GB492730A - Improvements in and relating to protective systems for electric circuits - Google Patents
Improvements in and relating to protective systems for electric circuitsInfo
- Publication number
- GB492730A GB492730A GB34298/36A GB3429836A GB492730A GB 492730 A GB492730 A GB 492730A GB 34298/36 A GB34298/36 A GB 34298/36A GB 3429836 A GB3429836 A GB 3429836A GB 492730 A GB492730 A GB 492730A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inductance
- fault
- coil
- occurrence
- values
- 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
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Landscapes
- Rectifiers (AREA)
Abstract
492,730. Protective arrangements. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 14, 1936, No. 34298. Void. Convention date, Dec. 12, 1935. [Class 38 (iv)] In an ungrounded A.C. transmission system in which, on the occurrence of a ground fault, the unbalanced capacity current to earth is compensated by an inductance connected between the neutral point and earth, adequate compensation of the capacity current for all lengths of line in circuit is obtained by causing the inductance to vary through a range of values on the occurrence of a fault, at least one of which values is that which compensates the capacity current and clears the fault. A three-phase line is protected by an inductance 15 in the form of a transformer, a coil 20 of which is short-circuited over a full wave rectifier 18, 19 and an inductance 16. In this case initially the inductance of the coil 17 is high, but decreases after the occurrence of a fault at a rate dependent on the circuit constants due to D.C. flowing in the coil 20. At one of these decreasing values of inductance, the fault current is compensated. In a modification, the inductance is initially low and rises after the fault occurs. This is obtained by connecting the coil 20 through a Graetz connected rectifier to a condenser which draws a decreasing D.C. from the coil 20 on the occurrence of a fault.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US492730XA | 1935-12-12 | 1935-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB492730A true GB492730A (en) | 1938-09-26 |
Family
ID=21958964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34298/36A Expired GB492730A (en) | 1935-12-12 | 1936-12-14 | Improvements in and relating to protective systems for electric circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB492730A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2168209A (en) * | 1984-12-02 | 1986-06-11 | Wyzsza Szkola Morska | System for compensation of capacitive and active earth currents |
-
1936
- 1936-12-14 GB GB34298/36A patent/GB492730A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2168209A (en) * | 1984-12-02 | 1986-06-11 | Wyzsza Szkola Morska | System for compensation of capacitive and active earth currents |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1134590A (en) | Ground leakage differential protective apparatus | |
| GB492730A (en) | Improvements in and relating to protective systems for electric circuits | |
| US1994279A (en) | Phase angle correction network | |
| US2300940A (en) | Coupling system for carrier currents | |
| GB250242A (en) | Protective device for electric circuits | |
| US1485361A (en) | Means for suppressing the ground currents | |
| GB520605A (en) | Protective arrangement for thermionic valve apparatus | |
| US2431572A (en) | Protection of alternating current electric power systems | |
| GB424968A (en) | Improvements in and relating to electric transformers | |
| US2046050A (en) | Noise suppression system for telephone lines | |
| SU73839A1 (en) | Isolation control device in high voltage three-phase networks | |
| US2212963A (en) | Communication and power system | |
| GB453585A (en) | Improvements in and relating to devices for protecting multiple phase alternating current installations against earth faults | |
| US2348026A (en) | Electric power transmission system | |
| AT118408B (en) | Arrangement for earth fault suppression for two or more capacitively coupled line systems. | |
| GB256627A (en) | Improvements in high frequency signalling systems | |
| US2287991A (en) | Alternating-current electric power system | |
| GB443218A (en) | Improvements in or relating to electric protective arrangements | |
| SU45668A1 (en) | Transformer differential protection device | |
| US1475968A (en) | Best available | |
| GB188551A (en) | Improvements in or relating to systems for transforming the frequency of electric currents | |
| GB535446A (en) | Improvements in and relating to earth leakage protective systems | |
| GB378434A (en) | Improvements in and relating to protective arrangements for electric systems | |
| GB284771A (en) | Improvements in electrical protective arrangements for alternating current systems | |
| GB486672A (en) | Improvements in earth leakage indicating and protective arrangements for electric plants |