GB1266046A - - Google Patents
Info
- Publication number
- GB1266046A GB1266046A GB2840969A GB1266046DA GB1266046A GB 1266046 A GB1266046 A GB 1266046A GB 2840969 A GB2840969 A GB 2840969A GB 1266046D A GB1266046D A GB 1266046DA GB 1266046 A GB1266046 A GB 1266046A
- Authority
- GB
- United Kingdom
- Prior art keywords
- comparator
- bus
- currents
- transformers
- current
- 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
- H02H7/268—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 dc systems
-
- 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
- H02H3/16—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 fault current to earth, frame or mass
-
- 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
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
1,266,046. H.V.D.C. converter systems, protection. NAUCHNO-ISSLEDOVATELSKY INSTITUT POSTOYANNOGO TOKA. 5 June, 1969, No. 28409/69. Headings H2F and H2K. Relates to circuitry for sensing earth faults in the D.C. bus-bar system of an H.V.D.C. converter sub-station. Static converters 1, 2 feed current I 1 to the D.C. bus-bar 3 while static converters 9, 10 draw current I 2 from the bus-bar. D.C. transformers 5, 12 sense the direct currents I 1 , I 2 and feed proportional alternating current magnitudes i 1 , i 2 to a subtractor 6. The difference value (i 1 -i 2 ) is rectified at 7 and fed to a comparator 8. The bus system includes earthing circuits 13, 14, 15 external of the converter sub-station. D.C. transformers 17, 18, 19 sense direct currents I 3 , I 4 , I 5 respectively and produce alternating current magnitudes i 3 , i 4 , i 5 respectively which are a measure of the direct currents. Currents i 3 , i 4 , i 5 are summed in a unit 20 and the sum current is rectified at 21 and fed to the comparator 8 for comparison with current (i 1 -i 2 ). With no earth fault in the bus-system portion bounded by the sensing transformers the difference between absolute magnitudes i 1 and i 2 equals the sum of the absolute magnitudes of currents i 3 , i 4 , i 5 and there will be no output from the comparator 8. With an earth fault at point A for example, currents I 1 , I 2 continue to flow but the earthing circuits 13, 14, 15 are effectively short-circuited and currents I 3 , I 4 , I 5 fall to zero, assuming the fault resistance is ignored. Thus the inputs to comparator 8 are unbalanced and it produces an output signal. Earth faults in portions of the D.C. system outside the portion bounded by the transformers e.g. at points B or C do not produce an output from the comparator 8. The D.C. transformers are energized by primary windings (not shown) connected to an auxiliary A.C. source. It is stated that in a sub-station wherein all the converter units are of one polarity (e.g. all feeding the bus-bars) the D.C. transformer in the common connection of the converters may be directly connected to the comparator 8 and the rectifier 21 may be omitted, The transmission line has a positive and a negative conductor at substantially equal voltages with respect to earth.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2840969 | 1969-06-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1266046A true GB1266046A (en) | 1972-03-08 |
Family
ID=10275161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2840969A Expired GB1266046A (en) | 1969-06-05 | 1969-06-05 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1266046A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7626791B2 (en) | 2006-04-06 | 2009-12-01 | Rolls-Royce Plc | Electrical fault detection |
-
1969
- 1969-06-05 GB GB2840969A patent/GB1266046A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7626791B2 (en) | 2006-04-06 | 2009-12-01 | Rolls-Royce Plc | Electrical fault detection |
| EP1843443A3 (en) * | 2006-04-06 | 2017-02-01 | Rolls-Royce plc | Electrical fault detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |