EP0004351A1 - Lightning arrester device - Google Patents

Lightning arrester device Download PDF

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Publication number
EP0004351A1
EP0004351A1 EP79100798A EP79100798A EP0004351A1 EP 0004351 A1 EP0004351 A1 EP 0004351A1 EP 79100798 A EP79100798 A EP 79100798A EP 79100798 A EP79100798 A EP 79100798A EP 0004351 A1 EP0004351 A1 EP 0004351A1
Authority
EP
European Patent Office
Prior art keywords
lightning arrester
linear resistor
spark gap
linear
arrester 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.)
Withdrawn
Application number
EP79100798A
Other languages
German (de)
French (fr)
Inventor
Nobuo Nagai
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0004351A1 publication Critical patent/EP0004351A1/en
Withdrawn legal-status Critical Current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
    • H01T1/16—Series resistor structurally associated with spark gap
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Definitions

  • the present invention relates to a lightning arrester device for power transmission system which is used for protecting a power transmission line, especially a lightning arrester device utilizing non-linear resistors.
  • Such lightning arrester has no serial gap and the lightning arrester element is formed only by the non-linear resistor whereby a response to lightning voltage application can be performed without any discharge delay.
  • the system voltage AC or DC system voltage
  • the level of protection of the lightning arrester is reduced, a current passing in the normal state is increased to shorten the life of the lightning arrester. Therefore, the level of protection could disadvantageously not be reduced below a specific value.
  • FIG 1 shows an equivalent circuit diagram of the lightning arrester device of the present invention
  • Figure 2 shows a schematic view of the structure thereof.
  • the lightning arrester device of the present invention comprises a serial connection of a first non-linear resistor (1) and a second non-linear resistor (2) which are respectively prepared by sintering a composition of a main component of zinc oxide at high temperature and which have excellent non-linear resistive characteristics and a spark gap device (3) connected in parallel to the second non-linear resistor (2).
  • the first non-linear resistor (1) has a structure of piled up disc elements and the second non-linear resistor (2) has a cyrindrical structure as shown in Figure 4.
  • the spark gap device (3) is formed by cup shaped metal plates which are disposed inside of the cylindrical non-linear resistor (2). That is, the flanges of the metal plates of the . discharge gap device (3) is held by the non-linear resistor (2).
  • the limiting voltage-current characteristic curves in the case of no connection of the spark gap device (3) are given by Figure 3 (A), (B), wherein the lightning voltage (corresponding to level of protection) to nominal spark current i 2 is given by v 3'
  • the spark is formed in the spark gap of the spark gap device (3) to form a short-circuit whereby the level of protection can be reduced to v 2 in Figure 3.
  • the spark gap device (3) is set to create a spark when the current i l in the region of v 2 ⁇ v 1 is passed whereby the limiting voltage characteristic of the embodiment of Figure 1 is given as the full lines (A), (D) in Figure 3, to give the level of protection to v 2 .
  • the spark in the spark gap device (3) is stopped by diminishing the lightning voltage which releases the spark gap device (3).
  • the limiting voltage characteristic of Figure 3(A) is given in the condition applying the normal voltage to ground v 0 to the lightning arrester whereby the above-mentioned low level of protection v 2 can be given without increasing the current passing in the normal state.
  • the spark gap device is disposed inside of the cyrindrical non-linear resistor whereby an additional space for the spark gap device is not required advantageously.
  • the long trunk insulator (6) is formed in a hollow shape and the lightning arrester of the disc type first non-linear resistor (11) and the cyrindrical second non-linear resistor (12) having a same outer diameter are held in the hollow insulator whereby the lightning arrester device which can be used as supporting insulator for power transmission line can be obtained.
  • a diameter of the hollow part of the long trunk insulator (6) is preferably minimized from the economical viewpoint.
  • the spark gap device is disposed inside the second non-linear resistor whereby the diameter of the hollow part of the insulator can be minimized.
  • the reference numeral (7) designates a flange ;
  • (8) designates a metal cover which is disposed at each end of the insulator (6) to form each terminal which is electrically connected to either of the non-linear resistor (11) or (12) ;
  • (9) designates the O-ring for air-tightening ;
  • (10) designates a cement for bonding the insulator (6) to the flange (7) in one body.
  • the lightning arrester device has a simple structure and imparts low level of protection without shortening the life of the lighning arrester.
  • the number of non-linear resistors to the normal voltage can be increased whereby the duty of each non-linear resistor of the lightning arrester device in the normal operation can be reduced to prolong the life of the lightning arrester.
  • the spark gap device is disposed in the non-linear resistor, whereby a size of a container (usually an insulator) can be small when the lightning arrester elements are held in the container.
  • a size of a container usually an insulator

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A lightning arrester device comprises a spark gap device (3) connected in parallel to a part of serial connection of non-linear resistors (1,2) whereby a limiting voltage characteristic as level of protection can be reduced to impart long life of the lightning arrester.

Description

    BACKGROUND OF THE INVENTION:
  • The present invention relates to a lightning arrester device for power transmission system which is used for protecting a power transmission line, especially a lightning arrester device utilizing non-linear resistors.
  • It has been proposed to provide a lightning arrester for power transmission system which has no serial gap and which is a. non- dynamic current type one utilizing excellent non-linear resistive characteristic of a lightning arrester element prepared by sintering a composition comprising a main component of zinc oxide at 1200 to 1300°C in United States Patent No. 3, 806, 765.
  • Such lightning arrester has no serial gap and the lightning arrester element is formed only by the non-linear resistor whereby a response to lightning voltage application can be performed without any discharge delay. On the contrary, the system voltage ( AC or DC system voltage)is continuously applied to the non-linear resistor.
    When a level of protection of the lightning arrester (limiting voltage characteristic)is reduced, a current passing in the normal state is increased to shorten the life of the lightning arrester. Therefore, the level of protection could disadvantageously not be reduced below a specific value.
    • SUMMARY OF THE INVENTION:
  • It is an object of the present invention to overcome the above-mentioned disadvantage.
  • It is another object of the present invention to provide a lightning arrester device which has a level of protection lower than the minimum level of protection attained by the conventional lightning arrester, even though the structure is simple.
    • BRIEF DESCRIPTION OF THE DRAWINGS:
    • Figure 1 is an equivalent circuit diagram of the lightning arrester device of the present invention;
    • Figure 2 is a schematic view of the structure of the lightning arrester device of the present invention;
    • Figure 3 is a limiting voltage-current characteristic diagram for illustrating the operation of the lightning arrester of the present invention;
    • Figure 4 is a sectional view of one embodiment of a spark gap device used in the present invention ; and
    • Figure 5 is a partially sectional view of one embodiment of an insulator including lightning arrester which supports a power transmission cable according to the present invention.
  • In the drawings.the same references designate indentical or corresponding parts.
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS:
  • Figure 1 shows an equivalent circuit diagram of the lightning arrester device of the present invention and Figure 2 shows a schematic view of the structure thereof. As shown in the drawings, the lightning arrester device of the present invention comprises a serial connection of a first non-linear resistor (1) and a second non-linear resistor (2) which are respectively prepared by sintering a composition of a main component of zinc oxide at high temperature and which have excellent non-linear resistive characteristics and a spark gap device (3) connected in parallel to the second non-linear resistor (2). The first non-linear resistor (1) has a structure of piled up disc elements and the second non-linear resistor (2) has a cyrindrical structure as shown in Figure 4. The spark gap device (3) is formed by cup shaped metal plates which are disposed inside of the cylindrical non-linear resistor (2). That is, the flanges of the metal plates of the . discharge gap device (3) is held by the non-linear resistor (2).
  • The operation of the lightning arrester device of the present invention will be illustrated referring to the limiting voltage current characteristic diagram.
  • In the embodiment of Figure 1, the limiting voltage-current characteristic curves in the case of no connection of the spark gap device (3) are given by Figure 3 (A), (B), wherein the lightning voltage (corresponding to level of protection) to nominal spark current i2 is given by v3' On the contrary, in the device of the present invention, when the terminal voltage of the second non-linear resistor (2) reaches to a predetermined value, the spark is formed in the spark gap of the spark gap device (3) to form a short-circuit whereby the level of protection can be reduced to v2 in Figure 3.
  • In Figure 3, the characteristic curves (C), (D) show characteristics of the non-linear resistor (1).
  • The spark gap device (3) is set to create a spark when the current il in the region of v2≧v1 is passed whereby the limiting voltage characteristic of the embodiment of Figure 1 is given as the full lines (A), (D) in Figure 3, to give the level of protection to v2.
  • The spark in the spark gap device (3) is stopped by diminishing the lightning voltage which releases the spark gap device (3).
  • In accordance with the structure of the embodiment of the present invention, the limiting voltage characteristic of Figure 3(A) is given in the condition applying the normal voltage to ground v0 to the lightning arrester whereby the above-mentioned low level of protection v2 can be given without increasing the current passing in the normal state. The spark gap device is disposed inside of the cyrindrical non-linear resistor whereby an additional space for the spark gap device is not required advantageously.
  • As shown in Figure 5, the long trunk insulator (6) is formed in a hollow shape and the lightning arrester of the disc type first non-linear resistor (11) and the cyrindrical second non-linear resistor (12) having a same outer diameter are held in the hollow insulator whereby the lightning arrester device which can be used as supporting insulator for power transmission line can be obtained.
  • , In said structure, a diameter of the hollow part of the long trunk insulator (6) is preferably minimized from the economical viewpoint.
  • In the lightning arrester device of the present invention, the spark gap device is disposed inside the second non-linear resistor whereby the diameter of the hollow part of the insulator can be minimized.
  • In the embodiment of Figure 5, the reference numeral (7) designates a flange ; (8) designates a metal cover which is disposed at each end of the insulator (6) to form each terminal which is electrically connected to either of the non-linear resistor (11) or (12) ; (9) designates the O-ring for air-tightening ; (10) designates a cement for bonding the insulator (6) to the flange (7) in one body.
  • In accordance with the embodiment of the present invention, the lightning arrester device has a simple structure and imparts low level of protection without shortening the life of the lighning arrester.
  • When the level of protection is the same, the number of non-linear resistors to the normal voltage can be increased whereby the duty of each non-linear resistor of the lightning arrester device in the normal operation can be reduced to prolong the life of the lightning arrester.
  • In the structure, the spark gap device is disposed in the non-linear resistor, whereby a size of a container (usually an insulator) can be small when the lightning arrester elements are held in the container. The advantages of the present invention are remarkable in practical use,

Claims (6)

1) A lightning arrester device with a serial connection of a first non-linear resistor and a second non-linear resistor characterized by a spark gap device (3) connected in parallel to at least one (2;12) of said non-linear resistors (1,2; 11,12).
2) A lightning arrestor device according to claim 1, characterized in that the non-linear resistor (1,2;11,12) is made of a sintered product comprising a main component of zinc oxide sintered at high temperature.
3) A lightning arrester device according to one of claims 1 or 2, characterized in that the second non-linear resistor (2;12) is in a cylindrical form and said spark gap device (3) is disposed inside the cylindrical non-linear resistor (2).
4) A lightning arrester device according to one of claims 1 to 3, characterized in that the first non-linear resistor (1;11) has a disc form and the second non-linear resistor (2;12) has a cylindrical form with the same outer diameter.
5) A lightning arrester device according to one of claims 1 to 4, characterized in that the first and second non-linear resistors (1,2;11,12) and said spark gap device (3) are held in an insulator (6).
6) A lightning arrester device according to claim 5, characterized in that each one terminal (8) connected to the non-linear resistor (1,2;11,12) is disposed at each end of said insulator (6).
EP79100798A 1978-03-17 1979-03-15 Lightning arrester device Withdrawn EP0004351A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP31302/78 1978-03-17
JP3130278A JPS54122848A (en) 1978-03-17 1978-03-17 Lightening arrester

Publications (1)

Publication Number Publication Date
EP0004351A1 true EP0004351A1 (en) 1979-10-03

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ID=12327485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100798A Withdrawn EP0004351A1 (en) 1978-03-17 1979-03-15 Lightning arrester device

Country Status (4)

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EP (1) EP0004351A1 (en)
JP (1) JPS54122848A (en)
BR (1) BR7901654A (en)
ES (1) ES478747A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11322913B2 (en) * 2018-09-28 2022-05-03 Hitachi Energy Switzerland Ag Externally gapped line arrester

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823185A (en) * 1981-07-31 1983-02-10 株式会社日立製作所 Arrester

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098592B (en) * 1955-08-22 1961-02-02 Licentia Gmbh Surge arrester with extinguishing spark gap and voltage-dependent resistors for high voltages
DE2647233A1 (en) * 1975-11-28 1977-06-08 Gen Electric Voltage arrester with two nonlinear resistors - has resistors connected in series and one resistor is shunted by discharge gap

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098592B (en) * 1955-08-22 1961-02-02 Licentia Gmbh Surge arrester with extinguishing spark gap and voltage-dependent resistors for high voltages
DE2647233A1 (en) * 1975-11-28 1977-06-08 Gen Electric Voltage arrester with two nonlinear resistors - has resistors connected in series and one resistor is shunted by discharge gap

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11322913B2 (en) * 2018-09-28 2022-05-03 Hitachi Energy Switzerland Ag Externally gapped line arrester

Also Published As

Publication number Publication date
ES478747A1 (en) 1979-08-01
JPS54122848A (en) 1979-09-22
BR7901654A (en) 1979-10-16

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Inventor name: NAGAI, NOBUO