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US3560794A - Lightning arrester with a rupturable diaphragm for gas pressure release - Google Patents

Lightning arrester with a rupturable diaphragm for gas pressure release Download PDF

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Publication number
US3560794A
US3560794A US832286A US3560794DA US3560794A US 3560794 A US3560794 A US 3560794A US 832286 A US832286 A US 832286A US 3560794D A US3560794D A US 3560794DA US 3560794 A US3560794 A US 3560794A
Authority
US
United States
Prior art keywords
resistors
arrester
pressure release
spark gaps
release device
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
US832286A
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English (en)
Inventor
Hanspeter Christener
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3560794A publication Critical patent/US3560794A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01T1/00—Details of spark gaps
    • H01T1/15—Details of spark gaps for protection against excessive pressure

Definitions

  • a voltage surge arrester comprises one or more columns of stacked spark gaps and resistors located within a closed casing and which are connected electrically in series.
  • the spark gaps and resistors are given an annular configuration thereby to establish a continuous and approximately central channel through them and a pressure relief device is situated in the immediate vicinity of each end of the channel.
  • the invention relates to a voltage surge arrester of which the active part consists of at least one column of stacked spark gaps and resistors located in a closed casing which is provided at least at one point, with a pressure release device. the resistors being ring-shaped.
  • the object of the present invention is to provide a simple and cheap solution for obtaining an explosion-proof surge arrestor, whereby it is possible without any special additional measures to control the thermal and mechanical stresses resulting from over-voltages.
  • the spark gaps which also have an annular shape, and the resistors should be so arranged that the stacked column has a continuous approximately central channel, a pressure release device being provided in the immediate vicinity of each end of the channel.
  • the FIGURE shows a sectional view of a voltage surge arrester for a medium voltage located in an insulting casing l, for instance consisting of ceramic material, and provided at each end with a flange 2 which is cemented to the casing. Screwed on to each flange is a cover 3 with an intermediate seal 4 so that a closed casing is obtained.
  • the covers 3 are not solid but have a central opening which is closed by a fracture diaphragm 5.
  • a stack of resistors 6 and spark gaps 7 is located inside the insulating casing l.
  • the resistors and spark gaps are of annular shape and are so assembled that they are in close contact and have a channel 8 which passes through the middle of the stack.
  • Each end of the channel 8 is in communication with a chamber 9 which is in close proximity to a diaphragm 5.
  • An important feature of this arrangement is that the channel 8 has practically no communication with the annular gap 10 between the insulator l and the stack, so that when disturbing arcs occur all internal pressure stresses are kept away from the insulator l.
  • the axial surfaces of the resistors are metallized. When the axial surfaces are not completely plane, it IS expedient to insert soft metallic rings between the annular resistors 6 when they are being stacked, so that there is a tight joint between the adjoining resistors.
  • the resistors 6 with a conical recess 6a at least on one side of each resistor, whereby the thickness of the resistors is smallest in the region of the central channel 8 so that any breakdown of the resistor elements due to thermal overloading will occur near the channel 8 and the resulting ionized gases will pass into the channel 8 and not into the annular gap 10.
  • the spark gaps 7 are so constructed that between neighboring insulating discs 7a, there is always a sparking chamber 7b in which the electrodes 70 are located at each side of the central channel or bore.
  • the insulating discs 7a have a labyrinth type of seal located at the edge 7d.
  • the electrodes 70 of the spark gaps are connected from one stage to the next by conductor 7e, so that a multiple spark gap is obtained.
  • the first and last electrode are joined by similar conductors 7e to metallic discs 7f which establish contact with the neighboring resistors 6. Due to the fact that the disturbing arcs and the accompanying pressure rises which occur when the arrester is overloaded are restricted to the channel 8 as a result of the construction according to the invention, and the overpressure is released by the fracture of the diaphragm 5 without the insulator housing 1 being stressed at all, it is possible to control overloads and subsequent thermal and mechanical stresses in an absolutely reliable manner.
  • the invention can also be applied to surge arresters which have several columnlike stacks of elements located in a common casing in a known manner. In this case each stack has a central channel which ends at the corresponding pressure release device. In certain cases it may be an advantage if the pressure release device may be in the form of a safety valve.
  • Voltage surge arrester the active part of which consists of at least one column of stacked spark gaps and resistors said arrester being located in a closed casing which is provided at least at one point with pressure release device, said resistors being ring shaped, characterized in that the spark gaps and the resistors are assembled in such a manner that the stack has a continuous approximately central channel and that a pressure release device is provided in the immediate vicinity of each end of said channel.

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  • Thermistors And Varistors (AREA)
US832286A 1968-06-12 1969-06-11 Lightning arrester with a rupturable diaphragm for gas pressure release Expired - Lifetime US3560794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH874568A CH483732A (de) 1968-06-12 1968-06-12 Uberspannungsableiter

Publications (1)

Publication Number Publication Date
US3560794A true US3560794A (en) 1971-02-02

Family

ID=4344228

Family Applications (1)

Application Number Title Priority Date Filing Date
US832286A Expired - Lifetime US3560794A (en) 1968-06-12 1969-06-11 Lightning arrester with a rupturable diaphragm for gas pressure release

Country Status (8)

Country Link
US (1) US3560794A (de)
AT (1) AT295628B (de)
BE (1) BE734345A (de)
CH (1) CH483732A (de)
DE (1) DE1911074A1 (de)
FR (1) FR2010739A1 (de)
GB (1) GB1203919A (de)
SE (1) SE361236B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4262318A (en) * 1978-03-03 1981-04-14 Hitachi, Ltd. Zinc-oxide surge arrester
US5208723A (en) * 1990-08-20 1993-05-04 Texas Instruments Incorporated Solid state electronic protector with pressure release
US11322934B2 (en) * 2016-09-13 2022-05-03 Hitachi Energy Switzerland Ag Protection of a surge arrester with a better protection against failure from thermal overload in case of a temporary overvoltage in an electrical grid line

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666575A5 (de) * 1985-02-26 1988-07-29 Bbc Brown Boveri & Cie Ueberspannungsableiter.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144582A (en) * 1960-11-14 1964-08-11 Westinghouse Electric Corp Lightining arrester
US3144583A (en) * 1960-11-14 1964-08-11 Westinghouse Electric Corp Lightining arrester
US3290547A (en) * 1964-10-19 1966-12-06 Mc Graw Edison Co Pressure relief and failure indicating means for arrester

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144582A (en) * 1960-11-14 1964-08-11 Westinghouse Electric Corp Lightining arrester
US3144583A (en) * 1960-11-14 1964-08-11 Westinghouse Electric Corp Lightining arrester
US3290547A (en) * 1964-10-19 1966-12-06 Mc Graw Edison Co Pressure relief and failure indicating means for arrester

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4262318A (en) * 1978-03-03 1981-04-14 Hitachi, Ltd. Zinc-oxide surge arrester
US5208723A (en) * 1990-08-20 1993-05-04 Texas Instruments Incorporated Solid state electronic protector with pressure release
US11322934B2 (en) * 2016-09-13 2022-05-03 Hitachi Energy Switzerland Ag Protection of a surge arrester with a better protection against failure from thermal overload in case of a temporary overvoltage in an electrical grid line
US11682899B2 (en) 2016-09-13 2023-06-20 Hitachi Energy Switzerland Ag Protection of a surge arrester with a better protection against failure from thermal overload in case of a temporary overvoltage in an electrical grid line

Also Published As

Publication number Publication date
FR2010739A1 (de) 1970-02-20
DE1911074B2 (de) 1971-01-07
AT295628B (de) 1972-01-10
BE734345A (de) 1969-11-17
SE361236B (de) 1973-10-22
CH483732A (de) 1969-12-31
DE1911074A1 (de) 1970-01-29
GB1203919A (en) 1970-09-03

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