WO2002043217A1 - Agencement servant a reduire les surtensions au moyen de plusieurs varistors - Google Patents

Agencement servant a reduire les surtensions au moyen de plusieurs varistors Download PDF

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Publication number
WO2002043217A1
WO2002043217A1 PCT/DE2001/004279 DE0104279W WO0243217A1 WO 2002043217 A1 WO2002043217 A1 WO 2002043217A1 DE 0104279 W DE0104279 W DE 0104279W WO 0243217 A1 WO0243217 A1 WO 0243217A1
Authority
WO
WIPO (PCT)
Prior art keywords
varistors
varistor
individual
ptc thermistor
current
Prior art date
Application number
PCT/DE2001/004279
Other languages
German (de)
English (en)
Inventor
Volker Hinrichsen
Kai Steinfeld
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to DE10195114T priority Critical patent/DE10195114D2/de
Priority to AU2002216916A priority patent/AU2002216916A1/en
Publication of WO2002043217A1 publication Critical patent/WO2002043217A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/16—Resistor networks not otherwise provided for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Definitions

  • the invention relates to an arrangement for reducing overvoltages with a plurality of varistors, which are electrically connected in parallel for the joint discharge of a leakage current.
  • Such an arrangement is known, for example, from the article "At home at -50 ° C", Renz, Hinrichsen, EV Report 1/95, Siemens AG, pages 10 to 13.
  • the article describes a series compensation system with a capacitor bank for the compensation of inductive impedances of a transmission line.
  • a plurality of surge arresters are connected in parallel with the capacitor bank.
  • These surge arresters are varistors, the leakage current path of which essentially consists of metal oxide.
  • the parallel connection of several varistors is necessary in order to discharge the high leakage currents to be controlled without overloading the individual varistors.
  • the present invention is therefore based on the object of designing an arrangement for reducing overvoltages with a plurality of varistors in such a way that overloading of individual varistors is avoided in a wide working range.
  • a thermistor element which controls the distribution of the leakage current to the individual varistors is electrically connected in series to at least one of the varistors.
  • the cold resistance of the PTC thermistor element is selected such that the UI characteristic of the varistor is only slightly influenced within its working range.
  • the hot resistance of the PTC thermistor element is adjusted in such a way that when a critical temperature at the PTC thermistor element that jeopardizes the varistor is reached, the voltage drop is so high that the varistor connected in series with the PTC thermistor element is effectively relieved of this voltage and due to the nonlinear voltage UI characteristic the current and power consumption in this varistor decreases sharply.
  • the varistors connected in parallel take on the proportion of the current by which the current through the affected varistor is reduced. In a simple case, for example, two varistors can be connected in parallel, a thermistor element being electrically connected in series with one of the varistors.
  • the varistor provided with the PTC thermistor element is the less powerful of the two connected in parallel
  • the PTC element controls depending on the varistor te temperature the leakage current distribution so that the more powerful varistor carries an increased leakage current component
  • a further advantageous embodiment of the invention provides that the varistor is formed from several layered blocks and at least one of these blocks is a PTC thermistor element.
  • the varistor is formed from several layered blocks, the series connection of the varistor with a PTC element is possible in a structurally very simple manner.
  • the PTC thermistor element is designed as a discrete element and is arranged between the layered blocks of the varistor.
  • the PTC thermistor element forms a structural unit with the varistor.
  • the PTC thermistor element forms a structural unit with the varistor, this results in favorable properties for mounting the varistor. Due to the structural unity, the stor forcibly connected to the PTC thermistor element, so that there are favorable conditions for contacting the varistor and PTC thermistor element.
  • a structural unit can be applied, for example, to a cold-conducting layer on the varistor, for example, by a sintering process.
  • the structural unit results in a large number of possible forms of the combination of PTC element and varistor.
  • FIG. 1 schematically shows a capacitor bank and varistors of a series compensator connected in parallel thereto
  • FIG. 2 shows a schematic construction of a varistor with PTC thermistor elements
  • FIG. 3 shows a further construction of a varistor with PTC thermistor elements.
  • FIG. 1 shows a capacitor bank 1 consisting of a plurality of capacitors 2, 3, 4, 5 connected in parallel and an arrester bank 6 connected in parallel to the capacitor bank 1.
  • Both the capacitor bank 1 and the arrester bank 6 are part of a series compensator, which in the course of an over - Support line is arranged to compensate for inductive impedances. As such, the series compensator is traversed by the current I flowing in the transmission line. In the case of a three-phase transmission line, such a compensation system is provided in each of the phases.
  • the arrester bank 6 consists of a plurality of varistors 7, 8, 9, 10 connected in parallel. Such varistors 7, 8, 9, 10 are also referred to as arresters. In each of the parallel flow paths of the arrester bank 6, a PTC element 11, 12, 13, 14 is connected in series with each of the varistors 7, 8, 9, 10.
  • the operating current I of the transmission line flows through the capacitor bank 6.
  • the capacitor bank 1 partially compensates for the inductive reactive power of the transmission lines.
  • the voltage drop across the capacitor bank 1 is only so great that the variable interference 7, 8, 9, 10 have a very high impedance and only a small leakage current flows through them.
  • the short-circuit energy must be kept away from the capacitor bank 1 in order to protect it from damage.
  • the voltage drop across capacitor bank 1 is such that the impedance of varistors 7, 8, 9, 10 drops sharply in accordance with their UI characteristic and most of the short-circuit current through the parallel current paths of the arrester bank 6 flows. Due to the manufacturing tolerances of the varistors 7, 8, 9, 10, the UI characteristics of the individual varistors 7, 8, 9, 10 vary with one another, so that the impedances of the individual varistors 7, 8, 9, 10 of the arrester bank 6 differ are great.
  • both the varistors 7, 8, 9, 10 and the PTC thermistor elements 11, 12, 13, 14 are at approximately the same temperature.
  • both the varistors 7, 8, 9, 10 and the PTC thermistor elements 11, 12, 13, 14 are heated due to the deviations of the impedances of the varistors 7, 8, 9, 10, individual varistors 7, 8, 9, 10 can already operate at their power limit.
  • the PTC element heats up so strongly that its impedance increases so that the PTC element 11, 12, 13, 14 such a high voltage drop occurs that the varistor 7, 8, 9, 10 is effectively relieved of voltage and due to its non-linear characteristic, the current and thus the power consumption of the affected varistor 7, 8, 9, 10 decrease.
  • the leakage current is now distributed over the individual parallel current paths of the arrester bank 6 in accordance with the impedances that arise.
  • the varistor has several metal oxide blocks 15, 16, 17. These metal oxide blocks 15, 16, 17 are an integral part of the leakage current path of a varistor.
  • the PTC thermistor element is also designed as a discrete block. In order to achieve a precise mapping of the temperature of the metal oxide blocks, the PTC thermistor element is divided into two blocks in this exemplary embodiment.
  • the PTC thermistor blocks 18, 19 are each arranged between two metal oxide blocks 15, 16, 17.
  • a cold-conducting layer 23, 24, 25 is applied to the individual metal oxide blocks 20, 21, 22.
  • the cold-conducting layer 23, 24, 25 and the respective metal oxide block 20, 21, 22 are connected to one another in an electrically conductive manner.
  • Such a connection can be produced, for example, by a sintering, an adhesive process or another joining technique.
  • the metal oxide blocks 20, 21, 22 with the PTC layer 23, 24, 25 are in turn stacked on one another and thus form an essential part of the leakage current path of a varistor.

Landscapes

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

Abstract

Plusieurs varistors (7, 8, 9, 10) sont montés électriquement en parallèle pour répartir un courant de décharge sur plusieurs d'entre eux (7, 8, 9, 10). En raison de tolérances de fabrication, les caractéristiques UI des varistors individuels (7, 8, 9, 10) divergent. Le courant de décharge se répartit de manière non uniforme sur les varistors individuels (7, 8, 9, 10) et sollicite ces derniers (7, 8, 9, 10) plus ou moins fortement, jusqu'à une surcharge des varistors individuels (7, 8, 9, 10). Pour réguler la répartition du courant de décharge sur les varistors individuels (7, 8, 9, 10) un posistor (11, 12, 13, 14) est monté électriquement en série avec au moins un des varistors (7, 8, 9, 10).
PCT/DE2001/004279 2000-11-21 2001-11-14 Agencement servant a reduire les surtensions au moyen de plusieurs varistors WO2002043217A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10195114T DE10195114D2 (de) 2000-11-21 2001-11-14 Anordnung zum Abbau von Überspannungen mit mehreren Varistoren
AU2002216916A AU2002216916A1 (en) 2000-11-21 2001-11-14 System for reducing excess voltages, comprising a plurality of varistors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000158908 DE10058908C1 (de) 2000-11-21 2000-11-21 Anordnung zum Abbau von Überspannungen mit mehreren Varistoren
DE10058908.1 2000-11-21

Publications (1)

Publication Number Publication Date
WO2002043217A1 true WO2002043217A1 (fr) 2002-05-30

Family

ID=7664881

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/004279 WO2002043217A1 (fr) 2000-11-21 2001-11-14 Agencement servant a reduire les surtensions au moyen de plusieurs varistors

Country Status (3)

Country Link
AU (1) AU2002216916A1 (fr)
DE (2) DE10058908C1 (fr)
WO (1) WO2002043217A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012140033A1 (fr) * 2011-04-12 2012-10-18 Phoenix Contact Gmbh & Co. Kg Dispositif de coupure à deux étages
FR2986380A1 (fr) * 2012-01-31 2013-08-02 Citel Dispositif de protection de ligne electrique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271446A (en) * 1977-06-27 1981-06-02 Comstock Wilford K Transient voltage suppression system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142523A1 (de) * 1991-12-21 1993-06-24 Asea Brown Boveri Widerstand mit ptc - verhalten
DE19612841A1 (de) * 1996-03-30 1997-10-02 Abb Research Ltd Strombegrenzender Widerstand mit PTC-Verhalten

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271446A (en) * 1977-06-27 1981-06-02 Comstock Wilford K Transient voltage suppression system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEE G E ET AL: "BPA'S PACIFIC AC INTERTIE SERIES CAPACITORS: EXPERIENCE, EQUIPMENT & PROTECTION", IEEE TRANSACTIONS ON POWER DELIVERY, IEEE INC. NEW YORK, US, vol. 11, no. 1, 1996, pages 253 - 259, XP000554201, ISSN: 0885-8977 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012140033A1 (fr) * 2011-04-12 2012-10-18 Phoenix Contact Gmbh & Co. Kg Dispositif de coupure à deux étages
CN103460541A (zh) * 2011-04-12 2013-12-18 菲尼克斯电气公司 两级断路装置
DE102011001977C5 (de) * 2011-04-12 2015-12-03 Phoenix Contact Gmbh & Co. Kg Zweistufige Abschaltvorrichtung für einen Varistor
EP2697881B1 (fr) 2011-04-12 2016-11-30 Phoenix Contact GmbH & Co. KG Dispositif de coupure à deux étages
FR2986380A1 (fr) * 2012-01-31 2013-08-02 Citel Dispositif de protection de ligne electrique

Also Published As

Publication number Publication date
DE10058908C1 (de) 2002-08-08
DE10195114D2 (de) 2003-11-20
AU2002216916A1 (en) 2002-06-03

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