EP0002985B1 - Système de commande hydraulique pour disjoncteurs électriques - Google Patents

Système de commande hydraulique pour disjoncteurs électriques Download PDF

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Publication number
EP0002985B1
EP0002985B1 EP78400248A EP78400248A EP0002985B1 EP 0002985 B1 EP0002985 B1 EP 0002985B1 EP 78400248 A EP78400248 A EP 78400248A EP 78400248 A EP78400248 A EP 78400248A EP 0002985 B1 EP0002985 B1 EP 0002985B1
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EP
European Patent Office
Prior art keywords
control
hydraulic
valve
circuit breaker
valves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78400248A
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German (de)
English (en)
French (fr)
Other versions
EP0002985A1 (fr
Inventor
Claude Alain Gratzmuller
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0002985A1 publication Critical patent/EP0002985A1/fr
Application granted granted Critical
Publication of EP0002985B1 publication Critical patent/EP0002985B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic

Definitions

  • the present invention relates to a hydraulic control system for an electric circuit breaker, which can be operated remotely from an order transmitter.
  • a hydraulic control for a circuit breaker essentially comprises, in a known manner: an actuator for operating the movable contact of the circuit breaker; a source of pressurized hydraulic fluid; and a set of hydraulic switching members, which will be designated in the following under the term of "control unit” and which comprises at least one supply-bleed valve for the actuating cylinder, this valve being controlled towards the either of its positions by two pilot valves, called interlock valves and tripping valves, which are actuated fleetingly to cause the interlocking operation or the tripping operation of the circuit breaker.
  • control unit In modern installations, the control unit is mounted in the immediate vicinity of the cylinder, to which it is often even attached to reduce operating times and avoid losses of hydraulic loads.
  • the interlocking and tripping valves must be able to be controlled remotely from the circuit breaker, either for safety reasons or, above all, because from a single interlocking or tripping order several circuit breakers (for example the three circuit breakers mounted on the three phases of a network), or several circuit breaker modules (elementary circuit breakers mounted in series on the same phase of a network) must be tripped or tripped simultaneously. This is why, until now, only solenoid valves have been used as pilot valves for switching on and off, these solenoid valves being excited from an order transmitter located at a suitable distance from the point or points. circuit breakers.
  • Circuit breaker controls of the aforementioned type are well known and have been described for example in publication FR-A - 1,098,565 and in publication FR-E-67,250, as well as in publication FR-A - 1,355,701 all of these publications in the name of Jean Louis Gratzmuller.
  • control blocks not only included hydraulic equipment, but also electrical equipment, which generally required the installation, in the immediate vicinity of each circuit breaker or module, of a cabinet containing these equipment , another cabinet known as a "control cabinet” being of course provided to house the hydraulic and electrical safety equipment, for controlling the open or closed position of the circuit-breaker (s) and for transmitting, after checking the possibilities of execution, orders from of the order issuer.
  • hydraulic connections some of which have a large section, and electrical connections were to unite the control cabinet with the control block of each circuit breaker.
  • each control unit can comprise only hydraulic equipment, the pilot valves being controlled by hydraulic signals, so that all electrical system is eliminated on the modules.
  • This also has the advantage that the connections between each control unit and the control cabinet can be uniquely hydraulic connections produced in small section pipes.
  • each control unit being a purely hydraulic device, it can be produced in the form of a sealed unit which does not require the installation of an individual cabinet for each circuit breaker or each circuit breaker module.
  • the subject of the invention is a hydraulic control system of the aforementioned type, as described in publication FR-A-2 11 506 in which: each of the pilot valves is controlled by a hydraulic device attached to the pilot valve, said device being sensitive to a drop in pressure appearing in a low flow control pipe and bringing the corresponding pilot valve into its active position in response to such a drop in pressure; said control pipes lead to the aforementioned control cabinet; each of said pipes is provided, in the control cabinet, with a fugitively actuable purge electro-valve and constituting respectively the latching control member and the tripping control member; and means are provided for continuously replenishing at low flow rate and for normally maintaining said high pressure pipes and hydraulic devices under high pressure outside the transient periods of venting said purge valves.
  • the pilot valves being controlled by a pressure drop signal transmitted by the control pipes, the response times between sending the order from the control cabinet and executing (switching on or off) of the order are very brief, since there is no need for said pipes to be purged up to atmospheric pressure.
  • the invention is particularly applicable to the control of circuit breakers of the elastic return type towards the tripped position and maintained in the latched position after disappearance of the fugitive latching signal, by a self-maintaining hydraulic circuit forming part of the control unit.
  • Such hydraulic controls have been described in the aforementioned French patents.
  • the pilot trigger valve which is controlled by a drop in pressure in the corresponding control pipe, is a purge valve of the self-holding hydraulic circuit provided in the control block.
  • the invention finds a particularly advantageous application for controlling a plurality of circuit breakers, or circuit breaker modules, from a single central control cabinet.
  • all of the aforementioned control pipes, leading to the hydraulic devices of the release valves of all the circuit breakers, are connected together, to the central cabinet, to a single purge valve, constituting a single trip, momentarily actuated, for the plurality of circuit breakers.
  • all of the aforementioned control lines leading to the hydraulic devices of the interlocking valves of all the circuit breakers are connected together in the central control cabinet, to a single purge valve constituting a single interlocking member for the plurality of circuit breakers. .
  • FIG. 1 An electrical circuit breaker shown schematically by its movable contact 2 and its two fixed contacts 4 and 6, the movable contact being actuated by the rod 8 of a hydraulic cylinder 10.
  • the circuit breaker shown is of the elastic return type permanent to the open position.
  • the elastic return means are constituted by a spring 11, but they could be constituted by a fluid under pressure.
  • the control unit 12 essentially comprises a supply-purge valve 14 suitable for establishing either the communication (connection 16) between the jack 10 and a source of pressurized liquid such as a hydropneumatic accumulator 18 (circuit breaker engagement and maintenance engaged. ), or the communication (connection 20) between the jack 10 and a low pressure tank 22 (tripping of the circuit breaker).
  • the pilot valves 24-26 are actuated, no longer directly by an electrical signal, but by a hydraulic pressure drop signal.
  • pilot valves 24-26 are respectively actuated by hydraulic manostatic devices 28-30, which are attached to the corresponding pilot valve and an embodiment of which has been shown in more detail in FIG. 2.
  • Each hydraulic device 28-30 comprises a separate cylinder, by a piston 32-32 ', in two chambers 34-36 and 34'-36'.
  • the rods 38-38 'of the pistons act on the valves 40-40' of the pilot valves 24-26 of the control unit, said valves having been shown in FIG. 2 in their normal rest position.
  • the chambers 36-36 ' have an inlet 37-37' and are permanently in communication, via pipes 42, with the pressure of the accumulator 18, while the chambers 34-34 'have an inlet 35-35' and are connected to hydraulic lines 44-44 ', called “control lines”, in which the pressure can be lowered from a control cabinet 46 (FIG. 1), by means which will be described in what follows, the control cabinet 46 can be located several meters from the circuit breaker to be controlled.
  • control lines 44-44 ' which terminate in the control cabinet 46 are permanently replenished with hydraulic fluid under pressure by connection, by means of lines 48, with the accumulator 18, or alternatively, with a accumulator 18 'which can be provided in or in the vicinity of the control cabinet.
  • a purge valve 52 On the line 44 is interposed, in the control cabinet 46, a purge valve 52, which, in the normal closed position, places the line 44 in communication with the line 54 connecting with the accumulator 18 (or 18 ′). In the open position of the valve 52, the pipe 44 is placed in communication with a low-pressure tank 56.
  • a simple, two-way purge valve is used, so that in open position of the valve 52, both the pipes 44 and 54 are vented but a nozzle 58 of small cross section relative to the opening section of the purge valve is interposed on the pipe 54.
  • the purge valve 52 is preferably a solenoid valve which can be operated fleetingly by means of an ultra-fast electromagnet 60 of a type well known in the circuit-breaker controls.
  • the control line 44 'of the trigger pilot valve 26 is equipped in the same way with a purge solenoid valve 52' connected in an identical manner to what has just been described.
  • the pipe 44 decompresses and its pressure decreases by an amount at p, likewise than in chamber 34.
  • the pressure P which continues to prevail in chamber 36 exceeds the sum of the pressure P - ⁇ P in chamber 34 and the force of the spring 50, so that the piston 32 is pushed back down ( Figure 2) and opens the valve of the pilot pilot valve 24.
  • This pilot valve is for example of a type well known in circuit breaker control blocks and it establishes, in the open position, communication between a line 62 connected to the accumulator 18 and another line 64 connected to the pilot cylinder (not shown) of the main supply-purge valve, to bring the latter valve to position 16 (supply) indicated in FIG. 1. After disappearance of the fugitive engagement signal, the valve is maintained in the supply position by the hydraulic circuit of self-maintenance described in the aforementioned patents. A non-return valve 66 is interposed in a known manner on the pipe 64.
  • the pump recharges the accumulator 18 via the small section pipe 48 to the pressure P chosen, the pressures in the chambers 34 and 36 therefore always remaining equal and the pilot valve 24 therefore remaining closed.
  • the control of the pilot trigger valve 26 by the purge solenoid valve 52 ' is identical to what has just been described with regard to the control of the pilot pilot valve 24. It may simply be noted (FIG. 2 ) that the pilot valve 26, when open, puts a pipe 72 connected to the self-maintaining hydraulic circuit (not shown) of the control unit 14 into communication with a low pressure tank 74.
  • valves 24 and 26 are actuated simply by a pressure drop signal in the control lines 44-44 'without these lines needing to be purged to atmospheric pressure.
  • FIG. 1 shows a circuit breaker with elastic return to the spring-triggered position, but it is understood that the invention also applies to circuit breakers actuated by a double-acting cylinder or by a differential cylinder with hydropneumatic return.
  • FIG. 3 shows the case of two modules which are each controlled by a control block 12 or 112, identical to the control block 12 described in connection with FIG. 1 and which are located at a certain distance one of the other.
  • the two interlocking control lines 44 and 144 are connected to a common point 76 to the control cabinet 146 and a single purge solenoid valve 52 allows, when energized, to lower the pressure both in the two pipes 44 and 144, that is to say simultaneously transmitting to the two control blocks 12 and 112 the hydraulic engagement signal.
  • control lines 44-144-44'-144 ' are supplied with liquid under pressure through jets 58-58' having a much lower flow rate than the purge valves 52-52 'in the open position.
  • the user requires, for safety reasons, to be able to have several locking and especially triggering control members.
  • the present invention lends itself well to the installation of such additional members since it suffices to have, at any point of the control lines 44-44'-144-144 ', an additional purge valve, in addition to the main valve. 52 or 52 'provided in the central control cabinet.
  • FIG. 4 shows the application to an installation according to the invention of the security system against "discrepancies" which has been described in French patent application number 77 36277 filed on December 2, 1977 in the name of the same inventor, and published under the publication number FR-A-2 410 753.
  • the system essentially comprises a "discrepancy" detector constituted by a differential pressure detector 80 comprising a cylinder in which a free piston 82 determines two chambers 84-84 'maintained in permanent communication, by lines 86-86' with the chambers cylinders 10-110.
  • the device 88 controls the opening of an additional purge valve 90 disposed on the trigger control pipe 44 '(or 144').
  • the opening of the valve 90 lowers the pressure in both the pipes 44 'and 144' and therefore interrupts the switching operation of all the modules in the event of a discrepancy, since a general priority tripping order is given.
  • the control link 92 between the device 88 and the purge valve 90 can be an electrical connection or, preferably, a mechanical connection, as described in the publication FR-A-2410753.
  • circuit breakers are devices that operate with brutality and control cabinets often contain relatively fragile accessories such as recorders, relays, etc. which are often disturbed by the shocks transmitted by large section pipes.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Magnetically Actuated Valves (AREA)
EP78400248A 1978-01-04 1978-12-19 Système de commande hydraulique pour disjoncteurs électriques Expired EP0002985B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7800106 1978-01-04
FR7800106A FR2422245A1 (fr) 1978-01-04 1978-01-04 Systeme de commande hydraulique pour disjoncteurs electriques

Publications (2)

Publication Number Publication Date
EP0002985A1 EP0002985A1 (fr) 1979-07-11
EP0002985B1 true EP0002985B1 (fr) 1982-01-27

Family

ID=9203102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78400248A Expired EP0002985B1 (fr) 1978-01-04 1978-12-19 Système de commande hydraulique pour disjoncteurs électriques

Country Status (11)

Country Link
US (1) US4204461A (enrdf_load_stackoverflow)
EP (1) EP0002985B1 (enrdf_load_stackoverflow)
JP (1) JPS5497783A (enrdf_load_stackoverflow)
AT (1) AT377383B (enrdf_load_stackoverflow)
BR (1) BR7900024A (enrdf_load_stackoverflow)
CA (1) CA1123031A (enrdf_load_stackoverflow)
DE (2) DE2861589D1 (enrdf_load_stackoverflow)
FR (1) FR2422245A1 (enrdf_load_stackoverflow)
HU (1) HU184931B (enrdf_load_stackoverflow)
IN (1) IN150996B (enrdf_load_stackoverflow)
SU (1) SU1005671A3 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59158026A (ja) * 1983-02-28 1984-09-07 住友精密工業株式会社 しや断器の油圧操作回路
FR2547108B1 (fr) * 1983-05-30 1986-07-04 Gratzmuller Claude Commande oleopneumatique pour disjoncteurs electriques
JPS6132310A (ja) * 1984-07-25 1986-02-15 株式会社日立製作所 流体圧駆動装置
US4649704A (en) * 1984-12-24 1987-03-17 Shell Offshore Inc. Subsea power fluid accumulator
JPS6349435U (enrdf_load_stackoverflow) * 1986-09-12 1988-04-04
DE3631304A1 (de) * 1986-09-13 1988-03-24 Teves Gmbh Alfred Elektrohydraulische schaltvorrichtung
DE3710376A1 (de) * 1987-03-28 1988-10-13 Asea Brown Boveri Antriebseinrichtung fuer einen beweglichen kontaktarm eines elektrischen schaltgeraetes
US5060475A (en) * 1990-05-29 1991-10-29 Caterpillar Inc. Pilot control circuit for load sensing hydraulic systems
FR2685541B1 (fr) * 1991-12-23 1994-04-08 Gec Alsthom Sa Commande de disjoncteur.
CA2127744A1 (en) * 1993-07-20 1995-01-21 George P. Kokalis Hydraulic closed loop control system
US7520129B2 (en) * 2006-11-07 2009-04-21 Varco I/P, Inc. Subsea pressure accumulator systems
US8464525B2 (en) * 2007-02-07 2013-06-18 National Oilwell Varco, L.P. Subsea power fluid recovery systems
US7926501B2 (en) * 2007-02-07 2011-04-19 National Oilwell Varco L.P. Subsea pressure systems for fluid recovery

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1098565A (fr) * 1954-01-15 1955-08-08 Dispositif de commande hydraulique pour disjoncteur, ou analogue
FR1135122A (fr) * 1955-11-04 1957-04-24 Jean Louis Gratzmuller Dispositif de commande hydraulique à contrôle de vitesse, pour disjoncteur
US2948262A (en) * 1956-03-02 1960-08-09 Gratzmuller Jean Louis Pressure-limiting device
FR73695E (fr) * 1958-06-06 1960-09-05 Comp Generale Electricite Procédé de commande oléopneumatique d'appareil électrique et application à un disjoncteur
FR1324161A (fr) * 1962-06-04 1963-04-12 Continental Elektro Ind Ag Soupape d'enclenchement et de disjonction à commande préalable pour interrupteurs électriques pourvus de commande oléo-hydraulique
FR1355701A (fr) * 1963-02-06 1964-03-20 Dispositif de commande à purges multiples pour circuit hydrauliques
FR1423882A (fr) * 1964-11-24 1966-01-07 Commande hydraulique pour disjoncteur électrique
CH539940A (de) * 1971-06-04 1973-07-31 Siemens Ag Elektrischer Hochspannungs-Leistungsschalter
FR2266022B1 (enrdf_load_stackoverflow) * 1974-03-26 1976-12-17 Gratzmuller Jean Louis

Also Published As

Publication number Publication date
FR2422245B1 (enrdf_load_stackoverflow) 1982-04-16
EP0002985A1 (fr) 1979-07-11
DE2861589D1 (en) 1982-03-11
IN150996B (enrdf_load_stackoverflow) 1983-02-12
JPS5497783A (en) 1979-08-02
JPS6236333B2 (enrdf_load_stackoverflow) 1987-08-06
HU184931B (en) 1984-11-28
CA1123031A (en) 1982-05-04
ATA3879A (de) 1984-07-15
AT377383B (de) 1985-03-11
BR7900024A (pt) 1979-08-07
US4204461A (en) 1980-05-27
SU1005671A3 (ru) 1983-03-15
DE7838126U1 (de) 1979-10-25
FR2422245A1 (fr) 1979-11-02

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