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EP3144942A1 - Dispositif de protection contre les surtensions - Google Patents

Dispositif de protection contre les surtensions Download PDF

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Publication number
EP3144942A1
EP3144942A1 EP15185825.5A EP15185825A EP3144942A1 EP 3144942 A1 EP3144942 A1 EP 3144942A1 EP 15185825 A EP15185825 A EP 15185825A EP 3144942 A1 EP3144942 A1 EP 3144942A1
Authority
EP
European Patent Office
Prior art keywords
thread
surge arrester
pressure screw
fitting body
end fittings
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.)
Granted
Application number
EP15185825.5A
Other languages
German (de)
English (en)
Other versions
EP3144942B1 (fr
Inventor
Bastian Robben
Alexander Bockarev
Markus Sulitze
Henrik Roggow
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
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP15185825.5A priority Critical patent/EP3144942B1/fr
Priority to CN201610811525.2A priority patent/CN106952701B/zh
Priority to US15/268,780 priority patent/US10504639B2/en
Publication of EP3144942A1 publication Critical patent/EP3144942A1/fr
Application granted granted Critical
Publication of EP3144942B1 publication Critical patent/EP3144942B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01C1/01—Mounting; Supporting

Definitions

  • the invention relates to surge arresters, as they are used to protect against surges in electrical energy transmission networks.
  • a surge arrester is on the one hand connected electrically to a high or medium voltage transmission line, on the other hand to ground potential.
  • the surge arrester acts like an isolator.
  • the surge arrester When an overvoltage occurs due to, for example, lightning strikes or switching operations, the surge arrester becomes conductive and conducts the overvoltage to earth. If the overvoltage has subsided, the surge arrester is again insulating.
  • the surge arrester has a discharge column with a voltage-dependent electrical resistance, a so-called varistor. Below a threshold voltage, which is a material property of the varistor, the rejection column is high-impedance and acts as an insulator. When the threshold voltage is exceeded, the resistance of the varistor decreases, the rejection column becomes conductive and conducts the overvoltage to earth.
  • a rejection column of a surge arrester is often constructed as a cylindrical column of stacked individual varistor blocks.
  • the varistor blocks are in turn cylindrical, usually circular cylindrical, blocks of a voltage-dependent material such as zinc oxide or silicon carbide. These are stacked with their faces to each other to Ableit yarn.
  • the diverter column In order to ensure that the diverter column is mechanically stable on the one hand and that the varistor blocks have good electrical contact with one another on the other hand, the diverter column must be held together under pressure. Basically, there are two different types of construction.
  • the rejection column is arranged in a mechanically stable housing and clamped between flanges of the housing.
  • the rejection column is surrounded by a cage made of tension elements, for example of glass fiber reinforced plastic, which are braced in end fittings and thus hold together the Ableit yarn.
  • the surge arrester has an outer jacket made of a weatherproof material, such as silicone.
  • the invention relates to a surge arrester in the cage design, regardless of whether this is additionally arranged in a mechanically stable housing.
  • the WO 2006/125753 A1 shows such a surge arrester.
  • the end fittings, in which the tension elements are clamped, have a continuous axial bore with a thread.
  • a pressure screw is screwed, which exerts an axial pressure on the Ableit yarn.
  • an externally accessible connecting bolt which serves for the electrical connection, is screwed into this bore. Both require to transmit the necessary forces a screwed in the thread minimum length. This essentially determines the thickness of the end fitting. Efforts to make the end fitting more compact to reduce the overall length of the surge arrester are hampered by the minimum required length.
  • the object of the invention is to provide a surge arrester with compact end fittings.
  • a surge arrester has a discharge column extending along a longitudinal axis, which is formed from a plurality of stacked varistor blocks.
  • the Ableit yarn is clamped by a plurality of these radially surrounding and fixed in Endarmaturen tension elements between the end fittings.
  • At least one of the end fittings has a first thread for attachment of a connecting bolt.
  • the connecting bolt is used to connect the surge arrester to an overhead line of an energy transmission network.
  • the end fitting has a fitting body with a second thread for receiving a pressure screw for generating an axial force on the Ableit yarn.
  • the delivery column is compressed axially in order to allow the best possible contact between the Varistorblöcken forming the Ableit yarn.
  • the first thread and the second thread are arranged relative to one another such that they overlap along an axial section, that is to say a section extending parallel to the longitudinal axis.
  • the first and second threads are thus arranged parallel to one another and parallel to the longitudinal axis such that a radial plane oriented perpendicularly to the longitudinal axis, which lies within this axial section, intersects both the first thread and the second thread.
  • the first and second threads are coaxial with each other and arranged with respect to the longitudinal axis. This facilitates the manufacture and assembly.
  • the first thread is an internal thread arranged in the fitting body.
  • First and second threads are coaxial with each other and arranged to the longitudinal axis.
  • the pressure screw is pot-shaped and screwed into the second thread.
  • the pressure screw has a bottom facing the Ableit yarnle and a extending from this and the Ableit yarnle away sidewall.
  • Floor and side wall enclose a hollow interior.
  • the fitting body has an annular axial recess which extends in the axial direction from the inner, ie pointing to the Ableit yarn end of the first thread to the outside, ie away from the Ableit yarn.
  • the second thread extends into the axial recess. It can be arranged on the outer or inner wall of the recess.
  • the bottom has a tool holder for receiving a screwing tool.
  • the tool holder may for example be a hexagonal hole for receiving an Allen key.
  • a tool can be inserted through the bore of the first thread to rotate from the outside of the pressure screw and thus to tension the Ableit yarn.
  • the pressure screw has one or more injection openings, which serve to inject potting compound into the hollow interior.
  • each injection opening extends from the bottom to the side wall of the pressure screw.
  • the second thread is an internal thread and the pressure screw has a corresponding external thread on its side wall.
  • the pressure screw has a cylindrical outer circumferential surface with a thread corresponding to the second thread.
  • the fitting body is designed like a ring with a cylindrical inner circumferential surface, wherein the second thread is arranged on the inner circumferential surface.
  • the pressure screw has a cylindrical outer circumferential surface with a second thread corresponding thread on.
  • the valve body is held while the pressure screw is rotated by a tool.
  • the pressure screw can be held and the two opposite fitting body together with the Ableit yarn and the tension elements are rotated together.
  • the first and second threads are designed as left-hand threads and at the opposite end fittings as right-hand threads. This allows both end fittings to be tensioned evenly in one operation.
  • the first thread in the fitting body is arranged, wherein at a radial distance around the first thread a plurality of second threads are arranged distributed around the first thread around,
  • a pressure screw is arranged in each second thread.
  • the tension of the delivery column takes place outside of the longitudinal axis in several places, which can be a better pressure distribution on the Ableit yarn reach.
  • the FIG. 1 shows a conventional surge arrester 1 in the so-called cage design with a consisting of several varistor elements Ableit yarn 2.
  • the Ableit yarn 2 may contain other elements such as metal blocks (not shown) for length compensation.
  • the Ableit yarn 2 is held at both ends by end fittings 30.
  • end fittings 30 By a protruding from the end fitting 30 connecting bolt 15 of the surge arrester 1 can be integrated into the power supply system.
  • tension elements 4 are clamped in the end fittings 30 around the outside of the discharge column and parallel to the longitudinal axis 40 of the surge arrester, which hold the discharge column 2 under tension.
  • These tension elements 4 are designed as rods made of glass fiber reinforced plastic.
  • the surge arrester is often provided with an outer sheath 31 made of silicone. On the outside of the enclosure 31 screens 32 are provided to increase the creepage distance of the current.
  • FIG. 2 shows an end fitting 30, as in one in the FIG. 1 shown surge arrester is used.
  • the end fitting arranged at the opposite end of the surge arrester (no reference symbol is not visible there) is constructed similarly to this end fitting.
  • Traction elements 4 clamped. These can be screwed, wedged or crimped in the end fitting 30.
  • the end fittings 30 have a through hole 6. This points in contrast to WO 2006/125753 A1 here sections 12 and 13 with different width.
  • the first portion 12 has a first thread 7, the second portion 13 a second thread 8.
  • As a thread screw threads are understood in the context of the invention, which are arranged as an internal thread on an inner circumferential surface of a circular cylindrical bore or as an external thread on a circular cylindrical outer surface.
  • the first section 12 with the first thread 7 and the second section 13 with the second thread 8 are arranged coaxially one behind the other.
  • a connecting bolt 15 is screwed into the first thread 7 in the first section 12.
  • a pressure screw 14 is screwed into the second thread 8.
  • the pressure screw 14 is screwed from the inside of the end fitting 30 and screwed after assembly of the Varistorblöcken 5 Ableit yarn 2 and the tension elements 4 through the central bore 6 by means of a tool in the axial direction to the Ableit yarn 2 out.
  • a force is exerted on the delivery column 2, which is absorbed by the tension elements 4.
  • a thrust washer 11 can be arranged between the pressure screw 14 and the outermost varistor block 5 of the diverter column 2. After tensioning the delivery column 2, the connecting bolt 15 can be screwed into the first thread 7 of the central bore 6.
  • Both the first thread 7, and the second thread 8 need a certain minimum length L1 and L2, since the connecting bolt 15 and pressure screw 14 each require a certain screwing depth in order to remove the forces occurring on the flange can.
  • the second thread 8 must also have enough leeway so that the pressure screw 14 can be rotated sufficiently far out of the second thread 8, in order to transmit the necessary compressive force to the Ableitkla 2.
  • the necessary minimum length L1, L2 the thread 7, 8 determines the minimum height of the end fitting 30 and limited efforts to make this more compact.
  • FIG. 3 shows a first embodiment of an end fitting 3 according to the invention, which allows a more compact design. It is compared to the end fitting 30 of FIG. 2 the central bore 6 of the valve body 10 in the region of the second portion 13 in diameter greatly increased. Instead of a massive pressure screw 14, this is pot-shaped, with a hollow circular cylindrical side wall 20 and a circular bottom 21, which closes the side wall 20 frontally. The bottom 21 abuts the discharge column 2, the side wall 20 extends away from the bottom 21 of the discharge column 2. In the region of the side wall 20, the fitting body 10 has a ring-shaped axial recess 23 directed away from the delivery column 2 into which the side wall 20 of the pressure screw 14 is inserted. The second thread 8 extends into this recess 23 inside.
  • the first section 12 with the first thread 7 and the second section 13 with the second thread 8 thus overlap in an axial section 9.
  • the first and second threads 7, 8 are thus arranged parallel to each other and parallel to the longitudinal axis 40, that radial , So perpendicular to the longitudinal axis aligned plane that lies within this axial portion 9, both the first thread 7, and the second thread 8 intersects.
  • the fitting body 10 and thus the end fitting 3 can be shortened in height by the length of the portion 9.
  • the pressure screw 14 has a tool holder 16 here in the form of a hexagon socket. In this can be used by the central bore 6 from the outside a tool to rotate the pressure screw 14 and to press against the Ablesitklale 2 to produce the necessary compressive force.
  • the bottom 21 could also have a receptacle for a socket wrench on its side opposite the discharge column 2.
  • the floor 21 may also include one or more injection openings 17 that extend into the side wall 20. Through these injection openings 17, casting compound, for example silicone, can enter into the interior 22 of the pressure screw 14 during the casting of the outer envelope 31 and thus seal off the central bore 6. A hitherto conventional sealing from the outside of the end fitting 3 can thus be omitted.
  • casting compound for example silicone
  • the fitting body 10 is designed like a ring. It has a cylindrical inner circumferential surface, on which the second thread 8 is arranged.
  • the pressure screw 14 has a cylindrical outer circumferential surface with a corresponding thread. In the preferred embodiment shown here penetrates the pressure screw 14 the valve body 10 completely.
  • the first thread 7 is arranged in the pressure screw 14, preferably as shown here, coaxial with the second thread 8. The first thread extends over a first portion 12, the second via a second portion 13. The two portions 12, 13 overlap in the axial section 9.
  • the Figures 5 and 6 show a third embodiment of the invention in different perspectives.
  • the first thread 7 is arranged in the fitting body 10.
  • To the center of the first thread 7 are distributed in a radial distance a plurality of second thread 8 in the fitting body 10 are arranged in a circle.
  • a pressure screw 14 is arranged, which is pressed in a tensioned state against the Ableitkla 2 and against the pressure plate 11.
  • the first thread 7 extends over the first section 12 and the second thread 8 via the axial section 13.
  • the first section 12 and the second section 13 overlap.
  • the pressure screws 14 are preferably threaded pins , also called grub screws executed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP15185825.5A 2015-09-18 2015-09-18 Dispositif de protection contre les surtensions Active EP3144942B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15185825.5A EP3144942B1 (fr) 2015-09-18 2015-09-18 Dispositif de protection contre les surtensions
CN201610811525.2A CN106952701B (zh) 2015-09-18 2016-09-08 过电压防护放电器
US15/268,780 US10504639B2 (en) 2015-09-18 2016-09-19 Overvoltage arrester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15185825.5A EP3144942B1 (fr) 2015-09-18 2015-09-18 Dispositif de protection contre les surtensions

Publications (2)

Publication Number Publication Date
EP3144942A1 true EP3144942A1 (fr) 2017-03-22
EP3144942B1 EP3144942B1 (fr) 2018-02-21

Family

ID=54151142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15185825.5A Active EP3144942B1 (fr) 2015-09-18 2015-09-18 Dispositif de protection contre les surtensions

Country Status (3)

Country Link
US (1) US10504639B2 (fr)
EP (1) EP3144942B1 (fr)
CN (1) CN106952701B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3232448A1 (fr) * 2016-04-13 2017-10-18 Siemens Aktiengesellschaft Dispositif de protection contre les surtensions

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109215908B (zh) * 2017-06-30 2021-08-20 河南平高通用电气有限公司 一种避雷器及其芯体和芯体上压盖
CN110660545B (zh) * 2019-08-08 2022-07-05 河南平高电气股份有限公司 一种罐式避雷器用压装芯体的压盖及罐式避雷器
USD1019339S1 (en) * 2021-12-29 2024-03-26 The Trustees for the Time Being of the Live Line International Trust Support arrangement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726581A2 (fr) * 1995-02-11 1996-08-14 ABB Management AG Procédé de fabrication d'un isolateur
US6008975A (en) * 1997-03-03 1999-12-28 Mcgraw-Edison Company Self-compressive surge arrester module and method of making same
WO2006125753A1 (fr) 2005-05-25 2006-11-30 Tridelta Überspannungsableiter Gmbh Coupe-circuit de surtension a cage
DE102009008463A1 (de) * 2009-02-09 2010-08-12 Siemens Aktiengesellschaft Überspannungsableiteranordnung
DE102009035646A1 (de) * 2009-07-29 2011-02-10 Siemens Aktiengesellschaft Endarmatur für einen Überspannungsableiter und Verfahren zur Herstellung eines Überspannungsableiters
WO2012098250A1 (fr) * 2011-01-21 2012-07-26 Tridelta Überspannungsableiter Gmbh Limiteur de tension à configuration en cage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504075C2 (sv) 1994-08-29 1996-11-04 Asea Brown Boveri Ventilavledare
DE19622140A1 (de) * 1996-06-01 1997-12-04 Asea Brown Boveri Überspannungsableiter
DE19650579A1 (de) 1996-12-06 1998-06-10 Asea Brown Boveri Überspannungsableiter
DE19813135A1 (de) * 1998-03-25 1999-09-30 Asea Brown Boveri Überspannungsableiter
DE19940939C1 (de) 1999-08-23 2001-07-19 Siemens Ag Überspannungsableiter mit einem Verspannelement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726581A2 (fr) * 1995-02-11 1996-08-14 ABB Management AG Procédé de fabrication d'un isolateur
US6008975A (en) * 1997-03-03 1999-12-28 Mcgraw-Edison Company Self-compressive surge arrester module and method of making same
WO2006125753A1 (fr) 2005-05-25 2006-11-30 Tridelta Überspannungsableiter Gmbh Coupe-circuit de surtension a cage
DE102009008463A1 (de) * 2009-02-09 2010-08-12 Siemens Aktiengesellschaft Überspannungsableiteranordnung
DE102009035646A1 (de) * 2009-07-29 2011-02-10 Siemens Aktiengesellschaft Endarmatur für einen Überspannungsableiter und Verfahren zur Herstellung eines Überspannungsableiters
WO2012098250A1 (fr) * 2011-01-21 2012-07-26 Tridelta Überspannungsableiter Gmbh Limiteur de tension à configuration en cage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3232448A1 (fr) * 2016-04-13 2017-10-18 Siemens Aktiengesellschaft Dispositif de protection contre les surtensions
US10043603B2 (en) 2016-04-13 2018-08-07 Siemens Aktiengesellschaft Surge arrester

Also Published As

Publication number Publication date
US20170084367A1 (en) 2017-03-23
US10504639B2 (en) 2019-12-10
CN106952701A (zh) 2017-07-14
EP3144942B1 (fr) 2018-02-21
CN106952701B (zh) 2020-01-24

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