GB838485A - Improvements in or relating to safety circuit arrangements for polyphase systems - Google Patents
Improvements in or relating to safety circuit arrangements for polyphase systemsInfo
- Publication number
- GB838485A GB838485A GB3067958A GB3067958A GB838485A GB 838485 A GB838485 A GB 838485A GB 3067958 A GB3067958 A GB 3067958A GB 3067958 A GB3067958 A GB 3067958A GB 838485 A GB838485 A GB 838485A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifiers
- transistor
- warning
- current
- relating
- 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
- H02H3/12—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 underload or no-load
- H02H3/13—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 underload or no-load for multiphase applications, e.g. phase interruption
Landscapes
- Rectifiers (AREA)
- Protection Of Static Devices (AREA)
Abstract
838,485. Protective arrangements. MULLARD Ltd. Sept. 25, 1958, No. 30679/58. Class 38 (5). Protection or warning on the failure of the current in one or more phases of a polyphase system is provided by an arrangement comprising current transformers connected in each phase, rectifiers D1 . . . D3 connected to the secondary windings S1 ... S3 of the transformers and an OR logical circuit fed from the rectifiers and controlling a transistor, the output of which is applied to means for deriving a warning or protective signal. The logical circuit may include rectifiers D4 ... D6 which under normal conditions are polarized in the non-conducting direction by the D.C. voltages derived from the rectifiers D1 ... D3. If one of the line currents fails, one of the rectifiers D4 . . . D6 conducts and influences the bias current of the transistor T1 so as to switch off this transistor. This in turn switches off a further transistor T2 to operate the means M which may be a visible or audible warning device or a relay with contacts for interrupting the polyphase supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3067958A GB838485A (en) | 1958-09-25 | 1958-09-25 | Improvements in or relating to safety circuit arrangements for polyphase systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3067958A GB838485A (en) | 1958-09-25 | 1958-09-25 | Improvements in or relating to safety circuit arrangements for polyphase systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB838485A true GB838485A (en) | 1960-06-22 |
Family
ID=10311429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3067958A Expired GB838485A (en) | 1958-09-25 | 1958-09-25 | Improvements in or relating to safety circuit arrangements for polyphase systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB838485A (en) |
-
1958
- 1958-09-25 GB GB3067958A patent/GB838485A/en not_active Expired
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