BG62748B1 - Three-phase selector of a stepping voltage regulator - Google Patents

Abstract

The selector is designed for selection by working shifts of the tappings of the regulation winding of a power transformer and together with a power switch they ensure the voltage regulation under load. It has a simplified and compact structure, reduced overall dimensions, weight and cost having firm fixation of its components and reduced force during its moving. Even (4) and odd (5) number of fixed contact elements are mounted in tiers on a cage of insulation columns (3) and insulation rings (6). In the centre of the selector an even number insulation driving shaft (9) connected to an even number Maltese wheel (16) and supporting three even number current collector rings (23), and an odd number insulation driving shaft (10) connected to an odd number Maltese wheel (17) and supporting three odd number current collecting rings (28) are fitted. The rings have radial arms (24, 29) with a thickness smaller than theirs. On one of the sides of the radial arms mobile contact bridges (27, 30) are mounted which, by means of contact springs (25) are resting on one of the sides of rings (23) 28) and on their respecitve contact elements (4, 5). One radial current collecting cross-bar (7) being thinner than the rings (23, 28) is fixed at each tier, on their level to the insulation rings (6). Current collecting plates (31, 32) are fitted on the radial cross-bars which get into contact on the other side of rings (23, 28). In an option of the selector all the six current collection rings are mounted only on one centrally resting insulation driving shaft, and the mobile contact bridges have arc-like shape in their peripheral part. The fixed components (4, 5) can have contact rollers in order to reduce the force during the movement of the contact bridges. 4 claims, 5 figures

Description

Technical field

The invention relates to a three-phase selector of a step-by-step voltage regulator, intended for the written connection of the deviations of the windings of load-adjustable power transformers with different control schemes.

BACKGROUND OF THE INVENTION

From 25353 BG, there is a known three-phase step regulator of voltage regulator comprising stacked even and odd fixed contact elements on insulated columns in cylindrical cage connected between the upper shield and the lower shield. In the center of the cage there are insulating drive shafts around which are arranged stacked floor drainage rings. These rings are secured to the insulation columns by D-shaped current collecting elements. The discharge rings and the fixed contact elements are functionally connected by movable conductive bridges, each consisting of two contact plates, contacted by contact springs on both sides of the discharge rings and the fixed contact elements. The movable conductor bridges are mounted by means of D-shaped supports to the insulating drive shafts.

The disadvantage of this three-phase selector is that it has a relatively complex construction and large dimensions, weight and cost, especially at the most commonly used rated currents (eg up to 400A). The disadvantage is that the reinforcement of the power outlet rings is largely unstable.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a three-phase selector of a step regulator of voltage with a simple and light construction, with small dimensions and cost and with the possibility of uniform application, both in star-centered and triangular control circuits.

The problem is solved with a three-phase selector of a step voltage regulator, containing even and odd fixed contact elements arranged on a cylindrical insulating cage, connected by means of movable contact bridges arranged in a cage within the cage, which encircle the axial shafts. According to the invention, each tachograph is attached to an insulating drive shaft and has a radial arm with a thickness less than the thickness of the ring. The movable contact axle is mounted unilaterally on the radial arm and through the contact springs is contacted only on one side of the so-called sealing ring and the corresponding fixed contact element. On the insulating cage, at the level of the discharge ring, is a radial discharge carrier. less than the thickness of the ring. To this carrier is mounted unilaterally tocol ^_ ay plate contacting the other side of the current conduction ring.

In a preferred embodiment, the fixed contact member may have a contact bar.

In another embodiment, three of the current drive disks are secured to an insulating drive shaft and the other three drive disks are secured to a second insulating drive shaft.

In another preferred embodiment, all six drive disks are secured to an insulating drive shaft, and the drive bridges are arched in their peripheral portion.

An advantage of the three-phase step regulator selector according to the invention is that it has a simplified and compact current conduction system, which reduces the overall dimensions, weight and cost of the product and improves assembly accuracy and element stability. The advantage is that, thanks to the contact rollers, effort is reduced when moving the contact bridges.

Explanations of the annexed figures

An exemplary embodiment of the three-phase step regulator selector according to the invention is shown in the accompanying figures, of which:

Figure 1 is a longitudinal section of the MM through a three-phase selector with two insulating drive shafts;

FIG. 2 is a cross-sectional view through the selector of FIG. 1;

3 is a longitudinal sectional view through a selector with one insulating drive shaft;

4 is a cross-sectional view through the selector of FIG. 3;

Figure 5 is a section through enlarged contact elements.

Examples of carrying out the invention

Between the upper shield 1 and the lower shield 2 / FIG. 1, FIG. 2) insulating columns 3 are arranged in a cylindrical cage, in this case shaped as parts of an insulating cylinder, but could be in another known embodiment. The even 4 and odd 5 fixed contact elements of the three phases A, B and C. are mounted on the insulation columns 3. Each floor has one insulation ring 6, which gives stability to the insulation casing and carries one radial current carrying bracket 7. In addition through the fixed contact elements 4 and 5, the connection between the insulating columns 3 and the insulating rings 6 can also be strengthened with insulating bolts 8. In the center of the selector there is an even insulating drive shaft 9 for even contacts and an insulating drive shaft 10 for non even contacts. The shafts 9 and 10 are mounted to the axis 11 of the lower shield 2 through the arms 12 and 13, and at the upper shield 1 are connected through the arms 14 and 15 to the Maltese wheel 16 for even contacts and the Maltese wheel 17 for odd contacts. The Maltese wheels 16 and 17 are actuated in a known manner by a double translation 18 with rollers 19. The freewheel clutch 20 is coupled with an unknown power switch not shown. To the insulating actuator shaft 9, through the clamps 21 and bolts 22, are attached three even current-collecting rings 23 with radial arms 24. To these arms, through the pins 25 and contact springs 26, an even movable contact bridge 27 is mounted, which contacts one-sidedly. the discharge ring 23 and the corresponding fixed contact element 4. The contact bridge may consist of one or more contact plates of different design. In the same way, the odd insulating drive shaft 10 is fitted with three odd current-collecting rings 28 with radial arms 29, to which odd movable contact bridges are mounted 30. On the radial current-carrying carriers 7 are mounted even 31 and odd 32 current-withdrawing plates, which detach contact current plates the side of the drainage rings 23 and 28. The thickness of the radial arms 24 and 29 and the radial drainage brackets 7 is so selected that, when rotating the contact bridges 27 and 30, a discrepancy is achieved, although eye-carriers 7 are flush with the corresponding fixed contact elements 4, respectively 5. To the radial current-carriers 7, wires 33 are connected, which go to an unpowered power switch. In FIG. 2 with Al, B1 and C1 denote the odd leads and A2, B2 and C2 the even leads. The terminals of the three phases are shifted for easy connection with the power switch. It should be borne in mind that in section KK the pin A2 is represented displaced under pos. 29, and conclusion A1 under pos. 27.

In FIG. 3 and FIG. 4 shows only phase A of a selector with one insulating drive shaft 34, on which all six drainage disks 35 are secured by pins 36. The other two phases B and C are of the same construction. The positions of the same-purpose elements are the same as those of FIG. 1 and FIG. 2. The implementation of the movable contact bridges 37, which are arched in their peripheral portion 38, is different. The Maltese wheel 39 is only one. Terminals A1, B1 and C1, respectively A2. B2 and C2 are grouped, which may be a better option in the presence of a known preselector not shown in the figures.

In FIG. 5 is an enlarged embodiment of a fixed contact element 4, respectively 5, with a contact neck 40 and a contact roll 41, which reduces the effort of switching the contact bridge 27 on and off respectively, 30. The contact roll is fixed by a nut and a saw 42. The fixed contact element 4, respectively 5, is clamped to the insulation column 3 by means of a nut 43. The contact spring 26 is limited to the pin 25 by a washer 44.

The operation of the three-phase selector of the step regulator of voltage is as follows: The power switch maintains an electrical circuit through the terminal 33, the radial drainage bracket 7, the even current collecting plate 31, the even current collecting ring 23, 5 even the movable contact bridge 27 and the corresponding contact element 27 and the corresponding element , the contacts of the power switch interrupt the odd current circuit through the elements of positions 33, 7, 32, 27, 30 and 5. 10 Therefore, after turning the double translation 180 °, the odd Maltese wheel 17 and the odd insulating shaft 10 moves the non-current odd moving contact bridge 30 to the adjacent selected odd fixed contact element 5. At the end of the cycle, the power switch in a known manner transfers the load from the even to the odd electrical circuit under load. In the next cycle, the next 20 even deviation is selected in the same way and the power switch transfers the current to it. This traverses the entire adjustment range. In the single-shaft selector / fig. 1, FIG. 2 / The contact bridges move simultaneously, but the arched ends 38 25 maintain the current circuit in a known manner.

Claims (4)

Claims 1. Three phase phase selector pen ⁷ - 30 voltage generator containing stacked floors on cylindrical insulating casing / 3, 6 / even / 4 / and odd / 5 / fixed contact elements connected by movable contact bridges / 27, 30 / s arranged in a row inside a cage cage (23, 28) enclosing axially arranged insulating drive shafts (9, 10), characterized in that each discharge ring (23, 28) is secured to an insulating drive shaft (9) , 10 / and has a radial arm (24, 29) with a thickness less than the thickness of the ring, such as the main contact bridge (27, 30) is mounted unilaterally on the radial arm (24, 29) and through contact springs (25) is contacted only on one side of the discharge ring (23, 28) and the corresponding fixed contact element (4, 5). /, and on the insulation casing (3, 6), at the level of the current collecting ring (23, 28), a radial current collecting carrier (7) with a thickness smaller than that of the ring containing a current collecting plate (31,32) is gripped, which contacts the other side of the discharge ring (23, 28). A three-phase step regulator selector according to claim 1, characterized in that the fixed contact element (4,5) has a contact roll (41). 3. Three-stage selector of the step controller according to claims 1 or 2, characterized in that three of the current drive disks (23) are attached to one insulating drive shaft (9) and the other three current drive disks (28) are secured to a second drive shaft / 10 /. A three-phase step-regulator selector according to claim 1 or 2, characterized in that the six drive-out discs (35) are fixed to one insulating drive shaft (34) and the current-carrying bridges (37) are arched in their peripheral part / 38 /.