CA2488045A1 - Instantaneous overcurrent element for heavily saturated current in a power system - Google Patents
Instantaneous overcurrent element for heavily saturated current in a power system Download PDFInfo
- Publication number
- CA2488045A1 CA2488045A1 CA002488045A CA2488045A CA2488045A1 CA 2488045 A1 CA2488045 A1 CA 2488045A1 CA 002488045 A CA002488045 A CA 002488045A CA 2488045 A CA2488045 A CA 2488045A CA 2488045 A1 CA2488045 A1 CA 2488045A1
- Authority
- CA
- Canada
- Prior art keywords
- distortion
- circuit
- current
- overcurrent element
- current waveform
- 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.)
- Granted
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
- H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
- H02H1/046—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks upon detecting saturation of current transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
Abstract
The instantaneous overcurrent element, used in a microprocessor-based protective relay for a power system, includes a finite impulse response filt er which generally is a cosine filter and is responsive to the current waveform from the current transformer for fault determination unless the distortion i n the current reaches a preselected threshold, at which point a peak detector circuit is used to provide the current magnitude values for fault determination. The RMS value from circuit (88) is compared against the threshold value in comparator (90).
Claims (7)
1. An instantaneous overcurrent element for use in a microprocessor-based protective relay for a power system, comprising:
a digital filter circuit, responsive to a secondary current waveform from a current transformer which is responsive to a current waveform from the power line, for determining the magnitude of the current waveform;
a peak detector circuit responsive to the secondary current waveform for determining the peak magnitude of the current waveform;
a circuit for determining the distortion of the output from the current transformer;
a comparison element for comparing the distortion against a predetermined standard; and a switch connecting the output of the filter circuit to a fault determination circuit when the distortion is less than the predetermined standard and connecting the output of the peak detector to the fault determination circuit when the distortion is above the predetermined standard.
a digital filter circuit, responsive to a secondary current waveform from a current transformer which is responsive to a current waveform from the power line, for determining the magnitude of the current waveform;
a peak detector circuit responsive to the secondary current waveform for determining the peak magnitude of the current waveform;
a circuit for determining the distortion of the output from the current transformer;
a comparison element for comparing the distortion against a predetermined standard; and a switch connecting the output of the filter circuit to a fault determination circuit when the distortion is less than the predetermined standard and connecting the output of the peak detector to the fault determination circuit when the distortion is above the predetermined standard.
2. An overcurrent element of claim 1, wherein the distortion circuit uses the values of the fundamental and the second and third harmonics to determine the distortion.
3. An overcurrent element of claim 1, wherein the distortion circuit calculates the RMS value of the secondary current waveform and uses said RMS value to determine the distortion.
4. An overcurrent element of claim 1, wherein the digital filter circuit includes a pair of orthogonal full cycle Fourier digital filters.
5. An overcurrent element of claim 1, wherein the digital filter circuit includes a cosine filter.
6. An overcurrent element of claim 1, including a timer for preventing the peak detector from being used for a fault determination for a selected period of time following the distortion exceeding the predetermined standard so as to accommodate a transient current increase.
7. An overcurrent element of claim 1, wherein the peak detector circuit is not connected when the peak current is less than a selected pickup current value of the overcurrent multiplied by 1.13 and the fundamental harmonic value is greater than 3/4 of the peak current value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/160,428 US6757146B2 (en) | 2002-05-31 | 2002-05-31 | Instantaneous overcurrent element for heavily saturated current in a power system |
| US10/160,428 | 2002-05-31 | ||
| PCT/US2003/016098 WO2003102506A1 (en) | 2002-05-31 | 2003-05-20 | Instantaneous overcurrent element for heavily saturated current in a power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2488045A1 true CA2488045A1 (en) | 2003-12-11 |
| CA2488045C CA2488045C (en) | 2009-12-08 |
Family
ID=29583148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002488045A Expired - Fee Related CA2488045C (en) | 2002-05-31 | 2003-05-20 | Instantaneous overcurrent element for heavily saturated current in a power system |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6757146B2 (en) |
| EP (1) | EP1509750A1 (en) |
| CN (1) | CN100427887C (en) |
| AU (1) | AU2003239554B2 (en) |
| BR (1) | BR0311426A (en) |
| CA (1) | CA2488045C (en) |
| MX (1) | MXPA04011988A (en) |
| NZ (1) | NZ536831A (en) |
| WO (1) | WO2003102506A1 (en) |
| ZA (1) | ZA200409630B (en) |
Families Citing this family (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2842959B1 (en) * | 2002-07-24 | 2004-12-24 | Airbus France | DEVICE AND METHOD FOR PROTECTION AGAINST OVERCURRENTS IN AN ELECTRIC POWER DISTRIBUTION CABINET |
| US7345863B2 (en) * | 2005-07-14 | 2008-03-18 | Schweitzer Engineering Laboratories, Inc. | Apparatus and method for identifying a loss of a current transformer signal in a power system |
| US8154373B2 (en) * | 2006-07-14 | 2012-04-10 | Schneider Electric USA, Inc. | Circuit breaker-like apparatus with combination current transformer |
| US8321162B2 (en) * | 2007-10-09 | 2012-11-27 | Schweitzer Engineering Laboratories Inc | Minimizing circulating current using time-aligned data |
| US8405944B2 (en) * | 2007-10-09 | 2013-03-26 | Schweitzer Engineering Laboratories Inc | Distributed bus differential protection using time-stamped data |
| US7856327B2 (en) * | 2007-10-09 | 2010-12-21 | Schweitzer Engineering Laboratories, Inc. | State and topology processor |
| DE102008031757A1 (en) * | 2008-07-04 | 2010-01-14 | Siemens Aktiengesellschaft | Accelerator for accelerating charged particles |
| US7675720B1 (en) | 2008-09-10 | 2010-03-09 | Schweitzer Engineering Laboratories, Inc. | Motor protection using accurate slip calculations |
| US8706309B2 (en) | 2010-04-10 | 2014-04-22 | Schweitzer Engineering Laboratories Inc | Systems and method for obtaining a load model and related parameters based on load dynamics |
| US9008850B2 (en) | 2010-08-24 | 2015-04-14 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for under-frequency blackout protection |
| US8965592B2 (en) | 2010-08-24 | 2015-02-24 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for blackout protection |
| US10310480B2 (en) | 2010-08-24 | 2019-06-04 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for under-frequency blackout protection |
| US8792217B2 (en) | 2010-09-15 | 2014-07-29 | Schweitzer Engineering Laboratories Inc | Systems and methods for protection of components in electrical power delivery systems |
| US9128130B2 (en) | 2011-09-15 | 2015-09-08 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for synchronizing distributed generation systems |
| US8981697B2 (en) | 2011-10-07 | 2015-03-17 | Schweitzer Engineering Laboratories, Inc. | Asset condition monitoring in an electric motor |
| US9128140B2 (en) | 2013-09-16 | 2015-09-08 | Schweitzer Engineering Laboratories, Inc. | Detection of a fault in an ungrounded electric power distribution system |
| US10054641B2 (en) | 2013-09-20 | 2018-08-21 | Schweitzer Engineering Laboratories, Inc. | Monitoring synchronization of a motor using stator current measurements |
| US9798342B2 (en) | 2015-02-23 | 2017-10-24 | Schweitzer Engineering Laboratories, Inc. | Detection and correction of fault induced delayed voltage recovery |
| US9912158B2 (en) | 2016-03-16 | 2018-03-06 | Schweitzer Engineering Laboratories, Inc. | Decentralized generator control |
| US9906041B2 (en) | 2016-03-16 | 2018-02-27 | Schweitzer Engineering Laboratories, Inc. | Decentralized generator control |
| US10135250B2 (en) | 2016-05-25 | 2018-11-20 | Schweitzer Engineering Laboratories, Inc. | Inertia compensated load tracking in electrical power systems |
| US10495680B2 (en) | 2017-06-14 | 2019-12-03 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for detecting current transformer ultrasaturation to enhance relay security and dependability |
| US10312694B2 (en) | 2017-06-23 | 2019-06-04 | Schweitzer Engineering Laboratories, Inc. | Mode-based output synchronization using relays and a common time source |
| US11588432B2 (en) | 2017-11-17 | 2023-02-21 | Schweitzer Engineering Laboratories, Inc. | Motor monitoring and protection using residual voltage |
| US10476268B2 (en) | 2018-02-09 | 2019-11-12 | Schweitzer Engineering Laboratories, Inc. | Optimized decoupling and load shedding |
| US10381835B1 (en) | 2018-02-09 | 2019-08-13 | Schweitzer Engineering Laboratories, Inc. | Electric power generator selection, shedding, and runback for power system stability |
| EP3703209B1 (en) | 2019-03-01 | 2022-08-17 | Fundación Circe - Centro de Investigacion de Recursos y Consumos Energéticos | Protection method of an electrical distribution and/or transmission network against short-circuits |
| US11218103B2 (en) | 2019-10-12 | 2022-01-04 | Schweitzer Engineering Laboratories, Inc. | Induction motor slip calculation |
| CN112072610B (en) * | 2020-08-06 | 2022-10-04 | 许继集团有限公司 | Breaker failure protection optimization method and system based on comprehensive difference |
| US11736051B2 (en) | 2021-08-05 | 2023-08-22 | Schweitzer Engineering Laboratories, Inc. | Synchronous motor startup configuration to synchronous mode at a field zero-crossing |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB132678A (en) * | ||||
| US3657605A (en) * | 1969-07-02 | 1972-04-18 | Ass Elect Ind | Overcurrent transient non-responsive trip device |
| US3846675A (en) * | 1973-01-30 | 1974-11-05 | Westinghouse Electric Corp | Molded case circuit breakers utilizing saturating current transformers |
| US4903163A (en) * | 1989-05-09 | 1990-02-20 | The United States Of America As Represented By The Secretary Of The Interior | Directional harmonic overcurrent relay device |
| US5237511A (en) * | 1990-10-29 | 1993-08-17 | Westronic, Inc. | Distribution automation smart remote terminal unit |
| US5224011A (en) * | 1991-04-19 | 1993-06-29 | Gas Research Institute | Multifunction protective relay system |
| CN2280382Y (en) * | 1996-11-25 | 1998-04-29 | 张正刚 | Multi-protection, energy saving starter for ac motor |
| US6160697A (en) * | 1999-02-25 | 2000-12-12 | Edel; Thomas G. | Method and apparatus for magnetizing and demagnetizing current transformers and magnetic bodies |
| US6356421B1 (en) * | 1999-11-29 | 2002-03-12 | Schweitzer Engineering Labs., Inc. | System for power transformer differential protection |
-
2002
- 2002-05-31 US US10/160,428 patent/US6757146B2/en not_active Expired - Lifetime
-
2003
- 2003-05-20 MX MXPA04011988A patent/MXPA04011988A/en active IP Right Grant
- 2003-05-20 BR BR0311426-0A patent/BR0311426A/en not_active Application Discontinuation
- 2003-05-20 CA CA002488045A patent/CA2488045C/en not_active Expired - Fee Related
- 2003-05-20 NZ NZ536831A patent/NZ536831A/en unknown
- 2003-05-20 WO PCT/US2003/016098 patent/WO2003102506A1/en not_active Application Discontinuation
- 2003-05-20 AU AU2003239554A patent/AU2003239554B2/en not_active Ceased
- 2003-05-20 CN CNB038124823A patent/CN100427887C/en not_active Expired - Fee Related
- 2003-05-20 EP EP03734118A patent/EP1509750A1/en not_active Withdrawn
-
2004
- 2004-11-29 ZA ZA200409630A patent/ZA200409630B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN1656359A (en) | 2005-08-17 |
| CA2488045C (en) | 2009-12-08 |
| ZA200409630B (en) | 2006-06-28 |
| AU2003239554A1 (en) | 2003-12-19 |
| AU2003239554B2 (en) | 2008-06-05 |
| WO2003102506A1 (en) | 2003-12-11 |
| BR0311426A (en) | 2005-03-22 |
| NZ536831A (en) | 2006-06-30 |
| EP1509750A1 (en) | 2005-03-02 |
| US6757146B2 (en) | 2004-06-29 |
| MXPA04011988A (en) | 2005-03-07 |
| US20030223171A1 (en) | 2003-12-04 |
| CN100427887C (en) | 2008-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |