EP0523420B1 - Kurzschlussschnellauslöser - Google Patents

Kurzschlussschnellauslöser Download PDF

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Publication number
EP0523420B1
EP0523420B1 EP19920110723 EP92110723A EP0523420B1 EP 0523420 B1 EP0523420 B1 EP 0523420B1 EP 19920110723 EP19920110723 EP 19920110723 EP 92110723 A EP92110723 A EP 92110723A EP 0523420 B1 EP0523420 B1 EP 0523420B1
Authority
EP
European Patent Office
Prior art keywords
inertia
short circuit
trip device
circuit quick
switching
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.)
Expired - Lifetime
Application number
EP19920110723
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0523420A2 (de
EP0523420A3 (enrdf_load_stackoverflow
Inventor
Stefan Kranz
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0523420A2 publication Critical patent/EP0523420A2/de
Publication of EP0523420A3 publication Critical patent/EP0523420A3/xx
Application granted granted Critical
Publication of EP0523420B1 publication Critical patent/EP0523420B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2472—Electromagnetic mechanisms with rotatable armatures
    • 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
    • H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/44—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay
    • H01H71/446—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay making use of an inertia mass

Definitions

  • the invention relates to a short-circuit quick release for an electrical switching device according to the preamble of claim 1 (US-A-3 940 723).
  • Circuit breakers of conventional design generally have various types of protective devices which, in particular in the event of a short circuit, overcurrent and thermal overload, switch off to avoid damage to the system to be protected and the circuit breaker itself.
  • Common short-circuit releases work electromagnetically, i.e. the strong magnetic field of a short-circuit current usually causes a shaft to rotate, which in turn acts on a locking element of the latching device, for example on a half-wave, the rotation of which immediately leads to the release of the latching and thus to the opening of the contacts in order to prevent their damage by erosion.
  • a short-circuit quick release should keep the short-circuit current in the switched-on state and only open during the switching on of the circuit breaker if a short-circuit already exists in this phase.
  • the switch contacts are designed in relation to the known, maximum possible short-circuit current in such a way that they can hold it for a certain time, possibly until it is switched off by another, for example a thermal release system, in the switch-on phase due to bouncing processes. however, would suffer severe burn-up until destruction.
  • FIG. 1 shows in the left part the simplified electromagnetic trigger mechanism.
  • the correspondingly excessive magnetic field of the power supply 14 attracts the rotary armature 15 in such a way that it in turn transmits a rotary movement to the shaft 12 (cf. arrows).
  • the trigger member 10 attached to the shaft 12 would now normally immediately release the latching device shown in FIG. 2 for the purpose of opening the switching contacts.
  • the locking device is preferably designed as an independent structural unit and has a base plate 30. On this is the tensioning lever 32, which is moved downward in the picture when switched on by the link rod 24 shown in FIG. 2.
  • the spring member 34 is tensioned, including the return spring 35.
  • the preferably disc-shaped swing body 36 (hereinafter referred to as the flywheel) is rotated counterclockwise by approximately 20 ° (see arrows). Due to the inertia of the system, this process takes place with a certain time delay in the millisecond range.
  • the trigger member 10 Up to the expiry of this time, the trigger member 10 is therefore free to move and, in the event of a short circuit that has already occurred, can bring about a rapid triggering in a known manner.
  • the locking member 38 locks the shaft 12 via the holding bracket 11.
  • the stop 44 In addition to the locking lever 40, which snaps into a recess or nose of the flywheel (36) shortly before reaching the blocking position, the stop 44 also serves to fix the flywheel 36 in the blocking position. In this way, the blocking position is reliably maintained over the entire on-time of the Switch.
  • the clamping lever 32 When the switch is switched off, the clamping lever 32 is released by the latching device or its link rod 24. The tensioning lever 32 can now be reset by the spring member 34, whereby it likewise unlocks the locking lever 40 by means of the reset member 42. As a result, the flywheel 36 can return to its starting point due to the restoring force of the restoring spring 35.
  • the selector shaft is designated 17. It is moved by a bell crank 25 via the link rod 24, the knee joint 19a and the driving lever 18 for the purpose of closing the opening of the switching contacts.
  • the bell crank 25 can be operated by manual operation of an operating or switching lever located outside the housing or by a drive.
  • the link rod 24 acts - as already mentioned - on the clamping lever 32 of the locking device.
  • the shaft 12 can rotate in the counterclockwise direction (cf. FIG. 1). It takes the half-shaft 22 in a clockwise direction, with which the ratchet lever 21 drops in the known manner and the latching device, i.e. in particular the links 20, 19b and 19a including driving lever 18 releases.
  • the pivot rod 24 also tilts downward in the figure, releasing the tensioning lever 32.
  • the concept according to the invention results in a significant advantage with regard to the safety of a switchgear compared to conventional systems. Switches without a short-circuit quick release would switch the system on to an existing short-circuit situation, latch and without reaction this could result in serious damage. Conversely, switches with conventional short-circuit fast triggers would switch off a short-circuit current at any time. Again, this is undesirable for the selective grading sought here.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)
EP19920110723 1991-07-13 1992-06-25 Kurzschlussschnellauslöser Expired - Lifetime EP0523420B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914123297 DE4123297C1 (enrdf_load_stackoverflow) 1991-07-13 1991-07-13
DE4123297 1991-07-13

Publications (3)

Publication Number Publication Date
EP0523420A2 EP0523420A2 (de) 1993-01-20
EP0523420A3 EP0523420A3 (enrdf_load_stackoverflow) 1994-08-03
EP0523420B1 true EP0523420B1 (de) 1996-12-11

Family

ID=6436106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920110723 Expired - Lifetime EP0523420B1 (de) 1991-07-13 1992-06-25 Kurzschlussschnellauslöser

Country Status (2)

Country Link
EP (1) EP0523420B1 (enrdf_load_stackoverflow)
DE (1) DE4123297C1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6864450B1 (en) * 2004-05-19 2005-03-08 Eaton Corporation Circuit breaker with delay mechanism

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780694A (en) * 1953-10-30 1957-02-05 Westinghouse Electric Corp Circuit breaker
US2849565A (en) * 1954-07-22 1958-08-26 Ite Circuit Breaker Ltd Short time delay defeater during closing stroke of circuit breaker
US2813170A (en) * 1955-06-09 1957-11-12 Westinghouse Electric Corp Circuit breaker
JPS5341785B2 (enrdf_load_stackoverflow) * 1973-05-21 1978-11-07
DE2511948C3 (de) * 1975-03-19 1978-05-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Strombegrenzender Leistungsschalter
KR900005711Y1 (ko) * 1983-04-11 1990-06-28 미쓰비시전기 주식회사 개폐기의 정지형 트리프장치

Also Published As

Publication number Publication date
EP0523420A2 (de) 1993-01-20
EP0523420A3 (enrdf_load_stackoverflow) 1994-08-03
DE4123297C1 (enrdf_load_stackoverflow) 1993-04-29

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