BG67538B1 - Selector with preselector for step voltage regulator with isolated phases - Google Patents

Abstract

The selector according to the present invention has a load-bearing structure consisting of a bottom (1), an insulating cylinder (2) and an insulating disc (32). On the bottom there is a metal column (5) which carries via bearings an even Maltese wheel (6) and an odd Maltese wheel (7). A parallel metal column (8) carries via bearings a double shifter (9) with two drive rollers (10). An insulating disc (26) is attached to the top of the column (5) and carries an insulating tube (27) fixed at its upper end to a disc (32). Mounted on the external side of the tube (27) are even and odd contact rings (28, 29). The even Maltese wheel (6) has a radial arm (34) which carries vertical insulating rails (35) with contact lamellas (36) which connect the even contact rings (28) to even fixed contacts (3) mounted on the cylinder (2). The arrangement of the elements (38, 39) which connect the odd contact rings (29) and the odd contacts (4) is similar. Inside the tube (27) there are conductors (31) which are connected to the corresponding contact rings (28, 29) by metal brackets (30) and the upper parts of which are fixed by insulating plates (33) to the disc (32). The conductors are connected to pass-through contacts (44) of an oil pan (19) by horizontal (41) and vertical (42) conductors. The double shifter (9) is driven by a vertical insulating shaft (16) coupled to a shaft (18) of the oil pan (19) by cogwheels (15, 14, 11). L-shaped carrying elements (51) of contact lamellas (52) of a laterally arranged preselector are fixed on an insulating tube (25) which rests on bearings concentrically to the shaft (16). Said tube is turned to 90 degrees by the following train of elements: a disc (20) with a roller (21), a double-arm element (22), a cogwheel (23) and a cogwheel (24).

Description

(54) SELECTOR WITH PRE-SELECTOR FOR VOLTAGE STEP-UP REGULATOR WITH ISOLATED PHASES

Field of technique

The invention relates to a selector with a pre-selector of a step regulator, which is incorporated in power transformers with voltage regulation under load. Through the selector, no-load deviations of the regulation winding of the transformer are switched, and the pre-selector doubles the number of steps. Selectors of step regulators with regulation in a star center have relatively compact and small-sized structures. Selectors of step regulators with isolated phases have complicated constructions and have significantly larger overall dimensions. This applies mostly to step regulators for large rated currents.

Prior art

A selector with pre-selector for step voltage regulator /1/ is known, containing a cage of insulating columns secured between an upper housing with mechanisms and a round bottom. Mounted in the housing is a drive gear, a Maltese gear of even Maltese wheel, odd Maltese wheel and double translation, and a preselector actuation mechanism. The three phases are arranged one below the other. Each phase has a certain number of even and odd fixed contact elements mounted in two levels on the insulating columns. An even contact ring and an odd contact ring for each phase are staggered in the middle of the cage. The rings are connected to current-carrying brackets that fasten them to the insulating columns. Inside the rings is an even drive isolation shaft connected to the even Malt wheel and an odd drive shaft connected to the odd Malt wheel. A horizontally located even movable current-carrying contact assembly and an odd movable current-carrying contact assembly are gripped on the drive insulating shafts, which alternately contact the stationary contact elements. Flexible insulated wires are connected to the outer faces of the current-carrying consoles, which are connected to the output contacts of an oil pan located above the selector. The pre-selector is located on the side of the selector and has two fixed contact elements and a movable contact assembly.

A disadvantage of this selector with preselector is that it is complex in construction and has large overall dimensions and weight. A 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 regulation winding of the transformer.

Technical essence of the invention

The task of the invention is to create a selector with a preselector of a step regulator with isolated phases, which has a simplified construction and has small overall dimensions and weight. Also no connecting wires around the selector.

The task is solved by a selector with a preselector for an isolated phase step voltage regulator, containing a Maltese gear of even and odd Maltese wheels and double translation, a mechanism for actuating the double translation and a mechanism for switching the preselector. An even contact ring and an odd contact ring are staggered in the center of the selector, one for each phase. There are also two driving insulating shafts with movable contact plates that make a connection between the contact rings and fixed contact elements fixed circularly to an insulating cage. The contact rings are connected to the contact elements of the oil pan by externally located wires around the selector. The pre-selector is installed on the side of the selector.

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 supported on a metal column attached to it. A second metal column is located parallel to the first metal column, on which a double translation with two drive rollers is mounted. Attached to the top of the first metal column is an insulating disc carrying an insulating tube, which is secured at its upper end to a larger insulating disc clamped to a supporting insulating cylinder. One even contact ring and one odd contact ring for each phase are mounted externally to the insulating tube. Conductors are connected to each contact ring through current-carrying consoles, which pass vertically inside the tube and are strengthened at their upper end to the large insulating ring by means of insulating plates. A horizontal radially directed wire is bolted to the upper face of each wire, which runs in a vertical direction and connects to a known oil pan contact. The horizontal part of the wires is fixed in grooves made on the supporting insulating cylinder. The distance between the conductors, the contact rings and the bottom of the oil pan are coordinated to provide the necessary interphase isolation. Attached to the even Maltese wheel is a horizontal arm connected to vertically positioned insulating slats. Contact lamellae are attached to them, connecting the contact rings with even fixed contact elements mounted on the insulating cylinder. Likewise, the odd Maltese wheel carries a horizontal arm connected to insulating rails with contact strips mounted thereon connecting the contact rings to odd fixed contact elements mounted on the insulating cylinder. The upper end of the even insulating bars is connected to a felt element which, in addition to carrying contact lamellae, also serves as a bearing to the even contact ring of phase X. Similarly, the upper end of the odd insulating bars is connected to a felt element which, in addition to that carries contact plates, also serves as a bearing to the odd contact ring of phase X. On the column under the double translation is a gear bearing, connected to it by a freewheel clutch. This gear is meshed with a spur gear, which on its other side is meshed with a third gear rotated one shift revolution by a vertical isolation shaft coupled to an isolation shaft on the stepper oil pan. Attached to the odd Maltese wheel is a disc with a roller, which functionally interacts with a Maltese sector of a two-arm element bearing on the column of the double translation. On the other arm of the two-arm element there is a toothed sector meshed with a spur gear, which on its other side meshes with another gear connected to an insulating tube shaft. This shaft is mounted coaxially to the drive isolation shaft. On it are caught three L-shaped carriers with contact plates fixed on them, which contact contacts connected to the even fixed contact elements and fixed contact elements of the preselector. These contact elements are mounted on vertical insulating columns.

An advantage of the selector with preselector for a voltage step regulator according to the invention is that it has a simplified construction and reduced overall dimensions. There are no external wires that increase the cross-sectional dimensions and interfere with the connection of the wires from the regulation winding of the transformer. It is also an advantage 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 preselector, showing its connection to an oil pan with a power switch.

figure 2 - cross-section (A-A) of the Maltese gear and drive gears;

figure 3 - cross-section (B-B) of the mechanisms for actuating the pre-selector;

figure 4 - cross-section (C-C) through the contact systems of the selector and the pre-selector; figure 5 - arrangement of the connecting wires between the selector and the oil pan.

Examples of implementation of the invention

It is characteristic of the new selector design that the Maltese gear and other mechanisms are not above the contact systems, but below them at the bottom of the selector. This makes it possible for 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 pipe segments to facilitate assembly. Even fixed contact elements 3 and odd fixed contact elements 4 for each phase X, Y, Z are mounted on the insulating cylinder 2. A circular metal column 5 is attached to the middle of the bottom 1, on which an even Maltese wheel 6 and odd Maltese wheel 7. Parallel to the column 5, there is a second stationary column 8, on which a double translation 9 with two drive rollers 10 is mounted. They alternately interact with the two Maltese wheels 6 and 7. The double translation 9 is driven by a gear wheel 11, which is mounted below it on the column 8 and is connected to it by a known coupling 12 with free movement. It ensures that when reversing the movement, there is no selection of a new step, only switching of the power switch. A third metal column 13 is also mounted to the bottom 1, on which a gear wheel 14 is mounted, which is connected on one side with the gear wheel 11 and on the other side - with the gear wheel 15. This gear wheel rotates one revolution of switching from a vertical isolation shaft 16, which is connected by a coupling 17 to a known isolation shaft 18 of an oil pan 19. The drive of the pre-selector is done by a disc 20 with a roller 21 connected to the odd Maltese wheel 7. Above the column 8 is a two-armed element 22, which on one side there is a Maltese sector connected to the pulley 21 and on the other side there is a toothed sector meshed with a gear 23 bearing on the column 13. This gear is connected to a smaller gear 24 which rotates 90 ° tubular insulating shaft 25 mounted coaxially on the shaft 16. On top of the column 5 is caught an insulating disk 26, which carries an insulating pipe 27. Coaxially on the pipe 27 are mounted an even current-carrying disk 28 and an odd current-carrying disk 29, one for each phase. One vertical round wire 31, for example, made of copper, is attached to each disk through a current-carrying bracket 30. The pipe 27 is fixed at its upper end with an insulating disk 32 attached to the insulating cylinder 2. By means of insulating plates 33 clamped to the disk 32, the upper ends of the wires 31 are strengthened. A horizontal arm 34 is clamped to the even Maltese wheel 6, to which they are mounted two insulating slats 35. The even movable contact lamellas 36 with contact springs 37 are attached to them. In a similar way, a horizontal arm 38 is attached to the odd Maltese wheel 7, to which two insulating slats 39 are mounted. contact lamellae 36 with contact springs 37. At their upper end, the insulating bars 35 are supported by means of pins 40 to the uppermost even contact ring 29. In the same way, the odd insulating bars 39 are also supported by means of pins 40. At the upper end of the wires 31 by bolt, a horizontal wire 41 is installed, which passes into a vertical part 42 and with a new horizontal part 43 (fig. 5) is connected to a known through contact 44 of the oil container 19. A ring 46 is mounted on the bottom 45 of the oil container 19, to which the insulating cylinder 2 is attached. To the bottom 45 there are known toothed gears 47.

The pre-selector is located laterally and parallel to the selector. Attached to the bottom 1 of the selector is the bottom plate 48 of the pre-selector. Two insulating columns 49 are mounted on it, on which fixed contact elements 50 of the pre-selector are attached. Three L-shaped carriers 51 are mounted on the tubular insulating shaft 25, which carry movable contact plates 52 of the preselector. They alternately contact the fixed contact elements 50 and the upwardly extended contact part 53 connected to the even fixed contact elements 3.

In fig. 5 shows one variant of the configuration of the outer wires 41, 42 and 43.

The horizontal part 41 is fixed in a radial direction by grooves made in the insulating cylinder 2. A variant is also possible in which the part 41 is directed so as to avoid the horizontal part 43.

The action of the selector and pre-selector is as follows.

The shaft 16 rotates the gear wheel 15 by one revolution and through the gears 14 and 11 the double translation 9 is rotated by half a revolution. One of the Maltese wheels 6 or 7 is rotated alternately, which moves the movable contact lamellae 36 of the adjacent stationary contact element 3 or 4. In the middle of the adjustment range, the roller 21 rotates the Maltese sector 22 at a certain angle and through the gear sector and gears 23 and 24 the tubular shaft 25 is rotated 90° and switches the contact system of the preselector.

Claims (1)

Selector with preselector for isolated phase step voltage regulator, containing Maltese gear of even and odd Maltese wheels and double translation, double translation actuation mechanism, preselector switching mechanism, staggered even contact ring and odd contact ring for each phase , there are also two driving insulating shafts with movable contact lamellae which make a connection between the contact rings and the fixed contact elements fixed circularly on an insulating cage, the contact rings being connected to the oil pan contact elements by externally located wires, and a pre-selector is installed laterally of the selector, characterized in that the Maltese gear and other mechanisms are mounted on the metal bottom (1) of the selector, with one even Maltese wheel (6) and one odd Maltese wheel (7) bearing on the metal column (5), and parallel to column (5) there is another column (8) on which a double translation (9) with two drive rollers (10) is mounted, an insulating disk (26) carrying an insulating tube (27) is fixed on top of the column (5) ), strengthened at its upper end on a larger insulating disc (32), clamped to a supporting insulating cylinder (2), and externally to the insulating tube (27) one even contact ring (28) and one odd contact ring are mounted (29) for each phase (X, Y, Z), and wires (31) are connected to each contact ring (28, 29) through current-carrying brackets (30), which pass vertically inside the tube (27) and are strengthened in its upper part through 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) through horizontal wires (41, 43) and vertical external conductors (42), also the even Maltese wheel (6) carries a horizontal arm (34) connected to vertically arranged insulating rails (35) with fixed contact lamellae (36) connecting the contact rings (28) with even fixed 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 established on them contact lamellae (36) connecting the contact rings (29 ) with odd fixed contact elements (4) mounted on the insulating cylinder (2)