EP0521805B1 - Indicateur de défaut pour un parafoudre - Google Patents

Indicateur de défaut pour un parafoudre Download PDF

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Publication number
EP0521805B1
EP0521805B1 EP92420228A EP92420228A EP0521805B1 EP 0521805 B1 EP0521805 B1 EP 0521805B1 EP 92420228 A EP92420228 A EP 92420228A EP 92420228 A EP92420228 A EP 92420228A EP 0521805 B1 EP0521805 B1 EP 0521805B1
Authority
EP
European Patent Office
Prior art keywords
resistor
arrester
indicator
current
lightning
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.)
Expired - Lifetime
Application number
EP92420228A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0521805A1 (fr
Inventor
Christian Gazzola
Joel Gauchon
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.)
Ferraz SA
Original Assignee
Ferraz SA
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 Ferraz SA filed Critical Ferraz SA
Publication of EP0521805A1 publication Critical patent/EP0521805A1/fr
Application granted granted Critical
Publication of EP0521805B1 publication Critical patent/EP0521805B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/12—Means structurally associated with spark gap for recording operation thereof
    • 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 fault or short-circuit indicating devices, intended to equip lightning arresters mounted along high or medium voltage overhead electrical lines.
  • Such a device comprises an elastically deformable rectilinear strip, one of the ends of which, associated with a lock, is released when a defect appears in the arrester associated with said device.
  • the means for releasing the lock are dependent on a filter formed by two windings in parallel, one of which is of the inductive type in order to stop the current resulting from the shock waves at very high di / dt, while the another is resistive in nature in order to slow down the passage of a possible "short circuit" current which can pass through the inductive winding in series with a fusible wire, the melting of which has the effect of releasing the indicator.
  • Such an indicator is of low sensitivity, because it does not work below 70 amps.
  • the filter system requires an inductance value which is difficult to achieve industrially and at low cost.
  • the principle of selecting currents by the di / dt relationship has the drawback of allowing currents of significant peak value to pass through the wire in the event of lightning waves. The duration of the lightning wave is not sufficient to destroy the wire, but premature aging of the metal may appear if the lightning phenomenon recurs.
  • the improvements which are the subject of the present invention aim to remedy these drawbacks and to allow the production of a surge arrester fault indicator which is actuated as a function of the intensity value of the current generated by the network after switching on. short circuit of the arrester.
  • the fault indicator according to the invention is defined in claim 1.
  • this indicator comprises two opposite electrodes which are joined on the one hand in series by a device with nonlinear voltage-current characteristic such as a spark gap or a low voltage varistor through which any lightning waves pass, and on the other hand in derivation by a resistor which does not react during a lightning wave, but rises in temperature during the passage of the current generated by the network to destroy at least partially a sleeve surrounding the indicator, in the event of accidental short-circuiting of the arrester connected in series with this indicator.
  • a device with nonlinear voltage-current characteristic such as a spark gap or a low voltage varistor through which any lightning waves pass
  • the rise in temperature of the resistor can destroy it and cause the elimination of an elastic band, the ends of which are associated with said resistor.
  • Fig. 1 is a longitudinal section of a fault indicator established in accordance with the invention.
  • Fig. 2 is a section along II-II (fig. 1).
  • Fig. 3 shows the electrical diagram of the fault indicator according to the invention.
  • Fig. 4 is a detailed perspective view of an alternative embodiment of the invention.
  • a first embodiment of the fault indicator according to the invention which essentially comprises two electrodes 1 and 2, provided cylindrical, and between which a low voltage varistor 3 is inserted, two intermediate washers 4 ensuring a good contact between said electrodes and the varistor.
  • the assembly of the three aforementioned elements is carried out by means of a tube 5 of insulating material having a vertical slot, so that it affects in cross section the shape of an inverted C (fig. 2).
  • the tube 5 is associated with the electrodes 1 and 2 by means of shims 6.
  • a resistor 7 is connected by conductors 8 and 9, respectively to the electrodes 1 and 2, said resistor being located in the slit 5a of the tube 5. All the aforementioned elements is placed in a mold for molding an outer shell 10 produced for example by means of a silicone elastomer for example. It is observed that the resistor 7 tangents one of the external generators of the envelope 10 for reasons which will be explained better below.
  • a tubular sleeve 11 made of elastomer and which is put in place by elastic elongation.
  • the sleeve 11 is preferably colored.
  • the electrode 1 is connected by any suitable means, for example by a conductor 12 (fig. 3) to a surge arrester 13, while the electrode 2 is connected to earth by a cable 14 (fig. 3).
  • the operation is as follows: during a lightning strike, the intensity peak is led to the ground by crossing the varistor 3, the current deflected in the resistor 7 does not cause a significant heating of the latter due to the very short duration of the lightning strike.
  • the arrester 13 is destroyed, a current is generated by the network, and is maintained until the intervention of the network protections.
  • the resulting duration causes heating of the resistor sufficient to melt the sleeve 11 at its level given the proximity of the resistor and the sleeve.
  • the sleeve is made in the form of a strip 11 ′ which does not occupy the entire periphery of the envelope 10, so that between its ends there is a space 15.
  • Each of the ends of the strip 11 ′ Is provided with a metal terminal 11 ′ a , 11 ′ b to each of which is fixed the corresponding end of the resistor 7 which thus constitutes a means for retaining in place the interrupted strip 11 ′.
  • Terminals 11 ′ a and 11 ′ b are respectively joined to conductors 8 and 9.
  • a fault indicator has thus been produced which responds particularly well to the wishes of the practice and which allows in particular, owing to the current / voltage characteristics of the two components in parallel, that practically all of the leakage current of the arrester 13 passes through the resistor 7, so that the varistor 3 does not age in normal operation.
  • the rise in temperature of the resistor 7 can act on a remote signaling circuit facilitating the finding of destruction of the fault indicator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Insulators (AREA)
EP92420228A 1991-07-03 1992-07-02 Indicateur de défaut pour un parafoudre Expired - Lifetime EP0521805B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9108563 1991-07-03
FR9108563A FR2678764A1 (fr) 1991-07-03 1991-07-03 Indicateur de defaut pour un parafoudre.
CH03708/92A CH687486A5 (fr) 1991-07-03 1992-12-03 Indicateur de défaut pour un parafoudre.
PT101114A PT101114B (pt) 1991-07-03 1992-12-07 Indicador de defeito para para-raios
CS923807A CZ282376B6 (cs) 1991-07-03 1992-12-21 Indikátor závad bleskojistky

Publications (2)

Publication Number Publication Date
EP0521805A1 EP0521805A1 (fr) 1993-01-07
EP0521805B1 true EP0521805B1 (fr) 1994-12-28

Family

ID=27428667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92420228A Expired - Lifetime EP0521805B1 (fr) 1991-07-03 1992-07-02 Indicateur de défaut pour un parafoudre

Country Status (7)

Country Link
EP (1) EP0521805B1 (OSRAM)
CH (1) CH687486A5 (OSRAM)
CZ (1) CZ282376B6 (OSRAM)
DE (1) DE69201021T2 (OSRAM)
ES (1) ES2066589T3 (OSRAM)
FR (1) FR2678764A1 (OSRAM)
PT (1) PT101114B (OSRAM)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29613325U1 (de) * 1996-08-01 1996-09-26 Siemens AG, 80333 München Überspannungsableiter
US10319545B2 (en) 2016-11-30 2019-06-11 Iskra Za{hacek over (s)}{hacek over (c)}ite d.o.o. Surge protective device modules and DIN rail device systems including same
US10447026B2 (en) 2016-12-23 2019-10-15 Ripd Ip Development Ltd Devices for active overvoltage protection
US10340110B2 (en) 2017-05-12 2019-07-02 Raycap IP Development Ltd Surge protective device modules including integral thermal disconnect mechanisms and methods including same
US10685767B2 (en) 2017-09-14 2020-06-16 Raycap IP Development Ltd Surge protective device modules and systems including same
US11223200B2 (en) 2018-07-26 2022-01-11 Ripd Ip Development Ltd Surge protective devices, circuits, modules and systems including same
US11862967B2 (en) 2021-09-13 2024-01-02 Raycap, S.A. Surge protective device assembly modules
US11723145B2 (en) 2021-09-20 2023-08-08 Raycap IP Development Ltd PCB-mountable surge protective device modules and SPD circuit systems and methods including same
US11990745B2 (en) 2022-01-12 2024-05-21 Raycap IP Development Ltd Methods and systems for remote monitoring of surge protective devices
US12199412B2 (en) 2022-06-02 2025-01-14 Ripd Ip Development Ltd. Surge protective devices, circuits, modules and systems including same
US12206234B2 (en) 2022-09-20 2025-01-21 Ripd Ip Development Ltd Overvoltage protection device modules
US12437906B2 (en) 2022-10-18 2025-10-07 Raycap, S.A. Surge protective devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603418B1 (fr) * 1986-08-28 1988-11-10 Ferraz Indicateur pour la signalisation de la mise en court-circuit d'un parafoudre
FR2641423B1 (fr) * 1988-12-30 1991-05-24 Ferraz Dispositif parafoudre pour la protection des lignes electriques
FR2652457B1 (fr) * 1989-09-22 1993-12-24 Simel Ste Indle Materiel Electr Dispositif parafoudre a indicateur visuel de defaut.

Also Published As

Publication number Publication date
PT101114A (pt) 1994-07-29
FR2678764B1 (OSRAM) 1995-02-10
DE69201021D1 (de) 1995-02-09
FR2678764A1 (fr) 1993-01-08
PT101114B (pt) 1999-09-30
DE69201021T2 (de) 1995-05-24
CZ380792A3 (en) 1994-07-13
EP0521805A1 (fr) 1993-01-07
ES2066589T3 (es) 1995-03-01
CZ282376B6 (cs) 1997-07-16
CH687486A5 (fr) 1996-12-13

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