BG112081A - THREE-PHASE VOLTAGE VOLTAGE VOLTAGE CONTROLLER - Google Patents

Abstract

The tri-phase stepped regulator has an oil vessel, comprised of a carrier head (1), isolation cylinder (4) and bottom (5). In the carrier head is placed a spring-energy accumulator, containing starting gear pair (10-14), shoulder (16) with switching thumb (17), joint with free movement (18) and switching spring (20). The tooth gear (14) and shoulder (16) are hinged to drive (15) with gear (22). The drive is hinged on carrier flange (13). To the lower end of the drive (15) is mounted a switching isolation cylinder (25), which carries movable contact systems of the three phases. They are placed 120 degrees from each other and are isolated from one another. On the internal surface of the isolation cylinder (4) are mounted the stationary contact elements (3), the electrical energy outlet (37) and resistors (33). Two variations of the movable rolling rolls (26, 27) can be used. There is also a variation with vacuum finger arch chambers.

Description

THREE-PHASE STEP VOLTAGE REGULATOR WITH

INSULATED PHASES

FIELD OF THE INVENTION

The invention relates to a three-phase step controller with isolated phases, designed to regulate the voltage under load of power transformers with windings connected in a triangle.

BACKGROUND OF THE INVENTION

A three-phase step voltage regulator with isolated phases (1) is known, comprising an oil vessel consisting of a support head, an insulating cylinder and a bottom. On the inner surface of the insulating cylinder are located fixed contact elements, which for the three phases are arranged in floors with insulation between them. The movable contact elements are rollers connected to

vertical insulation pipe. Resistors are mounted next to them. The insulation pipe is coupled with a spring energy accumulator placed in the support head. The disadvantage of this three-phase step regulator is that the electrical wear from the arcs of the contact elements is uneven, and the fixed contacts are difficult to access for inspection and repair. Another disadvantage is that the assembly and disassembly of the removable part is difficult. Another disadvantage is that there is no interchangeable version with vacuum arc chambers (VDK).

A three-phase step controller (2) is also known, which has a separate power switch with three phases spaced 120 ° apart in a horizontal direction. Each phase contains fixed contact elements clamped to insulating sectors, movable contact elements and resistors located above them. Below the three phases there is a common spring-energy accumulator. The power switch is mounted in an oil tank.

The disadvantage of this three-phase step regulator is that it has very large dimensions and weight. The construction is expensive and takes up a lot of space in the transformer boiler.

SUMMARY OF THE INVENTION

The object of the invention is to provide a three-phase step voltage regulator with isolated phases, comprising an oil vessel composed of an insulating cylinder with a guide head and a bottom. A three-phase power switch with isolated phases is located in the oil tank. The fixed contact elements of the power switch are mounted on the inner surface of the insulating cylinder. The resistors are also attached to them.

The movable contact units are connected by insulating elements with a spring-energy accumulator.

According to the invention, the spring-energy accumulator has a drive gear, performing half a turn of the switch, connected by a rod to another gear, which oscillates within a certain angle at each switch. This gear is engaged with a smaller gear that is mounted on a shaft mounted in the middle of a bearing flange. The small gear is functionally connected by a freewheel clutch with a arm also mounted on the shaft. The arm has a switching pin and an axis to which one end of the switching spring is attached. The other end of the spring is connected to a fixed frame mounted on the bearing flange. The shaft has a switching rocker, which interacts with the switching pin during switching. A switching insulating cylinder is attached to the lower end of the shaft, to which the movable contact systems of the three phases are mounted.

On the insulating cylinder of the oil vessel, at 120 ° for each phase, there is one odd fixed main contact, one even fixed main contact and between them - one odd auxiliary fixed contact and one even auxiliary fixed contact. The movable contact system consists for each phase of a U-shaped support attached to the drive insulating cylinder. At one end of the carrier there are contact rollers rolling on the fixed contacts, and at the other end there is a current-carrying contact unit, sliding on a contact arc with a terminal. There are two options. In variant I, the rollers have a horizontal axis of rotation. They are two pairs, but only one pair with a larger roller diameter can be used. In this case, vibrations are more likely to occur. In option II

4 ::. :: .. ·;

• · ··· · · ·· · _β rollers have a vertical axis of rotation. They are two mounted next to each other, but it is possible to use only one roller with a larger diameter, so as to achieve a smoother switching.

An interchangeable version with vacuum arc suppression chambers (VDC) can also be used. A main contact arc and an auxiliary contact arc are attached to two terminals (even and odd). A plastic bracket is attached to the insulating cylinder above the arches. One main VDK and one auxiliary VDK are mounted to it by means of bearing metal heads. On the outer arcs there are interruptions located against the respective VDK. There are also two internal arches. The main external and internal arcs are connected to a main contact bridge, which is located on a bracket mounted on the switching insulating cylinder. In the same way, two auxiliary arcs are connected by an auxiliary contact bridge. The movable contact elements of VDK have a drive system consisting of an L-shaped lever with a roller. During the abrupt rotation of the drive cylinder, the cam mounted to it interacts with the roller and switches off the corresponding VDK, so that the interruption of the arcs is passed by the contact bridges without current flowing through them.

The advantage of the three-phase step regulator is that it has a simple construction with small dimensions. Another advantage is that there is an interchangeable version with VDK. The advantage is that the removal and reassembly of the removable part is very easy.

EXPLANATION OF THE ATTACHED FIGURES

An exemplary embodiment of the three-phase step controller with isolated phases according to the invention is shown in the attached figures, of which:

* 5 / λ *:: * ’’

Figure 1 is a longitudinal section of the oil pan and the power switch mounted therein.

Figure 2 - longitudinal section through the mechanism loading the switching spring.

Figure 3 - top view of the switch rocker.

Figure 4 - top view of the spring-energy accumulator.

Figure 5 - cross section of the contact system in two variants: I - with contact rollers with horizontal axis of rotation; II - with contact rollers with vertical axis of rotation.

Figure 6 - longitudinal section of a power switch with vacuum arc quenching chambers.

Figure 7 is a cross-sectional view of the power switch of fig. 6.

EXAMPLES OF EMBODIMENT OF THE INVENTION

The oil container consists of a support head 1, with a flange 2 and a lid 3, an insulating cylinder 4 and a bottom 5 (Fig. 1). The actuators and the spring-energy accumulator are located in the support head.

The movement from an unknown motor drive is transmitted to an input shaft, which is connected to a worm gear 7. It performs one gear shift by rotating a gear 9 through a gear 8, which makes half a gear shift (Fig. 2, fig. 4). A connection is made between the gear 9 and the gear 10 by means of a rod 11. Thus, with each half turn of the gear 9, the gear 10 makes successive rotations at a certain angle in a clockwise and counterclockwise direction. Gear 10 is mounted on an axle 12 mounted on a flange 13. It is engaged with a gear

14, mounted on a shaft 15, on which is mounted also an arm 16 with a switching pin 17. The connection between the gear wheel 14 and the arm 16 is made by a clutch 18 with a free stroke. To the arm 16 of the axle 19, extension of the thumb 17, is attached one end of a switching spring 20, the other end of which is attached to a fixed frame 21 mounted on the flange 13. The shaft 15 has a rocker 22 which rotates abruptly with each switch at a certain angle in one direction or the other. The strokes at the end of the switch are absorbed by the buffers 23.

At the lower end of the shaft 15 is mounted a flange 24 connected to a vertical insulating cylinder 25 (Fig. 1, Fig. 5). Two options are presented:

I - the contact rollers 26 have horizontal axes of rotation.

II - the contact rollers 27 have vertical axes of rotation.

An even 28 and an odd 29 main fixed contact element with terminals 30 outside the cylinder 4 are mounted on the insulating cylinder 4. The auxiliary fixed contact elements 31 and 32 are arranged between them. The designations are the same for lime. I and var. II, although there is a difference in design. Resistors 33 are located below the fixed contact elements. They are connected in a certain way between the main and its corresponding auxiliary contact element.

The movable contact system is attached to the insulating cylinder 25. It consists of a U-shaped carrier 34, at one end of which are the contact rollers 26, resp. - 27, and at the other end there is a current-carrying contact unit 35 in contact with the contact arc 36. It has a terminal 37. The contact units have known contact springs 38 and 39.

The worm wheel 7 is connected in a known manner to a vertical insulating shaft 40, which at its lower end is connected to a known gear 41 (Fig. 1), which makes the connection with a known selector. Fig. 4 shows a disc 42 for indicating the positions and locking 43, which are known and not relevant to the invention.

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Fig. 6 and Fig. 7 show a variant of a power switch with vacuum arc quenching chambers (VDK).

A plastic bracket 46 is fixedly mounted between the odd 44 and even 45 terminals of the power switch. A main VDK 47 and an auxiliary VDK 48 are mounted on it by means of metal brackets 49. A main contact arc 50 and an auxiliary contact arc 51 are attached to the two terminals 44 and 45. These arcs have an interruption 52 at the radius of the respective VDK.

Opposite the arcs 50 and 51 are internal arcs 53 and 54, respectively. The arc 53 is connected to the bracket 49 of the main VDK 47 and contacts the outer arc 50 via the contact bridge 55. The arc 54 is attached to the plastic bracket 46. Between this arc and the bracket of the auxiliary VDK 48 is connected a resistor 33. The two arcs 51 and 54 are connected by a contact bridge 56. The two contact bridges have supports 57 which are attached to the insulating cylinder 25. The movable contacts 58 of the VDK are switched off and on in a known manner by G -shaped lever 59 with a roller 60 actuated by a cam 61 mounted to the insulating cylinder 25. These elements and the contact spring 62 are arranged in a metal support 63 with a terminal 64.

The operation of the three-phase step controller is as follows:

From the worm gear 7, the gear 8 rotates one shift turn, and from it the gear 9 performs half a turn of the shift. In this case, the rod 11 rotates the gear wheel 10 at a certain angle sufficient to rotate the gear wheel 180 ° 14. From it, through the freewheel clutch 18, the arm 16 rotates as the switching spring 20 is tensioned. After the axle 19 has passed the dead center, the spring is released and the pin 17 acts on the rocker 22 and the insulating cylinder 25 rotates abruptly at an angle, for example 60 °, and the movable contact rollers 26, resp. 27 the fixed contact elements 29, 32, 31 and 28 are traversed in succession. The known switching scheme, called "flag", is realized. The reverse switching is done in the same way.

Switching in the variant with VDK (Fig. 6, Fig. 7) is as follows:

8 · ”:: *. : ’’ ·:

The contact bridges 55 and 56 begin to slide along the arcs 50 and 53, respectively along the arcs 51 and 54. At a certain angle before reaching the break 52, the cam 61 acts on the roller 60 and opens the respective VDK. Thus, the passage of the respective contact bridge 55 or 56 through the interruption 52 occurs when no current flows through them. The break 52 of the main contact arc 50 is against the main VDC 47, and that of the auxiliary contact arc 51 is against the auxiliary VDC 48.

The spring-energy accumulator in the support head and the movable contact system can be removed for inspection from the oil container by releasing the support flange 13 from the fixing bolts, turning it at a certain angle and pulling it with a tap in a known manner.

Claims (4)

PATENT CLAIMS A three-phase stepped voltage regulator with isolated phases, comprising an oil vessel consisting of a support head, an insulating cylinder and a bottom, a spring-energy accumulator, a movable contact system with resistors and fixed contact elements mounted on the inner surface of the insulating cylinder. that a drive gear (9) performing half a shift is connected by a rod (11) to a gear (10) engaged with a less loosely mounted shaft (15) gear (14), which is functionally connected by a freewheel clutch (18) with a shaft (15) mounted on the shaft (15) with a switching pin (17) and an axle (19) connected to one end of a switching spring (20), the other end of which is fixed of a fixed frame (21) mounted on a bearing flange (13), a shaft (15) is mounted in the center of this flange (13) and has a switching rocker (22) functionally connected to the thumb (15) and at the lower end of the shaft (15) is mounted switching insulating cylinder er (25), to which the mobile contact systems of the three phases are mounted. Three-phase step voltage regulator according to Claim 1, characterized in that an odd main fixed contact (29) and an even main fixed contact (28) with terminals are mounted on the insulating cylinder (4) for each phase located at 120 °. (30) outside the insulating cylinder (4), an odd auxiliary fixed contact (32) and an even auxiliary fixed contact (31) are established between them, and the movable contact system consists for each phase of a U-shaped carrier (34) attached to the insulating cylinder (25), at one end of which there are contacts 2 · ”:; \: * · *’ ·. ·· * · rollers (26) with horizontal axis of rotation for variant I or with contact rollers (27) with vertical axis of rotation for variant II, and at the other end there is a current-carrying contact unit (35) sliding on a contact arc 36) with conclusion (37). Three-phase step voltage regulator according to claims 1 and 2, characterized in that the contact rollers (26) are two pairs, but can also be one pair with a larger diameter, and the contact rollers (27) are two number, but can also be a number with a larger diameter, ensuring contact between two adjacent fixed contact elements. Three-phase step voltage regulator according to claim 1, characterized in that in a variant with VDK to the two terminals (44 and 45) a main contact arc (50) and an auxiliary contact arc (51) are interrupted (52) , above the outlets (44, 45) to the insulating cylinder (4) a plastic carrier (46) is mounted on one main VDK (47) and one auxiliary VDK (48), against arches (50, 51) internal arches are located (53, 54) connected to arcs (50 and 51) by contact bridges (55, 56), fastened by supports (57) to the insulating cylinder (25), the movable terminal (58) of VDK being connected to a lever (59) and a roller (60), which is periodically in contact with a cam (61) mounted to the insulating cylinder (25), and this whole drive system is housed in a metal support (63) with a terminal (64) attached to the insulating cylinder (4). Application: 7 figures