EP1665487A1 - Method for controlling an electronic overcurrent trip for low-voltage circuit breakers - Google Patents
Method for controlling an electronic overcurrent trip for low-voltage circuit breakersInfo
- Publication number
- EP1665487A1 EP1665487A1 EP04786191A EP04786191A EP1665487A1 EP 1665487 A1 EP1665487 A1 EP 1665487A1 EP 04786191 A EP04786191 A EP 04786191A EP 04786191 A EP04786191 A EP 04786191A EP 1665487 A1 EP1665487 A1 EP 1665487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signals
- current
- signal
- voltage circuit
- low
- 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- Withdrawn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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Definitions
- the invention relates to a method for controlling an electronic overcurrent release for low-voltage circuit breakers with the features mentioned in the preamble of claim 1.
- overcurrent releases are used to detect the event of an overcurrent event (e.g. short circuit) in good time and to prevent damage or destruction of the low-voltage circuit breaker by suitable means, e.g. means for immediate disconnection of the contacts.
- overcurrent event e.g. short circuit
- the current flowing through the low-voltage circuit breaker is determined. According to the state of the art, this can be achieved, for example, by air coils which are arranged near the current-carrying elements of the low-voltage circuit breaker.
- the current-carrying conductor generates a magnetic field, the change in time of which in the coil leads to a voltage.
- This voltage signal is regularly converted into a digital signal by means of an analog-digital converter, which is integrated and represents a variable for the current flowing through the low-voltage circuit breaker within a time interval.
- This digitized current signal is fed to a microprocessor, which evaluates the individual, temporally successive current signals. If a disproportionate current rise (overcurrent event) is concluded from the digitized current signal, the microprocessor adjusts Signal available which activates a trigger for short-circuit protection.
- Another disadvantage is that only those faults can be recognized which have a significant influence (three times the previous current value) on the current values. Smaller faults, which do not reach three times the previous current value, can also lead to false tripping of the overcurrent release if they occur several times.
- a particular advantage of the method according to the invention for controlling an electronic overcurrent release for low-voltage circuit breakers is that it has a lower susceptibility to faults due to faults caused by power supplies or EMC influences. Characterized in that signals whose current value is not between the current values of the previous signal and the subsequent signal or whose current value does not match the current values of the previous one Signals or the subsequent signal matches classified as potentially faulty signals and can be checked by means of further criteria, it is also possible to identify and filter such faults which have a smaller influence on the digitized current values than three times the previous stir value.
- those signals classified as potentially faulty are not included in the evaluation for the assessment of an overcurrent event, the current values of which exceed the current values of the preceding signal by a predetermined value.
- the digitized current signals are preferably generated for the effective values of the current flowing through the low-voltage circuit breaker.
- the evaluation and filtering of the digitized current signals according to the criteria mentioned above is preferably carried out by a data processing device.
- the data processing device is a microprocessor.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10343350A DE10343350A1 (en) | 2003-09-12 | 2003-09-12 | Method of controlling an electronic overcurrent release for low voltage circuit breakers |
PCT/DE2004/001909 WO2005027292A1 (en) | 2003-09-12 | 2004-08-24 | Method for controlling an electronic overcurrent trip for low-voltage circuit breakers |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1665487A1 true EP1665487A1 (en) | 2006-06-07 |
Family
ID=34305906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04786191A Withdrawn EP1665487A1 (en) | 2003-09-12 | 2004-08-24 | Method for controlling an electronic overcurrent trip for low-voltage circuit breakers |
Country Status (5)
Country | Link |
---|---|
US (1) | US7724488B2 (en) |
EP (1) | EP1665487A1 (en) |
CN (1) | CN1849734A (en) |
DE (1) | DE10343350A1 (en) |
WO (1) | WO2005027292A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102044381B (en) * | 2009-10-16 | 2013-05-08 | 张世兴 | Precision tripping device |
US9488714B2 (en) | 2013-03-15 | 2016-11-08 | General Electric Company | Methods and systems for continuous calibration of circuit breaker trip units and metering devices |
DE102017127983A1 (en) | 2017-11-27 | 2019-05-29 | Beckhoff Automation Gmbh | FUSE MODULE AND FIELD BUS SYSTEM WITH FUSE MODULE |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4347581A (en) | 1979-09-24 | 1982-08-31 | Tokyo Shibaura Denki Kabushiki Kaisha | Input setting method for digital operational devices |
US4456867A (en) * | 1983-04-20 | 1984-06-26 | Westinghouse Electric Corp. | Motor control apparatus with input validator |
US4767996A (en) * | 1986-01-20 | 1988-08-30 | Kabushiki Kaisha Toshiba | Fault current detection device for a D.C. network |
EP0346687B1 (en) * | 1988-06-13 | 1993-08-04 | Siemens Aktiengesellschaft | Method of suppressing interference in ultrasonic distance measurement |
JPH02101921A (en) | 1988-10-05 | 1990-04-13 | Toshiba Corp | Overload current detection device |
JPH04364316A (en) * | 1991-06-11 | 1992-12-16 | Toyota Autom Loom Works Ltd | Overcurrent detecting system |
JP2857529B2 (en) * | 1992-03-04 | 1999-02-17 | 三菱電機株式会社 | Circuit breaker |
JPH077838A (en) | 1993-06-16 | 1995-01-10 | Toshiba Corp | Controller for circuit breaker |
JPH08214445A (en) | 1995-02-07 | 1996-08-20 | Toshiba Corp | Circuit breaker |
US6625550B1 (en) * | 1998-02-19 | 2003-09-23 | Square D Company | Arc fault detection for aircraft |
US6434715B1 (en) * | 1999-06-14 | 2002-08-13 | General Electric Company | Method of detecting systemic fault conditions in an intelligent electronic device |
US6545849B1 (en) * | 1999-12-20 | 2003-04-08 | General Electric Company | Instantaneous fault detection circuit method and apparatus |
US6671151B2 (en) * | 2001-10-03 | 2003-12-30 | Eaton Corporation | Network protector relay and method of controlling a circuit breaker employing two trip characteristics |
US6731487B2 (en) * | 2002-03-20 | 2004-05-04 | General Electric Company | Method and devices for optimizing power consumption of trip units containing microprocessors |
-
2003
- 2003-09-12 DE DE10343350A patent/DE10343350A1/en not_active Ceased
-
2004
- 2004-08-24 EP EP04786191A patent/EP1665487A1/en not_active Withdrawn
- 2004-08-24 US US10/571,562 patent/US7724488B2/en not_active Expired - Fee Related
- 2004-08-24 WO PCT/DE2004/001909 patent/WO2005027292A1/en active Application Filing
- 2004-08-24 CN CNA2004800263904A patent/CN1849734A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2005027292A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005027292A1 (en) | 2005-03-24 |
US20070086139A1 (en) | 2007-04-19 |
DE10343350A1 (en) | 2005-04-21 |
CN1849734A (en) | 2006-10-18 |
US7724488B2 (en) | 2010-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20060201 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17Q | First examination report despatched |
Effective date: 20060807 |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB IT |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PANCKE, ANDREAS Inventor name: REDMANN, ILKA Inventor name: KRAUSS, ANDREAS Inventor name: NEIDHARDT, KLAUS |
|
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 |
|
18D | Application deemed to be withdrawn |
Effective date: 20100302 |