EP1821320A1 - Ableiter und verfahren zur messung des leckstroms eines ableiters - Google Patents

Ableiter und verfahren zur messung des leckstroms eines ableiters Download PDF

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Publication number
EP1821320A1
EP1821320A1 EP05814184A EP05814184A EP1821320A1 EP 1821320 A1 EP1821320 A1 EP 1821320A1 EP 05814184 A EP05814184 A EP 05814184A EP 05814184 A EP05814184 A EP 05814184A EP 1821320 A1 EP1821320 A1 EP 1821320A1
Authority
EP
European Patent Office
Prior art keywords
arrestor
bushing
molded
tip
elements stack
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Withdrawn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
EP05814184A
Other languages
English (en)
French (fr)
Other versions
EP1821320A4 (de
Inventor
Atsushi Ito
Satoshi Watahiki
Kazuhiro Saito
Takeshi Iwaida
Masatoshi Nakajima
Shinan Wan
Kazuhisa Adachi
Nobuyuki Sema
Jyunichi Sinagawa
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.)
Hitachi Ltd
SWCC Corp
Original Assignee
Japan AE Power Systems Corp
SWCC Showa Cable Systems Co Ltd
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 claimed from JP2004357915A external-priority patent/JP4460432B2/ja
Priority claimed from JP2004357916A external-priority patent/JP2006165436A/ja
Priority claimed from JP2004357914A external-priority patent/JP4460431B2/ja
Priority claimed from JP2004357913A external-priority patent/JP2006166671A/ja
Priority claimed from JP2005351596A external-priority patent/JP2007158041A/ja
Application filed by Japan AE Power Systems Corp, SWCC Showa Cable Systems Co Ltd filed Critical Japan AE Power Systems Corp
Publication of EP1821320A1 publication Critical patent/EP1821320A1/de
Publication of EP1821320A4 publication Critical patent/EP1821320A4/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure

Definitions

  • the present invention relates to an arrestor.
  • the present invention relates to an arrestor having layered body (hereinafter called “arrestor elements stack”) of two or more nonlinear resistance element (hereinafter called “arrestor element”) containing zinc oxide as the main component.
  • an arrestor is installed to protect electric equipment such as switchgears or transformers from abnormal voltage which invades through the power cable line at the time of the thunderbolt and so on.
  • the arrestor of this type as shown in Fig. 16, the arrestor that the arrestor elements stack 100 is placed vertically on the bottom 110a of the tank 110 filled insulation gas, and is supported by the insulation supporting tube 120 is known (for example, refer to non-patent document No.1), or as shown in Fig. 17, the arrestor to which the bushing 220 is installed in the inner wall of the equipment case 210 hermetically, and the arrestor elements stack 230 is installed removaly in the bushing 220 is known (for example, refer to patent document No.1).
  • reference number 140 shows eccentric shield of high-voltage side
  • reference number 150 shows insulation spacer
  • reference number 160 shows instrumentation box
  • reference number 170 shows adsorbent.
  • the latter arrestor because it is not necessary to provide the separating device, the structure of the equipment becomes simple. And, when the withstand voltage test of the GIS is done, it is not necessary to do the work of collecting or filling insulation gas in the equipment case 210. But, the latter arrestor has following difficult points.
  • the equipment case 210 as an earthed electrode exists in a part of the circumference of the arrester element layered body 230, it is difficult to equalize the voltage distribution of the arrestor element 230a. Therefore, There is a difficult point that the application is restricted to the power cable line for the medium voltage of 22/33kV.
  • the arrestor of this kind of plug-in-type it is necessary to prevent the dielectric breakdown in the boundary by providing the molded body 240 comprising the insulated resin in circumference of the arrestor elements stack 230, and by making the outer surface of the molded body 240 adhere to the inner surface of the insertion hole of the bushing 220, and by ensuring the surface pressure between the outer surface of the molded body 240 and the inner surface of the insertion hole of the bushing 220.
  • the method of making the outer surface shape of the molded body 240 comprising the insulated resin fit in the inner surface shape of the insertion hole of the bushing 220 is known. But, only, by the structure that the outer surface shape of the molded body 240 comprising the insulated resin is merely fitted in the inner surface shape of the insertion hole of the bushing 220, and the molded body 240 comprising the insulated resin is inserted to the insertion hole of the bushing 220, it is difficult to give the effective surface pressure to the boundary between the outer surface of the molded body 240 and the insertion hole of the bushing 220.
  • the method that installs the insulation cap 310 of the same shape as the molded body 240 removably in the insertion hole of the bushing 220 is known.
  • the insulation cap 310 of this kind of structure it is necessary to fit in the outer surface shape of the insulation cap 310 to the inner surface shape of the insertion hole of the bushing 220 so that the gap does not exist at the boundary between the inner surface of the insertion hole of the bushing 220 and the outer surface of the insulation cap 310. Therefore, there is a difficult point that the insulation cap 310 is enlarged beyond necessity.
  • Non-patent document No. 1 The Institute of Electrical Engineers Japan, Technical Report, No.851, 7(Fig.2.10 )
  • Patent document No. 1 Japanese Patent PublicationNo. Hei01-232681 (Fig. 1)
  • This invention was done to solve the aforementioned difficult points.
  • This invention has objects to provide the following arrestor.
  • the arrestor as the first feature of this invention in an opened section of an equipment case housing electrical equipments, provides a bushing installed to cover the opened section hermetically and a molded arrestor elements stack installed in an insertion hole of the bushing removably from outside of the equipment case, and the molded arrestor elements stack provides an arrestor elements stack comprising a layer stack of a plurality of arrestor elements and a molded insulator provided around circumference of the arrestor elements stack, and the molded arrestor elements stack is housed inside of the insertion hole of the bushing throughout its length.
  • the molded arrestor elements stack is sealed by a sealing cover in a state housed inside of the insertion hole of the bushing.
  • the molded insulator is formed by a molded body of insulated rubber.
  • the bushing is formed by rigid plastic resin.
  • a main circuit connection terminal connected to a main circuit conductor of the electrical equipment is provided on the tip of said bushing, and a joint conductor connected to the main circuit connection terminal is provided with the molded arrestor elements stack integrally on the tip of the molded arrestor elements stack.
  • the molded arrestor elements stack provides the arrestor elements stack comprising a layer stack of a plurality of the arrestor elements containing zinc oxide as the main component, a joint conductor connected to high-voltage side of the arrestor elements stack, a pressure metal fitting connected to low-voltage side of the arrestor elements stack, and the molded insulator provided around circumference of the arrestor elements stack.
  • the molded arrestor elements stack is integrated by the molded insulator provided around circumference of the arrestor elements stack.
  • the molded arrestor elements stack is pressed toward the tip of the bushing in the inside of the insertion hole of the bushing.
  • a back-end side spring to which the spring force by pressing force of axial direction is given is installed at the back-end of the molded arrestor elements stack.
  • a inner surface of the insertion hole of the bushing has a tapered inner surface which extends conically from the tip toward the back-end of the bushing, and an outer surface of the molded insulator has a tapered outer surface to fit in the tapered inner surface.
  • a tip side spring to which the spring force by pressing force toward axial direction is given is installed in the tip of the molded arrestor elements stack, and a back-end side spring to which the spring force by pressing force toward axial direction is given is installed in the back-end of the molded arrestor elements stack.
  • the spring constant of the tip side spring is set lower than entire spring constant of the back-end side spring.
  • an insulation cap is removably installed instead of the molded arrestor elements stack exchangeably from outside of said equipment case.
  • the insulation cap provides an insulation cap body installed in the insertion hole of the bushing and having a tapered outer surface to fit in the tapered inner surface of the bushing in the outer surface, a contact component installed in the insertion hole of the bushing and making the high-voltage shielding electrode contact electrically with high-voltage side electrode of the insulation cap body, and a pressure component installed in the insertion hole of the bushing and pressing the insulation cap body toward the tip side of the bushing.
  • a spring is installed between back-end surface of the insulation cap body and tip surface of the pressure component, and given to the spring is spring force by pressing force toward tip direction of the bushing of the pressure component.
  • the circumference of tip of the molded arrestor elements stack is covered with a high-voltage shielding electrode.
  • the back-end of the bushing is led to the outside of the equipment case through the opened section of the equipment case.
  • the electric field of an intermediate section of the arrestor elements stack is controlled by adjustment of the interval between the back-end of the high-voltage shielding electrode and the inner surface of the equipment case.
  • the circumference of the high-voltage shielding electrode is covered by insulation barrier.
  • the high-voltage shielding electrode has an almost same shaped metal fitting as the shape of tip of the bushing, and the metal fitting is embedded in the tip of the bushing concentrically with the bushing.
  • the high-voltage molded body is formed by conductive coating layer coated around circumference of the tip of the bushing.
  • the high-voltage shielding electrode has a cylindrical metal fitting, and the metal fitting is installed around the tip of the bushing to surround the tip of the bushing.
  • a solid insulated layer is provided around the circumference of the high-voltage shielding electrode.
  • the back-end of said bushing is led to the outside of the equipment case through the opened section of the equipment case.
  • a cutoff area of current is provided in the section which extends from an end surface of the back-end of the bushing to the outer wall of the equipment case.
  • the back-end of the bushing is formed by an insulated cylindrical component.
  • the method of measuring leakage current of arrestor in the twenty-seventh feature of this invention has the steps of providing the arrestor in any one of twenty-fourth feature to twenty-sixth feature, installing an earthing conductor between the equipment case forming the arrestor and the low-voltage side of the arrestor elements stack forming the arrestor, and measuring current flowing through the earthing conductor.
  • gas layer is provided between the molded arrestor elements stack and the insertion hole of the bushing.
  • the molded arrestor elements stack including the arrestor elements stack is installed in the bushing, and the circumference of the upper end side (high-voltage side) of the arrestor elements stack is covered by shielding body embedded in the upper cylindrical section, the equalization of the voltage distribution of the arrestor element can be attempted, and consequently, it is possible to adapt the arrestor to the high-voltage power cable line of the 66/77kV grade.
  • the method of measuring leakage current of arrestor of the twenty-seventh feature of this invention because it is possible to provide the cutoff area of current between the outer wall of the equipment case and the low-voltage side of the arrestor elements stack, in the outside of the equipment case, by installing the earthing conductor between the insulated outer wall of the equipment case and the low-voltage side of the arrestor elements stack, it is possible to measure the leakage current of the arrestor elements stack easily. Consequently, it is not necessary to collect or fill insulation gas in the inside of the equipment case when the leakage current is measured. In addition, because it is not necessary to install the insulator in the equipment case, the miniaturization, the simplification, the weight-saving, and the cost reduction can be attempted.
  • Fig.1 is the partial sectional view that shows an example of the arrestor of the 66/77kV grade of this invention.
  • the electrical equipment having the arrestor of this invention provides the equipment case 1 which houses the electrical equipment (not shown) such as the switch and so on hermetically.
  • the insulated gas for example, such as SF 6 gas and so on is filled in the equipment case 1.
  • the opened section 1a is provided at the bottom of the equipment case 1, and in this opened section 1a, the bushing 2 is installed to make the tip of the bushing 2 itself locate in the inside of the equipment case 1 and to cover the opened section 1a in the back-end of the bushing 2 itself hermetically.
  • the molded arrestor elements stack 6 including the after-mentioned arrestor elements stack 61 is installed in this bushing 2 removably.
  • the bushing 2 provides the hard and insulated bushing body 3 comprising the molded body and so on which is formed by the epoxy resin, and the high-voltage shielding electrode 4 embedded together with the bushing body 3 concentrically at the tip of the bushing body 3.
  • the bushing body 3 provides the cylindrical section (hereinafter called “upper cylindrical section”) 51 of upper end closing which has the insertion hole (hereinafter called “upper insertion hole”) 51a to house the upper section of the molded arrestor elements stack 6, and the cylindrical section (hereinafter called “lower cylindrical section”) 52 which has the insertion hole (hereinafter called “lower insertion hole”) 52a to house the lower section of the molded arrestor elements stack 6, and the cylindrical section, (hereinafter called “intermediate cylindrical section”) 53 which has the insertion hole (hereinafter called “tapered insertion hole”) 53a to house the after-mentioned conically-shaped section 67b of the molded arrestor elements stack 6.
  • the annular mounting flange 52b which protrudes in the direction of a diameter is continuously installed in the circumference of the upper position of the lower cylindrical section 52.
  • the diameter of the lower insertion hole 52a is larger than the diameter of the upper insertion hole 51a
  • the tapered insertion hole 53a has the tapered inner surface 53b which extends conically from the tip toward the back-end of the bushing 2, and the upper insertion hole 51a continues to the lower insertion hole 52a through this tapered inner surface 53b.
  • the outside diameter of the lower cylindrical section 52 is nearly equal or slightly small to the diameter of the opened section 1a of the equipment case 1 and the outside diameter of the mounting flange 52b is larger than the diameter of the opened section 1a of the equipment case 1.
  • the high-voltage shielding electrode 4 provides a bell shaped shielding body 41 which is embedded in the upper cylindrical section 51 concentrically astride the closed section 51b and the back-end of the upper cylindrical section 51, and the tubular section (hereinafter called "joint conductor insertion section") 42 which protrudes to the upper direction of the closed section 51b in the center of the horizontal section of the shielding body 41, and the main circuit connection terminal 43 which is formed continuously in the upper section of the joint conductor insertion section 42 and is connected to the main circuit conductor (not shown).
  • the side wall section 41a of the shielding body 41 is formed so as to extend conically from the tip toward the back-end, and the length of the axial direction is the length from the closed section 51b of the upper cylindrical section 51 to the neighborhood of tip of the intermediate cylindrical section 53.
  • the length of the axial direction is the length for making the tip of the aforementioned tapered inner surface 53b locate in the inside of the end of the back-end side of the side wall section 41a of the shielding body 41.
  • the joint conductor insertion section 42 has the function as the insertion hole of the after-mentioned joint conductor 62 of the molded arrestor elements stack 6, and the main circuit connection terminal 43 which is formed at the tip of the joint conductor insertion section 42 has also the function as the stopper of the after-mentioned coiled spring 63 of the molded arrestor elements stack 6.
  • the main circuit connection terminal 43 protrudes from the closed section 51b of the upper cylindrical section 51, and is embedded in the upper cylindrical section 51 concentrically so that the side wall section 41a is located in the side wall section 51b of the upper cylindrical section 51.
  • the bushing 2 of this kind of structure because the upper cylindrical section 51 and the intermediate cylindrical section 53 of the bushing 2 are located in the equipment case 1, and the lower cylindrical section 52 is led to the outside of the equipment case 1 through the opened section 1a, the upper surface of the mounting flange 52b comes in contact with the under surface of the peripheral section of the opened section 1a of the equipment case 1. Therefore, by placing the O-ring P1 in the annular concave groove 1b which is provided in the peripheral section of the opened section 1a of the equipment case 1, and by clenching the bolt V1 which is provided in the mounting flange 52b, it is possible to install the bushing 2 in the opened section 1a of the equipment case 1 hermetically.
  • the molded arrestor elements stack 6 provides the arrestor elements stack 61 which stacked multiple arrestor elements 61a containing zinc oxide as the main component, and the joint conductor 62 which is installed at the tip side (high-voltage side) of the arrestor elements stack 61, and the coiled spring (hereinafter called “tip side spring”) 63 which is installed at the tip side (high-voltage side) of the joint conductor 62, and the pressure metal fitting 64 which is installed at the back-end side (low-voltage side) of the arrestor elements stack 61, and the coiled spring (hereinafter called “back-end side spring”) 66 which is installed under the pressure metal fitting 64, and the molded rubber 67 comprising silicone rubber and so on which is molded integrally astride the joint conductor 62 and the pressure metal fitting 64 in the circumference of the arrestor elements stack 61.
  • tip side spring the coiled spring
  • the shape of the outer surface of the molded rubber 67 is formed so that it may correspond to the shape of inner surface of the insertion hole (the upper insertion hole 51a, the lower insertion hole 52a, the tapered insertion hole 53a) of the bushing 2.
  • the small diameter section 67a which comes in contact with the inner surface of the upper insertion hole 51a is provided in the tip side (high-voltage side) of the molded rubber 67
  • the conically-shaped section 67b which has the tapered outer surface 67c which comes in contact with the tapered inner surface 53b of the tapered insertion hole 53a is provided in the intermediate section of the molded rubber 67
  • the large diameter section 67d which comes in contact with the inner surface of the lower insertion hole 52a is provided in the back-end side (low-voltage side) of the molded rubber 67, respectively.
  • the spring constant of the tip side spring 63 is set lower than entire spring constant of the back-end side spring 66 (the total spring constant of the multiple back-end side spring 66).
  • the number of arrestor elements 61a corresponding to the system voltage is determined in consideration of the predefined varistor voltage. This embodiment applies to the high voltage power cable line of 77kV.
  • the joint conductor 62 provides the circular plate section 62a which is the almost same shape as the arrestor element 61a which comes in contact with the high-voltage side of the arrestor elements stack 61, and the cylindrical section 62b which protrudes toward upper direction in the central section of the upper surface of this circular plate 62a.
  • the annular concave groove 62c is provided in the circumference of the cylindrical section 62b in order to set the tape-like electrical contact (multi-contact) which is not shown in the figure.
  • the pressure metal fitting 64 provides the circular component 65a which has slightly smaller diameter than the outside diameter of the back-end side (low-voltage side) of the molded rubber 67, and the plate-shaped pressing section 65b which is the almost same shape as the arrestor element 61a is provided in the central section of the upper surface of this circular component 65a, and, for example, the twelve concave groove sections 65c are provided so that these are placed along the circumference at regular interval in the neighborhood of circumference of the lower surface side.
  • the reference number 65d in the figure is, for example, four tapped holes which are placed along the circumference at regular interval in the inner periphery of the circular component 65a, and the reference number 65e is the large diameter concave groove section which is provided in the central section of the lower surface side of the circular component 65a.
  • the molded rubber 67 comprising silicone rubber and so on is provided in the state of contacting to the lower surface of the circular plate section 62a of the joint conductor 62 in the tip, and in the state of contacting to the pressing section 65b of the pressure metal fitting 64 in the back-end, and astride the upper surface section of the circular plate section 62a of the joint conductor 62 and the circumference of the pressure metal fitting 64.
  • the arrestor elements stack 61 is integrated together with the joint conductor 62 and the pressure metal fitting 64.
  • the tip side spring 63 is installed in the cylindrical section 62b of the joint conductor 62 so that the upper section of the tip side spring 63 may protrude from the cylindrical section 62b, and the back-end side spring 66 is installed in the concave groove section 65c of the pressure metal fitting 64 so that the lower section of the back-end side spring 66 may protrude from the concave groove section 65c. And, in the state of not giving the spring force to the tip side spring 63 and the back-end side spring 66, as shown in Fig.
  • the tip (high-voltage side) of the molded arrestor elements stack 6 is inserted in the bushing 2, and the tip of the molded arrestor elements stack 6 is pushed until the tip of the tip side spring 63 comes in contact with the inner wall surface of the main circuit connection terminal 43.
  • the individual piece (not shown) which constitutes the electrical contact (multi-contact) which is installed in the cylindrical section 62b comes in contact with the inner peripheral surface of the joint conductor insertion section 42 electrically, furthermore, the small diameter section 67a of the molded rubber 67 comes in contact with the inner peripheral surface of the upper insertion hole 51a of the bushing 2, and the conically-shaped section 67b of the molded rubber 67 comes in contact with the inner peripheral surface of the tapered insertion hole 53c, and the large diameter section 67c of the molded rubber 67 comes in contact with the inner peripheral surface of the lower insertion hole 52a.
  • the outside diameter of the tip side spring 63 is almost same diameter as the inner diameter of the cylindrical section 62b of the joint conductor 62, and the outside diameter of the back-end side spring 66 is almost same as the inner diameter of the concave groove section 65c of the pressure metal fitting 64.
  • the sealing cover F comprising the plate-shapedmetal fitting is made to come in contact with the under surface of the lower cylindrical section 52 of the bushing 2, and is clenched at the under surface of the lower cylindrical section 52 by multiple bolts V2 which is placed along the circumference direction in the neighborhood of circumference of the sealing cover F.
  • the back-end side spring 66 is compressed between the back section of the concave groove section 65c and the upper surface of the sealing cover F, and the spring force of the axial direction is given to the back-end side spring 66.
  • the molded arrestor elements stack 6 is pushed further toward the tip of the bushing 2 by the spring force of the back-end side spring 66, and herewith, the predefined surface pressure is given between the conically-shaped section 67b of the molded rubber 67 and the surface of the inner periphery of the tapered insertion hole 53c, and the tip side spring 63 is compressed between the closed section of the cylindrical section 62b (the upper surface of the joint conductor 62) and the inner wall surface of the main circuit connection terminal 43, and the spring force of the axial direction (the reactive force toward the molded arrestor elements stack 6) is given to the tip side spring 63.
  • the mark N shows the tapped hole which is embedded in the lower surface of the lower cylindrical section 52 of the bushing 2
  • the tip of the bolts V2 is screwed in this tapped holes N.
  • Fig. 3 shows the equipotential distribution figure of the arrestor in this embodiment. From this figure, it is clear that because the tip of the arrestor elements stack 61 is shielded by the high-voltage shielding electrode 4, the electric field does not concentrate to the aforementioned tip of the arrestor elements stack 61, and because the back-end of the arrestor elements stack 61 is installed at the outside of the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned back-end of the arrestor elements stack 61, and furthermore, in the intermediate section of the arrestor elements stack 61, because the electric field is controlled appropriately by adjustment of the interval between the high-voltage shielding electrode 4 and the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned intermediate section of the arrestor elements stack 61.
  • the tip (length of about 1/3 of the arrestor elements stack 61) and the intermediate section (length of about 1/3 of the arrestor elements stack 61) of the arrestor elements stack 61 is located in the equipment case 1
  • the back-end (length of about 1/3 of the arrestor elements stack 61) of the arrestor elements stack 61 is located outside the equipment case 1
  • the interval between the high-voltage shielding electrode 4 and the equipment case 1 as the earthed electrode is adjusted appropriately, and it is possible to control the electric field appropriately in the intermediate section of the arrestor elements stack 61. Consequently, the equalization of the voltage distribution of the arrestor element 61a can be attempted.
  • the arrestor of this kind of structure first, because it is possible to install the arrestor elements stack 61 removably from the outside of the equipment case 1 into the bushing 2 which is installed hermetically at the opened section 1a of the equipment case 1, it is not necessary to install the separation device in hitherto known gas-insulated-tank-type arrestor, and it is possible to simplify the structure of the equipment. Second, when the withstand voltage test is done, it is possible to make collecting or filling operation of the insulation gas of the inside of the equipment case 1 unnecessary. Third, by leading a part (low-voltage side) of the arrestor elements stack 61 outside of the equipment case 1, the miniaturization of the equipment can be attempted.
  • the molded arrestor elements stack 6 including the arrestor elements stack 61 in the bushing 2, because the circumstance of the upper end side (high-voltage side) of the arrestor elements stack 61 is covered by the shielding body 41 embedded in the upper cylindrical section 51, the equalization of the voltage distribution of the arrestor element 61a can be attempted, and consequently, it is possible to adapt to the high voltage power cable line of the 66/77kV grade.
  • Fig . 4 shows the partial sectional view of the arrestor in the second embodiment of this invention. Meanwhile, in this figure, the same reference numbers are given to the portions which are common to Fig.1, and detailed explanation is omitted.
  • the cutoff area of current Z is formed at the back-end of the bushing 2 which is led to the outside of the equipment case 1.
  • the cutoff area of current Z is formed in the section which extends from the end surface of the back-end of the lower cylindrical section 52 as the insulated cylindrical component to the outer wall of the equipment case 1.
  • the arrestor of this kind of structure in the outside of the equipment case 1, by installing the earthing conductor E in the cutoff area of current Z which is provided in the back-end of the bushing 2, that is, by installing the earthing conductor E between the outer wall of the equipment case 1 and the low-voltage side of the arrestor elements stack 61, it is possible to measure the leakage current of the arrestor elements stack 61 easily.
  • the arrestor of this kind of structure because the back-end (the lower cylindrical section 52) of the bushing 2 which is led outside of the equipment case 1 is formed with the insulated material such as the epoxy resin, and because the molded arrestor elements stack 6 including the arrestor elements stack 61 is installed in the bushing 2, it is possible to provide the cutoff area of current Z between the outer wall of the equipment case 1 and the low-voltage side of the arrestor elements stack 61. And in the outside of the equipment case 1, by installing the earthing conductor E between the outer wall of the equipment case 1 which cuts off the current and the low-voltage side of the arrestor elements stack 61, it is possible to measure the leakage current of the arrestor elements stack 61 easily.
  • the arrestor of this kind of structure it is not necessary to collect or fill insulation gas in the inside of the equipment case 1 while measuring the leakage current, in addition, because it is not necessary to install the insulator in the equipment case 1, the miniaturization, the simplification, the weight-saving, and the cost reduction of the equipment can be attempted.
  • Fig. (a) shows the partial sectional view of the arrestor in the third embodiment of this invention
  • Fig. 5 (b) shows the plane view of the sealing cover in the same embodiment.
  • the same reference numbers are given to the portions which are common to Fig.1, and detailed explanation is omitted.
  • the molded arrestor elements stack 6 provides the arrestor elements stack 61 stacking multiple arrestor elements 61a containing zinc oxide as the main component, and the joint conductor 62 which is installed in the tip side (high-voltage side) of the arrestor elements stack 61, and the columnar pressure metal fitting 64 which is installed in the back-end side (low-voltage side) of the arrestor elements stack 61, and the molded insulator 67d comprising silicone rubber and so on which is molded integrally astride the joint conductor 62 and the pressure metal fitting 64 in the circumference of the arrestor elements stack 61.
  • the gas layer G is provided between the molded insulator 67d and the insertion hole of the bushing 2.
  • the aforementioned molded insulator 67d has enough thickness to integrate the arrestor elements stack 61, the joint conductor 62 and the pressure metal fitting 64, and by thinning the aforementioned thickness as much as possible, in the state of housing the molded arrestor elements stack 6 in the bushing 2, the gas layer G is formed between the molded arrestor elements stack 6 and the insertion hole of the bushing 2 (the tip insertion hole 51a, the intermediate insertion hole 53a, the lower insertion hole 52a) . Furthermore, by providing suchlike molded insulator 67d in the circumference of the arrestor elements stack 61, it is possible to ease the electric field of the outer surface of the arrestor elements stack 61.
  • the molded insulator 67d can be formed by molded body comprising the rubber, the plastic resin of the epoxy resin and so on in place of the molded body comprising the silicone rubber.
  • the reference number 68 shows the plate-shaped sealing cover which is installed in the under surface of the lower cylindrical section 52 of the bushing 2 to close the lower insertion hole 52a, and the aforementioned sealing cover 68 is formed with the metal fitting of the aluminum metal fitting and so on.
  • the circular concave groove section 68a which is almost same shape as the pressure metal fitting 64 is provided in the center of the upper surface of this sealing cover 68, and in the neighborhood of circumference, as shown in Fig.
  • FIG. 5 (b) for example, four bolt insertion holes H3 are provided so that these are placed along the circumference at regular interval. Furthermore, in the under surface side of the lower cylindrical section 52 of the bushing 2, the embedded metal fitting N having tapped holes is embedded in the place corresponding to the bolt insertion holes H3 of the sealing cover 68. Meanwhile, the mark H4 in Fig. 5 (b) shows the bolt insertion hole to insert the earthed electrode terminal.
  • the coiled tip side spring 63 which is almost same diameter as the inner diameter of the cylindrical section 62b of the joint conductor 62 is installed in the cylindrical section 62b of the joint conductor 62 so that the upper section of the tip side spring 63 protrudes, and in this state, the tip (high-voltage side) of the molded arrestor elements stack 6 is inserted in the bushing 2, and the tip of the tip side spring 63 is pushed until it comes in contact with the inner wall surface 43a of the main circuit connection terminal 43.
  • the individual piece (not shown) constituting the electrical contact (multi-contact) which is installed in the annular concave groove 62c of the joint conductor 62 comes in contact with the inner peripheral surface of the joint conductor insertion section 42 electrically, furthermore, the arrestor elements stack 6 is inserted into the insertion hole of the bushing 2 removally.
  • Fig. 6 shows the equipotential distribution figure of the arrestor in this embodiment. From this figure, it is clear that because the tip of the arrestor elements stack 6 is shielded by the high-voltage shielding electrode 4, the electric field does not concentrate to the aforementioned tip, and because the back-end of the arrestor elements stack 6 is installed in the outside of the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned back-end, and furthermore, in the intermediate section of the arrestor elements stack 6, because the electric field is controlled appropriately by adjustment of the interval between the high-voltage shielding electrode 4 and the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned intermediate section.
  • the arrestor of this kind of structure provides the gas layer G between the molded insulator 67d and the insertion hole of the bushing 2.
  • the shock wave which generates when the ground-fault current that greatly exceeds the nominal discharge current flows through the arrestor is released (discharged pressure) from the gap and so on of the sealing section of the bushing 2 through the gas layer G.
  • the O-ring P2 for sealing which is installed between the under surface of the lower cylindrical section 52 of the bushing 2 and the sealing cover 68, and the sealing cover 68 itself transform by momentary rise of internal pressure of the bushing 2 when the breakdown of the arrestor element occurred.
  • the shock wave is released (discharged pressure) from the gap which occurs by aforementioned transformation between the under surface of the lower cylindrical section 52 of the bushing 2 and the sealing cover 68. Therefore, the aforementioned shock wave becomes difficult to propagate to the bushing. Consequently, it is possible to prevent the scattering of the arrestor element.
  • Fig. 7 shows the partial sectional view of the insulation cap which is installed in the bushing removably instead of the aforementioned molded arrestor elements stack 6. Meanwhile, in this figure, the same reference numbers are given to the portions which are common to Fig.1 and Fig. 2 , and detailed explanation is omitted.
  • the insulation cap 20 of this invention provides the insulation cap body 21 which is installed in the tapered insertion hole 53a of the bushing 2, and the cylindrical contact component 22 which is located above the insulation cap body 21 and is installed with the upper cylindrical section 51 concentrically in the upper insertion hole 51a of the bushing 2, and the upper end closing cylindrical pressure component 23 which is located under the insulation cap body 21 and is installed with the lower cylindrical section 52 concentrically in the lower insertion hole 52a of the bushing 2.
  • the contact component 22 is formed by the metal fitting of the aluminum alloy and so on, and that diameter is smaller than the diameter of the upper insertion hole of the bushing, in addition, the length of the axial direction is equal to the interval between the top of inner wall 41b of the high-voltage shielding electrode 4 and the after-mentioned upper wall 27b of the high-voltage side electrode 27.
  • the length of the axial direction of the contact component 22 is the length that the tip of the contact component 22 comes in contact with the top of inner wall 41b of the high-voltage shielding electrode 4 electrically, and back-end of the contact component 22 comes in contact with the upper wall 27b of the high-voltage side electrode 27 electrically.
  • the pressure component 23 is formed by the metal fitting such as the aluminum alloy, and thick wall section 23a is provided along the axial direction in a part of the cylindrical section.
  • the multiple bolt insertion holes 23c are provided in the closed section 23b of the pressure component 23 so that these are placed along the circumference at regular interval and, if necessary, the tapped holes 23d are provided at the back-end surface of the thick wall section 23a.
  • the insulation cap body 21 provides the columnar section 24 which has the almost same outside diameter as the diameter of the lower insertion hole 52a of the bushing 2, and the conically-shaped section 25 which is connected to the tip of the aforementioned columnar section 24 continuously and is installed in the tapered insertion hole 53a of the bushing 2, and the hemispherical low-voltage side electrode 26 which is embedded in the back-end of the columnar section 24 so that the spherical salient 26a turns to the tip, and the hemispherical high-voltage side electrode 27 which is embedded in the tip of the conically-shaped section 25 so that the spherical salient 27a faces to the low-voltage side electrode 26.
  • the outer surface of the conically-shaped section 25 has the tapered outer surface 25a which fits in the tapered inner surface 53b of the bushing 2, and the diameter of the low-voltage side electrode 26 is slightly smaller than the diameter of the columnar section 24. Furthermore, the under surface of the low-voltage side electrode 26 is embedded so as to become the state of the same level surface as the under surface of the columnar section 24, and the multiple spring housing holes 26b and the multiple tapped holes 26c are provided so that these are placed along the circumference at regular interval in the under surface of the aforementioned low-voltage side electrode 26.
  • the columnar section 24 and the conically-shaped section 25 are formed by the insulated material such as the ethylene-propylene rubber, and these are molded integrally together with the low-voltage side electrode 26 and the high-voltage side electrode 27.
  • the spring 28 is set in the spring housing holes 26b of the low-voltage side electrode 26 so that it's lower section protrudes from the spring housing hole 26b, and after that, the bolt 29 is inserted in the bolt insertion holes 23c and it's tip is set in the tapped holes 26c of the low-voltage side electrode 26.
  • the pressure component 23 is installed in the low-voltage side electrode 26 through the axial section 29a of the bolt 29 so as to advance and retreat freely.
  • the contact component 22, the insulation cap body 21 and the pressure component 23 are inserted in the bushing 2, and the tip of the contact component 22 is pushed until it comes in contact with the top section of inner wall 41b of the high-voltage shield.
  • the tapered outer surface 25a of the conically-shaped section 25 of the insulation cap body 21 comes in contact with the tapered inner surface 53b of the bushing 2.
  • the sealing cover F comes in contact with the under surface of the lower cylindrical section 52 of the bushing 2. And the sealing cover F is clenched at under surface of the lower cylindrical section 52 by multiple bolts V2.
  • the surface of the upper-end of the pressure component 23 is pushed until it comes in contact with the surface of the lower-end of the low-voltage side electrode 26 through the axial section 2 9a of the bolt 29, and herewith, the spring 28 is pushed toward axial direction and the spring force of the axial direction is given to the aforementioned spring 28.
  • Fig.8 shows the equipotential distribution figure of the insulation cap in this embodiment. From this figure, by installing the insulation cap 20 at the right position in the bushing 2, because the circumference of the tip of the insulation cap body 21 which constitutes the insulation cap 20 is covered by the high-voltage shielding electrode 4, it is clear that the electric field in the insulation cap body 21 is controlled appropriately.
  • the insulation cap of this kind of structure when the withstand voltage test and so on are performed, by installing the insulation cap 20 which is exchangeable for the molded arrestor elements stack 6 in the insertion hole of the bushing 2, it is possible to ensure the insulation of the inside of the insertion hole of the bushing 2 in the state of removing the molded arrestor elements stack 6.
  • the insulation cap 20 in the inside of the end of the back-end side of the high-voltage shielding electrode 4 that the electric field concentrates, it is possible to control the electric field effectively in the state of installing the insulation cap 20.
  • the insulation of the inside of the insertion hole of the bushing 2 can be ensured by sealing only the inside in the vicinity of the end of the back-end side of the high-voltage shielding electrode 4, the miniaturization of the insulation cap 2 0 can be attempted.
  • Fig. 9 shows the partial sectional view of the arrestor in the fifth embodiment of this invention. Meanwhile, in this figure, the same reference numbers are given to the portions which are common to Fig. 1, and detailed explanation is omitted.
  • the conductive coating layer 75 is provided on the peripheral surface of the tip of the bushing 7 as shown with the dotted line.
  • the bushing 7 in the fifth embodiment provides the intermediate cylindrical section 71 that the circular concave groove section 71a is provided at the neighborhood of circumference of the upper surface of itself, and the upper cylindrical section 72 which is connected to the intermediate cylindrical section 71 concentrically and continuously at the upper end of the intermediate cylindrical section 71 and which has smaller diameter than the outside diameter of the intermediate cylindrical section 71 and which has the dwindled.
  • the conically-shaped section 72a whose upper end is closed
  • the lower cylindrical section 73 which is connected to the intermediate cylindrical section 71 concentrically and continuously at the neighborhood of circumference of the under surface of the intermediate cylindrical section 71 and which has smaller diameter than the outside diameter of the intermediate cylindrical section 71, and the main circuit connection terminal 74 which is embedded in the center of the closed section 72b of the upper cylindrical section 72 so that the tip of itself protrudes from the closed section 72b.
  • the outside diameter of the lower cylindrical section 73 is larger than the diameter of the opened section 1a of the equipment case 1 and the under surface of the circumference of the lower cylindrical section 73 is put on the upper surface of the equipment case 1 and is fixed hermetically.
  • the reference number 75 shows the conductive coating layer (for example, the coating layer comprising silver paint) as the high-voltage shielding electrode. And this conductive coating layer 75 is coated astride the outside circumference surface of the closed section 72b of the upper cylindrical section 72, the outside circumference surface of the conically-shaped section 72a and the outside circumference surface of the semicircular section 71b which constitutes the concave groove section 71a of the intermediate cylindrical section 71.
  • the conductive coating layer for example, the coating layer comprising silver paint
  • Fig. 10 shows the equipotential distribution figure of the arrestor in the fifth embodiment. From this figure, also in this embodiment, as well as the arrestor of the first embodiment, it is clear that because the tip of the arrestor elements stack 61 is shielded by the conductive coating layer 75 as the high-voltage shielding electrode, the electric field does not concentrate to the aforementioned tip, and because the back-end of the arrestor elements stack 61 is installed at the outside of the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned back-end, and furthermore, in the intermediate section of the arrestor elements stack 61, because the electric field is controlled by adjustment of the interval between the conductive coating layer 75 and the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned intermediate section.
  • the arrestor of the fifth embodiment it is possible to equalize the voltage distribution of the arrestor element 61a. And in this embodiment, because the conductive coating layer 75 is provided instead of the high-voltage shielding electrode 4 comprising metal fitting, weight-saving and cost reduction can be attempted than the arrestor in the first embodiment. Meanwhile, the arrestor in this embodiment is suitable for the gas insulated type electric equipment or for the air insulated type electric equipment.
  • Fig. 11 shows the partial sectional view of the arrestor in the sixth embodiment of this invention. Meanwhile, in this figure, the same reference numbers are given to the portions which are common to Fig. 1, and detailed explanation is omitted.
  • the bushing 8 in the sixth embodiment provides the dwindled intermediate cylindrical section 81, and the upper cylindrical section 82 which is connected to the intermediate cylindrical section 81 concentrically and continuously at the upper end of the intermediate cylindrical section 81 and which has smaller diameter than the outside diameter of the intermediate cylindrical section 81, and the lower cylindrical section 83 which is connected to the intermediate cylindrical section 81 concentrically and continuously at the lower end of the intermediate cylindrical section 81 and which has almost same diameter as the outside diameter of the lower end of the intermediate cylindrical section 81.
  • the circular mounting flange 83a is provided continuously at the circumference of the tip of the lower cylindrical section 83.
  • the high-voltage shielding electrode 10 provides the cylindrical metal fitting 11 whose upper end is closed, and the main circuit connection terminal 13 which is installed toward the upper direction from the closed section 12 on the center of the closed section 12 of the metal fitting 11.
  • the main circuit connection terminal 13 is installed on the upper position of the upper cylindrical section 82 and the side wall section 14 of the metal fitting 11 is put on the tip of the upper cylindrical section 82 concentrically so as to be located around the side wall section 82a of the upper cylindrical section 82 and is fixed.
  • Fig. 12 shows the equipotential distribution figure of the arrestor in the sixth embodiment of this invention. From this figure, also in this embodiment, as well as the arrestor of the first embodiment, it is clear that because the tip of the arrestor elements stack 61 is shielded by the cylindrical metal fitting 11 which constitutes the high-voltage shielding electrode 10, the electric field does not concentrate to the aforementioned tip, and because the back-end of the arrestor elements stack 61 is installed in the outside of the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned back-end, and furthermore, in the intermediate section of the arrestor elements stack 61, because the electric field is controlled by adjustment of the interval between the cylindrical metal fitting 11 and the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned intermediate section.
  • the arrestor in this embodiment is suitable for the oil insulated type electric equipment, for the gas insulated type electric equipment or for the air insulated type electric equipment.
  • Fig. 13 shows the partial sectional view of the arrestor in the seventh embodiment of this invention. Meanwhile, in this figure, the same reference numbers are given to the portions which are common to Fig. 1 and Fig. 11, and detailed explanation is omitted.
  • the high-voltage shielding electrode 10 which is shown in Fig. 11 is put on the tip of the bushing 9 and is fixed, and the circumference of the high-voltage shielding electrode 10 is covered by the insulation barrier 91b as follows.
  • the bushing 9 in the seventh embodiment provides the upper cylindrical section 91 that the circular concave groove section 91a is provided at the neighborhood of circumference of the upper surface of itself, and the lower cylindrical section 92 which is connected to the upper cylindrical section 91 concentrically and continuously at the lower end of the upper cylindrical section 91 and which has smaller diameter than the outside diameter of the upper cylindrical section 91.
  • the high-voltage shielding electrode 10 of the same structure shown in Fig. 11 that side wall section 14 is installed concentrically so as to be located in the concave groove section 91a of the upper cylindrical section 91.
  • the outside diameter of the upper cylindrical section 91 is larger than the diameter of the opened section 1a of the equipment case 1 and the under surface of the circumference of the upper cylindrical section 91 is put on the inner surface of the equipment case 1 and is fixed hermetically.
  • Fig. 14 shows the equipotential distribution figure of the arrestor in the seventh embodiment. From this figure, also in this embodiment, as well as the arrestor of the first embodiment, it is clear that because the tip of the arrestor elements stack 61 is shielded by the cylindrical metal fitting 11 as the high-voltage shielding electrode, the electric field does not concentrate to the aforementioned tip, and because the back-end of the arrestor elements stack 61 is installed at the outside of the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned back-end, and furthermore, in the intermediate section of the arrestor elements stack 61, because the electric field is controlled by adjustment of the interval between the cylindrical metal fitting 11 and the equipment case 1 as the earthed electrode, the electric field does not also concentrate to the aforementioned intermediate section.
  • the arrestor of the seventh embodiment it is possible to equalize the voltage distribution of the arrestor element 61a as a whole. And in the arrestor of this embodiment, by installing the side wall section 14 of the high-voltage shielding electrode 10 in the concave groove section 91a of the upper cylindrical section 91, because the insulation barrier component 91b is located around the cylindrical metal fitting 11, it is possible to shorten the insulating distance between phases or the insulating distance with equipment case 1, and consequently, the miniaturization of the equipment can be attempted. Meanwhile, the arrestor in this embodiment is suitable for the oil insulated type electric equipment, for the gas insulated type electric equipment or for the air insulated type electric equipment.
  • Fig. 15 shows the partial sectional view of the arrestor in the eighth embodiment of this invention. Meanwhile, in this figure, the same reference numbers are given to the portions which are common to Fig.1 and Fig.2, and detailed explanation is omitted.
  • the high-voltage shielding electrode 20 is embedded in the tip of the molded arrestor elements stack 6 as follows.
  • the joint conductor insertion section 42 shown in Fig.1 is embedded in the center of the closed section 51b of the upper cylindrical section 51, and the main circuit connection terminal 43 shown in Fig.1 is provided continuously on the tip of the joint conductor insertion section 42.
  • the tapered hole 31 which extends conically toward the lower end section from the closed section 51b is provided in the inner circumference of the upper cylindrical section 51, and this tapered hole 31 is leading to the intermediate insertion hole 32 which is the same diameter as the lower insertion hole 52a shown in Fig.1 continuously.
  • the high-voltage shielding electrode 20 provides the plate-shaped horizontal section 21a, and the reverse-cup-like shielding body 21 which has the side wall section 21b which is provided vertically so as to extend conically from the circumference of the horizontal section 21. And the cylindrical section 62b shown in Fig. 2 is installed at the center of the upper section of the horizontal section 21a of this shielding body 21 so that it protrudes .
  • the horizontal section 21a comes in contact with the tip side (high-voltage side) of the arrestor elements stack 61, and in this state, it is integrated by the molded rubber 67 which is provided at the circumference of the arrestor elements stack 61. Meanwhile, the conical section 67d which comes in contact with the inner circumference surface of the tapered hole 31 is provided at the circumference of the tip of the molded rubber 67.
  • the high-voltage shielding electrode 20 is embedded in the molded rubber 67

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Gas-Insulated Switchgears (AREA)
EP05814184.7A 2004-12-10 2005-12-08 Ableiter und verfahren zur messung des leckstroms eines ableiters Withdrawn EP1821320A4 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2004357915A JP4460432B2 (ja) 2004-12-10 2004-12-10 アレスタ
JP2004357916A JP2006165436A (ja) 2004-12-10 2004-12-10 アレスタ
JP2004357914A JP4460431B2 (ja) 2004-12-10 2004-12-10 アレスタ
JP2004357913A JP2006166671A (ja) 2004-12-10 2004-12-10 アレスタおよびアレスタの漏れ電流の測定方法
JP2005351596A JP2007158041A (ja) 2005-12-06 2005-12-06 アレスタ
PCT/JP2005/022578 WO2006062168A1 (ja) 2004-12-10 2005-12-08 アレスタおよびアレスタの漏れ電流の測定方法

Publications (2)

Publication Number Publication Date
EP1821320A1 true EP1821320A1 (de) 2007-08-22
EP1821320A4 EP1821320A4 (de) 2013-06-19

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EP (1) EP1821320A4 (de)
KR (1) KR100929906B1 (de)
CN (1) CN101116156B (de)
TW (1) TW200632949A (de)
WO (1) WO2006062168A1 (de)

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Publication number Priority date Publication date Assignee Title
WO2013159871A1 (de) * 2012-04-24 2013-10-31 Pfisterer Kontaktsysteme Gmbh Vorrichtung zum ableiten einer elektrischen überspannung
EP2696206A1 (de) * 2012-08-06 2014-02-12 ABB Technology AG Mittel- oder Hochspannungsanordnung mit Kabelverbindungsendgerät
EP1993177A4 (de) * 2006-03-08 2016-01-20 Fuji Electric Co Ltd Blitzableiter

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Publication number Priority date Publication date Assignee Title
CN104133161A (zh) * 2013-05-24 2014-11-05 国家电网公司 避雷器电试验工装
CN104007310B (zh) * 2014-06-06 2016-08-17 太原理工大学 一种氧化锌避雷器泄漏电流检测方法
CN114596993A (zh) * 2022-03-02 2022-06-07 富通集团有限公司 一种防雷光电线缆

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US4161012A (en) * 1977-03-02 1979-07-10 Joslyn Mfg. And Supply Co. High voltage protection apparatus
EP0259731A2 (de) * 1986-09-09 1988-03-16 Kabushiki Kaisha Toshiba Überspannungsableiter
FR2629263A1 (fr) * 1988-03-25 1989-09-29 Transfix Soc Nouv Dispositif de protection pour appareil electrique a moyenne tension

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Cited By (6)

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EP1993177A4 (de) * 2006-03-08 2016-01-20 Fuji Electric Co Ltd Blitzableiter
WO2013159871A1 (de) * 2012-04-24 2013-10-31 Pfisterer Kontaktsysteme Gmbh Vorrichtung zum ableiten einer elektrischen überspannung
US9209607B2 (en) 2012-04-24 2015-12-08 Pfisterer Kontaktsysteme Gbmh Device for discharging an electrical overvoltage
EP2696206A1 (de) * 2012-08-06 2014-02-12 ABB Technology AG Mittel- oder Hochspannungsanordnung mit Kabelverbindungsendgerät
WO2014023402A1 (en) * 2012-08-06 2014-02-13 Abb Technology Ag Medium or high voltage arrangement with cable connection terminal
US9689898B2 (en) 2012-08-06 2017-06-27 Abb Schweiz Ag Medium or high voltage arrangement with cable connection terminal

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Publication number Publication date
WO2006062168A1 (ja) 2006-06-15
EP1821320A4 (de) 2013-06-19
KR100929906B1 (ko) 2009-12-04
TWI378475B (de) 2012-12-01
CN101116156A (zh) 2008-01-30
TW200632949A (en) 2006-09-16
CN101116156B (zh) 2012-03-28
KR20070088686A (ko) 2007-08-29

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