EP1053555A1 - Verfahren und vorrichtung zum betrieb eines leistungsschalters - Google Patents
Verfahren und vorrichtung zum betrieb eines leistungsschaltersInfo
- Publication number
- EP1053555A1 EP1053555A1 EP99907324A EP99907324A EP1053555A1 EP 1053555 A1 EP1053555 A1 EP 1053555A1 EP 99907324 A EP99907324 A EP 99907324A EP 99907324 A EP99907324 A EP 99907324A EP 1053555 A1 EP1053555 A1 EP 1053555A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- circuit breaker
- magnet
- electromagnet
- voltage
- 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- Withdrawn
Links
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
- H01H71/1081—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
Definitions
- the invention relates to a method and a device for operating a circuit breaker having an Uberstro release and at least one electromagnet depending on its operating state when a short circuit occurs and can be used to protect electrical engineering systems.
- circuit breakers have tripping magnets which are integrated in the tripping circuit. Such a low-voltage circuit breaker is described in US 4,377,837 A. The tripping magnet is built into the circuit breaker and interacts with a latching device.
- circuit breakers can contain further electromagnets, which can be used, for example, as a solenoid for releasing a
- a short circuit occurs in a switchgear, it can be important to protect a system, a consumer and, in particular, a circuit breaker, whether the short circuit occurs during operation, i.e. when the switch contacts are closed, or only when the switch contacts close. 2 While in the event of a short-circuit during operation, i.e. with the switch contacts closed, the circuit breaker may only trip after a specified, set delay for reasons of selectivity, in the event of a short circuit when the switch contacts close, it is sensible to open the circuit breaker immediately. This effectively protects the circuit breaker and the entire system from the effects of the short-circuit current.
- the electronic overcurrent release is self-supplied, that is, the release is only activated after the switch contacts are closed.
- the overcurrent release cannot detect whether the switch contacts were already closed before they were activated. There is therefore no possibility of carrying out the sensible measure described.
- the invention is therefore based on the object of providing a method and a device with which reliable detection is made possible using simple means and using already existing components as to whether the circuit breaker is switched on to an existing short circuit.
- a particular advantage of the invention consists in the fact that in the circuit breakers there are already electrical magnets for detecting a coincidence of the switching on and the occurrence or presence of a short-circuit current 3 are used by generating a control command for the instantaneous tripping of the circuit breaker when an output variable signaling a switch-on operation is generated on an evaluation circuit connected to a winding of the electromagnet and simultaneous detection of a short-circuit current by the overcurrent release.
- Another advantage of the invention is that the acquisition of a signal related to the switching process is not limited to the tripping magnet, but this signal also from other electromagnets arranged in the circuit breaker, for example from work or. Auxiliary magnets that can be derived. It is also possible to use several electromagnets. What is decisive for the selection here is which magnets in addition to the
- Tripping magnet are arranged in the circuit breaker and which magnet or which magnets are or are best suited after the assembly in the switch for the purposes of generating an induced voltage from the switch vibration. Further technical criteria for the selection of the electromagnets to be used are the number of turns and the structure of the magnetic circuit.
- Figure 1 is a schematic representation of a circuit breaker
- FIG. 3 shows a stylized oscillogram of the decaying pulsed alternating voltage generated by the vibration when the switch contacts close in the release magnet.
- FIG. 4 shows a stylized oscillogram of the decaying DC voltage generated by integration from the AC voltage.
- a circuit breaker 1 has the following essential components or assemblies:
- Overcurrent release 2 current transformer 3, first and second evaluation circuits 4 and 5, release magnet 6 for switching on with latching 7, spring accumulator 8, cam 9, manual transmission 10, switching linkage 11, switching shaft 12, switching mechanism 13 with trigger magnet 14, contact force spring 15 with carrier 16 of the movable one Switching contact 17, fixed switching contact 18 and main current path 19.
- a further trigger magnet 20 with associated evaluation circuit 21 is also provided as an accessory if required.
- the signals on the tripping magnet 14 present in each circuit breaker 1 are evaluated in order to detect the coincidence of just switching on and the occurrence of a short-circuit current and the resulting instantaneous tripping of a circuit breaker 1.
- further electromagnets 6, 20 in the recognition process instead of the trigger magnet 14 or in addition to the trigger magnet 14.
- Such further work or Auxiliary magnets can be solenoids for releasing a spring-loaded device for remote activation, electromagnets in undervoltage releases or electromagnets in additional shunt releases.
- the trigger magnet 14 with its components coil, coil body, permanent magnet and plunger forms a sensor in the present exemplary embodiment, in which slight movements of the plunger in the coil body occur due to vibrations. These vibrations, caused by the switching process, induce an alternating voltage in the coil. Due to the mechanical energy released when the switch contacts 17, 18 are closed, the trigger magnet 14 is shaken so that the decaying pulsed AC voltage induced in its coil reaches a sufficient size for detection and evaluation. In the present exemplary embodiment, these pulses have subsided after approximately 30 milliseconds.
- the induced decaying pulsed AC voltage shown in FIG. 3 can be used for effective evaluation
- the DC voltage generated via the integrator circuit is now evaluated by a microcontroller on an analog / digital converter channel. This evaluation is carried out in such a way that, in the event of an overcurrent trip of the circuit breaker 1 and the presence of an induced voltage or of the decaying DC voltage signal derived therefrom, the circuit breaker 1 trips again, whereas, in the event of an overcurrent trip of the circuit breaker 1 without the presence of an induced voltage or one of them 6 derived DC signals of the circuit breaker 1 with a predetermined delay realizes the trip.
- the mode of operation of the circuit breaker 1 with instantaneous tripping in the event of a short circuit is therefore based on the fact that the trigger is activated by the current flow in the circuit breaker and immediately detects a short circuit current and can also recognize whether or not on the basis of the level or the presence of the direct current signal the switch contacts 17, 18 have just been closed. Depending on this information, you can now react appropriately, i.e. switch off either immediately or after a delay.
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998106345 DE19806345A1 (de) | 1998-02-12 | 1998-02-12 | Verfahren und Vorrichtung zum Betrieb eines Leistungsschalters |
DE19806345 | 1998-02-12 | ||
PCT/DE1999/000375 WO1999041759A1 (de) | 1998-02-12 | 1999-02-05 | Verfahren und vorrichtung zum betrieb eines leistungsschalters |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1053555A1 true EP1053555A1 (de) | 2000-11-22 |
Family
ID=7857884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99907324A Withdrawn EP1053555A1 (de) | 1998-02-12 | 1999-02-05 | Verfahren und vorrichtung zum betrieb eines leistungsschalters |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1053555A1 (de) |
JP (1) | JP2004500680A (de) |
DE (1) | DE19806345A1 (de) |
WO (1) | WO1999041759A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ300000B6 (cs) * | 2001-09-10 | 2009-01-14 | Lekov A.S. | Jistic proti proudovému pretížení stejnosmerného proudového obvodu |
CN102737917A (zh) * | 2011-04-02 | 2012-10-17 | 三信国际电器上海有限公司 | 过电流保护用断路器 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4166260A (en) * | 1978-03-29 | 1979-08-28 | General Electric Company | Circuit breaker accessory assembly |
JPS5840750Y2 (ja) * | 1978-08-08 | 1983-09-13 | 三菱電機株式会社 | 電力しや断装置 |
US4377837A (en) * | 1980-04-15 | 1983-03-22 | Westinghouse Electric Corp. | Circuit interrupter with overtemperature trip device |
DE3612119A1 (de) * | 1986-04-08 | 1987-10-22 | Siemens Ag | Anordnung zur montage von hilfsausloesern |
-
1998
- 1998-02-12 DE DE1998106345 patent/DE19806345A1/de not_active Withdrawn
-
1999
- 1999-02-05 EP EP99907324A patent/EP1053555A1/de not_active Withdrawn
- 1999-02-05 JP JP2000531856A patent/JP2004500680A/ja not_active Withdrawn
- 1999-02-05 WO PCT/DE1999/000375 patent/WO1999041759A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9941759A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19806345A1 (de) | 1999-08-19 |
WO1999041759A1 (de) | 1999-08-19 |
JP2004500680A (ja) | 2004-01-08 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20000811 |
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Effective date: 20010622 |
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GRAG | Despatch of communication of intention to grant |
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GRAH | Despatch of communication of intention to grant a patent |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20020723 |