WO2014113913A1

WO2014113913A1 - Method for preventing sulfur hexafluoride gas liquefaction of high-voltage electrical equipment

Info

Publication number: WO2014113913A1
Application number: PCT/CN2013/070824
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: WO2014114210A1

Abstract

A method for preventing sulfur hexafluoride gas liquefaction of a high-voltage electrical equipment. A sulfur hexafluoride auxiliary gas storage tank (1), a heating apparatus (3) and a connection pipe (2) are provided on the high-voltage electrical equipment, and a sulfur hexafluoride gas chamber (12) of the high-voltage electrical equipment is in communication with the sulfur hexafluoride auxiliary gas storage tank through the connection pipe. By way of detecting the ambient temperature, the gas temperature and the gas density, when the reduction of the ambient temperature of a high-voltage electrical equipment body makes the sulfur hexafluoride gas liquefaction likely, the heating apparatus begins to heat a sulfur hexafluoride auxiliary gas storage tank, and then the temperature of the gas inside the auxiliary gas storage tank rises, so that a temperature difference is produced between the gas inside the auxiliary gas storage tank and the sulfur hexafluoride gas inside the sulfur hexafluoride gas chamber and then heat convection is formed, and heat is quickly transferred directly to the sulfur hexafluoride gas chamber of the sulfur hexafluoride high-voltage electrical equipment. Thus the temperature of the sulfur hexafluoride gas inside the sulfur hexafluoride gas chamber is increased; the liquefaction or excessive liquefaction of the gas is prevented; and the safe operation of the high-voltage electrical equipment is guaranteed.

Description

Method for preventing liquefaction of sulfur hexafluoride gas in high-voltage electrical equipment

The present invention relates to a method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus, and more particularly to a method for preventing liquefaction of sulphur hexafluoride gas in a high-voltage electrical equipment of a high-voltage electrical equipment for sulfur hexafluoride used in a cold region. Background technique

Due to its excellent insulation and arc extinguishing performance, sulfur hexafluoride gas is an ideal insulation and arc extinguishing medium for high voltage electrical equipment, especially high voltage circuit breakers, which are 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. The liquefaction temperature is related to the density and pressure. The larger the liquefaction temperature, the higher. 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. For example, outdoor high-voltage circuit breakers have a wide range of applications. For example, in Xinjiang, Inner Mongolia, and northeastern China, the winter climate is cold, the outdoor temperature reaches -40 °C, and some areas even reach -50 °C. At this temperature, the sulphur hexafluoride gas is liquefied, the gas pressure is reduced to the blocking pressure value, and the sulphur hexafluoride circuit breaker cannot work normally, and has to be withdrawn from operation. In severe cases, large-scale power outages may occur.

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. The mixed gas (sulphur hexafluoride/N ₂ ; sulfur hexafluoride/CF4, etc.) is used 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 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, if it leaks, but due to the mixing of the two high-pressure gases Together, the leakage rate is different, the gas replenishing 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. The sulphur hexafluoride gas pressure is reduced to reduce the liquefaction point of the sulphur hexafluoride gas. However, as the gas pressure is lowered, 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 outside the beam of the transmission box, due to the disconnection of sulfur hexafluoride The gas of the device is sealed in the porcelain column. The porcelain column is a kind of heat insulating material, and the heating effect is not good, and the problem cannot be solved fundamentally.

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 voltage of the high-voltage electrical equipment is high, 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 high-voltage electrical equipment for sulphur hexafluoride has a problem of liquefaction of sulphur hexafluoride gas in cold regions, and there is no good solution to bring hidden dangers to the safe operation of the 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 method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical equipment in a cold region, and to realize high-voltage electrical equipment in an extremely cold region. Its sulphur hexafluoride gas will not be liquefied, which plays a huge role in ensuring the safe operation of electricity.

The present invention is achieved by: a method for preventing liquefaction of sulfur hexafluoride gas in a high voltage electrical apparatus, comprising: a body of a high voltage electrical device; a sulfur hexafluoride gas chamber disposed in the body of the high voltage electrical device; a density relay, said hexafluoride The sulfur chamber is filled with sulfur hexafluoride gas, and it also includes:

Step one, using a steel cylinder as a sulphur hexafluoride auxiliary gas storage tank or welding a sealed sulphur hexafluoride auxiliary gas storage tank with steel, the sulphur hexafluoride auxiliary gas storage tank is filled with sulfur hexafluoride gas, and The auxiliary gas storage tank is connected to the sulfur hexafluoride gas chamber through a valve and a connecting pipe;

Step 2: monitoring the temperature and/or pressure of the sulfur hexafluoride gas chamber and/or the gas storage tank and the ambient temperature, and heating the sulfur hexafluoride auxiliary when one of the at least three is lower than a preset value Gas storage tank

Step 3: When the temperature of the sulphur hexafluoride auxiliary gas storage tank rises, the sulphur hexafluoride gas in the sulphur hexafluoride auxiliary gas storage tank transfers the heat to the high-voltage electrical equipment body by means of heat convection. a sulfur hexafluoride gas chamber to increase the temperature and pressure in the sulfur hexafluoride gas chamber;

Step 4: When the temperature and/or pressure of the sulfur hexafluoride gas chamber is monitored to reach the specified rating, the heating of the sulfur hexafluoride auxiliary gas storage tank is stopped.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, the sulfur hexafluoride assist The gas storage tank is disposed with the heating device and has a heat insulating layer on the outside.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, wherein the connecting pipe or the sulphur hexafluoride auxiliary gas storage tank is further provided with a plurality of valves.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, wherein the connecting pipe is provided with a heat insulating layer on the outside.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, the second step is a heating device consisting of a heating element, a switch, a controller, an internal and external temperature sensor, a pressure sensor, and an intelligent control component. The fluorinated sulfur assisted gas storage tank is heated.

The method for preventing liquefaction of sulfur hexafluoride gas in a high voltage electrical device, wherein the heating device is further provided with an automatic constant temperature control circuit.

The method for preventing liquefaction of sulfur hexafluoride gas in a high voltage electrical device, wherein the heating device further has a heating element open circuit alarm circuit.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, wherein the sulfur hexafluoride auxiliary gas storage tank is further connected with a gas supply port.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, wherein the connecting pipe or the sulphur hexafluoride auxiliary gas storage tank is further provided with a sulphur hexafluoride density relay.

The invention discloses a method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, and the innovation thereof is: adding or installing a sulfur hexafluoride auxiliary gas storage tank on a conventional high-voltage electrical equipment of sulfur hexafluoride, and heating Device. The sulphur hexafluoride is heated by the heating device to assist the gas in the gas storage tank to form a convection, and the heat is transferred to the sulphur hexafluoride gas chamber in the high-voltage electrical equipment through the convection heat transfer mode. Prevent liquefaction or excessive liquefaction of sulphur hexafluoride gas to ensure reliable operation of high voltage electrical equipment in cold weather. Since the sulfur hexafluoride auxiliary gas storage tank is connected to the high-voltage electrical equipment through the connecting pipe, the sulfur hexafluoride auxiliary gas storage tank is welded by the steel, and is connected to the connecting pipe through an elongated connecting joint. All joints are far from the heating element, and the temperature of the seal at the joint is completely within the normal working range, so that the seal does not age and gas leakage does not occur. In summary, the core innovation of the present invention is to install a sulfur hexafluoride gas storage tank and a heating device on a conventional high-voltage electrical equipment for sulfur hexafluoride. The sulphur hexafluoride gas storage tank is heated by a heating device, and the sulphur hexafluoride gas in the gas storage tank is heated to increase the temperature, and the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber is formed into heat convection. , quickly transfer heat directly 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 high-voltage electrical equipment 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 to the hexafluoride Many problems of sulfur gas chamber heating (see the background technology for details) have solved the problems that have been existing in power systems for many years: The reliable and safe operation of sulfur hexafluoride high-voltage electrical equipment in cold weather. Through such innovation, the sulphur hexafluoride auxiliary gas storage tank can be specially designed, it is easy to heat, and it is easy to keep warm, and its heating effect is good and high efficiency; the heat transfer method by convection of sulfur hexafluoride gas can quickly heat up Efficient transfer to the sulphur hexafluoride chamber in high voltage electrical equipment. The sulphur hexafluoride high-voltage electrical equipment will not liquefy the sulphur hexafluoride gas in the extremely cold area, ensuring the safe operation of the sulphur hexafluoride high-voltage electrical equipment. 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 of sulphur hexafluoride includes sulphur hexafluoride high-pressure ceramic column circuit breaker, sulphur hexafluoride high-pressure tank circuit breaker, sulphur hexafluoride GI S, sulphur hexafluoride current transformer, six Electrical equipment such as sulfur fluoride 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 sulphur hexafluoride high-voltage electrical device in a method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device according to the present invention;

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

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

4 is a perspective view showing another high-voltage electrical equipment for sulfur hexafluoride in a method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to the present invention;

5 is a perspective view showing another high-voltage electrical equipment for sulfur hexafluoride in a method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to the present invention;

6 is a schematic view showing the structure of a sulphur hexafluoride gas liquefaction apparatus according to another method for preventing liquefaction of sulfur hexafluoride gas in the high voltage electrical apparatus of FIG. 5;

FIG. 7 is a schematic diagram of control of a heating device for preventing sulphur hexafluoride gas liquefaction apparatus according to another method for preventing liquefaction of sulfur hexafluoride gas in a high voltage electrical apparatus of FIG. 5; In order to better understand the technical method of the present invention, the present invention will be described in detail below through specific embodiments and with reference to the accompanying drawings:

The invention discloses a method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, comprising: a body of a high-voltage electrical device, a sulfur hexafluoride gas chamber disposed in the body of the high-voltage electrical device, a density relay, and the sulfur hexafluoride gas chamber charging There is sulfur hexafluoride gas, which also includes:

Step one, using a steel cylinder as a sulphur hexafluoride auxiliary gas storage tank or welding a sealed sulphur hexafluoride auxiliary gas storage tank with steel, the sulphur hexafluoride auxiliary gas storage tank is filled with sulfur hexafluoride gas, and The auxiliary gas storage tank communicates with the sulfur hexafluoride gas chamber through a valve and a connecting pipe;

Step 2: monitoring the temperature and pressure of the sulfur hexafluoride gas chamber and/or the gas storage tank and the ambient temperature, and heating the sulfur hexafluoride auxiliary gas storage when one of the at least three is lower than a preset value Can

Step 4: When the temperature and pressure of the sulfur hexafluoride gas chamber are monitored to reach the specified rated value, the heating of the sulfur hexafluoride auxiliary gas storage tank is stopped.

Please refer to FIG. 1, FIG. 2, FIG. 3, an embodiment of a first method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device according to the present invention. The specific measure is to prevent liquefaction of sulfur hexafluoride gas on the high-voltage electrical equipment. The device, the sulphur hexafluoride gas liquefaction device comprises a sulphur hexafluoride auxiliary gas storage tank 1, a connecting pipe 2, a heating device 3, a heat insulating layer 4, a casing 5, a valve 6, a joint 7, a heat insulating layer 8, and the like. The heating device 3 is mainly composed of a heating element 31, a switch 32, a controller 33, a temperature sensor 34, a temperature sensor 35, an intelligent control element 36, a pressure sensor 37, and the like. The sulfur hexafluoride auxiliary gas storage tank 1 is installed beside the high-voltage electrical equipment, one end of the connecting pipe 2 is sealingly connected to the air supply port 9 or the special connection port of the high-voltage electrical equipment body, and the other end is connected to the air outlet of the valve 6, The air inlet of the valve 6 is connected to the sulphur hexafluoride auxiliary gas storage tank 1, and the sulphur hexafluoride auxiliary gas storage tank 1 is also connected with a joint 7 for use as a gas supplement. The outer portion of the sulphur hexafluoride auxiliary gas storage tank 1 is provided with a heating element 31, 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 auxiliary gas storage tank 1, a heating element 31, a switch 32, a controller 33, an intelligent control element 36, a pressure sensor 37, a heat insulating layer 4, a valve 6, a joint, and the like are all mounted in the casing 5. The temperature sensor 34 is mounted on the sulfur hexafluoride auxiliary gas storage tank 1, and the temperature sensor 35 is mounted outside the casing 5 to measure the outdoor temperature. After installation, put hexafluoride The sulfur-enhanced gas-filling device is connected with the joint ,, and the sulphur hexafluoride auxiliary gas storage tank 1 is evacuated, filled with high-purity nitrogen gas, and then filled with sulfur hexafluoride gas, until the hexafluoride sulphur-assisted gas storage tank 1 is hexafluoride. The sulfur gas is charged to the rated pressure of the sulfur hexafluoride high-voltage electrical equipment.

When the temperature drops very low during the cold season, open the valve 6 and turn on the heating unit 3. When the valve 6 is opened, the sulfur hexafluoride gas of the sulfur hexafluoride auxiliary 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 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 starts to supply the sulfur hexafluoride auxiliary storage. The gas 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 auxiliary gas storage tank 1 is rapidly increased, and the hexafluoride of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body The temperature of the sulfur gas is very low, and 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 of the system, causing convection. Convective conduction is faster than direct conduction because it involves the dynamic process, so the heat transfer rate is fast, the efficiency is high, and the effect is good. Thus, the sulfur hexafluoride gas of the auxiliary 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 conducted to the sulfur hexafluoride gas chamber 12 so that the heat is directly conducted. The temperature of the sulfur hexafluoride gas in the sulfur hexafluoride gas chamber 12 is increased to prevent liquefaction or liquefaction, that is, the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is always allowed. The temperature is higher than the liquefaction critical temperature, or the density of sulphur 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, ensuring that the sulphur hexafluoride high-voltage electrical equipment is Safe operation 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 supplying the sulfur hexafluoride auxiliary 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 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 sulfur hexafluoride assisted gas sulphur hexafluoride gas inside the gas storage tank 1 by the action of the temperature sensor 34, the temperature sensor 35, the intelligent control element 36, and the pressure sensor 37, and the high voltage electric The pressure density of sulfur hexafluoride gas in the sulphur hexafluoride gas chamber 12 in the equipment body, and then according to the pressure and temperature characteristics of sulfur hexafluoride gas, and the high-pressure electrical equipment of sulfur hexafluoride The intelligent control component 36 realizes intelligent automatic control of the controller 33 and the heating component 31, and realizes that the temperature of the sulfur hexafluoride gas of the sulfur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is higher than the liquefaction critical temperature. , to ensure high-voltage electrical equipment of sulfur hexafluoride safe operation under extreme cold temperature, while ensuring energy conservation.

In the non-cold season, the valve 6 is closed, and the sulfur hexafluoride gas of the sulfur hexafluoride auxiliary 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, its sulphur hexafluoride auxiliary gas 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-voltage 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 placed on the mechanism box 14 of the sulphur hexafluoride high voltage circuit breaker or on the beam as shown in FIG.

Referring to FIG. 5, FIG. 6, and FIG. 7, an embodiment of a second method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device according to the present invention is specifically provided for preventing liquefaction of sulfur hexafluoride gas on a high-voltage electrical device. The device, the sulphur hexafluoride gas liquefaction device comprises a sulphur hexafluoride auxiliary gas storage tank 1, a connecting pipe 2, a heating device 3, a heat insulating layer 4, a casing 5, a valve 61, a valve 62, a joint 7, a heat insulating layer 8, The density relay is composed of 10 and so on. The heating device 3 is mainly composed of a heating element 31, a switch 32, an automatic thermostat controller 38, and the like.

In the cold season, when the temperature drops very low, the valve 61 and the valve 62 are opened to open the heating device 3. When the valve 6 1 and the valve 62 are opened, the sulfur hexafluoride gas of the sulfur hexafluoride auxiliary gas storage tank 1 is in communication with 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 preset 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 auxiliary gas storage tank 1 and the internal sulfur hexafluoride gas are heated. The sulfur hexafluoride gas of the auxiliary 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 chamber 12 is raised, the liquefaction or liquefaction can be prevented from being excessive, that is, the high voltage is always allowed. The temperature of the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber 12 in the gas device is higher than the liquefaction critical temperature, or the density of the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber 12 in the high-voltage electrical equipment body is ensured. Higher than the alarm value of high-voltage electrical equipment, to ensure the safe operation of high-voltage electrical equipment of sulfur hexafluoride in cold weather. 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 to supply the sulfur hexafluoride auxiliary gas storage tank 1 And internal sulphur hexafluoride gas heating, saving energy, while extending 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 auxiliary gas storage tank, and a heating device for heating the sulphur hexafluoride auxiliary 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 sulfur hexafluoride auxiliary gas storage tank is connected to the high-voltage electrical equipment through the connecting pipe, the sulfur hexafluoride auxiliary gas storage tank is welded by the steel, and is connected to the connecting pipe through an elongated connecting joint. All joints are far from the heating element, and the temperature of the seal at the joint is completely within the normal working range, so that the seal does not age and gas leakage does not occur. In summary, the core innovation of the present invention is a method of installing a sulfur hexafluoride gas storage tank and a heating device on a conventional high-voltage electrical equipment for sulfur hexafluoride. The sulphur hexafluoride gas storage tank is heated by a heating device, and the sulphur hexafluoride gas in the gas storage tank is heated to increase the temperature, and the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber is formed into heat convection. Quickly transfer heat directly to the sulphur hexafluoride gas chamber to increase the temperature of the sulphur hexafluoride gas in the sulphur hexafluoride gas chamber to prevent hexafluoride in the sulphur hexafluoride gas chamber in the high-voltage electrical equipment Sulfur gas liquefaction or liquefaction too much, to ensure the safe operation of high-pressure sulphur hexafluoride electrical equipment in cold weather, to overcome the problems of the prior art heating device directly heating the sulphur hexafluoride gas chamber (see background) It has 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 innovations, (1) assisted by sulfur hexafluoride The gas storage tank can be specially designed, it is very easy to heat, and it is easy to keep warm, and its heating effect is good and the efficiency is high;

(2) The heat transfer method of convection of sulphur hexafluoride gas can quickly and efficiently transfer heat to the sulphur hexafluoride gas chamber in high-voltage electrical equipment. Overcoming the difficulties of heating in the prior art, poor heating effect, low heating efficiency, easy aging of the sealing ring, and easy air leakage. By this method, the sulphur hexafluoride high-voltage electrical equipment will not be liquefied in the extremely cold region, ensuring the safe operation of the sulphur hexafluoride high-voltage electrical equipment. 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 method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device, comprising: a body of a high-voltage electrical device; a sulfur hexafluoride gas chamber disposed in the body of the high-voltage electrical device; a density relay, said sulfur hexafluoride gas chamber charging There is a sulfur hexafluoride gas, which is characterized in that it also includes:

Step 4: When the temperature and/or pressure of the sulfur hexafluoride gas chamber is monitored to reach the specified required value, the heating of the sulfur hexafluoride auxiliary gas storage tank is stopped.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to claim 1, wherein: said sulfur hexafluoride auxiliary gas storage tank is disposed together with a heating device, and a heat insulating layer is disposed outside .

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to claim 1, wherein: the connecting pipe or the sulfur hexafluoride auxiliary gas storage tank is further provided with a plurality of valves.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to claim 1, wherein the outer surface of the connecting pipe is provided with a heat insulating layer.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device according to claim 1 or 2, wherein: the second step is: a heating element, a switch, a controller, an inner and outer temperature sensor, The heating device composed of the pressure sensor and the intelligent control component performs the heat of the sulfur hexafluoride auxiliary gas storage tank.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to claim 5, wherein: said heating means is further provided with an automatic constant temperature control circuit.

7. The method for preventing liquefaction of sulfur hexafluoride gas in a high voltage electrical apparatus according to claim 1 or 6. The method is characterized in that: the heating device further has a heating element open circuit alarm circuit.

The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical apparatus according to claim 1, wherein: said sulfur hexafluoride auxiliary gas storage tank is further connected with a gas supply port.

9 . The method for preventing liquefaction of sulfur hexafluoride gas in a high-voltage electrical device according to claim 1 , wherein: the connecting pipe or the sulfur hexafluoride auxiliary gas storage tank is further provided with a sulfur hexafluoride density relay .