Integrated environment-friendly gas-insulated three-position isolating switch

Abstract

An embodiment of the invention discloses an integrated environment-friendly gas-insulated three-position isolating switch, which comprises a mechanism mounting plate, an operating mechanism, a contact mechanism and an insulating support arranged on the inner side of the mechanism mounting plate, and is characterized in that the contact mechanism comprises a grounding static contact, a middle static contact, a high-voltage static contact, a moving contact, an insulating screw rod and a magnetofluid dynamic sealing device; the grounding static contact, the middle static contact and the high-voltage static contact are sequentially arranged on the insulating bracket, the moving contact is correspondingly arranged in the middle static contact, and the magnetofluid dynamic sealing device is arranged on the mechanism mounting plate; one end of the insulating screw rod is connected with a rotating shaft of the magnetofluid dynamic sealing device, and the other end is correspondingly in threaded connection with the moving contact; and the operating mechanism is arranged on the outer side of the mechanism mounting plate. According to the invention, an integrated preassembly design concept is adopted, and the whole GIS is installed in the compartment after being installed and debugged, which is different from the traditional GIS which is assembled and debugged in a narrow compartment, so that the whole production efficiency is effectively improved, and the labor cost is saved.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to an integrated environmentally friendly gas-insulated three-position disconnector. Background Art

[0002] According to data released by the Global Wind Energy Council (GWEC), the development of offshore wind power resources in my country has come to an end, and offshore wind power construction is moving towards the sea. Subject to the limitations of AC submarine cable charging current and charging power, industrial frequency AC power transmission is generally only suitable for offshore wind farms with small capacity.

[0003] The large-capacity offshore wind power transmission scheme for offshore wind power over long distances adopts 20Hz low-frequency transmission technology. By reducing the frequency and increasing the current carrying capacity of the cable, the effective load capacity of the cable is increased, and the power transmission distance is greatly extended; there is no need to build an offshore converter station, which greatly reduces the construction and maintenance costs of the transmission system, and is a new direction for the development of offshore wind power transmission technology in the future.

[0004] In current technology, the only switchgear used in low-frequency systems is the traditional SF6 GIS switchgear, whose SF6 gas will not decompose naturally in the atmosphere. Therefore, it is urgent to develop a 72.5kV integrated environmentally friendly gas-insulated three-position disconnector for low-frequency system applications, which can be assembled and debugged as a whole and installed in the compartment as a whole, effectively improving production efficiency, and is suitable for mass production, reducing labor costs, and has certain economic benefits. Summary of the invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide an integrated environmentally friendly gas-insulated three-position disconnector so that it can be installed in a compartment as a whole.

[0006] In order to solve the above technical problems, an embodiment of the present invention proposes an integrated environmentally friendly gas-insulated three-position disconnector, including a mechanism mounting plate, an operating mechanism, a contact mechanism and an insulating bracket arranged on the inner side of the mechanism mounting plate, the contact mechanism including a grounding static contact, an intermediate static contact, a high-voltage static contact, a moving contact, an insulating screw rod, and a magnetohydrodynamic sealing device. The grounding static contact, the intermediate static contact, and the high-voltage static contact are sequentially arranged on the insulating bracket, the moving contact is correspondingly installed in the intermediate static contact, and the magnetohydrodynamic sealing device is arranged on the mechanism mounting plate; one end of the insulating screw rod is connected to the rotating shaft of the magnetohydrodynamic sealing device, and the other end is correspondingly threaded with the moving contact; the operating mechanism is arranged on the outer side of the mechanism mounting plate, and is used to drive the rotating shaft of the magnetohydrodynamic sealing device to rotate, thereby driving the moving contact to move.

[0007] Furthermore, an inlet and outlet bushing is provided on the mechanism mounting plate, and a sealing ring is provided between the inlet and outlet bushing and the mechanism mounting plate.

[0008] Furthermore, the inner end of the inlet and outlet bushings is electrically connected to the middle static contact through a connecting conductor.

[0009] Furthermore, two ends of the middle stationary contact are correspondingly provided with a current-carrying spring contact finger A and a guide ring A for guiding the linear motion of the moving contact.

[0010] Furthermore, the high-voltage static contact is provided with a flow-through spring contact finger B, a guide column assembly and a guide ring B accordingly.

[0011] Furthermore, a current-carrying spring contact finger C and a guide ring C are correspondingly provided in the grounding static contact.

[0012] Furthermore, metal shielding covers are provided on the high-voltage static contact, on the grounding static contact and on both ends of the middle static contact.

[0013] Furthermore, there are multiple groups of contact mechanisms.

[0014] Furthermore, the operating mechanism includes a rotating handle and a transmission pair, and the rotating handle drives the rotating shaft of the magnetohydrodynamic sealing device to rotate counterclockwise or clockwise through the transmission pair.

[0015] Furthermore, the moving contact is tubular.

[0016] The beneficial effects of the present invention are as follows: the present invention realizes large break distance and slow action closing, meets the opening and closing test of small capacitive and small inductive current, and the insulation level is stable after multiple opening and closing tests. The present invention adopts an integrated pre-assembly design concept, and is installed and debugged as a whole and then installed in the compartment. Different from the traditional GIS that is assembled and debugged in a small compartment, it effectively improves the overall production efficiency and saves labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of an integrated environmentally friendly gas-insulated three-position disconnector according to an embodiment of the present invention.

[0018] Figure 2 It is a front view of an integrated environmentally friendly gas-insulated three-position disconnector according to an embodiment of the present invention.

[0019] Figure 3 1 is a top view of an integrated environmentally friendly gas-insulated three-position disconnector according to an embodiment of the present invention.

[0020] Figure 4 It is a side view of an integrated environmentally friendly gas-insulated three-position disconnector according to an embodiment of the present invention.

[0021] Figure 5 It is a front view of a partial structure of an integrated environmentally friendly gas-insulated three-position disconnector according to an embodiment of the present invention.

[0022] Figure 6 yes Figure 5 Cross-sectional view at AA in the middle.

[0023] Figure 7 It is a three-dimensional structural diagram of a contact mechanism according to an embodiment of the present invention.

[0024] Figure 8 It is a three-dimensional structural diagram of a high-voltage static contact according to an embodiment of the present invention.

[0025] Description of Figure Numbers Grounding static contact 10, current-carrying spring contact finger C11, guide ring C12, metal shielding cover 13, intermediate static contact 20, current-carrying spring contact finger A21, guide ring A22, connecting conductor 23, high-voltage static contact 30, current-carrying spring contact finger B31, guide ring B32, guide column assembly 33, moving contact 40, insulating screw rod 41, magnetohydrodynamic sealing device 42, mechanism mounting plate 50, insulating bracket 51, grounding mounting plate 52, inlet and outlet line bushings 53, sealing ring 54, operating mechanism 60, rotating handle 61, transmission pair 62. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention is further described in detail below in conjunction with the drawings and specific embodiments.

[0027] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, back, etc.), they are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0029] Please refer to Figures 1 to 8 The integrated environmentally friendly gas-insulated three-position disconnector of the embodiment of the present invention includes a mechanism mounting plate, an operating mechanism, a contact mechanism and an insulating bracket.

[0030] The insulating bracket is arranged on the inner side of the mechanism mounting plate, and the operating mechanism is arranged on the outer side of the mechanism mounting plate. The mechanism mounting plate is preferably made of aluminum. The insulating bracket is composed of a plurality of support columns and a support plate.

[0031] The contact mechanism includes a grounding static contact, an intermediate static contact, a high-voltage static contact, a moving contact, an insulating screw, and a magnetohydrodynamic sealing device. The magnetohydrodynamic sealing device is arranged on the mechanism mounting plate. The magnetohydrodynamic sealing device is an existing structure, similar to a "liquid O-ring", and its function is to transfer the rotational motion from the outside of the mechanism mounting plate to the insulating screw inside the mechanism mounting plate.

[0032] The grounding static contact, the middle static contact, and the high-voltage static contact are arranged on the insulating bracket in sequence. The moving contact is installed in the middle static contact accordingly. One end of the insulating screw is connected to the rotating shaft of the magnetohydrodynamic sealing device, and the other end is correspondingly threadedly connected to the moving contact. Preferably, a grounding mounting plate is provided on the inner side of the mechanism mounting plate, and the grounding static contact is connected to the grounding mounting plate, and the grounding copper bus is led out and installed in the aluminum mechanism mounting plate to achieve connection with the ground. In specific implementation, the grounding static contact and the bus are installed in the grounding mounting plate, and the grounding copper plate is led out at the bus and connected to the mechanism mounting plate. Through the reverse rotation of the operating mechanism, the moving contact is pulled and inserted into the grounding static contact, thereby realizing grounding on the outgoing line side or the incoming line side.

[0033] The operating mechanism is used to drive the rotating shaft of the magnetic fluid pneumatic sealing device to rotate, and then drive the moving contact to move. That is, the insulating screw is installed at the end of the rotating shaft of the magnetic fluid pneumatic sealing device, and the insulating screw is provided with an external thread, and the moving contact is correspondingly provided with an internal thread. The insulating screw and the moving contact are threadedly connected, and when the insulating screw rotates, it can drive the moving contact to move linearly. The operating mechanism is connected to one end of the magnetic fluid pneumatic sealing device, and the rotating shaft of the magnetic fluid pneumatic sealing device is driven by the clockwise and counterclockwise rotation of the operating mechanism, thereby driving the moving contact to realize the closing and opening functions of the isolating switch and the grounding switch. That is, through the clockwise rotation of the operating mechanism, the moving contact is pushed to insert into the high-voltage static contact; through the counterclockwise rotation of the operating mechanism, the moving contact is pushed to insert into the grounding static contact.

[0034] As an implementation mode, an inlet and outlet bushing is provided on the mechanism mounting plate, and a sealing ring is provided between the inlet and outlet bushing and the mechanism mounting plate. The inner end of the inlet and outlet bushing is electrically connected to the middle static contact through a connecting conductor.

[0035] The sealing ring realizes the sealing function. The inner end wire of the inlet and outlet bushing is connected with the connecting conductor installed on the lower side of the middle static contact, realizing the connection between the inlet and outlet lines and the isolating switch. When the inlet and outlet lines need to be connected or repaired, the clockwise and counterclockwise rotation of the operating mechanism realizes the connection, isolation and grounding functions.

[0036] As an implementation method, the two ends of the intermediate static contact are provided with a through-current spring contact finger A and a guide ring A for guiding the linear motion of the moving contact. The high-voltage static contact is provided with a through-current spring contact finger B, a guide column assembly and a guide ring B. The grounding static contact is provided with a through-current spring contact finger C and a guide ring C.

[0037] Due to the weight of the moving contact itself, it will sag in the natural state. The positioning function of the guide column and the guide ring ensures that the moving contact and the contact finger of the current-carrying spring are in uniform contact, thereby improving the current carrying capacity. Preferably, the moving contact is tubular to further reduce the weight of the moving contact itself.

[0038] As an implementation method, metal shielding covers are provided on the high-voltage static contact, the grounding static contact and both ends of the intermediate static contact. The moving contact and the metal shielding cover are preferably made of copper-dottir alloy.

[0039] As an implementation manner, the contact mechanism has multiple groups, preferably 3 groups or 2 groups. The rotating shafts of the magnetohydrodynamic sealing devices of the multiple groups of contact mechanisms are all engaged with the operating mechanism.

[0040] As an embodiment, the operating mechanism includes a rotating handle and a transmission pair, and the rotating handle drives the rotating shaft of the magnetic fluid pneumatic sealing device to rotate counterclockwise or clockwise through the transmission pair. The transmission pair is preferably a gear transmission pair. The rotating handle is convenient for the user to rotate.

[0041] Compared with conventional SF6 switchgear, the present invention has the advantage of adopting an integrated pre-assembly design concept. The present invention is installed in a compartment as a whole after overall assembly and debugging, which effectively improves production efficiency, is suitable for mass production, and reduces labor costs.

[0042] The present invention optimizes the switch contact structure and successfully achieves that the insulation level still meets the technical requirements after multiple opening and closing tests of small capacitance and small inductance. The present invention overcomes the difficulty of achieving opening and closing performance under low-frequency conditions.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated environmentally friendly gas-insulated three-position disconnector, It is characterized in that It includes a mechanism mounting plate, an operating mechanism, a contact mechanism and an insulating bracket arranged on the inner side of the mechanism mounting plate. The contact mechanism includes a grounding static contact, an intermediate static contact, a high-voltage static contact, a moving contact, an insulating screw and a magnetohydrodynamic sealing device. The grounding static contact, the intermediate static contact and the high-voltage static contact are arranged on the insulating bracket in sequence, the moving contact is correspondingly installed in the intermediate static contact, and the magnetohydrodynamic sealing device is arranged on the mechanism mounting plate; one end of the insulating screw is connected to the rotating shaft of the magnetohydrodynamic sealing device, and the other end is correspondingly connected to the moving contact thread; the operating mechanism is arranged on the outer side of the mechanism mounting plate, and is used to drive the rotating shaft of the magnetohydrodynamic sealing device to rotate, thereby driving the moving contact to move.

2. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that The mechanism installation plate is provided with an inlet and outlet wire bushing, and a sealing ring is arranged between the inlet and outlet wire bushing and the mechanism installation plate.

3. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 2, It is characterized in that The inner end of the inlet and outlet bushing is electrically connected to the middle static contact through a connecting conductor.

4. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that The two ends of the middle stationary contact are correspondingly provided with a current-carrying spring contact finger A and a guide ring A for guiding the linear motion of the moving contact.

5. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that The high-voltage static contact is provided with a flow-through spring contact finger B, a guide column assembly and a guide ring B accordingly.

6. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that A current-carrying spring contact finger C and a guide ring C are correspondingly provided in the grounding static contact.

7. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that Metal shielding covers are arranged on the high-voltage static contact, on the grounding static contact and at both ends of the middle static contact.

8. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that There are multiple groups of contact mechanisms.

9. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that The operating mechanism comprises a rotating handle and a transmission pair. The rotating handle drives the rotating shaft of the magnetohydrodynamic sealing device to rotate counterclockwise or clockwise through the transmission pair.

10. The integrated environmentally friendly gas-insulated three-position disconnector according to claim 1, It is characterized in that The moving contact is tubular.

Images