SE448134B

SE448134B - STELLVERKSSKAP

Info

Publication number: SE448134B
Application number: SE8207334A
Authority: SE
Inventors: J Johansson; J Karlsson
Original assignee: Asea Ab
Priority date: 1982-12-22
Filing date: 1982-12-22
Publication date: 1987-01-19
Also published as: SE8207334L; EP0113887B1; EP0113887A3; EP0113887A2; DE3375967D1; SE8207334D0

Description

15 20 25 30 44ss134f ¿ 5* 21 Ändamålet med föreliggande uppfinning är att vid_inomhus högspänningsställ- verk med utdragbara apparater åstadkomma en anordning som sluter tätt runt apparaternas kontaktskenor och tätar mot rökgaser mellan olika celler som skall hållas åtskilda. Vidare skall-anordningen inte vara behäftad med de ovannämnda olägenheterna hos den beskrivna tidigare föreslagna anordningen för samma ändamål. Detta ändamål uppnås enligt uppfinningen genom en anord- ning som har de i patentkrav 1 angivna sârdragen." Uppfinningen skall närmare beskrivas i anslutning till ett utföringsexempel som visas i bifogade ritning, i vilken rig 1 visar 1 frontvy ett skåp för ett me11anspänn1ngss:ä11verk, fig 2 visar ett vertikalsnitt genom ställverksskåpet efter linjen II-II i rig 1, ' " ' “ fig 3 visar idvy framifrån en av flera i ställverksskåpet anordnade automa- tiskt slutande genomföringar för en i skåpet anordnad brytares kontakt- skenor,f fig H visar ett snitt genom genomföringën efter linjen IV-IV i fig 3, och fíg 5 visar i planvy en i genomföringen ingående gummiplatta. The object of the present invention is to provide, in indoor high-voltage switchgear with extendable devices, a device which closes tightly around the contact rails of the devices and seals against flue gases between different cells which are to be kept separate. Furthermore, the device should not suffer from the above-mentioned disadvantages of the previously proposed device described for the same purpose. This object is achieved according to the invention by a device having the features stated in claim 1. "The invention will be described in more detail in connection with an exemplary embodiment shown in the accompanying drawing, in which line 1 shows in front view a cabinet for a meinsanning clamping plant, Fig. 2 shows a vertical section through the switchgear cabinet along the line II-II in rig 1, Fig. 3 shows a front view from one of several automatically closing bushings arranged in the switchgear cabinet for a switch rails arranged in the cabinet, Fig. H shows a section through the bushing along the line IV-IV in Fig. 3, and Fig. 5 shows in plan view a rubber plate included in the bushing.

Det i fig 1 och 2 visade ställverksskåpet är avsett att ingå i ett mellan- spänningsställverk för märkspänningen 12 kV. Skåpet är genom mellanväggar uppdelat i ett samlingsskeneutrymme l, ett brytarutrvmme.2, ett kabelutrymme' 3 och ett utrymme U fdr mät- och indikeringsorgan. Skåpets front är uppdelad på en övre inspektionslucka 5, en nedfällbar mittlucka 6 framför brytarutrym- met 2 och en nedre lucka 7 framför kabelutrymmet 3; I luckorna Ö och 7 är inspektionsfönster 8 resp 9 anordnader Samlíngsskeneutrymmet 1 innehåller tre samlingsskenor_10, som sträcker sig mellan de i ställverket_ingående bredvid varandra uppställda skåpen. Sam- lingsskenorna 10 är anslutna till var sin i utrymmet 1 fast monterad klyk- kontakt 11. i l Kabelutrymmet 3 innehåller en strömtransformator 12 1 varje fas samt en jord- ningskopplare l3. Strömtransformatorn 12 uppbär vid sin ena anslutningsklämma va' 15 V20 as g H30 35 223 2 2 448 134 en kopplingsskena 14.för anslutning av externa kablar och vid sin andra an- slutningsklämma en fast klykkontakt 15. K V Brytarutrymmet 2 innehåller en utdragbar effektbrytare 16, vilken i fig 2 ar visad 1 sitt driftläge med brytarens instickskontakter 17, 18 inskjutna i de fasta klykkontakterna 1l,71§. Instiçkskontakterna utgöres i det visade utföringsexemplet av kontaktskenor med rektangulärt tvärsnitt, t ex av dimen- sionen 10,k 75 mm. Mellan brytarutrymmet 2 och samlingsskene- och kabelutrym- mena_1, 3 är en isolerande skärmvägg 19 anordnad, vilken är försedd med genom- föringshål 20 (fig.3 och N) för kontaktskenorna 17, 18. I anslutning till varje sådant genomföringshâl är anordnat ett tätningsorgan 21, som i bryta- rens driftläge tätt omsluter den genom hålet sig sträckande kontaktskenan, och som när brytaren dras ut till frånskilt läge automatiskt sluter genom- I föringshålet. iTätningsorganets 21 konstruktion framgår av fig 3-5. Det omfattar en av hårt isolermaterial (t ex epoxiplast) bestående tätningsskiva 22 som är utförd i två sammanhåilna och 1 sidled rörliga haivorzzza, 22b. skivhaivorna pressas i riktning mot varandra av en skivan omslutande ringformad fjäder 23 som löper K' i ett spår i skivans períferi; Fjädern 23 kan utgöras av en O-ring (av gummi) eller av en ändlös skruvfjäder av metalliskt, omagnetiskt material. Varje skivhalva är på sin framåtvettande sida försedd med klackar 24 som tjänar till att styra in respektive kontaktskena mot skivans delningsplan i och för ísärförande av skívhalvorna i pilarnas A riktning. För detta ändamål är klack- arna utförda med mot delningsplanet lutande glidytor 25 för samverkan med kon- "taktskenans-frontyta, vilken åtminstone i övergångspartierna mot skenans sido- _ytor är avrundad. I fig 4 visas med punktstreckade linjer läget för de fasta ioch rörliga kontakterna 11 och 17.The switchgear cabinet shown in Figs. 1 and 2 is intended to be part of an intermediate voltage switchgear for the rated voltage 12 kV. The cabinet is divided by partitions into a busbar space 1, a switch space 2, a cable space 3 and a space U for measuring and indicating means. The front of the cabinet is divided into an upper inspection hatch 5, a fold-down middle hatch 6 in front of the switch compartment 2 and a lower hatch 7 in front of the cable compartment 3; In the doors Ö and 7, inspection windows 8 and 9, respectively, are arranged. The busbar space 1 contains three busbars_10, which extend between the cabinets arranged next to each other in the switchgear. The busbars 10 are each connected to a clamping connector 11 fixedly mounted in the space 1. i l The cable compartment 3 contains a current transformer 12 1 each phase and a grounding coupler l3. The current transformer 12 carries at its one connection terminal V '15 V20 as g H30 35 223 2 2 448 134 a connection rail 14. for connection of external cables and at its other connection terminal a fixed socket contact 15. KV The switch space 2 contains a pull-out circuit breaker 16, which in Fig. 2 is shown in its operating position with the switch's plug-in contacts 17, 18 inserted in the fixed clamp contacts 1l, 71§. The plug-in contacts in the embodiment shown consist of contact rails with a rectangular cross-section, for example of the dimension 10, k 75 mm. Between the switch space 2 and the busbar and cable spaces 1, 3 an insulating screen wall 19 is arranged, which is provided with lead-through holes 20 (Figs. 3 and N) for the contact rails 17, 18. In connection with each such lead-through hole a sealing member is arranged 21, which in the operating position of the switch tightly encloses the contact rail extending through the hole, and which when the switch is pulled out to a separate position automatically closes the lead-through hole. The construction of the sealing member 21 is shown in Figures 3-5. It comprises a sealing plate 22 consisting of hard insulating material (eg epoxy plastic) which is made of two cohesive and laterally movable shafts, 22b. the disc levers are pressed in the direction of each other by a disc-enclosing annular spring 23 running K 'in a groove in the periphery of the disc; The spring 23 may be an O-ring (of rubber) or an endless helical spring of metallic, non-magnetic material. Each disc half is provided on its forward-facing side with lugs 24 which serve to guide the respective contact rail towards the partition plane of the disc in order to separate the disc halves in the direction of the arrows A. For this purpose the lugs are made with sliding surfaces 25 sloping towards the dividing plane for co-operation with the contact surface front surface, which is rounded at least in the transition portions towards the side surfaces of the rail. Fig. 4 shows in dotted lines the position of the fixed and movable contacts 11 and 17.

Av fig 3 framgår att styrklackarna 24 hos den ena skivhalvan 22a är sidoför- skjutna i förhållande till styrklackarna ZU hos den andra skivhalvan 22b.From Fig. 3 it can be seen that the guide lugs 24 of one disc half 22a are offset laterally relative to the guide lugs ZU of the other disc half 22b.

Sidoförskjutningen s mellan motstaende klackar kan exempelvis ligga mellan 5 och 15 mm. Genom denna sidQförskjutning uppnås större petsäkerhet hos an- ordningen, vilken i detta avseende uppfyller normkraven för skyddsform IP 3 enligt lEC 298 och lPH 3 enligt SEN 362103. ii i Varje skivhalva är försedd med en bakåtriktad fästtapp 26 som är rörligt fixerad med hjälp av en isolerande pinne 27 i ett avlångt fästhâl 28 i skârmväggen 19 på så sätt, att skivhalvorna får erforderlig rörlighet i sidled. 2' 2 _ ' ' IThe lateral displacement s between opposite lugs can, for example, be between 5 and 15 mm. By this lateral displacement greater safety of the device is achieved, which in this respect meets the standard requirements for protection form IP 3 according to lEC 298 and lPH 3 according to SEN 362103. ii i Each disc half is provided with a rearwardly directed fastening pin 26 which is movably fixed by means of a insulating pin 27 in an elongate mounting hole 28 in the screen wall 19 in such a way that the disc halves have the required lateral mobility. 2 '2 _' 'I

Claims

In order to avoid slipping and to seal further, in the case of switchgear for higher voltages, it may be appropriate to arrange a semiconducting rubber plate 29 between the movable plate halves 22a, 22b and the screen wall 19. This plate, which shown in plan view in Fig. 5, is provided with a vertical slot 30 and a number of horizontal slots 31 for adaptation to the rectangular cross-section of the contact rail. In addition, it is provided with elongated holes 32 for the sealing plate mounting pins 26. One thin plate 33 of plastic ( e.g. Émylar ") is arranged between the movable disc halves 22a, 22b and the rubber plate 29 to reduce the friction. a Around each bushing hole the screen wall 19 is provided with a wavy fold 34 for extending the creep distances between the different phases and between the phases AND necessary, for example in the case of switchgear for higher rated voltage, the screen wall can be designed with several concentric such folds.The screen wall 19 is suitably made of such a material material such as polycarbonate, that, it becomes transparent. This allows the contact points behind the screen to be easily monitored and any damaged parts washed out in time. With the construction shown, it is moreover achieved that the firing in the event of an arc fault mainly takes place on the movable contact parts (ie on the contact rails of the heir), due to a short-circuit arc burning between the phases under the influence of electrodynamic forces being driven forward. foot points on the contact rails 17 or 18 behind the screen 19. The fact that the burning takes place on the moving contact parts is advantageous, since it is considerably easier to replace the moving parts than the fixed ones. iPATßNTKRAv

Switchgear cabinet containing a pull-out appliance (16) with sockets (17, 18). which are arranged in the operating position of the apparatus to make contact with fixed contacts (11, 15) arranged in the cabinet, wherein between the apparatus and the fixed contacts a screen wall (19) of insulating material fixedly provided in the cabinet is provided with lead-through holes (20) for the pre-insert contacts. in connection with each lead-through hole a sealing member (21) is arranged which in the operating mode of the apparatus encloses the plug-in contact (lï, 18) extending through the hole; which sealing means comprises one end plate (22a¿tà2b) made of hard insulating material 1, such as: resilient means (23) for pressing the two disc halves in the direction of each other, the disc halves (22a, 22b) being arranged to be provided by the plug contact (17 , 18) is disposed laterally for exposing the bushing hole (20) when the plug is inserted into the operating position, characterized in that said resilient member (23) consists of a spring arranged in a circumferential groove in the periphery of the disc. ah g. ”I 448 134

Switchgear cabinet according to Claim 1, characterized in that the spring (23) consists of an endless helical spring of non-magnetic material.

Switchgear cabinet according to Claim 1, characterized in that the spring (23) consists of an O-ring.

H. Switchgear cabinet according to claim 1, 2 or 3, * k ä n n e t e c k n a t thereof; that the sealing plate '(22a, 22b) on its side facing the front of the cabinet is provided with lugs (24) which have sliding surfaces (25) inclined towards the dividing plane of the plate for co-operation with the front surface of the plug contact (17, 18) and for disassembling the plate halves .

Switchgear cabinet according to Claim U, characterized in that the lugs (24) on one disc half (22a) are laterally offset relative to the lugs on the other disc half (22b).

Switchgear cabinet according to one of the preceding claims; k n n e - t e c k n a t by the fact that the screen wall (19) is transparent.

Switchgear cabinet according to one of the preceding claims, characterized in that around each bushing hole (20) the screen wall (19) is provided with at least one wavy fold (39) for extending the creep distance.

Switchgear cabinet according to one of the preceding patent claims, characterized in that a preferably semiconducting plate (29) of rubber or similar elastic material is arranged between the sealing plate (22a, 22b) and the screen wall (19).

Switchgear cabinet according to Claim 8, characterized in that a friction-reducing load plate (33) is arranged between the sealing plate (22a, 22b) and the rubber plate (29).