WO2009093919A2

WO2009093919A2 - Mean voltage disconnector to be applied especially in mining electrical equipment

Info

Publication number: WO2009093919A2
Application number: PCT/PL2009/050001
Authority: WO
Inventors: Edward Januszkiewicz
Original assignee: Edward Januszkiewicz
Priority date: 2008-01-25
Filing date: 2009-01-26
Publication date: 2009-07-30
Also published as: PL211951B1; PL384325A1; WO2009093919A3

Abstract

The subject-matter of the invention is construction of the mean voltage disconnector to be applied especially in mining electrical equipment. The mean voltage disconnector provided with the known contacts in the vacuum chambers, constructed in such a way that in each of three current paths of the disconnector, the immovable contact (1) and the movable contact (2) of the vacuum chamber (3) are connected in parallel with the immovable contact (4) and the movable contact (5) of the main current path of the disconnector. This connection is performed in such a way, that the immovable contact (1) of the vacuum chamber (3) is connected permanently and immovably with the immovable contact (4) of the disconnector, whereas themovable contact (5) provided with the cam (6) onits end is mounted rotationally on the end of the permanent joint (7), into which the rocker (9) having a shape of triangle is mounted also rotationally on the axis (8), and this triangle at one of its vertex (10) is connected by means of an articulated joint to the outer end of the movable contact (2) of the vacuum chamber (3), whereas at the second vertex of the rocker (9), close to the cam (6), the roll (11) tightened with the flat spring (12) is situated.

Description

Mean voltage disconnector to be applied especially in mining electrical equipment

The subject-matter of the invention is the mean voltage disconnector provided with the known vacuum chambers and the known movable contacts, intended for exploitation under severe conditions in mining industry. Exploitation of electrical equipment requires disconnection of electric circuits with the purpose to carry out their repair and/or maintenance. The process of high-power current disconnection is associated with generation of an electric arc, which burns contacts partially or causes their complete damage. The known construction solutions of mean voltage disconnectors consist in disconnection of contacts closed in vacuum chambers or in spaces filled with sulphur hexafluoride SF6. The contacts are pressed down with atmospheric pressure and a spring; and most frequently they are opened out with electromagnets. Also known are disconnectors provided with contacts placed in air, but then the main contacts are additionally provided with parallel burnt contacts with exhaust system used for extinguishing of the electric arc.

In the case of disconnectors with vacuum chambers, the fact that contacts are not visible makes it impossible to estimate their position directly. The provisions of standards in force with respect to this branch of industry state that the gap should be visible. This results in the necessity to use additional apparatuses e.g. disconnecting switches provided with visible contacts. In the case of disconnectors provided with vacuum chambers, their susceptibility to shocks and vibrations is also very essential as the above may cause temporary break of circuit.

In the case of disconnectors provided with burnt contacts, we usually deal with equipment having large overall dimensions which, at the same time, may be associated with relatively low currents. Moreover, what is especially essential for mining industry where methane hazards occur, disconnectors provided with the burnt contacts produce open fire in electric arc. The purpose of the invention is construction of the mean voltage disconnector with a compact structure, capable to disconnect high currents with simultaneously visible contacts, high resistance to shocks and vibrations, ensuring the possibility of manual or mechanical control. The essence of the parallel, mean voltage disconnector provided with the known movable contacts and the known vacuum chambers according to the invention is that in at least one, preferably - in three current paths of the disconnector, immovable and movable contacts of the vacuum chamber are connected in parallel with the permanent and movable contact of the disconnector. This connection is performed in such a way, that at least one immovable contact of the vacuum chamber is connected permanently and immovably with at least one contact of the disconnector, whereas at least one movable contact provided with a cam on its end is mounted rotationally on the end of the permanent joint, into which the rocker having a shape of triangle is mounted also rotationally on the axis, and this triangle at one of its vertex is connected by means of an articulated joint to the outer end of the movable contact of the vacuum chamber, whereas at the second vertex of the rocker, close to the cam, a roll tightened with a flat spring is situated. Preferably, the rocker is composed of two triangular plates made of silver-plated copper, pressed down to the articulated joint by means of the spring having a form of cut-off ring.

Also preferably, the immovable contact of the vacuum chamber along with immovable contacts of the main current path of the disconnector are placed in a permanent way between two parallel dielectric plates, which in their lower part are joined together by means of the perpendicular wall and the arched bottom, preferably made of poured epoxide resins with dielectric properties.

The subject-matter of the invention has been presented in the figures, where Fig. l presents a kinematic diagram of the disconnector contacts in the state of parallel current conduction, whereas Fig.2 presents a kinematic diagram of the contacts in the state of the main contacts disconnection at the moment of current conduction only through the vacuum chambers; Fig. 3 presents a kinematic diagram in the state of the main contacts disconnection and the vacuum chambers contacts disconnection. Fig. 4 presents an axonometric view of the parallel contacts of the disconnector, whereas Fig 5. presents an axonometric view of the current path with the dielectric plates and the bottom after removal of one plate. The disconnector provided with parallel contacts is constructed in such a way, that in each current path of the disconnector, the immovable contact 1 and the movable contact 2 of the vacuum chamber 3 are connected in parallel with the immovable contact 4 and movable contact 5 of the disconnector. This connection is performed in such a way, that the immovable contact 1 of the vacuum chamber 3 is connected permanently and immovably with the immovable contact 4 of the main current path of the disconnector, whereas the movable contact 5 provided with the cam 6 on its end is mounted rotationally on the end of the permanent joint 7 , into which the rocker 9 having a shape of triangle is mounted also rotationally on the axis 8, and this triangle at one of its vertex 10 is connected by means of an articulated joint to the outer end of the mechanical contact 2 of the vacuum chamber 3, whereas at the second vertex of the rocker 9, close to the cam 6, the roll 11 tightened with the flat spring 12 is situated.

Moreover, the rocker 2 is composed of two triangular plates 13 made of silver-plated copper, pressed down to the articulated joint by means of the spring having a form of cut-off ring 14. Moreover, the immovable contacts 1 of the vacuum chamber 3 along with immovable contacts 4 are placed in a permanent way between two parallel dielectric plates 15, which in their lower part are joined together by means of the perpendicular wall 16 and the arched bottom, preferably made of poured epoxide resins with dielectric properties.

The mean voltage disconnector according to the invention forms a compact, monolithic, simple structure with a small number of elements, concise in a form. The disconnector according to the invention enables two-stage disconnection of contacts, first - the main large - mass operating contacts, and next - disconnection of contacts in the vacuum chamber, which break a galvanic connection. Disconnection of the contacts in the vacuum chamber is coupled explicitly and securely with disconnection of the main contacts of the disconnector. Disconnection of very high currents is being performed without open fire what is of great importance under mining industry conditions.

Claims

PATENT CLAIMS

1. The mean voltage disconnector provided with the known contacts in the vacuum chambers, characterized in that in at least one current path of the disconnector, the immovable contact (1) and the movable contact (2) of the vacuum chamber (3) are connected in parallel with the immovable contact (4) and the movable contact (5) of the disconnector. This connection is performed in such a way, that the immovable contact (1) of the vacuum chamber (3) is connected permanently and immovably with at least one immovable contact (4) of the main current path of the disconnector, whereas the movable contact (5) provided with the cam (6) on its end is mounted rotationally on the end of the permanent joint (7), into which the rocker (9) having a shape of triangle is mounted also rotationally on the axis (8), and this triangle at one of its vertex (10) is connected by means of an articulated joint to the outer end of the movable contact (2) of the vacuum chamber (3), whereas at the second vertex of the rocker (9), close to the cam (6), the roll (11) tightened with the flat spring (12) is situated.

2. The mean voltage disconnector according to the claim (1), characterized in that the rocker (9) is composed of two parallel triangular plates (13), pressed down to the permanent joint (7) by means of the spring (14) having a form of cut-off ring (14), and preferably triangular plates (13) and the permanent joint (7) are made of silver-plated copper.

3. The mean voltage disconnector according to the claim (1), characterized in that the immovable contacts (1) of the vacuum chamber (3) along with the immovable contacts (4) are placed in a permanent way between two parallel dielectric plates (15), which in their lower part are joined together by means of the perpendicular wall (16) and the arched bottom (17), preferably made of poured epoxide resins with dielectric properties.