Gas insulated power equipment, and method for controlling internal pressure of power equipment

Abstract

The present invention relates to gas insulated power equipment filled with insulating gas as an insulating medium, and a method capable of safely operating gas insulated power equipment by controlling the internal pressure of the gas insulated power equipment. The gas insulated power equipment according to the present invention comprises: a housing in which a device for the power equipment is accommodated and insulating gas is sealed; and an extinguishing unit which is coupled to the housing, and which, in an abnormal state in which the internal pressure of the housing abnormally rises, adjusts a composition ratio of the insulating gas discharged from the housing before discharging insulating gas to the outside, and then discharges same to the outside.

Description

Gas-insulated power equipment and power equipment withstand pressure control method

[0001] The present invention relates to a gas-insulated power device in which insulating gas is filled as an insulating medium, and a method for safely operating the gas-insulated power device by controlling its internal pressure.

[0002] Power equipment is a collective term for all devices used to generate, transmit, distribute, convert, and consume power as components of a power system. Specifically, it includes transformers, which are devices that convert the voltage of power; circuit breakers, which are devices that automatically cut off a circuit by detecting overcurrents or short circuits in a power circuit; and gas-insulated switchgear (GIS), which is a device that performs the task of cutting off the current when a fault current occurs.

[0003] The devices constituting the power equipment are housed in a metal tank, and the metal tank containing the power equipment devices is filled with insulating gas and sealed.

[0004] For example, in a gas-insulated switchgear, circuit breakers, disconnectors, grounding switches, current transformers, and busbars are housed in a grounded metal tank; when an abnormal current is detected within the metal tank during operation, the circuit breaker operates to interrupt the line, and the arc generated at this time is extinguished by the insulating gas filling the metal tank.

[0005] In this way, by filling the metal tank with insulating gas, the parts through which high-voltage current flows are insulated, and electrical discharge and arc generation are suppressed, enabling power equipment to operate safely even at high voltages.

[0006] Meanwhile, during the process in which the insulating gas controls the arc, significant arc energy is generated, resulting in high heat. Due to this high heat, the insulating gas inside the metal tank expands, causing the internal pressure to rise rapidly. In particular, if a fault current occurs, such as a short circuit or ground fault, the temperature and pressure inside the metal tank rise sharply, leading to an internal fire, as well as explosions and scattering of debris.

[0007] In order to prevent accidents caused by explosions, gas-insulated power equipment filled with insulating gas may be equipped with a rupture disk as a method to relieve the internal pressure of the power equipment that has risen due to fault currents such as short circuits or failures.

[0008] A pressure relief valve is a type of protective device that can replace a safety valve and consists of a thin rupture disc. It is designed to rupture when the pressure at the inlet of the rupture disc reaches a critical pressure, thereby relieving the internal pressure of the power equipment by releasing the insulating gas inside into the atmosphere.

[0009] Although the explosion of the metal tank can be prevented by providing a pressure relief valve, the risk of secondary accidents, such as serious injury to workers or pedestrians staying near the gas-insulated power equipment or serious damage to surrounding facilities, cannot be prevented as high-temperature, high-pressure arc and insulating gas are rapidly released to the outside through the pressure relief valve.

[0010] In addition, the most widely used insulating gas in the past is sulfur hexafluoride (SF6). Although SF6 possesses excellent insulating properties and arc extinguishing capabilities, it has a significant impact on global warming; therefore, it is necessary to consider the environmental pollution effects of insulating gas emissions. The Global Warming Potential (GWP) of SF6 gas is 24,300, which is the highest GWP among all existing types of gases.

[0011] The European Union’s fluorinated gas regulations, proposed in March 2024, clearly enforce regulations on products, equipment, and parts that use or rely on fluorinated gases such as SF6. According to these regulations, in order to use fluorinated gases as an insulating medium in switchgear, it is specified that for transmission-grade switchgear of 52 kV or higher, fluorinated gases with a GWP of less than 1 must be used.

[0012] That is, an insulating gas desirable for use in power equipment must have a GWP of less than 1, an ozone depletion potential of 0, a boiling point of -20°C or lower, a dielectric strength of 80% or more of that of SF6, a median lethal concentration (low toxicity) of 5,000 ppm or more, be non-genetically modified, and be a non-flammable gas.

[0013] The 6th Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), published by the United Nations Framework Convention on Climate Change (UNFCCC), reports the remaining lifetime, radiative forcing, and GWP of 249 types of fluorine compounds. Among the gases reported in this report, about 47 types meet the criteria for ozone depletion potential, boiling point, and GWP that are desirable for use in electrical equipment; about 75% of these are flammable gases, and the remainder are gases whose flammability has not yet been determined.

[0014] An important factor determining GWP is the atmospheric lifetime of a gas when exposed to the atmosphere; most gases with a GWP of less than 1 have an atmospheric lifetime of less than 20 days. In other words, a low GWP implies high reactivity, and flammability is mainly observed in highly reactive substances.

[0015] Therefore, since insulating gases with a GWP of less than 1 are likely to be highly flammable, a new design concept must be introduced to apply highly flammable insulating gases to existing power equipment designed based on the non-flammable gas SF6.

[0016] Accordingly, the present invention aims to solve the aforementioned problems and to provide a gas-insulated power device and a method for controlling the internal pressure of a power device that can safely relieve the rise in internal pressure of the power device when abnormal energy is generated inside the power device due to a serious failure, etc.

[0017] Furthermore, the present invention aims to provide a gas-insulated power device and a method for controlling the internal pressure of a power device that can safely resolve a rapid increase in internal pressure caused by serious failures, even when using a flammable gas as an insulating gas that has not previously been applied as an insulating gas for power devices.

[0018] The objectives of the present invention are not limited to those mentioned above, and other objectives and advantages of the present invention not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof described in the claims.

[0019] According to one aspect of the present invention for achieving the above-mentioned purpose, a gas-insulated power device is provided, comprising: a housing in which a power device is housed and an insulating gas is sealed; and an arc extinguishing part coupled to the housing, which adjusts the component ratio of the insulating gas and then discharges it to the outside before discharging the insulating gas discharged from the housing to the outside in an abnormal state in which the internal pressure of the housing rises abnormally.

[0020] Preferably, the arc extinguishing unit may include: a primary pressure relief valve that discharges insulating gas from the housing to the arc extinguishing unit when the internal pressure of the housing reaches the abnormal pressure of the housing; a primary discharge pipe that receives the insulating gas discharged from the housing through the primary pressure relief valve before releasing it to the outside and generates exhaust gas by changing the composition ratio of the insulating gas; and a secondary pressure relief valve that discharges exhaust gas from the primary discharge pipe to the outside when the internal pressure of the primary discharge pipe reaches the abnormal pressure of the arc extinguishing unit.

[0021] Preferably, the arc extinguishing unit may further include: a buffer gas valve for supplying buffer gas to the primary discharge pipe or discharging buffer gas from the primary discharge pipe; and a control unit for controlling the composition ratio of the buffer gas in the primary discharge pipe by adjusting the buffer gas valve according to the composition of the insulating gas so that the exhaust gas has a composition ratio that allows it to be discharged into the atmosphere.

[0022] Preferably, the arc extinguishing section may further include a secondary exhaust pipe having a cross-sectional area smaller than that of the primary exhaust pipe and providing a path for discharging exhaust gas from the primary exhaust pipe to the outside through the secondary pressure relief valve.

[0023] Preferably, the arc extinguishing unit may further include a filter for filtering out foreign substances from the exhaust gas discharged to the outside from the arc extinguishing unit.

[0024] Preferably, the primary pressure relief valve can be opened when an internal arc failure occurs in the housing.

[0025] Preferably, the insulating gas is a mixture of a flammable gas and a non-flammable gas, and the arc extinguishing unit may further include a control unit that mixes one or more of the flammable gas or the non-flammable gas with the insulating gas discharged from the housing to generate an exhaust gas in which the composition of the flammable gas falls within a range above the upper combustion limit or below the lower combustion limit.

[0026] Preferably, the insulating gas may be a mixed gas comprising one or more of a flammable gas, a combustion-supporting gas, and a non-combustible gas.

[0027] Preferably, the insulating gas may be a mixed gas comprising one or more selected from the group comprising dry air, carbon dioxide, carbon dioxide, and oxygen.

[0028] According to another aspect of the present invention for achieving the above-described purpose, a normal housing pressure (P0) is a pressure exceeding the ambient pressure (P0) in a housing in which a power equipment device is housed. 1S In a method for controlling the internal pressure of a gas-insulated power device filled with insulating gas, wherein the internal pressure of the housing is the normal pressure of the housing (P 1S Housing abnormal pressure (P) which is a pressure exceeding ) 1U A method for controlling the internal pressure of a gas-insulated power device is provided, wherein when an abnormal condition is reached, insulating gas is discharged from the housing to the arc extinguishing section, and before the insulating gas discharged from the housing is released to the outside, the component ratio of the insulating gas is adjusted in the arc extinguishing section to generate exhaust gas.

[0029] Preferably, the above arc part has a housing normal pressure (P0) greater than or equal to the ambient pressure (P0) and is equal to or greater than the above ambient pressure (P0). 1S Normal pressure of the arc extinguishing section (P) which is a pressure below ) 2S Buffer gas is filled with ) and when insulating gas flows from the housing into the arc extinguishing section, the buffer gas and insulating gas are mixed to generate exhaust gas, and the exhaust gas can be discharged to the outside from the arc extinguishing section.

[0030] Preferably, the insulating gas is a mixture of a flammable gas and a non-flammable gas, and in the arc extinguishing section, one or more of the flammable gas or the non-flammable gas are mixed with the insulating gas discharged from the housing to generate exhaust gas, and when the exhaust gas is released to the outside, the composition of the flammable gas may fall within a range above the upper combustion limit or below the lower combustion limit.

[0031] Preferably, the insulating gas is a mixture of a flammable gas and a non-flammable gas, and is a mixture containing a low concentration of flammable gas in which the composition of the flammable gas is less than the composition of the non-flammable gas, and in the arc extinguishing section, the non-flammable gas is further mixed into the insulating gas to generate exhaust gas, and when the exhaust gas is released to the outside, the composition of the flammable gas may fall within a range below the lower combustion limit.

[0032] Preferably, the insulating gas is a mixture of a flammable gas and a non-flammable gas, and is a mixture containing a high concentration of flammable gas in which the composition of the flammable gas is greater than the composition of the non-flammable gas, and in the arc extinguishing section, the flammable gas is further mixed into the insulating gas to generate exhaust gas, and when the exhaust gas is released to the outside, it can generate exhaust gas in which the composition of the flammable gas is greater than or equal to the upper combustion limit.

[0033] Preferably, the insulating gas may be a mixed gas comprising one or more of a flammable gas, a combustion-supporting gas, and a non-combustible gas.

[0034] The gas-insulated power equipment and the pressure control method for the power equipment according to the present invention, by providing an arc extinguishing unit, can safely discharge the insulating gas from the power equipment even if the internal temperature and pressure rise rapidly due to abnormal energy generated by a failure of the power equipment filled with insulating gas.

[0035] In addition, by safely releasing high-temperature and high-pressure insulating gas, risks such as damage to power equipment, explosions, scattering, fires, and casualties caused by abnormal pressure increases can be prevented.

[0036] In addition, environmentally friendly flammable gases with a GWP of 1 or less can be safely used as insulating gases for power equipment.

[0037] In particular, even when flammable gas is used as an insulating gas, electrical equipment can be operated safely without the problem of combustion or explosion of the insulating gas. Even if insulating gas containing flammable gas is urgently released from the housing due to a serious failure of the electrical equipment, the composition of the flammable gas is controlled through the arc extinguishing unit before being released to the outside, thereby allowing the internal pressure of the electrical equipment to be controlled without the insulating gas burning or exploding even when in contact with combustible gases in the atmosphere.

[0038] The effects of the present invention are not limited to the effects described above. Unmentioned effects will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

[0039] FIG. 1 is a simplified schematic diagram illustrating a gas-insulated power device according to one embodiment of the present invention.

[0040] FIG. 2 is a simplified schematic diagram illustrating a gas-insulated power device according to another embodiment of the present invention.

[0041] FIG. 3 is a simplified diagram illustrating an arc extinguishing section according to one embodiment of the present invention.

[0042] FIG. 4 is a simplified configuration diagram illustrating an arc extinguishing section according to another embodiment of the present invention.

[0043] FIG. 5 is a diagram illustrating an example of a combustion range triangle diagram of a mixed gas containing a flammable gas as an insulating gas according to embodiments of the present invention.

[0044] FIG. 6 is a triangular diagram of the combustion range of a mixed gas containing a low concentration of flammable gas as an insulating gas according to embodiments of the present invention, FIG. 6 (a) is a diagram showing the change in composition ratio when the insulating gas is discharged from the housing through the arc extinguishing section to the outside, and FIG. 6 (b) is a comparative example of FIG. 6 (a) showing the change in composition ratio when the insulating gas is discharged from the housing without passing through the arc extinguishing section to the outside.

[0045] FIG. 7 is a triangular diagram of the combustion range of a mixed gas containing a high concentration of flammable gas as an insulating gas according to embodiments of the present invention, FIG. 6 (a) is a diagram for showing the change in composition ratio when the insulating gas is discharged from the housing through the arc extinguishing section to the outside, and FIG. 6 (b) is a comparative example of FIG. 6 (a) for showing the change in composition ratio when the insulating gas is discharged from the housing without passing through the arc extinguishing section to the outside.

[0046] To fully understand the operational advantages of the present invention and the objectives achieved by the embodiments of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described therein. Even if the accompanying drawings are not directly mentioned, if a person skilled in the art can obviously grasp the operating principle solely from the contents depicted in the drawings, it shall be deemed to be described in this specification.

[0047] The structure and operation of a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. It should be noted that in assigning reference numerals to the components of each drawing, identical components are denoted by the same numeral whenever possible, even if they are shown in different drawings. Furthermore, the following embodiment may be modified in various different forms, and the scope of the present invention is not limited to the following embodiment.

[0048]

[0049] In the embodiments of the present invention described below, the power equipment is an electrical device that uses gas as an insulator and may include a gas-insulated switchgear (GIS), a gas-insulated transformer (GIT), a gas-insulated breaker (GCB), a gas-insulated busbar, etc.

[0050] In addition, in describing the embodiments of the present invention, power equipment may be applied to all high-voltage power equipment operating at low voltage, high voltage, or ultra-high voltage. Low-voltage power equipment may refer to power equipment with an operating voltage of about 36 kV or less, high-voltage power equipment may refer to power equipment with an operating voltage exceeding about 36 kV and less than 72.5 kV, and ultra-high-voltage power equipment may refer to power equipment with an operating voltage of about 72.5 kV or more.

[0051] In the embodiments of the present invention described below, the power equipment is described based on the assumption that it is an ultra-high voltage gas-insulated switchgear. However, it is not limited thereto and can be applied in the same way to other gas-insulated power equipment.

[0052] In addition, in the embodiments of the present invention described below, the insulating gas may be a single-component gas or a multi-component mixed gas comprising a gas having a GWP of 24,300 or less or a gas having a GWP of 1 or less.

[0053] In describing embodiments of the present invention, the insulating gas is described as a multi-component mixed gas containing a flammable gas having a GWP of 1 or less, and is described as a mixed gas of a flammable gas and a non-flammable gas. Here, the non-flammable gas may be an inert gas, a non-flammable gas, or an extinguishment gas.

[0054] In addition, in describing embodiments of the present invention, the insulating gas may be composed of one or more natural origin gases present in the air selected from the group comprising dry air, a mixture of carbon dioxide and oxygen, and carbon dioxide.

[0055] In addition, in describing embodiments of the present invention, the insulating gas may be a mixed gas included within the compositional range constituting the combustion range triangle diagram illustrated in FIGS. 5 to 7. The compositional range constituting the combustion range triangle diagram includes cases where the composition of one or more gases among the flammable gas (combustible gas), combustion-supporting gas, and inert gas forming the combustion range triangle diagram is 0 or 1.

[0056]

[0057] Hereinafter, gas-insulated power equipment and a method for controlling the internal pressure of power equipment according to embodiments of the present invention will be described with reference to the attached drawings.

[0058] First, referring to FIGS. 1 to 4, a gas-insulated power device (1) according to one embodiment of the present invention may include a housing (100) in which power device devices (not shown), such as a circuit breaker and a busbar, are housed and insulating gas is sealed, and an arc extinguishing part (200) that provides a path to safely discharge insulating gas from the housing (100) in an abnormal state in which the pressure inside the housing (100) rises abnormally.

[0059] The housing (100) and the arc part (200) of this embodiment may be made of metal and may be a circular tank with a circular cross-section.

[0060] Additionally, the housing (100) and the arc extinguishing unit (200) may have a design pressure higher than atmospheric pressure or the pressure of the surrounding environment where the power device (1) is installed. The interior of the housing (100) may be filled with insulating gas at a pressure higher than atmospheric pressure or the pressure of the surrounding environment where the gas-insulated power device (1) is installed.

[0061] The insulating gas filled into the housing (100) is filled with a composition that falls outside the boundary value of the combustion range, even if it is a multi-component mixed gas containing flammable gas. That is, even if the insulating gas contains flammable gas, combustion of the insulating gas does not occur within the housing (100) unless additional gas of other components is introduced into the housing (100).

[0062] Here, atmospheric pressure or the pressure of the space where the gas-insulated power device (1) is installed is called the ambient pressure (P0), and the pressure in a normal state where the housing (100) is filled with insulating gas and the power device (1) operates normally is called the 'housing normal pressure (P0).' 1S It is decided to call it )’. When an abnormal condition, such as a malfunction, occurs inside the housing (100) and an arc is generated, the insulating gas filled in the housing (100) expands due to the high heat of the arc, and the internal pressure of the housing (100) rises rapidly due to the expansion of the insulating gas. When the internal pressure of the housing (100) rises abnormally, insulating gas is discharged from the housing (100) to the arc extinguishing part (200) in order to relieve the pressure rise of the housing (100).

[0063] Here, the internal pressure of the housing (100) is in a state where it is abnormally elevated, that is, the pressure designed to discharge insulating gas from the housing (100) to the arc extinguishing section (200) is called the 'housing abnormal pressure (P 1U It is decided to call it )'.

[0064] The filling pressure of the housing (100) of the present embodiment, i.e., the normal pressure of the housing (P 1S ) exceeds ambient pressure (P0), and '0 barg ≤ P 1S ≤ 10 barg' or '5 barg ≤ P 1S ≤ 10 barg' or '7 barg ≤ P 1S It can be ≤ 10 barg'.

[0065] In addition, housing abnormal pressure (P1U ) is the housing normal pressure (P 1S It may be 1.1 to 10 times, or 1.4 to 10 times, and, for example, 3 times or 5 times.

[0066] In addition, housing abnormal pressure (P 1U ) is the housing normal pressure (P 1S When ) is 0 to 2 barg, the housing normal pressure (P 1S It can be 1.4 to 10 times the normal pressure of the housing (P 1S If ) is 4 barg or more, the housing normal pressure (P 1S It can be 5 times )

[0067] The arc extinguishing unit (200) is coupled to the housing (100), and the housing (100) and the arc extinguishing unit (200) may be provided with a primary pressure relief valve (210) for releasing insulating gas from the housing (100) to the arc extinguishing unit (200) when the internal pressure of the housing (100) exceeds a set pressure.

[0068] The Soho unit (200) may be a means to suppress the rise in temperature and pressure inside the housing (100) caused by abnormal energy due to a failure occurring inside the housing (100), and to relieve the rise in temperature and pressure.

[0069] By providing an arc suppression unit (200), rapid pressure rise and flame spread caused by the arc inside the housing (100) can be effectively suppressed.

[0070] FIGS. 1 and 2 illustrate an example in which a single arc extinguishing unit (200) is coupled to a housing (100), but in this embodiment, multiple arc extinguishing units (200) may be coupled to the housing (100) in series or in parallel. That is, the insulating gas discharged from the housing (100) may be divided into multiple arc extinguishing units (200) and then discharged to the outside, or it may be discharged to the outside after passing through multiple arc extinguishing units (200) in succession.

[0071] The housing (100) and the arc extinguishing unit (200) of this embodiment share a primary pressure relief valve (210), and the interior of the housing (100) and the arc extinguishing unit (200) can be opened and closed by the primary pressure relief valve (210).

[0072] That is, at least one primary pressure relief valve (210) is provided at one end of the arc extinguishing portion (200) in contact with the housing (100), and the internal pressure of the housing (100) is in a normal state, i.e., the abnormal pressure of the housing (P 1U It is closed when the internal pressure of the housing (100) is less than ), and then when the internal pressure of the housing (100) is in an abnormal state, i.e., the housing abnormal pressure (P 1U When it reaches ), it opens, allowing insulating gas to be released from inside the housing (100) to the arc extinguishing part (200).

[0073] In this embodiment, the primary pressure relief valve (210) can be opened when the housing (100) is in an abnormal state. Here, an abnormal state refers to a situation where a serious malfunction occurs inside the housing (100), causing the internal pressure to rise rapidly and the housing abnormal pressure (P 1u It means a state reaching ). Here, a serious fault may include, for example, an internal arc fault.

[0074] Internal arc failure is one of the forms of serious failures that occur inside the housing (100), where an electrical short circuit or failure occurs inside the housing (100), causing thermal, mechanical, and electrical damage, and can lead to a dangerous situation, especially when it occurs in high-voltage power equipment (1).

[0075] The causes of internal arc failure may include abnormal arc generation due to insulation failure, abnormal arc generation due to poor contact, abnormal arc generation due to the intrusion of external foreign matter, abnormal arc generation due to mechanical damage, and abnormal arc generation due to design or manufacturing defects.

[0076] More specifically, if the insulation performance of the insulator deteriorates due to aging, contamination, or physical damage, the insulation condition is poor, and an abnormal arc may occur. Additionally, if the electrical contact surface between parts inside the housing (100) is poor and local overheating occurs, the arc may progress abnormally. Furthermore, if external substances such as dust or moisture enter the housing (100), an abnormal arc may occur. Also, if parts inside the housing (100) are damaged or deformed due to errors during equipment assembly or vibration or shock during use, an abnormal arc may occur. Additionally, an abnormal arc may occur due to internal defects resulting from incomplete design, assembly errors, or failure of quality control.

[0077] The fault current generated by an internal arc failure causes an arc of significant energy. Due to the arc energy reaching tens of MJ, the insulating gas filled inside the housing (100) becomes plasma, and the metal or insulating material inside the housing (100) undergoes a vaporization process. During this process, an exothermic reaction occurs, resulting in a high temperature of thousands to tens of thousands of Kelvin. When the insulating gas filled inside the housing (100) expands due to the high temperature, the pressure inside the housing (100) rises rapidly, causing mechanical shock to the housing (100) itself, which causes an explosion.

[0078] If the housing (100) explodes, the power device (1) may become inoperable, and if the power device (1) becomes inoperable, a problem arises in which power supply to the downstream load of the power device (1) is impossible. In addition, due to the explosion of the housing (100), the internal high-temperature, high-pressure thermal energy spreads to the outside, posing a risk of explosion, scattering, and fire in the surrounding environment, and if nearby workers or pedestrians are exposed to the high-temperature, high-pressure arc and gas spread from the housing (100), it may cause serious injury.

[0079] According to the present embodiment, an internal arc failure or the like occurs in the housing (100), and the internal pressure of the housing (100) becomes the set pressure (i.e., housing abnormal pressure (P 1U When it reaches )), the primary pressure relief valve (210) is opened to discharge high-temperature, high-pressure insulating gas from the housing (100), thereby preventing the above-mentioned problems caused by the explosion of the housing (100).

[0080] The high-temperature, high-pressure insulating gas discharged from the housing (100) through the primary pressure relief valve (210) of this embodiment flows into the arc extinguishing section (200).

[0081] The arc extinguishing section (200) of the present embodiment may include a primary discharge pipe (220) that is filled with buffer gas and receives insulating gas discharged from the housing (100) through the primary pressure relief valve (210) before releasing it to the outside. The primary pressure relief valve (210) may be provided on one side of the primary discharge pipe (220).

[0082] Inside the primary discharge pipe (220), buffer gas is present at the normal pressure (P) of the arc extinguishing section. 2S It may be filled with ). Here, the normal pressure of the arc extinguishing section (P 2S ) is the housing normal pressure (P 1S ) or less, and may be a pressure greater than or equal to the ambient pressure (P0) (i.e., P 1S ≥P 2S ≥P0).

[0083] In the primary discharge pipe (220) of the present embodiment, the buffer gas filled in the primary discharge pipe (220) and the insulating gas introduced from the housing (100) through the primary pressure relief valve (210) can be mixed to generate exhaust gas.

[0084] In addition, the arc extinguishing section (200) of the present embodiment is provided with at least one on the other side of the primary discharge pipe (220), and the internal pressure of the primary discharge pipe (220) is the abnormal pressure (P) of the arc extinguishing section 2U It may include a secondary pressure relief valve (230) that opens when it reaches the primary discharge pipe (220) and releases the exhaust gas that was sealed in the primary discharge pipe (220) to the outside.

[0085] Here, abnormal pressure in the arc section (P 2U ) is the normal pressure of the arc section (P 2S It may be 1.5 to 3 times, or 1.5 to 2.5 times, or 2 times.

[0086] When the primary pressure relief valve (210) is opened and high-temperature, high-pressure insulating gas flows from the housing (100) into the primary discharge pipe (220), the internal pressure of the primary discharge pipe (220) will rise. Due to the high-temperature, high-pressure insulating gas flowing into the primary discharge pipe (220), the internal pressure of the primary discharge pipe (220) becomes the abnormal pressure (P) of the arc extinguishing section. 2U When it rises to ), the secondary pressure relief valve (230) opens so that the exhaust gas generated in the primary discharge pipe (220) can be released to the outside.

[0087] The arc extinguishing section (200) of the present embodiment may further include a secondary discharge pipe (240) that provides a path for the exhaust gas discharged from the primary discharge pipe (220) to flow out through the secondary pressure relief valve (230).

[0088] One side of the secondary discharge pipe (240) is connected to the primary discharge pipe (220) downstream of the secondary pressure relief valve (230), and the other side may be provided with a discharge gas discharge section (not given a reference number) that is connected to the outside.

[0089] The design pressure (P) of the primary pressure relief valve (210) of this embodiment 1D ) can satisfy Equation 1.

[0090] … … … … <Formula 1>

[0091] In addition, the design pressure (P2) of the secondary pressure relief valve (230) of this embodiment D ) can satisfy Equation 2.

[0092] … … … … <Equation 2>

[0093] However, Equation 1 and Equation 2 are, P 1U >P 1S >P0, P 2U >P2S ≥P0, P 1S ≥P 2S It can be established when ≥P0 is satisfied.

[0094] That is, housing normal pressure (P 1S ) exceeds the ambient pressure (P0) while the housing abnormal pressure (P 1U ) is the housing normal pressure (P 1S Exceeding ) and normal pressure of the arc section (P 2S ) is greater than the ambient pressure (P0) and the abnormal pressure (P) of the arc extinguishing section 2U ) is the normal pressure of the arc section (P 1S Exceeding ) and housing normal pressure (P 1S ) is the normal pressure of the arc section (P 2S When ) or more, the design pressure (P) of the primary pressure relief valve (210) 1D ) is the housing normal pressure (P 1S ) and normal pressure of the arc section (P 2S Exceeding the difference of ) housing abnormal pressure (P 1U ) and normal pressure of the arc section (P 2S It may fall within the range of differences less than ).

[0095] In addition, housing normal pressure (P 1S ) exceeds the ambient pressure (P0) while the housing abnormal pressure (P 1U ) is the housing normal pressure (P 1S Exceeding ) and normal pressure of the arc section (P 2S ) is greater than the ambient pressure (P0) and the abnormal pressure (P) of the arc extinguishing section 2U ) is the normal pressure of the arc section (P 1S Exceeding ) and housing normal pressure (P 1S ) is the normal pressure of the arc section (P 2S When ) or more, the design pressure (P) of the secondary pressure relief valve (230) 2D ) is the normal pressure of the arc section (P 2S Exceeding the difference between ) and the surrounding pressure (P0), the abnormal pressure (P) of the arc extinguishing section 2U ) and normal pressure of the arc section (P 2S It may fall within the range of the sum of ).

[0096] Housing normal pressure (P 1S) is 5 barg, and the normal pressure of the arc section (P 2S When ) is 4 barg, housing abnormal pressure (P 1U ) is the housing normal pressure (P 1S 3 times ) i.e., 15 barg, normal pressure of the arc section (P 2S Let's take the case of 2.5 times ) that is, 10 barg as an example.

[0097] At this time, the design pressure (P) of the primary pressure relief valve (210) 1D ) is the housing normal pressure (P 1S ) and normal pressure of the arc section (P 2S The difference of ), i.e., exceeding 1 barg (= 5 barg - 4 barg), and the abnormal housing pressure (P 1U ) and normal pressure of the arc section (P 2S The difference of ), that is, the range of 11 barg (= 15 barg - 4 barg) or less can be satisfied (i.e., 1 <P 1D ≤11). That is, the primary pressure relief valve (210) can be designed to withstand a range of more than 1 barg and less than or equal to 11 barg.

[0098] Also, at this time, the design pressure (P) of the secondary pressure relief valve (230) 2D ) is the normal pressure of the arc section (P 2S The difference between ) and the ambient pressure (P0), i.e., exceeding 4 barg (= 4 barg - 0 barg), and the abnormal pressure (P) in the arc extinguishing section 2U ) and normal pressure of the arc section (P 2S The sum of ) can satisfy the range of 14 barg (= 10 barg + 4 barg) or less (i.e., 4 <P 2D ≤14). That is, the secondary pressure relief valve (230) can be designed to withstand a range of more than 4 barg and less than or equal to 14 barg.

[0099] Meanwhile, the cross-sectional area of ​​the primary discharge pipe (220) may be smaller than the cross-sectional area of ​​the housing (100). Additionally, the cross-sectional area of ​​the secondary discharge pipe (240) may be smaller than the cross-sectional area of ​​the primary discharge pipe (220).

[0100] That is, the exhaust gas flowing from the housing (100) through the primary pressure relief valve (210) into the primary discharge pipe (220), which has a cross-sectional area smaller than that of the housing (100), has its pressure reduced according to Bernoulli's principle.

[0101] Additionally, the exhaust gas introduced from the primary exhaust pipe (220) into the secondary exhaust pipe (240) through the secondary pressure relief valve (230) flows through the secondary exhaust pipe (240) with a small cross-sectional area, and its pressure decreases according to Bernoulli's principle, and it can be safely discharged to the outside at the reduced pressure.

[0102] The arc extinguishing unit (200) of the present embodiment may further include a filter for filtering out foreign substances in the insulating gas supplied from the housing (100) to the arc extinguishing unit (200) or the discharge gas discharged from the arc extinguishing unit (200) to the outside.

[0103] A filter for filtering foreign substances in the exhaust gas discharged from the arc section (200) to the outside may include one or more primary filters (270) for filtering foreign substances from the exhaust gas discharged from the primary exhaust pipe (220) to the secondary exhaust pipe (240), and one or more secondary filters (280) for filtering foreign substances from the exhaust gas discharged from the secondary exhaust pipe (240).

[0104] Referring to FIG. 3, a primary filter (270) may be provided upstream of a secondary pressure relief valve (230). That is, when a primary filter (270) is included, the exhaust gas discharged from the primary discharge pipe (220) through the secondary pressure relief valve (230) may be introduced into the secondary discharge pipe (240) after foreign substances are filtered by the primary filter (270).

[0105] Additionally, referring to FIG. 4, the secondary filter (280) may be provided downstream of the secondary pressure relief valve (230) and inside the secondary discharge pipe (240). That is, when the secondary filter (280) is included, the exhaust gas flowing along the secondary discharge pipe (240) can be discharged to the outside after foreign substances are filtered by the secondary filter (280).

[0106] Here, foreign substances filtered by the first filter (270) or the second filter (280) may include metallic substances, carbon-based solid substances, etc. generated as the arc is extinguished inside the housing (100).

[0107] Meanwhile, the arc part (200) of the present embodiment may be coupled to the outside of the housing (100) and provided on the outside of the housing (100), as shown in FIG. 1.

[0108] Additionally, as shown in FIG. 2, at least a portion of the arc extinguishing section (200) may be provided inside the housing (100). However, even if a portion of the arc extinguishing section (200) is provided inside the housing (100), at least a gas discharge section (not given a reference numeral) through which exhaust gas is discharged to the outside from the secondary discharge pipe (240) may be provided outside the housing (100).

[0109] For example, if a part of the arc section (200) is provided inside the housing (100), the primary discharge pipe (220) may be provided in the internal space of the housing (100), and the secondary discharge pipe (240) may be provided outside the housing (100). In this case, the primary pressure relief valve (210) may be provided on one side of the primary discharge pipe (220) from the internal space of the housing (100), and the secondary pressure relief valve (230) may be provided on the outer surface of the housing (100), which is on the other side of the primary discharge pipe (220) and on one side of the secondary discharge pipe (240). The other side of the secondary discharge pipe (240) is provided with a gas discharge section through which exhaust gas is discharged to the outside from the secondary discharge pipe (240).

[0110] The buffer gas of the present embodiment may include an insulating gas filled into the housing (100). In the case where the insulating gas is a mixed gas in which two or more different gases are mixed as in the present embodiment, the buffer gas may be any one of the two or more different gases included in the mixed gas, or a mixture of two or more different gases, and the composition ratio may be the same or different.

[0111] In the case where the power device (1) is in a three-phase integrated form that supplies electricity by alternately using three waves, there is an advantage in that the power device (1) can be miniaturized, but if a serious failure such as an internal arc failure occurs, it starts with a short circuit between the phase and ground, and as the failure develops, it expands to a short circuit between phases, and a combination of a phase-ground arc and two or more parallel arcs between phases occurs, and there is a problem that arc energy of tens of MJ is exposed to the insulating gas. Eventually, the insulating gas becomes plasma, and the dissociated molecules react with the internal device and insulating materials for heat generation, so the degree of temperature and pressure rise inside the housing (100) is bound to increase.

[0112] If the insulating gas contains flammable gas, the degree of temperature and pressure rise when an internal arc fault occurs will increase much more rapidly compared to the case where the insulating gas does not contain flammable gas.

[0113] That is, in the case of a gas-insulated power device (1) to which an insulating gas containing flammable gas is applied, the expected effect of applying a pressure rise control technique or a pressure relief technique to which an internal arc fault occurs in a conventional gas-insulated power device to which an insulating gas not containing flammable gas is applied is limited.

[0114] The arc section (200) of the present embodiment may further include a buffer gas valve (250) for controlling the inflow of buffer gas into the primary discharge pipe (220) and the discharge of buffer gas from the primary discharge pipe (220).

[0115] Additionally, the Soho section (200) may further include a discharge pipe pressure gauge (260) for measuring the internal pressure of the primary discharge pipe (220).

[0116] Additionally, the arc extinguishing unit (200) according to the present embodiment may further include a control unit (not shown) for controlling the buffer gas valve (250) to control one or more of the composition, concentration, or pressure of the buffer gas filled in the primary discharge pipe (220).

[0117] The control unit of the present embodiment can perform the role of adjusting the composition ratio of the buffer gas filled in the first discharge pipe (220) so that the composition ratio of the exhaust gas generated by mixing the insulating gas introduced into the first discharge pipe (220) through the first pressure relief valve (210) with the buffer gas filled in the first discharge pipe (220) is within a range that can be discharged to the outside.

[0118] In the above embodiment, it was decided to explain using an example where the insulating gas is a multi-component mixed gas containing a flammable gas with a GWP of 1 or less and a non-flammable gas.

[0119] Figure 5 illustrates an exemplary combustion triangle of a flammable gas with a GWP of 1 or less.

[0120] All flammable gases have specific conditions for ignition. If these ignition conditions are not met, the flammable gas will not ignite, but if they are met, the flammable gas will ignite and burn. The ignition conditions of a flammable gas are determined by the composition of the combustible gas, the combustible material (flammable gas, flammable gas), and the non-combustible gas. The relationship between these three materials can be represented by a diagram called the 'combustion range triangle'.

[0121] The flammability region is a representation of the flammability region according to changes in the composition of combustible gas, flammable gas, and non-flammable gas, and the flammability region varies depending on the type of flammable material. In this embodiment, the case where the flammable gas is perfluoromethyl vinyl ether (PMVE) is used as an example, but it can be applied in the same way to other flammable gases.

[0122] Referring to Fig. 5, the A-axis of the combustion range triangle represents the ratio of a combustible gas in the mixed gas, e.g., oxygen; the B-axis represents the ratio of a flammable gas in the mixed gas, e.g., PMVE; and the C-axis represents the ratio of a non-combustible gas in the mixed gas, e.g., nitrogen or carbon dioxide, as a mass ratio or volume ratio, and the points within the combustion range triangle represent the ratio of each component. That is, the sum of the ratios of the three components at each point within the combustion range triangle is 1.

[0123] In addition, the area labeled 'Flammability Region' in Fig. 5 is determined by scientific approaches such as experiments or calculations, and the line formed by connecting points becomes the boundary value of the flammability region, and the mixing ratio corresponding to the inside of the boundary value, that is, the area formed by the boundary value, becomes the component ratio in which the flammable gas burns.

[0124] It is desirable to set the composition ratio of the insulating gas charged into the power device (1) to exist in the area outside the combustion range boundary value of the combustion triangle diagram, that is, in the non-combustion range, so that combustion does not occur within the power device.

[0125] However, when insulating gas containing flammable gas is ejected from the housing (100), the composition ratio of the flammable gas in the ejected insulating gas changes due to the external environment of the power device (1). At this time, if the composition ratio of the insulating gas exposed to the external environment moves into the area formed by the combustion range boundary value in the combustion range triangle diagram, that is, into the combustion range, the insulating gas burns.

[0126] When insulating gas discharged from the housing (100) through the primary pressure relief valve (210) without including the primary discharge pipe (220) is released to the outside as is and exposed to the surrounding environment of the housing (100), i.e., the atmosphere, the composition of the insulating gas, which is a multi-component mixed gas, changes due to air containing nitrogen, oxygen, etc., and if the composition ratio changed by the surrounding environment is within the combustion range, the insulating gas ignites and a risk of combustion occurs.

[0127] Accordingly, the control unit of the present embodiment can perform the function of adjusting the composition of the buffer gas filled in the first discharge pipe (220) so that the composition ratio of the exhaust gas generated by mixing the insulating gas introduced into the first discharge pipe (220) through the first pressure relief valve (210) with the buffer gas filled in the first discharge pipe (220) does not exist within the combustion range even when the exhaust gas is released to the outside and exposed to the surrounding environment of the housing (100), that is, becomes a non-flammable gas existing in the non-combustion range.

[0128] Hereinafter, an exemplary operation of the control unit will be described with reference to FIGS. 1 to 7. The points (α1, β1) marked as hollow rectangles in FIGS. 6 and 7 represent examples of the component ratios of the insulating gas filled inside the housing (100). The insulating gas filled inside the housing (100) is a mixed gas in which flammable gas and non-combustible gas are mixed, and does not include a combustion-supporting gas.

[0129] In addition, the points (α2, β2) marked as solid squares in FIGS. 6(a) and FIGS. 7(a) represent examples of the component ratios in which the exhaust gas released into the atmosphere from the housing (100) through the arc extinguishing section (200) has its component ratio changed by the combustion-supporting gas in the atmosphere.

[0130] Additionally, FIGS. 6(b) and FIGS. 7(b) are comparative examples of the exhaust gas shown in FIGS. 6(a) and FIGS. 7(a), respectively, and the points (α3, β3) marked with solid squares in FIGS. 6(b) and FIGS. 7(b) represent examples of the component ratios in which the component ratios are changed by the combustion-supporting gas when insulating gas is released into the atmosphere from the housing (100) without passing through the arc extinguishing part (200).

[0131] According to the present embodiment, the control unit can control the concentration of flammable gas (B) or non-flammable gas (C) in the primary discharge pipe (220) so that when exhaust gas is discharged to the outside through the secondary pressure relief valve (230) and mixed with oxygen, which is a combustible gas (A) in the atmosphere, the composition of the flammable gas (B) relative to the composition of oxygen becomes below the lower combustion limit at which combustion cannot occur.

[0132] FIG. 6 is an example in which the insulating gas filled inside the housing (100) is a mixed gas containing a low concentration of flammable gas, where the composition of the flammable gas is less than the composition of the non-flammable gas. In this case, the composition ratio of the combustible gas (A), flammable gas (B), and non-flammable gas (C) constituting the mixed gas is explained by exemplifying the point 'α1' (0, 0.1, 0.9). That is, the mixed gas contains 10% flammable gas and 90% non-flammable gas based on mass or volume.

[0133] When the insulating gas is a mixed gas containing a low concentration of flammable gas, if the insulating gas is discharged directly to the outside from the housing (100) without passing through the arc extinguishing unit (200) of this embodiment, the oxygen, which is a combustion-supporting gas contained in the atmosphere, increases in the composition ratio of the insulating gas. Since the sum of the compositions of the combustion-supporting gas (A), the flammable gas (B), and the non-combustible gas (C) is 1, if the composition of the combustion-supporting gas (A) increases, the compositions of the flammable gas (B) and the non-combustible gas (C) decrease relatively. Referring to FIG. 6(b), in the combustion range triangle diagram, the composition ratio of the insulating gas moves from point 'α1' in the direction of increase along the A-axis, while moving in the direction of decrease along the B-axis and C-axis (refer to the arrow in FIG. 6(b)).

[0134] For example, if the composition of the combustible gas (A) increases by 0.20 as it is released directly to the outside without passing through the arc section (200) of the present embodiment, and the flammable gas (B) and non-flammable gas (C) in the insulating gas are diluted so that the composition of the flammable gas (B) decreases by 0.05 and the composition of the non-flammable gas (C) decreases by 0.10, the composition ratio of the insulating gas released into the atmosphere becomes point 'α3' (0.25, 0.15, 0.6) in FIG. 6(b), and this exists within the combustion range.

[0135] According to the present embodiment, before discharging the insulating gas to the outside, the insulating gas is introduced into the primary discharge pipe (220) through the primary pressure relief valve (210) to form exhaust gas, and then the exhaust gas is discharged into the atmosphere. The control unit controls the buffer gas valve (250) to supply non-combustible gas (C) to the primary discharge pipe (220), thereby mixing the non-combustible gas (C) with the insulating gas to generate exhaust gas. When this exhaust gas is discharged into the atmosphere, it becomes point 'α2' in FIG. 6(a), which has a composition ratio of flammable gas concentration below the lower combustion limit.

[0136] The control of the buffer gas valve (250) may be performed when the primary pressure relief valve (210) is opened, or it may be performed in advance so that the primary discharge pipe (220) is filled with buffer gas before the primary pressure relief valve (210) is opened.

[0137] There is no combustible gas (A) in the primary discharge pipe (220). When non-combustible gas (C) is mixed with insulating gas in a state where there is no combustible gas (A), and the composition ratio of insulating gas changes in the direction of increasing non-combustible gas (C), the composition ratio of flammable gas (B) changes in the direction of decreasing.

[0138] Referring to FIG. 6(a), for example, when a non-combustible gas (C) is mixed with an insulating gas and the composition of the non-combustible gas (C) in the insulating gas increases by 0.05, the flammable gas (B) is diluted and its composition decreases by 0.05, so that an exhaust gas with a composition ratio of (0, 0.05, 0.95) is produced in the primary exhaust pipe (220).

[0139] When the secondary pressure relief valve (230) is opened and the exhaust gas generated in the primary exhaust pipe (220) is released into the atmosphere, it is exposed to the combustible gas (A) in the atmosphere, and the composition of the combustible gas (A) in the exhaust gas will increase by 0.20. At this time, the composition of the flammable gas (B) is diluted by the combustible gas (A), and the composition of the non-combustible gas (C) is reduced by 0.05 and reduced by 0.10, so that the composition ratio of the exhaust gas in the atmosphere becomes 'point α2' (0.25, 0, 0.75) in FIG. 6(a). This falls within the non-combustion range below the lower combustion limit.

[0140] In addition, according to the present embodiment, the control unit may control the concentration of non-combustible gas (C) or flammable gas (B) in the primary discharge pipe (220) so that when the exhaust gas is discharged to the outside through the secondary pressure relief valve (230) and mixed with oxygen, which is a combustible gas (A) in the atmosphere, the composition of the flammable gas (B) relative to the composition of oxygen becomes greater than the upper combustion limit at which combustion cannot occur.

[0141] FIG. 7 is an example in which the insulating gas filled inside the housing (100) is a mixed gas containing a high concentration of flammable gas, wherein the composition of the flammable gas is greater than the composition of the non-flammable gas. In this case, the composition ratio of the combustible gas (A), flammable gas (B), and non-flammable gas (C) constituting the mixed gas is explained as an example corresponding to point 'β1' (0, 0.5, 0.5). That is, the mixed gas contains 50% flammable gas and 50% non-flammable gas based on mass or volume.

[0142] When the insulating gas is a mixed gas (point 'β1') containing a high concentration of flammable gas, if the insulating gas is discharged directly to the outside from the housing (100) without passing through the arc extinguishing section (200) of this embodiment, the composition of the combustible gas (A) increases, as in the above-described embodiment, while the compositions of the flammable gas (B) and non-combustible gas (C) decrease relatively. Therefore, referring to FIG. 7(b), the composition ratio of the insulating gas on the combustion range triangle diagram moves in an increasing direction along the A-axis from point 'β1', while moving in a decreasing direction along the B-axis and C-axis (refer to the arrows in FIG. 7(b)).

[0143] For example, if an insulating gas having a composition ratio of a combustible gas (A), a flammable gas (B), and a non-combustible gas (C) at point 'β1' (0, 0.5, 0.5) is released directly to the outside without passing through the arc extinguishing section (200) of this embodiment, and the composition of the combustible gas (A) increases by 0.20, the composition of the flammable gas (B) decreases by 0.05, and the composition of the non-combustible gas (C) decreases by 0.10, then the composition ratio of the insulating gas released into the atmosphere moves to point 'β3' (0.25, 0.55, 0.2) and exists within the combustion range.

[0144] According to the present embodiment, before discharging the insulating gas corresponding to point 'β1' (0, 0.5, 0.5) where the composition ratio of the combustible gas (A), flammable gas (B), and non-combustible gas (C) is to the outside, it is introduced into the primary discharge pipe (220) through the primary pressure relief valve (210).

[0145] Before releasing the insulating gas to the outside, the control unit controls the buffer gas valve (250) to supply flammable gas (B) to the primary discharge pipe (220), thereby generating exhaust gas mixed with the insulating gas and flammable gas (B). When this exhaust gas is released into the atmosphere, it becomes a gas with a composition ratio greater than or equal to the upper combustion limit of the flammable gas, i.e., point 'β2' in FIG. 7(a).

[0146] Likewise, the control of the buffer gas valve (250) may be performed when the primary pressure relief valve (210) is opened, or it may be performed in advance so that the primary discharge pipe (220) is filled with buffer gas before the primary pressure relief valve (210) is opened.

[0147] When flammable gas (B) is mixed with insulating gas in a state where there is no combustible gas (A) in the primary discharge pipe (220), and the composition ratio of insulating gas changes in the direction of increasing flammable gas (B), the composition ratio of non-combustible gas (C) changes in the direction of decreasing.

[0148] For example, when a flammable gas (B) is mixed with an insulating gas and the composition of the flammable gas (B) in the insulating gas increases by 0.05, the non-flammable gas (C) is diluted and its composition decreases by 0.05, and an exhaust gas with a composition ratio of (0, 0.55, 0.45) is produced in the primary exhaust pipe (220).

[0149] When the secondary pressure relief valve (230) is opened and the exhaust gas generated in the primary exhaust pipe (220) is released into the atmosphere, it is exposed to the combustible gas (A) in the atmosphere, and the composition of the combustible gas (A) in the exhaust gas will increase by 0.20. At this time, the composition of the flammable gas (B) and the non-combustible gas (C) is reduced by being diluted by the combustible gas (A), and as a result, the composition ratio of the exhaust gas in the atmosphere moves to the position of point 'β2' (0.15, 0.65, 0.20) in FIG. 7(a). This falls within the non-combustion range above the upper combustion limit.

[0150] According to the present invention, as described above, before the insulating gas discharged from the housing (100) is exposed to the external environment, the composition ratio of the insulating gas is controlled in the primary discharge pipe (220) to generate the exhaust gas, and finally, the exhaust gas is discharged to the external environment, thereby preventing the problem of combustion of the insulating gas that may occur due to serious failure.

[0151] In addition, by controlling and discharging the component ratio of the insulating gas containing the flammable gas discharged from the housing (100) due to a serious malfunction in the arc extinguishing unit (200), the flammable gas, which could not be used as an insulating gas for the power equipment (1) until now, can be safely used as an insulating gas.

[0152] Meanwhile, the operation of the control unit according to the embodiments of the present invention can be applied based on the principle of the control operation described above even if the insulating gas sealed in the housing (100) is a mixed gas in which the composition of the flammable gas is 0, and the same effect can be realized.

[0153] Accordingly, the operation of the control unit according to the embodiments of the present invention may be applied even when the composition of the flammable gas is zero based on the combustion range triangle diagram, that is, even when it is shown on one edge of the triangle diagram and consists of a combustion-supporting gas (i.e., a mixed gas containing dry air or oxygen), an inert gas, or a mixed gas of a combustion-supporting gas and an inert gas.

[0154]

[0155] In describing the embodiments of the present invention described above, the specific description of each embodiment and the indication of specific components or descriptions in each drawing do not imply that such components or descriptions are necessarily included or excluded when applying each embodiment of the present invention, and the components and operating methods described above may be appropriately combined and modified to be applied in various ways.

[0156] As described above, embodiments according to the present invention have been examined. It is obvious to those skilled in the art that, in addition to the embodiments described above, the present invention may be embodied in other specific forms without departing from its spirit or scope. Therefore, the embodiments described above should be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the description above but may be modified within the scope of the appended claims and their equivalents.

[0157]

[0158] <Explanation of Symbols> 1: Gas-insulated power equipment, 100: Housing, 200: Arc extinguishing unit, 210: Primary pressure relief valve, 220: Primary discharge pipe, 230: Secondary pressure relief valve, 240: Secondary discharge pipe, 250: Buffer gas valve, 260: Discharge pipe pressure gauge, 270: Primary filter, 280: Secondary filter

Claims

1. A housing in which a device for power equipment is housed and in which insulating gas is sealed; and A gas-insulated power device comprising: an arc extinguishing unit coupled to the housing, which adjusts the component ratio of the insulating gas discharged from the housing and discharges it to the outside before discharging the insulating gas discharged to the outside in an abnormal state where the internal pressure of the housing rises abnormally.

2. In Claim 1, The above Soho section is, A primary pressure relief valve that discharges insulating gas from the housing to the arc extinguishing section when the internal pressure of the housing reaches the abnormal pressure of the housing; A primary discharge pipe that receives insulating gas discharged from the housing through the primary pressure relief valve before releasing it to the outside, and generates exhaust gas by changing the composition ratio of the insulating gas; and A gas-insulated power device comprising: a secondary pressure relief valve that discharges exhaust gas from the primary discharge pipe to the outside when the internal pressure of the primary discharge pipe reaches an abnormal pressure of the arc extinguishing section.

3. In Claim 2, The above Soho section is, A buffer gas valve for supplying buffer gas to the primary discharge pipe or discharging buffer gas from the primary discharge pipe; and A gas-insulated power device further comprising: a control unit for controlling the composition ratio of the buffer gas in the primary discharge pipe by adjusting the buffer gas valve according to the composition of the insulating gas to have a composition ratio in which the exhaust gas can be released into the atmosphere.

4. In Claim 2, The above Soho section is, A gas-insulated power device further comprising: a secondary exhaust pipe having a cross-sectional area smaller than that of the primary exhaust pipe and providing a path for discharging exhaust gas from the primary exhaust pipe to the outside through the secondary pressure relief valve.

5. In Claim 2, The above Soho section is, A gas-insulated power device further comprising a filter for filtering out foreign substances from exhaust gas discharged to the outside from the above-mentioned arc-extinguishing section.

6. In Claim 2, The above primary pressure relief valve is a gas-insulated power device that opens when an internal arc fault occurs in the housing.

7. In Claim 1, The above insulating gas is a mixture of flammable gas and non-flammable gas, and The above Soho section is, A gas-insulated power device further comprising: a control unit that mixes one or more of a flammable gas or a non-flammable gas with the insulating gas discharged from the housing to generate an exhaust gas in which the composition of the flammable gas falls within a range above the upper combustion limit or below the lower combustion limit.

8. In Claim 1, A gas-insulated power device in which the insulating gas is a mixed gas comprising one or more of a flammable gas, a combustion-supporting gas, and a non-combustible gas.

9. In Claim 1, A gas-insulated power device, wherein the insulating gas is a mixed gas comprising one or more selected from the group comprising dry air, carbon dioxide, carbon dioxide, and oxygen.

10. Housing normal pressure (P0) which is a pressure exceeding the ambient pressure (P0) in a housing in which a power equipment device is housed 1S In a method for controlling the withstand pressure of a gas-insulated power device filled with insulating gas, The internal pressure of the above housing is the normal pressure of the housing (P 1S Housing abnormal pressure (P) which is a pressure exceeding ) 1U When an abnormal condition is reached, insulating gas is discharged from the housing to the arc extinguishing section, and A method for controlling the internal pressure of a gas-insulated power device, wherein, in the above-mentioned arc-extinguishing section, the insulating gas discharged from the housing is discharged to the outside, the component ratio of the insulating gas is adjusted to generate the exhaust gas.

11. In Claim 10, In the above arc extinguishing section, the normal pressure of the arc extinguishing section (P1S) is a pressure greater than or equal to the ambient pressure (P0) and less than or equal to the normal pressure of the housing. 2S It is filled with buffer gas, and When insulating gas flows from the above housing into the arc extinguishing section, the buffer gas and insulating gas are mixed to generate exhaust gas, and A method for controlling the internal pressure of a gas-insulated power device, wherein the above exhaust gas is discharged to the outside from the arc extinguishing section.

12. In Claim 10, The above insulating gas is a mixture of flammable gas and non-flammable gas, and A method for controlling the internal pressure of a gas-insulated power device, wherein in the above-mentioned arc-extinguishing section, one or more of a flammable gas or a non-flammable gas are mixed with the insulating gas discharged from the housing to generate exhaust gas, and when the exhaust gas is discharged to the outside, the composition of the flammable gas falls within a range above the upper combustion limit or below the lower combustion limit.

13. In Claim 10, The insulating gas is a mixture of a flammable gas and a non-flammable gas, and is a mixture containing a low concentration of flammable gas in which the composition of the flammable gas is less than the composition of the non-flammable gas. A method for controlling the internal pressure of a gas-insulated power device, wherein in the above-mentioned arc-extinguishing section, a non-combustible gas is further mixed into the insulating gas to generate exhaust gas, and when the exhaust gas is discharged to the outside, the composition of the flammable gas falls within a range below the lower combustion limit.

14. In Claim 10, The insulating gas is a mixture of a flammable gas and a non-flammable gas, and is a mixture containing a high concentration of flammable gas in which the composition of the flammable gas is greater than the composition of the non-flammable gas. A method for controlling the internal pressure of a gas-insulated power device, wherein in the above-mentioned arc-extinguishing section, a flammable gas is further mixed into the insulating gas to generate exhaust gas, and when the exhaust gas is discharged to the outside, the composition of the flammable gas is greater than or equal to the combustion upper limit.

15. In Claim 10, A method for controlling the internal pressure of a gas-insulated power device, wherein the insulating gas is a mixed gas comprising one or more of a flammable gas, a combustion-supporting gas, and a non-combustible gas.

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