GB350009A - Improvements in the automatic isolation of parallel three-phase electric power transmission lines - Google Patents
Improvements in the automatic isolation of parallel three-phase electric power transmission linesInfo
- Publication number
- GB350009A GB350009A GB7104/30A GB710430A GB350009A GB 350009 A GB350009 A GB 350009A GB 7104/30 A GB7104/30 A GB 7104/30A GB 710430 A GB710430 A GB 710430A GB 350009 A GB350009 A GB 350009A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- circuit
- fault
- contacts
- breaker
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
350,009. Protective cut-out systems. VICTORIA FALLS & TRANSVAAL POWER CO., Ltd., Consolidated Buildings, Fox Street, Johannesburg, South Africa. March 4, 1930, No. 7104. Convention date, Dec. 21, 1929. [Class 38 (v).] For the protection of long parallel-connected transmission lines 4, 5 connecting bus-bars 2, 3 an electrically-interlocked, discriminating, faultprotection relay-arrangement 12, 13, 19 is provided to open one only of the circuit-breakers 7, 9 at the generator end. Underload relays 38, 39 are provided to open the corresponding circuit-breaker 8 or 10 at the far end. The relay 19, which may be a reverse-power relay but is shown as an earthleakage relay, closes on fault one of its sets of contacts 19, 20 or 21, 22 and completes a local circuit to energize one of the time-lay relays 12, 13 through the normally-closed lower contacts of the other relay. If the fault is on the feeder 4, contacts 20, 21 are closed and the relay coil 23 energized through the contacts 29, 30 of the other relay. The relay 12 closes at once and completes the tripping circuit for the circuit-breaker 7. If a fault appears on the feeder 5 (now carrying the load) its circuit-breaker will not be tripped until the relay 12, under retardation, has closed the contacts 27, 28 again. This time interval is long enough normally for the fault to be burnt out. At the far end of the feeder 6 current supplied to the fault from the healthy feeder is of substantially reduced value in at least one of the conductors (i.e. the healthy conductor-the system is not applicable to the unusual case of a fault on all three conductors) and, in consequence, one or other of the low load relays 42 releases its armature to complete the tripping circuit of the circuit-breaker 8. If a period of low load may be normal to the system the contacts of an additional relay 47 is included in the tripping circuit. This relay is energized from all three phases like an earthleakage relay and closes only on fault. The system is stated to be applicable to more than two parallel feeders.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US350009XA | 1929-12-21 | 1929-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB350009A true GB350009A (en) | 1931-06-04 |
Family
ID=21880018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7104/30A Expired GB350009A (en) | 1929-12-21 | 1930-03-04 | Improvements in the automatic isolation of parallel three-phase electric power transmission lines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB350009A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2301125A1 (en) * | 2008-07-07 | 2011-03-30 | ABB Research Ltd. | Method and system for rearranging sound conductors in parallel lines in power transmission |
-
1930
- 1930-03-04 GB GB7104/30A patent/GB350009A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2301125A1 (en) * | 2008-07-07 | 2011-03-30 | ABB Research Ltd. | Method and system for rearranging sound conductors in parallel lines in power transmission |
EP2301125A4 (en) * | 2008-07-07 | 2012-05-30 | Abb Research Ltd | Method and system for rearranging sound conductors in parallel lines in power transmission |
CN102089948B (en) * | 2008-07-07 | 2013-11-06 | Abb研究有限公司 | Method for rearranging sound conductors in parallel lines in power transmission |
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