EP3057109A1 - Protection contre les surtensions - Google Patents

Protection contre les surtensions Download PDF

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Publication number
EP3057109A1
EP3057109A1 EP15154862.5A EP15154862A EP3057109A1 EP 3057109 A1 EP3057109 A1 EP 3057109A1 EP 15154862 A EP15154862 A EP 15154862A EP 3057109 A1 EP3057109 A1 EP 3057109A1
Authority
EP
European Patent Office
Prior art keywords
contact
electrical connection
column
contact surface
resistance elements
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Withdrawn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
EP15154862.5A
Other languages
German (de)
English (en)
Inventor
Daniel Flohe
Andre Fricke
Erhard Pippert
Dirk Sagasser
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP15154862.5A priority Critical patent/EP3057109A1/fr
Priority to CN201610083050.XA priority patent/CN105895282A/zh
Priority to US15/042,373 priority patent/US20160240289A1/en
Publication of EP3057109A1 publication Critical patent/EP3057109A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors

Definitions

  • the invention relates to a surge arrester according to the preamble of patent claim 1.
  • Surge arresters are protective systems, for example for power transmission networks, which in case of overvoltages caused by lightning strikes or malfunctions of other subsystems dissipate these overvoltages to ground and thus protect other components of the power transmission system.
  • Such a surge arrester comprises one or more cylindrical discharge columns of resistive elements, which are often constructed of individual, likewise cylindrical varistor elements.
  • Varistors are characterized by a voltage-dependent resistor. At low voltages these act as insulators. From a certain threshold voltage, which is material-dependent, they show a good conductivity. Frequently, varistors are made from metal oxides such as zinc oxide.
  • the discharge column is connected at both ends with end fittings, which establish the electrical connection to the power line and to ground. In order to ensure good electrical contact even under mechanical stress, the delivery column must be held together under pressure.
  • tension members such as ropes or rods are preferably made of glass fiber reinforced plastic, clamped in the end fittings or arranged at the ends of the Ableit yarn pressure plates under train.
  • the tension elements surround the Ableit yarn and thus form a cage around this.
  • the dissipation column is arranged in a mechanically stable tubular housing made of an insulating material, for example made of porcelain or glass fiber reinforced plastic.
  • the end fittings can then simultaneously serve as closures for this case.
  • Such surge often have a pressure relief device.
  • FIG. 1 such a surge arrester shown.
  • a column of resistance elements is arranged in a tubular housing.
  • the resistive elements consist of individual cylindrical varistor elements which are stacked to the column. As a result, the individual resistance elements are electrically connected in series.
  • WO 94/14171 A1 such a surge arrester.
  • the resistance elements of each column are also connected electrically in series here. However, the columns are electrically connected in parallel with each other. As a result, an increased energy absorption capacity or a reduction of the residual stress is achieved.
  • Object of the present invention is to provide a compact surge arrester with a high energy absorption capacity.
  • a surge arrester in which a column of stacked resistance elements extends between a first and a second electrical connection.
  • the resistance elements are generally cylindrical, often circular cylindrical, blocks of a material with a voltage-dependent resistor, so-called varistor elements.
  • varistor elements As a material often comes a metal oxide, such as zinc oxide, for use.
  • a resistance element has at least one varistor element and, in addition to this, may contain further elements, such as, for example, spacer elements made of a material with good electrical conductivity, such as steel or aluminum. Only one, some or all of the resistance elements of the column can have such spacers.
  • the resistance elements are stacked along a column longitudinal axis with their end faces to each other to the column.
  • the end faces serve as opposing first and second contact surfaces of the resistance element.
  • the resistance elements are stacked in the column such that the first contact surface of each resistance element faces the first electrical connection and the second contact surface with the second electrical connection.
  • the first contact surface of a resistive element adjoins the second contact surface of a resistor element adjacent to the latter in the pillar. This may mean that the first contact surface of the one resistance element is applied to the second of the adjacent resistance element, but also that between the two contact surfaces, a connecting element made of a highly electrically conductive material is arranged.
  • the first contact surface of the one resistive element and the second contact surface of the adjacent resistive element are in direct electrical contact with each other, so are directly connected to each other or at best via a good electrical conductor, but not via active or passive electrical components such as resistors, coils, Semiconductor devices or the like.
  • a contact surface of the two lying in the column at the outer ends of the resistance elements form the outer end faces of the column. Between these two outer faces of the column there is an electrical connection through the column.
  • end fittings can be arranged, which serve as electrical connections.
  • tension elements can be clamped in the end fittings, which hold the column together.
  • the end fittings are usually made of a highly electrically conductive material.
  • the tension elements however, made of an electrically insulating material such as glass fiber reinforced plastic.
  • the column has at least two groups of resistance elements.
  • the resistance elements of the first group are each directly connected to the first electrical connection with their first contact surface and with their second contact surface to the second electrical connection.
  • the resistance elements of the second group are each directly connected to their first contact surface with the second electrical connection and with their second contact surface with the first electrical connection.
  • Directly connected to the connection here means that the connection is made via a good electrical conductor, for example made of copper, steel or aluminum, and in the current path between the respective contact surface and the relevant electrical connection no active or passive electrical components such as resistors, Coils, semiconductor devices or the like are connected.
  • the electrical connection can be made for example by means of cables.
  • the electrical connection can be carried out either outside the column by the contact of two adjacent contact surfaces out of the column by means of a connecting element between two resistor elements. Outside the column, the connecting elements can be connected by common means such as cables. The electrical connection can also take place within the column. This would require a through hole going through each resistive element. Within the bore then run the respective contact surfaces interconnecting conductors.
  • the individual resistance elements are connected in parallel between the first and the second electrical connection. If the column consists of n resistive elements, then the equivalent circuit is a parallel circuit of n resistive elements. The current flowing through this circuit is thus, if component tolerances are disregarded, n times a single column.
  • resistance elements of the first group and resistance elements of the second group alternate in the column.
  • each contact surface of the first and second groups of resistance elements connected to the first electrical connection adjoins one another.
  • the contact surfaces connected to the second electrical connection If, for example, one picks out any resistance element of the first group within the column, then this is in the preferred alternating arrangement between two resistance elements of the second group.
  • the first contact surface of the resistance elements of the first group adjoins a second contact surface of a resistance element of the second group.
  • both contact surfaces can be connected to the first electrical connection in a particularly simple manner. For example, by a connecting element arranged between the two contact surfaces leads the electrical connection to the outside of the column and is connected there to the first electrical connection.
  • this resistance element of the first group adjoins a first contact surface of a resistance element of the second group.
  • the connection of these two contact surfaces to the second electrical connection can be produced equivalently as above.
  • first and second contact disks are arranged in the column between adjacent resistance elements. Between two together adjacent contact surfaces of two resistive elements is thus arranged in each case a contact disc, which is either a first or a second contact disc.
  • a first contact disk is arranged between a first contact surface of a resistive element of the first group and the second contact surface of a resistive element of the second group and a second contact disk between the second contact surface of a resistive element of the first group and the first contact surface of a resistive element of the second group.
  • Both first and second contact discs are thus between each two resistance elements and electrically connect the two adjacent contact surfaces.
  • the contact discs are good electrical conductors and preferably made of aluminum or steel.
  • an electrical connection extending through the pillar exists from the first contact surface of the first resistive element to the second contact surface of the last resistive element of the pillar.
  • All contact discs have a contact lug lying outside the pillar.
  • the contact lugs of the first contact discs are electrically connected to each other, the contact lugs of the second contact discs are also electrically connected to each other.
  • the electrical connection to two contact surfaces lead to the outside of the column and connect there in a particularly simple manner.
  • the contact lugs of the first contact discs and the contact lugs of the second contact discs are aligned with each other.
  • the contact lugs of the first contact discs are characterized on a first contact axis parallel to the arrester longitudinal axis of the surge arrester.
  • the contact lugs of the second contact discs are also on a second contact axis parallel to the Ableiterlteilsachse.
  • the first and second contact axes have a minimum distance, so they are not congruent.
  • the contact lugs of the first group are connected to each other by means of a connecting conductor.
  • the contact lugs of the second contact discs are interconnected by means of another connecting conductor. This makes it possible to achieve a particularly simple and space-saving connection of the resistance elements.
  • connection conductor can be, for example, each a cable that is connected to the contact lugs with commercially available cable clamps.
  • a further exemplary embodiment of a connecting conductor is in each case a threaded rod made of metal, which is passed through holes in the contact lugs and connected by means of nuts with the contact lugs.
  • a threaded rod would connect all the contact lugs of the first contact discs together, and a second threaded rod all contact lugs of the second contact discs.
  • first and the second contact disc are congruent to each other.
  • the first and second contact discs are then arranged rotated against each other in the column, so that the contact lugs of the first and second contact discs are superimposed on different axes.
  • the same parts can be used for first and second contact discs, which is logistically advantageous.
  • At least two mutually parallel columns extend between the first electrical connection and the second electrical connection.
  • a contact disk extending over all the columns and electrically connecting them to one another is arranged between each resistance element. If a large number of resistance elements is needed, they can be distributed over several columns and thus arranged in a particularly space-saving manner.
  • the column more preferably but several columns, arranged in a tubular fluid-tight sealed housing with a first and second fitting body.
  • the first fitting body is connected to the first electrical connection and the second fitting body is connected to the second electrical connection.
  • the housing may have a tubular jacket made of a non-conductive material such as porcelain or glass fiber reinforced plastic.
  • the fitting body made of metal can serve as flanges, which close the housing and the electrical connection to the resistor elements on the one hand and a component to be protected on the other hand, produce.
  • the housing can also be a pressure-resistant metal housing.
  • the fitting bodies would be bushings which lead an electrical connection of the resistance elements electrically insulated from the housing to the outside.
  • the column or in the case of several columns each of the columns, has an odd number of resistance elements.
  • This allows a particularly simple electrical connection of the fitting body, since then one of the outermost contact surfaces with the first electrical connection, the other is connected to the second electrical connection.
  • FIGS. 1 to 3 different embodiments of a surge arrester 1 according to the invention are shown schematically. These figures are intended to explain mainly the electrical interconnection of the individual elements. The physical arrangement of the individual elements is shown only schematically.
  • the FIG. 1 shows a surge arrester 1. Between a first electrical connection 2 and a second electrical connection 3 extends a column 4 of seven resistive elements 20. The number seven is chosen arbitrarily.
  • the invention relates to surge arresters 1 having at least two resistive elements 20. A preferred embodiment is a column with an odd number of resistive elements, but the invention is not limited to these.
  • the resistance elements 20 are cylindrical, preferably circular cylindrical. The end faces of a resistance element 20 form a first and second contact surface 7, 8.
  • the resistance elements 20 are arranged in the column, that the first contact surfaces 7 of all resistance elements 20 to the first electrical connection 2 and the second contact surfaces 8 of all resistance elements 20 to the second electrical Connection 3. At each point, where two resistance elements adjoin one another, borders a first contact surface 7 of a resistance element 20 to a second contact surface 8 of an adjacent resistance element 20.
  • the first and second electrical connection 2, 3 may be, for example, end fittings that define the column 4 on both sides.
  • the resistance elements 20 are arranged in two groups, a first group 5 and a second group 6.
  • the resistance elements 20 designated I belong to the first group 5, those designated II to the second group 6. Also in the following figures This is so, even if the reference numerals 5 and 6 have been omitted for reasons of clarity.
  • the resistance elements 20 of the first group 5 are all directly connected with their first contact surfaces 7 with the first electrical connection 2 and with their second contact surfaces 8 with the second electrical connection 3.
  • the direct connection is an electrical connection that consists of a good electrical conductor such as copper, steel, aluminum or other electrically conductive metals or carbon fibers.
  • FIG. 2 shows a surge arrester 1, in which two columns 4, each with seven resistance elements 20 between the first and second electrical connection 2, 3 are arranged. At each point, at the two resistance elements 20 adjoin each other, the columns 4 are interconnected.
  • FIG. 3 shows a surge arrester 1 with four columns 4, each with seven resistor elements 20. Here are all columns 4 at each point, at the two resistor elements 20 adjacent to each other, connected together.
  • FIG. 4 shows a general equivalent circuit diagram with n resistive elements 20, which are all connected in parallel between the first electrical terminal 2 and the second electrical terminal 3.
  • n 7
  • All versions have in common is that all resistance elements 20 of the respective Surge arrester 1 are connected in parallel between the first electrical connection 2 and the second electrical connection 3.
  • each of the n resistive elements 20 provides its own independent current path, the current through which it passes is multiplied by n resistor elements connected in parallel, neglecting component tolerances, then exactly n times the resistive elements interconnected by a column of n in series , so that the energy absorption capacity increases accordingly.
  • FIG. 5 shows a surge arrester 1 with seven resistance elements, which are arranged between the first electrical connection 2 and the second electrical connection 3 in a column 4.
  • the resistance elements 20 are aligned so that all the first contact surfaces 7 point to the first electrical connection 2 and all the second contact surfaces to the second electrical connection 3.
  • FIG. 6 shows the same surge arrester 1, in which case the column 4 between two resistance elements 20 is shown exploded. In both cases, seven resistive elements 20 are stacked in a column.
  • the resistance elements 20 of the first group 5 are again denoted by I here, those of the second group by II. In the illustrated embodiment, resistance elements 20 of the first group 5 and those of the second group 6 alternate. Since the column 4 is constructed here from an odd number of resistance elements 20, the column 4 is delimited at both ends by resistance elements 20 of the first group 5.
  • end fittings 26 are arranged, which simultaneously serve as electrical connections 2, 3.
  • the end fittings may have connecting elements, not shown here, by means of which they can be connected to an electrical system. For example, in the FIGS.
  • upper end fitting 26 with a high voltage terminal and the lower end fitting 26 are connected to the ground terminal of an electrical system.
  • the first electric Terminal 2 is then connected to high voltage, the second electrical connection 3 to the earth.
  • the end fittings 26 are made of a good electrically conductive material such as a metal and make the electrical connection between the column 4 and the electrical system ago.
  • first and second contact disks 9, 10 are alternately arranged between each two resistance elements 20.
  • a contact disc 9 visible visible.
  • the contact discs 10 look similar, but are arranged rotated by 180 ° about the column longitudinal axis 30 of the column 4.
  • the contact discs 9, 10 are here circular discs. The shape substantially corresponds to the cross section of the resistance elements 20.
  • a contact lug 11, 12 is arranged. This protrudes from the lateral surface of the column 4.
  • Each contact disk 9, 10 is arranged between a first and a second contact surface 7, 8, two resistance elements 20 and establishes the electrical contact between these two contact surfaces 7, 8.
  • the first contact discs 9 are arranged so that their contact lugs 11 are aligned with each other, so are on a first alignment axis 31 parallel to the column longitudinal axis 30.
  • the second contact discs 10 are arranged so that their contact lugs 12 are aligned with each other on a second alignment axis 32.
  • the first and second alignment axis 31, 32 are in the present example on opposite sides, based on the column longitudinal axis 30. This is not absolutely necessary. Instead, the axes of flight 31, 32 can also be next to each other, provided that the necessary isolation distance is maintained.
  • the respective aligned contact lugs 11, 12 are electrically connected to each other outside the column 4. All the contact lugs 11 of the first contact discs 9 are connected to each other and to the first electrical connection 2.
  • All contact lugs 12 of the second contact discs 10 are connected to each other and to the second electrical connection 3.
  • the in the FIGS. 5 and 6 illustrated surge arrester 1 can be arranged in a housing which is not shown here.
  • FIG. 7 shows a surge arrester 1 with two parallel columns 4, each with seven resistance elements 20.
  • the column longitudinal axes 30 are parallel to each other and the arrester longitudinal axis 33.
  • Each column 4 is arranged between two end fittings 26.
  • the two end fittings lying at the upper end of the columns 4 together form the first electrical connection 2, the two end fittings 26 located at the lower end of the columns 4 the second electrical connection 3.
  • the arrangement and alignment of the resistance elements 20 of both columns 4 is the same as in FIGS FIGS. 5 and 6 .
  • first and second contact discs 9, 10 are also arranged here. These each extend over both columns 4 and electrically connect them to one another. Unlike the FIGS.
  • FIG. 8 Such a contact disk 9 is shown.
  • the contact disk 10 is congruent with this.
  • the contact discs 9, 10 consist of two circular discs, which are interconnected by a connecting web 28.
  • a contact lug 11, 12 is arranged, which protrudes from the lateral surface of the column 4.
  • FIG. 8 Several possible positions and shapes of contact lugs 11, 12 are shown.
  • a particularly space-saving variant is a contact lug 11 in the vicinity of the connecting web 28, ie in the gusset between the two columns 4.
  • the contact lugs 11, 12 may have holes 29 or slots 27, into which a connecting conductor 13, 14th for introducing the electrical connection is introduced.
  • This connecting conductor 13, 14 may be, for example, a cable or a rod made of metal.
  • FIG. 9 shows a sectional view of a surge arrester 1, in which four columns 4, each with seven resistor elements between the first electrical terminal 2 and the second electrical terminal 3 are arranged.
  • the columns 4 are arranged in a housing 19.
  • the housing 19 may, as shown here, be made of a housing tube 21 made of an electrically insulating material such as glass-fiber reinforced plastic or porcelain and have an outer shell, for example silicone, for protection from weather conditions on the outside. Often, the outer shell screens 22 to Kriechwegverinrung on.
  • the housing 19 is closed fluid-tight by means of a first and second fitting body 15, 16 at its ends.
  • the fitting body 15, 16 are made of an electrically conductive material such as metal and offer on the one hand within the housing 19 a connection to the columns 4 and on the other hand outside of the housing 19 a connection to an electrical system.
  • the columns 4 are arranged between a tension plate 24 and an end fitting 26, which simultaneously serves as a second electrical connection 3. Between the tension plate 24 and the end fitting 26 tensioned tension elements 23 hold the columns 4 together.
  • the tension plate 24 may be made of an electrically insulating material such as glass fiber reinforced plastic or of an electrically conductive material such as metal. In the first case, the tension plate has holes through which the electrical connection to the columns 4 is made.
  • Each column 4 has seven resistance elements 20, which are each composed here of a varistor element 35 and a spacer element 36.
  • the spacers 36 are electrically good conductive body made of metal and serve on the one hand the easier assembly of the connecting conductors 13, 14 and on the other hand, the adaptation of the column length to the housing size. In addition, the spacers 36 increase the surface area of the resistive elements 20, thereby better cooling them.
  • Each resistance element 20 has at least one varistor element 35, some or all of the resistance elements 20 may have spacer elements 36.
  • At the end of each column patches 17 are arranged, which serve the length compensation. They are also made of metal and connect the resistance elements with the first and second electrical connection 2, 3.
  • first electrical connection 2 are here metal cylinder, which are arranged between the first fitting body 15 and the columns 4 and the electrical connection between these, optionally through pull plate 24 through.
  • the second electrical connection 3 is provided by the end fitting 26 which is electrically connected and fixed to the second fitting body 16 as a cross-shaped plate made of metal.
  • FIG. 10 shows a further illustration of the surge arrester 1 from FIG. 9 ,
  • the inner structure of the columns 4 is shown by an additional section.
  • a first or second contact disc 9, 10 is arranged between each resistance element 20, between each resistance element 20, a first or second contact disc 9, 10 is arranged.
  • Each of the contact discs 9, 10 consists of four, for each column 4, a circular discs, which are connected to each other with connecting webs 28 in a square.
  • the contact discs 9, 10 thus connect the columns 4 electrically to each other.
  • the contact discs 9, 10 have contact lugs 11, 12 in the form of tongues.
  • An additional contact disc 9, 10, is disposed between the outermost resistance element 20 and a filler 17.
  • All contact lugs 11 of the first contact discs 9 are aligned with each other and are connected to each other by means of a connecting conductor 13, which is shown here in the form of a threaded rod.
  • all the contact lugs 12 of the second contact discs 10 are aligned with each other and are connected to each other by means of a connecting conductor 14, also in the form of a threaded rod.
  • the connecting conductors 13, 14 are guided through holes 29 of the contact lugs 11, 12 and secured by nuts 25 thereto.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
EP15154862.5A 2015-02-12 2015-02-12 Protection contre les surtensions Withdrawn EP3057109A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15154862.5A EP3057109A1 (fr) 2015-02-12 2015-02-12 Protection contre les surtensions
CN201610083050.XA CN105895282A (zh) 2015-02-12 2016-02-06 避雷器
US15/042,373 US20160240289A1 (en) 2015-02-12 2016-02-12 Overvoltage arrester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15154862.5A EP3057109A1 (fr) 2015-02-12 2015-02-12 Protection contre les surtensions

Publications (1)

Publication Number Publication Date
EP3057109A1 true EP3057109A1 (fr) 2016-08-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15154862.5A Withdrawn EP3057109A1 (fr) 2015-02-12 2015-02-12 Protection contre les surtensions

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US (1) US20160240289A1 (fr)
EP (1) EP3057109A1 (fr)
CN (1) CN105895282A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD811333S1 (en) * 2016-01-12 2018-02-27 M & I Materials Limited Varistor unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6464301A (en) * 1987-09-04 1989-03-10 Hitachi Ltd Overvoltage suppressor
WO1994014171A1 (fr) 1992-12-08 1994-06-23 Siemens Aktiengesellschaft Dispositif de protection contre les surtensions comportant une resistance en oxyde metallique
JP2005294459A (ja) * 2004-03-31 2005-10-20 Otowa Denki Kogyo Kk アレスタ装置
JP2009164361A (ja) * 2008-01-08 2009-07-23 Japan Ae Power Systems Corp 避雷器
EP2757565A1 (fr) 2013-01-18 2014-07-23 Siemens Aktiengesellschaft Flasque pour boîtier rigide pour l'isolation électrique d'un composant électrique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115705U (ja) * 1984-07-02 1986-01-29 株式会社明電舎 避雷器
CA1334990C (fr) * 1988-03-31 1995-03-28 John D. Sakich Appareils electriques modulaires avec dispositif de decompression
JPH0236245A (ja) * 1988-07-27 1990-02-06 Hiroyoshi Hata ノリとチョークの粉を混ぜて練ったゴム状物質
US5043838A (en) * 1989-03-31 1991-08-27 Hubbell Incorporated Modular electrical assemblies with pressure relief
CN2199581Y (zh) * 1994-04-20 1995-05-31 卡斯柯信号有限公司 过压保护器及装有它的电源防雷组合
CN2575816Y (zh) * 2002-10-10 2003-09-24 中国电力科学研究院 用于实现降低避雷器高度的串接电阻片单元结构
CN204332571U (zh) * 2014-12-27 2015-05-13 陕西鑫盾科技有限公司 光伏发电专用无间隙金属氧化物避雷器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6464301A (en) * 1987-09-04 1989-03-10 Hitachi Ltd Overvoltage suppressor
WO1994014171A1 (fr) 1992-12-08 1994-06-23 Siemens Aktiengesellschaft Dispositif de protection contre les surtensions comportant une resistance en oxyde metallique
JP2005294459A (ja) * 2004-03-31 2005-10-20 Otowa Denki Kogyo Kk アレスタ装置
JP2009164361A (ja) * 2008-01-08 2009-07-23 Japan Ae Power Systems Corp 避雷器
EP2757565A1 (fr) 2013-01-18 2014-07-23 Siemens Aktiengesellschaft Flasque pour boîtier rigide pour l'isolation électrique d'un composant électrique

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US20160240289A1 (en) 2016-08-18
CN105895282A (zh) 2016-08-24

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