GB293705A - A device for protecting transformers, switches, motors, generators, and similar electrical machines and apparatus - Google Patents
A device for protecting transformers, switches, motors, generators, and similar electrical machines and apparatusInfo
- Publication number
- GB293705A GB293705A GB19938/28A GB1993828A GB293705A GB 293705 A GB293705 A GB 293705A GB 19938/28 A GB19938/28 A GB 19938/28A GB 1993828 A GB1993828 A GB 1993828A GB 293705 A GB293705 A GB 293705A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- gases
- change
- causes
- transformers
- 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
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
Landscapes
- Locating Faults (AREA)
Abstract
293,705. Buchholz, M. July 8, 1927, [Convention date]. Transformers. -- The evolution of gases of decomposition &c., for example from transformers or switches when conditions are abnormal, causes the operation of indicating or cut-out devices. For this purpose the gases are led past an electrically heated device so as to cause a change in the rate at which heat is conducted away from the device and therefore a change in the temperature of the device.. According to the arrangement of Fig. 1, when gases ascend from a transformer tank through a tube a, the change in thermal conductivity of the medium surrounding a current-carrying resistance wire or strip c causes a change of temperature of and change of resistance of the wire. This causes a deflection of the needle e<1> of a registering instrument d, and the needle may engage a contact e<2> and operate a signalling or cut-off device. The gases may also operate directly a second contact device f. In a modification, Fig. 2, the wire c lies in a tube containing ether or the like, the expansion of which operates a contact device. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a construction, Fig. 3, in which the heat of the gases causes a wire h to sag and operate a contact device. The wire h is connected to a device i in a casing k to compensate for fluctuations of normal temperature. A modification of the Fig. 1 device is also described in which a second wire c is arranged in a Wheatstone Bridge circuit with the first wire c to compensate for fluctuations of normal temperature. This subject-matter does not appear in the Specification as accepted. Specification 241,228 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE293705X | 1927-07-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB293705A true GB293705A (en) | 1929-11-11 |
Family
ID=6080800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19938/28A Expired GB293705A (en) | 1927-07-08 | 1928-07-09 | A device for protecting transformers, switches, motors, generators, and similar electrical machines and apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB293705A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3680359A (en) * | 1968-05-02 | 1972-08-01 | Mc Graw Edison Co | Transformer having incipient fault detector |
-
1928
- 1928-07-09 GB GB19938/28A patent/GB293705A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3680359A (en) * | 1968-05-02 | 1972-08-01 | Mc Graw Edison Co | Transformer having incipient fault detector |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB566645A (en) | An improved counting device for over voltages | |
GB293705A (en) | A device for protecting transformers, switches, motors, generators, and similar electrical machines and apparatus | |
USRE21148E (en) | Meter base | |
US1879276A (en) | Indicating device for electrical apparatus | |
US1175432A (en) | Thermoscope. | |
US1826886A (en) | Measuring electric conductivity of fluid | |
US1415528A (en) | Recording instrument | |
US1323824A (en) | Instrument for determining critical temperatures | |
US1911350A (en) | Indicating device | |
US1646247A (en) | Apparatus for ascertaining the composition of gaseous mixtures | |
US1615684A (en) | Temperature-indicating device | |
GB336431A (en) | Improvements in and relating to temperature indicators | |
US2026375A (en) | Temperature indicator | |
DE1237803B (en) | Temperature measuring device, especially for measuring points on nuclear reactors | |
GB293034A (en) | Method and apparatus for protecting transformers, switches, motors, generators, and other electrical apparatus | |
GB204499A (en) | A device for showing the temperature conditions of electric machines | |
US1682730A (en) | High-tension electric valve | |
GB280209A (en) | Method of protecting transformers, choking coils, switches, motors, generators, and other electrical apparatus | |
GB297834A (en) | Improvements in or relating to thermally responsive systems in or for electrical apparatus | |
US1669520A (en) | Thermal relay | |
GB465614A (en) | Improvements relating to pyrometers | |
GB190624209A (en) | Improvements in and relating to Maximum Demand Indicators for Electrical Measuring Instruments. | |
GB191424169A (en) | Improvements in and relating to Electrical Measuring Instruments of the Thermal Type. | |
DE373514C (en) | Thermoelectric manometer | |
US1664778A (en) | Thermostat |