GB1301893A - - Google Patents
Info
- Publication number
- GB1301893A GB1301893A GB1301893DA GB1301893A GB 1301893 A GB1301893 A GB 1301893A GB 1301893D A GB1301893D A GB 1301893DA GB 1301893 A GB1301893 A GB 1301893A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- line
- duration
- voltage
- signal
- 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
- 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
- H02H3/44—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 the rate of change of electrical quantities
- H02H3/445—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 the rate of change of electrical quantities of DC quantities
-
- 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
- Dc Digital Transmission (AREA)
Abstract
1301893 Protective arrangements MOSKOVSKY ORDENA LENINA ENERGETICHESKY INSTITUT 11 April 1970 17298/70 Heading H2K In an arrangement for protecting a D.C. transmission line 2 there is provided a unit 4 in which the duration of the derivative of the line voltage whilst it remains of the same polarity is compared with the duration of a reference signal. The unit 4 produces an output signal when the duration of the voltage derivative is longer than that of the reference signal, when there is a fault at a converting station, this output causes a protective unit 6 to provide signal only on a conductor 10 connected through a time delay circuit to the control devices of the transmission line. If the duration of the voltage derivative is shorter than that of the reference signal due to a short circuit on the line 2, then there is no output from the unit 4 to the unit 6 which provides output signals on both conductors 10 and 11, the conductor 11 being directly connected to the control devices of the line. The unit 4 comprises a differentiator 12, an amplifier 13, a flip-flop circuit 15 and a comparison circuit 17. A delay circuit 19 produces a signal to reset the flip-flop circuit 15 a predetermined time after the recovery of the voltage on the line 2.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1729870 | 1970-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1301893A true GB1301893A (en) | 1973-01-04 |
Family
ID=10092731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1301893D Expired GB1301893A (en) | 1970-04-11 | 1970-04-11 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1301893A (en) |
-
1970
- 1970-04-11 GB GB1301893D patent/GB1301893A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |