Enclosed ice-melting isolating switch

Abstract

A closed ice-melting isolating switch and grounding switch relates to the technical field of isolating switches and grounding switches and is used for solving the problems that an existing open isolating switch and grounding switch is large in occupied space, and conductive and transmission mechanisms are easily affected by wind, sand, rain and snow to be rusted, jammed and frozen. Comprising a high-voltage conducting rod, a high-voltage sleeve, a shell, a low-voltage conducting rod, a low-voltage sleeve, a static contact seat, a main knife operating mechanism and a transmission mechanism, the high-voltage sleeve and the low-voltage sleeve are fixedly connected with the shell, the high-voltage conducting rod is fixed in the high-voltage sleeve, one end of the high-voltage conducting rod is provided with a high-voltage wiring terminal, and the static contact seat is fixed at the other end of the high-voltage conducting rod. The low-voltage conducting rod is fixed in the low-voltage sleeve, one end of the low-voltage conducting rod is provided with a low-voltage wiring terminal, the main knife operating mechanism is located at the bottom of the shell, the transmission mechanism comprises a transmission rod, the transmission rod is provided with a moving contact, and the main knife operating mechanism drives the moving contact to be in contact with or separated from the static contact seat. The device is small in occupied space and not prone to being jammed.

Description

Technical Field

[0001] The utility model relates to the technical field of disconnectors and earthing switches, in particular to a closed-type ice-melting disconnector. Background Technique

[0002] At present, the climate environment is changeable, and the situation of transmission lines icing is increasing. Not only are the lines in the southern regions seriously iced, but the icing situation in some northern cities is also increasing. Icing increases the load on the conductors. In the long run, it will cause certain mechanical damage to the conductors, iron towers, etc. In severe cases, it will lead to wire breakage and iron tower collapse, ultimately causing large-scale power outages. Therefore, it is very important to strengthen the research on ice-melting technology. DC ice-melting is the most effective way to melt ice on the line. Usually, an open-type ice-melting disconnector is used to introduce the DC ice-melting system in the substation into the transmission line, so that the line is de-iced through the principle of large-current Joule heat on the line. The open-type ice-melting disconnector is also severely iced itself due to environmental influence, resulting in a refusal to close. Manual de-icing is required, which poses risks to personnel safety, has a high labor intensity, low efficiency, and is prone to equipment damage. This is a major pain point in DC ice-melting. And solutions such as ice-melting vehicles, steam ice-melting, and adding ice-melting pipe busbars for ice-melting all have certain limitations.

[0003] Chinese Patent No. 2022114718981 discloses a closed-type ice-melting disconnector. The low-voltage side housing is fixedly installed at one end of the fully enclosed housing, and the low-voltage side housing is communicated with the fully enclosed housing. A static-side conductive assembly electrically connected to the low-voltage side conductive rod is fixedly installed inside the low-voltage side housing. A moving-side conductive assembly is fixedly installed inside the fully enclosed housing. The moving-side conductive assembly is electrically connected to the high-voltage side conductive rod. There is a gap between the moving-side conductive assembly and the static-side conductive assembly. The electric mechanism drives the moving contact to reciprocate towards the position of the static-side conductive assembly through a transmission mechanism for opening and closing actions. The transmission mechanism of the closed-type ice-melting disconnector of the utility model is enclosed and built-in, and can be completely unaffected by the external ice layer, and can quickly, efficiently and safely de-ice the iced line, can solve the problem that the traditional ice-melting switch cannot self-melt ice after icing, completely eliminate the lag in operation before line de-icing, and improve the reliability of de-icing. The defects of the above-mentioned existing technology are: ① The electric mechanism is arranged on the side, and the overall structure has a large lateral dimension and occupies a large space; ② The transmission mechanism is externally exposed, and is prone to jamming due to the influence of wind and sand, and is prone to rust due to the influence of freezing. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a closed-type ice-melting disconnector, which is used to solve the problems that the existing open-type disconnector and earthing switch occupy a large space, and the conductive and transmission mechanisms are prone to rust, jamming and freezing due to the influence of wind, sand, rain and snow.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a closed - type ice - melting disconnector, which includes a high - voltage conductive rod, a high - voltage bushing, a housing, a low - voltage conductive rod, a low - voltage bushing, a static contact seat, a main knife operating mechanism and a transmission mechanism. The high - voltage bushing and the low - voltage bushing are both fixedly connected to the housing. The high - voltage conductive rod is fixed inside the high - voltage bushing. One end of the high - voltage conductive rod has a high - voltage terminal extending out of the high - voltage bushing. The static contact seat is fixed at the other end of the high - voltage conductive rod. The low - voltage conductive rod is fixed inside the low - voltage bushing. One end of the low - voltage conductive rod has a low - voltage terminal extending out of the low - voltage bushing. It is characterized in that the main knife operating mechanism is located at the bottom of the housing. The transmission mechanism includes a transmission rod. The transmission rod is provided with a moving contact. The static contact seat and the moving contact are arranged vertically. The inside of the housing is a lower cavity. An upper cavity is formed between the high - voltage bushing and the housing. And the upper cavity and the lower cavity are independently arranged. Both the upper cavity and the lower cavity are filled with SF 6 gas. The main knife operating mechanism drives the moving contact to move up and down through the transmission rod, so that the moving contact contacts or separates from the static contact seat. And after the moving contact contacts the static contact seat, the ice - melting circuit is connected. After the moving contact separates from the static contact seat, the ice - melting circuit is disconnected.

[0006] Further, a transition cylinder is provided between the high - voltage bushing and the first housing. One end of the transition cylinder is fixedly connected to the high - voltage bushing, and the other end of the transition cylinder is fixedly connected to the first housing.

[0007] Further, a first pot - type insulator is provided between the other end of the transition cylinder and the first housing. The first pot - type insulator separates the upper cavity and the lower cavity, so that the upper cavity and the lower cavity are independently arranged.

[0008] Further, the housing includes a first housing and a second housing. The first housing and the second housing are fixedly connected and there is a second pot - type insulator between them. The second pot - type insulator, the first housing and the high - voltage bushing form a high - voltage side. The second pot - type insulator, the second housing and the low - voltage bushing form a low - voltage side. The static contact seat, the moving contact and the transmission rod are located on the high - voltage side of the lower cavity.

[0009] Further, a first conductor is provided in the lower cavity of the high - voltage side. The first conductor includes two parts arranged left and right. The other end of the low - voltage conductive rod is electrically connected to the first conductor through a second conductor. The moving contact is located between the two parts of the first conductor and always keeps in contact with the first conductor.

[0010] Further, a first shielding cover is provided at the lower part of the high - voltage bushing and is located outside the high - voltage conductive rod.

[0011] Further, a second shielding cover is provided outside the static contact seat.

[0012] Further, a grounding switch and an operating mechanism are fixed on the first housing. The grounding switch and the operating mechanism are used to manipulate the grounding switch contact to contact or separate from the first conductor, so as to realize the closing or opening of the grounding switch.

[0013] Further, the side walls of the transition cylinder and the second housing are provided with molecular sieves.

[0014] The beneficial effects of the present utility model are as follows: The main knife operating mechanism of the present utility model is arranged at the bottom of the housing, reducing the lateral dimension of the entire disconnector; the transmission mechanism is located inside the housing and will not be affected by freezing and sand, so the work is reliable and maintenance-free. The present utility model uses SF 6 gas insulation, and all operating links are completely enclosed, not affected by external rain and snow weather. When grounding is required, by closing the grounding switch, the ice-melting disconnector becomes a grounding switch, which can protect the line equipment, and the grounding switch is not affected by the external environment either. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the present utility model;

[0016] Figure 2 is the sectional view of the present utility model;

[0017] In the figure: 1 high-voltage terminal, 2 grading ring, 3 high-voltage bushing, 4 first shielding cover, 5 high-voltage conducting rod, 6 transition cylinder, 7 molecular sieve, 8 second shielding cover, 9 static contact seat, 10 first pot-type insulator, 10' second pot-type insulator, 11 grounding switch and operating mechanism, 12 moving contact, 13 first conductor, 14 first housing, 15 main knife operating mechanism, 16 second conductor, 17 second housing, 18 low-voltage bushing, 19 low-voltage conducting rod, 20 low-voltage terminal, 21 base, 22 control cabinet, 23 transmission rod, 24 high-voltage side, 25 low-voltage side, 26 upper cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] As Figure 1 、 Figure 2 shown, the present utility model includes a high-voltage bushing 3, a high-voltage conducting rod 5, a housing, a low-voltage bushing 18, a low-voltage conducting rod 19, a main knife operating mechanism 15 and a transmission mechanism. The structure and working principle of the present utility model will be described in detail below with reference to the accompanying drawings.

[0019] As Figure 1 、 Figure 2As shown in the figure, the enclosed ice-melting disconnector of the present utility model includes a high-voltage conductive rod 5, a high-voltage bushing 3, a housing, a low-voltage conductive rod 19, a low-voltage bushing 18, a static contact seat 9, a main knife operating mechanism 15 and a transmission mechanism. The housing is the basic component of the present utility model, and most of the other components are installed on the housing. The housing is fixed on the base 21, and a control cabinet 22 is also provided on the base 21. As Figure 2 shown, the housing includes a first housing 14 and a second housing 17. The first housing 14 has four interfaces, which are located in the upper, lower, left, and right four directions respectively. The second housing 17 has three interfaces, which are located in the upper, left, and right three directions respectively. The interface on the right side of the first housing 14 is fixedly connected to the interface on the left side of the second housing 17 and is separated by a second pot-type insulator 10' therebetween. The second pot-type insulator 10' is an air-permeable structure, and thus the first housing 14 is communicated with the second housing 17. Both the high-voltage bushing 3 and the low-voltage bushing 18 are fixedly connected to the housing. Specifically, there is a transition cylinder 6 between the high-voltage bushing 3 and the interface on the upper side of the first housing 14. The upper end of the transition cylinder 6 is fixedly connected to the lower end of the high-voltage bushing 3, and the lower end of the transition cylinder 6 is fixedly connected to the interface on the upper side of the first housing 14. The lower end of the low-voltage bushing 18 is fixedly connected to the interface on the upper side of the second housing 17. A high-voltage side 24 is formed between the second pot-type insulator 10' and the first housing 14 and the high-voltage bushing 3, and a low-voltage side 25 is formed between the second pot-type insulator 10' and the second housing 17 and the low-voltage bushing 18. A first pot-type insulator 10 is provided between the lower end of the transition cylinder 6 and the interface on the upper side of the first housing 14. The first pot-type insulator 10 is a closed structure. The upper cavity 26 is above the first pot-type insulator 10, and the inner cavity of the housing is the lower cavity. The upper cavity 26 and the lower cavity are separated by the first pot-type insulator 10 and are independent of each other. Both the upper cavity 26 and the lower cavity are filled with SF 6 gas. To facilitate the filling of SF 6 gas, gas filling valves are provided on the side wall of the transition cylinder 6 and the side wall of the second housing 17. A grading ring 2 is provided on the periphery of the upper end of the high-voltage bushing 3. When the SF 6 gas pressure in the upper cavity 26 or the lower cavity is insufficient due to gas leakage, the gas can be supplemented through the gas filling valve; by separating the upper cavity 26 and the lower cavity with the first pot-type insulator 10, rapid gas supplementation to the upper cavity 26 or the lower cavity can be achieved. And the volume of the upper cavity 26 is larger than the volume of the lower cavity. The volume of the lower cavity is small and it is easy to fill with gas. In special working conditions, the lower cavity can be specially pressurized and then used for short-term special use.

[0020] As Figure 2As shown in the figure, the high-voltage conductive rod 5 is fixed inside the high-voltage bushing 3. One end of the high-voltage conductive rod 5 has a high-voltage terminal 1 extending out of the high-voltage bushing 3, and the high-voltage terminal 1 is used to connect with the line. The static contact seat 9 is fixed at the other end of the high-voltage conductive rod 5 and is located inside the high-voltage side 24 of the lower cavity. The lower end of the high-voltage conductive rod 5 penetrates through the center of the first pot-type insulator 10. The low-voltage conductive rod 19 is fixed inside the low-voltage bushing 18, and the low-voltage conductive rod 19 is located inside the low-voltage side 25. One end of the low-voltage conductive rod 19 has a low-voltage terminal 20 extending out of the low-voltage bushing 18, and the low-voltage terminal 20 is used to connect with the line.

[0021] The main knife operating mechanism 15 is located at the bottom of the first housing 14. The transmission mechanism includes a transmission rod 23. The upper end of the transmission rod 23 has a moving contact 12, and the moving contact 12 is in relative screw fit with the transmission rod 23. The main knife operating mechanism 15 is used to drive the rotation of the transmission rod 23, thereby causing the moving contact 12 to move up and down. The static contact seat 9 and the moving contact 12 are arranged vertically. The high-voltage conductive rod 5, the static contact seat 9, the moving contact 12, and the transmission rod 23 are all located on the high-voltage side 24, and the moving contact 12, the transmission rod 23, and the static contact seat 9 are located on the high-voltage side 24 of the lower cavity. The main knife operating mechanism 15 drives the transmission rod 23 to rotate, thereby causing the moving contact 12 to contact or separate from the static contact seat 9.

[0022] As Figure 2 shown in the figure, the lower cavity of the high-voltage side 24 has a first conductor 13. The first conductor 13 includes two parts arranged left and right, and both parts are elastic members. The other end of the low-voltage conductive rod 19 extends into one end of the second conductor 16, and the other end of the second conductor 16 is electrically connected to the first conductor 13. Thus, the low-voltage conductive rod 19 is electrically connected to the first conductor 13 through the second conductor 16. The moving contact 12 is located between the two parts of the first conductor 13, and the moving contact 12 always remains in contact with the first conductor 13. During the upward movement of the moving contact 12, it remains in contact with the first conductor 13 until the moving contact 12 contacts the static contact seat 9. The moving contact 12 is electrically connected to the low-voltage conductive rod 19 through the first conductor 13 and the second conductor 16. At this time, the high-voltage conductive rod 5 is electrically connected to the low-voltage conductive rod 19 through the static contact seat 9, the moving contact 12, the first conductor 13, the second conductor 16, and the low-voltage conductive rod 19. Thus, the ice melting circuit is connected, and the ice melting operation can be carried out at this time.

[0023] To shield the electric field, the lower part of the high-voltage bushing 3 has a first shielding cover 4 located around the high-voltage conductive rod 5, and the periphery of the static contact seat 9 has a second shielding cover 8.

[0024] As Figure 1 、 Figure 2As shown in the figure, a grounding switch and an operating mechanism 11 are fixed on the side wall of the first housing 14. The grounding switch and the operating mechanism 11 are used to operate the grounding switch contact to contact or separate from the first conductor 13, so as to realize electrical connection or separation. Specifically, the grounding switch and the operating mechanism 11 include a grounding switch and an operating mechanism. The operating mechanism acts to electrically connect the grounding switch to the first conductor 13 to achieve grounding. Furthermore, the utility model is both a disconnector and can be used as a grounding switch.

[0025] As Figure 2 shown, the side walls of the transition cylinder 6 and the second housing 14 are provided with molecular sieves 7. The molecular sieves 7 are filled with a filler, and the filler is used to absorb the moisture in the SF 6 gas in the upper cavity 26 and the lower cavity, as well as the harmful decomposition products generated by the decomposition of the SF 6 gas.

[0026] A method for using a closed-type ice-melting disconnector of the utility model includes the following steps:

[0027] S1. When not melting ice, the moving contact 12 is separated from the static contact seat 9;

[0028] S2. When ice melting is required, the moving contact 12 is brought into contact with the static contact seat 6. At this time, the high-voltage conductive rod 5 is connected to the low-voltage conductive rod 19, and the line generates heat to melt the ice;

[0029] S3. When grounding is required, on the premise that the moving contact 12 is in contact with the static contact seat 9, the grounding switch is connected to the first conductor 13 through the grounding switch and the operating mechanism 11, or when the moving contact 12 is separated from the static contact seat 9, the grounding switch is connected to the first conductor 13 through the grounding switch and the operating mechanism 11.

[0030] The utility model arranges the main knife operating mechanism at the bottom of the housing, reducing the lateral dimension of the entire disconnector; the transmission mechanism is located inside the housing and will not be affected by freezing, sand and wind, so the work is reliable and maintenance-free. The utility model uses SF 6 gas insulation, and all operating links are completely enclosed, not affected by external rain and snow weather. When grounding is required, by closing the grounding switch, the ice-melting disconnector becomes a grounding switch, which can protect the line equipment, and the grounding switch is not affected by the external environment.

Claims

1. A closed ice-melting disconnector, comprising a high-voltage conductive rod, a high-voltage bushing, a housing, a low-voltage conductive rod, a low-voltage bushing, a static contact seat, a main knife operating mechanism and a transmission mechanism, wherein the high-voltage bushing and the low-voltage bushing are both fixedly connected to the housing, the high-voltage conductive rod is fixed in the high-voltage bushing, one end of the high-voltage conductive rod has a high-voltage terminal extending out of the high-voltage bushing, the static contact seat is fixed at the other end of the high-voltage conductive rod, the low-voltage conductive rod is fixed in the low-voltage bushing, one end of the low-voltage conductive rod has a low-voltage terminal extending out of the low-voltage bushing, and the characteristics are: The main knife operating mechanism is located at the bottom of the shell, the transmission mechanism includes a transmission rod, the transmission rod is provided with a moving contact, the static contact seat and the moving contact are arranged up and down, the interior of the shell is a lower cavity, an upper cavity is formed between the high-voltage bushing and the shell, and the upper cavity and the lower cavity are independently arranged, and the upper cavity and the lower cavity are both filled with SF6 gas. The main knife operating mechanism drives the moving contact to move up and down through the transmission rod, thereby making the moving contact contact or separate from the static contact seat, and the ice-melting circuit is connected after the moving contact contacts the static contact seat, and the ice-melting circuit is disconnected after the moving contact separates from the static contact seat.

2. The enclosed ice-melting disconnector according to claim 1, characterized in that: A transition sleeve is provided between the high-voltage bushing and the first shell, one end of the transition sleeve is fixedly connected to the high-voltage bushing, and the other end of the transition sleeve is fixedly connected to the first shell.

3. The enclosed ice-melting disconnector according to claim 2, characterized in that: A first pot-type insulator is provided between the other end of the transition cylinder and the first shell, and the first pot-type insulator separates the upper cavity from the lower cavity so that the upper cavity and the lower cavity are independently arranged.

4. The enclosed ice-melting disconnector according to claim 3, characterized in that: The shell includes a first shell and a second shell, the first shell is fixedly connected to the second shell and a second pot-type insulator is provided therebetween, a high-voltage side is formed between the second pot-type insulator and the first shell and the high-voltage bushing, a low-voltage side is formed between the second pot-type insulator and the second shell and the low-voltage bushing, and the static contact seat, the moving contact and the transmission rod are located on the high-voltage side of the lower cavity.

5. The enclosed ice-melting disconnector according to claim 4, characterized in that: A first conductor is provided in the lower cavity on the high-voltage side. The first conductor includes two parts arranged on the left and right. The other end of the low-voltage conductive rod is electrically connected to the first conductor through the second conductor. The moving contact is located between the two parts of the first conductor and the moving contact always keeps in contact with the first conductor.

6. The enclosed ice-melting disconnector according to claim 1, characterized in that: The lower part of the high voltage bushing is provided with a first shielding cover located at the periphery of the high voltage conductive rod.

7. The enclosed ice-melting disconnector according to claim 1, characterized in that: The periphery of the stationary contact seat is provided with a second shielding cover.

8. The enclosed ice-melting disconnector according to claim 5, characterized in that: The first housing is fixed with a grounding switch and an operating mechanism, and the grounding switch and the operating mechanism are used to manipulate the grounding switch contact to contact or separate with the first conductor to achieve closing or opening of the grounding switch.

9. The enclosed ice-melting disconnector according to claim 2, characterized in that: The side walls of the transition cylinder and the second shell are provided with molecular sieves.

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