US3614355A - Sf{11 {0 system with constant density and constant pressure differential maintaining means for a high-voltage switchgear - Google Patents

Sf{11 {0 system with constant density and constant pressure differential maintaining means for a high-voltage switchgear Download PDF

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US3614355A
US3614355A US815674A US3614355DA US3614355A US 3614355 A US3614355 A US 3614355A US 815674 A US815674 A US 815674A US 3614355D A US3614355D A US 3614355DA US 3614355 A US3614355 A US 3614355A
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pressure
gas
low
compartment
density
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Rintje Boersma
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COQ NV
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COQ NV
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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
    • 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
    • H02B13/035—Gas-insulated switchgear
    • H02B13/055—Features relating to the gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85—Chromium, molybdenum or tungsten
    • B01J23/88—Molybdenum
    • B01J23/885—Molybdenum and copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H01H33/562—Means for avoiding liquefaction or for disposing of liquefaction products

Definitions

  • Metal clad switch gear for high voltages comprising switches and accessories, low-overpressure and highoverpressure compartments filled with SF gas and a gas-controlsystem controlling the flow of gas to and from said compartments and keeping both the pressure difference between said compartments and the density of the SF gas in the lowoverpressure compartment(s) substantially constant.
  • the invention relates to metal clad switch gear for high voltages comprising a metal envelope adapted to be connected to earth and containing at least a gas blast circuit breaker, a lowpressure compartment filled with SF,,gas of lower overpressure for the insulation of the live parts of the switch gear from earth and a high-pressure compartment filled with SF -gas of higher overpressure for the extinction of the switching arc and a composite gas-control system to control the flow of gas to and from said compartments, said gas-control system being arranged to keep the pressure difference between both compartments substantially constant by controlling the density of the sF -gas in each one of the two compartments.
  • switch gear filled with SF -gas changes of the state of the gas economy occur repeatedly as a result of the properties of said gas and the operation of the switch gear.
  • switch gear local temperature variations can occur which are produced by the current flowing through the conductors and the continuously varying temperature of the outer air. These temperature variations can have, during operation, a range of 25 C. to +85 C.
  • the change of pressure of a SF -gas mass of a given volume due to a change of temperature is greater as the density of said mass is higher, which means that the isochores in the pressure-versus-temperature diagram are steeper at higher density than at lower density.
  • the pressure and the temperature of the SF,-gas can have values, at which said gas condenses.
  • the gas-control system must reckon with these properties and also ensure that the density of the SF -gas in no one of the compartments containing live parts falls down below a given value, since otherwise the insulation from earth is endangered, and that the pressure difference between the high-pressure compartment and the low-pressure compartment remains above the minimum value required for a sufiicient extinguishing action and, if necessary, for a satisfactory driving of the switches.
  • Switch gear of the described kind in which the various above mentioned facts are reckoned with, has been disclosed in US. Pat. 3,390,241.
  • said switch gear the gas-control system tries to keep both the total quantity of SF -gas contained in the switch gear and the pressure difference between the high-pressure gas mass and the low-pressure gas mass constant as much as possible. This means, that not only during the switching process, but also at a rise in temperature in the stationary state of the switch gear SF -gas must be transported from the high-pressure compartment towards the low-pressure compartment, so that the pressure in the low-pressure compartment then will increase more than would have been the case, when in the low-pressure compartment only a rise in temperature occurs.
  • the invention has for its object to provide switchgear of the kind referred to which is simpler, has a cheaper construction, can be easily made gastight and for which a relatively simple gas-control system is required. It consists in that the gas-control system is so arranged and so operates as to keep also, under all circumstances, the density of the SF -gas in the lowpressure compartment substantially constant. This measure has the advantage that at a rise in temperature the pressures in the low-pressure compartment and in the high-pressure compartment will increase relatively slightly, so that lighter structures can be used and a satisfactory seal can easily be realized. Moreover, a relatively simple gas-control system can be used, since the control has only to do with two quantities, viz the density in the low-pressure compartment and the said pressure difference.
  • the switchgear can be so constructed that the low-pressure compartment is connected to a discharge conduit and a supply conduit, said conduits cooperating with means acting on the density of the gas in said compartment, said means ensuring that gas flows from and to the low-pressure compartment, when the density of the gas in said compartment becomes higher and lower than the required density,
  • both compartments being connected to a differential-pressure relay which opens said valve or starts said compressor when the pressure difference between both compartments becomes higher or lower than the required pressure difl'erence, respectively.
  • a relay acting on the density of the SF -gas contained in the low-pressure compartment and a differential-pressure relay are necessary.
  • the high-pressure compartment can only receive gas from or supply gas to the low-pressure compartment, so that the gas supply of the switchgear takes place only through the low pressure compartment.
  • switchgear is recommended in which gas discharged from the switchgear is collected in a storage tank.
  • the switchgear and its gas-control system may then be constructed in such a manner that the discharge conduit is connected through a check valve closing towards the low-pressure compartment with a low-pressure storage tank and the supply conduit is connected through a valve to a high-pressure storage tank, whereas the two storage tanks are interconnected by a conduit provided with a second compressor and a relay acting on the density of the gas in the low-pressure compartment is used said relay opening and closing said valve, when the density of the gas in the low-pressure compartment becomes a given value lower than or becomes equal to the required density, respectively.
  • each switching unit of the switchgear has a gas-control system provided with its own gas storage tanks
  • this system may advantageously be made in such a manner, that the relay acting on the density of the gas in the low-pressure compartrneritstafts'and stops'thesecond compressor, when the den si ty fact that the temperature of the gas in the storage tank, said gas having the temperature of the outer air, can differ considerably from that of the gas in the low-pressure compartment, through which the main current heating the gas passes.
  • the gas from the low-pressure compartment could circulate continuously through the two storage tanks.
  • the differential-pressure relay prevents the unnecessary circulation of the gas in the low-pressure system.
  • the switchgear can be made considerably simpler, when the gas control systems of a plurality of switching units cooperate with a common low-pressure storage tank, a common highpressure storage tank and a conduit connected between these storage tanks which is provided with a second compressor. In that case the differential-pressure relay can be omitted.
  • a relay acting on the density of the gas in the lowpressure storage tank is then provided, said latter relay starting and stopping the second compressor at density values which are so much higher than the density values, at which the relay acting on the density of the gas in the low-pressure compartment closes and opens the valve, as to guarantee that at the maximum temperature difference to be expected between the gas in the low-pressure compartment and the gas in the low-pressure storage tank the second compressor is started at a higher gas pressure than that, at which the valve is closed, and is stopped at a higher gas pressure than that, at which the valve is opened. If the density relays in the low-pressure compartments of the switching units are adjusted in this manner in respect of the density relay provided in the common low-pressure storage tank, the gas systems of said switching units cannot influence one another.
  • the gas blast circuit breaker is provided with an expansion tank to collect the used extinguishing gas
  • the extinguishing gas which is deionized in the expansion tank and cleansed by the filter, will then reach the low-pressure compartment not directly but by a roundabout way, so that in the low-pressure compartment a sudden rise of the density will not be produced, since said rise of density is neutralized relatively slowly by the control system.
  • the used highly heated extinguishing gas will get sufficient time to cool down, before it is returned into the switchgear.
  • a buffer tank is inserted in the conduit extending between the expansion tank and the low-pressure storage tank, said bufi'er tank being provided between the check valve and the filter.
  • This buffer tank damps the velocity of the extinguishing gas which escapes from the expansion tank during the switching-off process, so that it flows slowly through the filter and can be well cleansed.
  • the conduit having the check valve and extending between the low-pressure compartment and the expansion tank ensures that in the stationary state of the switchgear the pressure in the expansion tank is about equal to that in the low-pressure compartment.
  • the high-pressure compartment can be connected by a condensate conduit and a vapor conduit to an evaporator adapted to be heated by a heating element and provided with a relay acting on the liquid level in the evaporator, said relay putting the heating element into operation, when said level exceeds a predetermined value.
  • FIG. 1 a temperature-versus-pressure diagram of SF -gas at constant volume. for the range which is interesting to switch gear constructed according to the invention, said F K]. 1 showing lines of constant density (isochores),
  • F l6. 2 a schematic view of the part of the switchgear which is necessary to understand the invention, said switchgear being provided with a gas-control system carried out in accordance with the invention,
  • FIG. 3 a similar schematic view of an other embodiment of the gas-control system of said switchgear
  • FIG. 4 a schematic view of a variant of the gas-control system shown in FIG. 3 and FIG. 5 a pressure-versus-temperature diagram to determine the adjustment of density relays used in the gas-control system shown in FIG. 4.
  • the metal clad switchgear illustrated in FIGS. 2 and 3 comprise a gas blast circuit breaker 3 accommodated in a highpressure compartment 2 filled with SF -gas, said circuit breaker having four places of interruption to interrupt the main current circuit, an isolator switch 4 connected in series with said circuit breaker and adapted to keep the main current circuit interrupted and to close said circuit, two bus bar isolators 5, 6 connected in series with the gas blast circuit breaker 3, two rails 7, 8 forming part of different bus bar systems, a cabel terminal box 9, an earthing switch 10, an overvoltage protective device 11 and current transformers 12, 13 for measuring and protection.
  • the container enclosing the high-pressure compartment 2 and accommodating the gas blast circuit breaker 3 is positioned in a low-pressure compartment 14 also filled with SF gas and surrounded by a metal envelope adapted to be connected to' earth.
  • a low-pressure compartment 14 also filled with SF gas and surrounded by a metal envelope adapted to be connected to' earth.
  • Mounted in said compartment 14 are also the isolator switch 4, the movable contacts of the bus bar isolator switches 5,6, the current transformers l2, l3 and an expansion tank 15, in which the extinguishing gas from the highpressure compartment 2 and used to extinguish the switching arcs during the switching-off process is collected and deionized.
  • the fixed contacts of the bus bar isolators 5, 6 the rails 7, 8, the cabel terminal box 9, the earthing switch 10, the overvoltage protective device 11 and the connecting conductors extending between the isolator switch 4 and the cabel terminal box 9 and between said box and the overvoltage protective device 11 are accommodated in individual low-pressure compartments l6, 17, 18, 19, 20, 21, 22, 23, 24 filled with SF -gas, said latter compartments communicating in a not shown manner with the low-pressure compartment 14, so that therein the same pressure obtains and all these compartments may be considered as one single low-pressure compartment.
  • the SF -gas contained in the low-pressure compartment serves mainly to insulate the live parts from earth.
  • the SF -gas contained in the high-pressure compartment 2 is in the first place used to extinguish the switching arcs but it may also be used for the pneumatical driving of the gas blast circuit breaker and the isolator switches 4, 5, 6.
  • the density of the SF -gas in the low-pressure compartment 14 and, consequently, also in the other low pressure compartments is kept constant as much as possible, e.g. at a value of 40 gram per liter. This value has been indicated in the diagram shown in FIG. 1 by the thick isochore 25.
  • the density in the high-pressure compartment 2 is so controlled, as to keep also the pressure dif ference between the high-pressure compartment 2 and the low-pressure compartment 14 substantially constant, e.g. at a value of kg./cm.
  • the density of the gas contained in the high-pressure compartment must be changed in accordance with the thick line 26 shown in the diagram given in FIG. 1 at a change of temperature.
  • the low-pressure compartment 14 is connected bothto a supply conduit 29 provided with an electromagnetically controlled valve 28 and connected with a gas bottle 30 and to a discharge conduit 32 provided with an electromagnetically controlled valve 31.
  • a conduit 33 provided with an electromagnetically controlled valve 34 and a conduit 35 provided with a compressor 36.
  • the expansion tank is connected to the low-pressure compartment 14 both by means of a conduit 37 provided with two filters 38, which can be cleaned alternately, and by means of a conduit 39 provided with a check valve 40 closing towards the low-pressure compartment 14.
  • the high-pressure compartment 2 is connected by means of a condensate conduit 41 and a vapor conduit 42 with an evaporator 44 adapted to be heated by an electric heating element 43.
  • a relay 45 acting on the density of the SF -gas, contained in the low-pressure cornpartment l4, and having contacts 46, 47 for the electric control of the valves 28, 31 is provided in the low-pressure compartment 14 and a differential-pressure relay 48 having contacts 49, 50 for the electric control of the valve 34 and the compressor 36 is connected to the low-pressure compartment 14 and the high-pressure compartment 2.
  • the gas in the lowpressure compartment 14 has the required density and the gas in the high-pressure compartment 2 has such a density as to guarantee that the pressure difference between the compartments 2 and 14 has the required value.
  • the pressure in the expansion tank 15 is equal to that in the low-pressure compartment 14.
  • the switching-off process upsets the stationary state.
  • gas flows from the high-pressure compartment 2 through the switching contacts of the gas blast circuit breaker 3 to the expansion tank 15 and thereafter from this tank through the conduit 37 and a filter 38 to the low-pressure compartment 14.
  • the differential-pressure relay 48 then closes the contact 50, whereby the compressor 36 is started.
  • the density relay 45 comes into action and closes the contact 47.
  • this contact 47 does not result in opening the valve 31 of the discharge conduit 32, since this contact is connected in series with an auxiliary contact 53 of the differential-pressure relay 48, said auxiliary contact 53 being closed in the state of equilibrium of the relay 48 and in the position thereof, in which the contact 49 is closed, but being opened in the position of the relay 48, in which the contact 50 is closed and the compressor 36 operates. In that case no gas is lost through the discharge conduit 32 notwithstanding the density in the compartment 14 is too high.
  • the SF -gaS can condense. This danger only occurs in the high-pressure compartment 2. As the condensation of the gas and the evaporation of the condensate have a disturbing effect on maintaining the pressure difference between the highand low-pressure compartment the heating element 43 is set into operation as soon as condensate flows into the evaporator 44. Due thereto the SF -gas in the highpressure compartment 2 is heated to get a temperature above the dew point.
  • the gas-control system shown in FIG. 3 is provided with a lowpressure storage tank 54, the discharge conduit 32 being connected to said storage tank 54 through a check valve 55 closing towards the low-pressure compartments 14 of the switchgear.
  • the expansion tank 15 is connected to the lowpressure storage tank 54 through the conduit 37, a check valve 56 closing towards the low-pressure compartment 14, a buffer tank 57 and the filters 38.
  • the low-pressure storage tank 54 is connected to a high-pressure storage tank 60 by a conduit 58 providedwith a second compressor 59, said highpressure storage tank 60 being connected to the supply conduit 29 provided with the electromagnetically operating valve 28.
  • the gas bottle 30 is connected with the high-pressure storage tank 60 by a conduit 61 provided with a valve 62 and it has the task to cover losses of SF -gas by leakage.
  • the differential-pressure relay 48 is connected to the low-pressure compartment 14 through the expansion tank 15 and the conduit 39 provided with the check valve 40. This has the ad vantage that the differential-pressure relay 48 becomes earlier active and also starts the compressor 36, during the switchingoff process, earlier than it does in the system shown in FIG. 2, since, during a switching-off operation, the pressure in the ex pansion tank 15 rises much quicker than the pressure in the low-pressure compartment 14.
  • the relay 45 acting on the density of the gas in the lowpressure compartment 14 controls by its contact 46 the valve 28 provided in the supply conduit 29 and by its contact 47 the second compressor 59. Finally a second differential-pressure relay 63 is provided between the low-pressure compartment 14 and the low-pressure storage tank 54, the contact 64 of said relay controlling the compressor 59.
  • This gas-control system operates as follows:
  • the relay 48 starts the compressor 36. Owing thereto the compartment 2 receives gas from the compartment 14 and the density of the gas in the low-pressure compartment 14 decreases and becomes too low, so that the relay 45 closes its contact 46 resulting in that the valve 28 is opened and gas flows from the high-pressure storage tank 60 to the low-pressure compartment 14 to supply the gas deficiency.
  • the storage tanks 54 and 60 are situated outside the switchgear and no electric current flows through them, so that great temperature differences can be set up between the gas in these tanks and the gas in the switchgear. Said temperature differences could disturb the stationary gas economy in the system. If the switchgear has been dead for a long time the temperature in the switchgear and that in the lowpressure storage tank 54 will be equal, so that the gas densities in the compartment 14 and the tank 54 will also be equal, since the pressures are equal too. However, if current flows through the switchgear the temperature in the low-pressure compartment 14 will become higher than that in the low-pressure storage tank 54.
  • the sensibility of these relays defines, within which range the den sity in the low-pressure compartment 14 and the pressure difference between the compartments 2 and 14 can be kept constant. It will be obvious, that it is not possible to keep these quantities exactly constant.
  • the buffer tank 57 has the object to level the sudden pressure rise in the expansion tank 15 due to the switching-off of the gas blast circuit breaker 3, so that the extinguishing gas which is contaminated by the switching process flows with low speed through the filter 38 to the low-pressure storage tank 54. The effect of the filter is thereby considerably increased.
  • each switching unit is provided with its own set of storage tanks 54, 60 and accessories.
  • each switching unit is more advantageous to use one single lowpressure storage tank and one single high-pressure storage tank for a plurality of switching units.
  • the gas-control system then must be so arranged, that change of the conditions in a given switching unit does not affect the conditions in other switching units of the switchgear.
  • An example of switchgear consisting of a plurality of switching units which are connected in parallel to a set of storage tanks 54, 60 is illustrated in FIG. 4.
  • the gas-control system in H6. 4 differs from that shown in FIG. 3 in that the difi'erential-pressure relay 63 has been' at the higher temperature T, this closing takes place at the higher pressure indicated by point 68.
  • the density relay 45 closes the contact 46, when the pressure in the low-pressure compartment 14 becomes a value equal to one-half kg./cm.
  • the valve 28 is opened, when the gas pressure in the compartment 14 has reached the value indicated by point 69 but at the temperature T the valve 28 will open at the pressure indicated by the point 70.
  • the density relay 65 in the low-pressure storage tank 54 has been adjusted at higher density values.
  • the contact 66 of the relay 65 is closed and the second compressor 59 is started, when the density in said storage tank has reached a value, at which the pressure in said tank has the value indicated by the point 71.
  • the contact 66 is opened and the compressor 59 is stopped again, when the pressure in the storage tank 54 is returned to the pressure indicated by the point 72, said pressure being, in the present case, one-half kg./cm.
  • the relay 65 puts the compressor 59 in operation at a pressure which is higher than the pressure, at which the relay 45 closes the valve 28, and stops the compressor 59 at a pressure, which is higher than the pressure at which the relay 45 opens the valve 28.
  • the gas in the low-pressure compartment 14 of said unit has the right density defined by the isochore 25 (FIG. and the temperature of the gas in the low-pressure compartment 14 is equal to the temperature of the gas in the low-pressure storage tank 54, that means is equal to T the gas densities and the gas pressures in said compartment 14 and said storage tank 54 will be equal too.
  • the gas pressure then is given by the point 67. If thereafter the switching unit is switched in, so that current flows through it, the temperature in the low-pressure compartment 14 could, in the most unfavorable situation, rise l5 C.
  • a switchgear system for high voltage electrical circuits comprising in combination;
  • an electrically conductive envelope housing at least a gas blast circuit breaker and related portions of a high voltage electrical circuit, said envelope being adapted for connection to earth and defining low-pressure and high-pressure compartments of fixed volumes, said low pressure compartment beingfilled with an amount of gaseous sulfur hexafluoride sufficient to establish a relatively low pressure in such compartment which will insulate live parts of the switchgear from earth, and said high-pressure compartment being filled with an amount of gaseous sulfur hexafluoride sufiicient to establish a relatively high pressure in such compartment which is capable of extinguishing a switching are caused by operation of said circuit breaker; means for maintaining a substantially constant density of gas in said low-pressure compartment whereby the lowpressure compartment is subjected to limited gas pressure variation in response to temperature variations; and
  • said means for maintaining a substantially constant density of gas in said low-pressure compartment comprises a discharge conduit (32) and a supply conduit (29), said conduits (32, 29) being connected to the low-pressure compartment (14) and cooperating with flow regulating means (45, 31, 28) acting on the density of the gas in said compartment (14), said flow regulating means ensuring that gas flows from and to the lowpressure compartment 14) when the density of the gas in said compartment (14) becomes higher and lower than the required density, respectively, said means for varying the density of the gas in said high-pressure compartment comprising a conduit (33) provided with a valve (34) and a conduit (35) provided with a compressor (36), said conduits being connected between the low-pressure compartment (14) and the high-pressure compartment (2), and a differentialpressure relay (48, 49, 50) connected to both compartments (2, 14) and either opening said valve (34) or starting said compressor (36), when the pressure difference between both compartments (2, 14) becomes higher or lower than the required pressure
  • Metal clad switchgear as claimed in claim 2, comprising a check valve (55) closing towards the low-pressure compartment (14) and being provided in the discharge conduit (32) 1 l which is connected to a low-pressure storage tank (54), the supply conduit (29) being connected through a valve (28) to a high-pressure storage tank (60), a conduit (58) provided with a second compressor (59) being connected between both storage tanks (54, 60), a relay (45) acting on the density of the gas in the low-pressure compartment (14) and adapted to open and to close said valve (28) when the density of the gas in the low-pressure compartment 14 becomes a given value lower than or becomes equal to the required density, respectively, and means (63, 65) for starting the second compressor (59), when the low-pressure storage tank (54) contains too much gas at the temperature obtaining in said tank (FIG. 3,
  • Metal clad switchgear as claimed in claim 3, comprising a gas blast circuit breaker provided with an expansion tank (15) to collect the used extinguishing gas, said expansion tank (15) communicating with the low-pressure storage tank (54) through a conduit (37) provided with a check valve (56) closing towards said tank and a filter (38), said expansion tank (15) also communicating with the low-pressure compartment (14) through a conduit (39) provided with a check valve (40) closing towards said compartment l4).
  • Metal clad switchgear as claimed in claim 6, comprising a buffer tank (57) provided between the check valve (56) and the filter (38) in the conduit (37) extending between the expansion-tank (l5) and the low-pressure storage tank (54).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US815674A 1968-04-22 1969-04-14 Sf{11 {0 system with constant density and constant pressure differential maintaining means for a high-voltage switchgear Expired - Lifetime US3614355A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL686805638A NL149942B (nl) 1968-04-22 1968-04-22 Gesloten schakelinrichting voor hoge spanning, die gevuld is met gas, waarvan de dichtheid in afhankelijkheid van de bedrijfsomstandigheden wordt geregeld.

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US3614355A true US3614355A (en) 1971-10-19

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US (1) US3614355A (ja)
JP (1) JPS5130665B1 (ja)
FR (1) FR2006694A1 (ja)
GB (1) GB1228101A (ja)
NL (1) NL149942B (ja)
SE (1) SE371342B (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849618A (en) * 1972-05-16 1974-11-19 Bbc Brown Boveri & Cie Gas supply plant for compressed gas-insulated switchgear
US4045634A (en) * 1975-01-16 1977-08-30 Hitachi, Ltd. Gas insulated switch-gear apparatus
US4687890A (en) * 1985-06-25 1987-08-18 Mitsubishi Denki Kabushiki Kaisha Gas insulated switchgear
WO2000017975A1 (en) * 1998-09-17 2000-03-30 Abb Trasmissione & Distribuzione Spa Gas-insulated switching device
US8522817B1 (en) * 2010-12-28 2013-09-03 Jefferson Science Associates, Llc Apparatus and method for fast recovery and charge of insulation gas
CN105470850A (zh) * 2015-12-03 2016-04-06 河南平高电气股份有限公司 一种气体绝缘金属封闭开关设备及其气体密度监测装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH541864A (de) * 1972-11-08 1973-09-15 Sprecher & Schuh Ag Druckgasschalter
CN110487670B (zh) * 2019-09-04 2024-06-21 上海乐研电气有限公司 一种具有在线自校验功能的气体密度继电器及其校验方法

Citations (8)

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GB938165A (en) * 1961-03-24 1963-10-02 Westinghouse Electric Corp Electric circuit interrupter
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US3280288A (en) * 1963-03-28 1966-10-18 Bbc Brown Boveri & Cie Compressed gas circuit breaker with closed gas circuit
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US3303310A (en) * 1959-03-04 1967-02-07 Westinghouse Electric Corp Dual-pressure circuit interrupter control device
US3129309A (en) * 1960-04-12 1964-04-14 Westinghouse Canada Ltd Temperature-compensated pressure switches for controlling gas blast circuit interrupters
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US3359390A (en) * 1964-06-10 1967-12-19 Bbc Brown Boveri & Cie Compressed gas circuit breaker with circulating system for compressed gas
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US3423553A (en) * 1965-07-28 1969-01-21 Siemens Ag Arc-extinguishing apparatus for electric switches
US3405249A (en) * 1965-10-28 1968-10-08 Kim Yong Won Electric water heating container with water level responsive heater control means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849618A (en) * 1972-05-16 1974-11-19 Bbc Brown Boveri & Cie Gas supply plant for compressed gas-insulated switchgear
US4045634A (en) * 1975-01-16 1977-08-30 Hitachi, Ltd. Gas insulated switch-gear apparatus
US4687890A (en) * 1985-06-25 1987-08-18 Mitsubishi Denki Kabushiki Kaisha Gas insulated switchgear
WO2000017975A1 (en) * 1998-09-17 2000-03-30 Abb Trasmissione & Distribuzione Spa Gas-insulated switching device
US6444937B1 (en) 1998-09-17 2002-09-03 Abb Trasmissione & Distribuzione Spa Gas-insulated switching device
US8522817B1 (en) * 2010-12-28 2013-09-03 Jefferson Science Associates, Llc Apparatus and method for fast recovery and charge of insulation gas
CN105470850A (zh) * 2015-12-03 2016-04-06 河南平高电气股份有限公司 一种气体绝缘金属封闭开关设备及其气体密度监测装置
CN105470850B (zh) * 2015-12-03 2018-06-08 河南平高电气股份有限公司 一种气体绝缘金属封闭开关设备及其气体密度监测装置

Also Published As

Publication number Publication date
DE1790134A1 (de) 1970-06-04
JPS5130665B1 (ja) 1976-09-02
NL6805638A (ja) 1969-10-24
NL149942B (nl) 1976-06-15
SE371342B (ja) 1974-11-11
GB1228101A (ja) 1971-04-15
DE1790134B2 (de) 1976-07-29
FR2006694A1 (ja) 1970-01-02

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