EP3716305B1 - Schutzschalter - Google Patents

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Publication number
EP3716305B1
EP3716305B1 EP20166458.8A EP20166458A EP3716305B1 EP 3716305 B1 EP3716305 B1 EP 3716305B1 EP 20166458 A EP20166458 A EP 20166458A EP 3716305 B1 EP3716305 B1 EP 3716305B1
Authority
EP
European Patent Office
Prior art keywords
section
circuit breaker
shaft
insulating layer
insulating
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
EP20166458.8A
Other languages
English (en)
French (fr)
Other versions
EP3716305A1 (de
Inventor
Zhigang Han
Yi Liu
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP3716305A1 publication Critical patent/EP3716305A1/de
Application granted granted Critical
Publication of EP3716305B1 publication Critical patent/EP3716305B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1009—Interconnected mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/48—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1009—Interconnected mechanisms
    • H01H71/1027—Interconnected mechanisms comprising a bidirectional connecting member actuated by the opening movement of one pole to trip a neighbour pole
    • 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
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H2050/028—Means to improve the overall withstanding voltage, e.g. creepage distances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1009—Interconnected mechanisms
    • H01H2071/1036—Interconnected mechanisms having provisions for four or more poles

Definitions

  • Embodiments of the present disclosure generally relate to an electrical device and more particularly to a circuit breaker with a shaft being insulated according to the preamble of claim 1 (see DE 25 07 454 B1 ).
  • a circuit breaker refers to an electrical device capable of turning on, carrying, and turning off the current under a normal circuit condition, and capable of turning on, carrying for a period of time and automatically turning off the current under a specified abnormal circuit condition (such as a short-circuit current).
  • Circuit breakers are widely used in various electricity scenarios in production and daily life, and are an important guarantee for safe electricity use.
  • the shaft made of a metal in the circuit breaker is prone to breakdown during a short circuit under a high-voltage environment, causing an inter-phase short circuit as well as extremely large hidden safety risks.
  • CN 208077912 U discloses a circuit breaker.
  • one or two shafts made of a metal are usually used to run through the contact support of each phase in order to ensure the synchronization of acts of the contacts and modularized assembling.
  • the metal shafts are prone to breakdown upon a short circuit, causing an inter-phase short circuit, and such inter-phase short circuit is particularly likely to occur under an AC/DC high-voltage environment. The inter-phase short circuit will cause serious harms to the circuit breaker itself and the circuit protected by the circuit breaker.
  • embodiments of the present disclosure provide a circuit breaker that uses a shaft with an insulating layer, which can implement effective insulation protection without changing the overall structure of the circuit breaker, and reduce the risks of occurrence of the inter-phase short circuit.
  • a circuit breaker comprises: a shaft including a first section and a second section; a movable contact assembly arranged on the shaft along an extending direction of the shaft and including a movable contact; and a driving mechanism coupled to the first section and adapted to drive the movable contact assembly to rotate with the shaft such that the movable contact contacts with or disengages from a stationary contact of the circuit breaker, wherein the shaft further comprises an insulating layer disposed on the first section and the second section.
  • the effective insulation protection for the shaft is achieved by the insulating layer disposed on the first section and second section, thereby avoiding the breakdown of the shaft upon the short circuit and reducing the risk of the inter-phase short circuit. Therefore, such a circuit breaker can be applied more widely and is more suitable for usage under a high-voltage environment.
  • the first section and the second section are made of a metal, and the diameter of the first section is larger than that of the second section.
  • the shaft main body is made of a metal, which ensures the easy machining and mechanical performance of the shaft itself. Meanwhile, the body of the shaft is made in a stepped shape by setting the diameter of the second section smaller than that of the first section. Accordingly, a thicker insulating layer may be disposed on the second section to further improve the insulation protection for the shaft.
  • the insulating layer comprises a first insulating coating disposed on the first section.
  • the insulation protection can be further enhanced without reducing the mechanical performance of the shaft.
  • a wear-resistant insulating coating may be selected to improve the wear resistance of the shaft and to reduce the loss of overrun.
  • the insulating layer further comprises an insulating sleeve disposed on the second section.
  • the insulating sleeve may be mounted onto the second section after the first section of the shaft is coupled to the driving mechanism. In this way, the difficulty of installation is reduced, and meanwhile the insulating sleeve is prevented from being worn when passing through the driving mechanism.
  • the insulating layer further comprises a second insulating coating and an insulating sleeve disposed on the second section.
  • the second insulating coating on the second section may be formed together with the first insulating layer on the first section, and the insulating sleeve can be conveniently installed on the second section. In this way, the insulation protection for the shaft is further improved without increasing the difficulty in installation and manufacture.
  • a thickness of the insulating sleeve is in a range of 0.1 mm to 0.3 mm. In such embodiments, the effective insulation protection is achieved using a thinner insulating sleeve without reducing the strong and tough mechanical performance of the shaft.
  • the insulating layer disposed on the second section is formed by an injection molding process.
  • the insulating layer integral with the second section may be formed by using the injection molding process, thereby resulting in uniform and reliable insulation protection.
  • the shaft has the same diameter at the first section and the second section. In such embodiments, the synchronization and consistency of acts of the movable contacts of different poles of the circuit breaker may be guaranteed by configuring the shaft to have a uniform diameter at different sections.
  • the first section is located at a middle portion of the shaft, and the second section comprises portions adjacent to both ends of the shaft.
  • the insulation protection may be achieved for a circuit breaker having more than two poles.
  • the circuit breaker is a four-pole circuit breaker. In such embodiments, a widely useful four-pole circuit breaker with good shaft insulation may be formed.
  • the circuit breaker is a three-pole circuit breaker. In such embodiments, a widely useful three-pole circuit breaker with good shaft insulation may be formed.
  • the shaft made of a metal in the circuit breaker is prone to breakdown upon a short circuit, causing an inter-phase short circuit, particularly under a high-voltage (> AC 690V) or DC (> DC 1000V) environment.
  • a high-voltage > AC 690V
  • DC > DC 1000V
  • the current flows through the poles of the circuit breaker sequentially.
  • the inter-phase short circuit is caused.
  • the path of the current is greatly reduced, and even damages are caused to the circuit breaker. Therefore, the inter-phase short circuit causes extreme harms.
  • the shaft of the circuit breaker is formed as a complete plastic shaft, or the shaft is formed by the docking or mating a metal segment with a plastic member.
  • the insulation of the shaft is improved, the difficulty in manufacturing the shaft is increased and the mechanical performance is reduced.
  • Embodiments of the present disclosure provide a circuit breaker including a shaft with an insulating layer so as to solve or at least partially solve the above and other potential problems.
  • FIG. 1 illustrates an overall schematic diagram of the circuit breaker 100 according to an exemplary embodiment of the present disclosure
  • FIG. 2 illustrates a partial cross-sectional view of the circuit breaker 100 shown in FIG. 1
  • FIG. 3 illustrates a schematic diagram of the internal structure 300 of the circuit breaker shown in FIG. 1 .
  • the circuit breaker 100 described herein is a four-pole circuit breaker including poles 111-114, wherein each pole is adapted to be connected to a phase line or a zero line.
  • the circuit breaker 100 further includes a driving mechanism 105.
  • the driving mechanism 105 may include a handle, an operation mechanism, a linkage mechanism, etc. The scope of the present disclosure is not limited to a specific driving mechanism, so it is not described in detail here.
  • the driving mechanism 105 is located at one pole of the circuit breaker, for example, at the pole 112.
  • the pole 112 may also be referred to as a mechanism pole 112.
  • Components such as shafts 310, movable contacts 302 and stationary contacts 304 are located within a housing 103 of the circuit breaker 100.
  • the circuit breaker 100 includes two shafts 310, and the shaft 310 includes a first section 311 and a second section 312, wherein the first section 311 is located at the mechanism pole 112.
  • Each of the poles 111-114 of the circuit breaker 110 includes a contact circuit composed of the stationary contact 304, the movable contact 302, a contact support 303, and so on.
  • a movable contact assembly including the movable contact 302 and the contact support 303 is arranged on the shaft 310 along an extending direction of the shaft 310.
  • the driving mechanism 105 is coupled to the first section 311 of the shaft 310 and is adapted to drive the movable contact assembly to rotate with the shaft 310 such that the movable contact 302 contacts with or disengages from the stationary contact 304 of the circuit breaker 100.
  • a linkage 305 constituting a part of the driving mechanism 105 is shown.
  • the linkage 305 is coupled to the first section 311. When the linkage 305 is pushed down or pulled up, the shaft 310 will cause the movable contacts 310 of individual poles to simultaneously contact with or disengage from the corresponding stationary contact 304 so as to close or open the corresponding contact circuit.
  • circuit breaker 100 as a four-pole circuit breaker is merely exemplary and is not intended to limit the scope of the present disclosure.
  • the embodiments of the present disclosure may be applied to various circuit breakers, such as a two-pole circuit breaker, a three-pole circuit breaker, and the like.
  • the driving mechanism may be coupled to any pole of the circuit breaker.
  • the circuit breaker 100 is shown as having two shafts in FIG. 1 to FIG. 3 for illustrative purposes only, but it should be understood that the circuit breaker according to embodiments of the present disclosure may have a larger or smaller number of shafts.
  • the shaft 310 further includes an insulating layer disposed on the first section 311 and the second section 312.
  • the insulating layer of the shaft 310 may be formed in any suitable manner, including but not limited to an insulating coating, an insulating sleeve, injection molding, and the like.
  • the insulating layers on the first section 311 and the second section 312 may be formed in the same or different manners, and may have the same or different thicknesses.
  • FIG. 4 illustrates a schematic diagram of forming the circuit breaker shaft 310 according to an exemplary embodiment of the present disclosure.
  • FIG. 5 illustrates a schematic diagram of a circuit breaker shaft 310 according to an exemplary embodiment of the present disclosure.
  • the shaft 310 includes a stepped shaft body made of for example a metal, which includes a first section 311 and a second section 312.
  • the diameter d1 of the first section 311 is larger than the diameter d2 of the second section 312.
  • the shaft body made of metal is easy to process and helps to ensure a strong and tough mechanical performance of the shaft.
  • the length L1 of the first section 311 as well as the lengths L2 and L3 of the second section 312 may be set according to actual needs.
  • a first insulating coating 401 is disposed on the first section 311.
  • the first insulating coating 401 may be formed in any suitable manner such as coating, spraying, or the like. Since the driving mechanism 105 is coupled to the shaft 310 at the first section 311, a component such as the linkage 305 will cause wear to the first insulating coating 401. Therefore, in some embodiments, the first insulating coating 401 may be formed as a wear-resistant insulating coating, for example, the first insulating coating 401 may be formed as an oxide (such as alumina) coating. In this way, not only the insulation protection of the shaft 310 is enhanced, but also the wear resistance of the shaft 310 is improved, thereby avoiding the loss of overrun.
  • the insulating layer disposed on the second section 312 may be formed using an insulating sleeve 402 such as a thermoplastic sleeve.
  • an insulating sleeve 402 such as a thermoplastic sleeve.
  • the insulating sleeve 402 may be directly sleeved onto the second section 312. This reduces the difficulty of installation and prevents the thermoplastic sleeve from being worn as it passes through the mechanism.
  • the thickness of the insulating sleeve 402 may be selected as needed. An excellent insulating effect may be achieved with a thin thermoplastic sleeve.
  • the thickness of the insulating sleeve 402 may be in a range of 0.1 mm to 0.3 mm.
  • a thermoplastic sleeve with a thickness of 0.15mm can effectively prevent the inter-phase short circuit of the shaft, and increase the creepage distance of the opposed phase. After the test, the breakdown does not occur between dielectric phases under a 3000 Vdc voltage condition for 5 seconds.
  • the insulating layer disposed on the second section 312 may include a second insulating coating, for example, formed together with the first insulating coating 401, and the second insulating coating may have the same thickness as or a different thickness from the first insulating coating 401.
  • the insulating sleeve 402 may further be disposed on the second insulating coating, which may further improve the insulation protection of the shaft 310.
  • the insulating layer disposed on the first section 311 or the second section 312 may also be formed by an injection molding process.
  • the shaft body including the first section 311 and the second section 312 may be placed in a mold, and then the insulating layer on the first section 311 and the second section 312 may be formed by injection molding.
  • both ends of the shaft 310 may be respectively placed in an injection molding mold, to form the insulating layer on the second section 312.
  • FIG. 5 schematically illustrates a formed shaft 310 including the insulating layer, which includes the first section 311 and the first insulating coating 401 disposed on the first section 311, the second section 312 and the insulating sleeve 402 disposed on the second section 312.
  • the shaft 310 has a diameter D1 at the first section 311 and a diameter D2 at a second section 312.
  • the diameter D1 may be substantially equal to diameter D2.
  • the formed shaft with a uniform diameter facilitates the synchronization of the acts of the movable contacts 302 of different poles.
  • the circuit breaker according to embodiments of the present disclosure may also have different diameters at the first section 311 and the second section 312.
  • the first section 311 is located in a middle portion of the shaft 310, and the second section 312 includes portions close to both ends of the shaft 310. It should be understood that this is merely exemplary and is not intended to limit the scope of the present disclosure.
  • the positions of the first section and the second section may be set according to actual needs. For example, for a two-pole circuit breaker, the first section and the second section may include a left end portion and a right end portion of the shaft, respectively.

Landscapes

  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (11)

  1. Leistungsschalter (100), der umfasst:
    eine Welle (310) mit einem ersten Abschnitt (311) und einem zweiten Abschnitt (312);
    eine Baugruppe mit beweglichen Kontakten, die auf der Welle (310) entlang einer Erstreckungsrichtung der Welle (310) angeordnet ist und einen beweglichen Kontakt (302) enthält; und
    einen Antriebsmechanismus (105), der mit dem ersten Abschnitt (311) gekoppelt ist,
    wobei die Welle (310) ferner eine Isolierschicht umfasst, die auf dem ersten Abschnitt (311) und dem zweiten Abschnitt (312) angeordnet ist,
    dadurch gekennzeichnet, dass
    der Antriebsmechanismus (105) so ausgelegt ist, dass er die Baugruppe mit beweglichen Kontakten so antreibt, dass sie sich mit der Welle (310) dreht, so dass der bewegliche Kontakt (302) mit einem stationären Kontakt (304) des Leistungsschalters (100) in Kontakt kommt oder sich von diesem löst.
  2. Leistungsschalter (100) nach Anspruch 1, wobei der erste Abschnitt (311) und der zweite Abschnitt (312) aus einem Metall hergestellt sind und der Durchmesser (d1) des ersten Abschnitts (311) größer ist als der Durchmesser (d2) des zweiten Abschnitts (312).
  3. Leistungsschalter (100) nach Anspruch 1 oder 2, wobei die Isolierschicht eine erste isolierende Beschichtung (401) umfasst, die auf dem ersten Abschnitt (311) angeordnet ist.
  4. Leistungsschalter (100) nach Anspruch 3, wobei die Isolierschicht ferner eine Isolierhülse (402) umfasst, die auf dem zweiten Abschnitt (312) angeordnet ist.
  5. Leistungsschalter (100) nach Anspruch 3, wobei die Isolierschicht ferner eine zweite isolierende Beschichtung und eine auf dem zweiten Abschnitt (312) angeordnete Isolierhülse (402) umfasst.
  6. Leistungsschalter (100) nach Anspruch 4 oder 5, wobei die Dicke der Isolierhülse (402) in einem Bereich von 0,1 mm bis 0,3 mm liegt.
  7. Leistungsschalter (100) nach einem der vorhergehenden Ansprüche, wobei die Isolierschicht, die auf dem zweiten Abschnitt (312) angeordnet ist, durch ein Spritzgussverfahren ausgebildet ist.
  8. Leistungsschalter (100) nach Anspruch 1, wobei die Welle (310) am ersten Abschnitt (311) und am zweiten Abschnitt (312) den gleichen Durchmesser aufweist.
  9. Leistungsschalter (100) nach einem der vorhergehenden Ansprüche, wobei der erste Abschnitt (311) an einem mittleren Teil der Welle (310) angeordnet ist und der zweite Abschnitt (312) Teile umfasst, die an beide Enden der Welle (310) angrenzen.
  10. Leistungsschalter (100) nach einem der vorhergehenden Ansprüche, wobei der Leistungsschalter (100) ein vierpoliger Leistungsschalter ist.
  11. Leistungsschalter (100) nach einem der Ansprüche 1 -9 , wobei der Leistungsschalter (100) ein dreipoliger Leistungsschalter ist.
EP20166458.8A 2019-03-28 2020-03-27 Schutzschalter Active EP3716305B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920409727.3U CN209434123U (zh) 2019-03-28 2019-03-28 一种断路器

Publications (2)

Publication Number Publication Date
EP3716305A1 EP3716305A1 (de) 2020-09-30
EP3716305B1 true EP3716305B1 (de) 2023-08-09

Family

ID=67978870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20166458.8A Active EP3716305B1 (de) 2019-03-28 2020-03-27 Schutzschalter

Country Status (5)

Country Link
EP (1) EP3716305B1 (de)
KR (1) KR102388640B1 (de)
CN (1) CN209434123U (de)
DK (1) DK3716305T3 (de)
PL (1) PL3716305T3 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507454C2 (de) * 1975-02-21 1976-12-23 Ellenberger & Poensgen Mehrpoliger ueberstromschalter
KR101677998B1 (ko) * 2010-12-16 2016-11-22 엘에스산전 주식회사 배선용차단기의 샤프트 어셈블리
KR101545888B1 (ko) * 2011-09-30 2015-08-20 엘에스산전 주식회사 차단기 및 그 차단기의 절연층 제조 방법
KR200485774Y1 (ko) * 2016-08-31 2018-02-21 엘에스산전 주식회사 회전핀 절연 배리어가 구비된 다극 배선용 차단기
CN208077912U (zh) * 2017-12-18 2018-11-09 浙江正泰电器股份有限公司 断路器

Also Published As

Publication number Publication date
KR20200115365A (ko) 2020-10-07
CN209434123U (zh) 2019-09-24
EP3716305A1 (de) 2020-09-30
KR102388640B1 (ko) 2022-04-19
DK3716305T3 (da) 2023-09-25
PL3716305T3 (pl) 2024-02-12

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