BG113215A - Power commutator contact system for a step voltage regulator with vacuum arc-suppression chambers - Google Patents

Abstract

The power commutator comprises three phases occupying 120 degree sectors and housed in a support structure of metal bottom (1), insulating cylinder (2) and insulating disk (3). Each phase has two main vacuum arc chambers (7, 8) and one auxiliary vacuum arc-supression chamber (9). On the outer surface of the insulating cylinder (2) are fixed contact elements (17, 19) two per phase, and in the middle is hinged a vertical drive shaft (4). There is provided main current-carrying loop composed of a contact element (19), a contact body (26), contact lamellas (24) of a known fast-acting disconnector, a current-carrying carrier (10), a main vacuum arc-supression chamber (7) with an outlet movable contact (11), a flexible connection (16), a bottom (1) and a current-carrying terminal (35). A parallel current-carrying loop is added and consists of a second contact body (28), contact lamellas (29) mounted on a three-legged support (32), a current-carrying disk (27) fixed to the upper ends of current-carrying columns (20) which are connected at their lower ends by a three-legged current-carrying star (33). This star is connected to the bottom (1) and the current-carrying terminal (35) by three additional current-carrying columns (34). The rated current of the power commutator can thus be doubled.

Description

Tony Dragomirov Grozdanov Yulia Oktavianova Hadjidimova Sofia (54) CONTACT SYSTEM OF POWER SWITCH FOR STEP VOLTAGE REGULATOR WITH VACUUM ARC EXTINGUISHING CHAMBERS

FIELD OF ENGINEERING

The invention relates to a step regulator with vacuum arc extinguishing chambers, which is built into power transformers with voltage regulation under load. Power switches of this type have main vacuum arc extinguishing chambers through which the operating current flows permanently. The rated current of the power switch is determined by the type of vacuum arc extinguishing chambers used. An increase in the rated current can be achieved by using parallel contact systems, the design of which depends on the design of the power switch.

PRIOR ART

A contact system of a power switch of a voltage step regulator (1) is known, containing three phases, each located in a sector of 120°. Each phase has two main vacuum arc extinguishing chambers and one auxiliary vacuum arc extinguishing chamber located between them. The three chambers are attached by live carriers to an insulating disc, which together with a metal bottom and an insulating cylinder form the load-bearing structure of the power switch. A vertical drive shaft is mounted in the middle of the power switch towards the bottom, which has command cams connected to mechanisms for opening and closing the vacuum arc extinguishing chambers. On the outside, on the periphery of the insulating cylinder, one odd current-carrying element is mounted for each phase, connected to the current-carrying carrier of one main vacuum arc extinguishing chamber through an odd quick-acting disconnector, and one even current-carrying element connected to the current-carrying carrier of the second main vacuum arc-extinguishing chamber through an even quick-acting disconnector . The quick-acting disconnectors are operated by a mechanism connected to the upper end of the control shaft. The current-carrying loop of each phase of the power switch is formed by a corresponding current-carrying odd or even contact element, a quick-acting disconnector, a current-carrying carrier, a vacuum arc extinguishing chamber, a flexible current-carrying connection, a metal bottom and a terminal contact element. A disadvantage of this power switch with vacuum arc extinguishing chambers is that its rated current is limited by the permissible overheating of the vacuum arc extinguishing chamber. At the same time, its switching capabilities are greater and are not used.

Another (2) power switch with vacuum arc extinguishing chambers is also known, containing one main and one auxiliary vacuum arc extinguishing chamber per phase. It also has a supporting structure of insulating cylinder and insulating rails, an insulating bottom supporting the vacuum arc extinguishing chambers, and an upper metal flange supporting a spring-energy accumulator connected to a system of cams driven by a central drive shaft. It also contains high-speed switching units and parallel contact systems. A disadvantage of this power switch is that it is very complex and has large overall dimensions. A disadvantage is that due to the presence of only one main vacuum arc extinguishing chamber, the switching resource of the power switch is less.

TECHNICAL ESSENCE OF THE INVENTION

The task of the invention is to create a contact system for a power switch with vacuum arc extinguishing chambers, which is simplified and with small overall dimensions. Through it, a significant increase in the nominal current of the power switch can be achieved.

The task was solved by a contact system for a power switch containing three phases - occupying sectors of 120° and located in a supporting structure of a metal bottom, an insulating cylinder and an insulating disc. Each phase has two main vacuum arc extinguishing chambers and one auxiliary vacuum arc extinguishing chamber. The current-carrying loop is composed of a fixed contact element attached to the insulating cylinder, contact lamellae of a disconnector, a current-carrying carrier, a main vacuum arc extinguishing chamber, a flexible connection, a bottom with a current-carrying terminal.

According to the invention, a parallel current-carrying circuit containing a contact body of a fixed contact element, contact lamellae with contact springs, a current-carrying disk, three vertical current-carrying columns, located at 120° and attached to an insulating disk, was made. A three-beam current-carrying star is mounted to the lower ends of the columns. Attached to the ends of the star's rays are three additional current-carrying columns placed at the bottom between the three phases. A conductive outlet is mounted to the bottom. The contact slats are located at the ends of a three-armed carrier attached to the upper end of a vertical drive shaft by means of an insulating element. The cross-section of the fixed contact elements has been increased. The current-carrying terminals become two or three.

An advantage of the contact system of the power switch for step voltage regulator, according to the invention, is that by means of a parallel current-carrying loop with a simplified construction and occupying a small space, an approximately two-fold increase in the nominal current of the power switch is achieved.

EXPLANATION OF THE ATTACHED FIGURES

An exemplary implementation of the contact system of the power switch with vacuum arc extinguishing chambers, according to the invention, is shown in the attached figures, of which:

Figure 1 is a longitudinal section (A-A) through the power switch containing a contact system.

Figure 2 - top view of the contact system, showing phase R in more detail.

Figure 3 - cross-section (B-B) above the three-beam current-carrying star.

Figure 4 - cross-section (C-C) above the central current-carrying disk of the contact system.

EXAMPLES OF IMPLEMENTATION OF THE INVENTION

The power switch containing the contact system has a supporting structure composed of a metal bottom 1, an insulating cylinder 2 and an insulating disc 3. A vertical drive shaft 4 with a buffer 5 and a fork 6 for connection to a known unshown spring-energy accumulator is mounted on the middle of the metal bottom 1. The three phases R, S, T occupy sectors of 120° each. Each phase has three vacuum arc extinguishing chambers - an odd main chamber 7, an even main chamber 8 and an auxiliary chamber 9 located between them. The chambers are mounted on the insulating disc by current-carrying carriers 10. The output movable contact 11 of each vacuum arc extinguishing chamber is opened and closed by a mechanism consisting of a cam element 12 with a roller 13, caught by a carrier 14 to the metal bottom 1. The roller 13 interacts functionally with a cam disk 15 mounted on the drive shaft 4. The electrical connection between the output contact 11 and the bottom 1 is made through a flexible connection 16. On the outer surface of the insulating cylinder 2, for each phase, an odd fixed contact element 17 and an even fixed contact element 18 are fixed. They can have extended ends 19 for ease of manufacture, but may be whole elements.

Three vertical current-carrying columns 20 spaced at 120° are mounted on the insulating disc 3. To these columns is attached a carrier 21 of a known gear mechanism 22, which actuates quick-acting disconnectors 23, providing isolation distances to the non-working deflection. The disconnectors 23 have contact lamellae 24, which make the electrical connection between the current-carrying console 25 attached to the carrier 10 and the contact body 26 formed on the elongated element 19.

At the upper end of the current-carrying columns 20, a current-carrying disk 27 is caught, which is electrically connected to a second contact body 28 through contact lamellae 29 with contact springs 30. At the upper end of the drive shaft 4, through an insulating element 31, a three-arm carrier 32 is mounted, which carries the contact lamellas 29. At the lower end of the current-carrying columns 20, a three-beam current-carrying star 33 is mounted connected to the bottom 1 through three additional columns 34 located between the three phases. A conductive terminal 35 is attached to the bottom 1.

The operation of the contact system is as follows: When switching, the spring-energy accumulator rotates the drive shaft 4 counterclockwise by 90° via the fork 6. The contact lamellae 29 are separated from the contact element 17 before the vacuum arc extinguishing chamber 7 is opened and are connected to 18 when the chamber 8 is closed. A parallel current-carrying loop through elements 19-28-2033.34.j_35 is obtained. The operation of the other mechanisms of the power switch is known.

Claims (3)

I. Contact system of power switch for step voltage regulator containing three phases occupying sectors of 120° and located in a supporting structure of metal bottom, insulating cylinder and insulating disk, each phase having two main vacuum arc extinguishing chambers and one auxiliary vacuum arc extinguishing chamber with a current-carrying loop composed of a fixed contact element attached to the insulating cylinder, contact lamellae of a disconnector, a current-carrying carrier, a main vacuum arc extinguishing chamber, a flexible connection, a bottom and a current-carrying terminal, characterized by having a parallel current-carrying loop containing a contact body (28 ) of a fixed contact element (19), contact lamellae (29) with contact springs (30), current-carrying disk (27), three vertical current-carrying columns (20) located at 120° and attached to an insulating disk (3), as to the lower ones ends of the columns (20) a three-beam current-carrying star (33) is mounted, to the ends of the beams of which three additional current-carrying columns (34) placed on the bottom (1) between the three phases (R, S, T), and on the bottom (1) a conductive terminal (35) is installed. 2. A power switch contact system for a step voltage regulator, according to claim 1, characterized in that the contact lamellae (29) are located at the ends of a three-arm carrier (32) fixed to the upper end of a vertical drive shaft (4) by insulating element (31). 3. Contact system of a power switch for a stepped voltage regulator, according to claims 1 and 2, characterized in that the cross-section of the fixed contact elements (17, 19) is increased and the current-carrying terminals (35) are two or three in number .