WO2020208737A1 - Pressure release device and gas insulated opening/closing device - Google Patents

Pressure release device and gas insulated opening/closing device Download PDF

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Publication number
WO2020208737A1
WO2020208737A1 PCT/JP2019/015597 JP2019015597W WO2020208737A1 WO 2020208737 A1 WO2020208737 A1 WO 2020208737A1 JP 2019015597 W JP2019015597 W JP 2019015597W WO 2020208737 A1 WO2020208737 A1 WO 2020208737A1
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WIPO (PCT)
Prior art keywords
pressure
pressure vessel
accident
vessel
internal
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PCT/JP2019/015597
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French (fr)
Japanese (ja)
Inventor
佳希 蒋
彰久 向田
Original Assignee
株式会社 東芝
東芝エネルギーシステムズ株式会社
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Application filed by 株式会社 東芝, 東芝エネルギーシステムズ株式会社 filed Critical 株式会社 東芝
Priority to PCT/JP2019/015597 priority Critical patent/WO2020208737A1/en
Publication of WO2020208737A1 publication Critical patent/WO2020208737A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect

Definitions

  • An embodiment of the present invention relates to a pressure release device and a gas-insulated switchgear.
  • a gas-insulated switchgear is a device in which a circuit breaker, disconnector, ground switchgear, etc. are connected by a conductor, and these devices are housed in a closed pressure vessel.
  • a pressure vessel As a pressure vessel, a pressure vessel made of cast aluminum may be used for the purpose of cost reduction. However, although this pressure vessel satisfies the standards of the International Electrotechnical Commission (IEC), it is fragile, and there is a risk that an accident may occur in which it is destroyed or scattered due to an excessive increase in internal pressure at the time of an accident.
  • IEC International Electrotechnical Commission
  • the main protection relay selects the accident point at high speed and cooperates with the circuit breaker to eliminate the accident with a minimum stop, and the back-up protection relay backs up when the accident cannot be eliminated by the main protective relay and the circuit breaker.
  • the back-up protection relay backs up when the accident cannot be eliminated by the main protective relay and the circuit breaker.
  • the conventional pressure release device aims to prevent the pressure vessel from breaking and scattering, no consideration was given to the relationship with accident elimination.
  • the pressure release device was activated much earlier than the pressure vessel was destroyed, and the decomposition gas generated in the pressure vessel was released due to the accident, causing further damage. That is, when the accident is eliminated, the pressure rise in the pressure vessel is suppressed, so that the decomposed gas is released even when the pressure vessel does not need to be opened, and the damage is expanded.
  • the embodiment of the present invention solves the above-mentioned problems, and can reduce the manufacturing cost of the gas-insulated switchgear while limiting the damage caused by the accident.
  • the purpose is to provide.
  • the pressure release device of the present embodiment is a pressure release device for a gas-insulated switching device having a pressure vessel made of a closed casting, and an accident occurs inside the pressure vessel. If this is the case, the internal pressure of the pressure vessel is higher than the internal pressure of the pressure vessel at the accident elimination time of the main protective relay, and the internal space of the pressure vessel is opened below the breaking limit pressure of the pressure vessel. It is characterized by doing.
  • gas-insulated switchgear of the present embodiment is characterized in that the pressure release device is provided.
  • FIG. 1 is a diagram in which the pressure release device according to the first embodiment is applied to a gas-insulated switchgear.
  • the gas-insulated switchgear is a device provided in the electric circuit of the electric power system to open and close the electric circuit.
  • a gas-insulated switchgear is a facility in which a circuit breaker and a disconnector are housed in a grounded airtight container and filled with insulating gas.
  • This gas-insulated switchgear includes a pressure vessel 1, a conductor 2, an insulating spacer 3, and a connecting conductor 4.
  • the pressure vessel 1 is a closed container made of casting.
  • the pressure vessel 1 is made of aluminum and satisfies the international standard (hereinafter referred to as IEC standard) established by the International Electrotechnical Commission.
  • IEC standard the international standard
  • the pressure vessel 1 houses a conductor 2, an insulating spacer 3, and a connecting conductor 4 inside, and the pressure vessel 1 is filled with an insulating gas having insulating and arc-extinguishing properties such as SF 6 gas.
  • the insulating gas in the pressure vessel 1 is pressurized to several atmospheres (here, 0.4 MPa-g).
  • the conductor 2 is a high-voltage conductor that constitutes an electric circuit of an electric power system.
  • the insulating spacer 3 is an insulating member made of a resin such as an epoxy resin, which separates the inside of the pressure vessel 1 and supports the conductor 2 in the pressure vessel 1.
  • An inner conductor 31 is embedded in the insulating spacer 3, and the inner conductor 31 is exposed in the internal spaces on both sides of the insulating spacer 3 divided by the insulating spacer 3 in the pressure vessel 1.
  • the inner conductor 31 is electrically connected to the conductor 2 via connecting conductors 4 provided on both sides thereof. That is, the electric circuit is composed of the conductor 2, the connecting conductor 4, and the inner conductor 31.
  • the above-mentioned circuit breaker and disconnector are provided in this electric circuit.
  • the pressure release device 10 of the present embodiment is a device provided in the pressure vessel 1 and releases the pressure in the pressure vessel 1.
  • the pressure release device 10 includes a branch portion 11, a pressure release plate 12, and a mounting plate 13 provided in the pressure vessel 1, and an accident occurs in the pressure vessel 1, and the pressure inside the pressure vessel 1 becomes a predetermined pressure.
  • the pressure release plate 12 is destroyed to release the internal pressure.
  • the branch portion 11 is a part of the pressure vessel 1 and is a cylindrical portion branched from the wall of the pressure vessel 1 made of cast aluminum.
  • An annular groove is provided at the tip of the branch portion 11, and an O-ring 11a is fitted in this groove.
  • the pressure release plate 12 is a stainless steel plate-like body here. However, the shape of the pressure release plate 12 may be a dome shape.
  • the pressure release plate 12 is destroyed at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay provided in the power system and below the fracture limit pressure of the pressure vessel 1. In order to make such adjustment, the pressure release plate 12 may be provided with a notch.
  • the operating range of the pressure release plate 12 is, for example, 4 MPa-g ⁇ 10%, assuming that the breaking limit pressure at which the pressure vessel 1 is destroyed due to an increase in the internal pressure of the pressure vessel 1 is 4.5 MPa-g.
  • the accident elimination time of the main protection relay is a predetermined fixed time from the detection of the accident by the main protection relay to the interruption by the circuit breaker commanded by the main protection relay.
  • the accident elimination time of the main protective relay is, for example, 0.5 s according to the JEC standard.
  • the pressure release plate 12 is provided on the branch portion 11 provided with the O-ring 11a. That is, the pressure release plate 12 is provided so as to close the hole of the cylindrical branch portion 11.
  • the mounting plate 13 is an annular plate that fixes the pressure release plate 12 to the branch portion 11. Specifically, the mounting plate 13 is placed on the pressure release plate 12 at the edge, and the bolts are inserted into the bolt holes provided in the mounting plate 13, the pressure release plate 12, and the branch portion 11 and fastened to release the bolts. The pressure plate 12 is fixed. As a result, the O-ring 11a is crushed between the pressure release plate 12 and the branch portion 11, and the pressure vessel 1 is hermetically sealed. The pressure release plate 12 is exposed to the inside of the pressure vessel 1 and also to the outside air. That is, the pressure release plate 12 separates the inside of the pressure vessel 1 from the outside air.
  • the protective relay installed in the power system detects the accident, the protective relay outputs a cutoff command to the circuit breaker, and the circuit breaker cuts off the electric circuit. As a result, it is possible to protect the area other than the accident section.
  • a main protective relay and a retrofit protective relay are provided in the power system.
  • the main protective relay selects the accident point at high speed and cooperates with the circuit breaker to eliminate the accident with the minimum necessary interruption.
  • the back-up protection relay is a backup in case the accident cannot be eliminated by the main protection relay. That is, the back-up protection relay is provided in a wider range after the accident is detected when the main protection relay malfunctions or does not operate, or when the main protection relay fails to eliminate the accident such as when the circuit breaker fails to shut off. A cutoff command is output to the relay.
  • ⁇ P C ⁇ (I ⁇ t / V) ⁇ 0.098... (1)
  • ⁇ P is the gas pressure change (MPa—g) in the pressure vessel 1
  • C is the coefficient (0.35 in the case of a three-phase power system, 0.3 in the case of a single-phase power system)
  • I is.
  • t is the accident elimination time (ms)
  • V is the volume (L) of the pressure vessel 1.
  • FIG. 2 is a diagram showing the operating region of the pressure release device 10 according to the first embodiment in a time characteristic graph of the pressure in the pressure vessel at the time of an accident.
  • the pressure release plate 12 opens the pressure vessel 1 by breaking at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and below the breaking limit pressure of the pressure vessel 1. Therefore, the pressure vessel 1 itself can be prevented from being destroyed or scattered. Therefore, even if an inexpensive cast pressure vessel satisfying the IEC standard is used as the pressure vessel 1, the strength of the pressure vessel 1 and the pressure release device 10 can be emphasized.
  • the pressure release device 10 does not operate until the accident removal time of the main protective relay, it is possible to prevent the decomposition gas in the pressure vessel 1 generated by the accident from being released into the atmosphere until that time, and the damage of the accident can be prevented. Can be limited.
  • the operating range of the pressure release plate 12 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and less than the breaking limit pressure of the pressure vessel 1, for example, a stainless steel release plate 12 is used.
  • the pressure P 3.3 MPa-g in the pressure vessel 1 at the accident elimination time of the main protective relay is the pressure release plate 12. It is below the lower limit of 3.6 MPa-g in the operating range, and it is possible to prevent the release of unnecessary decomposition gas.
  • the pressure release device 10 of the present embodiment is a pressure release device for a gas-insulated switching device having a pressure vessel 1 made of a closed casting, and when an accident occurs inside the pressure vessel 1, the pressure vessel 1 The internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay, and the pressure vessel 1 is opened below the breaking limit pressure of the pressure vessel 1.
  • the pressure release device 10 is provided with a branch portion 11 provided in the pressure vessel 1 and a pressure release plate 12 provided in the branch portion 12.
  • the manufacturing cost of the gas-insulated switchgear can be reduced while limiting the damage caused by the accident. That is, since the pressure release device 10 does not operate until the accident removal time of the main protective relay, it is possible to prevent unnecessary release of the decomposed gas into the atmosphere and limit the damage caused by the accident. On the other hand, even if the pressure continues to rise due to the non-operation of the main protective relay or the like even after the accident elimination time of the main protective relay, the pressure release device 10 operates until the internal pressure of the pressure vessel 1 reaches the breaking limit pressure. Even if an inexpensive IEC standard pressure vessel 1 is used, it is possible to prevent the pressure vessel 1 from being destroyed and scattered, and it is possible to reduce the manufacturing cost of the gas-insulated switching device.
  • the pressure release plate 12 of the present embodiment is made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel.
  • a brittle material epoxy resin, ceramics, or glass can be used.
  • the fracture toughness of stainless steel is, for example, 30 to 300 MPam 1/2 . Therefore, the fracture toughness of the brittle material of the pressure release plate 12 of the present embodiment is 0.3 to 30 MPam 1/2 .
  • FIG. 3 is a diagram showing the operating region of the pressure release device according to the second embodiment in a time characteristic graph of the pressure in the pressure vessel at the time of an accident.
  • the pressure release plate 12 provided in the pressure vessel 1 is made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel.
  • the pressure release device 10 is operated within a range higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the retrofit protection relay and less than the fracture limit pressure of the pressure vessel 1, that is, The pressure release plate 12 can be destroyed to open the internal space of the pressure vessel 1.
  • the pressure vessel 12 bulges outward in a dome shape in response to the internal pressure, and cannot withstand the swelling and is torn.
  • the pressure release plate 12 is made of stainless steel, it takes time from the expansion of the pressure release plate 12 to the tearing because the viscosity of the stainless steel itself is relatively high at the time of this swelling.
  • the pressure release plate 12 is made of the above-mentioned brittle material, the viscosity of the brittle material is smaller than that of stainless steel due to its small fracture toughness, and the time from swelling of the pressure release plate 12 to tearing is short. .. Therefore, the operating range of the pressure release device 10 can be narrowed.
  • the operating range of the pressure release device 10 using the stainless steel pressure release plate 12 is within a width of ⁇ 10% of the median value (for example, 4.5 MPam 1/2 ), whereas it is made of a brittle material.
  • the operating range of the pressure release device 10 using the pressure release plate 12 can be a range of ⁇ 1% of the median value, and the range of the width from the median value can be narrowed.
  • the pressure vessel 1 can be operated in a range higher than the internal pressure of the pressure vessel 1 at 2.0 s) and less than the breaking limit pressure of the pressure vessel 1.
  • JEC-2350: 2016 “must withstand the increase in gas pressure until the failure elimination time by the main protective relay. (The meaning of withstanding the pressure increase due to an internal failure does not have the effect of suppressing the pressure increase of the pressure release device or the like. In this case, it means that there is no gas leak to the outside during the failure and after the failure is removed.) ”, But also the deformation of the pressure vessel 1 and the release of the internal gas to the atmosphere within the accident removal time by the protective relay. It is possible to satisfy the request of the user who wants to prevent. In other words, the pressure release device 10 of the present embodiment does not operate until the accident removal time of the protective relay, so that the decomposition gas in the pressure vessel 1 generated by the accident is released to the atmosphere until that time. It can be prevented and the damage caused by the accident can be limited.
  • FIG. 4 is a diagram in which the pressure release device according to the third embodiment is applied to a gas-insulated switchgear. As shown in FIG. 4, a part of the insulating spacer 3 is thinner than the other parts. This thin portion is the pressure release device 10 of the present embodiment. This thin portion may be provided as one or more recesses, or may be provided in an annular shape.
  • the insulating spacer 3 is made of, for example, an epoxy resin, and the thin portion is higher than the internal pressure of the pressure vessel 1 at the accident removal time of the main protective relay and is destroyed below the breaking limit pressure of the pressure vessel 1. Will be done.
  • the thin portion may be made of a brittle material such as an epoxy resin having a fracture toughness of 1/100 to 1/10 of stainless steel.
  • the pressure release device 10 having the pressure release plate 12 or the like of the first embodiment does not necessarily have to be provided.
  • the pressure release device 10 of the present embodiment when a part of the insulating spacer 3 that divides the inside of the pressure vessel 1 is thinner than the other parts and an accident occurs inside the pressure vessel 1, the internal pressure of the pressure vessel 1 However, the internal space of the pressure vessel 1 is opened at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and below the breaking limit pressure of the pressure vessel 1. As a result, as in the first embodiment, the pressure release device 10 does not operate until the accident removal time of the main protective relay, so that the damage caused by the accident can be limited.
  • the pressure release device 10 operates until the internal pressure of the pressure vessel 1 reaches the breaking limit pressure. Even if an inexpensive IEC standard pressure vessel 1 is used, it is possible to prevent the pressure vessel 1 from being destroyed and scattered, and it is possible to reduce the manufacturing cost of the gas-insulated switching device.
  • the insulating spacer 3 is made of an epoxy resin, the thin portion that is a part of the insulating spacer 3 is higher than the internal pressure of the pressure vessel 1 at the accident removal time of the retrofit protection relay, and the pressure vessel 1 has a thin portion. Since the gas is destroyed within the range below the breaking limit pressure, the gas can escape to the adjacent section in the pressure vessel 1, so that the pressure vessel 1 is the section where the pressure is increased without releasing the gas in the atmosphere. The internal space can be opened. As a result, the safety of the inspector of the gas-insulated switchgear can be ensured, and the release of environmentally harmful insulating gas and decomposed gas to the atmosphere can be prevented.
  • the accident elimination time of the back-up protection relay is a predetermined fixed time from the time when the back-up protection relay detects an accident to the time when the circuit breaker commanded by the back-up protection relay shuts off.
  • the accident elimination time of the protective relay is, for example, 2.0 s according to the JEC standard.
  • FIG. 5 is a diagram in which the pressure release device according to the fourth embodiment is applied to a gas-insulated switchgear.
  • a part of the inner conductor 31 embedded in the insulating spacer 3 is thinner than the other part.
  • This thin portion is the pressure release device 10 of the present embodiment.
  • This thin portion can be provided as a recess.
  • the thin portion is exposed in the adjacent space divided by the insulating spacer 3 of the pressure vessel 1, and the internal conductor 31 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and , It is composed of a conductive material that breaks below the breaking limit pressure of the pressure vessel 1.
  • the inner conductor 31 can be made of, for example, metal.
  • the pressure release device 10 having the pressure release plate 12 or the like of the first embodiment does not necessarily have to be provided.
  • the pressure release device 10 of the present embodiment when a part of the internal conductor 31 embedded in the insulating spacer 3 is thinner than the other parts and an accident occurs inside the pressure vessel 1, the internal pressure of the pressure vessel 1 However, the internal space of the pressure vessel 1 is opened at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and below the breaking limit pressure of the pressure vessel 1. As a result, as in the first embodiment, the pressure release device 10 does not operate until the accident removal time of the main protective relay, so that the damage caused by the accident can be limited.
  • the pressure release device 10 operates until the internal pressure of the pressure vessel 1 reaches the breaking limit pressure. Even if an inexpensive IEC standard pressure vessel 1 is used, it is possible to prevent the pressure vessel 1 from being destroyed and scattered, and it is possible to reduce the manufacturing cost of the gas-insulated switching device.
  • the inside of the pressure vessel 1 is destroyed. Since the gas can be released to the adjacent section of the pressure vessel 1, the internal space of the pressure vessel 1 which is the section where the pressure is increased can be opened without releasing the gas in the atmosphere. As a result, the safety of the inspector of the gas-insulated switchgear can be ensured, and the release of environmentally harmful insulating gas and decomposed gas to the atmosphere can be prevented.
  • the pressure release device 10 may be provided as an accessory component of the gas-insulated switchgear.
  • this accessory is a product whose main purpose is not to seal or release gas.
  • a manhole part for work can be mentioned.
  • FIG. 6 is a diagram in which the pressure release device according to another embodiment is applied to the insulating portion of the ground terminal of the gas-insulated switchgear.
  • the pressure vessel 1 is provided with a ground terminal 5.
  • the ground terminal 5 is a conductor that grounds the conductor 2 in the pressure vessel 1, and becomes conductive to the conductor 2 when the ground switch provided in the gas-insulated switch is turned on. That is, the ground terminal 5 is electrically connected to the rod 53 of the ground switch via a shunt 52 which is a metal plate, and the rod 53 slides and the tip of the rod 53 is electrically connected to the conductor 2.
  • the ground terminal 5 and the conductor 2 are electrically connected, and the conductor 2 is in a grounded state.
  • the grounding terminal 5 is provided so as to penetrate the wall of the pressure vessel 1, and the pressure vessel 1 is sealed by an insulating portion 51 provided on the body of the grounding terminal 5, and the grounding terminal 5 is supported.
  • a ground terminal 5 connected to a conductor 2 serving as an electric circuit provided inside the pressure vessel 1 is embedded, and the pressure vessel 1 and the ground terminal 5 are insulated and the pressure vessel 1 is sealed. Stop.
  • the insulating portion 51 is integrally molded with, for example, the ground terminal 5 and an epoxy resin or the like. Assuming that the ground terminal 5 is cylindrical, the insulating portion 51 is, for example, cylindrical.
  • a part of the insulating part 51 is thinner than the other parts, and this thin part can be used as the pressure release device 10. That is, this thin portion is destroyed in a range where the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1.
  • the pressure release device 10 is not operated until the accident removal time of the main protection relay, the accident damage is limited, and the pressure continues to rise due to the non-operation of the main protection relay after that time.
  • the internal space of the pressure vessel 1 can be opened to prevent the pressure vessel 1 from being destroyed.
  • FIG. 7 is a diagram in which the pressure release device according to another embodiment is applied to the viewing window of the gas-insulated switchgear.
  • the viewing window 6 is an accessory component for monitoring the inside of the pressure vessel 1 provided in the pressure vessel 1.
  • the viewing window 6 is made of a transparent material, and here it is made of glass.
  • the viewing window 6 has a thickness of, for example, less than 50 mm.
  • the viewing window 6 is destroyed because the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1. , If the pressure release device 10 is not operated until the accident removal time of the main protection relay, the accident damage is limited, and the pressure continues to rise due to the non-operation of the main protection relay after that time, the pressure vessel The internal space of 1 is opened to prevent the pressure vessel 1 from being destroyed.
  • the viewing window 6 may be provided with an openable / closable lid made of metal or the like. As a result, the lid is closed except when monitoring the inside of the pressure vessel 1, so even if the glass viewing window 6 is destroyed due to an accident, it is possible to prevent the fragments from scattering.
  • the viewing window 6 may be made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel, as in the second embodiment.
  • FIG. 8 is a diagram in which the pressure release device according to another embodiment is applied to the adsorption device of the gas-insulated switchgear.
  • the adsorption device 7 is provided in the pressure vessel 1 and adsorbs the decomposition gas or water generated in the event of an accident.
  • the adsorption device 7 has a box 70 containing an adsorbent for adsorbing decomposition gas or water, and a fixing plate 71 provided in the pressure vessel 1 for fixing the box 70 to the pressure vessel 1.
  • the box 70 is provided with a plurality of holes so that decomposition gas or water can enter.
  • the adsorbent a known one can be used.
  • the fixing plate 71 is made of a metal such as stainless steel, and airtightly closes the hole of the pressure vessel 1.
  • the fixing plate 71 is destroyed in a range where the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1. That is, the fixing plate 71 can also be used as the pressure release plate 12. As a result, even if an internal accident occurs in the pressure vessel 1, the internal pressure of the pressure vessel 1 of the fixing plate 71 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protection relay, and the pressure is high.
  • the pressure release device 10 Since the vessel 1 is destroyed within the range below the breaking limit pressure, the pressure release device 10 is not operated until the accident removal time of the main protection relay, and the accident damage is limited after that time. When the pressure continues to rise due to a malfunction such as, the internal space of the pressure vessel 1 can be opened to prevent the pressure vessel 1 from being destroyed.
  • FIG. 9 is a diagram in which the pressure release device according to another embodiment is applied to the working manhole portion of the gas-insulated switchgear.
  • the manhole portion 8 is a carry-in / carry-out outlet for providing a member such as a conductor 2 serving as a detachable bus in the pressure vessel 1, and is a tubular branch formed by branching from the pressure vessel 1.
  • a portion 81 and a lid 82 that airtightly closes the opening of the branch portion 81 are provided.
  • the lid 82 can also be used as the pressure release plate 12.
  • the lid 82 is destroyed in a range where the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1.
  • the pressure release device 10 is not operated until the accident removal time of the main protective relay, the accident damage is limited, and the pressure continues to rise due to the non-operation of the main protective relay or the like after that time.
  • the internal space of the pressure vessel 1 can be opened to prevent the pressure vessel 1 from being destroyed.
  • the branching (that is, the branching portion 11) of the pressure vessel 1 for providing the pressure releasing device 10 can be reduced, and the material processing cost can be reduced. Can be planned. Further, by using the pressure release plate 12 as a part of the accessory parts, a separate mounting plate 13 or the like is not required, and the number of parts can be reduced, the parts cost can be reduced, and the working time can be shortened.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

Provide are: a pressure release device which can limit the damage from an accident and with which the cost of manufacturing a gas insulated opening/closing device can be reduced; and a gas insulated opening/closing device. The pressure release device is for use in the gas insulated opening/closing device that includes a pressure vessel 1 which is a cast object and which is sealed. The gas insulated opening/closing device includes the pressure vessel 1 which is a cast object and which is sealed, and in a case where an accident occurs inside the pressure vessel 1, the device opens the pressure vessel 1 if the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the time of an accident-clearance of a main protective relay and is less than a destruction-limiting pressure of the pressure vessel 1.

Description

放圧装置及びガス絶縁開閉装置Pressure release device and gas insulation switchgear
　本発明の実施形態は、放圧装置及びガス絶縁開閉装置に関する。 An embodiment of the present invention relates to a pressure release device and a gas-insulated switchgear.
　ガス絶縁開閉装置は、遮断器、断路器、接地開閉器等を導体で接続した機器であり、これらの機器は密閉された圧力容器に収容される。事故の発生により圧力容器内でアークの発生を伴う内部事故が発生した場合には、アークのエネルギーにより圧力容器内部の圧力が急上昇する。 A gas-insulated switchgear is a device in which a circuit breaker, disconnector, ground switchgear, etc. are connected by a conductor, and these devices are housed in a closed pressure vessel. When an internal accident involving the generation of an arc occurs in the pressure vessel due to the occurrence of an accident, the pressure inside the pressure vessel rises sharply due to the energy of the arc.
特開２０１５－２２６４３６号公報Japanese Unexamined Patent Publication No. 2015-226436
　圧力容器として、コストダウンを目的としてアルミ鋳物製の圧力容器を用いることがある。しかし、この圧力容器は、国際電気標準会議（ＩＥＣ）の規格を満足しているものの、脆弱であり、事故時の過大な内部圧力の上昇により、破壊、飛散する事故が発生する虞がある。 As a pressure vessel, a pressure vessel made of cast aluminum may be used for the purpose of cost reduction. However, although this pressure vessel satisfies the standards of the International Electrotechnical Commission (IEC), it is fragile, and there is a risk that an accident may occur in which it is destroyed or scattered due to an excessive increase in internal pressure at the time of an accident.
　圧力容器の破壊、飛散を防止するため、圧力容器の板厚を厚くしたり、容積を大きくしたりするなど、圧力容器の強度に裕度を持たせることが考えられる。しかし、コストが増大することになり、安価であるアルミ鋳物製の圧力容器のメリットを享受できない場合があった。そこで、従来から、圧力容器の強度に裕度を持たせる代わりに、圧力容器に放圧装置を設け、圧力容器が破壊されるまでに放圧装置を作動させ、圧力容器を開放する技術が採用されていた。これにより、圧力容器が安価なものを用いるメリットを享受していた。 In order to prevent the pressure vessel from being destroyed or scattered, it is conceivable to increase the strength of the pressure vessel by increasing the plate thickness or volume of the pressure vessel. However, the cost increases, and there are cases where the advantage of the inexpensive cast aluminum pressure vessel cannot be enjoyed. Therefore, conventionally, instead of giving a margin to the strength of the pressure vessel, a technology has been adopted in which a pressure release device is provided in the pressure vessel, the pressure release device is operated before the pressure vessel is destroyed, and the pressure vessel is opened. It had been. As a result, they enjoyed the merit of using an inexpensive pressure vessel.
　ところで、事故が発生すると、電力系統に設けられた主保護継電器及び後備保護継電器により事故を検知し、遮断器により事故除去がなされる。主保護継電器は、高速に事故点を選択し、遮断器と連携として最小限の停止で事故除去を行い、後備保護継電器は、主保護継電器と遮断器により事故除去ができなかった場合に、バックアップとして、事故をより確実に除去するために、広い範囲で遮断器により事故除去する。このように、事故の波及を阻止していた。 By the way, when an accident occurs, the accident is detected by the main protection relay and the back protection relay provided in the power system, and the accident is eliminated by the circuit breaker. The main protective relay selects the accident point at high speed and cooperates with the circuit breaker to eliminate the accident with a minimum stop, and the back-up protection relay backs up when the accident cannot be eliminated by the main protective relay and the circuit breaker. As a result, in order to remove the accident more reliably, the accident is removed by a relay in a wide range. In this way, the spread of the accident was prevented.
　従来の放圧装置は、圧力容器の破壊、飛散防止を目的とするため、事故除去との関係は何ら考慮されていなかった。圧力容器が破壊されるよりもかなり早い段階で放圧装置が作動し、事故により圧力容器内で発生した分解ガスが放出され、被害が拡大する事態となっていた。すなわち、事故が除去されると、圧力容器内の圧力上昇が抑えられるため、圧力容器の開放の必要がない場合も分解ガスが放出されることになり、被害が拡大する事態となっていた。 Since the conventional pressure release device aims to prevent the pressure vessel from breaking and scattering, no consideration was given to the relationship with accident elimination. The pressure release device was activated much earlier than the pressure vessel was destroyed, and the decomposition gas generated in the pressure vessel was released due to the accident, causing further damage. That is, when the accident is eliminated, the pressure rise in the pressure vessel is suppressed, so that the decomposed gas is released even when the pressure vessel does not need to be opened, and the damage is expanded.
　本発明の実施形態は、上記のような問題を解決するものであり、事故の被害を限定的にしつつも、ガス絶縁開閉装置の製造コストを低減することのできる放圧装置及びガス絶縁開閉装置を提供することを目的とする。 The embodiment of the present invention solves the above-mentioned problems, and can reduce the manufacturing cost of the gas-insulated switchgear while limiting the damage caused by the accident. The purpose is to provide.
　上記の目的を達成するために、本実施形態の放圧装置は、密閉された鋳物製の圧力容器を有するガス絶縁開閉装置用の放圧装置であって、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放すること、を特徴とする。 In order to achieve the above object, the pressure release device of the present embodiment is a pressure release device for a gas-insulated switching device having a pressure vessel made of a closed casting, and an accident occurs inside the pressure vessel. If this is the case, the internal pressure of the pressure vessel is higher than the internal pressure of the pressure vessel at the accident elimination time of the main protective relay, and the internal space of the pressure vessel is opened below the breaking limit pressure of the pressure vessel. It is characterized by doing.
　また、本実施形態のガス絶縁開閉装置は、前記放圧装置が設けられたこと、を特徴とする。 Further, the gas-insulated switchgear of the present embodiment is characterized in that the pressure release device is provided.
第１実施形態に係る放圧装置をガス絶縁開閉装置に適用した図である。It is a figure which applied the pressure release device which concerns on 1st Embodiment to a gas insulation switchgear. 第１実施形態に係る放圧装置の作動領域を事故時の圧力容器内の圧力の時間特性グラフに示した図である。It is a figure which showed the operating area of the pressure release device which concerns on 1st Embodiment in the time characteristic graph of the pressure in the pressure vessel at the time of an accident. 第２実施形態に係る放圧装置の作動領域を事故時の圧力容器内の圧力の時間特性グラフに示した図である。It is a figure which showed the operating area of the pressure release device which concerns on 2nd Embodiment in the time characteristic graph of the pressure in the pressure vessel at the time of an accident. 第３実施形態に係る放圧装置をガス絶縁開閉装置に適用した図である。It is a figure which applied the pressure release device which concerns on 3rd Embodiment to a gas insulation switchgear. 第４実施形態に係る放圧装置をガス絶縁開閉装置に適用した図である。It is a figure which applied the pressure release device which concerns on 4th Embodiment to a gas insulation switchgear. 他の実施形態に係る放圧装置をガス絶縁開閉装置の接地端子の絶縁部に適用した図である。It is a figure which applied the pressure release device which concerns on another Embodiment to the insulation part of the ground terminal of a gas insulation switchgear. 他の実施形態に係る放圧装置をガス絶縁開閉装置の覗き窓に適用した図である。It is a figure which applied the pressure release device which concerns on other embodiment to the viewing window of a gas insulation switchgear. 他の実施形態に係る放圧装置をガス絶縁開閉装置の吸着装置に適用した図である。It is a figure which applied the pressure release device which concerns on other embodiment to the adsorption device of a gas insulation switchgear. 他の実施形態に係る放圧装置をガス絶縁開閉装置の作業用のマンホール部に適用した図である。It is a figure which applied the pressure release device which concerns on other embodiment to the manhole part for work of a gas insulation switchgear.
　（第１実施形態）
　（構成）
　図１は、第１実施形態に係る放圧装置をガス絶縁開閉装置に適用した図である。ガス絶縁開閉装置は、電力系統の電路に設けられ、電路を開閉する装置である。ガス絶縁開閉装置は、遮断器、断路器を接地された密閉容器に収容し、絶縁性ガスを充填した設備である。このガス絶縁開閉装置は、圧力容器１、導体２、絶縁スペーサ３、接続導体４を備える。 (First Embodiment)
(Constitution)
FIG. 1 is a diagram in which the pressure release device according to the first embodiment is applied to a gas-insulated switchgear. The gas-insulated switchgear is a device provided in the electric circuit of the electric power system to open and close the electric circuit. A gas-insulated switchgear is a facility in which a circuit breaker and a disconnector are housed in a grounded airtight container and filled with insulating gas. This gas-insulated switchgear includes a pressure vessel 1, a conductor 2, an insulating spacer 3, and a connecting conductor 4.
　圧力容器１は、鋳物製の密閉容器である。ここでは、圧力容器１は、アルミニウムにより構成されており、国際電気標準会議が制定する国際規格（以下、ＩＥＣ規格という。）を満たす。圧力容器１は、導体２、絶縁スペーサ３、接続導体４を内部に収容するとともに、圧力容器１には、ＳＦ６ガスなど絶縁性及び消弧性を有する絶縁ガスが封入されている。絶縁強度を高めるために、圧力容器１内の絶縁ガスは、数気圧（ここでは、０．４ＭＰａ－ｇ）に加圧されている。 The pressure vessel 1 is a closed container made of casting. Here, the pressure vessel 1 is made of aluminum and satisfies the international standard (hereinafter referred to as IEC standard) established by the International Electrotechnical Commission. The pressure vessel 1 houses a conductor 2, an insulating spacer 3, and a connecting conductor 4 inside, and the pressure vessel 1 is filled with an insulating gas having insulating and arc-extinguishing properties such as SF 6 gas. In order to increase the dielectric strength, the insulating gas in the pressure vessel 1 is pressurized to several atmospheres (here, 0.4 MPa-g).
　導体２は、電力系統の電路を構成する高圧導体である。絶縁スペーサ３は、エポキシ樹脂などの樹脂により構成され、圧力容器１の内部を区分けするとともに、導体２を圧力容器１内で支持する絶縁部材である。絶縁スペーサ３には、内部導体３１が埋設されており、内部導体３１は、圧力容器１内の絶縁スペーサ３が区分した絶縁スペーサ３の両側の内部空間に露出している。内部導体３１は、その両側に設けられた接続導体４を介して導体２と電気的に接続されている。すなわち、導体２、接続導体４、及び内部導体３１によって電路を構成する。上記の遮断器、断路器は、この電路に設けられる。 The conductor 2 is a high-voltage conductor that constitutes an electric circuit of an electric power system. The insulating spacer 3 is an insulating member made of a resin such as an epoxy resin, which separates the inside of the pressure vessel 1 and supports the conductor 2 in the pressure vessel 1. An inner conductor 31 is embedded in the insulating spacer 3, and the inner conductor 31 is exposed in the internal spaces on both sides of the insulating spacer 3 divided by the insulating spacer 3 in the pressure vessel 1. The inner conductor 31 is electrically connected to the conductor 2 via connecting conductors 4 provided on both sides thereof. That is, the electric circuit is composed of the conductor 2, the connecting conductor 4, and the inner conductor 31. The above-mentioned circuit breaker and disconnector are provided in this electric circuit.
　本実施形態の放圧装置１０は、圧力容器１に設けられ、圧力容器１内の圧力を開放する装置である。ここでは、放圧装置１０は、圧力容器１に設けられた分岐部１１、放圧板１２、取付板１３を備え、圧力容器１内で事故が発生し、圧力容器１内部の圧力が所定の圧力領域になった場合に、放圧板１２が破壊されることで内部の圧力を開放する。 The pressure release device 10 of the present embodiment is a device provided in the pressure vessel 1 and releases the pressure in the pressure vessel 1. Here, the pressure release device 10 includes a branch portion 11, a pressure release plate 12, and a mounting plate 13 provided in the pressure vessel 1, and an accident occurs in the pressure vessel 1, and the pressure inside the pressure vessel 1 becomes a predetermined pressure. When the area is reached, the pressure release plate 12 is destroyed to release the internal pressure.
　具体的には、分岐部１１は、圧力容器１の一部であり、アルミ鋳物製の圧力容器１の壁から分岐した円筒状の部位である。分岐部１１の先端には、環状の溝が設けられており、この溝にＯリング１１ａが嵌合されている。 Specifically, the branch portion 11 is a part of the pressure vessel 1 and is a cylindrical portion branched from the wall of the pressure vessel 1 made of cast aluminum. An annular groove is provided at the tip of the branch portion 11, and an O-ring 11a is fitted in this groove.
　放圧板１２は、ここではステンレス製の板状体である。但し、放圧板１２の形状はドーム状としても良い。放圧板１２は、電力系統に設けられた主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で破壊される。このように調整するために、放圧板１２に切り込みが設けられていても良い。放圧板１２の作動範囲は、例えば、圧力容器１の内部圧力が上昇したことにより圧力容器１が破壊される破壊限界圧力が４．５ＭＰａ－ｇとすると、４ＭＰａ－ｇ±１０％である。なお、主保護継電器の事故除去時間とは、主保護継電器が事故を検知してから当該主保護継電器により指令を受けた遮断器が遮断するまでの予め定められた一定時間である。主保護継電器の事故除去時間は、例えば、ＪＥＣ規格では、０．５ｓである。 The pressure release plate 12 is a stainless steel plate-like body here. However, the shape of the pressure release plate 12 may be a dome shape. The pressure release plate 12 is destroyed at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay provided in the power system and below the fracture limit pressure of the pressure vessel 1. In order to make such adjustment, the pressure release plate 12 may be provided with a notch. The operating range of the pressure release plate 12 is, for example, 4 MPa-g ± 10%, assuming that the breaking limit pressure at which the pressure vessel 1 is destroyed due to an increase in the internal pressure of the pressure vessel 1 is 4.5 MPa-g. The accident elimination time of the main protection relay is a predetermined fixed time from the detection of the accident by the main protection relay to the interruption by the circuit breaker commanded by the main protection relay. The accident elimination time of the main protective relay is, for example, 0.5 s according to the JEC standard.
　放圧板１２は、Ｏリング１１ａが設けられた分岐部１１の上に設けられている。すなわち、放圧板１２は、円筒形状の分岐部１１の孔を塞ぐように設けられている。 The pressure release plate 12 is provided on the branch portion 11 provided with the O-ring 11a. That is, the pressure release plate 12 is provided so as to close the hole of the cylindrical branch portion 11.
　取付板１３は、放圧板１２を分岐部１１に固定する円環板である。具体的には、取付板１３は、放圧板１２に縁部に載置され、取付板１３、放圧板１２、分岐部１１に設けられたボルト孔にボルトが挿入され、締結されることで放圧板１２を固定する。これにより、放圧板１２と分岐部１１との間でＯリング１１ａが潰されて圧力容器１が気密を保って密閉される。放圧板１２は、圧力容器１の内部に露出するとともに、外気にも露出する。つまり、放圧板１２は、圧力容器１内部と外気とを仕切る。 The mounting plate 13 is an annular plate that fixes the pressure release plate 12 to the branch portion 11. Specifically, the mounting plate 13 is placed on the pressure release plate 12 at the edge, and the bolts are inserted into the bolt holes provided in the mounting plate 13, the pressure release plate 12, and the branch portion 11 and fastened to release the bolts. The pressure plate 12 is fixed. As a result, the O-ring 11a is crushed between the pressure release plate 12 and the branch portion 11, and the pressure vessel 1 is hermetically sealed. The pressure release plate 12 is exposed to the inside of the pressure vessel 1 and also to the outside air. That is, the pressure release plate 12 separates the inside of the pressure vessel 1 from the outside air.
　（作用）
　まず、事故発生から事故除去について説明し、本実施形態の放圧装置１１の作用を説明する。 (Action)
First, the accident elimination from the occurrence of an accident will be described, and the operation of the pressure release device 11 of the present embodiment will be described.
　一般に、事故が発生すると、電力系統に設けられた保護継電器により事故が検知され、保護継電器は遮断器に遮断指令を出力し、遮断器が電路を遮断する。これにより、事故区間以外の領域を保護することができる。 Generally, when an accident occurs, the protective relay installed in the power system detects the accident, the protective relay outputs a cutoff command to the circuit breaker, and the circuit breaker cuts off the electric circuit. As a result, it is possible to protect the area other than the accident section.
　保護継電器としては、主保護継電器と後備保護継電器とが電力系統に設けられている。主保護継電器は、高速に事故点を選択し、遮断器と連携して必要最低限の遮断で事故除去を行う。後備保護継電器は、主保護継電器により事故除去ができなかった場合のバックアップである。すなわち、後備保護継電器は、主保護継電器が誤動作若しくは不動作の場合、又は、遮断器が遮断に失敗した場合など主保護継電器により事故除去できなかった場合に、事故検知後、より広い範囲に設けた遮断器に遮断指令を出力する。 As a protective relay, a main protective relay and a retrofit protective relay are provided in the power system. The main protective relay selects the accident point at high speed and cooperates with the circuit breaker to eliminate the accident with the minimum necessary interruption. The back-up protection relay is a backup in case the accident cannot be eliminated by the main protection relay. That is, the back-up protection relay is provided in a wider range after the accident is detected when the main protection relay malfunctions or does not operate, or when the main protection relay fails to eliminate the accident such as when the circuit breaker fails to shut off. A cutoff command is output to the relay.
　ここで、事故の発生により圧力容器１内でアークを伴う事故（以下、内部事故ともいう。）が発生すると、アークのエネルギーにより圧力容器１内の圧力が急上昇する。内部事故が発生したときの圧力容器１の圧力上昇ΔＰは、式（１）により表される。 Here, when an accident involving an arc occurs in the pressure vessel 1 due to the occurrence of an accident (hereinafter, also referred to as an internal accident), the pressure in the pressure vessel 1 suddenly rises due to the energy of the arc. The pressure rise ΔP of the pressure vessel 1 when an internal accident occurs is expressed by the equation (1).
　ΔＰ＝Ｃ×（Ｉ×ｔ／Ｖ）×０．０９８　　…（１）
　ここで、ΔＰは、圧力容器１内のガス圧力変化（ＭＰａ－ｇ）、Ｃは、係数（三相電力系統の場合は０．３５、単相電力系統の場合は０．３）、Ｉは、故障電流（Ａ）、ｔは、事故除去時間（ｍｓ）、Ｖは、圧力容器１の容積（Ｌ）である。 ΔP = C × (I × t / V) × 0.098… (1)
Here, ΔP is the gas pressure change (MPa—g) in the pressure vessel 1, C is the coefficient (0.35 in the case of a three-phase power system, 0.3 in the case of a single-phase power system), and I is. , Failure current (A), t is the accident elimination time (ms), and V is the volume (L) of the pressure vessel 1.
　図２は、第１実施形態に係る放圧装置１０の作動領域を事故時の圧力容器内の圧力の時間特性グラフに示した図である。図２に示すように、放圧板１２は、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で破壊により圧力容器１を開放するので、圧力容器１自体の破壊、飛散が防止できる。そのため、ＩＥＣ規格を満たす安価な鋳物製の圧力容器を圧力容器１として使用しても、圧力容器１と放圧装置１０との強度強調を図ることができる。また、主保護継電器の事故除去時間までは放圧装置１０が作動しないので、その時間まで、事故により発生した圧力容器１内の分解ガスを大気中に放出することを防止でき、事故の被害を限定的にすることができる。 FIG. 2 is a diagram showing the operating region of the pressure release device 10 according to the first embodiment in a time characteristic graph of the pressure in the pressure vessel at the time of an accident. As shown in FIG. 2, the pressure release plate 12 opens the pressure vessel 1 by breaking at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and below the breaking limit pressure of the pressure vessel 1. Therefore, the pressure vessel 1 itself can be prevented from being destroyed or scattered. Therefore, even if an inexpensive cast pressure vessel satisfying the IEC standard is used as the pressure vessel 1, the strength of the pressure vessel 1 and the pressure release device 10 can be emphasized. Further, since the pressure release device 10 does not operate until the accident removal time of the main protective relay, it is possible to prevent the decomposition gas in the pressure vessel 1 generated by the accident from being released into the atmosphere until that time, and the damage of the accident can be prevented. Can be limited.
　具体的には、放圧装置１０を、定格電圧１６８ｋＶ、定格ガス圧０．６ＭＰａの三相の母線に取り付ける場合について検討した。すなわち、式（１）に、Ｃ＝０．３５（三相器）、Ｉ＝４０ｋＡ（短時間耐電流値）、ｔ＝０．５ｓ（ＪＥＣ規格に記載されている保護継電器による事故除去時間）、Ｖ＝２５０Ｌとすると、圧力変化ΔＰ＝２．７ＭＰａ－ｇとなり、内部事故前の圧力容器１の圧力が０．４ＭＰａ－ｇであるから、主保護継電器の事故除去時間での圧力容器１内の圧力Ｐは、Ｐ＝３．３ＭＰａ－ｇとなる。 Specifically, a case was examined in which the pressure release device 10 was attached to a three-phase bus with a rated voltage of 168 kV and a rated gas pressure of 0.6 MPa. That is, in the formula (1), C = 0.35 (three-phase device), I = 40 kA (short-time withstand current value), t = 0.5 s (accident elimination time by the protective relay described in the JEC standard). , V = 250L, the pressure change ΔP = 2.7 MPa-g, and the pressure of the pressure vessel 1 before the internal accident is 0.4 MPa-g. Therefore, the pressure vessel 1 inside the pressure vessel 1 at the accident elimination time of the main protective relay. The pressure P of is P = 3.3 MPa-g.
　ＩＥＣ規格品のアルミ鋳物製の圧力容器１は比較的強度が弱いものであり、その強度は例えば４．５ＭＰａである。放圧板１２の作動範囲が主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満であり、例えば、ステンレス製の放圧板１２を用いた場合、この放圧板１２の作動範囲が、４ＭＰａ－ｇ±１０％であるので、主保護継電器の事故除去時間での圧力容器１内の圧力Ｐ＝３．３ＭＰａ－ｇは、この放圧板１２の作動範囲の下限値３．６ＭＰａ－ｇを下回っており、無用な分解ガスの放出を防止することができる。 The pressure vessel 1 made of cast aluminum, which is an IEC standard product, has a relatively weak strength, and the strength is, for example, 4.5 MPa. The operating range of the pressure release plate 12 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and less than the breaking limit pressure of the pressure vessel 1, for example, a stainless steel release plate 12 is used. In this case, since the operating range of the pressure release plate 12 is 4 MPa-g ± 10%, the pressure P = 3.3 MPa-g in the pressure vessel 1 at the accident elimination time of the main protective relay is the pressure release plate 12. It is below the lower limit of 3.6 MPa-g in the operating range, and it is possible to prevent the release of unnecessary decomposition gas.
　（効果）
　本実施形態の放圧装置１０は、密閉された鋳物製の圧力容器１を有するガス絶縁開閉装置用の放圧装置であって、圧力容器１の内部で事故が発生した場合に、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で圧力容器１を開放するようにした。具体的には、放圧装置１０は、圧力容器１に設けられた分岐部１１と、分岐部１２に設けられた放圧板１２と、を備えるようにした。 (effect)
The pressure release device 10 of the present embodiment is a pressure release device for a gas-insulated switching device having a pressure vessel 1 made of a closed casting, and when an accident occurs inside the pressure vessel 1, the pressure vessel 1 The internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay, and the pressure vessel 1 is opened below the breaking limit pressure of the pressure vessel 1. Specifically, the pressure release device 10 is provided with a branch portion 11 provided in the pressure vessel 1 and a pressure release plate 12 provided in the branch portion 12.
　これにより、安価なＩＥＣ規格の圧力容器１を用いても、事故の被害を限定的にしつつも、ガス絶縁開閉装置の製造コストを低減することができる。すなわち、主保護継電器の事故除去時間までは、放圧装置１０が作動しないので、大気中への分解ガスの無用な放出を防止することができ、事故の被害を限定的にすることができる。一方、主保護継電器の事故除去時間より後も主保護継電器等の不動作により圧力上昇が続く場合でも、圧力容器１の内部圧力が破壊限界圧力までには、放圧装置１０が作動するので、安価なＩＥＣ規格の圧力容器１を用いても、圧力容器１が破壊、飛散するのを防止することができ、ガス絶縁開閉装置の製造コストを低減することができる。 As a result, even if an inexpensive IEC standard pressure vessel 1 is used, the manufacturing cost of the gas-insulated switchgear can be reduced while limiting the damage caused by the accident. That is, since the pressure release device 10 does not operate until the accident removal time of the main protective relay, it is possible to prevent unnecessary release of the decomposed gas into the atmosphere and limit the damage caused by the accident. On the other hand, even if the pressure continues to rise due to the non-operation of the main protective relay or the like even after the accident elimination time of the main protective relay, the pressure release device 10 operates until the internal pressure of the pressure vessel 1 reaches the breaking limit pressure. Even if an inexpensive IEC standard pressure vessel 1 is used, it is possible to prevent the pressure vessel 1 from being destroyed and scattered, and it is possible to reduce the manufacturing cost of the gas-insulated switching device.
　（第２実施形態）
　（構成）
　第２実施形態に係る放圧装置について、図面を参照して詳細に説明する。第１実施形態と同一構成及び同一機能については同一符号を付して詳細な説明を省略する。 (Second Embodiment)
(Constitution)
The pressure release device according to the second embodiment will be described in detail with reference to the drawings. The same configurations and the same functions as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
　本実施形態の放圧板１２は、ステンレスの１／１００～１／１０の破壊じん性を有する脆性材料で構成されている。このような脆性材料としては、エポキシ樹脂、セラミックス、又はガラスを用いることができる。なお、ステンレスの破壊じん性は、例えば、３０～３００ＭＰａｍ１／２である。したがって、本実施形態の放圧板１２の脆性材料の破壊じん性は、０．３～３０ＭＰａｍ１／２である。 The pressure release plate 12 of the present embodiment is made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel. As such a brittle material, epoxy resin, ceramics, or glass can be used. The fracture toughness of stainless steel is, for example, 30 to 300 MPam 1/2 . Therefore, the fracture toughness of the brittle material of the pressure release plate 12 of the present embodiment is 0.3 to 30 MPam 1/2 .
　（作用・効果）
　図３は、第２実施形態に係る放圧装置の作動領域を事故時の圧力容器内の圧力の時間特性グラフに示した図である。本実施形態の放圧装置１０は、圧力容器１に設けられた放圧板１２を、ステンレスの１／１００～１／１０の破壊じん性を有する脆性材料で構成するようにした。これにより、図３に示すように、後備保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で放圧装置１０を作動、すなわち放圧板１２を破壊させて圧力容器１の内部空間を開放することができる。 (Action / effect)
FIG. 3 is a diagram showing the operating region of the pressure release device according to the second embodiment in a time characteristic graph of the pressure in the pressure vessel at the time of an accident. In the pressure release device 10 of the present embodiment, the pressure release plate 12 provided in the pressure vessel 1 is made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel. As a result, as shown in FIG. 3, the pressure release device 10 is operated within a range higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the retrofit protection relay and less than the fracture limit pressure of the pressure vessel 1, that is, The pressure release plate 12 can be destroyed to open the internal space of the pressure vessel 1.
　すなわち、放圧板１２は、圧力容器１の内部圧力が高まって破壊される際、内部の圧力を受けて外側に例えばドーム状に膨出し、膨出に耐えきれなくなって破れる。放圧板１２がステンレス製である場合、この膨出の際に、ステンレス自体の粘性が比較的大きいため、放圧板１２が膨出してから破れるまで時間を要する。これに対し、放圧板１２が上記の脆性材料で構成される場合、破壊じん性が小さいことにより当該脆性材料の粘性がステンレスよりも小さく、放圧板１２が膨出してから破れるまでの時間が短い。そのため、放圧装置１０の作動範囲を狭めることができる。 That is, when the internal pressure of the pressure vessel 1 increases and the pressure release plate 12 is destroyed, the pressure vessel 12 bulges outward in a dome shape in response to the internal pressure, and cannot withstand the swelling and is torn. When the pressure release plate 12 is made of stainless steel, it takes time from the expansion of the pressure release plate 12 to the tearing because the viscosity of the stainless steel itself is relatively high at the time of this swelling. On the other hand, when the pressure release plate 12 is made of the above-mentioned brittle material, the viscosity of the brittle material is smaller than that of stainless steel due to its small fracture toughness, and the time from swelling of the pressure release plate 12 to tearing is short. .. Therefore, the operating range of the pressure release device 10 can be narrowed.
　例えば、ステンレス製の放圧板１２を用いた放圧装置１０の作動範囲が、中央値（例えば４．５ＭＰａｍ１／２）の±１０％の幅の範囲であるのに対し、脆性材料で構成した放圧板１２を用いた放圧装置１０の作動範囲は、中央値の±１％の幅の範囲とすることができ、中央値からの幅の範囲を狭めることができる。さらに、脆性材料の中でも、ステンレスの１／１００～１／１０の破壊じん性を有する脆性材料で構成した放圧板１２を用いた放圧装置１０によれば、後備保護継電器の事故除去時間（例えばＪＥＣ規格では、２．０ｓ）での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で作動させることができる。 For example, the operating range of the pressure release device 10 using the stainless steel pressure release plate 12 is within a width of ± 10% of the median value (for example, 4.5 MPam 1/2 ), whereas it is made of a brittle material. The operating range of the pressure release device 10 using the pressure release plate 12 can be a range of ± 1% of the median value, and the range of the width from the median value can be narrowed. Further, according to the pressure release device 10 using the pressure release plate 12 made of a brittle material having a fracture toughness of 1/100 to 1/10 of that of the brittle material, the accident removal time of the retrofit protection relay (for example) According to the JEC standard, the pressure vessel 1 can be operated in a range higher than the internal pressure of the pressure vessel 1 at 2.0 s) and less than the breaking limit pressure of the pressure vessel 1.
　これにより、ＪＥＣ－２３５０：２０１６「主保護継電器による故障除去時間までのガス圧力上昇に耐えなければならない。（内部故障による圧力上昇に耐えるという意味は、放圧装置などの圧力上昇抑制効果がない場合、故障中及び故障除去後、外部へのガス漏れがないことをいう。）」という条件を満たすだけでなく、後備保護継電器による事故除去時間以内の圧力容器１の変形及び内部ガスの大気放出を防止したいユーザの要望を満足することができる。換言すれば、本実施形態の放圧装置１０は、後備保護継電器の事故除去時間までは作動しないので、その時間までは事故により発生した圧力容器１内の分解ガスを大気中に放出することを防止でき、事故の被害を限定的にすることができる。 As a result, JEC-2350: 2016 "must withstand the increase in gas pressure until the failure elimination time by the main protective relay. (The meaning of withstanding the pressure increase due to an internal failure does not have the effect of suppressing the pressure increase of the pressure release device or the like. In this case, it means that there is no gas leak to the outside during the failure and after the failure is removed.) ”, But also the deformation of the pressure vessel 1 and the release of the internal gas to the atmosphere within the accident removal time by the protective relay. It is possible to satisfy the request of the user who wants to prevent. In other words, the pressure release device 10 of the present embodiment does not operate until the accident removal time of the protective relay, so that the decomposition gas in the pressure vessel 1 generated by the accident is released to the atmosphere until that time. It can be prevented and the damage caused by the accident can be limited.
　（第３実施形態）
　（構成）
　第３実施形態に係る放圧装置について、図面を参照して詳細に説明する。第１実施形態と同一構成及び同一機能については同一符号を付して詳細な説明を省略する。 (Third Embodiment)
(Constitution)
The pressure release device according to the third embodiment will be described in detail with reference to the drawings. The same configurations and the same functions as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
　図４は、第３実施形態に係る放圧装置をガス絶縁開閉装置に適用した図である。図４に示すように、絶縁スペーサ３は、その一部が他の部分より薄い。この薄い部分が本実施形態の放圧装置１０である。この薄い部分は、一又は複数の凹みとして設けても良いし、環状に設けても良い。絶縁スペーサ３は、例えばエポキシ樹脂で構成されており、当該薄い部分は、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で破壊される。当該薄い部分は、ステンレスの１／１００～１／１０の破壊じん性を有するエポキシ樹脂などの脆性材料で構成しても良い。 FIG. 4 is a diagram in which the pressure release device according to the third embodiment is applied to a gas-insulated switchgear. As shown in FIG. 4, a part of the insulating spacer 3 is thinner than the other parts. This thin portion is the pressure release device 10 of the present embodiment. This thin portion may be provided as one or more recesses, or may be provided in an annular shape. The insulating spacer 3 is made of, for example, an epoxy resin, and the thin portion is higher than the internal pressure of the pressure vessel 1 at the accident removal time of the main protective relay and is destroyed below the breaking limit pressure of the pressure vessel 1. Will be done. The thin portion may be made of a brittle material such as an epoxy resin having a fracture toughness of 1/100 to 1/10 of stainless steel.
　なお、本実施形態では、絶縁スペーサ３の薄い部分を放圧装置１０として設けるので、第１実施形態の放圧板１２等を有する放圧装置１０は必ずしも設けなくても良い。 In this embodiment, since the thin portion of the insulating spacer 3 is provided as the pressure release device 10, the pressure release device 10 having the pressure release plate 12 or the like of the first embodiment does not necessarily have to be provided.
　（作用・効果）
　本実施形態の放圧装置１０は、圧力容器１内を区分する絶縁スペーサ３の一部が、他の部分より薄く、圧力容器１の内部で事故が発生した場合に、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で圧力容器１の内部空間を開放するようにした。これにより、第１実施形態と同様に、主保護継電器の事故除去時間までは、放圧装置１０が作動しないので、事故の被害を限定的にすることができる。一方、主保護継電器の事故除去時間より後も主保護継電器等の不動作により圧力上昇が続く場合でも、圧力容器１の内部圧力が破壊限界圧力までには、放圧装置１０が作動するので、安価なＩＥＣ規格の圧力容器１を用いても、圧力容器１が破壊、飛散するのを防止することができ、ガス絶縁開閉装置の製造コストを低減することができる。 (Action / effect)
In the pressure release device 10 of the present embodiment, when a part of the insulating spacer 3 that divides the inside of the pressure vessel 1 is thinner than the other parts and an accident occurs inside the pressure vessel 1, the internal pressure of the pressure vessel 1 However, the internal space of the pressure vessel 1 is opened at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and below the breaking limit pressure of the pressure vessel 1. As a result, as in the first embodiment, the pressure release device 10 does not operate until the accident removal time of the main protective relay, so that the damage caused by the accident can be limited. On the other hand, even if the pressure continues to rise due to the non-operation of the main protective relay or the like even after the accident elimination time of the main protective relay, the pressure release device 10 operates until the internal pressure of the pressure vessel 1 reaches the breaking limit pressure. Even if an inexpensive IEC standard pressure vessel 1 is used, it is possible to prevent the pressure vessel 1 from being destroyed and scattered, and it is possible to reduce the manufacturing cost of the gas-insulated switching device.
　また、絶縁スペーサ３がエポキシ樹脂で構成することにより、絶縁スペーサ３の一部である薄い部分が後備保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊されるため、圧力容器１内の隣接する区間にガスを逃がすことができるので、大気中のガスを放出することなく、圧力が高まった区間である圧力容器１の内部空間を開放することができる。その結果、ガス絶縁開閉装置の点検者の安全を確保することができるとともに、環境に悪い絶縁ガスや分解ガスの大気への放出を防止することができる。なお、後備保護継電器の事故除去時間とは、後備保護継電器が事故を検知してから当該後備保護継電器により指令を受けた遮断器が遮断するまでの予め定められた一定時間である。保護継電器の事故除去時間は、例えば、ＪＥＣ規格では、２．０ｓである。 Further, since the insulating spacer 3 is made of an epoxy resin, the thin portion that is a part of the insulating spacer 3 is higher than the internal pressure of the pressure vessel 1 at the accident removal time of the retrofit protection relay, and the pressure vessel 1 has a thin portion. Since the gas is destroyed within the range below the breaking limit pressure, the gas can escape to the adjacent section in the pressure vessel 1, so that the pressure vessel 1 is the section where the pressure is increased without releasing the gas in the atmosphere. The internal space can be opened. As a result, the safety of the inspector of the gas-insulated switchgear can be ensured, and the release of environmentally harmful insulating gas and decomposed gas to the atmosphere can be prevented. The accident elimination time of the back-up protection relay is a predetermined fixed time from the time when the back-up protection relay detects an accident to the time when the circuit breaker commanded by the back-up protection relay shuts off. The accident elimination time of the protective relay is, for example, 2.0 s according to the JEC standard.
　（第４実施形態）
　（構成）
　第４実施形態に係る放圧装置について、図面を参照して詳細に説明する。第１実施形態と同一構成及び同一機能については同一符号を付して詳細な説明を省略する。 (Fourth Embodiment)
(Constitution)
The pressure release device according to the fourth embodiment will be described in detail with reference to the drawings. The same configurations and the same functions as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
　図５は、第４実施形態に係る放圧装置をガス絶縁開閉装置に適用した図である。図５に示すように、絶縁スペーサ３に埋め込まれた内部導体３１の一部が、他の部分より薄い。この薄い部分が本実施形態の放圧装置１０である。この薄い部分は、凹みとして設けることができる。当該薄い部分は、圧力容器１の絶縁スペーサ３で区分された隣接した空間に露出しており、内部導体３１は、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で破壊される導電性材料により構成されている。内部導体３１は、例えば金属による構成することができる。 FIG. 5 is a diagram in which the pressure release device according to the fourth embodiment is applied to a gas-insulated switchgear. As shown in FIG. 5, a part of the inner conductor 31 embedded in the insulating spacer 3 is thinner than the other part. This thin portion is the pressure release device 10 of the present embodiment. This thin portion can be provided as a recess. The thin portion is exposed in the adjacent space divided by the insulating spacer 3 of the pressure vessel 1, and the internal conductor 31 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and , It is composed of a conductive material that breaks below the breaking limit pressure of the pressure vessel 1. The inner conductor 31 can be made of, for example, metal.
　なお、本実施形態では、内部導体３１の薄い部分を放圧装置１０として設けるので、第１実施形態の放圧板１２等を有する放圧装置１０は必ずしも設けなくても良い。 In the present embodiment, since the thin portion of the internal conductor 31 is provided as the pressure release device 10, the pressure release device 10 having the pressure release plate 12 or the like of the first embodiment does not necessarily have to be provided.
　（作用・効果）
　本実施形態の放圧装置１０は、絶縁スペーサ３に埋め込まれた内部導体３１の一部が、他の部分より薄く、圧力容器１の内部で事故が発生した場合に、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満で圧力容器１の内部空間を開放するようにした。これにより、第１実施形態と同様に、主保護継電器の事故除去時間までは、放圧装置１０が作動しないので、事故の被害を限定的にすることができる。一方、主保護継電器の事故除去時間より後も主保護継電器等の不動作により圧力上昇が続く場合でも、圧力容器１の内部圧力が破壊限界圧力までには、放圧装置１０が作動するので、安価なＩＥＣ規格の圧力容器１を用いても、圧力容器１が破壊、飛散するのを防止することができ、ガス絶縁開閉装置の製造コストを低減することができる。 (Action / effect)
In the pressure release device 10 of the present embodiment, when a part of the internal conductor 31 embedded in the insulating spacer 3 is thinner than the other parts and an accident occurs inside the pressure vessel 1, the internal pressure of the pressure vessel 1 However, the internal space of the pressure vessel 1 is opened at a pressure higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and below the breaking limit pressure of the pressure vessel 1. As a result, as in the first embodiment, the pressure release device 10 does not operate until the accident removal time of the main protective relay, so that the damage caused by the accident can be limited. On the other hand, even if the pressure continues to rise due to the non-operation of the main protective relay or the like even after the accident elimination time of the main protective relay, the pressure release device 10 operates until the internal pressure of the pressure vessel 1 reaches the breaking limit pressure. Even if an inexpensive IEC standard pressure vessel 1 is used, it is possible to prevent the pressure vessel 1 from being destroyed and scattered, and it is possible to reduce the manufacturing cost of the gas-insulated switching device.
　また、内部導体３１の薄い部分が主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊されるため、圧力容器１内の隣接する区間にガスを逃がすことができるので、大気中のガスを放出することなく、圧力が高まった区間である圧力容器１の内部空間を開放することができる。その結果、ガス絶縁開閉装置の点検者の安全を確保することができるとともに、環境に悪い絶縁ガスや分解ガスの大気への放出を防止することができる。 Further, since the thin portion of the internal conductor 31 is destroyed in a range higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and less than the destruction limit pressure of the pressure vessel 1, the inside of the pressure vessel 1 is destroyed. Since the gas can be released to the adjacent section of the pressure vessel 1, the internal space of the pressure vessel 1 which is the section where the pressure is increased can be opened without releasing the gas in the atmosphere. As a result, the safety of the inspector of the gas-insulated switchgear can be ensured, and the release of environmentally harmful insulating gas and decomposed gas to the atmosphere can be prevented.
　（他の実施形態）
　本明細書においては、本発明に係る複数の実施形態を説明したが、これらの実施形態は例として提示したものであって、発明の範囲を限定することを意図していない。以上のような実施形態は、その他の様々な形態で実施されることが可能であり、発明の範囲を逸脱しない範囲で、種々の省略や置き換え、変更を行うことができる。これらの実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。 (Other embodiments)
Although a plurality of embodiments according to the present invention have been described in the present specification, these embodiments are presented as examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.
　放圧装置１０は、ガス絶縁開閉装置が備える付属部品に設けるようにしても良い。この付属部品は、ガス絶縁開閉装置の圧力容器１に取り付けられる用品の中で、ガスの密閉や放圧を主目的としていない用品であり、例えば、接地端子の絶縁部、覗き窓、吸着装置、作業用のマンホール部が挙げられる。 The pressure release device 10 may be provided as an accessory component of the gas-insulated switchgear. Among the products attached to the pressure vessel 1 of the gas-insulated switchgear, this accessory is a product whose main purpose is not to seal or release gas. For example, an insulating part of a ground terminal, a viewing window, an adsorption device, and the like. A manhole part for work can be mentioned.
　図６は、他の実施形態に係る放圧装置をガス絶縁開閉装置の接地端子の絶縁部に適用した図である。図６に示すように、圧力容器１には、接地端子５が設けられている。接地端子５は、圧力容器１内の導体２を接地する導電体であり、ガス絶縁開閉装置に設けられた接地開閉器をオンにすると、導体２と導通する。すなわち、接地端子５は、金属製の板であるシャント５２を介して接地開閉器のロッド５３と電気的に接続されており、ロッド５３が摺動してロッド５３の先端部が導体２と電気的に接続されることにより、接地端子５と導体２と導通し、導体２が接地状態となる。この接地端子５は、圧力容器１の壁を貫通して設けられ、接地端子５の胴部に設けられた絶縁部５１により圧力容器１が封止されるとともに、接地端子５が支持される。 FIG. 6 is a diagram in which the pressure release device according to another embodiment is applied to the insulating portion of the ground terminal of the gas-insulated switchgear. As shown in FIG. 6, the pressure vessel 1 is provided with a ground terminal 5. The ground terminal 5 is a conductor that grounds the conductor 2 in the pressure vessel 1, and becomes conductive to the conductor 2 when the ground switch provided in the gas-insulated switch is turned on. That is, the ground terminal 5 is electrically connected to the rod 53 of the ground switch via a shunt 52 which is a metal plate, and the rod 53 slides and the tip of the rod 53 is electrically connected to the conductor 2. By being connected to the ground, the ground terminal 5 and the conductor 2 are electrically connected, and the conductor 2 is in a grounded state. The grounding terminal 5 is provided so as to penetrate the wall of the pressure vessel 1, and the pressure vessel 1 is sealed by an insulating portion 51 provided on the body of the grounding terminal 5, and the grounding terminal 5 is supported.
　すなわち、絶縁部５１は、圧力容器１の内部に設けられた電路となる導体２と接続される接地端子５が埋設され、圧力容器１と接地端子５とを絶縁するとともに、圧力容器１を封止する。絶縁部５１は、例えば、接地端子５とエポキシ樹脂等により一体成型される。接地端子５が円柱状であるとすると、絶縁部５１は、例えば円筒状である。 That is, in the insulating portion 51, a ground terminal 5 connected to a conductor 2 serving as an electric circuit provided inside the pressure vessel 1 is embedded, and the pressure vessel 1 and the ground terminal 5 are insulated and the pressure vessel 1 is sealed. Stop. The insulating portion 51 is integrally molded with, for example, the ground terminal 5 and an epoxy resin or the like. Assuming that the ground terminal 5 is cylindrical, the insulating portion 51 is, for example, cylindrical.
　絶縁部５１は、その一部が他の部分より薄くなっており、この薄い部分を放圧装置１０とすることができる。すなわち、この薄い部分は、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊されることにより、主保護継電器の事故除去時間までは放圧装置１０を作動させずに、事故被害を限定的にしつつ、当該時間より後も主保護継電器等の不動作により圧力上昇が続く場合は、圧力容器１の内部空間を開放し、圧力容器１の破壊を防止することができる。 A part of the insulating part 51 is thinner than the other parts, and this thin part can be used as the pressure release device 10. That is, this thin portion is destroyed in a range where the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1. As a result, if the pressure release device 10 is not operated until the accident removal time of the main protection relay, the accident damage is limited, and the pressure continues to rise due to the non-operation of the main protection relay after that time. The internal space of the pressure vessel 1 can be opened to prevent the pressure vessel 1 from being destroyed.
　図７は、他の実施形態に係る放圧装置をガス絶縁開閉装置の覗き窓に適用した図である。図７に示すように、覗き窓６は、圧力容器１に設けられた圧力容器１の内部を監視するための付属部品である。覗き窓６は、透明な材料で構成されており、ここではガラスにより構成されている。覗き窓６は、例えば５０ｍｍ未満の厚みを有する。 FIG. 7 is a diagram in which the pressure release device according to another embodiment is applied to the viewing window of the gas-insulated switchgear. As shown in FIG. 7, the viewing window 6 is an accessory component for monitoring the inside of the pressure vessel 1 provided in the pressure vessel 1. The viewing window 6 is made of a transparent material, and here it is made of glass. The viewing window 6 has a thickness of, for example, less than 50 mm.
　覗き窓６は、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊されることにより、主保護継電器の事故除去時間までは放圧装置１０を作動させずに、事故被害を限定的にしつつ、当該時間より後も主保護継電器等の不動作により圧力上昇が続く場合は、圧力容器１の内部空間を開放し、圧力容器１の破壊を防止する。なお、覗き窓６には、金属等により構成した開閉式の蓋を設けるようにしても良い。これにより、圧力容器１の内部を監視する際以外は蓋が閉じた状態となるので、仮に事故発生によりガラスの覗き窓６が破壊されたとしてもその破片が飛び散るのを防止することができる。 The viewing window 6 is destroyed because the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1. , If the pressure release device 10 is not operated until the accident removal time of the main protection relay, the accident damage is limited, and the pressure continues to rise due to the non-operation of the main protection relay after that time, the pressure vessel The internal space of 1 is opened to prevent the pressure vessel 1 from being destroyed. The viewing window 6 may be provided with an openable / closable lid made of metal or the like. As a result, the lid is closed except when monitoring the inside of the pressure vessel 1, so even if the glass viewing window 6 is destroyed due to an accident, it is possible to prevent the fragments from scattering.
　覗き窓６は、第２実施形態と同様に、ステンレスの１／１００～１／１０の破壊じん性を有する脆性材料で構成するようにしても良い。 The viewing window 6 may be made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel, as in the second embodiment.
　図８は、他の実施形態に係る放圧装置をガス絶縁開閉装置の吸着装置に適用した図である。図８に示すように、吸着装置７は、圧力容器１に設けられ、事故の際に発生する分解ガス又は水分を吸着する。具体的には、吸着装置７は、分解ガス又は水分を吸着する吸着剤を収容したボックス７０と、圧力容器１に設けられ、ボックス７０を圧力容器１に固定する固定板７１とを有する。ボックス７０には、分解ガス又は水分が入り込むように、複数の孔が設けられている。吸着剤としては、公知のものを用いることができる。 FIG. 8 is a diagram in which the pressure release device according to another embodiment is applied to the adsorption device of the gas-insulated switchgear. As shown in FIG. 8, the adsorption device 7 is provided in the pressure vessel 1 and adsorbs the decomposition gas or water generated in the event of an accident. Specifically, the adsorption device 7 has a box 70 containing an adsorbent for adsorbing decomposition gas or water, and a fixing plate 71 provided in the pressure vessel 1 for fixing the box 70 to the pressure vessel 1. The box 70 is provided with a plurality of holes so that decomposition gas or water can enter. As the adsorbent, a known one can be used.
　固定板７１は、例えばステンレスなどの金属により構成され、圧力容器１の孔を気密に塞いでいる。この固定板７１は、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊される。すなわち、固定板７１は放圧板１２と兼用することができる。これにより、圧力容器１で内部事故が発生しても、固定板７１は、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊されるので、主保護継電器の事故除去時間までは放圧装置１０を作動させずに、事故被害を限定的にしつつ、当該時間より後も主保護継電器等の不動作により圧力上昇が続く場合は、圧力容器１の内部空間を開放し、圧力容器１の破壊を防止することができる。 The fixing plate 71 is made of a metal such as stainless steel, and airtightly closes the hole of the pressure vessel 1. The fixing plate 71 is destroyed in a range where the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1. That is, the fixing plate 71 can also be used as the pressure release plate 12. As a result, even if an internal accident occurs in the pressure vessel 1, the internal pressure of the pressure vessel 1 of the fixing plate 71 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protection relay, and the pressure is high. Since the vessel 1 is destroyed within the range below the breaking limit pressure, the pressure release device 10 is not operated until the accident removal time of the main protection relay, and the accident damage is limited after that time. When the pressure continues to rise due to a malfunction such as, the internal space of the pressure vessel 1 can be opened to prevent the pressure vessel 1 from being destroyed.
　図９は、他の実施形態に係る放圧装置をガス絶縁開閉装置の作業用のマンホール部に適用した図である。図９に示すように、マンホール部８は、着脱母線となる導体２などの部材を圧力容器１内に設けるための搬入搬出口であり、圧力容器１から分岐して構成された筒状の分岐部８１と、分岐部８１の開口を気密に塞ぐ蓋８２とを備える。蓋８２は、放圧板１２として兼用することができる。すなわち、蓋８２は、圧力容器１の内部圧力が、主保護継電器の事故除去時間での圧力容器１の内部圧力よりも高く、かつ、圧力容器１の破壊限界圧力未満の範囲で破壊される。これにより、主保護継電器の事故除去時間までは放圧装置１０を作動させずに、事故被害を限定的にしつつ、当該時間より後も主保護継電器等の不動作により圧力上昇が続く場合は、圧力容器１の内部空間を開放し、圧力容器１の破壊を防止することができる。 FIG. 9 is a diagram in which the pressure release device according to another embodiment is applied to the working manhole portion of the gas-insulated switchgear. As shown in FIG. 9, the manhole portion 8 is a carry-in / carry-out outlet for providing a member such as a conductor 2 serving as a detachable bus in the pressure vessel 1, and is a tubular branch formed by branching from the pressure vessel 1. A portion 81 and a lid 82 that airtightly closes the opening of the branch portion 81 are provided. The lid 82 can also be used as the pressure release plate 12. That is, the lid 82 is destroyed in a range where the internal pressure of the pressure vessel 1 is higher than the internal pressure of the pressure vessel 1 at the accident elimination time of the main protective relay and is less than the breaking limit pressure of the pressure vessel 1. As a result, if the pressure release device 10 is not operated until the accident removal time of the main protective relay, the accident damage is limited, and the pressure continues to rise due to the non-operation of the main protective relay or the like after that time. The internal space of the pressure vessel 1 can be opened to prevent the pressure vessel 1 from being destroyed.
　以上のように、ガス絶縁開閉装置の付属部品に放圧装置１０を設けることで、放圧装置１０を設けるための圧力容器１の分岐（すなわち分岐部１１）を削減でき、材料加工費の低減を図ることができる。また、付属部品の一部を放圧板１２とすることで、別途取付板１３などが不要であり、部品点数の削減、部品コストの低減、及び作業時間の短縮化を図ることができる。 As described above, by providing the pressure release device 10 as an accessory part of the gas-insulated switchgear, the branching (that is, the branching portion 11) of the pressure vessel 1 for providing the pressure releasing device 10 can be reduced, and the material processing cost can be reduced. Can be planned. Further, by using the pressure release plate 12 as a part of the accessory parts, a separate mounting plate 13 or the like is not required, and the number of parts can be reduced, the parts cost can be reduced, and the working time can be shortened.
１　　　　　　　圧力容器
２　　　　　　　導体
３　　　　　　　絶縁スペーサ
３１　　　　　　内部導体
４　　　　　　　接続導体
５　　　　　　　接地端子
５１　　　　　　絶縁部
５２　　　　　　シャント
５３　　　　　　ロッド
６　　　　　　　覗き窓
７　　　　　　　吸着装置
７０　　　　　　ボックス
７１　　　　　　固定板
８　　　　　　　マンホール部
８１　　　　　　分岐部
８２　　　　　　蓋
１０　　　　　　放圧装置
１１　　　　　　分岐部
１１ａ　　　　　Ｏリング
１２　　　　　　放圧板
１３　　　　　　取付板 1 Pressure vessel 2 Conductor 3 Insulation spacer 31 Internal conductor 4 Connection conductor 5 Ground terminal 51 Insulation part 52 Shunt 53 Rod 6 Peeping window 7 Suction device 70 Box 71 Fixing plate 8 Manhole part 81 Branch part 82 Lid 10 Pressure release device 11 Branch part 11a O-ring 12 Pressure release plate 13 Mounting plate

Claims (12)

  1. 　密閉された鋳物製の圧力容器を有するガス絶縁開閉装置用の放圧装置であって、
    　前記圧力容器の内部で事故が発生した場合に、
    　前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　放圧装置。     A pressure release device for a gas-insulated switchgear having a sealed cast pressure vessel.
    In the event of an accident inside the pressure vessel
    The internal pressure of the pressure vessel is higher than the internal pressure of the pressure vessel at the accident elimination time of the main protective relay, and the internal space of the pressure vessel is opened below the breaking limit pressure of the pressure vessel.
    Pressure release device.
  2. 　前記圧力容器に設けられた分岐部と、
    　前記分岐部に設けられた放圧板と、
    　を備えた、
    　請求項１記載の放圧装置。     The branch portion provided in the pressure vessel and
    A pressure release plate provided at the branch portion and
    With,
    The pressure release device according to claim 1.
  3. 　前記圧力容器に設けられた放圧板を有し、
    　前記放圧板は、ステンレスの１／１００～１／１０の破壊じん性を有する脆性材料で構成されている、
    　請求項１記載の放圧装置。     It has a pressure release plate provided in the pressure vessel and has
    The pressure release plate is made of a brittle material having a fracture toughness of 1/100 to 1/10 of stainless steel.
    The pressure release device according to claim 1.
  4. 　前記脆性材料は、エポキシ樹脂、セラミックス、又はガラスである、
    　請求項３記載の放圧装置。     The brittle material is epoxy resin, ceramics, or glass.
    The pressure release device according to claim 3.
  5. 　前記圧力容器内には、前記圧力容器内を区分する絶縁スペーサが設けられ、
    　前記絶縁スペーサの一部が、他の部分より薄く、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　請求項１記載の放圧装置。     An insulating spacer that separates the inside of the pressure vessel is provided in the pressure vessel.
    When a part of the insulating spacer is thinner than the other part and an accident occurs inside the pressure vessel, the internal pressure of the pressure vessel is the internal pressure of the pressure vessel at the accident elimination time of the main protection relay. Opening the internal space of the pressure vessel above and below the breaking limit pressure of the pressure vessel.
    The pressure release device according to claim 1.
  6. 　前記圧力容器内には、前記圧力容器内を区分する絶縁スペーサが設けられ、
    　前記絶縁スペーサに埋め込まれた内部導体の一部が、他の部分より薄く、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　請求項１記載の放圧装置。     An insulating spacer that separates the inside of the pressure vessel is provided in the pressure vessel.
    When a part of the internal conductor embedded in the insulating spacer is thinner than the other part and an accident occurs inside the pressure vessel, the internal pressure of the pressure vessel is the accident elimination time of the main protection relay. The internal space of the pressure vessel is opened at a pressure higher than the internal pressure of the pressure vessel and below the breaking limit pressure of the pressure vessel.
    The pressure release device according to claim 1.
  7. 　前記ガス絶縁開閉装置が備える付属部品に設けられた、
    　請求項１記載の放圧装置。     Provided to the accessory component of the gas-insulated switchgear,
    The pressure release device according to claim 1.
  8. 　前記付属部品は、
    　前記圧力容器の内部に設けられた電路となる導体と接続される接地端子が埋設され、前記圧力容器と前記接地端子とを絶縁するとともに、前記圧力容器を封止する絶縁部であり、
    　前記絶縁部の一部が、他の部分より薄く、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　請求項７記載の放圧装置。     The accessory parts
    A grounding terminal connected to a conductor serving as an electric circuit provided inside the pressure vessel is embedded, and is an insulating portion that insulates the pressure vessel and the grounding terminal and seals the pressure vessel.
    When a part of the insulating portion is thinner than the other part and an accident occurs inside the pressure vessel, the internal pressure of the pressure vessel is the internal pressure of the pressure vessel at the accident elimination time of the main protection relay. Opening the internal space of the pressure vessel above and below the breaking limit pressure of the pressure vessel.
    The pressure release device according to claim 7.
  9. 　前記付属部品は、前記圧力容器の内部を監視する覗き窓であり、
    　前記覗き窓は、ガラスで構成され、５０ｍｍ未満の厚みであり、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　請求項７記載の放圧装置。     The accessory is a viewing window that monitors the inside of the pressure vessel.
    The viewing window is made of glass and has a thickness of less than 50 mm, and when an accident occurs inside the pressure vessel, the internal pressure of the pressure vessel is the pressure vessel at the accident elimination time of the main protection relay. The internal space of the pressure vessel is opened at a pressure higher than the internal pressure of the pressure vessel and below the breaking limit pressure of the pressure vessel.
    The pressure release device according to claim 7.
  10. 　前記付属部品は、
    　前記圧力容器に設けられ、前記事故の際に発生する分解ガス又は水分を吸着する吸着装置であり、
    　前記吸着装置は、前記分解ガス又は水分を吸着する吸着剤を収容したボックスと、前記圧力容器に設けられ、前記ボックスを前記圧力容器の内部で固定する固定板とを有し、
    　前記固定板は、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　請求項７記載の放圧装置。     The accessory parts
    It is an adsorption device provided in the pressure vessel and adsorbs decomposition gas or water generated in the event of the accident.
    The adsorption device has a box containing an adsorbent that adsorbs the decomposition gas or water, and a fixing plate provided in the pressure vessel and fixing the box inside the pressure vessel.
    In the fixing plate, when an accident occurs inside the pressure vessel, the internal pressure of the pressure vessel is higher than the internal pressure of the pressure vessel at the accident elimination time of the main protection relay, and the pressure vessel The internal space of the pressure vessel is opened below the breaking limit pressure of
    The pressure release device according to claim 7.
  11. 　前記付属部品は、前記圧力容器に設けられた作業用のマンホール部であり、
    　前記マンホール部の蓋は、前記圧力容器の内部で事故が発生した場合に、前記圧力容器の内部圧力が、主保護継電器の事故除去時間での前記圧力容器の内部圧力よりも高く、かつ、前記圧力容器の破壊限界圧力未満で前記圧力容器の内部空間を開放する、
    　請求項７記載の放圧装置。     The accessory part is a work manhole portion provided in the pressure vessel.
    In the case where an accident occurs inside the pressure vessel, the lid of the manhole portion has an internal pressure of the pressure vessel higher than the internal pressure of the pressure vessel at the accident elimination time of the main protection relay and said. The internal space of the pressure vessel is opened below the breaking limit pressure of the pressure vessel.
    The pressure release device according to claim 7.
  12. 　請求項１～請求項１１の何れか記載の放圧装置が設けられた、
    　ガス絶縁開閉装置。     The pressure release device according to any one of claims 1 to 11 is provided.
    Gas insulation switchgear.
PCT/JP2019/015597 2019-04-10 2019-04-10 Pressure release device and gas insulated opening/closing device WO2020208737A1 (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761812U (en) * 1980-09-30 1982-04-13
JPS5935507A (en) * 1982-08-20 1984-02-27 株式会社東芝 Enclosed switchboard
JPS6013714U (en) * 1983-07-06 1985-01-30 三菱電機株式会社 Pressure relief device for oil-filled electrical equipment
JPS62250807A (en) * 1986-04-22 1987-10-31 株式会社東芝 Gas insulated switchgear
JPH0346069U (en) * 1989-09-13 1991-04-26
JPH062644U (en) * 1992-06-19 1994-01-14 株式会社高岳製作所 Gas insulated transformer
JPH09215137A (en) * 1996-01-29 1997-08-15 Nissin Electric Co Ltd Gas insulation switchgear
JPH1023622A (en) * 1996-07-04 1998-01-23 Mitsubishi Electric Corp Gas-insulated bus-bar device
JP2013233059A (en) * 2012-05-01 2013-11-14 Mitsubishi Electric Corp Gas-insulated switchgear
JP2017060214A (en) * 2015-09-14 2017-03-23 株式会社東芝 Pressure vessel

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761812U (en) * 1980-09-30 1982-04-13
JPS5935507A (en) * 1982-08-20 1984-02-27 株式会社東芝 Enclosed switchboard
JPS6013714U (en) * 1983-07-06 1985-01-30 三菱電機株式会社 Pressure relief device for oil-filled electrical equipment
JPS62250807A (en) * 1986-04-22 1987-10-31 株式会社東芝 Gas insulated switchgear
JPH0346069U (en) * 1989-09-13 1991-04-26
JPH062644U (en) * 1992-06-19 1994-01-14 株式会社高岳製作所 Gas insulated transformer
JPH09215137A (en) * 1996-01-29 1997-08-15 Nissin Electric Co Ltd Gas insulation switchgear
JPH1023622A (en) * 1996-07-04 1998-01-23 Mitsubishi Electric Corp Gas-insulated bus-bar device
JP2013233059A (en) * 2012-05-01 2013-11-14 Mitsubishi Electric Corp Gas-insulated switchgear
JP2017060214A (en) * 2015-09-14 2017-03-23 株式会社東芝 Pressure vessel

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