US2703852A - Overvoltage protected induction apparatus - Google Patents

Overvoltage protected induction apparatus Download PDF

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Publication number
US2703852A
US2703852A US244541A US24454151A US2703852A US 2703852 A US2703852 A US 2703852A US 244541 A US244541 A US 244541A US 24454151 A US24454151 A US 24454151A US 2703852 A US2703852 A US 2703852A
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US
United States
Prior art keywords
winding
arrester
voltage
induction apparatus
overvoltage
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 - Lifetime
Application number
US244541A
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English (en)
Inventor
Jack R Meador
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to CA524830A priority Critical patent/CA524830A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US244541A priority patent/US2703852A/en
Priority to JP1332952A priority patent/JPS285821B1/ja
Priority to DEG9683A priority patent/DE1001756B/de
Application granted granted Critical
Publication of US2703852A publication Critical patent/US2703852A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/08—Overvoltage arresters using spark gaps structurally associated with protected apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/404—Protective devices specially adapted for fluid filled transformers

Definitions

  • That patent discloses a protective arrangement, the main feature of which is the application of a plurality of nonlinear resistance shunts betweentaps along the winding. That arrangement represents the best in the prior art that I know of, and it has been used effectively and successfully in a number of such cases. However, I find that it has certhat the shunt resistors are a constant drain on the current and energy of the circuits. In order to tolerance values, the resistance values must be increased, and this tends to lower the protection which they afford.
  • the impulse discharge voltage for the standard AIEE impulse wave is about twice as high as the normal frequency spark over voltage of the arrester.
  • an object of the present invention to provide a protective arrangement in which electrostatic shields can be dispensed with altogether, thereby eliminating all. such limitations in winding design or circuit connection, as well as expense of shielding.
  • FIG. 1 illustrates a side elevation view partly in section of an induction apparatus and an arrangement for the protection thereof in accordance with the invention
  • Fig. 2 is a schematic diagram illustrating the circuit layout in the arrangement illustrated in Fig. 1
  • Fig. 3 is an enlarged cross-sectional view of a protective element shown in Fig. 1.
  • a representative two-legged core-type high-voltage transformer in combination'with the overvoltage protective means of the present'invention is shown mounted in a tank or container 10 filled with an insulating oil or liquid 11.
  • Transformer windings 12 and 13 are arranged in two stacks respectively on the two legs of a magnetic core and are connected in parallel and submerged along with the core in the insulating fluid 11.
  • the numeral 14 identifies the line terminal of the windings while the other terminal 15 is shown as grounded although it may be connected to a line circuit.
  • a plurality of protector an arrester protective device are stacked end to end in electrical contact with each other in a tube 16 of adjacent to windings 12 and 13 with the longitudinal axis of the tube and the common axis of the stack of elements 17 substantially parallel to the axis of the winding.
  • a portion of tube 16 has been shown cut away to expose to view the lightning arrester protector elements which have an over-all length substantially equal to the portion of the winding leg along which the winding is disposed and are so positioned in the tube that the end element at one end of the stack'is disposed opposite and the end element at the other end of the stack is disposed opposite and closely adjacent the other or opposite end of the winding.
  • Relatively short electrical conductors extending through openings in tube 16 electrically connect the end elements of the stack respectively to the winding ends adjacent and opposite thereto while a plurality of similarly short conductors or cross connections 30, also extending through openings in the tube, electrically interconnect the junction between each pair of elements 17, intermediate the ends of the stack, to a corresponding point of each winding located, intermediate the ends of the winding, at approximately the same distance as the junction to which it is connected is located from an end of the winding.
  • Corresponding points here means points that are intended to have'the same potential under operating conditions and the shortness ofthese cross conthat the pair of points so interconnected shall have their potential alike under impulse conditions also.
  • each of the arrestor elements comprise an arc gap 18 connected electrically in series with a resistor disk 19, preferably of the non-linear type.
  • Gap 18 is definedby'a pair of electrodes 20 and 21, respectively part of metal disks'22 and 23, maintained spaced or separated by a spacer of insulating material such as porcelain ring 24.
  • the resistance and gap in series therewith are hermetically sealed within a chamber or enclosure comprising a glass ring 25 with an end wall conducting material, sealed thereto by arrester discharges, it throws the arrangement, the more nonlinear the fusion.
  • Ametal collar 27 is also sealed by fusion to the opposite 'end of theglas's'ring 25 and another end wall plate 28 of metal conducting material is Welded to metal Element 29 represents resilient spring'of conductivematerial bymeans ofwhich the electrode-resistor assembly are maintained by pressure in good electrical contact with end or terminalplates 26 and 28.
  • the free space-within the element or unit 17 is filled with a and pressure.
  • In-aconventional lightning arrester generally'freely ventilated or at *leastcapable of breathing
  • the gasdensityat the gaps may vary by as much as 30% due to variations in the atmospheric temperature and pressure, with corresponding changes in the breakdown voltage of the gaps.
  • the submersion of thearrester with age is d1scharged,not-"merely reduced or distributed.
  • the resistanceelements can be set for much lower values than in the older schemes involving -rnerely*resista'nce shunts betweentapsalong the winding.
  • the' arrester is highly responsiveto the specific' needs of any give'n-winding to be procontainer, insulating fluid in said tected, and provides equivalent protection to all, without being designed forthe peculiarities of anyparticular winding with respect to impulse voltages. Because of this action the auxiliary structures provided of the winding, cerned'about because it is only this is nothing to be conan attempted overvoltage or protection by. an arrester element in shunt for that portion of the winding.
  • ElectromagneticIinduction apparatus comprisinga az'magnetic having a pair 'of spaced winding legs submerged in secure by Letters said :fluid, said winding legs having their axes in sub- 50 5 References Cited in thelfile. of this.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
US244541A 1951-08-31 1951-08-31 Overvoltage protected induction apparatus Expired - Lifetime US2703852A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA524830A CA524830A (fr) 1951-08-31 Appareil a induction protege contre le survoltage
US244541A US2703852A (en) 1951-08-31 1951-08-31 Overvoltage protected induction apparatus
JP1332952A JPS285821B1 (fr) 1951-08-31 1952-08-23
DEG9683A DE1001756B (de) 1951-08-31 1952-08-29 Mit UEberspannungsschutz versehenes elektrisches Geraet mit induktiven Widerstaenden

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US244541A US2703852A (en) 1951-08-31 1951-08-31 Overvoltage protected induction apparatus

Publications (1)

Publication Number Publication Date
US2703852A true US2703852A (en) 1955-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
US244541A Expired - Lifetime US2703852A (en) 1951-08-31 1951-08-31 Overvoltage protected induction apparatus

Country Status (4)

Country Link
US (1) US2703852A (fr)
JP (1) JPS285821B1 (fr)
CA (1) CA524830A (fr)
DE (1) DE1001756B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881357A (en) * 1956-09-03 1959-04-07 Rabus Willy Protective device for high tension transmission lines
US3073993A (en) * 1958-11-12 1963-01-15 Westinghouse Electric Corp Completely protected transformer
US3209241A (en) * 1962-06-13 1965-09-28 Westinghouse Electric Corp Regulating and current limiting transformer system
US3336500A (en) * 1964-04-16 1967-08-15 Bbc Brown Boveri & Cie Evacuated lightning arrester with series connected resistor
US3660719A (en) * 1970-08-26 1972-05-02 Texas Instruments Inc Transient suppression system
US3950676A (en) * 1973-01-11 1976-04-13 Felten & Guilleaume Carlswerk Aktiengesellschaft Transmission line-communications equipment coupling unit having short-circuit and overvoltage protection
DE3337373A1 (de) * 1983-10-14 1985-04-25 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg Stufentransformator mit nicht starr geerdetem sternpunkt
US4604673A (en) * 1984-05-14 1986-08-05 General Electric Company Distribution transformer with surge protection device
US7046492B2 (en) 1997-02-03 2006-05-16 Abb Ab Power transformer/inductor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US745379A (en) * 1902-06-13 1903-12-01 James F Williamson Means for protecting electrical windings from static strains.
US1300127A (en) * 1916-07-21 1919-04-08 Gen Electric Protective device.
US1809895A (en) * 1928-10-08 1931-06-16 Frazer W Gay Protective system for transformers
US2220615A (en) * 1938-01-24 1940-11-05 Ralph R Pittman Electric transformer structure
US2242838A (en) * 1938-10-25 1941-05-20 Howard E Somes Inductive heat treating apparatus
US2276855A (en) * 1940-11-22 1942-03-17 Gen Electric Electrical induction apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US745379A (en) * 1902-06-13 1903-12-01 James F Williamson Means for protecting electrical windings from static strains.
US1300127A (en) * 1916-07-21 1919-04-08 Gen Electric Protective device.
US1809895A (en) * 1928-10-08 1931-06-16 Frazer W Gay Protective system for transformers
US2220615A (en) * 1938-01-24 1940-11-05 Ralph R Pittman Electric transformer structure
US2242838A (en) * 1938-10-25 1941-05-20 Howard E Somes Inductive heat treating apparatus
US2276855A (en) * 1940-11-22 1942-03-17 Gen Electric Electrical induction apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881357A (en) * 1956-09-03 1959-04-07 Rabus Willy Protective device for high tension transmission lines
US3073993A (en) * 1958-11-12 1963-01-15 Westinghouse Electric Corp Completely protected transformer
US3209241A (en) * 1962-06-13 1965-09-28 Westinghouse Electric Corp Regulating and current limiting transformer system
US3336500A (en) * 1964-04-16 1967-08-15 Bbc Brown Boveri & Cie Evacuated lightning arrester with series connected resistor
US3660719A (en) * 1970-08-26 1972-05-02 Texas Instruments Inc Transient suppression system
US3950676A (en) * 1973-01-11 1976-04-13 Felten & Guilleaume Carlswerk Aktiengesellschaft Transmission line-communications equipment coupling unit having short-circuit and overvoltage protection
DE3337373A1 (de) * 1983-10-14 1985-04-25 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg Stufentransformator mit nicht starr geerdetem sternpunkt
US4604673A (en) * 1984-05-14 1986-08-05 General Electric Company Distribution transformer with surge protection device
US7046492B2 (en) 1997-02-03 2006-05-16 Abb Ab Power transformer/inductor

Also Published As

Publication number Publication date
CA524830A (fr) 1956-05-08
DE1001756B (de) 1957-01-31
JPS285821B1 (fr) 1953-11-12

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