GB740670A - Electric blown fuse indicator - Google Patents
Electric blown fuse indicatorInfo
- Publication number
- GB740670A GB740670A GB36194/53A GB3619453A GB740670A GB 740670 A GB740670 A GB 740670A GB 36194/53 A GB36194/53 A GB 36194/53A GB 3619453 A GB3619453 A GB 3619453A GB 740670 A GB740670 A GB 740670A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- condensers
- lamp
- lamps
- voltage
- 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
Abstract
740,670. Fusible cut-outs. CHASE-SHAWMUT CO. Dec. 30, 1953 [Jan. 2, 1953], No. 36194/53. Class 38 (1). In a blown fuse indicator, the high-frequency component inherent in the arc produced on blowing of the fuse is resonated in an oscillatory circuit to initiate the striking of a glow lamp. In Fig. 1, the fuse 2 is shunted by condensers 4<SP>1</SP>, 4<SP>11</SP> and the primary 51 of an air-cored step-up transformer 5. The secondary 5<SP>11</SP> is connected between earth and a control electrode 6<SP>111</SP> on the outside of a glow lamp 6, the internal electrodes 6<SP>1</SP>, 6<SP>11</SP> of which have a D.C. voltage continuously applied to them of a value between the firing voltage and the extinguishing voltage. On blowing of the fuse, the high-frequency component raises the intensity of the field between electrodes 61, 6<SP>11</SP> sufficiently to ignite the glow lamp which continues to glow until a switch 19 is opened. The transformer 5 may have a core (Fig. 2, not shown) to reduce its dimensions and the secondary may be connected directly to the electrodes 61, 6<SP>11</SP>, thus dispensing with the control electrode. In this embodiment, the D.C. voltage is fed through the secondary winding from a potentiometer with a change-over switch to provide a higher voltage for testing the glow lamp. Fig. 3 shows a similarly connected transformer and glow lamp 6 but the D.C. voltage is supplied through a rectifier 12 with a stabilizer 13. In this arrangement the primary 5<SP>1</SP> is connected to each of three parallel connected distribution lines 1<SP>1</SP>, 1<SP>11</SP>, 1<SP>111</SP>, containing fuses 21, 2<SP>11</SP>, 2<SP>111</SP>, through condensers 4, 4<SP>1</SP>, 4<SP>11</SP>, 4<SP>111</SP>. Two groups of fuses are shown and an indicator may be provided for each group. In a polyphase system (Fig. 4, not shown) a fuse in each phase is provided with an indicator lamp having an individual air-cored transformer and condensers. In Fig. 5 a further embodiment is shown wherein lines 1<SP>1</SP>, 1<SP>11</SP> are each provided with condensers 4<SP>1</SP>, 4<SP>11</SP>, a transformer 5 and a glow lamp 6, the lamps upon ignition operating electromagnetic relays 21, 22 to energize incandescent lamps 24, 25 to give a clearer indication of the blowing of one or both fuses. Fig. 6 shows a glow lamp 6, transformer 5 and lenticular-shaped condensers 41, 4<SP>11</SP> housed in a casing 30 to form a self-contained unit. The condensers may be separate (Fig. 7, not shown) and the lamp and transformer enclosed in a casting of . transparent plastic. To limit the distributed capacity of the transformer secondary, the winding may be made up of a number of separate serially-connected sections (Figs. 8 and 9, not shown). Where it is desired to operate two lamps 6 in parallel, a transformer having two secondaries 5<SP>11</SP>, Fig. 10, is employed connected as shown to the two lamps. These windings operate as H.F. chokes to accommodate slight differences in the firing voltages of the lamps. Fig. 11 shows a similar circuit for three lamps 6 except that each lamp is associated with a section 5<SP>11</SP> of the transformer secondary which is connected in -parallel with the other two sections.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US329428A US2882521A (en) | 1953-01-02 | 1953-01-02 | Blown fuse indicators |
Publications (1)
Publication Number | Publication Date |
---|---|
GB740670A true GB740670A (en) | 1955-11-16 |
Family
ID=23285340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36194/53A Expired GB740670A (en) | 1953-01-02 | 1953-12-30 | Electric blown fuse indicator |
Country Status (3)
Country | Link |
---|---|
US (1) | US2882521A (en) |
DE (1) | DE935562C (en) |
GB (1) | GB740670A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2970279A (en) * | 1957-10-21 | 1961-01-31 | Jr Edward P Donnelly | Starting circuit |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3202978A (en) * | 1961-01-31 | 1965-08-24 | Hydril Co | Electrical remote control and indicating system |
US3184637A (en) * | 1961-12-13 | 1965-05-18 | Decca Ltd | Lamp monitoring apparatus |
US3246319A (en) * | 1963-05-20 | 1966-04-12 | Electronic Eng Co | Rectangular encapsulated panel mounting electrical circuit and indicating lamp assembly |
US3512073A (en) * | 1968-10-28 | 1970-05-12 | Westinghouse Electric Corp | Electrical circuit for indicating the blowing of fuses |
US4857896A (en) * | 1987-10-19 | 1989-08-15 | Square D Company | Polyphase circuit fuse condition indicating device |
DE69506652T2 (en) * | 1994-09-19 | 1999-05-20 | Denso Corp | Starter |
CN201425297Y (en) * | 2009-04-10 | 2010-03-17 | 黎德汪 | Particle fuel burning device |
FR3059854B1 (en) * | 2016-12-02 | 2020-02-07 | Andre Pierronnet | LINE CARRIER CURRENT FILTERING SYSTEM INCLUDING AUTOMATIC FAILURE DETECTION. |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1138170A (en) * | 1913-03-11 | 1915-05-04 | John W Groves | Transformer-protector. |
US2001432A (en) * | 1933-03-11 | 1935-05-14 | Products Prot Corp | Circuit controlling and indicating device |
US2317030A (en) * | 1939-07-21 | 1943-04-20 | Rca Corp | Fuse indicating system |
BE445314A (en) * | 1942-10-05 | |||
US2478908A (en) * | 1946-02-11 | 1949-08-16 | Harold E Edgerton | Electric light-flash-producing system |
US2447658A (en) * | 1946-09-12 | 1948-08-24 | Westinghouse Electric Corp | Shunt capacitor bank |
US2565271A (en) * | 1950-05-13 | 1951-08-21 | Republic Aviat Corp | Automatic temperature indicating system |
-
1953
- 1953-01-02 US US329428A patent/US2882521A/en not_active Expired - Lifetime
- 1953-12-25 DE DEV6676A patent/DE935562C/en not_active Expired
- 1953-12-30 GB GB36194/53A patent/GB740670A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2970279A (en) * | 1957-10-21 | 1961-01-31 | Jr Edward P Donnelly | Starting circuit |
Also Published As
Publication number | Publication date |
---|---|
DE935562C (en) | 1955-11-24 |
US2882521A (en) | 1959-04-14 |
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