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Publication numberUS3706839 A
Publication typeGrant
Publication dateDec 19, 1972
Filing dateDec 9, 1971
Priority dateDec 9, 1971
Publication numberUS 3706839 A, US 3706839A, US-A-3706839, US3706839 A, US3706839A
InventorsCler Victor, Comte Bernard
Original AssigneeGram Sa
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Transformer station carried by a mast
US 3706839 A
Abstract
The invention relates to a transformer station carried by a mast. Such a station comprises a transformer and a high voltage connection device last fastened onto the mast the one above the other. A low voltage connection device is located within the hollow mast. An access device to the high voltage circuit-breaker is provided and comprises a ladder, the lower portion of which is foldable, a footbridge surrounded by a hand rail.
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Description  (OCR text may contain errors)

United States Patent Comte et al.

TRANSFORMER STATION CARRIED BY A MAST Inventors: Bernard Comte, 1723 Marly; Victor Cler, 1700 Fribourg, both of Switzerland Assignee: Gram S.A., Broye, Fribourg, Switzerland Filed: Dec. 9, 1971 Appl. No.: 206,292

US. Cl. ..174/45 TD, 200/48 R Int. Cl. ..ll01h 31/00 Field of Search ..307/149; 174/45 R, 45 TD;-

References Cited UNITED STATES PATENTS l/l957 Storsand ..3l7/18 A [451 7 Dec. 19, 1972 Primary Examiner-Robert K. Schaefer Assistant Examiner-William J. Smith Attorney-Irvin S. Thompson et al.

[5 7] ABSTRACT The invention relates to a transformer station carried by a mast. Such a station comprises a transformer and a high voltage connection device last fastened onto the mast the one above the other. A low voltage connection device is located within the hollow mast. An access device to the high voltage circuit-breaker is provided and comprises a ladder, the lower portion of which is foldable, a footbridge surrounded by a hand rail.

- The station is remarkable in that it comprises further a safety device hindering the unfolding of the ladder as long as the high voltage line as well as the primary of the transformer has not both been grounded.

17 Claims, 6 Drawing Figures PATENTED DEC 19 1972 SHEET 2 [IF 3 PATENTED DE 19 1973 SHEET 3 BF 3 The present invention has for its object a transformer station located on a mast comprising a mast the lower end of which is fastened in a base located within the earth and the upper end of which is provided with a transversal arm receiving the fastenings for the high tension line. This station comprises further a transformer as well as a high voltage connection device also carried by the mast, comprising a circuit-breaker for each phase as well as a low voltage connection device located within the mast in the vicinity of its lower end. This transformer station comprises at least an access device to the high voltage circuit-breaker constituted by a platform, a hand rail and a ladder fixed along the mast and the lower portion of which is foldable.

This transformer station distinguishes itself by the fact that it comprises a safety device hindering the unfolding of the lower portion of the ladder before that the two connections of each of the high voltage circuitbreaker are not grounded.

The attached-drawing shows schematically and by ways example one embodiment of the transformer station according to the invention.

FIG. 1 is a general elevation view of it.

FIG. 2 is a view from above of the high voltage connection device and of a part of the access device, the mast being broken.

FIG. 3 is a cross section along line Ill-III of FIG. 2.

FIG. 4 is a perspective view of the lower portion of the mast, the safety device being in active position.

FIG. 5 is a similar view' to FIG. 4 the safety device being in inactive position.

FIG. 6 is a plan view of a detail of a chair carrying the transformer.

The transformer station shown comprises a hollow concrete mast 1 the lower end of which is fastened in a base located within the earth (not shown) whereas the upper end has an arm 2 receiving fastening means of a high voltage line 3, 4, 5. A transformer 6 is carried by a chair (shown in detail in FIG. 6) fastened to the mast 1.

The mast l'comprises in one of its lateral faces a modified at will in function particularly of the dimensions of the transformer 6 that it has to carry.

This fixing plate 9 carry two supports 12 vertically spaced and between which are hinged near the ends of the support, two beams constituted each by two irons 13, which are parallel and connected at their free ends.

The transformer 6 is led on these two beams the angular position of which is adjusted in function of the width of the base 14 of the transformer 6. The base of the transformer 6 is fastened onto the chair by means of tie-rods 7 passing through the irons 13 of each beam so that the distance separating the transformer from the mast may be very easily adjusted by simple sliding of the transformer on the beams before tightening the tierods.

Above the transformer, at a determined distance, is located the high voltage connection device. This high voltage connection comprises also a fixing plate 14 fastened to the mast in the same way as the chair of the transformer 6 by means of bolts and nuts cooperating with the profile 8 sunk in to the body of the mast 1.

This fixing plate 14 comprises a support 15 extending perpendicularly to the mast 1 above the transformer 6. This support 15 presents a transversal cross section of square shape one of the diagonal of which is located vertically. This support carries, for each of the phases of the high voltage line 3, 4, 5, a circuit-breaker unit comprising connecting means to the line and to the transformer as well as a fuse 16. In that way each fuse 16 is connected at a high voltage line 3, 4 or 5 on the one hand and to a primary connection 17, 18 or 19 of the transformer on the other hand. These fuses 16 are fastened in removable way by contacting pliers in a a known way.

It is evident that each contacting plier of the fuse 16 as well as the connection means of the said fuses as well to thehigh voltage lines 3, 4, 5 as to the primary connection 17, l8 19 of the transformer 6 are electrically insulated with respect to the support 15 and thus to the mast 1. These pliers are directed towards the mast 1 to facilitate the replacement of the fuses 16.

The low voltage connection of the secondary of the transformer 6 are connected by insulated electrical cables passing within the cavity of the mast l to a low voltage connection device located in the lower portion of the mast 1 and to which access is given by a door 20. This low voltage connection device is well known and will not be described in details, insures to connect the low voltage outputs either to aerial line or to underground cable.

It is to be noted that thanks to the disposition and to the conception of the high voltage connection device it is easily possible to cross the high voltage phases if it is necessary. As a matter of fact the connectingmeans connecting the fuses 16 to each of the lines 3, 4, 5 being disposed in line according to a direction which is parallel to the high voltage line 3, 4, 5 and underneath this line, each fuse 16 may be indifferently connected to anyone of the phases 3, 4, 5 of the high voltage line.

Finally due to the position and the shape of the support 15 all the edges of the high voltage connection device are oblique that is inclined with respect to a horizontal direction, which enables a favorable flow of the water avoiding the formation of ice and avoids that the birds come to rest on the parts constituting the high voltage connection device. This permits to reduce the overall dimensions in an important way. Finally this disposition leaves three sides of the mast 1 free for the low voltage aerial output.

It has to be noted further that a hook (now shown) is fastened under the support 15 of the high voltage connection device, just underneath the central position of the transformer.This hook may be used to rise a transformer by means of a pulley. As the high voltage connection device itself is relatively light, the station may be mounted without important elevating engine.

During the rising of the transformer 6, the beams of the chair are widened to give free passage, than they are put closer together and positioned before resting the transformer on this beams.

This transformer station comprises further an access device to enable the replacement of the fuse cartridges 16. This access device comprises a footbridge 21 also fastened to the profile 8 sunk into the body of the mast 1. This footbridge is-provided with three containers 22 intended for the storing of fuse cartridges 16. A hand rail 24 surrounds three sides of the footbridge for the security of the worker. A container 23, fastened to the hand rail contains a hook or plier enabling to a worker located on the footbridge 21 to exchange the fuse cartridges 16. I

Finally this access device comprises a ladder 25 fastened along the mast 1 to give way to the footbridge 21. This ladder 25 comprises a lower foldable portion to hinder the access of the footbridge to none authorized persons.

Finally this transformer station comprises further a safety device hindering the unfolding of the lower part of the ladder, and thus the access to the footbridge as long as the two connections of each of the fuse car? tridgesl6 are not grounded.

The safety device comprises a series of metallic double contacts 26, 27, fast with fixing pads 28 surrounding the support but not tightened on this one, in order to be able to slide along this support. These double contacts 26, 27 are equal in number to the number of the fuse cartridges 16 and their ends are placed in such a way that they may through a linear displacement along the support, come in abutment against the contacting parts 29, 30 respectively electrically connected to the contacting. pliers of the cartridges located on either side of these cartridges.

In the example shown the three fixing pads28 are fast the one to the others by a flat-iron 31. One of the fixing pads 28 comprises an extension 32 the free end of which is hinged on the end of a control rod 33 the other end of which is hinged in 34 to an eccentric 35. The eccentric 35'is fastened to the upper end of an actuating rod 36 pivoted in fixed supports on the ladder 25.

The lower end of this actuating rod 36 is provided with a handle 37 for its driving into rotation. This handle 37 is provided on the one hand with a lug 38 provided with a hole and on the other hand with a stop 39 having the shape of an arc of circle.

When the double contacts 26, 27 are in the position shown at FIG. 2, that is that these contacts 26, 27 are separated from the corresponding contact parts 29, 30, the handle 37 is in the position shown at FIG. 5. In this position and if the ladder is folded, the padlock 40 may fix the handle 37 to a bracket 41 fastened with the foldable ladder.

Even if the worker takes the padlock 40 out, he cannot displace the lower portion of the ladder 25 before he has actuated completely the handle 37 to the right (FIG. 5) since the stop 39 is otherwise located on the way of displacement of the ladder 25.

When the handle has been completely displaced (FIG. 4) the double contacts 26, 27 has been displaced by the kinematic connections 36, 35, 33, 32 and 28 until they abut against the corresponding connecting parts 29, 30. In this position one realizes the simultaneous grounding on the one hand of the high voltage line 3, 4, 5 and on the other hand of the primary connections 17, 18, l9-of the transformer so that no current is able to be present in the circuit-breaker neither through the high voltage line nor through induction from the secondary of the transformer.

The worker can only unfold the ladder 25, and thus step up to the footbridge, when the precited double grounding has been made and incurs thus no danger. In fact if the worker has forgotten to open the circuitbreakers which are normally provided on the foregoing mast of the high voltage line, the circuit-breaker of this part of the line would have been automatically actuated by the short circuit caused by the contacts 26, 27, the fixing pates 28 and the flat-iron 31.

It is further to be noted that the short-circuit which is thus caused does not provoke an excessive current within the parts 26, 27, 28 and 31 due to the fact that only the capacitive line current is absorbed in this linkage.

To ensure a safe grounding the flat-iron 31 is electrically connected by a metallic supple connection directly to the ground of the mast 1.

This safety device is simple but absolutely efficient, the worker having no possibility to go to the footbridge before the high voltage line as well as the primary connection of the transformer has been set to ground.

In fact even once the worker is inposition on the footbridge it is not possible to displace the handle 37 and thus the contacts 26, 27 since the stop 39 is than in abutment against one step of the ladder 25.

What we claim is:

1. A transformer station on a mast comprising a transformer as well as a high voltage'connection device having one circuit-breaker for each phase carried by the mast and a low voltage connection device located within the hollow mast, as well as an access device to the high voltage circuit-breaker constituted by a footbridge provided with a hand rail and a ladder fastened along the mast a lower part of which is foldable, and comprising further a safety device hindering the unfolding of the lower portion of the ladder before the two connections of each high voltage circuit-breaker has been individually set to ground.

2. Station according to claim 1 in which the high voltage connection device comprises a support, presenting in cross section a non circular shape, fastened by one end on the mast and extending perpendicularly from this mast.

3. Station according to claim 2 in which a high voltage circuit-breaker unit is fastened on said support for each phase of the high voltage line and that each of these units comprises a removable fuse cartridge fastened in contact pliers located obliquely.

4. Station according to claim 3 in which the safety device comprises a number of double grounding contacts equal to the number of high volta fuse cartridges; each carried by a fixing pad slidingly mounted on the support of the high voltage connection device.

5. Station according to claim 4 in which each of the double contacts cooperates with a connection part of the corresponding, circuit-breaker unit, located on either side of the fuse cartridge in order to short-circuit it.

6. Station according to claim 5 in which the fixing pates carrying the double grounding contacts are all fastened the one to the other and by the fact that they are electrically connected to ground.

7. Station according to claim 6 in which the assembly of the fixing pads carrying the grounding double contacts in connected by a control rod to an eccentric fast with an actuating rod extending along the ladder and pivoted in supports fast with the mast.

l060ll 0424 8. Station according to claim 7 characterized by the fact that the lower end or an actuating rod is provided with a handle as well as a stop.

9. Station according to claim 8 characterized by the fact that the stop is located on the way of the unfolding of the lower folding portion of the ladder as long as the double contacts are not in abutments against the corresponding contact parts.

10. Station according to claim 9 in which in unfolded position of the ladder, the stop is in abutment against one step of this ladder maintaining positively the double grounding contacts in abutment against the corresponding contact parts.

11. Station according to claim 10 in which the safety device comprises locking means of the ladder in folded position respectively in unfolded position.

12. Station according to claim 11 in which these locking means locks the handle to the ladder in folded position.

13. Station according to one of the preceding claims characterized by the fact that the support of the high voltage connection device has a polygonal shape in cross section.

14. Station according to claim 13 in which the shape of the cross section of the support is squared and in which one of the diagonals is located vertically.

15. Station according to one of the preceding claims characterized by the fact that the axis of the support of the high voltage connection device extends parallelly to the axis of the high voltage line.

16. Station according to claim 15 characterized by the fact that the support of the high voltage connection device comprises a rising hook located under the median cartouche.

17. Station according to one of the claims 1 to 12 characterized by the fact that the transformer is carried by a chair fastened to the mast and comprising two horizontal beams displaceable angularly around vertical axes.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2778890 *Jan 31, 1952Jan 22, 1957Oerlikon MaschfArrangement for the safety grounding of vehicles with inertia mass impulsion
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5581958 *Jan 27, 1995Dec 10, 1996Unr Industries, Inc.Pole and cabinet structure for antenna-mounting at communications site
US6400558 *Nov 8, 2000Jun 4, 2002Ppl Electric Utilities CorporationLine deadend structure and method
WO2001086106A1 *Apr 27, 2001Nov 15, 2001Laug HorstSafety ladder
WO2002039556A2 *Nov 8, 2001May 16, 2002Chaply DanielLine deadend structure and method
Classifications
U.S. Classification174/45.00R, 200/48.00R
International ClassificationE06C9/00, H02G7/20, H01F27/06, E04H12/24, E06C9/08, H02B5/00, H02B5/02, E04H12/00, H01H31/04, H01H31/00
Cooperative ClassificationE06C9/085, H02B5/02, H01F27/06, H01H31/04, H02G7/20, E04H12/24
European ClassificationE06C9/08B, H01F27/06, H01H31/04, H02G7/20, H02B5/02