 of the high-voltage electrical equipment body The temperature of the sulfur fluoride gas is higher than the liquefaction critical temperature, or the density of the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is higher than that of the high-voltage electrical equipment to ensure the sulfur hexafluoride High-voltage electrical equipment operates safely in cold weather. When the atmospheric temperature rises to another predetermined value, the intelligent control unit 36 turns off the controller 33, the controller 33 turns off the heating element 31, and the heating element 31 stops to the sulphur hexafluoride gas storage tank 1 and the inside. The sulphur hexafluoride gas is heated to save energy and extend the life of the heating element. At the same time, in order to ensure the reliable operation of the system, the heating device is also provided with a heating element open circuit alarm function, that is, when the heating element is broken due to the service life or damage, the intelligent control element 36 will issue an alarm signal to notify the staff to deal with it in time to ensure Reliable work.

The invention can also detect the atmospheric environment temperature, the temperature of the sulfur hexafluoride gas inside the sulfur hexafluoride storage tank 1, and the high pressure by the action of the internal temperature sensor 34, the external temperature sensor 35, the intelligent control element 36, and the pressure sensor 37. The pressure and density of sulfur hexafluoride gas in the sulphur hexafluoride gas chamber 12 in the electrical equipment body, and indirectly the temperature of the sulfur hexafluoride gas chamber 12 and hexafluoride according to the pressure and temperature characteristics of the sulfur hexafluoride gas The operation requirements of the sulfur high-voltage electrical equipment, the intelligent automatic control of the controller 33 and the heating element 31 by the intelligent control component 36, the high temperature of the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is realized. At its liquefaction critical temperature, high-voltage electrical equipment for sulphur hexafluoride is guaranteed to operate safely at extremely cold temperatures while ensuring energy savings.

In the non-cold season, the valve 6 is closed, and the sulfur hexafluoride gas of the sulfur hexafluoride gas storage tank 1 is not in communication with the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body. At the same time, the switch 32 of the heating device 3 is cut off, so that the heating element 31 does not work. At this time, because of the non-cold season, the sulfur hexafluoride gas in the sulfur hexafluoride high-voltage electrical equipment is not liquefied, and the sulfur hexafluoride high-voltage electrical The device works safely.

For newly manufactured sulphur hexafluoride high-voltage electrical equipment, the sulphur hexafluoride storage tank can be directly connected to the sulphur hexafluoride gas chamber. The sulphur hexafluoride gas liquefaction device can be directly disposed on the body of the sulphur hexafluoride high-pressure electrical equipment, even if the sulphur hexafluoride gas liquefaction device is prevented from being integrated with the sulphur hexafluoride high-voltage electrical equipment. For example, the sulphur hexafluoride gas liquefaction device can be directly disposed on the mechanism box 14 of the sulfur hexafluoride high voltage circuit breaker or on the beam, as shown in FIG.

Referring to FIG. 5, FIG. 6, and FIG. 7, a second embodiment of the sulphur hexafluoride high-voltage electrical apparatus of the present invention includes a high-voltage electrical equipment body 1 1 and a sulfur hexafluoride gas chamber disposed in the high-voltage electrical equipment body. 12. Density relay 1 3. Prevent sulphur hexafluoride gas liquefaction device. Preventing sulphur hexafluoride gas liquefaction device including The sulphur hexafluoride gas storage tank 1, the connecting pipe 2, the heating device 3, the heat insulating layer 4, the casing 5, the valve 61, the valve 62, the joint 7, the heat insulating layer 8, the density relay 10, and the like are composed. The heating device 3 is mainly composed of a heating element 31, a switch 32, an automatic thermostat controller 38, and the like.

When the temperature drops very low during the cold season, open valve 61 and valve 62 to turn on heating unit 3. When the valve 61 and the valve 62 are opened, the sulfur hexafluoride gas of the sulfur hexafluoride gas storage tank 1 is connected to the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body. The atmospheric temperature is detected by the temperature sensor 381 of the automatic thermostat controller 38. When the atmospheric temperature drops to a predetermined value, the automatic thermostat controller 38 activates the controller 33, and the controller 33 turns on the heating element 31, and the heating element 31 starts. The sulphur hexafluoride gas storage tank 1 and the internal sulfur hexafluoride gas are heated. The sulfur hexafluoride gas of the gas storage tank 1 and the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 are circulated, causing heat convection, and the heat is directly transmitted to the sulfur hexafluoride gas chamber 12 to make the hexafluoride When the temperature of the sulfur hexafluoride gas in the sulfur gas chamber 12 is raised, the liquefaction or liquefaction can be prevented from being excessive, that is, the temperature of the sulfur hexafluoride gas in the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is always high. At the liquefaction critical temperature, or to ensure that the density of sulfur hexafluoride gas in the sulphur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is higher than that of the high-voltage electrical equipment, to ensure that the high-voltage electrical equipment of sulfur hexafluoride is in cold weather Safe to run. When the atmospheric temperature rises to another predetermined value, the automatic thermostat controller 38 turns off the controller 33, the controller 33 turns off the heating element 31, and the heating element 31 stops the sulphur hexafluoride gas storage tank 1 and The internal sulphur hexafluoride gas is heated to save energy and extend the life of the heating element. At the same time, in order to ensure the reliable operation of the system, the heating device is also provided with a heating element open circuit alarm function, that is, when the heating element is broken due to the service life or damage, the automatic thermostat controller 38 will send an alarm signal to notify the staff to deal with it in time. Guarantee reliable work.

In summary, the present invention employs a liquefaction device for preventing sulfur hexafluoride gas from being installed on a conventional high-voltage electrical equipment for sulfur hexafluoride. The sulphur hexafluoride gas liquefaction device is provided with a sulphur hexafluoride gas storage tank, and a heating device for heating the gas of the sulphur hexafluoride gas storage tank by the heating device to form convection. Through the convection heat transfer method, the heat is quickly transferred to the sulphur hexafluoride gas chamber in the high-voltage electrical equipment to prevent liquefaction or excessive liquefaction of sulphur hexafluoride gas, ensuring reliable operation of high-voltage electrical equipment in cold weather. Since the sulphur hexafluoride gas storage tank is connected to the high-voltage electrical equipment through the connecting pipe, the sulfur hexafluoride gas storage tank is welded by the steel, and is connected to the connecting pipe through an elongated connecting joint, all the connections It is far away from the heating element, and the temperature of the sealing ring at the joint is completely within the normal working range, so that the sealing ring will not be Aging, no gas leakage will occur. In summary, the core innovation of the present invention is to install a sulphur hexafluoride gas liquefaction device on a conventional high-voltage electrical equipment for sulfur hexafluoride. The sulphur hexafluoride gas storage tank is heated by a heating device on the sulphur hexafluoride gas liquefaction device, and the sulphur hexafluoride gas in the gas storage tank is first heated to raise the temperature thereof, and sulfur hexafluoride gas The sulphur hexafluoride gas in the chamber forms a heat convection, and the heat is directly transferred to the sulphur hexafluoride gas chamber, so that the temperature of the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber is raised to prevent the high voltage electrical equipment from being inside the body. The sulphur hexafluoride gas in the sulphur hexafluoride gas chamber is liquefied or liquefied too much to ensure the safe operation of the sulphur hexafluoride high-voltage electrical equipment in cold weather, and overcomes the prior art heating device directly heating the sulphur hexafluoride gas chamber Many problems (see the background technology for details) have solved the problems that have been existing in the power system for many years: The reliable and safe operation of sulfur hexafluoride high-voltage electrical equipment in cold weather. Imagine that if there is no innovation in installing sulphur hexafluoride gas storage tanks on traditional sulphur hexafluoride high-voltage electrical equipment, heat transfer through heat convection cannot be realized, and heat can be quickly and efficiently transferred to sulphur hexafluoride gas. room. Therefore, through such innovation, the sulphur hexafluoride high-voltage electrical equipment will not liquefy the sulphur hexafluoride gas in the extremely cold regions, and will not reduce the service life of the sulphur hexafluoride high-voltage electrical equipment, ensuring hexafluoride. Sulphur high voltage electrical equipment operates safely. In particular, the present invention can be directly applied to newly designed sulphur hexafluoride high-voltage electrical equipment, and can also be retrofitted to existing sulphur hexafluoride high-voltage electrical equipment.

It should be understood by those skilled in the art that the above embodiments are only used to illustrate the invention, and are not intended to limit the present invention as long as it is within the spirit of the invention. Variations and modifications of the examples are intended to fall within the scope of the appended claims.

Claims

Rights request

A sulfur hexafluoride gas anti-liquefaction device for a high-voltage electrical equipment of sulfur hexafluoride, which is connected to a sulfur hexafluoride gas chamber of a high-voltage electric equipment body, characterized in that: the sulfur hexafluoride gas The anti-liquefaction device comprises a sulfur hexafluoride gas storage tank filled with sulfur hexafluoride gas and a connecting pipe, one end of the connecting pipe is sealingly connected to the air inlet or the special connecting port of the main body of the high voltage electrical device, and the other end is connected to the sixth The gas outlet of the fluorinated sulfur storage tank is connected to the sulphur hexafluoride gas chamber in the gas storage tank.

The sulphur hexafluoride gas anti-liquefaction device for a sulphur hexafluoride high-voltage electrical apparatus according to claim 1, wherein the sulphur hexafluoride gas storage tank is made of steel or a steel cylinder.

The sulphur hexafluoride gas anti-liquefaction device for a sulphur hexafluoride high-voltage electrical device according to claim 1, wherein: the connecting pipe or the sulphur hexafluoride gas storage tank is further provided with a valve.

A sulphur hexafluoride gas liquefaction prevention apparatus for a sulphur hexafluoride high-voltage electrical apparatus according to claim 1, further comprising: a heating means for heating said gas storage tank.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device according to claim 4, wherein: the heating device has a temperature and a gas density and an ambient temperature in the gas storage tank. Internal and external temperature sensors, gas density sensors, heating elements and intelligent control elements.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device according to claim 5, wherein the intelligent control element receives and controls the inner and outer temperature sensors and the gas density sensor signals The heating element and/or valve are connected.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device according to claim 4, wherein: the heating element of the heating device is disposed outside the sulphur hexafluoride gas storage tank, There is a thermal insulation layer outside.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device according to claim 4, wherein: the heating element of the heating device is disposed in a sulphur hexafluoride gas storage tank, A heat insulating layer is arranged outside the gas storage tank.

The sulfur hexafluoride gas anti-liquefaction apparatus for a sulfur hexafluoride high-voltage electrical apparatus according to claim 5, wherein the heating device further comprises a heating element disconnection alarm circuit.

The sulphur hexafluoride gas anti-liquefaction device of the sulphur hexafluoride high-voltage electrical device according to claim 1 or 5, wherein: the sulphur hexafluoride gas storage tank or the connecting pipe is further provided with Sulfur hexafluoride A relay or density meter or pressure switch monitors the density and pressure of sulfur hexafluoride gas inside the gas tank.

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