WO2006089643A1 - Systeme de securite pour installation de distribution, notamment pour installation de distribution moyenne tension - Google Patents

Systeme de securite pour installation de distribution, notamment pour installation de distribution moyenne tension Download PDF

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Publication number
WO2006089643A1
WO2006089643A1 PCT/EP2006/001138 EP2006001138W WO2006089643A1 WO 2006089643 A1 WO2006089643 A1 WO 2006089643A1 EP 2006001138 W EP2006001138 W EP 2006001138W WO 2006089643 A1 WO2006089643 A1 WO 2006089643A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuse
sealing
arrangement
sealing head
sealing body
Prior art date
Application number
PCT/EP2006/001138
Other languages
German (de)
English (en)
Other versions
WO2006089643A8 (fr
Inventor
Ole Granhaug
Huigang Sun
Jan-Henrik Kuhlefelt
Lars Johan Lindqvist
Pal Skryten
Xianbo Deng
Original Assignee
Abb Technologie 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 Abb Technologie Ag filed Critical Abb Technologie Ag
Priority to CN2006800058631A priority Critical patent/CN101128901B/zh
Priority to EP06706776A priority patent/EP1851781B1/fr
Publication of WO2006089643A1 publication Critical patent/WO2006089643A1/fr
Publication of WO2006089643A8 publication Critical patent/WO2006089643A8/fr
Priority to NO20074875A priority patent/NO337400B1/no

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H01H9/102—Fuses mounted on or constituting the movable contact parts of the switch
    • 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
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • 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
    • H01H85/0013—Means for preventing damage, e.g. by ambient influences to the fuse
    • H01H85/0021—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices
    • H01H85/0026—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices casings for the fuse and its base contacts
    • 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
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • 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
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H2085/2095—Triangular setup of fuses, e.g. for space saving

Definitions

  • Safety arrangement for a switchgear in particular for a medium-voltage switchgear.
  • the invention relates to a fuse arrangement for a switchgear, in particular for a medium-voltage switchgear, according to the preamble of claim 1.
  • Such a fuse arrangement has become known for example from DE 41 16 058.
  • This fuse arrangement comprises a cylindrical quiver made of insulating material, which is closed at one end and there has a contacting device for a security cartridge inserted into the quiver. At the other, open end a quiver lid is arranged, which bears against the free end of the quiver and is screwed there.
  • An electrically conductive connection between the fuse and a terminal contact is generated by a tensioning device having an inner ring with outer cone and an outer ring with inner cone, which are formed in the form of spring-ring clamping elements.
  • the movement of the release pin on the fuse is transmitted by means of a slider and a reversing lever on a striker, which is movably guided in the quiver lid and perpendicular to the central axis of the fuse.
  • a securing arrangement has become known in which a fuse is inserted into a cylindrical container closed at one end; at the closed end is located within the container, a contact cylinder, with the inner surface of the inner end of the fuse comes into contact.
  • This contact container has a pin which is led out of the bottom side of the container, so that there an electrical line can be connected.
  • the opposite, open end of the container has an inner cone which tapers towards the interior of the container into which a conical plug adapted to its outer surface co-operates, the outer surface of the plug against the inner surface of the cone shape on the container depressed is. Located in the area of the free end of the cylindrical container.
  • a similar electrode is also formed on the contact cylinder, so that a total of three connection options exist: a first at the open end, the second at the closed end, both perpendicular to the center axis of the fuse and running in the direction of the central axis of the fuse third at the bottom ,
  • EP 0 81 653 A1 A similar embodiment can also be found in EP 0 81 653 A1.
  • the fuse box in which the fuse is inserted is closed at one end and has there a contact cylinder, which has a projection which protrudes in the direction of the securing longitudinal axis of the bottom of the container.
  • the other end is closed in the same way as in the arrangement according to FR 2 607 330 by means of a cone plug made of elastic material, wherein it is not specified how the plug is fixed. In all known arrangements easy disassembly of the fuse is not possible.
  • a safety arrangement which has become known which has a container, which is closed on one side and made of insulating material, into which the safety device can be inserted; at the other end a handle device is provided with a disassembly is possible.
  • This handle device has a shaft of insulating material which is inserted into the interior of the container. At the inner end, the shaft has an electrically conductive contact sleeve, which comes with the adjacent contact of the fuse in electrically conductive connection.
  • a gripping device formed by a plate on which are mounted two walls perpendicular thereto and fixed therebetween, between which there is a spindle acting as a shaft for handling the gripping device.
  • the object of the invention is to further improve a fuse arrangement of the type mentioned, so that the disassembly and assembly of the fuse is simplified.
  • the invention is characterized in that the fuse cartridge is fixedly connected at its first end with a on the front side, preferably on the frame or on the front wall of the switchgear closure device having a sealing body whose outer surface has a tapered in the direction of the fuse outer cone shape , which corresponds to a matched inner cone shape at the first end of the insulating container and having a sealing body connected to the sealing head, and that between the sealing body and the sealing head, a spring arrangement which exerts in the final assembly on the sealing body a pressing this in the inner cone shape of the insulating container, is provided , wherein the sealing head is arranged outside of the insulating body.
  • a spring arrangement which has a non-linear spring core line.
  • a non-linear spring core line preferably has a plate spring arrangement with at least one disc spring.
  • At least one spring pair composed of two disc springs is provided, the plate springs of each spring pair resting against each other at their inner edges and against the sealing body or the sealing head with their outer edges.
  • a preferred embodiment may be that the sealing body at least partially made of a soft elastic material, for. B. silicone rubber.
  • the sealing body can either consist entirely of a soft-elastic material or be provided on its outer cone shape with a soft elastic layer.
  • a soft elastic layer is provided for sealing on the inner cone shape as well as on the outer cone shape.
  • a plate will be attached, which transfers the force of the spring arrangement to the sealing body.
  • the sealing head is coupled to a lever arrangement with which the sealing head from a position in which the spring arrangement GE is biased, can be brought into a position in which the spring assembly is relaxed, and back.
  • a tulip-shaped located on a circular circumference finger assembly holding arrangement, with which the first end of the fuse is mechanically fixed.
  • To the finger assembly also includes a clamping element with which the finger assembly is pressed against the fuse and pressed.
  • FIG. 1 is a front view of a switchgear with fuse arrangement
  • FIG. 2 is a schematic sectional view through the first end of a fuse box with inserted fuse
  • FIG. 3 is a perspective sectional view of the other end of the insulating container, without a fuse
  • FIG. 4 is a sectional view of a sealing body with sealing head
  • FIG. 5 is a perspective view of a lever assembly with which the sealing head and sealing body can be dismantled or mounted, and
  • Fig. 6 shows a force-displacement characteristic of a spring arrangement between the sealing head and
  • a switchgear as is known, for example, from DE (Mp. No. 05/525) registered in parallel, has a switch panel 10, in the upper region of which busbars 11 are mounted, to which switch-disconnectors 12 are connected.
  • the lower end of the switch-disconnector that is, each individual switch-disconnector pole 12, is electrically connected to conductors 13, 14 and 15, each having a fuse arrangement 16, 17 and 18.
  • the fuse assemblies 16 to 18 are located below the switch-disconnector poles, and below the fuse assemblies 16 to 18 cable terminals 19, 20 and 21 are provided, which are electrically connected via further conductors 22, 23, 24 with the fuse assemblies 16 to 18.
  • the conductors 13, 14 and 15 connect to the second end of the insulating container, whereas the leading to the cable connection points 19, 20 and 21 conductors 22, 23 and 24 approximately in the central region, measured in the longitudinal direction of the fuse assemblies 16 to 18, connect to this ,
  • a fuse arrangement according to the invention comprises a cylindrical insulating body 30 whose end on the left in the drawing, that is to say the second end 31, is closed by an electrically conductive cap 32, the cap 32 having a cylindrical wall 33 comprising the outer surface of the insulating body 30.
  • the insulating body 30 has on its outer surface a groove 30a, in which an annular fixing element 30b is used, on which the cylindrical wall 33 of the cap 32 is attached.
  • a circumferential groove 32b is introduced, which directly opposite a groove 30c in the region of the end edge of the insulating body 30; in the thus formed, circumferential torus shape is a seal 32c, preferably an O-ring seal inserted.
  • a contact assembly 34 is further attached, which have a Tu ⁇ - pont contact shape.
  • a connection 35 is provided, on which, for example, the conductor 13 should be connected radially.
  • a fuse 36 Within the cylindrical container or the insulating container 30 is a fuse 36, from which a Stimende a contact pin 37 protrudes, which has entered into electrically conductive connection with the contact assembly 34.
  • the other end of the fuse 36 is contacted with a contact device, see below, which is electrically connected via inside the insulating body 30 extending lines 38 with a perpendicular to the longitudinal axis of the fuse 36 extending terminal 39, which is approximately in the middle between the located at both ends of the insulating body 30 and to each of which a conductor 22, 23, 24 are connected.
  • the insulating container 30 has at its first end 31a, which is opposed to the second end with the metal cap 32, see Fig. 3, on its inner surface a conical surface 40 which tapers into the interior of the insulating or expanded to the outside.
  • a sealing body 41 is inserted, which consists of elastic material, for example made of silicone, whose outer surface 42 has a cone shape, which tapers into the interior of the container 30 and the inner cone surface 40 is adjusted.
  • a sealing head 43 Coupled to the sealing body 41 is a sealing head 43, wherein the sealing head 43 is movable relative to the sealing body 41 to a small extent.
  • an insulating tube 44 is guided, which at the fuse facing, in the drawing Fig.
  • a support ring 49 is applied made of electrically conductive material, which is adapted to the contour of the inner surface 48 and is in high-voltage potential when befindaji fuse.
  • the support ring 49 also abuts against the inner surface 48.
  • the support ring 49 has a bell shape, wherein the open side of the bell shape is opened in the direction of the interior of the insulating container.
  • the sealing body 41 comprises the outer surface 48 of the bell shape; this bell shape is chosen so that the sealing body 41, when pressed together, is supported on its entire outer surface 42 in the direction of the outer surface 42.
  • the first end of the fuse 36 which is partially shown here by dashed lines, is inserted with an extension 36a between the fixing elements 52, 53 and held between the fixing elements 52, 53, in which the fixing elements 52, 53 outside comprehensive clamping device 54, the one Pipe clamp may be, this fixing elements 52, 54 presses against the outer surface of the extension 36 a, so that the fuse 36 is fixedly connected to the sealing head 41.
  • contact springs 131 are mounted, which are pressed by a resilient clamping ring 132 radially outward, so that when the sealing body 41 is inserted together with the fuse 36 in the container 30, these contact elements 131 are pressed against contact elements 133 which correspond to the line 38.
  • the inner line 38 may be formed of a plurality of elongated conductor portions, which on the inner surface of the insulating 30 are attached.
  • To the fuse (not shown) includes a transmission element 55 to which a trip bar 56 is connected, which is movably guided through the interior of the tube 44 and in the position shown in Fig. 4 does not protrude beyond the sealing head 43.
  • the trip bar 36 is moved in the direction of arrow P by means of a spring, whereby a trigger for a higher-level circuit breaker is made.
  • a guide element 57 is formed for the trip bar 56, which is annular and connected via a peripheral conical web 58 on the inner wall of the tube 44.
  • the conical web 58 opens towards the thread 45.
  • a circumferential groove 59 is provided, into which a seal 60 is inserted.
  • the guide member 57 has a through hole 134 through which the trip bar 26 is guided.
  • the other end of the tube 44 protrudes from the sealing body 41 and ends in a stepwise adjoining extension 61, whose outer diameter is greater than the outer diameter of the tube 44.
  • a peripheral edge 63 of a cup body 64th whose bottom 65 has a guide passage 66 for the trip bar 56.
  • a groove 67 On the outside of the bottom 66 is a groove 67, in which a seal 68 is introduced.
  • the carrier element 57 and the bottom 65 there are two approximately tubular spacer elements 69 and 70, which are guided at opposite ends with flange edges 71 and 72 within the tube 44 and lie with their adjacent ends against each other.
  • the outer diameter of the flange edges 71, 72 corresponds to the inner diameter of the tubes 44.
  • These spacers 69 and 70 serve with their flange edges 71 and 72 to intercept any pressure forces that also act inwardly upon compression of the sealing body.
  • the space 135, which is located between the flange edges 71 and 72 within the tube 44 is filled with insulating oil, which via radial openings 136 which are located at least in the spacer element 39, and in the space between the spacer elements 69, 70 and Trigger bar 56 can flow into it.
  • the cup body 64 has in the region of its free end, d. H. in the region of the peripheral edge 63, a radially outwardly projecting bead 137, and on the inner surface of the extension 63, a circumferential, inwardly projecting nose 138 is formed; when the cup body 64 is pressed into the interior of the tube 44, the bead 137 snaps behind the circumferential nose 138, so that the cup body 64 is fixed there.
  • a circumferential groove 139 located in the bottom of the cup body on the outer surface, d. H. on its wall facing the space 135 a circumferential groove 139 in which a seal 140 is located.
  • the seals 60, 68 and 140 serve to seal the inner space 135, so that the insulating oil located there is prevented from flowing out of the space 135, and thus serve to prevent leakage.
  • the sealing head 43 in which the extension 61 is located, has a passage opening 73 which, in the direction of the sealing body 41, has a graduation 74 which coincides with the pattern. Fung 62 of the tube cooperates, wherein between the two in the darg Crowzieren position a distance is provided.
  • the tube 44 which consists of insulating material, has on its outer surface a cone shape, which tapers towards securing.
  • a support plate 80 At the securement-side end of the sealing body 43 is a support plate 80 and between the support plate 80 and the opposite surface 81 there are two disc springs 82 and 83 which are in the position shown in Fig. 4 under mechanical tension, d. H. are tense and push the sealing body 41 against the direction of the arrow P in the inner cone 40 of the insulating container 30.
  • the spring arrangement has a non-linear characteristic, as shown in FIG. On the horizontal axis is the path around which the spring is compressed and on the vertical axis the force that compresses the spring is recorded.
  • the characteristic K of the spring arrangement has an increase which decreases as the path increases.
  • a force difference ⁇ p corresponding to the path difference ⁇ s is relatively small. In this way it is achieved that compensated tolerances have a relatively small influence on the force that is required to push the sealing body into the sealing cone, so that cavities in which discharges can form are avoided.
  • the sealing head 43 has an elongated shape which runs perpendicular to the longitudinal extension of the fuse, so that the sealing head 43 forms a T-shape with the sealing body 41 in the assembled state ,
  • pins 84, 85 are formed, via which the distance between the sealing head 43 and the sealing body 41 can be changed.
  • a plate 100 is fixed, which has three openings 101 to 103, whose inner diameter corresponds to the outer diameter of the sealing head 41.
  • each opening 101 to 103 On each side of each opening 101 to 103 is a post-like stand 104, 105; 106, 107 and 108 and 109 are placed vertically, which stands are each composed of two identical stator elements 104a and 104b, which take a distance between them.
  • the stands 105 to 109 are formed in the same way as the stand 104 with the two stator elements 104a and 104b.
  • An arm 110 and 111 of a handle arrangement 112 engages between the upright elements of each upright, in which case only the handle arrangement 112 for the opening 101 is described; the handle assembly for the openings 102 and 103 are the same.
  • the two arms 110 and 111 extend approximately parallel to one another and together with two obliquely arranged bends 113 and 114 form a U-shape; the bends 113 and 114 are (not visible) at their ends facing each other provided with further bends, which are parallel to the arms 110 and 111 and perpendicular to the line connecting the posts 104 and 105, these two bends as extensions of a handle 115 from Insulating material are included.
  • the length of the handles is dimensioned to remain within the range bounded by side walls in any position in which the handles 115 are parallel to the plate, so that the movement of the handles is not hindered by wall sections. ⁇
  • the arms 110 and 111 are pivotally connected via pivots 116 and 117 to the posts 104 and 105, so that the handle assembly 112 can be pivoted from the position in which the arms are parallel to the plate 100, into a position in which the arms
  • the handles can also be moved to a position in which they are pivoted relative to the position shown in FIG. 5 by 180 °, so that the handles 115 in the opposite direction projecting than that shown in Fig. 5.
  • the arms 110 and 111 each have a recess 118 and 119; the ends of the posts 104, 105 are fork-shaped with a fork opening 120 and 121 slotted.
  • the pins 84 and 85 of the sealing head 43 engage in the recess 118 and reach through this and also engage in the fork opening 120, 121 a.
  • the handles push the pins 84, 85 through the recesses 118, 119 into the interior of the insulating, whereby the disc springs 83, 82 are biased with a certain force, so that the sealing body 41 level. if it is pressed with a certain force in the inner cone surface on the insulating body, whereby an electrical tightness between the two cone surfaces is generated.
  • the sealing body 41 in its entirety consists of soft elastic material.

Abstract

L'invention concerne un système de sécurité pour installation de distribution, comportant un récipient isolant cylindrique, ouvert à une première extrémité, à base de matériau isolant, dans lequel une cartouche fusible ou un fusible peut être introduit(e), dont la première extrémité est en communication électroconductrice avec un premier système de contacts et la seconde extrémité, avec un second système de contacts. La cartouche fusible est solidarisée à sa première extrémité avec un dispositif de blocage pour le récipient isolant, qui présente un corps d'étanchéité (41) et une tête d'étanchéité (43) reliée au corps étanche (41). Un système de ressort (82, 83) est prévu entre le corps d'étanchéité (41) et la tête d'étanchéité (43).
PCT/EP2006/001138 2005-02-25 2006-02-09 Systeme de securite pour installation de distribution, notamment pour installation de distribution moyenne tension WO2006089643A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2006800058631A CN101128901B (zh) 2005-02-25 2006-02-09 一种用于开关装置，尤其用于中压开关装置的安全装置
EP06706776A EP1851781B1 (fr) 2005-02-25 2006-02-09 Systeme de securite pour installation de distribution, notamment pour installation de distribution moyenne tension
NO20074875A NO337400B1 (no) 2005-02-25 2007-09-25 Sikkerhetsarrangement for en koplingssammenstilling, spesielt for en medium spenning koplingssammenstilling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005009235.7 2005-02-25
DE200510009235 DE102005009235A1 (de) 2005-02-25 2005-02-25 Sicherheitsanordnung für eine Schaltanlage, insbesondere für eine Mittelspannungsschaltanlage

Publications (2)

Publication Number Publication Date
WO2006089643A1 true WO2006089643A1 (fr) 2006-08-31
WO2006089643A8 WO2006089643A8 (fr) 2007-09-20

Family

ID=36177678

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/001138 WO2006089643A1 (fr) 2005-02-25 2006-02-09 Systeme de securite pour installation de distribution, notamment pour installation de distribution moyenne tension

Country Status (5)

Country Link
EP (1) EP1851781B1 (fr)
CN (1) CN101128901B (fr)
DE (1) DE102005009235A1 (fr)
NO (1) NO337400B1 (fr)
WO (1) WO2006089643A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005017903A1 (de) 2005-04-18 2006-10-19 Abb Technology Ag Sicherungsanordnung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829810A (en) 1971-12-22 1974-08-13 Gen Electric Bushing, fuse and fuseholder
US4010437A (en) * 1974-08-26 1977-03-01 Kuhlman Corporation Fuse holders for transformers
FR2607330A1 (fr) 1986-01-21 1988-05-27 Guetrelle Claude Dispositif d'isolation des fusibles hpc moyenne tension
EP0389029A1 (fr) 1989-03-22 1990-09-26 Holec Systemen En Componenten B.V. Dispositif pour la préhension et support pour la manipulation d'un fusible tubulaire
DE4116058A1 (de) * 1991-05-16 1992-11-19 Concordia Sprecher Energie Schaltanlage
EP0881653A1 (fr) 1997-05-27 1998-12-02 Schneider Electric Sa Dispositif porte-fusible tel un puits-fusible pour appareillage électrique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623424C2 (de) * 1986-07-11 1997-09-25 Wickmann Werke Gmbh Verfahren zum Abschalten einer ein- oder mehrphasigen elektrischen Schaltanlage und Einrichtung zur Abschaltung
DE4212756C2 (de) * 1992-04-16 1994-05-05 Pfisterer Elektrotech Karl Stopfen zum elektrisch dichten Verschließen einer Steckbuchse
CN2195796Y (zh) * 1994-04-19 1995-04-26 孙锡章 半封闭插入式熔断器
DE19934350C1 (de) * 1999-07-22 2000-09-28 Felten & Guilleaume Ag Metallgekapselte, druckgasisolierte Schaltanlage für Mittelspannungs-Netzstationen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829810A (en) 1971-12-22 1974-08-13 Gen Electric Bushing, fuse and fuseholder
US4010437A (en) * 1974-08-26 1977-03-01 Kuhlman Corporation Fuse holders for transformers
FR2607330A1 (fr) 1986-01-21 1988-05-27 Guetrelle Claude Dispositif d'isolation des fusibles hpc moyenne tension
EP0389029A1 (fr) 1989-03-22 1990-09-26 Holec Systemen En Componenten B.V. Dispositif pour la préhension et support pour la manipulation d'un fusible tubulaire
DE4116058A1 (de) * 1991-05-16 1992-11-19 Concordia Sprecher Energie Schaltanlage
EP0881653A1 (fr) 1997-05-27 1998-12-02 Schneider Electric Sa Dispositif porte-fusible tel un puits-fusible pour appareillage électrique

Also Published As

Publication number Publication date
WO2006089643A8 (fr) 2007-09-20
CN101128901B (zh) 2011-07-13
DE102005009235A1 (de) 2006-08-31
CN101128901A (zh) 2008-02-20
EP1851781B1 (fr) 2012-09-26
NO337400B1 (no) 2016-04-04
EP1851781A1 (fr) 2007-11-07
NO20074875L (no) 2007-11-26

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