BG113239A - Selector with preselector for step voltage regulator with isolated phases - Google Patents

Abstract

The selector has a supporting structure of a bottom (1), an insulating cylinder (2) and an insulating disc (32). A metal column (5) is located at the bottom, on which an even Maltese wheel (6) and an odd Maltese wheel (7) are mounted. A double translation (9) with two drive rollers (10) is mounted on a parallel metal column (8). An insulating disk (26) is attached to the upper part of the column (5), which carries an insulating tube (27) fixed at its upper end to a disk (32). Even and odd contact rings (28, 29) are mounted on the outside of the pipe (27). The even Maltese wheel (6) has a radial arm (34) which carries vertical insulating rails (35) with contact lamellas (36) connecting the even contact rings (28) with even stationary contacts (3) mounted on the cylinder (2). The construction of elements (38, 39) making the connection between odd contact rings (29) and odd contacts (4) is similar. Wires (31) are located inside the pipe (27), which are connected to the respective contact rings (28, 29) by metal brackets (30), and are fixed above by insulating plates (33) to the disc (32). The wires are connected to through contacts (44) of the oil pan (19) by horizontal (41) and vertical (42) wires. The drive of the double translation (9) is made by a vertical isolation shaft (16), coupled with a shaft (18) of the oil pan (19) through gears (15, 14, 11). L-shaped carriers (51) of contact lamellae (52) of a side-mounted pre-selector are fixed on an insulating tube (25) bearing concentrically on the shaft (16). This tube is rotated 90 degrees by the chain of elements: disk (20) with roller (21), double arm element (22), gear (23) and gear (24).

Description

SELECTOR WITH PRE-SELECTOR FOR STEP VOLTAGE REGULATOR WITH INSULATED PHASES

FIELD OF TECHNOLOGY

The invention relates to a pre-selected step controller, which is installed in power transformers with voltage regulation under load. Deviations of the transformer control winding are switched without load by means of a selector, and the pre-selector doubles the number of steps. The ones chosen by step regulators with regulation in the star center have relatively compact and small constructions. The ones chosen on step regulators with isolated phases have complicated constructions and have significantly larger overall dimensions. This is especially true for step regulators for large rated currents.

BACKGROUND OF THE INVENTION

It is known to choose a pre-selector for step voltage regulator (1), containing a cage of insulating columns fastened between the upper housing with mechanisms and a round bottom. The housing is fitted with a gear drive, a Maltese gear from an even Maltese wheel, an odd Maltese wheel and a double gear, and a mechanism for actuating the pre-selector. The three phases are arranged one below the other. Each phase has a number of even and odd fixed contact elements mounted on two levels on the insulation columns. In the middle of the cage there are an even contact ring and an odd contact ring for each phase. The rings are connected to current-carrying brackets, which attach them to the insulation columns. Inside the rings there is an even drive isolation shaft connected to the even Maltese wheel and an odd drive shaft connected to the odd Maltese wheel. On the driving insulating shafts are caught horizontally located even mobile current-carrying contact node and odd mobile current-carrying contact node, which alternately contact with the fixed contact elements. Flexible insulated conductors are connected to the external fronts of the current-carrying consoles, which are connected to the outlet contacts of an oil container located above the selected one. The pre-selector is laterally located on the dialer and has two fixed contact elements and a movable contact node.

The disadvantage of this pre-selector is that it is complex in construction and has large dimensions and weight. Another disadvantage is that the externally located connecting wires significantly increase the volume of the selector and prevent the convenient connection of the wires from the deviations of the control winding of the transformer.

TECHNICAL SUMMARY OF THE INVENTION

The object of the invention is to provide a pre-selector of a step controller with isolated phases, which has a simplified construction and has small overall dimensions and weight. Also, there should be no connecting wires around the voter.

The problem is solved by a selector with a pre-selector for step voltage regulator with isolated phases, containing a Maltese gear of even and odd Maltese wheels and a double gear, a mechanism for activating the double gear and a mechanism for switching the pre-selector. An even contact ring and an odd contact ring are arranged in layers in the center of the voter, one for each phase. There are also two drive insulating shafts with movable contact lamellas, which make a connection between the contact rings and fixed contact elements attached in a circle to the insulating cage. The contact rings are connected to the contact elements of the oil container by wires located externally around the selector. The pre-voter is mounted on the side of the voter.

According to the invention, the Maltese gear and other mechanisms are mounted on the metal bottom of the selector. One even Maltese wheel and one odd Maltese wheel are mounted on a metal column attached to it. Parallel to the first metal column is a second metal column, on which is mounted a double gear with two drive rollers. At the top of the first metal column is attached an insulating disk bearing an insulating tube, which is reinforced at its upper end by a larger insulating disk attached to a bearing insulating cylinder. One even contact ring and one odd contact ring for each phase are mounted externally to the insulating pipe. Conductors are connected to each contact ring by means of current-carrying brackets, which pass vertically inside the pipe and are fastened at their upper end to the large insulating ring by means of insulating plates. A horizontal radially directed conductor is bolted to the upper face of each conductor by a bolt, which passes in a vertical direction and is connected to a certain contact of an oil vessel. The horizontal part of the wires is fixed in grooves made on the supporting insulating cylinder. The distance between the wires, the contact rings and the bottom of the oil pan are coordinated so as to provide the necessary interfacial insulation. A horizontal arm connected to vertically arranged insulating rails is attached to the Maltese even wheel. Contact lamellas connecting the contact rings with even fixed contact elements mounted on the insulating cylinder are mounted on them. In the same way, the odd Maltese wheel carries a horizontal arm connected by insulating rails with contact lamellas mounted on them connecting the contact rings with odd fixed contact elements mounted on the insulating cylinder. The upper end of the even insulating rails is connected to a branch-like element which, in addition to bearing contact lamellae, also serves to mount to the even contact ring of phase X. Similarly, the upper end of the odd insulating rails is connected to a branch-shaped element. that it wears contact lamellas, also serves for bearing to the odd contact ring of phase X. On the column under the double gear is mounted a gear wheel connected to it by a freewheel clutch. This gear is engaged with a parasitic gear, which in turn is engaged with a third gear rotated one revolution by a vertical insulating shaft coupled with an insulating shaft of the oil pan of the step regulator. Attached to the odd Maltese wheel is a disk with a roller that interacts functionally with the Maltese sector of a two-arm element mounted on the double translation column. On the other arm of the two-arm element there is a gear sector engaged with a parasitic gear, which on the other hand is engaged with another gear connected to the insulating tubular shaft. This shaft is mounted coaxially on the drive insulation shaft. Three L-shaped carriers with contact lamellas mounted on them are attached to it, which make contact with contacts connected to the even fixed contact elements and fixed contact elements of the pre-selector. These contact elements are mounted on vertical insulation columns.

An advantage of a pre-selector for a step voltage regulator according to the invention is that it has a simplified design and reduced overall dimensions. There are no external wires that increase the transverse dimensions and prevent the connection of the wires from the control winding of the transformer. Another advantage is that the connecting wires are not insulated and have good cooling in the transformer oil.

EXPLANATION OF THE ATTACHED FIGURES

An exemplary embodiment of the selector with a pre-selector with isolated phases according to the invention is shown in the attached figures, of which:

Figure 1 is a longitudinal section through the selector with a preselector, showing its connection to an oil pan with a power switch.

Figure 2 - Cross section (AA) of the Maltese gear and drive gears.

Figure 3 - cross section (BB) of the pre-selector actuation mechanisms.

Figure 4 - Cross section (C-C) through the contact systems of the selector and the pre-selector.

Figure 5 - location of the connecting wires between the selector and the oil tank.

EXAMPLES OF EMBODIMENT OF THE INVENTION

Characteristic of the new design of the voter is that the Maltese gear and other mechanisms are not above the contact systems, but below them at the bottom of the voter. This allows the connecting wires not to be located around the selector, but to be placed inside it.

The supporting structure consists of a metal bottom 1 and an insulating cylinder 2, which may be composed of several tubular segments in order to facilitate installation. On the insulating cylinder 2 are mounted even fixed contact elements 3 and odd fixed contact elements 4 for each phase X, Y, Z. In the middle of the bottom 1 is mounted a round metal column 5, on which by rolling bearings are mounted even Maltese wheel 6 and an odd Maltese wheel 7. Parallel to column 5 there is a second fixed column 8 on which is mounted a double gear 9 with two drive rollers 10. They interact alternately with the two Maltese wheels 6 and 7. The drive of the double gear 9 is done by gear 11 , which is mounted below it on a column 8 and is connected to it by a known freewheel connector 12. When reversing the movement, it ensures that there is no selection of a new step, but only switching of the power switch. A third metal column 13 is mounted to the bottom 1, on which a gear 14 is mounted, which is connected on one side with a gear 11 and on the other side with a gear 15. This gear rotates one turn by a vertical insulating shaft 16 which is connected by a coupling 17 to a known insulating shaft 18 of an oil vessel 19. The pre-selector is driven by a disk 20 with a roller 21 connected to the odd Maltese wheel 7. Above the column 8 on one side there is a Maltese sector connected to the roller 21 and on the other side there is a gear sector engaged with a gear 23 mounted on a column 13. This gear is connected to a smaller gear 24 which rotates 90 ° insulating tube shaft 25 coaxially mounted on shaft 16. At the top of column 5 is attached an insulating disk 26, which carries an insulating tube 27. Coaxially on the tube 27 are mounted an even current-carrying disk 28 and an odd current-carrying disk 29, one for each aza. A vertical round wire 31, for example made of copper, is attached to each disk via a current-carrying bracket 30. The tube 27 is fixed at its upper end with an insulating disk 32 attached to the insulating cylinder 2. By means of insulating plates 33 attached to the disk 32 the upper ends of the wires 31 are reinforced. two insulating rails 35. On them are attached the even movable contact lamellas 36 with contact springs 37. In a similar way to the odd Maltese wheel 7 is attached a horizontal arm 38, to which are mounted two insulating rails 39. To them are attached the same structurally odd contact lamellae 36 with contact springs 37. At their upper end, the insulating rails 35 are mounted by means of rods 40 to the uppermost even contact ring 29. bolt is mounted horizontal conductor 41, which passes into the vertical part 42 and with a new horizontal part 43 (Fig. 5) is connected to a known bushing act 44 of the oil tank 19. A ring 46 is mounted on the bottom 45 of the oil tank 19, to which the insulating cylinder 2 is attached. There are also known gears 47 on the bottom 45.

The pre-selector is located on the side and parallel to the dialer. The lower plate 48 of the pre-selector is attached to the bottom 1 of the dial. Two insulating columns 49 are mounted on it, on which fixed contact elements 50 of the pre-selector are fixed. Three L-shaped brackets 51 are mounted on the tubular insulating shaft 25, which carry movable contact slats 52 of the pre-selector. They alternately contact the fixed contact elements 50 and the upwardly extending contact part 53 connected to the even fixed contact elements 3.

In FIG. 5 shows a variant of the configuration of the outer conductors 41, 42 and 43. The horizontal part 41 is fixed in the radial direction by grooves made in the insulating cylinder 2. It is also possible that the part 41 is directed so as to avoid the horizontal part 43 .

The action of the elected and the pre-voter is as follows. Shaft 16 rotates the gear 15 in one revolution and through the gears 14 and 11 the double gear 9 rotates half a revolution. One of the Maltese wheels 6 or 7 is rotated alternately, moving the movable contact slats 36 of the adjacent fixed contact element 3 or 4. In the middle of the adjustment range roller 21 rotates the Maltese sector 22 at a certain angle and through the gears and gears 23 and 24 the tubular shaft 25 rotates 90 ° and switches the pre-selector contact system.

Claims (4)

1. Selector with pre-selector for stepped voltage regulator with isolated phases, comprising a Maltese gear of even and odd Maltese wheels and a double gear, a mechanism for actuating the double gear, a selector switching mechanism, floor-mounted even contact ring and odd contact ring each phase, there are two drive insulating shafts with movable contact lamellas, which connect the contact rings and the fixed contact elements attached in a circle to the insulating cage, the contact rings are connected to the contact elements of the oil vessel by external wires, and a pre-selector is installed lateral to the dialed, characterized in that the Maltese gear and other mechanisms are mounted on the metal bottom (1) of the dialed, and on the metal column (5) are mounted one even Maltese wheel (6) and one odd Maltese wheel (7) , and parallel to column (5) there is another column (8) on which a double translation (9) is mounted with two drive rollers (10), at the top of the column (5) is attached an insulating disk (26) supporting an insulating tube (27) reinforced at its upper end by a larger insulating disk (32) attached to a supporting insulating cylinder (2), externally to the insulating pipe (27) are mounted one even contact ring (28) and one odd contact ring (29) for each phase (X, Y, Z), to each contact ring (28, 29) by means of current-carrying brackets 30) are connected wires (31), which pass vertically inside the pipe (27) and are reinforced in their upper part by insulating plates (33) to the insulating ring (32), and the upper ends of the wires (31) are connected to contact elements (44) of the oil pan (19) by horizontal conductors (41, 43) and vertical outer conductors (42), also the even Maltese wheel (6) carries a horizontal arm (34) connected to vertically arranged insulating rails (35) with contact lamellas (36) connected to them, connecting the contact rings (28) with even neps movable contact elements (3) mounted on an insulating cylinder (2) and similarly the odd Maltese wheel (7) carries a horizontal arm (38) connected to insulating rails (39) with contact lamellas (36) connecting the contact rings (29) ) with odd fixed contact elements (4) mounted on the insulating cylinder (2). Selector with pre-selector for step voltage regulator according to Claim 1, characterized in that the upper end of the even insulating rails (35) is connected to a splined element (40) which, in addition to carrying the contact slats (36), it also serves for bearing to the contact ring (28) of phase X and in a similar way at the upper end of the odd insulating rails (39) is connected to a branch-like element (40), which besides carrying the contact lamellas (36) also serves for bearing to the contact ring (29) of phase X. 3. Selector with pre-selector for step voltage regulator, according to claims. 1 and 2, characterized in that on the column (8) under the double translation (9) is mounted a gear wheel (11) connected to it by a freewheel connector (12) and engaged with a parasitic gear wheel (14), which on the other hand it is engaged with a gear wheel (15), and this gear wheel rotates one turn of the insulating shaft (16) coupled (17) with the insulating shaft (18) of the oil vessel (19). Selector with pre-selector for step voltage regulator according to claims 1, 2 and 3, characterized in that a disk (20) with a roller (21) is attached to the odd Maltese wheel (7), which interacts functionally with the Maltese sector of a two-arm element (22) with a gear sector on the other side engaged with a parasitic gear wheel (23) connected to an insulating tubular shaft (25) by a gear wheel (24), the tubular shaft (25) being coaxially mounted on the shaft (16) and carries three L-shaped brackets (51) with contact lamellae (52) which contact the contact (53) connected to the fixed contact (3) and fixed contact elements (50) of the pre-selector, and these contact elements are mounted on vertical insulating columns (49).