EP3413329A1

EP3413329A1 - Wiring-improved structure for rotary double-breakpoint switch contact system

Info

Publication number: EP3413329A1
Application number: EP17746777.6A
Authority: EP
Inventors: Rui Tang
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2016-02-05
Filing date: 2017-01-18
Publication date: 2018-12-12
Also published as: KR102053070B1; KR20180108701A; EP3413329A4; WO2017133457A1; JP2019505085A; CN107045959A

Abstract

An improved wiring structure of a contact system of a rotary double-break switch includes: a moving contact (1), a fixed contact (2), and a short-circuit busbar (3). Electrical connection between the moving contact (1) and the fixed contact (2) can be achieved during rotation, the fixed contact (2) is connected to the short-circuit busbar (3) by using a terminal screw (4), and the terminal screw (4) can enable wire entry along a circumferential direction. The present invention improves a wiring manner, so that a wiring direction of the contact system of the rotary double-break disconnector can be flexibly changed, thereby satisfying a requirement on field mounting of the disconnector.

Description

BACKGROUND

Technical Field

The present invention relates to the field of disconnector technologies, and specifically, to an improved wiring structure of a contact system of a rotary double-break switch.

Related Art

A disconnector is the most-used electric appliance in high-voltage switch electric appliances. A main feature of the disconnector is that the disconnector has no arc extinguishing capacity and can close or open a circuit only when there is no load current. The disconnector is used for all classes of voltages, and is used for changing a circuit connection or isolating a line or device from a power supply. The disconnector has no breaking capacity and only can perform an operation after the line is closed by using another device. The disconnector is usually provided with an interlock apparatus used for preventing a misoperation when a switch carries a load. Sometimes, a pin is required to prevent the switch from being turned off under a magnetic effect of a big fault. In a circuit system, when a circuit is faulty or corrective maintenance needs to be performed on a circuit, a circuit breaker trips. In this case, the disconnector plays a role of cutting off a low current or providing an obvious fracture, so as to ensure safety of a worker during repairing or corrective maintenance. Generally, there are two types of disconnectors: an unenclosed disconnector and a gas-insulated metal-enclosed disconnector. The unenclosed disconnector is directly exposed to the air, and an obvious fracture may be viewed when the disconnector is switched off, but the unenclosed disconnector is large in size and is relatively heavy. The gas-insulated metal-enclosed disconnector is small in size and high in reliability, thereby is widely used. The gas-insulated metal-enclosed disconnector usually includes three disconnector single-phases, and each disconnector single-phase includes a cylinder body. A moving contact, a fixed contact, and a driving mechanism that drives the moving contact to move are disposed in the cylinder body. Electrical driving is used for most driving mechanisms. However, the gas-insulated metal-enclosed disconnector is enclosed, and therefore, a worker cannot directly observe and clearly sense whether the gas-insulated metal-enclosed disconnector is in a breaking state.
Currently, there is a common rotary double-break disconnector on the market. Wiring of a contact system of the rotary double-break disconnector can only be implemented in a one-direction wire-entry manner. Consequently, an application range of the rotary double-break disconnector is narrowed. In some special scenarios where a mounting position of the disconnector needs to be changed, a wiring direction cannot be adjusted, causing inapplicability of the disconnector.

SUMMARY

An objective of the present invention is to provide an improved wiring structure of a contact system of a rotary double-break switch to resolve the technical defect that a wiring direction of an existing rotary double-break disconnector is single. A wiring manner is improved, so that a wiring direction of the contact system of the rotary double-break disconnector can be flexibly changed, thereby satisfying a requirement on field mounting of the disconnector.

Technical solution

To achieve the foregoing technical objective, the improved wiring structure of the contact system of the rotary double-break switch designed in the present invention includes a moving contact, a fixed contact, and a short-circuit busbar, where electrical connection between the moving contact and the fixed contact can be achieved during rotation, and the fixed contact is connected to the short-circuit busbar by using a terminal screw, so that the terminal screw can enable wire entry along a circumferential direction.
Further, a mounting axis direction of the terminal screw is perpendicular to a principal axis of the moving contact.
Further, the short-circuit busbar is of a shape of "
", two ends of the short-circuit busbar are provided with terminal screw mounting vias, the short-circuit busbar is locked to a tail end of the fixed contact by using the terminal screw, a head end of the fixed contact extends into a slot of the moving contact, and during rotation of the moving contact, a contact end can come into contact with the head end of the fixed contact to form electrical connection.
Further, the tail end of the fixed contact is provided with a thread hole, and the head end of the fixed contact is connected to the tail end by using a connecting portion.
Further, the head end of the fixed contact and the tail end are planar structures perpendicular to each other.
Further, during rotation, the moving contact can come into contact with the head end of the fixed contact to implement double-break.
Further, the moving contact is mounted onto a coupling.
Further, the moving contact, the fixed contact, and the short-circuit busbar are mounted onto a base.
Further, a bottom surface of a wiring port at which the terminal screw is connected to the fixed contact tilts downward, so that a wiring angle of a connection wire inserted between the terminal screw and the fixed contact is increased.

Beneficial effects

The present invention provides an improved wiring structure of a contact system of a rotary double-break switch. A wiring manner is changed, that is, the fixed contact is connected to the short-circuit busbar by using the terminal screw, so that the terminal screw can enable wire entry along a circumferential direction. In this way, the wiring direction of the contact system of the rotary double-break disconnector can be flexibly changed, thereby satisfying a requirement on field mounting of the disconnector.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic exploded view of an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of mounting a short-circuit busbar according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a short-circuit busbar according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a moving contact according to an embodiment of the present invention; and
FIG. 6 is a schematic structural diagram of a fixed contact according to an embodiment of the present invention.

DETAILED DESCRIPTION

The following further describes the present invention with reference to the accompanying drawings and embodiments.

Embodiment

As shown in FIG. 1 and FIG. 2, an improved wiring structure of a contact system of a rotary double-break switch provided in the present invention includes: a moving contact 1, a fixed contact 2, and a short-circuit busbar 3. Electrical connection between the moving contact 1 and the fixed contact 2 can be achieved during rotation, the fixed contact 2 is connected to the short-circuit busbar 3 by using a terminal screw 4, and the terminal screw 4 can enable wire entry along a circumferential direction. In this embodiment, a wire enters from an outer side (the right side).
Still, referring to FIG. 1, a mounting axis direction of the terminal screw 4 is perpendicular to a principal axis of the moving contact 1. The moving contact 1, the fixed contact 2, and the short-circuit busbar 3 are mounted onto a base 6.
As shown in FIG. 3 and FIG. 4, the short-circuit busbar 3 is of a shape of "
", two ends of the short-circuit busbar 3 are respectively a planar structure and parallel to each other, and the two ends are connected by using a rod or a plate structure therebetween. Each end is provided with a terminal screw mounting via 301. One end is locked to a tail end 203 of the fixed contact 2 by using the terminal screw 4 and can be used for external wiring (refer to FIG. 2 and FIG. 6). The other end 305 extends into a connection slot 8 of the base 6 and can be conveniently in communication with (in electrical connection to) another rotary double-break switch that is used in combination when required. A head end 202 of the fixed contact 2 extends into a slot 101 of the moving contact 1, and a surface of the slot 101 is perpendicular to the principal axis of the moving contact 1. In this way, during rotation of the moving contact 1, a contact end 102 can come into contact with the head end 202 of the fixed contact 2 to form electrical connection. In this embodiment, the mounting via 301 is a gap, thereby facilitating connection. Certainly, an enclosed hole may alternatively be used.
Still referring to FIG. 1, a bottom surface 91 of a wiring port 9 at which the terminal screw 4 is connected to the fixed contact 2 tilts downward (towards a bottom surface of the base), so that different wiring angles between 0° and 45° of a connection wire inserted between the terminal screw 4 and the fixed contact 2 can be achieved, thereby increasing the wiring angle and facilitating wiring. A high bottom surface of an existing switch is almost parallel to a surface of the base 6, and only one-direction wiring can be performed.
As shown in FIG. 6, the tail end of the fixed contact 2 is provided with a thread hole 201, and the head end 202 of the fixed contact 2 is connected to the tail end 203 by using a connecting portion 204. In this embodiment, the planar head end 202 of the fixed contact 2 is perpendicular to a plane of the tail end 203 through a transition of the connecting portion 204, so that the terminal screw 4 can enable wire entry along a circumferential direction.
Further, referring to FIG. 5, during rotation, the moving contact 1 can come into contact with head ends 202 of two fixed contacts 2 to implement double-break (please explain the meaning of "double-break", and no explanation is required if "double-break" is a standard noun in the industry).
The moving contact 1 is mounted onto a coupling 5.
According to the improved wiring structure of the contact system of the rotary double-break switch provided in the present invention, a wiring manner is improved, and the fixed contact 2 is connected to the short-circuit busbar 3 by using the terminal screw 4, so that the terminal screw 4 can enable wire entry along the circumferential direction. In this way, the wiring direction of the contact system of the rotary double-break disconnector can be flexibly changed, thereby satisfying a requirement on field mounting of the disconnector of the present invention at various positions.
The structures, scales, and sizes illustrated in the accompanying drawings of the embodiments are merely used for understanding and reading by a person skilled in the art in combination with the content disclosed in the specification, and are not intended to limit constraint conditions to which the present can be applied, and therefore have no technically essential meaning. Any modification to the structures, any change of scaling relations, or any adjustment of the sizes without affecting the effects generated and objectives achieved by the present invention should fall within the scope of the technical content disclosed in the present invention. In addition, terms used in the specification such as "above", "below", "left", "right", "middle", "clockwise", and "counterclockwise" are also used for clear description, and are not intended to limit the implementation scope of the present invention. A change or adjustment of relative relations without essentially changing the technical content should also be considered as falling within the scope of the present invention.

Claims

An improved wiring structure of a contact system of a rotary double-break switch, comprising: a moving contact (1), a fixed contact (2), and a short-circuit busbar (3), wherein electrical connection between the moving contact (1) and the fixed contact (2) can be achieved during rotation, the fixed contact (2) is connected to the short-circuit busbar (3) by using a terminal screw (4), and the terminal screw (4) can enable wire entry along a circumferential direction.
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein a mounting axis direction of the terminal screw (4) is perpendicular to a principal axis of the moving contact (1).
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein the short-circuit busbar (3) is of a shape of "
", two ends of the short-circuit busbar (3) are provided with terminal screw mounting vias (301), the short-circuit busbar (3) is locked to a tail end of the fixed contact (2) by using the terminal screw (4), a head end (202) of the fixed contact (2) extends into a slot (101) of the moving contact (1), and during rotation of the moving contact (1), a contact end (102) can come into contact with the head end (202) of the fixed contact (2) to form electrical connection.
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein the tail end (203) of the fixed contact (2) is provided with a thread hole (201), and the head end (202) of the fixed contact (2) is connected to the tail end (203) by using a connecting portion (204).
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein the head end (202) of the fixed contact (2) and the tail end (203) are planar structures perpendicular to each other.
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein during rotation, the moving contact (1) can come into contact with head ends (202) of two fixed contacts (2) to implement double-break.
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein the moving contact (1) is mounted onto a coupling (5).
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein the moving contact (1), the fixed contact (2), and the short-circuit busbar (3) are mounted onto a base (6).
The improved wiring structure of the contact system of the rotary double-break switch according to claim 1, wherein a bottom surface (91) of a wiring port (9) at which the terminal screw (4) is connected to the fixed contact (2) tilts downward, so that a wiring angle of a connection wire inserted between the terminal screw (4) and the fixed contact (2) is increased.