BG64809B1 - Preselector for step voltage regulator - Google Patents

Abstract

The preselector is used in power transformers for doubling the range of their regulation under load. It has simpler design with unified actuation elements, enabling its realization both as a side-positioned preselector, and as axially-positioned preselector under the selector. The actuation system of the preselector is mounted on the lower shield (3) of the selector. To the lower end of the even-number actuation isolation shaft (7) an arm (29) is fitted with a roller (30) which interacts with a Maltese sector (32) resting on bearings over shield (3). In case of a side-positioned preselector, selector (32) has a toothed sector (35) which, by means of another toothed sector (36) revolves the actuation isolation rack (23) of the mobile contact elements of the preselector. In case of a preselector positioned below, to the Maltese sector (32), an arm (40) is connected with roller (41) which revolves disc (43), connected to the mobile contact sectors (46) of the preselector.

Description

The invention relates to a selector selector for a step regulator, intended for regulation under load of power transformers.

BACKGROUND OF THE INVENTION

A pre-selector for a step regulator of voltage is known, comprising a drive mechanism located at the upper shield of the selector. The actuator consists of a shoulder with a roller attached to the even Maltese wheel of the selected and Maltese sectors, connected to a vertical insulating driven shaft on a lateral position of the selected selector [1].

The disadvantage of the known selector is that it can only be applied to the laterally located selector. This arrangement increases the lateral dimension of the foot controller. Therefore, in some cases, it is preferable for the selector to be located axially below the selector.

There is a known selector for a step regulator of voltage, comprising a drive mechanism located at the upper shield of the voter and consisting of a roller mounted on the Maltese wheel of the voter and a functionally linked gear lever. The actuator lever of the gear unit is mounted on an insulating drive shaft, which runs axially at the center of the selector and is connected to the contact system of the axially positioned under the selector selector [2].

Disadvantages of the described selector is its complex design and its limited application only for single-wave voter, which has major imperfections to the two-wave electorate.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a pre-selector for a step-type voltage regulator having a simplified actuator mechanism and having a uniform construction for both the lateral and axially pre-selected selector.

The problem is solved with a pre-selector for a step regulator of voltage comprising a drive mechanism composed of a roller arm and a Maltese sector connected to the movable contact system of the pre-picker, according to the invention the roller arm is mounted to the lower end of the vertical even drive shaft of the selector , and the Maltese sector is camped at the voter's lower shield. In the case of a lateral selector, the Maltese sector has a tooth sector engrained with another tooth sector connected to the insulating actuator rail of the movable contact elements of the selector. In the axially below the selector, the Maltese sector has a shoulder with a roller located in the radial groove of a disc bearing to the lower shield of the selector connected to the movable contact system of the selector.

The advantage of the pre-selector according to the invention is that with a simplified and uniform actuator, it can be realized both laterally and axially below the selector.

Explanation of the annexed figures

Exemplary embodiments of the preselector according to the invention are shown in the accompanying figures, of which:

Figure 1 is a longitudinal sectional view of a selector with a laterally arranged selector;

FIG. 2 is a cross-sectional view above the lower shield of the voter with the pre-selector of FIG. 1;

Figure 3 is a longitudinal section through an axially positioned pre-selector below the selector;

4 is a cross-sectional view through the pre-picker of FIG. 3.

Examples of carrying out the invention

The step selector selector (Figures 1 and 2) comprises a cage of arcuate insulating columns 1 secured between the upper carrier shield 2 and the lower carrier shield 3. Odd 4 and even 5 fixed contact elements are mounted on the insulating columns 1. In the center of the selected are arranged an odd drive insulation shaft 6 and an even drive drive insulation shaft 7. To the odd shaft 6 are attached three rings with queues 8, which carry movable odd contact elements 9. Accordingly, three rings with queues 10 are attached to the even shaft 7. which carry movable even contact elements 11. The odd drive shaft 6 is fixed to the upper shield 2 and is connected to an odd Maltese wheel 12. It is actuated by a double translation 13 via a roll 14. The odd drive shaft 7 is connected to an even Maltese wheel, respectively. 15, act WANO roll of 16.

The side-mounted pre-selector consists of an insulation sector 17 fixed between the upper carrier 18 and the lower carrier 19. The fixed contact elements 20 of the pre-selector are known in a known manner on the insulating sector 17. The movable contact elements 21 of the pre-selector are carried by the supports 22 of the actuating insulating rail 23. The latter is supported by the upper arm 24 and the lower arm 25 to the upper carrier 18 and the lower carrier 19.

An axis 26 is fixed in the center of the lower shield 3, on which the lower end of the odd drive shaft 6 is fixed by a shoulder 27 and the lower end of the even drive shaft 7 by a ring 28 is attached to the lower end of the shaft 7 by a roll 30 which interacts with channel 31 of the Maltese sector 32. The latter is supported by an axis 33 towards the lower shield 3. The Maltese sector 32 has a tooth sector 34 which is engaged with another tooth sector 35 which is fixedly connected to the lower arm 25.

In the variant of the axially located pre-selector (Figures 3 and 4), the repeated positions of the identical elements are indicated by the same numbers. The arcuate insulation columns 1 and the drive insulation shafts 6 and 7 are extended. An insulating ring 36 is mounted on the inside of the insulation columns 1, on which the fixed contact elements of the selector are mounted: at the common terminal 37, at the "plus" 38 and "minus" 39. The bearing of the drive shafts 6 and 7 is the same as FIG. 1. In the same way, the arm 29 interacts via the roll 30 with the Maltese sector 32. Instead of the tooth sector 34, as in FIG. 2, another arm 40 with a roll 41 is attached to the arm 29, which is located in the radial groove 42 of the disk 43. The disk 43 is mounted on three columns 3 attached to the lower shield 3. An insulating element 45 is mounted on the disk 43, which are located 120 ° each on the movable contact sections 46 of the three phases X, Y, Z.

The action of the voter and the elector in Figures 1 and 2 is as follows:

The double translation 13 is also actuated in a known manner by the Maltese wheels 12 and 15, the drive insulating shafts 6 and 7 and the associated tail rings 8 and 10 rotate the movable contact elements 9 and 11. Thus, the selection of the fixed contact members is successive. elements 4 and 5 deviations of the transformer control coil. Along with the even insulation shaft 7, the arm 29 is rotated at a certain angle. Upon reaching the middle position, the roll 30 enters the groove 31 and turns the Maltese sector 32. The tooth sector 34 is rotated through the second tooth sector 35 and the arm 25 by the actuating insulation rail 23. It actuates in a known manner the movable contact members 21 of a laterally arranged selector.

In the axially below the selector (Figures 3 and 4), the horn 30 rotates in the same way the Maltese sector 32. In this case, it rotates the arm 40 and the roller 41 acts on the groove 42 of the disc 43. The disc 43 rotates at a certain angle and through the insulation element 45 switches the moving contact sections 46 from the plus element 38 to the minus 39 or vice versa in the opposite direction of travel.

Claims

Claims (3)

1. A step-selector for a voltage regulator comprising a actuator comprising a roller arm and a Maltese sector connected to a movable contact system of the selector, characterized in that the arm (29) with the horn (30) is mounted to the lower end on the vertical even drive shaft (7) of the voter, and the Maltese sector (32) is attached to the lower shield (3) of the voter. 2. Step-selector for voltage regulator according to claim 1, characterized in that the Maltese sector (32), with the lateral selector selector, has a tooth sector (34) engaged with another tooth sector (35) connected to the insulating actuator rack (23) of the movable contact elements (21) of the selector. 5 Step-selector for step regulator according to claim 1, characterized in that the Maltese sector (32), with the axially positioned below the selector, has a shoulder (40) with a roller (41) located in a radial groove (42). Mounted to the lower shield (3) of the selector disc (43) connected to the movable contact sections (46) of the selector. Attachment: 4 figures