CN105448576A - Disconnecting switch used for large current ice melting of high-voltage power transmission line - Google Patents

Abstract

An isolating switch for high-current melting of high-voltage transmission lines. Two static contacts and an on-off control device are installed on a base through insulator pillars. The on-off control device includes a conduction shaft and an insulating shaft. Two The static contacts are separately arranged on both sides of the insulating shaft, and each static contact is provided with a U-shaped groove, and the conduction shaft is installed on the insulating shaft, and the conduction shaft can be rotated so that both ends are inserted into or away from the two static contacts at the same time. The two ends of the guide shaft are equipped with a telescopic contact finger and two fixed contact fingers. The telescopic contact fingers can be separated by sliding or closely contact the bottom surface of the U-shaped groove. The two fixed contacts can be moved along with the guide shaft. The two sides of the U-shaped groove are rotated away from or closely contacted, and a first drive assembly for driving the conduction shaft to rotate around the insulated shaft, a second drive assembly for driving the conduction shaft to rotate around the axis of the conduction shaft itself, and A third drive assembly for driving the telescopic movement of the telescopic fingers. It has reasonable structural design, good heat dissipation effect, strong flow capacity, and high safety and reliability.

Description

Isolating switch for high current melting ice of high voltage transmission line

technical field

The invention relates to the technical field of electrical engineering equipment, in particular to an isolating switch for high-current high-current melting ice of a high-voltage transmission line.

Background technique

my country is one of the countries that are seriously affected by icing disasters in the world. Icing will cause major accidents such as transmission line collapse and insulator flashover. UHV lines are used as backbone grids. Large-scale power outages are caused, which bring serious losses to power grid enterprises and the national economy. Taking 2008 as an example, the ice disaster caused large-scale collapse of towers and disconnection, causing losses to power grid companies as high as tens of billions. At present, the most effective measure to prevent and control ice disasters in the power system is to melt the ice, through the thermal effect of the current, to achieve the purpose of melting the ice. The ice-melting current is generally realized through the line on the isolating switch. The current level of the current isolating switch is about 6300A, which can meet the ice-melting of the 500kV and below lines. The UHV lines generally use eight-split conductors, and the ice-melting current is generally in the Above 10000A, the current flow level of the existing isolating switch cannot meet the melting ice of large cross-section conductors. The flow capacity of the isolating switch is mainly reflected in the contact part of the isolating switch. The existing isolating switch contact structure is generally a single horizontal crimping structure. The contact pressure between the contact and the contact finger is not large, and the contact resistance is high. There will be overheating when the current is high, and in severe cases, it will cause ablation of the isolating switch and fail to melt ice. With the rapid development of UHV lines, many UHV lines pass through severely ice-covered areas, and it is imperative to melt ice on UHV lines. Therefore, it is urgent to develop a special isolation switch for high-current ice-melting.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, and provide a disconnector for high-current high-current melting ice of high-voltage transmission lines with reasonable structural design, good heat dissipation effect, strong flow capacity, and high safety and reliability.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

An isolating switch for high-current melting ice of high-voltage transmission lines, including two static contacts respectively connected to the output end of the ice melting device and the line to be ice-melted, and an on-off switch for connecting or disconnecting the two static contacts The control device, the two static contacts and the on-off control device are respectively installed on a base through the insulator support, the on-off control device includes a conduction shaft and an insulating rotating shaft rotatably arranged on the insulator support, and the two static contacts The contacts are arranged on both sides of the insulating shaft, and each static contact is provided with a U-shaped groove. The conduction shaft is installed on the insulating shaft, and the conduction shaft can rotate around its own axis so that the two ends are inserted into or away from the two ends at the same time. A U-shaped groove of a static contact. Both ends of the conduction shaft are provided with a telescopic contact finger and two fixed contact fingers. The telescopic contact fingers are slid along the axial direction of the conduction shaft and can be separated or separated by sliding. In close contact with the bottom surface of the U-shaped groove, the two fixed contacts are symmetrically fixed on the conduction shaft relative to the conduction shaft and are separated from or closely contacted with the two sides of the U-shaped groove with the rotation of the conduction shaft. The on-off control The device also includes a first drive assembly for driving the conduction shaft to rotate around the insulated shaft, a second drive assembly for driving the conduction shaft to rotate around the axis of the conduction shaft itself, and a third drive for driving the retractable movement of the telescopic fingers components.

In the above isolating switch, preferably, the axis of the insulating shaft is arranged vertically, the axis of the conduction shaft is arranged horizontally, and the two sides of the U-shaped groove are two horizontal planes arranged at intervals.

In the above isolating switch, preferably, the maximum distance between the surfaces of the two fixed contact fingers in the radial direction of the conduction axis is greater than the distance between the two sides of the U-shaped groove.

For the above isolating switch, preferably, the first driving assembly includes a first driving hand wheel, a first driving shaft installed on the insulator support and a first bevel gear fixed on the insulating rotating shaft, and the first driving hand The wheel is affixed to one end of the first drive shaft, and the other end of the first drive shaft is affixed to a second bevel gear that cooperates with the first bevel gear for transmission.

In the above disconnector, preferably, the second drive assembly includes a second drive handwheel, a second drive shaft mounted on the insulator support, a first spur gear mounted on the insulator support, and a drive shaft fixed on the The second spur gear is connected with the second driving handwheel through the second drive shaft, and the second spur gear is connected with the first spur gear through the linkage rack provided by sliding.

For the above isolating switch, preferably, the third drive assembly includes a third handwheel, a telescopic drive gear mounted on the conduction shaft, and two telescopic racks that slide axially along the conduction shaft, and the two telescopic teeth The bars are arranged on both sides of the telescopic drive gear and meshed with the telescopic drive gear. The telescopic fingers at both ends of the guide shaft are respectively connected to the two telescopic racks. The third hand wheel is connected to the telescopic drive through the third drive shaft. The gears are connected.

Compared with the prior art, the advantage of the present invention is that: the isolating switch used in the present invention for high-voltage transmission line high-current melting ice adopts the method that the telescopic contact fingers and the two fixed contact fingers are in close contact with the U-shaped groove of the static contact. Turning on the ice-melting current increases the contact area and crimping force between the moving contact (each contact finger) and the static contact, greatly improving the current flow capacity of the isolating switch, and can safely and stably conduct the ice-melting current , to avoid contact ablation due to excessive current, especially for the ultra-high current during ice melting of UHV lines, which can ensure reliable and stable ice melting process; and when the conduction shaft is separated from the static contact, the insulation distance Large, it can well realize the insulation between the ice-melting device and the live line, and has high safety. The isolating switch has a reasonable structural design, good heat dissipation effect, no overheating phenomenon when a large current is passed through, and the operation is simple and labor-saving, and the circuit connection is convenient. The simulation test proves that the isolating switch has good heat dissipation effect, stable operation, safety and reliability, and fully meets the design requirements.

Description of drawings

Figure 1 is a schematic diagram of the structure of an isolating switch.

Fig. 2 is a structural schematic view of the first bevel gear fixed on the insulating rotating shaft in the first drive assembly.

Fig. 3 is a structural schematic diagram of the connection between the second spur gear and the first spur gear through a linkage rack in the second drive assembly.

Fig. 4 is a structural schematic diagram of cooperation between the telescopic drive gear and the two telescopic racks in the third drive assembly.

Fig. 5 is a schematic diagram when the telescopic contact fingers are separated from the bottom surface of the U-shaped groove and the two fixed contact fingers are separated from the two sides of the U-shaped groove.

Fig. 6 is a schematic diagram when the telescopic contact fingers are detached from the bottom surface of the U-shaped groove and the two fixed contact fingers are in close contact with the two sides of the U-shaped groove.

Fig. 7 is a schematic diagram when the telescopic contact fingers are in close contact with the bottom surface of the U-shaped groove and the two fixed contact fingers are in close contact with the two sides of the U-shaped groove.

illustration:

1. Static contact; 11. U-shaped groove; 2. On-off control device; 21. Conducting shaft; 22. Insulated shaft; 23. Telescopic contact finger; 24. Fixed contact finger; 25. First bevel gear; 26 , the first spur gear; 27, the second spur gear; 28, the telescopic drive gear; 29, the telescopic rack; 210, the linkage rack; 3, the insulator pillar; 4, the base.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the isolating switch of the present invention for high-current melting ice of high-voltage transmission lines includes two static contacts 1 respectively connected to the output end of the ice-melting device and the line to be ice-melted and used to connect or disconnect the two static contacts 1. The on-off control device 2 of a static contact 1, the two static contacts 1 and the on-off control device 2 are respectively installed on a base 4 through the insulator support 3, and the on-off control device 2 includes a conduction shaft 21 and a rotating device. On the insulating rotating shaft 22 on the insulator support 3, two static contacts 1 are arranged on both sides of the insulating rotating shaft 22, and each static contact 1 is provided with a U-shaped groove 11, and the conduction shaft 21 is installed on the insulating rotating shaft 22, and the guide The through shaft 21 can rotate around its own axis so that the two ends of the conduction shaft 21 are respectively embedded in or away from the U-shaped grooves 11 of the two static contacts 1 at the same time. Both ends of the conduction shaft 21 are provided with a telescopic contact finger 23 and Two fixed contact fingers 24, the telescopic contact fingers 23 are axially slid along the conduction shaft 21 and can slide away from or closely contact the bottom surface of the U-shaped groove 11, and the two fixed contact fingers 24 are fixed symmetrically with respect to the conduction shaft 21. Connected to the conduction shaft 21 and with the rotation of the conduction shaft 21, disengages or closely contacts the two sides of the U-shaped groove 11. The on-off control device 2 also includes a first drive for driving the conduction shaft 21 to rotate around the insulating rotating shaft 22. assembly, a second drive assembly for driving the guide shaft 21 to rotate around the axis of the guide shaft 21 itself, and a third drive assembly for driving the telescopic movement of the telescopic contact fingers 23 .

Drive the conducting shaft 21 to rotate around the insulated rotating shaft 22 through the first drive assembly, so that the two ends of the conducting shaft 21 can be inserted into or away from the U-shaped grooves 11 of the two static contacts 1 at the same time, when the two ends of the conducting shaft 21 When the ends are inserted into the U-shaped grooves 11 of the two static contacts 1 at the same time (see Figure 5), the conduction shaft 21 is driven to rotate around the axis of the conduction shaft 21 itself through the second drive assembly, so that the two fixed contacts 24 follow the guide The rotation of the through shaft 21 is in close contact with the two sides of the U-shaped groove 11 (see Figure 6), and at the same time, the telescopic contact finger 23 is driven to extend through the third drive assembly to make close contact with the bottom surface of the U-shaped groove 11 (see Figure 7). That is, the ice-melting device and the circuit to be melted are connected to realize high-current ice-melting; after the ice-melting is completed, the second drive assembly is used to drive the conduction shaft 21 to rotate around the axis of the conduction shaft 21 itself, so that the two fixed contacts 24 With the rotation of the conduction shaft 21, the two sides of the U-shaped groove 11 are separated, and at the same time, the telescopic contact finger 23 is driven to retract from the bottom surface of the U-shaped groove 11 through the third drive assembly, and then the conduction shaft 21 is driven to rotate around the U-shaped groove 11 through the first drive assembly. The insulation rotating shaft 22 rotates away from the U-shaped groove 11 of the two static contacts 1 at the same time, so that the separation of the conduction shaft 21 and each static contact 1 can be realized, and the insulation distance meets the requirements, and the conduction shaft 21 is far away from the two static contacts. The best position of the contact 1 is that the axis of the conduction shaft 21 is perpendicular to the line between the two static contacts 1 , and in this state the distance between the conduction shaft 21 and the two stationary contacts 1 is the farthest.

The isolating switch conducts the ice-melting current in the way that the telescopic contact fingers 23 and two fixed contact fingers 24 are in close contact with the U-shaped groove 11 of the static contact 1, which increases the distance between the movable contact (each contact finger) and the static contact. The contact area and crimping strength of head 1 greatly improve the current flow capacity of the isolating switch, which can safely and stably conduct the current during ice melting, and avoid contact ablation due to excessive current, especially for UHV lines The extra large current during ice melting can ensure the reliable and stable ice melting process; moreover, when the conduction shaft 21 is separated from the static contact 1, the insulation distance is large, which can well realize the insulation between the ice melting device and the live line. High security. The isolating switch has a reasonable structural design, good heat dissipation effect, no overheating phenomenon when a large current is passed through, and the operation is simple and labor-saving, and the circuit connection is convenient. The simulation test proves that the isolating switch has good heat dissipation effect, stable operation, safety and reliability, and fully meets the design requirements.

Preferably, the axis of the insulating shaft 22 is arranged vertically, the axis of the conduction shaft 21 is arranged horizontally, and the two sides of the U-shaped groove 11 are two horizontal planes arranged at intervals. The conduction shaft 21 is installed on the insulating rotating shaft 22 and can rotate around its own axis. It can be installed in the following way: a mounting block is fixed on the insulating rotating shaft 22. The mounting block is provided with a rotation matching through hole. In the matching through hole, a limiting member is respectively provided at both ends of the rotating fitting through hole to limit the axial movement of the guide shaft 21 .

Preferably, the maximum distance between the surfaces of the two fixed contact fingers 24 in the radial direction of the conduction shaft 21 is greater than the distance between the two sides of the U-shaped groove 11, so that the two fixed contact fingers 24 follow the conduction shaft 21 Rotation is in contact with the two sides of the U-shaped groove 11, which can form a certain expansion effect and realize tight crimping.

In this embodiment, the first driving assembly includes a first driving handwheel, a first driving shaft installed on the insulator support 3 and a first bevel gear 25 fixed on the insulating rotating shaft 22, and the first driving handwheel is fixed on One end of the first drive shaft, and the other end of the first drive shaft are fixedly connected with a second bevel gear that cooperates with the first bevel gear 25 for transmission. The structure of the first bevel gear 25 fixedly connected to the insulating rotating shaft 22 is shown in FIG. 2 . Turning the first driving hand wheel drives the second bevel gear to rotate, and the second bevel gear drives the first bevel gear 25 to rotate, and then drives the insulating rotating shaft 22 to rotate with the conduction shaft 21 installed thereon, so that the conduction shaft 21 Rotate around the insulating shaft 22 to fit into or move away from the U-shaped groove 11 .

In this embodiment, the second drive assembly includes a second drive handwheel, a second drive shaft mounted on the insulator support 3, a first spur gear 26 mounted on the insulator support 3 and a drive shaft fixed on the conduction shaft 21. The second spur gear 27 , the first spur gear 26 is connected with the second driving handwheel through the second drive shaft, and the second spur gear 27 is connected with the first spur gear 26 through the linkage rack 210 which is slidably arranged (see FIG. 3 ). Turning the second driving hand wheel drives the first spur gear 26 to rotate, and the first spur gear 26 drives the second spur gear 27 to rotate through the linkage rack 210, and then drives the conduction shaft 21 to rotate around its own axis, so that the two fixed contact fingers can be rotated. 24 break away from or closely contact the two sides of U-shaped groove 11.

In this embodiment, the third drive assembly includes a third handwheel, a telescopic drive gear 28 mounted on the guide shaft 21, and two telescopic racks 29 slidingly arranged axially along the guide shaft 21. The two telescopic racks 29 are located on both sides of the telescopic drive gear 28 and meshed with the telescopic drive gear 28 (see Figure 4). The telescopic contact fingers 23 at both ends of the guide shaft 21 are respectively connected to the two telescopic racks 29. The third handwheel passes through the first Three drive shafts link to each other with telescoping drive gear 28 . Rotate the third driving hand wheel to drive the telescopic drive gear 28 to rotate, and the telescopic drive gear 28 correspondingly drives the two telescopic racks 29 to reciprocate along the axial direction of the conduction shaft 21, and then drives the telescopic contact fingers 23 to reciprocate and slide to achieve separation or tightness. Contact the bottom surface of the U-shaped groove 11.

In other embodiments, the first drive assembly, the second drive assembly, and the third drive assembly can also adopt other existing technologies, and the first drive assembly, the second drive assembly, and the third drive assembly can also be integrated into one hand Wheel control, in order to increase the compactness of the structure, reduce the cost, and improve the convenience of operation, the conversion mechanism is used to respectively drive the rotation of the conduction shaft 21, the rotation of the conduction shaft 21 around its own axis, and the reciprocating sliding of the telescopic finger 23. The conversion mechanism also Existing technologies can be adopted, for example, reference can be made to the reversing and transmission devices used in existing automobiles or agricultural machinery.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above examples. For those skilled in the art, improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims (6)

1. An isolating switch for high-current melting ice on high-voltage transmission lines, including two static contacts (1) connected to the output end of the ice-melting device and the line to be ice-melted, and two static contacts (1) for connecting or disconnecting the two static contacts. The on-off control device (2) of the contact (1) is characterized in that: the two static contacts (1) and the on-off control device (2) are respectively installed on a base (4) through insulator pillars (3) ), the on-off control device (2) includes a conduction shaft (21) and an insulating shaft (22) that is rotated on the insulator support (3), and two static contacts (1) are separately arranged on the insulating shaft (22 ), each static contact (1) is provided with a U-shaped groove (11), the conduction shaft (21) is installed on the insulating shaft (22), and the conduction shaft (21) can rotate around its own axis The two ends are embedded in or away from the U-shaped grooves (11) of the two static contacts (1) at the same time, and the two ends of the conduction shaft (21) are provided with a telescopic contact finger (23) and two fixed The contact finger (24), the telescopic contact finger (23) is axially slid along the conduction shaft (21) and can be separated from or closely contacted with the bottom surface of the U-shaped groove (11) by sliding, and the two fixed contact fingers (24) It is fixed on the conduction shaft (21) symmetrically with respect to the conduction shaft (21) and disengages or closely contacts the two sides of the U-shaped groove (11) with the rotation of the conduction shaft (21). The on-off control device (2) It also includes a first drive assembly for driving the conduction shaft (21) to rotate around the insulated shaft (22), a second drive assembly for driving the conduction shaft (21) to rotate around the axis of the conduction shaft (21) itself component and a third drive component for driving the telescopic movement of the telescopic contact finger (23). 2. The isolating switch according to claim 1, characterized in that: the axis of the insulating shaft (22) is arranged vertically, the axis of the conduction shaft (21) is arranged horizontally, and the U-shaped groove (11) The two side surfaces are two horizontal and spaced horizontal planes. 3. The isolating switch according to claim 1, characterized in that: the maximum distance between the surfaces of the two fixed contact fingers (24) in the radial direction of the conduction axis (21) is greater than that of the two U-shaped grooves (11). distance between the sides. 4. The isolating switch according to claim 1, 2 or 3, characterized in that: the first driving assembly includes a first driving hand wheel, a first driving shaft installed on the insulator support (3) and fixed on The first bevel gear (25) on the insulated rotating shaft (22), the first driving handwheel is affixed to one end of the first drive shaft, and the other end of the first drive shaft is affixed to the first bevel gear ( 25) Cooperate with the second bevel gear for transmission. 5. The isolating switch according to claim 1, 2 or 3, characterized in that: the second drive assembly includes a second drive handwheel, a second drive shaft mounted on the insulator support (3), a second drive shaft mounted on the insulator The first spur gear (26) on the pillar (3) and the second spur gear (27) fixed on the guide shaft (21), the first spur gear (26) communicates with the second drive shaft through the second The driving hand wheel is connected, and the second spur gear (27) is connected with the first spur gear (26) through a sliding linkage rack (210). 6. The isolating switch according to claim 1, 2 or 3, characterized in that: the third drive assembly includes a third hand wheel, a telescopic drive gear (28) mounted on the guide shaft (21) and two The first telescopic rack (29) slides axially along the conduction shaft (21), and the two telescopic racks (29) are respectively arranged on both sides of the telescopic drive gear (28) and meshed with the telescopic drive gear (28). The telescopic contact fingers (23) at both ends of the conduction shaft (21) are respectively connected to two telescopic racks (29), and the third hand wheel is connected to the telescopic drive gear (28) through a third drive shaft.