High-voltage direct-current deicing isolating switch

Abstract

The utility model relates to a high-voltage direct-current deicing isolating switch, which is structurally characterized in that a 550KV post insulator and a 35KV post insulator are parallelly arranged at the top of a base, a grading ring is arranged at the top of the 550KV post insulator, a static contact is arranged on the grading ring, and a main knife switch with a bending structure is arranged between the 35KV post insulator and the static contact; a bending control mechanism is arranged at the bottom of the main knife switch; an electric operating mechanism at the bottom of the base is connected with the bending control mechanism through an operating rod; and after the main knife switch is unfolded, the contact plate at the top is plugged with the static contact. According to the structure of the high-voltage direct-current ice-melting isolating switch, the conductive section of the conductive tube is increased, and the through-current capability of a product is improved; the main knife switch adopts a bending structure and has the characteristics of flexible rotation and strong corrosion resistance; the structure of the product is simplified, the later maintenance is facilitated, the maintenance period is prolonged, and the stability of switching-off and switching-on operation after the product runs for many years is ensured.

Description

Technical Field

[0001] This utility model relates to a high-voltage DC de-icing disconnect switch, particularly a high-voltage DC de-icing disconnect switch with a vertical break, belonging to the technical field of ultra-high voltage power equipment. Background Technology

[0002] In low-temperature environments, transmission lines are prone to icing, leading to increased conductor weight, bending, and sagging. When the icing exceeds the conductor's load-bearing capacity, it can cause line breakage and power outages. High-voltage de-icing disconnect switches are crucial switching devices used for de-icing transmission lines. With the continuous development of the power industry and advancements in power equipment technology, power systems have placed demands on de-icing disconnect switches for simplified structure, ease of operation, reliable performance, long service life, and convenient installation and maintenance.

[0003] Existing 550kV high-voltage disconnect switches with vertical breaks have the following shortcomings: First, the product structure generally adopts a clamp-type structure. This structure has a complex moving contact structure, and the transmission components are all inside the conductive tube, making inspection and maintenance inconvenient. The clamp-type structure has relatively few contact points between the moving and stationary contacts, resulting in poor current carrying capacity and greater susceptibility to external environmental influences. The disconnect switch is prone to not straightening, leading to decreased contact clamping force, increased contact resistance, and easy overheating of the contacts. Second, the transmission structure is a gear and rack structure, which has a complex assembly process and requires high-quality heat treatment of the gears and racks, making them prone to tooth damage and increasing the workload of inspection and maintenance. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a high-voltage DC de-icing disconnect switch. The structure of this high-voltage DC de-icing disconnect switch increases the conductive cross-section of the conductive tube, thereby improving the current carrying capacity of the product. The main switch adopts a bent structure, which has the characteristics of flexible rotation and strong corrosion resistance. The product structure is simplified, which facilitates later maintenance, extends the maintenance cycle, and ensures the stability of opening and closing operations after many years of product operation.

[0005] To solve the above problems, the specific technical solution of this utility model is as follows: A high-voltage DC de-icing disconnect switch, wherein a 550KV post insulator and a 35KV post insulator are arranged side by side on the top of the base, an equalizing ring is provided on the top of the 550KV post insulator, a stationary contact is provided on the equalizing ring, and a main switch with a bent structure is provided between the 35KV post insulator and the stationary contact; a bending control mechanism is provided at the bottom of the main switch, and an electric operating mechanism at the bottom of the base is connected to the bending control mechanism through an operating rod; after the main switch is unfolded, the contact plate at the top is inserted into the stationary contact.

[0006] The main switch includes an upper conductive tube, a lower conductive tube, and a contact plate. A rotating frame is connected to the lower end of the lower conductive tube, and the rotating frame is hinged to the base via a pin. The upper end of the lower conductive tube is hinged to the upper conductive tube via a joint assembly. The top of the upper conductive tube is connected to the contact plate. A crank arm is connected to the base via a rotating shaft. One end of the crank arm is connected to one end of a pull rod assembly, and the other end of the pull rod assembly passes through the hollow lower conductive tube and is connected to the joint assembly. The rotating shaft, which is fixedly connected to the other end of the crank arm, passes through the base and connects to the 35KV operating insulator. The output shaft of the electric operating mechanism rotates and outputs, and controls the rotation of the 35KV operating insulator via an operating lever.

[0007] The joint assembly includes an upper joint, a lower joint, a pull plate, a support plate, and a joint weld. The upper and lower joints are U-shaped structures with open and interlocking joints. One end of the upper joint, lower joint, and support plate is hinged together by a first hinge axis. The top of the pull rod assembly extends from the lower conductive tube and connects to the joint weld. The joint weld is an L-shaped structure with the top bent outwards. The vertical end of the joint weld is hinged to one end of the pull plate by a fourth hinge axis, and the horizontal end of the joint weld is hinged to the other end of the support plate by a third hinge axis. A second hinge axis is also provided on the upper joint, and the other end of the pull plate is hinged to the upper joint by the second hinge axis.

[0008] The tie rod assembly includes a main tie rod and an auxiliary tie rod; one end of the main tie rod is hinged to the crank arm, and the other end of the main tie rod is hinged to one end of the curved crank arm. The other end of the curved crank arm and the rotating frame are hinged to the lug structure of the machine base through a horizontal shaft; one end of the auxiliary tie rod is hinged to the lug set in the middle of the machine base through a pin, and the other end of the auxiliary tie rod is hinged to the extension tie rod. The extension tie rod extends out of the lower conductive tube and is assembled and connected to the joint.

[0009] The extension rod has a roller at the bottom hinge, which rolls in cooperation with the inner cavity of the rotating frame. A limiting plate is provided on the extension rod, and a fixing sleeve is provided in the middle inner cavity of the lower conductive tube. The balance spring is coaxially cooperated with the extension rod, with one end supported on the fixing sleeve and the other end supported on the limiting plate.

[0010] The stationary contact includes a stationary contact base, contact fingers, and a spring; a terminal block is connected to the top of the equalizing ring via a steel bracket, the end of the terminal block extends outward and connects to the stationary contact base, stationary contact plates are respectively provided on both sides of the lower part of the stationary contact base, and contact fingers are respectively provided on the inner side of the stationary contact plates, with the outer end of the contact fingers supported and positioned by springs; the contact plate has a blade-type structure and is inserted into the two contact fingers.

[0011] The bottom fixing structure of the stationary contact seat is connected to a guide plate, and the bottom of the guide plate is a tapered opening.

[0012] The bottom of the stationary contact base is connected to a rain cover, which protects the stationary contact plate and the contact finger.

[0013] The high-voltage DC de-icing disconnect switch of this application adopts the above structure and has the following advantages:

[0014] 1. The main switch is a four-bar linkage structure, not a gear and rack structure. The assembly process is simple. The rotating parts use sealed bearings and oil-free self-lubricating maintenance-free bushings. It has the characteristics of flexible rotation and strong corrosion resistance. It is simple and convenient to install and debug, and easy to maintain and repair.

[0015] 2. The product's moving contact and stationary contact adopt a "double contact" insertion structure. In this structure, the moving contact is a blade-type structure, and the stationary contact is a U-shaped contact finger structure. It is a double contact surface and double contact point structure. At the same time, the number of contact finger pairs is large, the conductive contact surface of the moving and stationary contacts is large, and the current carrying capacity is strong and stable.

[0016] 3. The contact spring is an external pressure structure. The spring does not carry current and will not heat up, thus affecting the contact pressure change.

[0017] 4. The stationary contact is equipped with a rain cover and guide plate, which can effectively protect the moving and stationary contacts from external rain, snow and other factors. Attached Figure Description

[0018] Figure 1 This is the front view of a high-voltage DC de-icing isolating switch.

[0019] Figure 2 This is a side view of a high-voltage DC de-icing isolating switch.

[0020] Figure 3 A schematic diagram of the main switch structure.

[0021] Figure 4 This is an assembly drawing for the stationary contact.

[0022] Figure 5 Diagram showing the opening and closing process of the main switch.

[0023] Figure 6 This is a structural diagram showing the joint assembly in its open state.

[0024] Figure 7 This is a structural diagram of the joint in its assembled closed state.

[0025] Figure 8 A perspective view of the main switch opening and closing process.

[0026] Figure 9 Diagram of the bottom crank arm connection structure of the main switch.

[0027] Figure 10 This is a diagram showing the connection structure of the tie rod assembly inside the rotating frame.

[0028] Figure 11 This is a diagram showing the connection structure between the tie rod assembly and the extension tie rod. Detailed Implementation

[0029] like Figure 1 and Figure 2 As shown, a high-voltage DC de-icing disconnector has a 550kV post insulator 3 and a 35kV post insulator 5 arranged side by side on the top of the base 7. An equalizing ring 2 is provided on the top of the 550kV post insulator 3, and a stationary contact 1 is provided on the equalizing ring 2. A main switch 4 with a bending structure is provided between the 35kV post insulator 5 and the stationary contact 1. A bending control mechanism is provided at the bottom of the main switch 4. An electric operating mechanism 9 at the bottom of the base 7 is connected to the bending control mechanism through an operating rod 8. After the main switch 4 is unfolded, the contact plate 4-1 at the top is inserted into the stationary contact 1.

[0030] like Figure 3 and Figure 5 As shown, the main switch 4 includes an upper conductive tube 4-2, a lower conductive tube 4-5, and a contact plate 4-1. A rotating frame 4-3 is connected to the lower end of the lower conductive tube 4-5, and the rotating frame 4-3 is hinged to the base 4-6 via a pin. The upper end of the lower conductive tube 4-5 is hinged to the upper conductive tube 4-2 via a joint assembly 4-4. The top of the upper conductive tube 4-2 is connected to the contact plate 4-1. A crank arm 4-7 is connected to the base 4-6 via a rotating shaft. One end of the crank arm 4-7 is connected to one end of a pull rod assembly 4-8, and the other end of the pull rod assembly 4-8 passes through the hollow lower conductive tube 4-5 and is connected to the joint assembly 4-4. The rotating shaft, which is fixedly connected to the other end of the crank arm 4-7, passes through the base 4-6 and is connected to the 35KV operating insulator 4-9. The output shaft of the electric operating mechanism 9 rotates and outputs, and the 35KV operating insulator 4-9 is rotated via the operating rod 8.

[0031] like Figure 6 and Figure 7 As shown, the joint assembly 4-4 includes an upper joint 41, a lower joint 42, a pull plate 43, a support plate 44, and a joint welding assembly 45. The upper joint 41 and the lower joint 42 are U-shaped structures with open and interlocking openings. One end of the upper joint 41, the lower joint 42, and the support plate 44 are hinged together by a first hinge shaft 47. The top of the pull rod assembly 4-8 extends from the lower conductive tube 4-5 and connects to the joint welding assembly 45. The joint welding assembly 45 is an L-shaped structure with the top bent outwards. The vertical end of the joint welding assembly 45 is hinged to one end of the pull plate 43 by a fourth hinge shaft 49, and the horizontal end of the joint welding assembly 45 is hinged to the other end of the support plate 44 by a third hinge shaft 48. A second hinge shaft 46 is also provided on the upper joint 41, and the other end of the pull plate 43 is hinged to the upper joint 41 by the second hinge shaft 46.

[0032] like Figures 8 to 10As shown, the tie rod assembly 4-8 includes a main tie rod 51 and an auxiliary tie rod 59; one end of the main tie rod 51 is hinged to the crank arm 4-7, and the other end of the main tie rod 51 is hinged to one end of the curved crank arm 52. The other end of the curved crank arm 52 and the rotating frame 4-3 are hinged to the lug structure of the base 4-6 through the horizontal shaft 53; one end of the auxiliary tie rod 59 is hinged to the lug set in the middle of the base 4-6 through the pin, and the other end of the auxiliary tie rod 59 is hinged to the extension tie rod 54. The extension tie rod 54 extends out of the lower conductive tube 4-5 and connects to the joint assembly 4-4.

[0033] like Figure 8 and Figure 11 As shown, a roller 55 is provided at the bottom hinge of the extension rod 54, and the roller 55 rolls with the inner cavity of the rotating frame 4-3; a limiting plate 56 is provided on the extension rod 54, and a fixing sleeve 57 is provided in the middle inner cavity of the lower conductive tube 4-5; a balance spring 58 is coaxially engaged with the extension rod 54, with one end supported on the fixing sleeve 57 and the other end supported on the limiting plate 56.

[0034] like Figure 4 As shown, the stationary contact 1 includes a stationary contact base 1-3, contact fingers 1-4, and a spring 1-5. A terminal block 1-2 is connected to the top of the equalizing ring 2 via a steel bracket 1-1. The end of the terminal block 1-2 extends outward and connects to the stationary contact base 1-3. Stationary contact plates 1-8 are respectively provided on both sides of the lower part of the stationary contact base 1-3. Contact fingers 1-4 are respectively provided on the inner side of the stationary contact plates 1-8. The outer ends of the contact fingers 1-4 are supported and positioned by the spring 1-5. The contact plate 4-1 has a blade-type structure and is inserted into the two contact fingers 1-4. The bottom fixing structure of the stationary contact base 1-3 is connected to a guide plate 1-7, the bottom of which has a tapered opening. A rain cover 1-6 is connected to the bottom of the stationary contact base 1-3, and the rain cover 1-6 shields the stationary contact plates 1-8 and contact fingers 1-4. The product's moving and stationary contacts utilize a "double-contact" insertion structure. This structure features a blade-type moving contact and a U-shaped stationary contact with its contact fingers, creating a double-contact, double-point structure. The numerous contact finger pairs result in a large conductive contact area between the moving and stationary contacts, leading to strong and stable current-carrying capacity. The contact finger springs are externally compressed; since the springs do not carry current, they do not generate heat and thus do not affect contact pressure changes. Furthermore, the stationary contact is equipped with a rain cover and guide plate, effectively protecting the moving and stationary contacts from external factors such as rain and snow.

[0035] The working process of the high-voltage DC de-icing disconnect switch in this application is as follows:

[0036] The electric operating mechanism 9 operates, controlling the rotation of the operating lever 8 and the 35KV operating insulator 4-9. The 35KV operating insulator 4-9 is connected to the lower conductive tube 4-5 via the base 4-9. This, in turn, drives the upper conductive tube 4-2 and the contact plate 4-1 through the joint assembly 4-4. When the upper conductive tube 4-2 moves the contact plate 4-1 upwards from the horizontal position until it inserts into the contact finger 1-4 of the stationary contact, the closing operation is completed. In the reverse direction, the contact plate 4-1 is pulled out from the contact finger 1-4 of the stationary contact, then moves downwards, finally reaching the horizontal position, completing the opening operation.

Claims

1. A high-voltage DC de-icing disconnect switch, characterized in that: A 550KV post insulator (3) and a 35KV post insulator (5) are arranged side by side on the top of the base (7). An equalizing ring (2) is provided on the top of the 550KV post insulator (3). A stationary contact (1) is provided on the equalizing ring (2). A main switch (4) with a bending structure is provided between the 35KV post insulator (5) and the stationary contact (1). A bending control mechanism is provided at the bottom of the main switch (4). An electric operating mechanism (9) at the bottom of the base (7) is connected to the bending control mechanism through an operating rod (8). After the main switch (4) is unfolded, the contact plate (4-1) at the top is inserted into the stationary contact (1).

2. The high-voltage DC de-icing disconnect switch according to claim 1, characterized in that: The main switch (4) includes an upper conductive tube (4-2), a lower conductive tube (4-5), and a contact plate (4-1). A rotating frame (4-3) is connected to the lower end of the lower conductive tube (4-5), and the rotating frame (4-3) is hinged to the base (4-6) via a pin. The upper end of the lower conductive tube (4-5) is hinged to the upper conductive tube (4-2) via a joint assembly (4-4). The top of the upper conductive tube (4-2) is connected to the contact plate (4-1). The base (4-6) is connected to the contact plate via a rotating shaft. The crank arm (4-7) is connected to one end of the pull rod assembly (4-8), and the other end of the pull rod assembly (4-8) passes through the hollow lower conductive tube (4-5) and is connected to the joint assembly (4-4). The rotating shaft fixedly connected to the other end of the crank arm (4-7) passes through the base (4-6) and is connected to the 35KV operating insulator (4-9). The output shaft of the electric operating mechanism (9) rotates and outputs, and controls the rotation of the 35KV operating insulator (4-9) through the operating rod (8).

3. The high-voltage DC de-icing disconnect switch according to claim 2, characterized in that: The joint assembly (4-4) includes an upper joint (41), a lower joint (42), a pull plate (43), a support plate (44), and a joint welding assembly (45). The upper joint (41) and the lower joint (42) are U-shaped structures with open and interlocking joints. One end of the upper joint (41), the lower joint (42), and the support plate (44) are hinged together by a first hinge shaft (47). The top of the pull rod assembly (4-8) extends from the lower conductive tube (4-5) and connects with the joint welding assembly (45). 5) Connection: The joint welding device (45) is an L-shaped structure with the top bent outward; the vertical end of the joint welding device (45) is hinged to one end of the pull plate (43) through the fourth hinge shaft (49), and the horizontal end of the joint welding device (45) is hinged to the other end of the support plate (44) through the third hinge shaft (48); a second hinge shaft (46) is also provided on the upper joint (41), and the other end of the pull plate (43) is hinged to the upper joint (41) through the second hinge shaft (46).

4. The high-voltage DC de-icing disconnect switch according to claim 3, characterized in that: The tie rod assembly (4-8) includes a main tie rod (51) and a secondary tie rod (59); one end of the main tie rod (51) is hinged to the crank arm (4-7), and the other end of the main tie rod (51) is hinged to one end of the curved crank arm (52). The other end of the curved crank arm (52) and the rotating frame (4-3) are hinged together to the lug structure of the base (4-6) through the horizontal shaft (53); one end of the secondary tie rod (59) is hinged to the lug set in the middle of the base (4-6) through the pin shaft, and the other end of the secondary tie rod (59) is hinged to the extension tie rod (54). The extension tie rod (54) extends out of the lower conductive tube (4-5) and connects to the joint assembly (4-4).

5. The high-voltage DC de-icing disconnect switch according to claim 4, characterized in that: The extension rod (54) has a roller (55) at the bottom hinge, and the roller (55) rolls with the inner cavity of the rotating frame (4-3). A limiting plate (56) is provided on the extension rod (54), and a fixing sleeve (57) is provided in the middle inner cavity of the lower conductive tube (4-5). The balance spring (58) is coaxially engaged with the extension rod (54), and one end is supported on the fixing sleeve (57) and the other end is supported on the limiting plate (56).

6. The high-voltage DC de-icing disconnect switch according to claim 1, characterized in that: The stationary contact (1) includes a stationary contact seat (1-3), contact fingers (1-4), and a spring (1-5); a terminal block (1-2) is connected to the top of the equalizing ring (2) via a steel bracket (1-1). The end of the terminal block (1-2) extends outward and is connected to the stationary contact seat (1-3). Stationary contact pieces (1-8) are provided on both sides of the lower part of the stationary contact seat (1-3). Contact fingers (1-4) are provided on the inner side of the stationary contact pieces (1-8). The outer end of the contact fingers (1-4) is supported and positioned by the spring (1-5). The contact plate (4-1) is a blade-type structure and is inserted into the two contact fingers (1-4).

7. The high-voltage DC de-icing disconnect switch according to claim 6, characterized in that: The bottom fixing structure of the static contact seat (1-3) is connected to the guide plate (1-7), and the bottom of the guide plate (1-7) is a tapered opening.

8. The high-voltage DC de-icing disconnect switch according to claim 6, characterized in that: The bottom of the stationary contact base (1-3) is connected to a rain cover (1-6), which covers the stationary contact piece (1-8) and the contact finger (1-4).

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