WO2018055547A1 - Parasurtenseur et assemblage fusible - Google Patents

Parasurtenseur et assemblage fusible Download PDF

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Publication number
WO2018055547A1
WO2018055547A1 PCT/IB2017/055730 IB2017055730W WO2018055547A1 WO 2018055547 A1 WO2018055547 A1 WO 2018055547A1 IB 2017055730 W IB2017055730 W IB 2017055730W WO 2018055547 A1 WO2018055547 A1 WO 2018055547A1
Authority
WO
WIPO (PCT)
Prior art keywords
surge arrestor
surge
dropout
earth
contacts
Prior art date
Application number
PCT/IB2017/055730
Other languages
English (en)
Inventor
Anton Van Heerden
Original Assignee
Anton Van Heerden
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 Anton Van Heerden filed Critical Anton Van Heerden
Publication of WO2018055547A1 publication Critical patent/WO2018055547A1/fr
Priority to ZA2019/02185A priority Critical patent/ZA201902185B/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/02—Details
    • H01H31/12—Adaptation for built-in fuse
    • H01H31/122—Fuses mounted on, or constituting the movable contact parts of, the switch
    • H01H31/127—Drop-out fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/44—Structural association with a spark-gap arrester
    • 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
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/08—Overvoltage arresters using spark gaps structurally associated with protected apparatus

Definitions

  • This invention relates to a surge arrestor and fuse assembly suitable for providing surge protection to transformers within an electrical distribution network especially, but not exclusively, pole mounted surge arrestor and fuse assemblies. More particularly, the invention relates to a dropout surge arrestor assembly that embodies an expulsion fuse forming a part of the surge arrestor in addition to a fuse holder.
  • the assembly may be used in conjunction with a conventional drop-out fuse co-operating with upper and lower hardware to enable the drop out action in the case of a conventional fuse or a double sequential dropout fuse action in the case of a fuse assembly such as is described in international patent publication WO 2015/040541 entitled DROPOUT FUSE ASSEMBLY AND FUSE HOLDER. BACKGROUND TO THE INVENTION
  • Surge arrestors are used extensively in high voltage electrical networks, such as at distribution points, to discharge currents associated with over voltage surges within the network line length to afford voltage damping and reduce a high voltage spike effect on both insulation and plant.
  • Surge protection is particularly used to protect transformers, cables and line equipment.
  • a surge arrestor is installed in the supply line to a consumer to prevent or at least minimize damage to the consumer's equipment by allowing a discharge of the over voltage to earth and thereby avoid to a large extent consequential fires; and also avoid possible bodily harm or even electrocution of personnel.
  • a surge arrester is thus connected to ground and functions by routing energy from an over-voltage transient to ground if one occurs, while isolating the conductor from ground at normal operating voltages.
  • the surge arrestor is of the metal oxide, in particular zinc oxide, a voltage dependent resistor type (varistor) that can become faulty if subjected to an excessive severity of surge or number of surges in which instance the normally high resistance of the arrestor to normal voltages becomes diminished and the input terminal of the surge arrestor may become effectively grounded.
  • the purpose of the expulsion device is to disconnect the surge arrestor under such conditions.
  • a surge arrestor can fail as a result of supply follow through current.
  • a surge arrestor is designed to be disconnected by an expulsion device comprising an explosive powder to forcefully and automatically disconnect a failed surge arrestor from the network to prevent a direct short circuit to earth, which would result in a lengthy network fault finding outage.
  • a failed surge arrestor needs to be replaced and, because it does not interrupt the power supply, it may go unnoticed and only be replaced during a periodic maintenance check that is frequently only conducted annually.
  • the identification of a blown surge arrestor is solely dependent on visual inspection. In the intervening period a transformer and possibly other equipment would therefore be exposed to damage that may be caused by surges, for example to transients occasioned by lightning strikes that would otherwise be damped by the surge arrestor.
  • replacement of a surge arrestor often requires the electrical supply network to be isolated during replacement with accompanying inconvenience to all affected consumers. Newer versions of surge arrestors may have a dropout characteristic that makes them more identifiable should anyone look at them and some of them have an advantage in that they allow for live line replacement, with the use of elongate tools.
  • Blown surge arrestors of the dropout type are also more easily identifiable although due to the size and length of a network, these too may remain disconnected for extended periods. In any event, during this intervening time the line may be subjected to excessive voltage spikes, due to an absence of active surge protection.
  • a modification comprises an additional bus-bar which is extended over the live side of the surge arrestor, incorporating the same female contact receptor as is used for a standard drop out expulsion fuse and the male part of the connector is added to the connecting end of the surge arrestor.
  • the design has the advantage of a single unit incorporating a surge arrestor and expulsion fuse, both of which can be identified easily and replaced under live conditions.
  • a combination surge arrestor and dropout fuse assembly comprising an electrically conductive supply bus-bar carried by a first insulator part supported on a mounting base wherein the bus-bar supplies an electrically conductive supply contact to supply an operatively upper cooperating releasable terminal of a dropout fuse holder carried at its opposite end by an articulated contact assembly supported by a second insulator part that is also carried by a mounting base, the bus-bar also having at least two electrically conductive surge arrestor contacts for cooperation with terminals of two dropout surge arrestors that operatively extend between the surge arrestor contacts connected to the bus-bar and earth contacts carried by a mounting base such that, in use, with a drop-out fuse and two dropout surge arrestors in situ in the assembly, the dropout fuse and each of the two surge arrestors are able to drop out independently of each other as and when it may become blown or otherwise ineffective.
  • the surge arrestor contacts that are connected to the bus-bar and the earth contacts carried by the mounting base are arranged so that surge arrestors in situ therein are arranged electrically in parallel with each other such that both are connected to the surge arrestor contacts connected to the bus-bar and the earth contacts simultaneously and each is able to drop out if it becomes blown or otherwise ineffective with the other remaining in circuit as backup protection.
  • the surge arrestor contacts that are connected to the busbar and the earth contacts are carried by the mounting base and are arranged so that surge arrestors operatively in situ therein are connected to earth by way of a switching assembly that electrically connects one earth contact at a time into the circuit between the surge arrestor contacts connected to the bus-bar and earth.
  • a switching assembly that electrically connects one earth contact at a time into the circuit between the surge arrestor contacts connected to the bus-bar and earth.
  • the single earth conductor is preferably associated with the earth contacts of the surge arrestors such that a disconnected surge arrestor earth contact is insulated at least sufficiently to isolate it from earth to a substantial extent with a single earth connection being made to the single earth conductor that sequentially connects one surge arrestor earth contact to earth and, should an installed surge arrestor drop out, the weight of the dropped out surge arrestor is arranged to move the movable single earth conductor to its other terminal position in which the other surge arrestor earth terminal is connected to the single earth connection.
  • dropout surge arrestors to be arranged to move in planes that are generally upright and parallel to a plane of movement of the dropout fuse holder; for the dropout surge arrestor contacts and co-operating earth contacts to be orientated such that a surge arrestor installed therein extends transverse to the dropout fuse; for the dropout surge arrestors to be arranged one on each side of the dropout fuse holder; for the electrically conductive surge arrestor contacts carried by the bus-bar to be releasable with respect to co- operant terminals of the surge arrestors in which instance the other ends of the surge arrestors contact, in use, the earth contacts carried by the mounting base by way of articulated dropout contact assemblies; for the dropout fuse holder to be orientated such that the fuse holder in its operative position is generally upright but somewhat inclined towards the direction in which it is intended it should drop out if it should blow; and for the dropout fuse holder to be a double sequential dropout fuse action in the case of a fuse assembly such
  • Still further features of the invention provide for there to be a single mounting base supporting both insulator parts that carry at their opposite ends the supply contact and the articulated contact connecting in use to the two ends of the dropout fuse holder; for the supply contact and the surge arrestor contacts that form releasable terminal assemblies to each include an electrically conductive leaf in which instance the releasable contact includes a recess for receiving a domed contact surface provided on an input contact at one end of each surge arrestor or fuse holder as the case may be; and for each of the electrically conductive articulated contact assemblies associated with the fuse holder and the surge arrestors to include a bifurcated cradle for releasably receiving, in use, a relatively rotatable articulated contact assembly associated with an end of a surge arrestor to be grounded in its operative position.
  • the invention also provides a combination surge arrestor and dropout fuse assembly as defined above in combination with a dropout fuse holder and two surge arrestors installed within the assembly in an operative position.
  • Figure 1 is a schematic side view of one embodiment of the first variation of surge arrestor and fuse assembly according to the invention with a dropout fuse holder and surge arrestors in situ in their operative positions;
  • Figure 2 is an elevation of the embodiment of the invention illustrated in Figure 1 taken in a direction in which the bus-bar is foremost;
  • Figure 3 is an underneath view of the embodiment of the invention illustrated in Figure
  • Figure 4 is the same as Figure 1 but illustrating one surge arrestor dropped out
  • Figure 5 is the same as Figure 2 but illustrating the one surge arrestor dropped out as illustrated in Figure 4;
  • Figure 6 is the same as Figure 1 but illustrating the one surge arrestor dropped out and the fuse holder dropped out;
  • Figure 7 is the same as Figure 2 but illustrating the one surge arrestor dropped out as well as the fuse holder dropped out as illustrated in Figure 6;
  • Figure 8 is the same as Figure 1 but illustrating both the surge arrestors dropped out as well as the fuse holder dropped out;
  • Figure 9 is the same as Figure 2 but illustrating both the surge arrestors and the fuse holder dropped out as illustrated in Figure 8;
  • Figure 10 is the same as Figure 1 but showing a double fuse holder assembly according to WO 2015/040541 in situ in place of the single fuse holder illustrated in the other drawing Figures;
  • Figure 1 1 is a schematic elevation of an embodiment of the second variation of the invention taken in a direction in which the bus-bar is foremost as in the instance of Figure 2 and showing a single conductor that is movable between two terminal positions to connect the two surge arresters to earth sequentially;
  • Figure 12 is a sectional view of a part of a fuse holder leaf contact showing the recess therein;
  • Figure 13 is a sectional view of a part of one surge arrester contact showing the recess therein;
  • Figure 14 is a schematic side view of an embodiment of a third variation of a surge arrester and fuse assembly according to the invention with a dropout fuse holder and surge arresters in situ in their respective operative positions;
  • Figure 15 is the same as Figure 14 but illustrating one surge arrester dropped out
  • Figure 16 is a schematic diagram which illustrates an example releasable terminal assembly that may be used in aspects of this disclosure, the Figure showing a fuse holder being held in the terminal assembly;
  • Figure 17 is the same as Figure 16 but without the fuse holder
  • Figure 18 is a schematic diagram showing a plan view of a retaining member of the releasable terminal assembly of Figure 16;
  • Figure 19 is a schematic diagram which illustrates the releasable terminal assembly of
  • Figure 16 in use, with the fuse holder in a first position
  • Figure 20 is a schematic diagram which illustrates the releasable terminal assembly of
  • Figure 21 is a schematic diagram which illustrates the releasable terminal assembly of
  • Figure 16 in use, with the fuse holder in a first position.
  • a combination surge arrester and dropout fuse assembly comprises an electrically conductive supply bus-bar (1 ) carried by a first insulator part (2) supported on a mounting base (3) wherein the bus-bar supplies an electrically conductive supply contact in a female recess (4) in a resilient leaf (5).
  • the resilient leaf and supply contact are arranged to supply an operatively upper cooperating releasable terminal (6) of a dropout fuse holder (7).
  • the other end of the fuse holder is carried by an articulated contact assembly (8) supported by a second insulator part (1 1 ) that is also carried at its opposite end by the same mounting base (3).
  • each of the first insulator part and the second insulator part is provided by a separate insulator.
  • the electrically conductive articulated contact assembly includes a bifurcated cradle releasably receiving a relatively rotatable articulated contact assembly associated with the lower end of the fuse holder of a type that is well known in the art.
  • the dropout fuse holder is orientated such that the fuse holder, when it is in its operative position, is generally upright but somewhat inclined towards the direction in which it is intended to drop out if it should blow. The dropout takes place therefore in a dropout plane that is roughly vertical.
  • the bus-bar also has two electrically conductive surge arrestor contacts (13) for cooperation with releasable terminals (14) of two dropout surge arrestors (15) arranged electrically in parallel with each other between the surge arrestor contacts connected to the bus-bar and articulated earth contacts (16) carried by the mounting base (3).
  • the dropout surge arrestors are arranged to move, when they drop out, in planes that are generally upright and parallel to the plane of movement of the dropout fuse holder.
  • the dropout surge arrestors are orientated, in their operative positions, in a generally transverse direction relative to the dropout fuse and typically generally horizontally.
  • the two dropout surge arrestors are arranged one on each side of the dropout fuse holder.
  • the surge arrestor contacts thus form releasable terminal assemblies that each include an electrically conductive leaf in which instance the releasable contact includes a recess (18) for receiving a domed contact surface (17) provided on an input contact at one end of each surge arrestor as in the instance of the dropout fuse holder.
  • the articulated earth contacts (16) typically include a bifurcated cradle for releasably receiving, in use, a relatively rotatable articulated contact assembly associated with a grounded end of the relevant surge arrestor.
  • the dropout fuse and each of the two surge arrestors are able to drop out independently of each other as an when it may become blown or otherwise ineffective.
  • the assembly described will effectively protect a transformer or other plant that is being fed by an electrical supply passing through the assembly against both overcurrent that would cause the dropout fuse to blow and overvoltage that would cause typically one of the surge arrestors to possibly become ineffective and dropout in consequence of its expulsion fuse activating.
  • each of the two surge arrestors should be of a rating such that each could independently of the other serve the function of damping a voltage surge by a controlled leakage to earth. It is highly unlikely that both surge arrestors would be rendered inoperative at the same time and it would be expected that only one would dropout at any one time and the other could serve its purpose for possibly extended periods of time.
  • the objective achieved by the invention is that substantially more time would be available for the dropped out surge arrestor to be identified and replaced, which would be done with the system live in known manner.
  • a lighter surge arrestor could be more easily manipulated using long reach tools than the standard surge arrestor. This may also result in cost efficiencies where, for example, two lower rating (e.g. distribution class) surge arrestors in parallel cost less than a single, higher rating (e.g. station class) surge arrestor. Also, in the event that the mechanical strength and the bus-bar is unable to maintain proper contact with a remaining surge arrestor after one has dropped out and in consequence of the other still placing pressure on the female dome receptor that is carried by the bus-bar, the busbar could be supported by one or more additional insulators secured to the mounting base in order to provide the required stability.
  • the surge arrestors could be of any suitable type and that there is no restriction on the construction of the surge arrestors other than to render them suitable for inclusion in an assembly as described above.
  • the surge arrestor is of a metal oxide, in particular zinc oxide and is of a voltage dependent resistor type (varistor) that can become faulty if subjected to an excessive severity of surge or number of surges. In such an instance, the normally high resistance of the arrestor to normal voltages becomes diminished and the input terminal of the surge arrestor may become effectively grounded by way of the voltage dependent resistors.
  • the purpose of the expulsion fuse or other device is, as indicated above, to disconnect the surge arrestor under such conditions. It should be noted that the surge arrestors protect the dropout fuse.
  • a change-over mechanism may be implemented such that only one surge arrestor is connected into the circuit at any one time. If one surge arrestor blows, the other will automatically become engaged.
  • the combination dropout fuse and surge arrestor assembly could be enhanced by using a dropout fuse holder of the double sequential dropout fuse action as is described in international patent publication WO 2015/040541 entitled DROPOUT FUSE ASSEMBLY AND FUSE HOLDER.
  • a second fuse (21 ) is contained in piggy back manner within a piggy back fuse holder (22) that can be interchangeably installed in the dropout fuse holder part of the assembly to provide for a second fuse to be rendered active sequentially in the event that a first fuse holder drops out after blowing. Further details of that aspect of the dropout fuse holder may be obtained by referring to that published patent application.
  • the surge arrestors are arranged electrically to be connected one at a time into the circuit between the surge arrestor contacts connected to the bus-bar and the earth contacts at the opposite end of the surge arrestors that are not shown in the Figure for reasons of clarity. They are the same as is described above other than for the following.
  • the earth contacts take the form of articulated earth contacts that include a bifurcated cradle (31 ), as in the instances described above for releasably receiving, in use, a relatively rotatable articulated contact assembly associated with the co-operating end of the relevant surge arrestor that is to be grounded in use.
  • Each bifurcated cradle has an earth contact (32) electrically connected to it and that earth contact is arranged to be selectively electrically connected to earth by being engaged by one end of an electrically conductive elongate single earth conductor (33) having contacts (34) at each end.
  • the single earth conductor is movable between two terminal positions, namely one in which the one surge arrestor is connected into the operative condition by being connected to earth and one in which it is open circuit so that the bifurcated cradle is not connected to earth.
  • the surge arrestor earth contacts are insulated from direct contact with earth at least sufficiently to isolate them from earth to a substantial extent with a single earth connection being made to the single earth conductor that connects only one of the earth contacts of a surge arrestor to earth at any one time.
  • the insulation used is merely sufficient to create sufficient dielectric strength that the two are not at a potential, common enough for the two surge arrestors to operate in unison. Should that one surge arrestor drop out, it will be retained by the cradle but its weight under the influence of gravity is employed to engage and move the movable single earth conductor to its other terminal position in which the earth terminal of the other surge arrestor is connected to the single earth conductor and thus to earth.
  • a bi-stable retainer device (35) of any suitable type that typically includes a spring catch may be used to hold the movable single earth conductor in either of its two terminal positions at any one time as may be required.
  • a failed dropped out surge arrestor bottom is to be replaced this can be replaced live with a new surge arrestor installed that can be installed whilst the other surge arrestor stays in circuit.
  • the older surge arrestor being the only one in circuit means that will ensure that the newer surge arrestor will serve as back up protection.
  • the design offers advantageous functionality in that the failed surge arrestor can be identified at all times.
  • FIGS 14 and 15 are schematic side views of an embodiment of a third variation of a surge arrestor and fuse assembly according to the invention.
  • a combination surge arrestor and dropout fuse assembly (40) comprises an electrically conductive supply bus-bar (41 ) carried by an insulator (42) supported on a mounting base (43).
  • the insulator (42) has a first insulator part (42A) and a second insulator part (42B) and the bus-bar (41 ) is carried by an end of the first insulator part.
  • the first and second insulator parts may be provided by a single insulator.
  • the insulator (42) has a connector for connecting to the mounting base (43) which is intermediate the two insulator parts (42A, 42B).
  • the bus-bar (41 ) supplies an electrically conductive supply contact in a resilient leaf, similar to the variations described above.
  • the resilient leaf and supply contact are arranged to supply an operatively upper cooperating releasable terminal of a dropout fuse holder.
  • the other end of the fuse holder is carried by an articulated contact assembly (45) supported by the second part (42B) of the insulator.
  • the insulator parts (42A, 42B) are arranged to support the dropout fuse holder in a generally upright orientation and parallel to the insulator (42) when it is in its operative condition.
  • the insulator (42) may accordingly provide a so-called straight cut-out insulator.
  • the bus-bar (41 ) also has two electrically conductive surge arrestor contacts (47) for cooperation with releasable terminals of two dropout surge arrestors (51 ) arranged electrically in parallel with each other between the surge arrestor contacts connected to the bus-bar and articulated earth contacts (53) carried by the mounting base (43).
  • the dropout surge arrestors are arranged to move, when they drop out, in planes that are generally upright and parallel to the plane of movement of the dropout fuse holder.
  • the dropout surge arrestors are orientated, in their operative positions, in a generally inclined orientation relative to the dropout fuse.
  • the two dropout surge arrestors may be arranged one on each side of the dropout fuse holder.
  • the surge arrestor contacts thus form releasable terminal assemblies that each include an electrically conductive leaf arranged to cooperate with a contact surface provided on an input contact at one end of each surge arrestor.
  • the articulated earth contacts (53) may include a bifurcated cradle for releasably receiving, in use, a relatively rotatable articulated contact assembly associated with a grounded end of the relevant surge arrestor.
  • FIGs 16 and 17 are schematic diagrams which illustrate an example releasable terminal assembly (50) that may be used in aspects of this disclosure.
  • the releasable terminal assembly (50) includes an electrically conductive resilient leaf (51 ) which is arranged to engage a cooperating end (53) of a surge arrestor or fuse holder, as the case may be.
  • a gap is shown between the end (53) of the surge arrestor or fuse holder and the leaf (51 ) to illustrate the effect of another component (e.g. surge arrestor operating).
  • the leaf (51 ) may provide a protuberance (as illustrated) or a recess for cooperating with and engaging the end (53) of the surge arrestor or fuse holder and releasably to hold captive the surge arrestor or fuse holder in the assembly (50).
  • a retaining member (55) is fixed to the leaf (51 ) and configured operatively to engage the end (53) of the surge arrestor or fuse holder.
  • the retaining member (55), a plan view of which is shown in Figure 18, may be provided by a flat steel spring which is bent back on itself to define a channel. Opposing sides of the spring may be bent inwards towards each other to narrow the channel near the open end thereof and to provide an engagement formation at the end of the retaining member (55) for operatively engaging the end (53) of the surge arrestor or fuse holder.
  • the channel may be shaped and dimensioned to receive the end (53) of the surge arrestor or fuse holder.
  • the retaining member (55) is supported on the leaf (51 ) in an orientation which is generally inclined relative to an axis of the surge arrestor or fuse holder which it engages, with side walls of the channel locating on either side of the dropout plane in which the surge arrestor or fuse holder moves when being expelled or installed. This provides a raised section which allows movement of the end of the surge arrestor or fuse holder past the retaining member.
  • the retaining member may be located so as to allow a smaller gap associated with an adjacent component operation, which is not the same as the operation of the drop out travel distance of the drop out mechanism.
  • the resilience of the steel spring may be selected such that the narrowing of the channel expands and allows passage of the end (53) of the surge arrestor or fuse holder during insertion or expulsion thereof with an adequate force.
  • the releasable terminal assembly (50) with retaining member (55) is configured to prevent drop out of a non-operated surge arrestor or fuse holder.
  • Figures 19 to 21 are schematic diagrams which illustrate the releasable terminal assembly (50) in use.
  • the respective Figures include a schematic side view of the assembly (50) and a schematic view illustrating the retaining member (55) interacting with the end (53) of the fuse holder (57).
  • the retaining member (55) described with reference to Figures 16 to 21 may be provided in any of the embodiments or variations described herein.
  • a gap created by an adjacent component operation e.g. another fuse or a surge arrestor blowing
  • the retaining member may allow the non- operated component to move upwards and create a small gap while preventing the non-operated component from falling out.
  • the retaining member prevents the fuse or other (non-operated) surge arrestor from falling into the open position thereby preventing unwanted disconnection of supply (in the case of the fuse opening) or loss of a back-up surge arrestor (in the case of the non-operated surge arrestor opening).

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Abstract

L'invention concerne un assemblage parasurtenseur et fusibles de coupure combiné dans lequel une barre omnibus d'alimentation électro-conductrice (1) portée par un isolant (2) est supportée sur une base de montage (3) comprend une barre omnibus (1) fournissant un contact d'alimentation pour une borne libérable coopérant fonctionnellement supérieure d'un support de fusible de coupure porté au niveau de son extrémité opposée par un assemblage de contact articulé. La barre omnibus (1) comprend également au moins deux contacts de parasurtenseur (13) électro-conducteurs destinés à coopérer avec des bornes de deux limiteurs de surtension (15) qui s'étendent de manière fonctionnelle entre les contacts de parasurtenseur (13) connectés à la barre omnibus (1) et des contacts mise à la terre portés par une base de montage (3). Lors de l'utilisation, avec un fusible de coupure et deux limiteurs de surtension (15) in situ dans l'assemblage, le fusible de coupure et chacun des deux limiteurs de surtension (15) sont capables de chuter indépendamment l'une de l'autre et, lorsqu'elle peut être soufflée ou autrement inefficace.
PCT/IB2017/055730 2016-09-21 2017-09-21 Parasurtenseur et assemblage fusible WO2018055547A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2019/02185A ZA201902185B (en) 2016-09-21 2019-04-08 Surge arrestor and fuse assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201606507 2016-09-21
ZA2016/06507 2016-09-21

Publications (1)

Publication Number Publication Date
WO2018055547A1 true WO2018055547A1 (fr) 2018-03-29

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Application Number Title Priority Date Filing Date
PCT/IB2017/055730 WO2018055547A1 (fr) 2016-09-21 2017-09-21 Parasurtenseur et assemblage fusible

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WO (1) WO2018055547A1 (fr)
ZA (1) ZA201902185B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11728641B2 (en) 2022-01-10 2023-08-15 Saudi Arabian Oil Company System and method for controlling and monitoring parallel surge arresters and bushings of a power transformer and motor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412526A (en) * 1993-02-10 1995-05-02 Square D Company Surge arrester circuit and housing therefor
WO2009127934A2 (fr) * 2008-04-18 2009-10-22 Lukas Marthinus Fick Boîtier de transformateur, traversée de transformateur et parasurtenseur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412526A (en) * 1993-02-10 1995-05-02 Square D Company Surge arrester circuit and housing therefor
WO2009127934A2 (fr) * 2008-04-18 2009-10-22 Lukas Marthinus Fick Boîtier de transformateur, traversée de transformateur et parasurtenseur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11728641B2 (en) 2022-01-10 2023-08-15 Saudi Arabian Oil Company System and method for controlling and monitoring parallel surge arresters and bushings of a power transformer and motor

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ZA201902185B (en) 2020-06-24

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