US3701867A - Double pressure compressed air electric apparatus having an air drying device - Google Patents

Double pressure compressed air electric apparatus having an air drying device Download PDF

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US3701867A
US3701867A US119255A US3701867DA US3701867A US 3701867 A US3701867 A US 3701867A US 119255 A US119255 A US 119255A US 3701867D A US3701867D A US 3701867DA US 3701867 A US3701867 A US 3701867A
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pressure
air
low
enclosure
atmosphere
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US119255A
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Jean Claude Henry
Gerard Billon
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Merlin Gerin SA
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Merlin Gerin SA
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/53Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/57Recuperation of liquid or gas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/53Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56Gas reservoirs
    • H01H33/562Means for avoiding liquefaction or for disposing of liquefaction products

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  • the device for the recovery of dry air and circulation in a substantially closed cycle which comprises a drier provides a satisfactory solution by decreasing the use of the absorbent material.
  • the feed air continuously passes through the drying deviceof absorbent filter inserted in the circulation system, but once dry it deposits therein merely traces of moisture-resulting from possible slight leaks which are compensated for by an addition of ambient air.
  • the filter retains its absorbent properties longer the more limited are the quantities of ambient air introduced into the circulation system.
  • the example selected consists of a compressed-air circuit interrupter which operates in closed cycle, but
  • the invention may naturally find other applications inany electric apparatus utilizing two compressed air pressures and subject to leaks which make aninterrnittent addition of moist outer air necessary.
  • a compressed-air circuit interrupter has two arc-extinguishing chambers 10, 12 borne by a hollow support insulator 1 4 secured at its lower end to a low-pressure, enclosure or tank 16 which is located in a zone of ground potential in such a manner that the inside of the insulator 14 communicates normallyhermetically with the tank 16.
  • An insulating conduit 18 extending the insulator 14 connects the highand low-potential zones and feeds the chambers I0, 12 with highpressurized air.
  • the air forwarded by the conduit 18 can feed auxiliary high-pressure tanks located in the region of high potential or directly feed arc blast devices or pneumatic control devices for the contacts (not shown) located in the chambers.
  • a Compressor 20 which, via a conduit 24, in
  • the suction or intake conduit 35 of the compressor 20 is connected to a three-way valve or pneumatic relay 36 comprising a valve member '37 which cooperates with two stationary valve seats 38 and 39 in order to establish a selective communication on the
  • An object of the invention is to provide an economione hand between the conduit 35 and the inside of the low-pressure enclosure 16, by means of a passage 42 when it is applied against the seat 39 and on the other hand between the conduit 35 and the atmosphere, via tube 40 provided with an air-drying filter 41, when it is applied against the seat-38.
  • a compression spring 43 biases the valve towards said second position (lefthand position) and an electrically operated pilot valve 44, the coil 45 of which may be excited by a source of current 46 by means of a pressure contact 47 sensitive to the pressure in the enclosure 16, makes it possible to admit compressed air of high pressure coming from the tank 28 through a conduit 48 behind a diaphragm 49 in order to bring the valve 37 to its first (righthand) position, which is its position of normal operation.
  • Exhaust valves 54, 56 shown schematically and associated with the arc-extinguishing chambers 10, 12, respectively, discharge into a space 58 which communicates hermetically with the inside of the hollow insulator 14.
  • the space 58, the hollow insulator 14 and the housing 16 constitute a low-pressure enclosure for the recovery of the air escaping from the chambers 10, 12 through the valves 54 and 56.
  • the recovery enclosure is adapted to communicate I with the ambient atmosphere only throughthe discharge valve 30.
  • the compressed-air circuit interrupter in accordance with the invention operates in the following manner:
  • the valve 37 Under the action of the spring 43, is in its second position of rest shown in the drawing.
  • the starting of the vcompressor-20 (which is driven in a conventional manner which does not form part of the present invention) causes the tank 28 and chambers and 12 to be placed under high pressure (for instance 15 bars) via the tube 18, the compressor taking air in through the tubes 35 and 40 from the outside atmosphere, the air drawn in being dried by the filter 4.1.
  • the compressor stops.
  • the low-pressure enclosure 58, 14 and 16 is also placed under pressure either independently or after. an operation of the exhaust valves 54 and 56.
  • the manostat 47 which is set at this value, closes and excites the coil 45 of thepilot valve 44 which opens, admitting the pressure from the tank 28 through the conduit 48 behind the diaphragm 49.
  • the valve 37 then immediately moves towards its first position of rest, coming against the seat 39, separating the enclosure 16- from the open air and establishing communication between the intake conduit 35 and the inside of the enclosure 16.
  • the compressor Upon' the subsequent operation of the compressor, in particular after an opening operation of the circuit interrupter resulting in a drop of pressure .in the tank 28, the compressor reestablishes the high pressure in said tank 28, taking air only from the enclosure 16.
  • the high-pressure air admitted into the arc-extinguishing chambers 10, 12 and serving, inter alia, for the blowing of the arcs escapes through the valves 54, 56 and is collected in the low-pressure enclosure 58, 16, causing therein a normal increase in the pressure which is insufficient to open the discharge valve 30.
  • the high-pressure air supplied to the chambers 1.0, 12 is taken by the conduit 18 from the high-pressure tank 28 and causes therein a drop in pressure which is sufi'rcient to cause the operation of the compressor which may, for instance, be governed by amanostat (not shown).
  • the compressor 20 takes air in from the enclosure 16 and again feeds the high-pressure tank 28 through the airdrying filter 26 so as .to re-establish therein the nominal high pressure which causes the stopping of the compressor. It is easy to see that the air circulates in closed cycle, the expanded air which escapes from the arc- 4 extinguishing. chambers 10, 12 being taken up again by the compressor 20 and returned via the conduit 18 into the chambers l0, 12. The air upon each cycle passes through the drying device 26 which eliminates the moisture from it, if there subsists any. v
  • a substantial leak of the high-pressure region towards the low-pressure region can cause a relative excess pressure in the enclosure 16 and the opening of the safety valve 30.
  • This discharge of dry air has the same consequences as the said accidental leaks, specifically a decrease in thequantity of air in the closed circuit which is compensated for upon the operation of the compressor 20 by an admission of air through the conduit 40.
  • a slight internal leak will have no effect on the airdrying devices, the dry air which escapes from the high pressure being automatically recovered in the enclosure 16 and therefore kept in the normal circulation circuit. The only effect is a more frequent operation of the compressor.
  • FIG. 2 shows another embodiment in which parts identical or similar to those in FIG. 1 have been designated by the same reference numbers.
  • the housing l6' freely communicates with the atmospheric air, for instance through grids 62, the low-pressure tank being now separate from said housing and spaced from the high-pressure.
  • a closed cycle double pressure compressed-air electric apparatus disposed in atmospheric air comprising a high-pressure compressed-air enclosure, a low-pressure compressed-air enclosure carrying compressed air having a pressure greater than the I atmospheric pressure, conduit means connecting said high-pressure compressed-air enclosure to the atmosphere, air-drying means inserted in said conduit means, compressor means in said conduit means, and pressure'responsive three-way valve means inserted in said conduit means between said compressor means and the atmosphere and also connected to said lowpressure compressed air enclosure, said three-way valve means being responsive to the pressure of said low-pressure compressed air enclosure and adapted to closure and to the atmosphere upon an abnormal drop of pressure therein below a predetermined pressure greater than the atmospheric pressure, and air-drying means to dry the air taken by said compressor from the air to said arc-extinguishing means, a low-pressure tank connect said compressor means selectively to said lowpressure compressed air enclosure and to the atmosphere in a manner such that said compressor means is normally connected to said low-pressure compressed air enclosure whereby an abnormal pressure drop in said low-pressure enclosure causes said valve means
  • a closed cycle double pressure compressed air electric apparatus disposed in atmospheric air comprising a high-pressure compressed air enclosure, a low-pressure compressed air enclosure, a compressor having a high pressure outlet connected to said high pressure enclosure and an inlet, valve means connected to said inlet and adapted to connect said inlet selectively to said low-pressure enclosure and to the atmosphere, said valve means comprising pressure sensitive control means responsive to the pressure in said low-pressure enclosure to control the position of said valve means in a manner such that said valve means connect said inlet to said low-pressure enclosure under normal pressurized condition of said low-pressure encollecting exhaust air from said arc-extinguishing means, a compressor adapted to supply high-pressurized air to said high-pressure tank and to maintain the pressure therein at a predetermined value, said compressor having an inlet, valve means connected to said inlet and also to said low-pressure tank and to the atmosphere to cause said inlet to communicate selectively with said low pressure tank and with the atmosphere, said valve means comprising pressure-sensitive control means for controlling the position of said valve means

Abstract

Double pressure compressed air electric apparatus such as an air-blast circuit interrupter having a high-pressure tank and a low-pressure (exhaust) tank whereby the low-pressure is greater than the atmospheric pressure under normal operating conditions. A compressor taking air from the low-pressure tank supplies highpressure air to the high-pressure tank. A three-way valve cooperating with an air-drying device causes said compressor to take air from the atmosphere in case the low-pressure drops to a dangerous value under the influence of a leakage in the system. The additional quantity of air taken from the atmosphere is dried by the air-drying device.

Description

Henry et al;
United States Patent} '6 I [151 3,701,867 451 Oct. 31, 1972 [54] DOUBLE PRESSURE COMPRESSED AIR ELECTRIC APPARATUS HAVING AN AIR DRYING DEVICE t f Inventors: Jean Claude Henry; GerardfBillon, both of Grenoble, France j A Assignee: Merlin Gerin, Anonyme,
Grenoble, France Filed: Feb. 26, 1971 .Appl; No.2 119,255
[so] Foreign Application Priority pm March 4, 1970 Fr-611 ..-....'.70o7s17.
[561 References Cited UNITED sTATEs PATENTS us. (:I.....'.. .2o0/14s j 2001148 B: .Int.(1l.., .I..H01h 33/57; j Field 6: Search .200/148 12,148 G, 148R FOREIGN PATENTS oR APPLICATIONS 1 696,066 10/1964 Canada ..200/l48E 1,178,925 r 5/1961 Germany ..200/148R Primary Examiner-Robert S. Macon v Attorney-Stevens, Davis, Miller 8; Mosher 571' ABSTRACT Double pressure compressed air electric I apparatus such as an air-blast circuit interrupter having a highpressure tank and a low-pressure (exhaust) tank whereby the low-pressure is greater than the atmospheric pressure under normal operating conditions.JA compressor taking air from the low-pressure tank supplies high-pressure air to the high-pressure tank. Athree-way valve cooperating with .an-air-drying device causes said compressor to take air from the atmosphere in case the low-pressure drops to :1 dangerous value under the influence of a leakage in the 2,550,886 5/1951 Th6mps6n,........ .2o0/14sEX 3,566,062 2/1971 Meier"; .L.200/148E system. The additional quantity of air taken from the atmosphere is dried by the air-drying device.
3 Claims, Drawing Figures PATENTKDDBIM IQR 3.701.867-
sum 1 OF 2 PATENTED nm 3 1 m2 SHEET 2 BF 2 all I I1 DOUBLE COMPRESSED AIR ELECTRIC APPARATUS HAVING AN AIR DRYING I on air-blast circuit interrupters is well known,-and particularly the danger of condensation on the insulating walls, which causes flash-over. Consequently, the conventional compressor groups for compressed air circuit interrupters must be equipped with water separators and/or air drying devices which constitute large and bulky systems which must treat'large quantities of air to be'evacuated into the atmosphere .after only a single use. 1
- It is well known that the drying of the air is readily effected by contacting itlwithab'sorben t products, but thesedevices can bedesigned only for the treatment of small quantities-of air since the absorption capacity of According to the invention, means are provided to sure tank whereby an air-drying device dries the air these products islimited. The-frequentreplacement or regeneration of the absorbent products are incompatible with the. normal maintenance .of electrical app'aratus under economical conditions.
The applicant, in its copending patent application filed on Oct. 16, 1969, under Ser. No; 867.012, has disclosed a device of the type mentioned in which the normal pressure prevailing in the low-pressure'enclosure is close to atmospheric pressure, an inlet valve causing atmospheric air to enter said enclosure when the pressure therein drops below a predetermined value as the result of a leakage of compressed air towards the outside. This system permits the circuit interrupter to operate normally in closed cycle with a quantity of air which has been dried once and for all,- an additional quantity i of air being introduced from the atmosphere" in a limited way only in the event of a leakage from the system towards the outside. device for the recovery of dry air and circulation in a substantially closed cycle which comprises a drier provides a satisfactory solution by decreasing the use of the absorbent material. As a matter of fact, the feed air continuously passes through the drying deviceof absorbent filter inserted in the circulation system, but once dry it deposits therein merely traces of moisture-resulting from possible slight leaks which are compensated for by an addition of ambient air. The filter retains its absorbent properties longer the more limited are the quantities of ambient air introduced into the circulation system.
This system has given full satisfaction in practice but cannot be used in case the low pressure value is substantially higher than atmospheric pressure, such as of the order of 4 bars.
thus introduced in the substantially closed cycle y m Other advantages and features will become evident from the following description of two embodiments of the invention which are shown schematically, partially in axial section, in the accompanying drawings by way of illustration and not of limitation.
The example selected consists of a compressed-air circuit interrupter which operates in closed cycle, but
'the invention may naturally find other applications inany electric apparatus utilizing two compressed air pressures and subject to leaks which make aninterrnittent addition of moist outer air necessary.
In FIG. 1, a compressed-air circuit interrupter has two arc-extinguishing chambers 10, 12 borne by a hollow support insulator 1 4 secured at its lower end to a low-pressure, enclosure or tank 16 which is located in a zone of ground potential in such a manner that the inside of the insulator 14 communicates normallyhermetically with the tank 16. An insulating conduit 18 extending the insulator 14 connects the highand low-potential zones and feeds the chambers I0, 12 with highpressurized air. Depending on the type of circuit interrupter used, the air forwarded by the conduit 18 can feed auxiliary high-pressure tanks located in the region of high potential or directly feed arc blast devices or pneumatic control devices for the contacts (not shown) located in the chambers.
Within the low-pressure housing or tank 16 there is arrange a Compressor 20 which, via a conduit 24, in
' which an air-drying filter 26 is also inserted, feeds a high-pressure tank 28, which is also housed within the low-pressure tank 16. Theconduit'lS is connected to the tank 28.
1A discharge or excess-pressure valve 30, urged towards its closed position by acompressionspring 32, closes a discharge orifice 34 of the tank 116 in sucha manner thatit opens automaticallylupon a.predetermined excess pressure within. the tank 16 and allows they air to. escape towards the atmosphere; while preventing any admission of air towards the'tank 16.
The suction or intake conduit 35 of the compressor 20 is connected to a three-way valve or pneumatic relay 36 comprising a valve member '37 which cooperates with two stationary valve seats 38 and 39 in order to establish a selective communication on the An object of the invention is to provide an economione hand between the conduit 35 and the inside of the low-pressure enclosure 16, by means of a passage 42 when it is applied against the seat 39 and on the other hand between the conduit 35 and the atmosphere, via tube 40 provided with an air-drying filter 41, when it is applied against the seat-38. A compression spring 43 biases the valve towards said second position (lefthand position) and an electrically operated pilot valve 44, the coil 45 of which may be excited by a source of current 46 by means of a pressure contact 47 sensitive to the pressure in the enclosure 16, makes it possible to admit compressed air of high pressure coming from the tank 28 through a conduit 48 behind a diaphragm 49 in order to bring the valve 37 to its first (righthand) position, which is its position of normal operation.
3 Exhaust valves 54, 56, shown schematically and associated with the arc-extinguishing chambers 10, 12, respectively, discharge into a space 58 which communicates hermetically with the inside of the hollow insulator 14. The space 58, the hollow insulator 14 and the housing 16 constitute a low-pressure enclosure for the recovery of the air escaping from the chambers 10, 12 through the valves 54 and 56. The recovery enclosure is adapted to communicate I with the ambient atmosphere only throughthe discharge valve 30.
The compressed-air circuit interrupter in accordance with the invention operates in the following manner:
' At the start, the valve 37, under the action of the spring 43, is in its second position of rest shown in the drawing. The starting of the vcompressor-20 (which is driven in a conventional manner which does not form part of the present invention) causes the tank 28 and chambers and 12 to be placed under high pressure (for instance 15 bars) via the tube 18, the compressor taking air in through the tubes 35 and 40 from the outside atmosphere, the air drawn in being dried by the filter 4.1. When the desired high pressure is reached, the compressor stops. The low- pressure enclosure 58, 14 and 16 is also placed under pressure either independently or after. an operation of the exhaust valves 54 and 56. As soon 'as the pressure in said enclosure 58, 14, 16 reaches a predetermined value which may be of the order of 4 bars, the manostat 47, which is set at this value, closes and excites the coil 45 of thepilot valve 44 which opens, admitting the pressure from the tank 28 through the conduit 48 behind the diaphragm 49. The valve 37 then immediately moves towards its first position of rest, coming against the seat 39, separating the enclosure 16- from the open air and establishing communication between the intake conduit 35 and the inside of the enclosure 16. Upon' the subsequent operation of the compressor, in particular after an opening operation of the circuit interrupter resulting in a drop of pressure .in the tank 28, the compressor reestablishes the high pressure in said tank 28, taking air only from the enclosure 16. The pressure normally prevailing in the enclosure 16, that is to say, during the normal operation of the circuit interrupter, is not sufficiently high to open the valve 30 nor sufiiciently low to open the contacts 47 so that the valve 44 remains normally open and the valve 36 remains in its righthand position (not shown in the figure).
During an operation of the circuit interrupter, the high-pressure air admitted into the arc-extinguishing chambers 10, 12 and serving, inter alia, for the blowing of the arcs escapes through the valves 54, 56 and is collected in the low- pressure enclosure 58, 16, causing therein a normal increase in the pressure which is insufficient to open the discharge valve 30. The high-pressure air supplied to the chambers 1.0, 12 is taken by the conduit 18 from the high-pressure tank 28 and causes therein a drop in pressure which is sufi'rcient to cause the operation of the compressor which may, for instance, be governed by amanostat (not shown). The compressor 20 takes air in from the enclosure 16 and again feeds the high-pressure tank 28 through the airdrying filter 26 so as .to re-establish therein the nominal high pressure which causes the stopping of the compressor. It is easy to see that the air circulates in closed cycle, the expanded air which escapes from the arc- 4 extinguishing. chambers 10, 12 being taken up again by the compressor 20 and returned via the conduit 18 into the chambers l0, 12. The air upon each cycle passes through the drying device 26 which eliminates the moisture from it, if there subsists any. v
I In normal operation, the drying products of the filter .26 are no longer called upon to actas soon as the volume of air included dried.
In the case of a leakage from the closed circuit towards the outside environment, the quantity of gas included in this system decreases and the drop of pressure in the enclosure 16 resulting therefrom causes the in the closed circuit has been opening of. the contacts 47 as soon as the pressure drops belowthe set value of this manostat and thus the closing of the pilot valve 44 which causes the valve 36 to move towards the position shown in the drawing. Upon the subsequent operation of the compressor 20, an amount of air necessary for the proper operation of the device is drawn inby the compressor via the conduits 35, 40 and dried by passage through the filterv 41 and through the filter 26. The quantity of air to be dried is equivalent to the leaks and therefore has nothing in common with those used in the conventional circuit interrupters which' evacuate all the expanded exhaust air to the atmosphere. After restoring of the pressure in tank 16 to the normal operating pressure, the contacts of the manostat 47 close and re-open pilot valve 44.
A substantial leak of the high-pressure region towards the low-pressure region can cause a relative excess pressure in the enclosure 16 and the opening of the safety valve 30. This discharge of dry air has the same consequences as the said accidental leaks, specifically a decrease in thequantity of air in the closed circuit which is compensated for upon the operation of the compressor 20 by an admission of air through the conduit 40. A slight internal leak will have no effect on the airdrying devices, the dry air which escapes from the high pressure being automatically recovered in the enclosure 16 and therefore kept in the normal circulation circuit. The only effect is a more frequent operation of the compressor. v
FIG. 2 shows another embodiment in which parts identical or similar to those in FIG. 1 have been designated by the same reference numbers.
In this embodiment, the housing l6' freely communicates with the atmospheric air, for instance through grids 62, the low-pressure tank being now separate from said housing and spaced from the high-pressure.
tank 28. The inside of the support insulator 14 commu nicates with the tank 60 via a conduit 64 and the manometric switch 47 and the discharge valve 30 are now, of course, associated with this tank 60 which communicates with the valve 36 via a conduit 66 (corresponding to the passage 42 of FIG. 1). The conduit 40 discharges within the housing 16 and the operation of this device is identical to that of the device of FIG. 1, except for the different arrangement in space of the different parts.
What is claimed is:
1. A closed cycle double pressure compressed-air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed-air enclosure, a low-pressure compressed-air enclosure carrying compressed air having a pressure greater than the I atmospheric pressure, conduit means connecting said high-pressure compressed-air enclosure to the atmosphere, air-drying means inserted in said conduit means, compressor means in said conduit means, and pressure'responsive three-way valve means inserted in said conduit means between said compressor means and the atmosphere and also connected to said lowpressure compressed air enclosure, said three-way valve means being responsive to the pressure of said low-pressure compressed air enclosure and adapted to closure and to the atmosphere upon an abnormal drop of pressure therein below a predetermined pressure greater than the atmospheric pressure, and air-drying means to dry the air taken by said compressor from the air to said arc-extinguishing means, a low-pressure tank connect said compressor means selectively to said lowpressure compressed air enclosure and to the atmosphere in a manner such that said compressor means is normally connected to said low-pressure compressed air enclosure whereby an abnormal pressure drop in said low-pressure enclosure causes said valve means to connect said compressor means to the atmosphere.
2. A closed cycle double pressure compressed air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed air enclosure, a low-pressure compressed air enclosure, a compressor having a high pressure outlet connected to said high pressure enclosure and an inlet, valve means connected to said inlet and adapted to connect said inlet selectively to said low-pressure enclosure and to the atmosphere, said valve means comprising pressure sensitive control means responsive to the pressure in said low-pressure enclosure to control the position of said valve means in a manner such that said valve means connect said inlet to said low-pressure enclosure under normal pressurized condition of said low-pressure encollecting exhaust air from said arc-extinguishing means, a compressor adapted to supply high-pressurized air to said high-pressure tank and to maintain the pressure therein at a predetermined value, said compressor having an inlet, valve means connected to said inlet and also to said low-pressure tank and to the atmosphere to cause said inlet to communicate selectively with said low pressure tank and with the atmosphere, said valve means comprising pressure-sensitive control means for controlling the position of said valve means responsive-to the value of the pressure in said low-pressure tank so that said inlet is connected to said low-pressure tank under normal pressurized condition thereof and to atmosphere upon a drop of said value of the pressure in said low pressure tank below a predetermined pressure value greater than the atmospheric pressure to cause said compressor to take air from the atmosphere until said normal pressurized condition is restored, and air-drying means to dry the air taken by said compressor from the atmosphere.

Claims (3)

1. A closed cycle double pressure compressed-air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed-air enclosure, a low-pressure compressed-air enclosure carrying compressed air having a pressure greater than the atmospheric pressure, conduit means connecting said high-pressure compressed-air enclosure to the atmosphere, air-drying means inserted in said conduit means, compressor means in said conduit means, and pressure responsive three-way valve means inserted in said conduit means between said compressor means and the atmosphere and also connected to said low-pressure compressed air enclosure, said three-way valve means being responsive to the pressure of said low-pressure compressed air enclosure and adapted to connect said compressor means selectively to said lowpressure compressed air enclosure and to the atmosphere in a manner such that said compressor means is normally connected to said low-pressure compressed air enclosure whereby an abnormal pressure drop in said low-pressure enclosure causes said valve means to connect said compressor means to the atmosphere.
2. A closed cycle double pressure compressed air electric apparatus disposed in atmospheric air, comprising a high-pressure compressed air enclosure, a low-pressure compressed air enclosure, a compressor having a high pressure outlet connected to said high-pressure enclosure and an inlet, valve means connected to said inlet and adapted to connect said inlet selectively to said low-pressure enclosure and to the atmosphere, said valve means comprising pressure sensitive control means responsive to the pressure in said low-pressure enclosure to control the position of said valve means in a manner such that said valve means connect said inlet to said low-pressure enclosure under normal pressurized condition of said low-pressure enclosure and to the atmosphere upon an abnormal drop of pressure therein below a predetermined pressure greater than the atmospheric pressure, and air-drying means to dry the air taken by said compressor from the atmosphere.
3. A substantially closed-cycle air blast circuit interrupted comprising arc-extinguishing means, a high-pressure tank supplying high-pressurized compressed air to said arc-extinguishing means, a low-pressure tank collecting exhaust air from said arc-extinguishing means, a compressor adapted to supply high-pressurized air to said high-pressure tank and to maintain the pressure therein at a predetermined value, said compressor having an inlet, valve means connected to said inlet and also to said low-pressure tank and to the atmosphere to cause said inlet to communicate selectively with said low pressure tank and with the atmosphere, said valve means comprising pressure-sensitive control means for controlling the position of said valve means responsive to the value of the pressure in said low-pressure tank so that said inlet is connected to said low-pressure tank under normal pressurized condition thereof and to atmosphere upon a drop of said value of the pressure in said low pressure tank below a predetermined pressure value greater than the atmospheric pressure to cause said compressor to take air from the atmosphere until said normal pressurized condition is restored, and air-drying means to dry the air taken by said compressor from the atmosphere.
US119255A 1970-03-04 1971-02-26 Double pressure compressed air electric apparatus having an air drying device Expired - Lifetime US3701867A (en)

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US4845378A (en) * 1987-03-02 1989-07-04 Bbc Brown Boveri Ag Emp generator
EP1207603A2 (en) * 2000-11-20 2002-05-22 Mitsubishi Denki Kabushiki Kaisha Gas-insulated switching apparatus
CN109565158A (en) * 2016-08-19 2019-04-02 西门子股份公司 Power transfer and life cycle management

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DE3023501A1 (en) * 1980-06-24 1982-01-14 Brown, Boveri & Cie Ag, 6800 Mannheim Combined base and control unit for outdoor circuit breaker - incorporates hydraulic reservoirs, actuators, pumps and ancillary equipment in one enclosure
CN107610969B (en) * 2017-08-22 2019-01-29 国网山东省电力公司济南供电公司 A kind of breaker SF6 gas real time monitoring and electrification making-up air device

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CA696066A (en) * 1960-06-17 1964-10-13 The English Electric Company Limited Gas blast circuit-breakers
US3566062A (en) * 1969-07-28 1971-02-23 Ite Imperial Corp Heater arrangement for sf-6 circuit breakers

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CA696066A (en) * 1960-06-17 1964-10-13 The English Electric Company Limited Gas blast circuit-breakers
DE1178925B (en) * 1961-05-25 1964-10-01 Continental Elektro Ind Ag Pressurized gas switch with switching point arranged inside a pressurized gas container
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
US4845378A (en) * 1987-03-02 1989-07-04 Bbc Brown Boveri Ag Emp generator
EP1207603A2 (en) * 2000-11-20 2002-05-22 Mitsubishi Denki Kabushiki Kaisha Gas-insulated switching apparatus
EP1207603A3 (en) * 2000-11-20 2004-09-22 Mitsubishi Denki Kabushiki Kaisha Gas-insulated switching apparatus
CN109565158A (en) * 2016-08-19 2019-04-02 西门子股份公司 Power transfer and life cycle management
US11509121B2 (en) 2016-08-19 2022-11-22 Siemens Aktiengesellschaft Electrical energy transmission device and life cycle management

Also Published As

Publication number Publication date
ES388826A1 (en) 1974-02-16
AU2606871A (en) 1972-09-07
GB1290648A (en) 1972-09-27
FR2082144A5 (en) 1971-12-10
CH530081A (en) 1972-10-31
BE763734A (en) 1971-08-02
CA926897A (en) 1973-05-22
DE2109965A1 (en) 1971-09-30

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