GB969278A - Improvements relating to supervisory/alarm circuits for electrical equipment - Google Patents
Improvements relating to supervisory/alarm circuits for electrical equipmentInfo
- Publication number
- GB969278A GB969278A GB1871262A GB1871262A GB969278A GB 969278 A GB969278 A GB 969278A GB 1871262 A GB1871262 A GB 1871262A GB 1871262 A GB1871262 A GB 1871262A GB 969278 A GB969278 A GB 969278A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fuses
- circuits
- switching contacts
- parallel
- alarm
- 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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/046—Signalling the blowing of a fuse
Landscapes
- Rectifiers (AREA)
Abstract
969,278. Protective systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. April 9, 1963 [May 15, 1962], No. 18712/62. Heading H2K. In an apparatus, e.g. a rectifier equipment, having a plurality of fuses which may fail independently, the fuses have switching contacts S1 . . . Sn connected in a circuit across which is connected a parallel branch circuit containing means RL for providing an alarm. The failure of one or more fuses and the consequent operation of the associated switching contacts causes the ratio between the resistances of the parallel circuits to vary, the alarm means RL being operated when the ratio reaches a value corresponding to the failure of a predetermined number of fuses. The combined resistance of the parallel circuits also varies so that the total current taken indicates the number of failed fuses. In the arrangement shown the contacts S1 . . . Sn open when the associated fuses fail to remove the short circuits from resistors R2. A milliammeter M may be directly calibrated to indicate the number of failed fuses. Several circuits containing switching contacts may be associated with a common parallel branch circuit, half-wave rectifiers being provided to prevent interaction between the several circuits, Fig. 2 (not shown).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1871262A GB969278A (en) | 1962-05-15 | 1962-05-15 | Improvements relating to supervisory/alarm circuits for electrical equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1871262A GB969278A (en) | 1962-05-15 | 1962-05-15 | Improvements relating to supervisory/alarm circuits for electrical equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
GB969278A true GB969278A (en) | 1964-09-09 |
Family
ID=10117124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1871262A Expired GB969278A (en) | 1962-05-15 | 1962-05-15 | Improvements relating to supervisory/alarm circuits for electrical equipment |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB969278A (en) |
-
1962
- 1962-05-15 GB GB1871262A patent/GB969278A/en not_active Expired
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