EP4521439B1 - Erdungsvorrichtung für elektrische hochspannungsschaltgeräte - Google Patents

Erdungsvorrichtung für elektrische hochspannungsschaltgeräte

Info

Publication number
EP4521439B1
EP4521439B1 EP23724895.0A EP23724895A EP4521439B1 EP 4521439 B1 EP4521439 B1 EP 4521439B1 EP 23724895 A EP23724895 A EP 23724895A EP 4521439 B1 EP4521439 B1 EP 4521439B1
Authority
EP
European Patent Office
Prior art keywords
casing
grounding
protection element
electrical
operating means
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.)
Active
Application number
EP23724895.0A
Other languages
English (en)
French (fr)
Other versions
EP4521439C0 (de
EP4521439A1 (de
Inventor
Luis RANEDO TORRES
Sergio Sebastian Martin
Joseba Arostegui Legarreta-Echevarria
Juan Antonio Sanchez Ruiz
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.)
Ormazabal y Cia SL
Original Assignee
Ormazabal y Cia SL
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 Ormazabal y Cia SL filed Critical Ormazabal y Cia SL
Publication of EP4521439A1 publication Critical patent/EP4521439A1/de
Application granted granted Critical
Publication of EP4521439C0 publication Critical patent/EP4521439C0/de
Publication of EP4521439B1 publication Critical patent/EP4521439B1/de
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
    • H01H31/003—Earthing switches
    • 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
    • H01H31/02—Details
    • H01H31/12—Adaptation for built-in fuse
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H85/202—Bases for supporting the fuse; Separate parts thereof for fuses with ferrule type end contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H85/205—Electric connections to contacts on the base
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/48—Protective devices wherein the fuse is carried or held directly by the base
    • H01H85/50—Protective devices wherein the fuse is carried or held directly by the base the fuse having contacts at opposite ends for co-operation with the base

Definitions

  • the field of application of the present invention is electrical power distribution systems, in particular, it relates to an automatic grounding device for high voltage electrical switchgear, which is built into an enclosure that comprises in turn, a series of elements, among others, at least one operating means that allows to carry out the functions of breaking/making, disconnecting and grounding of the electrical circuit, as well as at least one protection element against overloads and short circuits built into a casing.
  • the purpose of the device of the invention is to connect to ground both the upstream side of the casing that incorporates the protection element and the downstream side of said casing during the operation for removing the protection element from the casing and while the operating means is in the grounding position.
  • the high-voltage electrical switchgear used in electricity distribution networks is installed in usually metallic enclosures, called cells.
  • Said electrical switchgear includes operating means, such as switches, which perform the functions of breaking/making, disconnecting and grounding of the system.
  • operating means such as switches, which perform the functions of breaking/making, disconnecting and grounding of the system.
  • an enclosure that incorporates the electrical switchgear can comprise at least one operating means, such as a load break switch that performs the functions of breaking/making, disconnecting and grounding, and at least one protection element such as a fuse.
  • the protection element is installed inside a casing or also known as a fuse-holder tube, housed in a removable fuse holder base.
  • the operating means is installed between at least one main circuit bar and the casing that incorporates the protection element, while said casing of the protection element is installed between the operating means and at least one shunt bar.
  • Switches that include a pair of fixed contacts and a mobile contact that can be electrically connected to said fixed contacts can sometimes also include a third fixed grounding contact, so that in this case the switch would have three operating positions (breaking/making, disconnecting and grounding).
  • the electrical switchgear comprising this type of switch with three operating positions and a series fuse installed downstream of the switch, as shown in figure 1 , when the switch is in the grounding operating position, both ends of the casing that incorporates the fuse are connected to ground, that is, the electrical circuit both upstream and downstream of the fuse is connected to ground, so the operator can safely access that section of the electrical circuit that is grounded on both sides, for example to carry out the work of replacing the fuse when the latter has blown due to an electrical fault.
  • figure 1 shows a switch (2) with three operating positions (breaking/making, disconnecting and grounding) incorporated in an enclosure (1), where the switch (2) is in the grounding position, thus connecting to ground the electrical circuit both upstream (11) and downstream (12) of the fuse (3).
  • a switch (2) with three operating positions (breaking/making, disconnecting and grounding) can be seen incorporated in an enclosure (1), wherein the switch (2) is located in the grounding position, thus connecting the upstream part (11) of the fuse (3) to ground, while in order to connect the downstream part (12) of the fuse (3) to ground, it is necessary to add a grounding switch (14).
  • rotary operating means that is, rotary switches that comprise a pair of fixed contacts arranged diametrically opposite each other and a mobile contact with rotary movement that can electrically connect the pair of fixed contacts to each other, can also comprise a third grounding operating position, for which they include a third fixed contact that is connected to ground.
  • the main advantage of this type of switch is that a point other than the one connected in service can be grounded, in this case grounding the downstream part of the fuse, which is a point susceptible to being energized, and at the same time the most accessible point of the fuse housing.
  • the electrical switchgear that includes a rotary switch with three operating positions (breaking/making, disconnecting and grounding) and a series fuse installed downstream said switch, as shown in figure 3
  • both sides of the fuse are connected to ground (both sides of the housing that incorporates the fuse)
  • the switch is brought to the grounding position and one end of the casing that incorporates the fuse is connected to ground, but not the other end, that is, only the side of the electrical circuit that is downstream the blown fuse is connected to ground, but not the side of the electrical circuit that is upstream the blown fuse.
  • the section of electrical circuit between the switch and the blown fuse remains floating, at an indeterminate potential as there is no continuity in the fuse because it is blown. In the event that it is possible to access that floating section of the electrical circuit, and that it had also been charged with voltage, it could be a risk of electrical contact for the operators.
  • Figure 3 shows a rotary type switch (2) that is in the grounding position, thus connecting to ground the side of the electrical circuit that is downstream (12) the fuse (3), but not the side of the electrical circuit that is upstream (11) the fuse (3).
  • document EP0771057 discloses a grounding device for a high-voltage electrical switchgear equipped with an enclosure that includes at least one operating means inside it with functions of breaking/ making, disconnecting and grounding, as well as at least one protection element, the protection element being incorporated inside a casing that includes two electrical connection points and that is arranged between the operating means at the top and at least one shunt bar at the bottom.
  • the invention disclosed in this application differs from EP0771057 in that the grounding device comprises at least one elastic element and a movable contact between the first connection point and the second connection point, so that the elastic element decompresses and pushes the contact in an operation for removing the protection element from the casing, while in an operation for inserting the protection element in the casing, the elastic element is compressed and the contact moves back towards the first connection point.
  • the present invention refers to a grounding device for application in electrical power distribution systems such as, for example, electrical transformation centers, distribution centers, substations, etc., specifically applied in electrical switchgear that is installed in enclosures or cells, wherein the electrical switchgear includes at least one operating means inside the enclosure, such as a rotary threeposition load break switch (breaking/making, disconnecting and grounding) and at least one element for protection against overloads and short circuits, such as a fuse incorporated in a fuse-holder casing or tube, the operating means and the protection element being installed in series between at least one main circuit bar and at least one shunt bar.
  • the electrical switchgear includes at least one operating means inside the enclosure, such as a rotary threeposition load break switch (breaking/making, disconnecting and grounding) and at least one element for protection against overloads and short circuits, such as a fuse incorporated in a fuse-holder casing or tube, the operating means and the protection element being installed in series between at least one main circuit bar and at least one shunt bar.
  • the grounding device of the invention solves each and every one of the problems mentioned above, and therefore, the device allows grounding downstream as well as upstream the fuse, it even allows grounding the electrical circuit section between the switch and the housing that incorporates the fuse when the fuse is removed from said housing.
  • the point of the downstream fuse is connected to ground, which in turn is the point of the fuse casing closest to the operator and, at the same time, the output of the electrical switchgear, this being the point from where the voltage can come from.
  • the grounding device automatically connects to ground the other point of the fuse casing furthest away from the operator, so that any operator can access both the upstream and downstream sides of the casing safely without being exposed to electrical risks.
  • the grounding device is installed inside the casing of the protection element and this casing comprises at least one electrical connection point that is arranged between the operating means and the shunt bar of the electrical circuit.
  • the grounding device comprises at least one elastic element, such as a spring made of conductive material, and an electrically conductive contact, wherein the elastic element is connected at one of its ends to the first electrical connection point, in such a way that the contact of the grounding device can move between the first connection point and the second connection point of the casing that incorporates the protection element.
  • the elastic element decompresses and pushes the contact of the grounding device towards the second electrical connection point of the casing, so that once the contact of the grounding device comes to a stop with said second electrical connection point, the section of electrical circuit between the operating means and the casing that incorporates the protection element is automatically connected to ground, that is, the side of the electrical circuit upstream the casing of the protection element is grounded.
  • the side of the electrical circuit downstream the protection element casing is grounded at the moment when the operating means is in the grounding position.
  • the grounding device (8) of the present invention is applied to an electrical switchgear that is installed in an enclosure (1), wherein the electrical switchgear includes at least one operating means (2) inside the enclosure (1), such as a rotary load break switch with three positions (breaking/making, disconnecting and grounding) and at least one protection element (3) against overloads and short circuits, such as a fuse incorporated in a casing (4), with the operating means (2) and the protection element (3) installed in series between at least one main circuit bar (13) and at least one shunt bar (7), as shown in figure 8 .
  • the electrical switchgear includes at least one operating means (2) inside the enclosure (1), such as a rotary load break switch with three positions (breaking/making, disconnecting and grounding) and at least one protection element (3) against overloads and short circuits, such as a fuse incorporated in a casing (4), with the operating means (2) and the protection element (3) installed in series between at least one main circuit bar (13) and at least one shunt bar (7), as shown in figure 8 .
  • the grounding device (8) comprises at least one elastic element (9), such as a spring, made of conductive material and a contact (10) also made of conductive material.
  • the grounding device (8) is installed inside the casing (4) of the protection element (3), as can be seen in figures 5 to 8 , and said casing (4) comprises at least one electrical connection point (5, 6) that is arranged between the operating means (2) and the shunt bar (7) of the electrical circuit.
  • the elastic element (9) of the grounding device (8) is joined at one of its ends to the first electrical connection point (5), as shown in figures 5 to 7 , in such a way that the contact (10) of the grounding device (8) is movable between the first connection point (5) and the second connection point (6) of the casing (4) that incorporates the protection element (3).
  • the elastic element (9) decompresses and pushes the contact (10) of the grounding device (8) towards the second electrical connection point (6) of the casing (4), as shown in figure 5 , so that once the contact (10) of the grounding device (8) abuts said second electrical connection point (6), the section of electrical circuit between the operating means (2) and the casing (4) that incorporates the protection element (3) is automatically connected to ground, as shown in figure 6 wherein the protection element (3) has already been fully removed, that is, the side (11) of the electrical circuit upstream the casing (4) of the protection element (3) is grounded.
  • the side (12) of the electrical circuit downstream the casing (4) of the protection element (3) is grounded at the moment that the operating means (2) is in the grounding position.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Patch Boards (AREA)

Claims (4)

  1. Elektrische Hochspannungsschaltanlage, umfassend eine Elnhausung (1), die mindestens ein Betriebsmittel (2) mit Funktionen zum Unterbrechen/Herstellen, Trennen und Erden sowie mindestens ein Schutzelement (3) enthält, wobei das Schutzelement (3) in einem Gehäuse (4) aufgenommen ist, das zwei elektrische Verbindungspunkte (5, 6) enthält und das zwischen dem Betriebsmittel (2) und mindestens einer Sammelschiene (7) angeordnet ist, wobei die elektrische Schaltanlage ferner eine Erdungsvorrichtung (8) umfasst;
    wobei die elektrische Schaltanlage dadurch gekennzeichnet ist, dass die Erdungsvorrichtung (8) mindestens ein elastisches Element (9) und einen beweglichen Kontakt (10) zwischen dem ersten Verbindungspunkt (5) und dem zweiten Verbindungspunkt (6) umfasst, so dass das elastische Element (9) bei einem Vorgang zum Entfernen des Schutzelements (3) aus dem Gehäuse (4) dekomprimiert und den Kontakt (10) schiebt, während bei einem Vorgang zum Einsetzen des Schutzelements (3) in das Gehäuse (4) das elastische Element (9) komprimiert wird und sich der Kontakt (10) in Richtung des ersten Verbindungspunkts (5) zurückbewegt.
  2. Elektrische Hochspannungsschaltanlage nach Anspruch 1, wobei das elastische Element (9) aus einem leitenden Material hergestellt ist.
  3. Elektrische Hochspannungsschaltanlage nach Anspruch 2, wobei das elastische Element (9) ein Ende, das mit dem ersten elektrischen Verbindungspunkt (5) verbunden ist, und das andere Ende, das mit dem elektrisch leitenden Kontakt (10) verbunden ist, umfasst.
  4. Elektrische Hochspannungsschaltanlage nach Anspruch 3, wobei der erste elektrische Verbindungspunkt (5) mit dem Betriebsmittel (2) verbunden ist und der zweite elektrische Verbindungspunkt (6) mit der Sammelschiene (7) verbunden ist, so dass in der Erdungsposition des Betriebsmittels (2) das Entfernen des Schutzelements (3) aus dem Gehäuse (4) die Erdung einer Seite (11) stromaufwärts des Gehäuses (4) sowie einer Seite (12) stromabwärts des Gehäuses (4) voraussetzt.
EP23724895.0A 2022-05-03 2023-04-20 Erdungsvorrichtung für elektrische hochspannungsschaltgeräte Active EP4521439B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES202230730U ES1290739Y (es) 2022-05-03 2022-05-03 Dispositivo de puesta a tierra para aparamenta eléctrica de alta tensión
PCT/ES2023/070250 WO2023214102A1 (es) 2022-05-03 2023-04-20 Dispositivo de puesta a tierra para aparamenta eléctrica de alta tensión

Publications (3)

Publication Number Publication Date
EP4521439A1 EP4521439A1 (de) 2025-03-12
EP4521439C0 EP4521439C0 (de) 2026-02-11
EP4521439B1 true EP4521439B1 (de) 2026-02-11

Family

ID=81593682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23724895.0A Active EP4521439B1 (de) 2022-05-03 2023-04-20 Erdungsvorrichtung für elektrische hochspannungsschaltgeräte

Country Status (6)

Country Link
EP (1) EP4521439B1 (de)
AR (1) AR129110A1 (de)
CO (1) CO2024015089A2 (de)
ES (1) ES1290739Y (de)
MX (1) MX2024013499A (de)
WO (1) WO2023214102A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2259459A1 (en) * 1974-01-24 1975-08-22 Distrelec Sarl Single enclosure high voltage switching set - has insulating male connectors for cables and removable connections
FR2589640B1 (fr) * 1985-10-30 1987-12-11 Alsthom Poste a hexafluorure de soufre pour commutation en charge
FR2740621B1 (fr) * 1995-10-26 1997-11-21 Gec Alsthom T & D Sa Poste blinde a moyenne tension

Also Published As

Publication number Publication date
MX2024013499A (es) 2024-12-06
EP4521439C0 (de) 2026-02-11
ES1290739U (es) 2022-05-18
EP4521439A1 (de) 2025-03-12
AR129110A1 (es) 2024-07-17
ES1290739Y (es) 2022-08-22
CO2024015089A2 (es) 2025-01-23
WO2023214102A1 (es) 2023-11-09

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