EP1174894A1 - Trennschalter mit Messerkontakt und Blockierungssystem durch Überschreitung eines toten Punktes - Google Patents

Trennschalter mit Messerkontakt und Blockierungssystem durch Überschreitung eines toten Punktes Download PDF

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Publication number
EP1174894A1
EP1174894A1 EP01401945A EP01401945A EP1174894A1 EP 1174894 A1 EP1174894 A1 EP 1174894A1 EP 01401945 A EP01401945 A EP 01401945A EP 01401945 A EP01401945 A EP 01401945A EP 1174894 A1 EP1174894 A1 EP 1174894A1
Authority
EP
European Patent Office
Prior art keywords
rod
disconnector
rotation
contact
movable contact
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Withdrawn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
EP01401945A
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English (en)
French (fr)
Inventor
Ferruccio Dianin
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.)
Grid Solutions SAS
Original Assignee
Alstom SA
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 Alstom SA filed Critical Alstom SA
Publication of EP1174894A1 publication Critical patent/EP1174894A1/de
Withdrawn legal-status Critical Current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
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact
    • H01H31/283—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact wherein the contact or contacts are rectilinearly movable with respect to the carrying member

Definitions

  • a high voltage disconnector comprising a contact fixed as well as a movable contact that can slide along a movable rod in rotation about an axis, and comprising an operating mechanism comprising a rotary control shaft intended to move in rotation this rod from a first angular position to a second position angular where the rod is placed in alignment with the fixed contact.
  • the disconnector further comprises a lever integral in rotation with the shaft and cooperating with a connecting rod which is connected to the movable contact and who can slide this movable contact to insert it into the contact fixed.
  • This lever forms with the connecting rod an elbow which unfolds completely during the insertion of the movable contact to pass a neutral position where the lever and the connecting rod are aligned and beyond which this elbow is locked in abutment in a stable position.
  • Such a disconnector for example of the knife type, is particularly intended to ensure the earthing of a phase conductor which is generally connected to the fixed contact of the disconnector. It is essential that the mechanism which transmits the translational movement to the movable contact ensures a stable position of this contact once the disconnector closed, i.e. when the contacts are inserted one inside the other. In in particular, the movable contact must not be able to be released from the fixed contact under the effect of electromagnetic forces created by currents electrics of very high intensity or under the effect of vibrations that could be subjected to the disconnector when subjected to wind or tremors of earth for example. Blocking the rotation of the elbow after passage from a neutral position ensures the stable position.
  • a spring integrated into the rod implies a relatively large weight of the mobile assembly in rotation.
  • the use of a counterweight extending the device makes it possible to limit the torque to be exerted by the maneuver by its control shaft, but this has the effect of increasing the inertia of the pivoting assembly, to the detriment of the speed of the maneuvers opening and closing of the disconnector.
  • this couple must remain sufficient to overcome the compression force of the spring in order to widen the elbow and insert the movable contact into the fixed contact when disconnector closing.
  • An object of the invention is to propose a simple, economical solution, and allowing, at equivalent sectioning distance, to reduce the inertia of the disconnector while limiting the torque that must be exerted by the maneuver.
  • the invention relates to a high voltage disconnector such as defined above, characterized in that the drive shaft has an axis longitudinal substantially distinct from the axis of rotation of the rod, and the angle defined by the lever and the connecting rod increases continuously during the rotation of this rod for closing the disconnector.
  • control shaft can be arranged so as to have to rotate at an angle greater than 90 ° to obtain a 90 ° rotation of the rod. This has the consequence that the couple that must exercise the drive shaft is less on average than the torque it should be exercised if this tree coincided with the axis of rotation of the rod.
  • a stop can be mounted on the movable contact to lock the elbow in the stable position after passing neutral.
  • the lever is preferably directly articulated on the connecting rod, and the blocking of the elbow can be achieved by an arrangement of the elements so that the elbow joint comes to bear against the stop.
  • FIG. 1A is a block diagram of a disconnector according to the invention in a preferred embodiment.
  • Figure 1B is a principle representation of different positions angular (a), (b), (c) of the quadrilateral formed by the lever, the connecting rod and the movable contact, articulated on a fixed base segment joining the axis of the rod to the axis of the control shaft.
  • Figure 2 is a schematic side sectional view of a disconnector according to the invention.
  • Figure 3 is a schematic sectional top view of the disconnector in Figure 2.
  • the earthing knife isolator with insulation in air, for high and very high voltage comprises a contact fixed earthing 1 which is generally hollow and tulip shaped into which is inserted a movable contact 2 in the form of a rod.
  • the contact mobile 2 comprises a cylindrical section mounted sliding in translation on a rod 3 which itself is articulated at one of its two ends on a fixed axis 4.
  • the axis 4 is mounted on a disconnector housing more visible on the Figures 2 and 3.
  • the hollow fixed contact 1 in the form of a tulip comprises a semi-cylindrical extension 1 'which extends towards the axis 4 and which serves as a stop for an end finger 2 'of the movable contact 2 suitable for fit into the fixed contact 1.
  • the end finger 2 ' includes knives that come into abutment in housings complementary formed in the extension 1 '.
  • the rod 3 and therefore the movable contact 2 are moved in a movement angular around the axis 4 of rotation of the rod, and the movable contact 2 is then moved alone in a translational movement along the axis of the rod 3 by a rotary control shaft 5 which is arranged parallel to axis 4.
  • the rod 3 in the open position of the disconnector, the rod 3 extends horizontally and the movable contact 2 (shown in solid lines) is in a retracted position on the rod 3. In the fully closed position of the disconnector, the rod 3 extends vertically in alignment with the contact fixed 1 and the moving contact 2 (shown in broken lines) is in a advanced position on the rod 3 and is more particularly inserted in the fixed contact 1.
  • the displacement in rotation and in translation of the movable contact 2 is obtained by a lever 6 having a first end integral in rotation with the control shaft 5 and a second end connected to a first end of a connecting rod 7 by an articulation A.
  • the second end of the connecting rod 7 is connected to the movable contact 2 by a hinge B.
  • the rod 7 is shorter the lever 6 and forms therewith an angle bend ⁇ of articulation at A, this angle being for example close to 30 ° in the fully open position of the disconnector.
  • the length of the connecting rod is expected to be greater than the distance between axis 4 of rod and shaft 5.
  • the movable contact 2 During the pivoting of the rod 3, the movable contact 2 remains in position retracted on said rod until it reaches a vertical position where a stop 1 'prevents it from continuing its rotation. This retracted position is explained by the fact that for any angular position of said rod during its rotation, the sum of the forces exerted on the movable contact 2 has a component in the direction of the axis of the rod 3 which is directed towards the axis 4.
  • the thrust of the connecting rod 7 constitutes the main part of the component of said forces on the axis of rod 3.
  • This projection of said thrust on said axis decreases as the angle ⁇ increases, to become weak in front of the projection of the weight of the mobile contact 2 on the same axis to which is added part of the weight of the connecting rod 7 which applies on joint B.
  • the 90 ° rotation performed by the movable contact 2 lasts generally more than a second, and the centrifugal force exerted on said mobile contact then remains less than the weight of said contact (which amounts to say that the instantaneous centrifugal acceleration of said contact remains less than the gravitational constant).
  • a disconnector according to the invention therefore does not need a spring at the rod to prevent the movable contact from sliding.
  • the rotation of the rod is blocked when the rod 3 arrives in the vertical position.
  • the connecting rod 7 then forms with the axis of the rod 3 an angle ⁇ of the order of seventy to eighty degrees, so that the thrust F exerted by the connecting rod 7 on the contact 2 projects on said axis in a force whose standard F v is greater than a third of that of F for this preferred embodiment.
  • a stop 1 'ensuring the blocking is arranged to be applied either on the rod 3. or on the movable contact 2, or on the axis 4, or in any other way producing the same result.
  • said stop 1 ' is produced by a semi-cylindrical extension of the fixed contact 1.
  • the torque exerted by the control shaft 5 is provided sufficiently high so that the thrust F exerted by the connecting rod 7 on the movable contact 2 has a vertical component F v significantly greater than the weight of said movable contact, so as to move the latter until it is inserted into the fixed contact 1.
  • the movable contact 2 is locked in insertion in the fixed contact 1. Indeed, possible accidental stresses and relatively moderate on the lever or connecting rod will either to press the joint even more against its stop, i.e. to bring back the elbow towards its neutral position without crossing it and thus pushing the contact movable to its maximum insertion position in the fixed contact. So the weight of the moving contact, as well as the electromagnetic forces which tend to separate contacts 1 and 2, have no effect on the control of the switch. The control shaft 5 can then be uncoupled from the disconnector control without affecting the stability of the moving contact 2.
  • the controlled opening of the disconnector is carried out in applying sufficient force to the elbow, usually from a rotation of the control shaft, so that this elbow can cross its neutral position after which the moving contact disengages easily from fixed contact due in particular to its own weight.
  • the force to apply to cross the neutral point is all the greater as the value buffer chosen for angle ⁇ exceeds 180 °.
  • FIG. 1B makes it possible to view the relative positioning of the main mobile elements during the rotation. It appears that as long as the angle ⁇ between the connecting rod 7 and the axis of the rod 3 is greater than 90 °, the force F thrust of said connecting rod is directed towards the axis 4 and participates in maintaining the movable contact 2 in the retracted position on said rod, as illustrated in case a. Once ⁇ less than 90 °, the component of F on the axis of the rod 3 is directed upwards and gradually increases, as illustrated in case c.
  • the collar 11 has a section of variable thickness, and is arranged to be able to be turned around the contact 2 and locked in one of several possible angular positions, so as to be able to choose a collar thickness determined for the collar area forming stop.
  • This has the advantage of being able to adjust the abutment angle ⁇ b within a few degrees, which makes it possible to adjust the force threshold to be applied to cross the neutral point before the disconnector opens.
  • the elbow actuated by the control shaft 5 consists of two parallel levers 6.6 'and two parallel connecting rods 7.7' cradle mounted on which these levers are respectively articulated.
  • the disconnector according to the invention can be multipolar in order to constitute a only switchgear for a polyphase circuit. It then includes several 2 parallel movable contacts formed of tubes each having a length of a few meters, which are inserted into contacts respectively fixed, each formed by a ring of contact fingers.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP01401945A 2000-07-20 2001-07-19 Trennschalter mit Messerkontakt und Blockierungssystem durch Überschreitung eines toten Punktes Withdrawn EP1174894A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0009538A FR2812124B1 (fr) 2000-07-20 2000-07-20 Sectionneur a couteau avec un systeme de blocage par passage de point mort
FR0009538 2000-07-20

Publications (1)

Publication Number Publication Date
EP1174894A1 true EP1174894A1 (de) 2002-01-23

Family

ID=8852744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01401945A Withdrawn EP1174894A1 (de) 2000-07-20 2001-07-19 Trennschalter mit Messerkontakt und Blockierungssystem durch Überschreitung eines toten Punktes

Country Status (2)

Country Link
EP (1) EP1174894A1 (de)
FR (1) FR2812124B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103644838A (zh) * 2013-11-06 2014-03-19 中联重科股份有限公司 回转角度测量机构、回转角度测量方法、装置及系统
CN106373811A (zh) * 2016-10-19 2017-02-01 国网冀北电力有限公司张家口供电公司 隔离开关触头调整装置
CN108320945A (zh) * 2018-04-09 2018-07-24 广东电网有限责任公司 一种零线相防误操作的低压隔离开关装置
CN108335942A (zh) * 2018-03-06 2018-07-27 浙江工贸职业技术学院 一种隔离开关

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1200583A (fr) * 1957-11-15 1959-12-22 Gardy Particip App Couteau de mise à terre

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1200583A (fr) * 1957-11-15 1959-12-22 Gardy Particip App Couteau de mise à terre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103644838A (zh) * 2013-11-06 2014-03-19 中联重科股份有限公司 回转角度测量机构、回转角度测量方法、装置及系统
CN106373811A (zh) * 2016-10-19 2017-02-01 国网冀北电力有限公司张家口供电公司 隔离开关触头调整装置
CN106373811B (zh) * 2016-10-19 2018-06-15 国网冀北电力有限公司张家口供电公司 隔离开关触头调整装置
CN108335942A (zh) * 2018-03-06 2018-07-27 浙江工贸职业技术学院 一种隔离开关
CN108320945A (zh) * 2018-04-09 2018-07-24 广东电网有限责任公司 一种零线相防误操作的低压隔离开关装置

Also Published As

Publication number Publication date
FR2812124A1 (fr) 2002-01-25
FR2812124B1 (fr) 2004-06-25

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