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

Abstract

An embodiment of the utility model discloses an integrated environment-friendly gas insulation three-position disconnecting switch which comprises a mechanism mounting plate, an operating mechanism, a contact mechanism and an insulation support arranged on the inner side of the mechanism mounting plate, and the contact mechanism comprises a grounding static contact, a middle static contact, a high-voltage static contact, a moving contact, an insulation lead screw 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 utility model, an integrated preassembly design concept is adopted, and the whole GIS is installed in a 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 utility model relates to the technical field of electricity, in particular to an integrated environmentally friendly gas-insulated three-position disconnector. Background Technique

[0002] Restricted by the charging current and charging power of AC submarine cables, power frequency AC power transmission is generally only applicable to the offshore wind farms with small capacity for power transmission.

[0003] For the large-capacity offshore wind power transmission solution for medium and far sea distances of offshore wind power, 20Hz low-frequency power transmission technology is adopted. By reducing the frequency to increase the cable current-carrying capacity, the effective load capacity of the cable is improved, 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 future development of medium and far sea wind power transmission technology.

[0004] In the current technology, the switchgear applied in the low-frequency system is only the traditional SF6 GIS switchgear. Its SF6 gas hardly decomposes naturally in the atmosphere, which exacerbates global warming and runs counter to the goals of carbon peak and carbon neutrality. Therefore, there is an urgent need to develop a 72.5kV integrated environmentally friendly gas-insulated three-position disconnector for low-frequency systems, which can be integrally assembled, debugged and then integrally installed in the compartment, effectively improving production efficiency, being suitable for mass production, reducing labor costs, and having certain economic benefits. Content of the Utility Model

[0005] The technical problem to be solved by the embodiment of the utility model is to provide an integrated environmentally friendly gas-insulated three-position disconnector so that it can be integrally installed in the compartment.

[0006] To solve the above technical problem, the embodiment of the utility model provides an integrated environmentally friendly gas-insulated three-position disconnector, which includes a mechanism mounting plate, an operating mechanism, a contact mechanism and an insulating bracket arranged inside 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 rod and a magnetorheological fluid dynamic 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. The magnetorheological fluid dynamic sealing device is arranged on the mechanism mounting plate. One end of the insulating screw rod is connected to the rotating shaft of the magnetorheological fluid dynamic sealing device, and the other end is correspondingly threadedly connected to the moving contact. The operating mechanism is arranged outside the mechanism mounting plate and is used to drive the rotating shaft of the magnetorheological fluid dynamic sealing device to rotate, and then drive the moving contact to move.

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

[0008] Further, the inner end of the incoming and outgoing line bushing is electrically connected to the middle static contact through a connecting conductor.

[0009] Further, current-carrying spring fingers A and a guiding ring A for guiding the linear movement of the moving contact are respectively arranged at both ends of the middle static contact.

[0010] Further, current-carrying spring fingers B, a guiding column assembly and a guiding ring B are correspondingly arranged in the high-voltage static contact.

[0011] Further, current-carrying spring fingers C and a guiding ring C are correspondingly arranged in the grounding static contact.

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

[0013] Further, there are multiple sets of contact mechanisms.

[0014] Further, the operating mechanism includes a rotating handle and a transmission pair. The rotating handle drives the rotating shaft of the magneto-hydrodynamic dynamic sealing device to rotate counterclockwise or clockwise through the transmission pair.

[0015] Further, the moving contact is tubular.

[0016] The beneficial effects of the present utility model are as follows: The present utility model realizes a large breaking distance and slow-speed closing, meets the opening and closing tests of small capacitive and small inductive currents, and the insulation level is stable after multiple opening and closing tests. The present utility model adopts the concept of integrated pre-assembly design. After overall installation and commissioning, it is integrally installed in the compartment, which is different from the traditional GIS that is assembled and debugged in a narrow compartment, effectively improving the overall production efficiency and saving labor costs. Brief Description of the Drawings

[0017] Figure 1 is the three-dimensional structure diagram of the integrated environmentally friendly gas-insulated three-position disconnector according to the embodiment of the present utility model.

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

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

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

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

[0022] Figure 6 is Figure 5 a sectional view taken along line A-A in the figure.

[0023] Figure 7 is a three-dimensional structure diagram of the contact mechanism of an embodiment of the present utility model.

[0024] Figure 8 is a three-dimensional structure diagram of the high-voltage static contact of an embodiment of the present utility model.

[0025] Explanation of the reference numerals in the drawings

[0026] Ground static contact 10, current-carrying spring finger C11, guide ring C12, metal shielding cover 13, intermediate static contact 20, current-carrying spring finger A21, guide ring A22, connecting conductor 23, high-voltage static contact 30, current-carrying spring finger B31, guide ring B32, guide post assembly 33, moving contact 40, insulating screw rod 41, magneto-rheological fluid dynamic seal device 42, mechanism mounting plate 50, insulating bracket 51, ground mounting plate 52, incoming and outgoing line bushing 53, sealing ring 54, operating mechanism 60, rotating handle 61, transmission pair 62. Detailed implementation manners

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0028] In the embodiments of the present utility model, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, in the present utility model, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0030] Please refer to Figures 1 to 8 , the integrated environmentally friendly gas-insulated three-position disconnector of the embodiment of the present utility model includes a mechanism mounting plate, an operating mechanism, a contact mechanism, and an insulating bracket.

[0031] The insulating bracket is arranged inside the mechanism mounting plate, and the operating mechanism is arranged outside the mechanism mounting plate. The mechanism mounting plate is preferably made of aluminum. The insulating bracket is composed of several support columns and support plates.

[0032] The contact mechanism includes a grounding static contact, an intermediate static contact, a high-voltage static contact, a moving contact, an insulating screw rod, and a magneto-rheological fluid dynamic sealing device. The magneto-rheological fluid dynamic sealing device is arranged on the mechanism mounting plate. The magneto-rheological fluid dynamic sealing device is an existing structure, similar to a "liquid O-ring seal", and its function is to transfer the rotational motion from the outside of the mechanism mounting plate to the insulating screw rod inside the mechanism mounting plate.

[0033] 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. One end of the insulating screw rod is connected to the rotating shaft of the magneto-rheological fluid dynamic sealing device, and the other end is correspondingly threadedly connected to the moving contact. Preferably, a grounding mounting plate is arranged inside the mechanism mounting plate. The grounding static contact is connected to the grounding mounting plate, and a grounding copper bar is led out and installed in the aluminum mechanism mounting plate to achieve connection to the ground. During specific implementation, the grounding static contact and the bus bar are installed in the grounding mounting plate, and a grounding copper plate is led out at the bus bar and connected to the mechanism mounting plate. By reversely rotating the operating mechanism, the moving contact is pulled to insert into the grounding static contact, realizing grounding on the outgoing line side or the incoming line side.

[0034] The operating mechanism is used to drive the rotation of the rotating shaft of the magneto-rheological fluid dynamic sealing device, and then drive the movement of the moving contact. That is, the insulating screw rod is installed at the end of the rotating shaft of the magneto-rheological fluid dynamic sealing device. The insulating screw rod is provided with an external thread, and the moving contact is correspondingly provided with an internal thread. The insulating screw rod and the moving contact are threadedly connected in cooperation. When the insulating screw rod rotates, it can drive the moving contact to move linearly. The operating mechanism is connected to one end of the magneto-rheological fluid dynamic sealing device. By rotating the operating mechanism clockwise and counterclockwise, the rotating shaft of the magneto-rheological fluid dynamic sealing device is driven, and then the moving contact is driven to realize the closing and opening functions of the disconnector and the earthing switch. That is, by rotating the operating mechanism clockwise, the moving contact is pushed to insert into the high-voltage static contact; by rotating the operating mechanism counterclockwise, the moving contact is pushed to insert into the grounding static contact.

[0035] As an implementation manner, inlet and outlet bushings are arranged on the mechanism mounting plate, and sealing rings are provided between the inlet and outlet bushings and the mechanism mounting plate. The inner end of the inlet and outlet bushing is electrically connected to the intermediate static contact through a connecting conductor.

[0036] The sealing ring realizes the sealing function. The wire at the inner end of the inlet and outlet bushing is connected to the connecting conductor installed on the lower side of the intermediate static contact, realizing the connection between the incoming and outgoing line and the disconnector. When the incoming and outgoing line needs to be connected or repaired, the connection, isolation, and grounding functions are realized through the clockwise and counterclockwise rotation operations of the operating mechanism.

[0037] As an implementation manner, current-carrying spring fingers A for guiding the linear movement of the moving contact and a guide ring A are correspondingly arranged at both ends of the intermediate static contact. Current-carrying spring fingers B, a guide post assembly, and a guide ring B are correspondingly arranged in the high-voltage static contact. Current-carrying spring fingers C and a guide ring C are correspondingly arranged in the grounding static contact.

[0038] Due to the weight of the moving contact itself, there will be a sagging phenomenon in the natural state. Through the positioning function of the guiding column and the guiding ring, it is ensured that the moving contact is in uniform contact with the current-carrying spring finger, improving the current-carrying capacity. Preferably, the moving contact is tubular, further reducing the weight of the moving contact itself.

[0039] As an implementation manner, metal shielding covers are provided at both ends of the high-voltage static contact, the grounding static contact, and the intermediate static contact. The moving contact and the metal shielding cover are preferably made of copper-tungsten alloy.

[0040] As an implementation manner, there are multiple groups of contact mechanisms, 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.

[0041] As an implementation manner, the operating mechanism includes 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. The transmission pair is preferably a gear transmission pair. The rotating handle is convenient for the user to rotate.

[0042] Compared with the conventional SF6 switchgear, the advantage of the present utility model lies in adopting the concept of an integrated pre-assembly design. After overall assembly and debugging, the present utility model is integrally installed in the compartment, effectively improving the production efficiency, being suitable for mass production, and reducing the labor cost.

[0043] Through the optimization of the switch contact structure, the present utility model has successfully achieved that the insulation level still meets the technical requirements after multiple opening and closing tests of small capacitance and small inductance. The present utility model has overcome the problem that it is difficult to achieve the opening and closing performance under low-frequency working conditions.

[0044] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. An integrated environmentally friendly gas-insulated three-position disconnector, 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, 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, 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, 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, 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, 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, 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, characterized in that: There are multiple groups of contact mechanisms.

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

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