SE8400499D0 - Digitalt impedansrele - Google Patents
Digitalt impedansreleInfo
- Publication number
- SE8400499D0 SE8400499D0 SE8400499A SE8400499A SE8400499D0 SE 8400499 D0 SE8400499 D0 SE 8400499D0 SE 8400499 A SE8400499 A SE 8400499A SE 8400499 A SE8400499 A SE 8400499A SE 8400499 D0 SE8400499 D0 SE 8400499D0
- Authority
- SE
- Sweden
- Prior art keywords
- impedance
- functions
- quotient
- voltage
- current
- Prior art date
Links
Classifications
-
- 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
- H02H3/40—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 ratio of voltage and current
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8400499A SE441138B (sv) | 1984-02-01 | 1984-02-01 | Digitalt impedansrele |
EP85100711A EP0150814B1 (de) | 1984-02-01 | 1985-01-24 | Digitales Impedanzrelais |
DE8585100711T DE3566756D1 (en) | 1984-02-01 | 1985-01-24 | Digital impedance relay |
US06/696,634 US4636909A (en) | 1984-02-01 | 1985-01-30 | Digital impedance relay |
CA000473313A CA1238107A (en) | 1984-02-01 | 1985-01-31 | Digital impedance relay |
FI850417A FI86782C (sv) | 1984-02-01 | 1985-01-31 | Digitalt impedansrelä |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8400499A SE441138B (sv) | 1984-02-01 | 1984-02-01 | Digitalt impedansrele |
Publications (3)
Publication Number | Publication Date |
---|---|
SE8400499D0 true SE8400499D0 (sv) | 1984-02-01 |
SE8400499L SE8400499L (sv) | 1985-08-02 |
SE441138B SE441138B (sv) | 1985-09-09 |
Family
ID=20354549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8400499A SE441138B (sv) | 1984-02-01 | 1984-02-01 | Digitalt impedansrele |
Country Status (6)
Country | Link |
---|---|
US (1) | US4636909A (sv) |
EP (1) | EP0150814B1 (sv) |
CA (1) | CA1238107A (sv) |
DE (1) | DE3566756D1 (sv) |
FI (1) | FI86782C (sv) |
SE (1) | SE441138B (sv) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE452533B (sv) * | 1986-04-08 | 1987-11-30 | Asea Ab | Forfarande for riktningsdetektering av fel pa en kraftledning samt anordning for genomforande av det nemnda forfarandet |
SE452534B (sv) * | 1986-04-08 | 1987-11-30 | Asea Ab | Forfarande och anordning for reckviddsbegrensning och direktutlosning i samband med skydd av en kraftledning |
US4878143A (en) * | 1987-10-30 | 1989-10-31 | Cooper Power Systems, Inc. | Line current to time interpolator |
SE459946B (sv) * | 1987-12-29 | 1989-08-21 | Asea Ab | Relaeskydd med selektivt fasval foer dubbelledningar |
FI82797C (sv) * | 1989-05-02 | 1991-04-10 | Kone Oy | Förfarande och anordning för att skydda ett dataöverföringsnät |
US6603298B2 (en) * | 2001-07-06 | 2003-08-05 | Schweitzer Engineering Laboratories, Inc. | System for estimating the frequency of the power signal on a power transmission line |
US8108165B2 (en) * | 2008-04-04 | 2012-01-31 | Schweitzer Engineering Laboratories, Inc. | Acquiring phasors outside the frequency tracking range for power protective relays |
US8140283B2 (en) * | 2008-12-24 | 2012-03-20 | Schweitzer Engineering Laboratories, Inc. | Independent frequency measurement and tracking |
US8346402B2 (en) * | 2009-05-11 | 2013-01-01 | Schweitzer Engineering Laboratories Inc | Islanding detection in an electrical power delivery system |
US8373309B2 (en) * | 2009-08-19 | 2013-02-12 | Schweitzer Engineering Laboratories Inc | Systems and methods for asynchronous sampling data conversion |
US8476874B2 (en) | 2009-10-13 | 2013-07-02 | Schweitzer Engineering Laboratories, Inc | Systems and methods for synchronized control of electrical power system voltage profiles |
US9478378B2 (en) | 2013-01-04 | 2016-10-25 | Schweitzer Engineering Laboratories, Inc. | Preventing out-of-synchronism reclosing between power systems |
US10312041B2 (en) | 2015-11-20 | 2019-06-04 | Schweitzer Engineering Laboratories, Inc. | Frequency measurement for electric power delivery system |
US10644493B2 (en) | 2017-05-01 | 2020-05-05 | Schweitzer Engineering Laboratories, Inc. | Power system disturbance detection using power and frequency |
US10312694B2 (en) | 2017-06-23 | 2019-06-04 | Schweitzer Engineering Laboratories, Inc. | Mode-based output synchronization using relays and a common time source |
US11231449B2 (en) | 2018-09-21 | 2022-01-25 | Schweitzer Engineering Laboratories, Inc. | Frequency sensing systems and methods |
US11381084B1 (en) | 2021-10-05 | 2022-07-05 | Schweitzer Engineering Laboratories, Inc. | Frequency measurement for load shedding and accurate magnitude calculation |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE330930B (sv) * | 1969-05-08 | 1970-12-07 | Asea Ab | |
SE373239B (sv) * | 1973-05-21 | 1975-01-27 | Asea Ab | |
CH610112A5 (sv) * | 1976-08-26 | 1979-03-30 | Arn Fritz | |
JPS53141442A (en) * | 1977-05-16 | 1978-12-09 | Tokyo Electric Power Co Inc:The | Distance relay |
JPS6046615B2 (ja) * | 1977-06-13 | 1985-10-17 | 東京電力株式会社 | 保護制御装置 |
JPS55127829A (en) * | 1979-03-27 | 1980-10-03 | Tokyo Shibaura Electric Co | Digital distance relay unit |
GB2055518B (en) * | 1979-08-01 | 1982-11-10 | Tokyo Shibaura Electric Co | Detecting faults in power systems |
US4371908A (en) * | 1979-09-17 | 1983-02-01 | Tokyo Shibaura Denki Kabushiki Kaisha | Digital protective relaying systems |
US4321681A (en) * | 1979-09-21 | 1982-03-23 | Westinghouse Electric Corp. | Protective relay apparatus |
JPS5854825A (ja) * | 1981-09-29 | 1983-03-31 | 株式会社東芝 | 保護継電装置 |
US4464698A (en) * | 1982-09-20 | 1984-08-07 | Hitachi, Ltd. | Protective relay |
-
1984
- 1984-02-01 SE SE8400499A patent/SE441138B/sv not_active IP Right Cessation
-
1985
- 1985-01-24 EP EP85100711A patent/EP0150814B1/de not_active Expired
- 1985-01-24 DE DE8585100711T patent/DE3566756D1/de not_active Expired
- 1985-01-30 US US06/696,634 patent/US4636909A/en not_active Expired - Lifetime
- 1985-01-31 FI FI850417A patent/FI86782C/sv not_active IP Right Cessation
- 1985-01-31 CA CA000473313A patent/CA1238107A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
SE441138B (sv) | 1985-09-09 |
DE3566756D1 (en) | 1989-01-12 |
FI86782B (fi) | 1992-06-30 |
CA1238107A (en) | 1988-06-14 |
EP0150814B1 (de) | 1988-12-07 |
FI86782C (sv) | 1992-10-12 |
EP0150814A2 (de) | 1985-08-07 |
US4636909A (en) | 1987-01-13 |
FI850417A0 (fi) | 1985-01-31 |
EP0150814A3 (en) | 1985-08-28 |
FI850417L (fi) | 1985-08-02 |
SE8400499L (sv) | 1985-08-02 |
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