GB1492181A - Fault detection system for dc transmission line - Google Patents
Fault detection system for dc transmission lineInfo
- Publication number
- GB1492181A GB1492181A GB47017/74A GB4701774A GB1492181A GB 1492181 A GB1492181 A GB 1492181A GB 47017/74 A GB47017/74 A GB 47017/74A GB 4701774 A GB4701774 A GB 4701774A GB 1492181 A GB1492181 A GB 1492181A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- detector
- line
- providing
- transmission
- 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
Landscapes
- Direct Current Feeding And Distribution (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Dc Digital Transmission (AREA)
Abstract
1492181 Detecting faults in D.C. transmission systems; HVDC transmission systems HITACHI Ltd ELECTRIC POWER DEVELOPMENT CO Ltd and TOKYO SHIBAURA ELECTRIC CO Ltd 30 Oct 1974 [2 Nov 1973] 47017/74 Headings H2K and H2F A fault detecting arrangement in a H.V.D.C. transmission system comprises a first detector LD 1 providing a signal when the current at the rectifier-end BA of the transmission line TL rises above a reference level, a second detector LD<SP>1</SP> 2 providing a signal when the current at the inverter-end BB falls below a reference level, and a coincidence circuit AND 1 providing a fault indication when the two signals occur simultaneously. Since the D.C. line may normally be worked in either direction, it is preferable to provide both a current increase and a current decrease detector at each end, two coincidence circuits, e.g. AND 1 , AND 2 , then being necessary. These coincidence circuits may be duplicated, i.e. a pair at each end, and be coupled to the opposite end via a separate transmission link. The reference levels may be fixed values. Alternatively, if the normal line current varies, each detector compares the instantaneous line current with the value of the line current a short time previously, thereby detecting only sudden changes in value.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP48122859A JPS5231067B2 (en) | 1973-11-02 | 1973-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1492181A true GB1492181A (en) | 1977-11-16 |
Family
ID=14846393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB47017/74A Expired GB1492181A (en) | 1973-11-02 | 1974-10-30 | Fault detection system for dc transmission line |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5231067B2 (en) |
| DE (1) | DE2451940C2 (en) |
| GB (1) | GB1492181A (en) |
| SE (1) | SE402190B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9496702B2 (en) | 2013-07-15 | 2016-11-15 | General Electric Company | Method and system for control and protection of direct current subsea power systems |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4628395A (en) * | 1983-11-21 | 1986-12-09 | Mitsubishi Denki Kabushiki Kaisha | Overload protecting circuit for an inverter device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH349687A (en) * | 1954-09-07 | 1960-10-31 | Asea Ab |
-
1973
- 1973-11-02 JP JP48122859A patent/JPS5231067B2/ja not_active Expired
-
1974
- 1974-10-30 GB GB47017/74A patent/GB1492181A/en not_active Expired
- 1974-10-31 DE DE2451940A patent/DE2451940C2/en not_active Expired
- 1974-11-01 SE SE7413772A patent/SE402190B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9496702B2 (en) | 2013-07-15 | 2016-11-15 | General Electric Company | Method and system for control and protection of direct current subsea power systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5231067B2 (en) | 1977-08-12 |
| DE2451940C2 (en) | 1987-01-08 |
| JPS5073158A (en) | 1975-06-17 |
| SE402190B (en) | 1978-06-19 |
| SE7413772L (en) | 1975-05-05 |
| DE2451940A1 (en) | 1975-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19941029 |