US2851557A - Protecting device for power condensers - Google Patents

Protecting device for power condensers Download PDF

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Publication number
US2851557A
US2851557A US359144A US35914453A US2851557A US 2851557 A US2851557 A US 2851557A US 359144 A US359144 A US 359144A US 35914453 A US35914453 A US 35914453A US 2851557 A US2851557 A US 2851557A
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Prior art keywords
fuse
condenser
condensers
protecting device
fuses
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Expired - Lifetime
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US359144A
Inventor
Hansson Bror
Bertil C Zetterstedt
Thore D Lindholm
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ABB Norden Holding AB
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ASEA AB
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Priority to US359144A priority Critical patent/US2851557A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/14—Protection against electric or thermal overload
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus

Definitions

  • Power condensers generally consist of a plurality of condenser elements or condenser rolls which are enclosed in a common liquid container and connected to terminals common for all of them.
  • fuses have been inserted in the connections between the elements and the common terminals. These fuse wires have either been surrounded by small paper pipes or been inserted in the condenser elements. In both cases it may happen that the arc appearing when a fuse wire is molten can damage an adjacent fuse or an adjacent condenser element.
  • the present invention concerns an arrangement in power condensers consisting of a plurality of condenser elements with fuses for the different elements in which the difierent fuse wires are enclosed and effectively separated from each other so that the are appearing when a fuse wire is molten cannot have any damaging effect on fuses or condenser elements in the neighbourhood or damage the insulating liquid in the condenser container.
  • all fuse wires are impressed in a block of insulating material, for instance asbestos, pulp or paper impregnated with some synthetic resin.
  • One end of the connections between the condenser elements and the fuses as well as one end of the common terminals are also impressed in said block.
  • the invention is of special importance in condensers insulated by means of a chlorinated insulating liquid, for instance chlorinated difenyl, because by the invention it is ensured that the arc formed at the fuses has no opportunity to disintegrate the said liquid and thus develop hydrochloric acid, which, if formed and distributed in the condenser, could decrease its dielectric strength.
  • the porous material enclosing the fuses may be impregnated with some material preventing it from taking up the insulating liquid for the condenser, for instance some synthetic resin, or the porous material can be mixed up with some material which effectively combines with the liberated hydrochloric acid.
  • the fuse block according to the invention may for instance be manufactured so that the connections and fuse wires are inserted between two plates of porous material, which then are pressed together, and a binder may then be inserted between them.
  • the porous material may be impregnated with some synthetic resin, which after the compression of the material is baked.
  • the porous material may be porous paper, pulp or plates of asbestos or some material of that kind.
  • Fig. 1 shows a cross sectional view taken along line AA of Fig. 2 and;
  • Fig. 2 shows the connections made at the fuses of the composite fuse block.
  • the accompanying drawing shows a fuse block according to the invention.
  • On the drawing 1 designates two thin plates of paper pulp and 2 the connections to the condenser elements, 3 the fuse Wires and 4 the terminal common to all condenser elements.
  • a multipolar fuse block for an electric power condenser comprising a strip of insulating material, a plurality of fuse wires embedded in said strip and serving as individual and separate fuses arranged at a sutficiently insulating distance from each other, connections located in said strip and individually projecting outwardly therefrom and all connected individually each to one end of one of said fuse wires, and a terminal connected to the opposite ends of said fuse wires and also projecting outwardly from said strip.
  • a multipolar fuse block according to claim 1, in which the said insulating material is formed by a pair of thin plates of insulating material tightly joined to each other and said fuse wires being entirely interposed between said plates.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Fuses (AREA)

Description

Sept. 9, 1958 B. HANssoN ET AL 2,851,557
PROTECTING DEVICE FOR POWER CONDENSERS Filed June 2, 1953 d 5 W WM W N f d w mokh V w md Mn mm QZW rZ m m/ Bflmfi T 9 5 Unite rates Patent PROTECTHNG DEVEQE FOR POWER CONDENSERS Bror Hansson, Angby, Berti! C. Zetterstedt, Stockholm, and Thore D. Lintlholm, Hagersten, Sweden, assignors to Allmiinna Svenska Elektriska Aktiebolaget, Vasteras, Sweden, a Swedish corporation Application June 2, 1953, Serial No. 359,144
3 Claims. (Cl. 200-125) Power condensers generally consist of a plurality of condenser elements or condenser rolls which are enclosed in a common liquid container and connected to terminals common for all of them. In order to limit the effect of short circuits which may be caused by faults in the insulating layers of the condensers, fuses have been inserted in the connections between the elements and the common terminals. These fuse wires have either been surrounded by small paper pipes or been inserted in the condenser elements. In both cases it may happen that the arc appearing when a fuse wire is molten can damage an adjacent fuse or an adjacent condenser element.
The present invention concerns an arrangement in power condensers consisting of a plurality of condenser elements with fuses for the different elements in which the difierent fuse wires are enclosed and effectively separated from each other so that the are appearing when a fuse wire is molten cannot have any damaging effect on fuses or condenser elements in the neighbourhood or damage the insulating liquid in the condenser container. According to the invention all fuse wires are impressed in a block of insulating material, for instance asbestos, pulp or paper impregnated with some synthetic resin. One end of the connections between the condenser elements and the fuses as well as one end of the common terminals are also impressed in said block.
The invention is of special importance in condensers insulated by means of a chlorinated insulating liquid, for instance chlorinated difenyl, because by the invention it is ensured that the arc formed at the fuses has no opportunity to disintegrate the said liquid and thus develop hydrochloric acid, which, if formed and distributed in the condenser, could decrease its dielectric strength. According to the invention therefore the porous material enclosing the fuses may be impregnated with some material preventing it from taking up the insulating liquid for the condenser, for instance some synthetic resin, or the porous material can be mixed up with some material which effectively combines with the liberated hydrochloric acid.
Patented Sept. 9, 1958 ice The fuse block according to the invention may for instance be manufactured so that the connections and fuse wires are inserted between two plates of porous material, which then are pressed together, and a binder may then be inserted between them. The porous material may be impregnated with some synthetic resin, which after the compression of the material is baked. The porous material may be porous paper, pulp or plates of asbestos or some material of that kind.
Fig. 1 shows a cross sectional view taken along line AA of Fig. 2 and;
Fig. 2 shows the connections made at the fuses of the composite fuse block.
The accompanying drawing shows a fuse block according to the invention. On the drawing 1 designates two thin plates of paper pulp and 2 the connections to the condenser elements, 3 the fuse Wires and 4 the terminal common to all condenser elements.
We claim as our invention:
1. A multipolar fuse block for an electric power condenser, comprising a strip of insulating material, a plurality of fuse wires embedded in said strip and serving as individual and separate fuses arranged at a sutficiently insulating distance from each other, connections located in said strip and individually projecting outwardly therefrom and all connected individually each to one end of one of said fuse wires, and a terminal connected to the opposite ends of said fuse wires and also projecting outwardly from said strip.
2. A multipolar fuse block according to claim 1, in which the said insulating strip is formed of porous material impregnated with a synthetic resin.
3. A multipolar fuse block, according to claim 1, in which the said insulating material is formed by a pair of thin plates of insulating material tightly joined to each other and said fuse wires being entirely interposed between said plates.
References Cited in the file of this patent UNITED STATES PATENTS 497,680 Nordmann May 16, 1893 871,851 Young Nov. 26, 1907 1,914,871 Siampos June 20, 1933 2,282,849 Beyer May 12, 1942 2,550,119 Marbury et al. Apr. 24, 1951 2,704,341 Stacy et al Mar. 15, 1955 FOREIGN PATENTS 667,397 France June 10, 1929 723,820 Germany Aug. 11, 1942 869,987 Germany Mar. 9, 1953
US359144A 1953-06-02 1953-06-02 Protecting device for power condensers Expired - Lifetime US2851557A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989609A (en) * 1960-01-19 1961-06-20 Ward Russell Fused electrical connector
US3155797A (en) * 1958-10-10 1964-11-03 Avco Corp Destructible fuse elements
US3178622A (en) * 1964-03-26 1965-04-13 Gen Electric Electrical capacitor with thermal fuse
US3367175A (en) * 1958-12-31 1968-02-06 Avco Mfg Corp Ablation sensor

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US497680A (en) * 1893-05-16 nordmann
US871851A (en) * 1907-03-14 1907-11-26 Frederick Wm Young Fuse.
FR667397A (en) * 1928-02-09 1929-10-16 Gardy Sa Electric fuse for high voltages
US1914871A (en) * 1931-07-20 1933-06-20 Siampos Treefon Fuse plug
US2282849A (en) * 1940-09-16 1942-05-12 Cornell Dubilier Electric Electric fuse
DE723820C (en) * 1937-10-21 1942-08-11 Siemens Ag Low-inductance electrical capacitor with fuse to divert high-frequency currents
US2550119A (en) * 1948-08-06 1951-04-24 Westinghouse Electric Corp Signal and protective system for shunt capacitor banks
DE869987C (en) * 1944-05-06 1953-03-09 Hydrawerk Ag Fuse for electrical capacitors
US2704341A (en) * 1952-07-11 1955-03-15 Gen Electric Fused capacitors

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US497680A (en) * 1893-05-16 nordmann
US871851A (en) * 1907-03-14 1907-11-26 Frederick Wm Young Fuse.
FR667397A (en) * 1928-02-09 1929-10-16 Gardy Sa Electric fuse for high voltages
US1914871A (en) * 1931-07-20 1933-06-20 Siampos Treefon Fuse plug
DE723820C (en) * 1937-10-21 1942-08-11 Siemens Ag Low-inductance electrical capacitor with fuse to divert high-frequency currents
US2282849A (en) * 1940-09-16 1942-05-12 Cornell Dubilier Electric Electric fuse
DE869987C (en) * 1944-05-06 1953-03-09 Hydrawerk Ag Fuse for electrical capacitors
US2550119A (en) * 1948-08-06 1951-04-24 Westinghouse Electric Corp Signal and protective system for shunt capacitor banks
US2704341A (en) * 1952-07-11 1955-03-15 Gen Electric Fused capacitors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155797A (en) * 1958-10-10 1964-11-03 Avco Corp Destructible fuse elements
US3367175A (en) * 1958-12-31 1968-02-06 Avco Mfg Corp Ablation sensor
US2989609A (en) * 1960-01-19 1961-06-20 Ward Russell Fused electrical connector
US3178622A (en) * 1964-03-26 1965-04-13 Gen Electric Electrical capacitor with thermal fuse

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