BG66736B1 - Contact system of a power commutator with vacuum arc-suppression chamber for a step voltage regulator - Google Patents

Abstract

The contact system is applied in a power switch with two main vacuum arc quenching chambers (VDK) and one auxiliary VDK per phase. The purpose is to alternately include the auxiliary VDK and a resistor connected in series with it in parallel with the operating main VDK. The three VDCs (7) have supports (8) through which they are attached to an insulating disk (5). Two fixed contacts (22) are connected to the main VDK, and the movable contact part is composed of contact lamellae (18) with contact springs (19) mounted on the horns (20) of a bearing (17) mounted on a drive shaft (9). A drive mechanism comprises a lever (14) mounted on an axle (13). The lever (14) has a tail (29) on its short side and a pin (15) on its long side, which enters the channel (16) of the carrier (17). A pin (11) mounted on a two-arm lever (10) connected to the shaft (9) acts on the tail (29) at the end of the switch. Thus, a small angular rotation of the shaft (9) is converted into a large angular rotation of the movable contact. Based on this principle, other variants implemented in different power switches have been proposed. The contact system with drive mechanism is simple and easy to set up. Unification of the spring-energy accumulators of power switches with VDK and those with arc quenching in oil is achieved.

Description

(54) CONTACT SYSTEM OF POWER SWITCH WITH VACUUM EXTINGUISHING CHAMBER FOR STEP VOLTAGE REGULATOR

Field of technology

The invention relates to a step regulator, which is built into a power transformer and regulates its voltage under load. The step controller has a power switch with two main and one auxiliary vacuum arc quenching chambers. The power switch also contains several specific contact systems.

BACKGROUND OF THE INVENTION

A contact system / 1 / of a power switch with three vacuum arc-quenching chambers (VDK) in phase, located inside an insulating cylinder and fixed by insulating disk brackets, is known. Two of the VDK are main and are located on both sides of one auxiliary VDK. The main VDCs have fixed contacts, which are alternately connected by a movable rotating contact with a fixed carrier. There is a current-limiting resistor connected between this fixed carrier and the carrier of the auxiliary VDK. The drive shaft is connected to a spring energy accumulator located below the VDK. The movable contact is located on top of a vertical insulating shaft, which on its lower side has a drive mechanism connected to the charger of a spring energy accumulator.

The disadvantage of this contact system is that the drive mechanism is complex and inconvenient to monitor and adjust. Another disadvantage is that the spring energy accumulator is complicated and is not unified with the one used in power switches with arc quenching in oil. This makes production difficult. Another disadvantage is that at the end of the operation of the motor drive large resistance moments appear, which loads it unnecessarily.

Technical essence of the invention

It is an object of the invention to provide a contact system for alternately switching on the auxiliary VDC and the resistor in parallel with one of the two main VDCs, the contact system and the drive mechanism being located above the supporting insulating disk. Actuate the drive from the drive shaft at the end of the shift. The spring energy accumulator should be unified for switches with VDK and switches with arc quenching in oil.

The problem is solved with a contact system connecting alternately auxiliary VDK and a resistor in parallel to one of the two main VDK. The contact system consists of two fixed contacts connected to the two main VDCs and a movable contact connected to a fixed carrier. The contact system is switched by a drive mechanism with an action synchronized with the switching of the three VDCs performed by a drive shaft. The three VDCs are attached by brackets to an insulating disk or sector located in an insulating cylinder.

According to the invention, the contact system and the drive mechanism are located above the insulating disk or sector. The drive mechanism consists of levers or levers and gears. It has an initial element in contact at the end of the switch with a pin located on the drive shaft. The gear ratio of the actuator is such that a small angular rotation of its initial element is converted into a large angular rotation of the movable contact. An embodiment of the invention can be made in several variants.

According to a first variant, the drive shaft has a two-pin two-arm lever. The drive mechanism has an initial element lever mounted on an axle mounted on the insulating disk. The lever is provided on its short side with a tail and on its long side - with a pin, which is located in an elongated channel on a carrier of the movable contact. The carrier is mounted on the drive shaft and has a contact arc connected by contact plates to a fixed carrier with a contact terminal for connecting a resistor.

According to a second variant, a drive hub is fixed to the drive shaft with a pin which enters an arcuate channel of a star mounted on the shaft. It has one beam with a single-phase power switch and three beams with a three-phase. The beam has at its end two horns located on either side of a roller connected by a plate bearing movable contact plates. The plate is mounted on an axle mounted on a support,

Descriptions of issued patents for inventions № 10.2 / 31.10.2018 attached to an insulating cylinder.

According to a third variant, the drive shaft is located under a resistor and has a gear wheel engaged with a gear sector which is connected to an insulating shaft. At the upper end of the shaft is mounted a spreading lever with two feathers, which are located on both sides of the pin. The pin is attached to the tail of a plate bearing movable contact plates. The plate is mounted on a support mounted on an insulating cylinder.

A variant is also possible in which the drive mechanism consists of a large gear with a tail mounted on the drive shaft, engaged with a small gear connected to a lever in contact with the movable contact. Thus, a small rotation of the large gear, effected by the action of a pin connected to the drive shaft on its tail, is converted into a larger rotation of the movable contact. The movement of the lever connected to the contact system can be reversed by using an additional parasitic gear.

An advantage of the contact system according to the invention is that it is simplified and is located together with the drive mechanism in a convenient place for adjustment and control. Another advantage is that the spring energy accumulator of the power switch is unified in the variant with VDK and in the variant with arc quenching in oil. This facilitates production and in-service revisions.

Explanation of the attached figures

Exemplary embodiments of the contact system according to the invention are shown in the attached figures, of which:

Figure 1 is a longitudinal section of the contact system according to a first embodiment;

Figure 2 is a cross-sectional view of the contact system of Figure 2; 1;

FIG. 3 is a plan view of the drive system according to FIG. 1; Figure 4 is a second cross-sectional view of the contact system of Figure 4; 1;

Figure 5 is a longitudinal section of the contact system according to a second variant; Figure 6 is a plan view and a partial section of the contact system of Figure 6; 5; Figure 7 is a cross-sectional view of the contact system of Figure 1; 5;

Figure 8 is a longitudinal section of the contact system according to a third variant; Fig. 9 is a plan view and a partial sectional view of the contact system of Figs. 8.

Examples of the invention

Figures 1, 2, 3 and 4 show an exemplary embodiment of the contact system according to a first embodiment. An odd main VDK 1 and an even main VDK 2, by means of supports 3 and 4, are attached to an insulating disk 5 located in an insulating cylinder 6. Auxiliary VDK 7 by means of a support 8 is mounted to disk 5 between VDK 1 and VDK 2. In the center of the insulating disk 5 is a bearing drive shaft 9 with a two-arm lever 10, and at the ends of the arms there are pins 11 and 12. Parallel to the shaft 9 on the insulating disk 5 is an axis 13 on which is mounted a drive lever 14. At the free end of the lever 14 has a pin 15 which enters an elongate channel 16 of a carrier 17 of the movable contacts mounted on the shaft 9. There are two angled movable contacts consisting of contact plates 18 and contact springs 19. The plates 18 are mounted on two horns 20 of the carrier 17. The movable contacts contact alternately with fixed contacts 21 and 22 connected to the carriers 3 and 4. The carrier 17 there is a contact arc 23 connected to a current-carrying contact consisting of contact plates 24 mounted on a plate 25 connected to a fixed carrier 26 with a contact terminal ΊΊ. The drive lever 14 is provided with an opening 28 allowing rocking relative to the shaft 9 and a tail 29, alternating with the pins 11 and 12. The operation of the contact system is as follows. The drive shaft 9 at each switch makes a certain abrupt rotation in one direction or another at an angle of 90 ° to 100 °. At the end of the rotation (for example in the last 10) the corresponding pin 11 or 12 strikes the tail 29, rotates the drive lever 14 and moves the carrier 17 through the pin 15. Thus the respective contact plates 18 rotate alternately with one of the fixed contacts 21 or 22. a current-limiting resistor connected between terminal ΊΊ and the carrier 8 is connected alternately in parallel to VDK 1 or VDK 2 (in the figures to VDK 2). It can be seen that through the lever mechanism a little angular rotation of the tail

Descriptions of issued patents for inventions № 10.2 / 31.10.2018 is converted into a large angular rotation of the movable contacts. A second variant of the contact system is illustrated in Figures 5, 6 and 7. The repeating elements of the previous figures are marked with the same numbers. A hub 30 is fixed to the shaft 9 with one pin 31 for a single-phase power switch or three pins located at 120 ° for a three-phase switch. On the shaft 9 is mounted a star 32 with one or three beams 33, depending on the type of power switch. The star 32 has a channel 34 that allows the pin 31 to contact the star 32 at the end of the switch. A support 35 is mounted on the insulating cylinder 6, on which a plate 37 bearing the movable contact plates 38 is mounted by an axis 36. An axis 39 is connected to the plate 37, on which a roller 40 or equivalently a rolling bearing is mounted. In order not to deform the switching oscillogram, the beam 33 is provided with an insulating element 41. The supports 3 and 4 have fixed contacts 42 and 43. The beam 33 has at its end two horns 44 and 45 which alternately contact the roller 40. On the shaft 9, a hub 46 is mounted, which is connected to contacts of VDK 1 and VDK 2, which have nothing to do with the contact system in question.

The operation of the contact system according to the second variant is as follows. In Figures 5, 6 and 7, the contact plates 38 are connected to the fixed contact 42, the operating current flowing through the VDK 1. To reverse switching, the shaft 9 with the hub 30 and the pin 31 rotate at an angle of approximately 90 °. Due to the presence of the channel 34, the pin 31 is in contact with the star 32 at the end of the switch - for example in the last 10 °. Thus, a small angular rotation is performed on the roller 3, in which the horn 45 acts on the roller 40 and the contact plates 38 are connected to the fixed contact 43. In parallel, in a certain way the operating current is transferred from VDK 1 to VDK 2.

A third variant (Fig. 8 and Fig. 9) is used when a resistor 47 is mounted above the drive shaft 9. In this case, the insulating disk 5 is shaped as a sector because the power switch is single-phase. There is also a second sector 48, on which the resistor 47 is mounted. The movable contact 49 of the VDK, the current-carrying element 50 and the connection 51 with a drive mechanism of a known type are also shown. To bypass the resistor 47, a gear 52 is mounted on the shaft 9, engaged with a gear sector 53. An insulating shaft 54, mounted 55 to the sectors 5 and 48, is connected to this sector. A buffer lever 56 is also mounted on the shaft 9. The plate 37 carrying the contact plates 38 has a tail 57 with a pin 58 or a roller. A spread lever 59 with two feathers 60 and 61 is attached to the upper end of the insulating shaft.

The operation of the contact system in the third option is as follows. In Figures 8 and 9, the tongue 60 has turned the plate 37 and the contact plates 38 are connected to the contact 42. A current conducts the VDC 1. When the gear 52 is rotated counterclockwise, the gear sector 53 will rotate the resistor lever 59 and the tongue 61 will reverse the movable contact system, while the current will be transferred to VDK 2. In this variant, there should be no other contact systems to VDK 1 and VDK 2.

Other combinations can be made according to the invention. For example, to mount a large tail gear on the drive shaft to engage with a small gear. This will achieve a combination of the first and third option. If a parasitic gear is added, a second option can be used.

Claims (5)

Patent claims 1. Power switch contact system with vacuum arc chambers for step voltage regulator, comprising two main and one auxiliary vacuum arc chambers with supports mounted on an insulating disk or sector, fixed contacts of the main vacuum arc chambers one of them connected alternately a movable contact which is connected to a drive mechanism having a drive shaft for hopping, and a fixed output contact for connecting a resistor is connected to the movable contact, characterized in that the contact system and the drive mechanism are located above the insulating disk or sector , the drive mechanism being composed of levers or levers and gears and having an initial element in contact with a pin located on the drive shaft (9). Contact system of a power switch according to claim 1, characterized in that the drive shaft (9) has a two-arm lever (10) with two pins (11, 12), the drive mechanism being Descriptions of issued patents for inventions № 10.2 / 31.10.2018 with initial element lever (14) mounted on an axis (13) mounted on an insulating disk (5), the lever (14) being provided on its short side with a tail ) and on its long side - with a pin (15), which is located in an elongated channel (16) of the carrier (17) of the movable contact (18), mounted on the drive shaft (9), and the carrier (17) has a contact arc (23) connected by contact plates (24) to a fixed carrier (26) with a contact terminal (27) for connecting a resistor. Contact system of a power switch according to claim 1, characterized in that a drive hub (30) is fixed on the drive shaft (9) with a pin (31) which enters an arcuate channel (34) of the bearing on the shaft (9). a star (32) whose beam (33) has at its end two horns (44,45) located on either side of a roller (40) connected to a plate (37) bearing movable contact plates (38), such as the plate 37) is mounted on an axle (36) mounted on a support (35) attached to an insulating cylinder (6). Contact system of a power switch according to claim 1, characterized in that the drive shaft (9) located under the resistor (47) has a gear (52) engaged with a gear sector (53) connected to a vertical insulating shaft ( 54), which has in its upper part a spread lever (59) with two feathers (60, 61) located on both sides of a pin (58), the pin (58) being attached to the tail (57) of the plate (37) bearing the movable contact plates (38), and the plate (37) is mounted on the shaft (36) mounted on the carrier (35) attached to the insulating cylinder (6). Power switch contact system according to claim 1, characterized in that the drive mechanism consists of a large tail gear mounted on the drive shaft, engaged with a small gear connected to a lever in contact with the movable contact.