CN-224232535-U - Electric emergency switch device

CN224232535UCN 224232535 UCN224232535 UCN 224232535UCN-224232535-U

Abstract

The utility model relates to an electrical emergency switching device comprising an electrically insulating housing (2), an interrupted current path (3) comprising a first electrically conductive terminal having a first contact surface and a second electrically conductive terminal having a second contact surface, a movable connecting element (5) comprising an insulating member (6) and an electrically conductive contact (7) which is movable along a central axis (8) from a starting position (9), in which the contact is electrically disconnected from the current path, to a closing position (10), in which the current path is closed by electrically connecting the contact and the first and second contact surfaces, a pyrotechnic actuator (11), a combustion chamber (12) formed at least partially by a recess (13) in the insulating member, the actuator being arranged to generate a pressurized gas in the combustion chamber in order to move the connecting element from the starting position to the closing position. The electrical emergency switching apparatus is capable of reliable operation in high voltage applications.

Inventors

N. Ignatov
G. Wallinger
P. Loveller
P. Altenhof

Assignees

米巴电阻器奥地利有限公司

Dates

Publication Date: 20260512
Application Date: 20250605
Priority Date: 20250519

Claims (10)

1. An electrical emergency switching apparatus, comprising: An electrically insulating housing (2); an interrupted current path (3) comprising a first conductive terminal (3-1) with a first contact surface (4-1) and comprising a second conductive terminal (3-2) with a second contact surface (4-2); A movable connecting element (5) comprising an insulating member (6) and at least one electrically conductive contact (7), said movable connecting element (5) being movable along a central axis (8) from a starting position (9) in which said at least one contact (7) is electrically disconnected from an interrupted current path (3) to a closing position (10) in which said current path (3) is closed by electrically connecting said at least one contact (7) with said first and second contact surfaces (4-1, 4-2), and A pyrotechnic actuator (11); The electrical emergency switching device is characterized in that it further comprises a combustion chamber (12) formed at least in part by a recess (13) in the insulating member (6), the pyrotechnic actuator (11) being provided for generating a pressurized gas in the combustion chamber (12) in order to move the movable connecting element (5) from the starting position (9) to the closed position (10).
2. Electrical emergency switching device according to claim 1, characterized in that the pyrotechnic actuator (11) has an opening face (15) from which pressurized gas is released and which faces the movable connecting element (5) and the combustion chamber (12), and that the electrically conductive sleeve (16) is arranged in contact with the pyrotechnic actuator (11) such that the electrically conductive sleeve (16), the pyrotechnic actuator (11) and the opening face (15) of the actuator are at a similar potential.
3. An electrical emergency switching apparatus according to claim 1 or 2, characterized in that an insulating layer (14) is provided between the first conductive terminal (3-1) and the second conductive terminal (3-2), the insulating layer (14) being either perforated by the movable connecting element (5) when the movable connecting element moves from the starting position (9) to the closed position (10) or the insulating layer (14) comprising an opening (14 a) for being penetrated by the movable connecting element (5) when the movable connecting element moves from the starting position (9) to the closed position (10).
4. Electrical emergency switching device according to claim 1 or 2, characterized in that the electrical emergency switching device (1) is adapted for high voltage operation in the range from 1kV to 20kV, wherein the maximum charge during a single partial discharge event does not exceed 10pC at the respective voltage level.
5. Electrical emergency switching device according to claim 2, characterized in that the insulating housing (2) further comprises a detachable inner housing element (17) which is attachable to the insulating housing (2) via a plug-in mounting and which contains mounting spaces for pyrotechnic actuators (11) and conductive sleeves (16) aligned with the central axis (8).
6. Electrical emergency switching device according to claim 5, characterized in that the inner housing element (17) has a circumferential groove and the pyrotechnic actuator (11), and the conductive sleeve (16) has a complementary circumferential projection for the plug-in mounting of the pyrotechnic actuator (11) and the conductive sleeve (16) into the inner housing element (17).
7. Electrical emergency switching device according to claim 1 or 2, characterized in that the recess (13) in the insulating member (6) has a surface facing the combustion chamber and that the surface has an electrically conductive coating.
8. Electrical emergency switching device according to claim 1 or 2, characterized in that the movable connecting element (5) is held in the starting position (9) via an insulating plate housing (18) which is provided in the housing (2) or is part of the housing (2) and surrounds the movable connecting element (5).
9. Electrical emergency switching device according to claim 8, characterized in that the movable connecting element (5) and the insulating plate housing (18) have complementary circumferential grooves in which an O-ring seal (19) is arranged, and in that the movable connecting element (5) is held in the starting position (9) via the O-ring seal (19).
10. An electrical emergency switching apparatus according to claim 9, characterized in that the insulating plate housing (18) has a first end face (21) facing the first and second conductive terminals (3-1, 3-2) and a second end face (22) facing away from the first and second conductive terminals (3-1, 3-2), and that the complementary circumferential grooves of the insulating plate housing (18) and the movable connecting element (5) and the O-ring seal (19) are located closer to the second end face (22) of the insulating plate housing than to the first end face (21).

Description

Electric emergency switch device Technical Field The present application relates to an electrical emergency switching apparatus. Background Pyrotechnic switching devices are generally known in the art and are often used to quickly disconnect an electrical connection or to quickly create a short circuit in order to bypass a failed power component. For example, WO2024103096A1 discloses an electrical switching apparatus for the rapid simultaneous electrical closure of at least three conductors designed for high currents and high voltages. In addition, EP3924991B1 discloses an electrically closed switch comprising movable contacts with a reduced tendency, housed in insulating material and actuated by a pyrotechnic mechanism, allowing a quick and safe engagement between the electrodes with flexible appendages. To prevent material damage over life in high voltage environments, the components require minimization of the risk of partial discharge that might otherwise lead to electrical failure or negative changes in material properties. Thus, for insulation separating high voltage components from other important components, such as pyrotechnic actuators, it is important that partial discharges be substantially excluded, or that partial discharges should occur such that they do not compromise insulation (partial discharges are generally considered to be less than 10 pC). In the present case, this is achieved by means of additional external electronic circuits or long insulation distances, both of which are disadvantageous, since external electronic circuits require additional materials and manufacturing costs, and long insulation distances increase the required installation space for the switching device. Disclosure of utility model The object of the present application is therefore to provide an electrical emergency switching device for reliable operation in high-voltage applications. Another object of the application is to provide an electrical emergency switching device having a compact design. Yet another object of the present application is to provide an electrical emergency switching apparatus that is easy to assemble, having a simple and/or inexpensive design. The object is solved by an electrical emergency switching apparatus comprising: an electrically insulating housing; An interrupted current path, the current path comprising a first conductive terminal having a first contact surface and the current path comprising a second conductive terminal having a second contact surface; A movable connecting element comprising an insulating member and at least one electrically conductive contact part, the movable connecting element being movable along a central axis from a starting position in which the at least one contact part is electrically disconnected from an interrupted current path, to a closing position in which the current path is closed by electrically connecting the at least one contact part and the first and second contact surfaces, and A pyrotechnic actuator; The electrical emergency switching apparatus is characterized in that it further comprises a combustion chamber, which is formed at least in part by a recess in the insulating member, the pyrotechnic actuator being provided for generating a pressurized gas in the combustion chamber in order to move the movable connecting element from the starting position to the closed position. According to one embodiment of the application, the electrical emergency switching apparatus comprises an electrically insulating housing, a pyrotechnic actuator and an interrupted current path. The interrupted current path includes a first conductive terminal having a first contact surface. In addition, the interrupted current path includes a second conductive terminal having a second contact surface. In addition, a movable connecting element is provided, which comprises an insulating member and at least one electrically conductive contact, said movable connecting element being movable along a central axis from a starting position to a closed position. In the starting position, the at least one contact is electrically disconnected from the interrupted current path, and in the closed position the current path is closed by electrically connecting the at least one contact with the first and second contact surfaces. Furthermore, a combustion chamber is included, which is at least partially formed by a recess in the insulating member, said pyrotechnic actuator being provided for generating a pressurized gas in the combustion chamber in order to move the movable connecting element from the starting position to the closed position. During ignition of a pyrotechnic actuator, conductive particles, such as soot, are typically released along with the pressurized gas generated. If such particles are not confined, the risk of partial discharge increases considerably, thus adversely affecting the lifetime of the electrical emergency switching apparatus. In the present utility model, the