EP2319064A1 - Two-column electrical disconnector - Google Patents

Two-column electrical disconnector

Info

Publication number
EP2319064A1
EP2319064A1 EP09741455A EP09741455A EP2319064A1 EP 2319064 A1 EP2319064 A1 EP 2319064A1 EP 09741455 A EP09741455 A EP 09741455A EP 09741455 A EP09741455 A EP 09741455A EP 2319064 A1 EP2319064 A1 EP 2319064A1
Authority
EP
European Patent Office
Prior art keywords
contact
arms
disconnector
divarication
electrical
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.)
Granted
Application number
EP09741455A
Other languages
German (de)
French (fr)
Other versions
EP2319064B1 (en
Inventor
Dario Bergamo
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.)
GE Vernova GmbH
Original Assignee
Areva T&D Italy SpA
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 Areva T&D Italy SpA filed Critical Areva T&D Italy SpA
Publication of EP2319064A1 publication Critical patent/EP2319064A1/en
Application granted granted Critical
Publication of EP2319064B1 publication Critical patent/EP2319064B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01H31/30—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 actuated through the movement of one or more insulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting

Definitions

  • the present invention relates to a two-column electrical disconnector.
  • Such disconnectors have two posts, at the upper ends of which there are provided two arms that can rotate in a coordinated manner about the axis of the posts in order to connect at their free ends.
  • the one that has a contact head adapted to engage a contact seat provided at the free end of the other arm is generally referenced as a male arm.
  • the contact head Upon closure of the disconnector, the contact head engages the contact seat, so as to produce their electrical connection at electrical contacts with which they are provided.
  • the aim of the present invention is to provide a two-column electrical disconnector that meets these needs by ensuring, when it is closed, a safe electrical connection between its contacts.
  • an object of the invention is to propose a disconnector that makes it possible to obtain a stable electrical connection between its contacts.
  • Another object of the invention is to propose a disconnector that is structurally simple and easy to use and can be manufactured at low cost.
  • a two-column electrical disconnector comprising a female arm and a male arm, provided with a contact head that is adapted to enter a contact seat of said female arm, characterized in that said contact head has contact recesses with a substantially V-shaped profile which are open in order to receive, upon closure of said disconnector, contact pads of said female arm, with a two-point contact, said female arm comprising two half-arms that are arranged side by side so as to form between them, at a free end thereof, said contact seat, having thereat said contact pads, elastic means for contrasting the divarication of said half-arms being provided, said half-arms partially divaricating, in contrast with said elastic means, when said contact pads engage said contact recesses upon closure of said disconnector.
  • Figure 1 is a perspective view of a detail of a disconnector according to the invention in a partially open configuration
  • Figure 2 is a partially sectional enlarged-scale view of a detail of the disconnector according to the invention.
  • Figure 3 is a sectional view of the disconnector according to the invention, taken along the line III-III of Figure 2;
  • Figure 4 is a sectional view of the disconnector according to the invention, taken along the line IV-IV of Figure 2. Ways of carrying out the Invention
  • the reference numeral 10 generally designates a two-column electrical disconnector, which comprises a female arm 11 and a male arm 12, which is provided with a contact head 13 that is adapted to enter a contact seat 14 of the female arm 11.
  • a particularity of the disconnector 10 is that it comprises a contact head 13 that has contact recesses 15 which have a substantially open V-shaped profile in order to receive, upon closure of the disconnector, contact pads 16 of the female arm 11 , with a contact of the type on two points A and B.
  • the female arm 11 comprises two half-arms 17a and 17b, which are arranged side by side so as to form between them, at a free end thereof, the contact seat 14, having the contact pads 16 thereat.
  • elastic means 18 for contrasting the divarication of the half-arms 17a are 17b are provided, said arms partially divaricating, in contrast with the elastic means 18, when the contact pads 16 engage the contact recesses 15 to close the disconnector 10.
  • the disconnector 10 comprises means for divarication of the half-arms 17a and 17b upon insertion of the contact head 13 in the contact seat 14, which conveniently comprise:
  • the contact pads 16 and/or the contact elements 21 on which the contact recesses 15 are formed are made of copper.
  • the contact recesses 15 conveniently have a hollow 22 at their bottom 23 in order to contrast the abutment of the contact pads 16 against the bottom 23, when the disconnector 10 is closed.
  • the female arm 1 1 conveniently has means for spacing the half-arms 17a and 17b, to contrast their juxtaposition beyond a predefined distance, which in particular comprise advantageously two brackets 24a and 24b that protrude toward each other from the half-arms 17a and 17b, defining, upon their abutment, such minimum distance.
  • the elastic means 18 comprise a helical spring 25, which surrounds a stem 26 that protrudes from a first bracket 24a of the brackets 24a and 24b toward the second bracket 24b.
  • the ends 25a and 25b of the spring 25 abut against a shoulder 27 of the stem 26 provided at its free end, and against an abutment 28 formed on the second bracket 24b, to contrast the divarication of the brackets 24a and 24b.
  • the shoulder 27 is formed by a washer 29, which is retained by a bolt 30 screwed onto a threaded end 31 of the stem 27.
  • sealings 32 for electrical insulation of the stem 27 and of the spring 25 with respect to the brackets 24a and 24b.
  • the pins 20 abut against the ramps 19 ' and by pushing against them the half-arms 17a and 17b divaricate in contrast with the spring 25 compressed between the abutment 28 of the second bracket 24b and the shoulder 27 of the stem 26, which is jointly connected to the first bracket 24a.
  • the contact pads 16 abut against the contact elements 21, establishing with them an electrical contact in the contact recesses 15, substantially in two points A and B.
  • the contact pads 16 are pressed against the contact elements 21 in the contact recesses 15 by the spring 25.
  • the mutual distance of the contact pads 16 when they engage the contact recesses is such as to force a divarication of the half-arms 17a and 17b, compressing the spring 25 that opposes it, and thus presses the contact pads 16 against the contact elements 21, allowing effective and stable electrical contact between them.
  • the spring 25 is electrically insulated against at least one of the half-arms 17a and 17b, so as to avoid the flow of current through it.
  • the disconnector according to the invention achieves the intended aim and objects, allowing certain and stable electrical connection between its contacts, ensured by the mutual contact thrust produced by the spring.
  • the disconnector according to the invention is structurally simple and easy to use and can be manufactured at low cost.
  • the materials employed may be any according to requirements and to the state of the art.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Contacts (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Breakers (AREA)

Abstract

A two-column electrical disconnector (10), comprising a female arm (11) and a male arm (12), provided with a contact head (13) that is adapted to enter a contact seat (14) of the female arm (11). The contact head (13) has contact recesses (15) with a substantially V-shaped profile which are open in order to receive, upon closure of the disconnector (10), contact pads (16) of the female arm (11), with contact of the type on two points (A, B). The female arm (11) comprises two half-arms (17a, 17b) that are arranged side by side so as to form between them, at a free end thereof, the contact seat (14), having thereat the contact pads (16), elastic means (18) for contrasting the divarication of the half-arms (17a, 17b) being provided, said half-arms (17a, 17b) partially divaricating, in contrast with the elastic means (18), when the contact pads (16) engage the contact recesses (15) upon closure of the disconnector (10).

Description

TWO-COLUMN ELECTRICAL DISCONNECTOR
Technical field
The present invention relates to a two-column electrical disconnector. Background Art
Two-column disconnectors with rotating arms are currently known.
Such disconnectors have two posts, at the upper ends of which there are provided two arms that can rotate in a coordinated manner about the axis of the posts in order to connect at their free ends.
Of these arms, the one that has a contact head adapted to engage a contact seat provided at the free end of the other arm, known as a female arm, is generally referenced as a male arm.
Upon closure of the disconnector, the contact head engages the contact seat, so as to produce their electrical connection at electrical contacts with which they are provided.
The need to obtain an abutment of such contacts that is effective in order to achieve their electrical connection is particularly felt in the field of these devices.
The need to achieve a connection between such contacts that is stable over time is equally strong.
Particularly in the case of disconnectors for networks that operate at high electrical voltages, an uncertain and/or unstable contact induces electric arcs, to the full disadvantage of the safety and working life of the disconnector.
Disclosure of the Invention
The aim of the present invention is to provide a two-column electrical disconnector that meets these needs by ensuring, when it is closed, a safe electrical connection between its contacts.
Within this aim, an object of the invention is to propose a disconnector that makes it possible to obtain a stable electrical connection between its contacts.
Another object of the invention is to propose a disconnector that is structurally simple and easy to use and can be manufactured at low cost.
This aim, as well as these and other objects that will become better apparent hereinafter, are achieved by a two-column electrical disconnector, comprising a female arm and a male arm, provided with a contact head that is adapted to enter a contact seat of said female arm, characterized in that said contact head has contact recesses with a substantially V-shaped profile which are open in order to receive, upon closure of said disconnector, contact pads of said female arm, with a two-point contact, said female arm comprising two half-arms that are arranged side by side so as to form between them, at a free end thereof, said contact seat, having thereat said contact pads, elastic means for contrasting the divarication of said half-arms being provided, said half-arms partially divaricating, in contrast with said elastic means, when said contact pads engage said contact recesses upon closure of said disconnector.
Brief description of the drawings
Further characteristics and advantages of the invention will become better apparent from the following detailed description of a preferred but not exclusive embodiment of the disconnector according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
Figure 1 is a perspective view of a detail of a disconnector according to the invention in a partially open configuration;
Figure 2 is a partially sectional enlarged-scale view of a detail of the disconnector according to the invention;
Figure 3 is a sectional view of the disconnector according to the invention, taken along the line III-III of Figure 2;
Figure 4 is a sectional view of the disconnector according to the invention, taken along the line IV-IV of Figure 2. Ways of carrying out the Invention
It is noted that anything found to be already known during the patenting process is understood not to be claimed and to be the subject of a disclaimer.
With reference to the figures, the reference numeral 10 generally designates a two-column electrical disconnector, which comprises a female arm 11 and a male arm 12, which is provided with a contact head 13 that is adapted to enter a contact seat 14 of the female arm 11.
According to the invention, a particularity of the disconnector 10 is that it comprises a contact head 13 that has contact recesses 15 which have a substantially open V-shaped profile in order to receive, upon closure of the disconnector, contact pads 16 of the female arm 11 , with a contact of the type on two points A and B.
The female arm 11 comprises two half-arms 17a and 17b, which are arranged side by side so as to form between them, at a free end thereof, the contact seat 14, having the contact pads 16 thereat.
Moreover, elastic means 18 for contrasting the divarication of the half-arms 17a are 17b are provided, said arms partially divaricating, in contrast with the elastic means 18, when the contact pads 16 engage the contact recesses 15 to close the disconnector 10.
Advantageously, the disconnector 10 comprises means for divarication of the half-arms 17a and 17b upon insertion of the contact head 13 in the contact seat 14, which conveniently comprise:
- ramps 19 for divarication of the half-arms 17a and 17b provided thereon in mirror- symmetrical positions at the contact seat 14,
- pins 20 for pushing the ramps 19, which are provided at the contact head 13 and are adapted to push the ramps 19 for divarication of the half- arms 17a and 17b during the closure of the disconnector 10.
Preferably, the contact pads 16 and/or the contact elements 21 on which the contact recesses 15 are formed are made of copper. Moreover, the contact recesses 15 conveniently have a hollow 22 at their bottom 23 in order to contrast the abutment of the contact pads 16 against the bottom 23, when the disconnector 10 is closed.
This is done to achieve such contact of the type on two points A and B of the contact pads 16 in the contact recesses 15.
The female arm 1 1 conveniently has means for spacing the half-arms 17a and 17b, to contrast their juxtaposition beyond a predefined distance, which in particular comprise advantageously two brackets 24a and 24b that protrude toward each other from the half-arms 17a and 17b, defining, upon their abutment, such minimum distance.
Preferably, the elastic means 18 comprise a helical spring 25, which surrounds a stem 26 that protrudes from a first bracket 24a of the brackets 24a and 24b toward the second bracket 24b.
The ends 25a and 25b of the spring 25 abut against a shoulder 27 of the stem 26 provided at its free end, and against an abutment 28 formed on the second bracket 24b, to contrast the divarication of the brackets 24a and 24b.
Conveniently, the shoulder 27 is formed by a washer 29, which is retained by a bolt 30 screwed onto a threaded end 31 of the stem 27.
In addition, preferably there are provided sealings 32 for electrical insulation of the stem 27 and of the spring 25 with respect to the brackets 24a and 24b.
Operation of the disconnector according to the invention is as follows.
Upon closure of the disconnector 10, the female arm 11 and the male arm 12 rotate, and the contact head 13, by aligning itself, engages the contact seat 14.
More specifically, during such engagement, the pins 20 abut against the ramps 19' and by pushing against them the half-arms 17a and 17b divaricate in contrast with the spring 25 compressed between the abutment 28 of the second bracket 24b and the shoulder 27 of the stem 26, which is jointly connected to the first bracket 24a.
Substantially simultaneously, the contact pads 16 abut against the contact elements 21, establishing with them an electrical contact in the contact recesses 15, substantially in two points A and B.
When closure of the disconnector 10 is completed, the male arm 12 and the female arm 11 are aligned.
In this configuration, the contact pads 16 are pressed against the contact elements 21 in the contact recesses 15 by the spring 25.
The mutual distance of the contact pads 16 when they engage the contact recesses is such as to force a divarication of the half-arms 17a and 17b, compressing the spring 25 that opposes it, and thus presses the contact pads 16 against the contact elements 21, allowing effective and stable electrical contact between them.
Moreover, the spring 25 is electrically insulated against at least one of the half-arms 17a and 17b, so as to avoid the flow of current through it.
In practice it has been found that the disconnector according to the invention achieves the intended aim and objects, allowing certain and stable electrical connection between its contacts, ensured by the mutual contact thrust produced by the spring.
Further, the disconnector according to the invention is structurally simple and easy to use and can be manufactured at low cost.
The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements.
In practice, the materials employed, as long as they are compatible with the specific use, as well as the contingent shapes and dimensions, may be any according to requirements and to the state of the art.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. A two-column electrical disconnector (10), comprising a female arm (11) and a male arm (12), provided with a contact head (13) that is adapted to enter a contact seat (14) of said female arm (11), characterized in that said contact head (13) has contact recesses (15) with a substantially V- shaped profile which are open in order to receive, upon closure of said disconnector (10), contact pads (16) of said female arm (11), with contact of the type on two points (A, B), said female arm (11) comprising two half- arms (17a, 17b) that are arranged side by side so as to form between them, at a free end thereof, said contact seat (14), having thereat said contact pads (16), elastic means (18) for contrasting the divarication of said half-arms (17a, 17b) being provided, said half-arms (17a, 17b) being partially divaricated, in contrast with said elastic means (18), when said contact pads (16) engage said contact recesses (15) upon closure of said disconnector (10).
2. The electrical disconnector according to claim 1, characterized in that it comprises means for divarication of said half-arms (17a, 17b) upon insertion of said contact head (13) in said contact seat (14).
3. The electrical disconnector according to claim 2, characterized in that said divarication means comprise
- ramps (19) for divarication of said half-arms (17a, 17b) provided on them in mirror-symmetrical positions at said contact seat (14),
- pins (20) for pushing said ramps (19), which are provided at said contact head (13) and are adapted to push said ramps (19) so as to make said half-arms (17a, 17b) divaricate during the closure of said disconnector (10).
4. The electrical disconnector according to one or more of the preceding claims, characterized in that said contact pads (16) are made of copper.
5. The electrical disconnector according to one or more of the preceding claims, characterized in that said contact recesses (15) are formed on contact elements made of copper.
6. The electrical disconnector according to one or more of the preceding claims, characterized in that said contact recesses (15) have a hollow (22) at their bottom (23), to contrast the abutment of said contact pads (16) against said bottom (23) when said disconnector (10) is closed.
7. The electrical disconnector according to one or more of the preceding claims, characterized in that said female arm (11) has means for spacing said half-arms (17a, 17b) to contrast their juxtaposition beyond a predefined distance.
8. The electrical disconnector according to one or more of the preceding claims, characterized in that said spacing means comprise two brackets (24a, 24b), which protrude toward each other from said half-arms (17a, 17b), defining said minimum distance upon their abutment.
9. The electrical disconnector according to one or more of the preceding claims, characterized in that said elastic means (18) comprise a helical spring (25), which surrounds a stem (26) that protrudes from a first one of said brackets (24a, 24b) toward the second one of said brackets (24a, 24b), the ends of said spring (25) abutting, in an electrically insulated manner, against a shoulder (27) of said stem (26) that is provided at its free end, and against an abutment (28) that is formed on said second bracket (24b), to contrast the divarication of said brackets (24a, 24b).
EP09741455.1A 2009-08-13 2009-08-13 Two-column electrical disconnector Active EP2319064B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2009/000385 WO2011018810A1 (en) 2009-08-13 2009-08-13 Two-column electrical disconnector

Publications (2)

Publication Number Publication Date
EP2319064A1 true EP2319064A1 (en) 2011-05-11
EP2319064B1 EP2319064B1 (en) 2013-06-05

Family

ID=42076982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09741455.1A Active EP2319064B1 (en) 2009-08-13 2009-08-13 Two-column electrical disconnector

Country Status (3)

Country Link
EP (1) EP2319064B1 (en)
CN (1) CN102089844B (en)
WO (1) WO2011018810A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016214380B4 (en) * 2016-08-03 2018-10-25 Siemens Aktiengesellschaft Contact arm for a high voltage switchgear and method of using it

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1222137B (en) * 1965-01-15 1966-08-04 Sachsenwerk Licht & Kraft Ag Disconnector or earthing switch with double cutting blades
BE823748A (en) * 1974-12-23 1975-06-23 Acec FIXED CONTACT AND MOBILE CONTACT ASSEMBLY FOR ELECTRICAL TRANSFORMER TAKING CHANGER.
EP0203373A1 (en) * 1985-05-20 1986-12-03 BBC Brown Boveri AG Isolating switch

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011018810A1 *

Also Published As

Publication number Publication date
EP2319064B1 (en) 2013-06-05
WO2011018810A1 (en) 2011-02-17
CN102089844B (en) 2014-12-17
CN102089844A (en) 2011-06-08
WO2011018810A8 (en) 2011-10-06

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