SE461362B

SE461362B - Group switchboard and earthing device

Info

Publication number: SE461362B
Application number: SE8802185A
Authority: SE
Inventors: P Bergsten
Original assignee: Asea Brown Boveri
Priority date: 1988-06-13
Filing date: 1988-06-13
Publication date: 1990-02-05
Also published as: SE8802185L; SE8802185D0

Abstract

In a group switchboard with miniature circuit breakers by means of an earthing device 13 according to this invention it is possible to carry out earthing and short- circuiting of a group lead in order to carry out work on this. The switchboard is equipped with a metal casing 9 which via a support 1 is in electrical contact with the protective lead connection 8 of the switchboard. The earthing device is equipped with a device 16 for fastening the device to the casing 9 and devices 16, 17 for establishing electrical contact between the casing 9 and the output terminal 5 of the group lead's miniature circuit breaker 3. The earthing device covers the front of the miniature circuit breaker and prevents operation of this. <IMAGE>

Description

)~b 461 362- Den i fig 1 och 2 visade gruppcentralen har ett plattjärnsstativ 1 på vilket en bärskena 2 är fixerad. På skenan 2 är ett antal dvärgbrytare 3 monterade. Brytarna har anslutningsklämmor H och 5 för inkommande resp utgående ledningar samt ett mellan ett till- och ett frànläge rörligt manöverorgan 6 i form av en vippa. Centralen är på konventionellt sätt försedd med en nollskena 7 och en skyddsledarskena 8, vilka uppbäres av och är elektriskt förbundna med stativet 1. The group center shown in Figs. 1 and 2 has a flat iron frame 1 on which a support rail 2 is fixed. A number of miniature switches 3 are mounted on the rail 2. The switches have connection terminals H and 5 for incoming and outgoing lines, respectively, and an actuator 6 movable between an on and off position in the form of a rocker. The control panel is provided in a conventional manner with a neutral rail 7 and a protective conductor rail 8, which are supported by and are electrically connected to the stand 1.

Centralen är försedd med en plàtkàpa 9, som medelst plàtskruvar 10 är fäst vid tvâ fästvinklar (ej visade). som är fixerade vid stativet 1 vid ändarna av bärskenan 2. Kàpan är försedd med en rektangulär öppning 11 genom vilken främre delen av brytarna 3 med manöverorganen 6 skjuter ut.The center is provided with a plate cover 9, which by means of plate screws 10 is fastened at two mounting angles (not shown). which are fixed to the frame 1 at the ends of the support rail 2. The cover is provided with a rectangular opening 11 through which the front part of the switches 3 with the operating members 6 protrudes.

Längs raden av brytare sträcker sig en profilerad list 12 för fasthallning av en märkremsa. Kåpan är vidare försedd med ett moduliserat hálmönster 18, 19, som är anpassat till det nedan beskrivna jordningsdonet. Över den ena av brytarna i centralen är ett jordningsdon 13 monterat.A profiled strip 12 for holding a marking strip extends along the row of switches. The cover is further provided with a modulated straw pattern 18, 19, which is adapted to the earthing device described below. A grounding device 13 is mounted above one of the switches in the control panel.

Jordningsdonet har ett av plast utfört handtag 14 (fig 3) av samma bredd som brytaren 3. Vid handtagets ena ände är en bygel 15 av metall fixerad, vilken uppbär två skruvar 16 och 17. Den ena skruven 16 är en gängpress- ande skruv, som är anordnad att genom inskruvning i ett hål 18 i kåpan 9 fixera jordningsdonet vid kåpan och samtidigt åstadkomma elektrisk (metallisk) kontakt mellan kåpan och bygeln. Den andra skruven 17 skjuter in genom ett mittför brytarens 3 uttagsklämma 5 anordnat hål 19 i kåpan 9.The earthing device has a handle 14 made of plastic (Fig. 3) of the same width as the switch 3. At one end of the handle a bracket 15 of metal is fixed, which supports two screws 16 and 17. One screw 16 is a thread-pressing screw, which is arranged to fix the earthing device to the cover by screwing in a hole 18 in the cover 9 and at the same time establish electrical (metallic) contact between the cover and the bracket. The second screw 17 projects through a hole 19 in the housing 9 arranged in the middle of the terminal 5 of the switch 3.

Skruven 17 sitter i ett gängat hål i bygeln 15 och är avsedd att inskruvas så långt, att elektrisk kontakt etableras mellan uttagsklämman 5 och bygeln 15. Genom hålet 19 är brytarens uttagsklämma åtkomlig för spän- ningstestning innan jordningsdonet appliceras.The screw 17 is located in a threaded hole in the bracket 15 and is intended to be screwed in so far that electrical contact is established between the socket clamp 5 and the bracket 15. Through the hole 19, the socket of the switch is accessible for voltage testing before the earthing device is applied.

Jordningsdonets handtag 14 har en mittvägg 20 som är försedd med en urtag- ning, vilken är anpassad till brytarens manöverorgan 6 på så sätt, att jordningsdonet kan monteras över brytaren endast då manöverdonet befinner sig i frånläget.The handle 14 of the earthing device has a middle wall 20 which is provided with a recess which is adapted to the operating member 6 of the switch in such a way that the earthing device can be mounted over the switch only when the actuator is in the off position.

Då arbete skall utföras på en via gruppcentralen matad anlâggningsdel frànkopplas dvärgbrytaren 3 för den aktuella gruppen, och jordningsdonet 13 skruvas fast på kåpan 9 med den gängpressande skruven 16. Jordnings- donet täcker då dvärgbrytarens front och omöjliggör tillslag av denna.When work is to be carried out on a system part fed via the group center, the miniature circuit breaker 3 for the relevant group is disconnected, and the earthing device 13 is screwed onto the cover 9 with the thread-pressing screw 16. The earthing device then covers the front of the miniature switch

Därefter åtdrages skruven 17. så att god kontakt med uttagsklämman 5 iThen tighten the screw 17. so that good contact with the socket clamp 5 i

Claims

461 362 the miniature switch is obtained. Through the screw 17, the metallic shackle 15 and the threaded screw 16, electrical contact has now been obtained between the socket clamp 5 and the cover 9, which in turn via the stand 1 is in metallic contact with the neutral and protective conductor rails 7 and 8. To ensure good electrical contact between the cover and the stand, it may be appropriate to arrange between the cover and the above-mentioned mounting angles of the stand means capable of penetrating any layers of paint or oxide. Such a member may, for example, consist of a metal tip arranged at the respective mounting angle abutting surface against the cover directed towards the plate surface of the cover. The tip may, for example, be formed by embossing or consist of a separate member which is fixed at the mounting angle in a suitable manner. PATENT REQUIREMENTS

A group control panel comprising a number of miniature circuit breakers (3), a connection terminal (8) for protective conductors and a metal housing (9) which is in electrical contact with the protective conductor terminal, said circuit breakers (3) having connection means (4 and 5, respectively) for incoming and outgoing conductors and an actuator (6) movable between an on and off position projecting through an opening (11) in the housing, characterized in that the housing (9) is provided with a device (18) for fixing a grounding device (13) to the cover and has a hole (19) arranged in the middle of the respective conductor connection means (5) for an contact means (17) belonging to the grounding device for providing electrical contact between the connection means (5) for output conductors and the cover (9).

Group control panel according to claim 1, comprising a metal stand (1) carrying said miniature switch (3), protective conductor clamp (8) and cover (9), characterized in that contact establishing means capable of being arranged between the cover (9) and the stand (1) to penetrate any paint or oxide layers.

Grounding device for a miniature switch (3) arranged in a group center equipped with a metal cover (9) and equipped with connecting means (H and 5 respectively) for incoming and outgoing conductors and with an actuator (6) movable between an on and off position which pushes out through an opening (11) in the housing, characterized in that the earthing device (13) is provided with means (16) for fixing the device to the housing (9) and means (16, 17) for establishing electrical contact between the connection means of the switch (5) for outgoing conductors and cover (9). I 461 362.

Grounding device according to Claim 3, characterized in that it is arranged to cover the operating means (6) of the switch.

Grounding device according to Claim 3 or 4, characterized in that it is arranged to lock the operating means (6) of the switch in the outlet.

Grounding device according to claim 3, Å or 5, characterized in that it comprises a metal part (15) with two through screws (16. 17), one of which (16) is arranged to fix the grounding device (13) to the housing. (9) and at the same time provide electrical contact between the housing (9) and the metal part (15), while the other (17) is arranged to provide electrical contact between the metal part (15) and the connection means (5) of the switch for outgoing conductors.