EP1638124A1 - Sectionneur de terre - Google Patents

Sectionneur de terre Download PDF

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Publication number
EP1638124A1
EP1638124A1 EP04022004A EP04022004A EP1638124A1 EP 1638124 A1 EP1638124 A1 EP 1638124A1 EP 04022004 A EP04022004 A EP 04022004A EP 04022004 A EP04022004 A EP 04022004A EP 1638124 A1 EP1638124 A1 EP 1638124A1
Authority
EP
European Patent Office
Prior art keywords
knife
lever
fixed contact
conductor
dangerous
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.)
Withdrawn
Application number
EP04022004A
Other languages
German (de)
English (en)
Inventor
Biasi Giovanni De
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP04022004A priority Critical patent/EP1638124A1/fr
Priority to ITMI20051650 priority patent/ITMI20051650A1/it
Publication of EP1638124A1 publication Critical patent/EP1638124A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/003—Earthing switches

Definitions

  • the present invention relates to an earthing switch device.
  • switch devices of the type used in those places where, as the result of a fault or other problem, a conductor is able to assume voltages dangerous to man; in such cases the device is required to intervene to connect the conductor to an earthing system in order to limit risk to those persons who for work or other reasons lie in proximity to the conductor.
  • Devices for connecting a voltage-carrying conductor to the earthing system are currently of the "soule' switch" type, i.e. provided with a switch which at a predetermined voltage connects the conductor (negative or neutral) to the earthing system.
  • Another type of device uses semiconductor elements to connect the conductor to earth.
  • This device can be reset to its operative configuration (if the installation is operating properly), but again it is not possible to see visually that the device has operated without endangering the safety of the operator.
  • Another type of available device is the "Berlino" device, which however presents a very high intervention time and again cannot be visually seen to have operated.
  • the technical aim of the present invention is therefore to provide an earthing switch device by which the stated drawbacks of the known art are eliminated.
  • an object of the invention is to provide a device which can be reset to its operative configuration when the dangerous situation which has caused it to intervene has ceased.
  • the device of the invention can be automatically reset to its operative configuration.
  • Another object of the invention is to provide a device which can be seen visually to have operated (i.e. it enables the contact to be seen); this is very important to ensure operator safety.
  • Another object of the invention is to provide a device which presents intervention times compatible with the sector regulations; even this feature contribute to ensure operator safety.
  • a further object of the invention is to provide a device of very high closure power (up to the maximum short-circuiting values of known installations) and an opening power suitable for resetting the system even when stray currents of predetermined values are present.
  • the device of the present invention presents an opening power suitable for systems of very different type and enables both the system closure and opening interventions to be adjusted; the device can also be provided with manual in addition to automatic control.
  • Said figures show an earthing switch device indicated overall by the reference numeral 1.
  • the device 1 comprises a frame 2 carrying, rotatably connected thereto, a shaft 3 with which a knife 4 is rigid (in other embodiments of the invention the knives can be of a different number, for example two knives can be provided).
  • the knife 4 is movable and is intended to assume an operative position (shown in Figures 1-4) in which it is spaced from a fixed contact 6 (associated with a negative or neutral conductor, when the device is installed), and a safety position (shown in Figures 5-8) connected to the fixed contact 6 and to the earthing network.
  • the fixed contact 6 is of such shape and dimensions as to withstand high closure powers and is provided with a contact spring 6a and a damper 6b of elastic material to damp the closure blow, in order to protect the more fragile parts from breakage.
  • the knife 4 is connected to an automatic operating mechanism 8 ( Figures 1 and 5), arranged to move it from its operative position ( Figure 2) to its safety position ( Figure 6) when a conductor 9 connected to the fixed contact 6 assumes a dangerous voltage during operation.
  • the operating mechanism 8 comprises a manipulator unit 11 connected to a release unit 12.
  • the manipulator unit 11 comprises an elastic element 14 ( Figure 7) arranged to accumulate energy and to release it when commanded by the release unit 12.
  • the elastic element 14 stores (via the manipulator unit 11) energy during the operation of the outer shaft 24 rigid with the lever 23 which, by way of the coupling lever 21 pivoted on the pin 22, acts on the pin 20 fixed to the lever 18 which is pivoted on the shaft 3.
  • the elastic element 14 is compressed between the fixed pin 17a and the movable pin 17b, this latter rigid with the lever 33 which, when in its final position (Figure 3), is retained by the coupling lever 31 pivoted on the pin 32.
  • Figure 7 shows the initial movement position, in which the outer shaft 24 commences to rotate in the direction indicated by the arrow M1 and, by way of the lever 23 and lever 21, acts on the pin 20 to cause the lever 18 to rotate in the direction of the arrow M3.
  • the stroke of the lever 18 terminates when, by means of a return spring, the coupling lever 31 lies as a strut for the lever 33, so that when the elastic element 14 has been loaded, it cannot discharge its energy even by further rotating the lever 23 and hence removing the lever 21 from its position of thrust on the pin 20.
  • the release unit 12 ( Figures 4 and 8) is formed as a coil with movable armature 38 which, when power ceases, rotates the lever 35 in the direction of the arrow F1 by means of a return spring.
  • the release unit 12 can also be formed as a coil with movable armature 38a which, when powered, rotates the lever 35 in the same direction as the arrow F1.
  • Figure 3 shows the coupling of the lever 31 to the lever 33, while Figure 8 shows the effected release of the release unit 12.
  • the release operation can also be effected manually without activating the coil with movable armature 38 (or 38a). This is achieved by rotating the outer shaft 24 to rotate the lever 23 which, at the end of the slot 25, moves the pin 28 rigid with the lever 29 which in its turn acts on the coupling lever 31 via the pin 30.
  • the device for opening under load is in the form of the knife 4 which, when in its safety position, engages the contact spring (of the fixed contact 6) to connect to earth the conductor fixed to the fixed contact 6.
  • Electrically connected to the knife 4 there is also a spring mechanism (not shown) which during the slow opening operation by the motor 41, or by manual action, remains mechanically engaged with the fixed contact 6 until the knife 4 is almost completely opened. Said spring mechanism is released at this point from its mechanical coupling position and returns to its rest position parallel to the contact spring 6a (of the fixed contact 6) to hence interrupt electrical connection and return the device to its operative configuration.
  • the device 1 comprises a first sensor 40 ( Figures 4 and 8) to sense a dangerous situation and consequently activate the release unit 11; the first sensor 40 preferably comprises a voltage relay arranged to sense dangerous voltages and emit a closure signal for the device 1 (via the electromagnet 38 or 38a).
  • the device also comprises a motor 41 connected to the manipulator unit 11 for its operation.
  • the device also comprises a second sensor 42 arranged to sense that the dangerous situation has ceased and to cause the motor 41 to return the knife 4 from the safety position to the operative position; the second sensor 42 comprises a current relay.
  • the device 1 also comprises a semiconductor element or varistor 44 connected in parallel with the device 1, to limit the voltage peaks to non-dangerous values until the device 1 is closed.
  • the operation of the earthing switch device 1 of the invention is apparent from that described and illustrated and is substantially as follows.
  • the device 1 is in the configuration shown in Figure 2, i.e. the device is open and the conductor 9 (neutral or negative respectively) is isolated from earth.
  • the voltage relay 40 When a dangerous situation occurs and the conductor 9 (neutral or negative) under control assumes a dangerous voltage, the voltage relay 40 generates a signal which causes interruption of power to the electromagnet 38.
  • the end 33 of the lever 18 is hence freed and the lever 18 can rotate as indicated by the arrows F4 to enable the spring 14 to rapidly release the stored energy; this causes rapid rotation of the shaft 3 and hence rapid closure of the knife 4 which moves into contact with the fixed contact 6, to put the neutral or negative conductor on which the anomaly has been detected into a safety state.
  • the current relay 42 senses that the anomaly is no longer present, it operates the motor 41 to again separate the knife 4 from the fixed contact 6 of the device 1 and return this latter into its operative configuration.
  • the device 1 can also be returned from its safety position to its operative position manually by acting on the shaft 24 (for example by means of a crank).
  • the described device requires a certain time to pass from the operative position to the safety position. In the case of faults with very high voltages this time could be insufficient to ensure human safety.
  • the earthing switch device conceived in this manner is susceptible to numerous modifications and variants, all falling within the scope of the inventive concept; moreover all details can be replaced by technically equivalent elements.

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  • Mechanisms For Operating Contacts (AREA)
EP04022004A 2004-09-16 2004-09-16 Sectionneur de terre Withdrawn EP1638124A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04022004A EP1638124A1 (fr) 2004-09-16 2004-09-16 Sectionneur de terre
ITMI20051650 ITMI20051650A1 (it) 2004-09-16 2005-09-07 Dispositivo di sezionamento di terra

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04022004A EP1638124A1 (fr) 2004-09-16 2004-09-16 Sectionneur de terre

Publications (1)

Publication Number Publication Date
EP1638124A1 true EP1638124A1 (fr) 2006-03-22

Family

ID=34926561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04022004A Withdrawn EP1638124A1 (fr) 2004-09-16 2004-09-16 Sectionneur de terre

Country Status (2)

Country Link
EP (1) EP1638124A1 (fr)
IT (1) ITMI20051650A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2249363A1 (fr) * 2009-05-07 2010-11-10 ABB Research Ltd. Agencement, sous-station, procédé de fonctionnement et utilisation d'un commutateur de mise à la terre pour la protection d'un circuit électrique contre des défauts de court-circuit en ligne
EP2466603A1 (fr) * 2010-12-15 2012-06-20 Eaton Industries (Netherlands) B.V. Commutation de déconnecteur pour transformateur de tension
CN103489721A (zh) * 2013-10-11 2014-01-01 山东泰开高压开关有限公司 一种双断口断路器竖直装配翻转机床

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046545A1 (fr) * 1980-08-21 1982-03-03 BROWN, BOVERI & CIE Aktiengesellschaft Equipement d'installation électrique
FR2687022A1 (fr) * 1992-02-03 1993-08-06 Abb Distribusjon As Appareil de mise automatique a la terre.
FR2846478A1 (fr) * 2002-10-25 2004-04-30 Schneider Electric Ind Sas Dispositif de protection contre les surtensions a electrode mobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046545A1 (fr) * 1980-08-21 1982-03-03 BROWN, BOVERI & CIE Aktiengesellschaft Equipement d'installation électrique
FR2687022A1 (fr) * 1992-02-03 1993-08-06 Abb Distribusjon As Appareil de mise automatique a la terre.
FR2846478A1 (fr) * 2002-10-25 2004-04-30 Schneider Electric Ind Sas Dispositif de protection contre les surtensions a electrode mobile

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2249363A1 (fr) * 2009-05-07 2010-11-10 ABB Research Ltd. Agencement, sous-station, procédé de fonctionnement et utilisation d'un commutateur de mise à la terre pour la protection d'un circuit électrique contre des défauts de court-circuit en ligne
EP2466603A1 (fr) * 2010-12-15 2012-06-20 Eaton Industries (Netherlands) B.V. Commutation de déconnecteur pour transformateur de tension
WO2012080392A1 (fr) * 2010-12-15 2012-06-21 Eaton Industries (Netherlands) B.V. Commutateur de déconnexion pour transformateur de tension
CN103282989A (zh) * 2010-12-15 2013-09-04 伊顿工业(荷兰)有限公司 用于变压器的断路器开关
US8810344B2 (en) 2010-12-15 2014-08-19 Eaton Industries (Netherlands) B.V. Disconnector switch for voltage transformer
RU2581601C2 (ru) * 2010-12-15 2016-04-20 Итон Индастриз (Незерлэндс) Б.В. Переключатель разъединителя для трансформатора напряжения
CN103489721A (zh) * 2013-10-11 2014-01-01 山东泰开高压开关有限公司 一种双断口断路器竖直装配翻转机床

Also Published As

Publication number Publication date
ITMI20051650A1 (it) 2006-03-17

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