Solid-sealed polar pole for phase control switch and working method of solid-sealed polar pole

Abstract

The invention discloses a solid-sealed polar pole for a phase control switch and a working method of the solid-sealed polar pole, and belongs to the technical field of power high-voltage switches. The pole comprises an insulating solid-sealed body; an upper outgoing line, a vacuum arc-extinguishing chamber, an insulating pull rod and a phase control mechanism which are connected in sequence are arranged in the insulating solid-sealed body from top to bottom; the outlet of the vacuum arc-extinguishing chamber is also connected with one end of a lower outgoing line through flexible connection; the other end of the lower outgoing line is connected to the contact arm end face of the switch; and a current transformer is sleeved outside the lower outgoing line. Enough space is reserved at the lower part of the pole for mounting a phase control mechanism, so that the size is small and the cost is low; the lower outgoing line is of a specially-designed special-shaped structure, and the sectional areas on the diversion paths are basically the same, so that the resistance of the pole is small.

Description

Technical Field

[0001] The invention belongs to the technical field of electric high-voltage switches and relates to a sealed pole for a phase-controlled switch and a working method thereof. Background Art

[0002] With the rapid development of modern power technology, the short-circuit current can be interrupted at the appropriate current phase, that is, phase-selective interruption. The core advantage of phase-selective interruption technology is that it can cleverly use the favorable moment in the current waveform to interrupt the circuit, thereby greatly reducing the generation of arcs. The reduction of arcs not only means that the damage suffered by the equipment during operation is minimized, but also significantly improves the electrical life of the equipment, which is crucial for the long-term stable operation of the power system. In addition, this technology can also effectively increase the current level of interruption, so that the volume of the vacuum interrupter can be reduced under the same performance requirements, thereby promoting the compactness and lightweight design of the entire power equipment. This pole with phase-selective interruption capability can detect the current in the circuit in real time and can be used in phase-controlled switches.

[0003] However, in actual operation, how to accurately and in real time measure the current size and phase in the line has become a technical difficulty that needs to be solved urgently. In the design of traditional phase-controlled switches, in order to achieve the measurement of current, a current transformer is usually installed on the outside of the pole, and the phase-controlled mechanism is also set on the outside of the pole. Although such a design meets the measurement needs to a certain extent, it inevitably leads to the volume of the entire device being much larger than that of a conventional pole, which not only causes inconvenience in space utilization, but also increases manufacturing costs, greatly reducing the economy of the entire phase-controlled switch system. Therefore, how to optimize the structural design of the phase-controlled switch, reduce its volume and reduce costs while ensuring measurement accuracy and real-time performance is a problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a sealed pole for a phase-controlled switch and a working method thereof, so as to solve the technical problem that the current transformer and the phase-controlled mechanism are both arranged outside the pole in the prior art, which results in large volume and high cost.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a sealed pole for a phase-controlled switch, comprising an insulating sealed body; the insulating sealed body is provided with an upper outlet line, a vacuum arc extinguishing chamber, an insulating pull rod and a phase-controlled mechanism connected in sequence from top to bottom; the outlet of the vacuum arc extinguishing chamber is also connected to one end of the lower outlet line through a flexible connection; the other end of the lower outlet line is connected to the contact arm end face of the switch; a current transformer is provided on the outer sleeve of the lower outlet line.

[0006] Furthermore, the current transformer is a circular ring structure; the outer wall of the current transformer is connected to a current transformer bracket; the current transformer bracket is fixed in the insulating solid sealing body, and the current transformer bracket fixes the position of the current transformer before casting the insulating solid sealing body.

[0007] Furthermore, the current transformer bracket can also be used to fix the current transformer lead, and the current transformer lead is connected to the current signal interface insert.

[0008] Furthermore, the lower outlet is a special-shaped lower outlet.

[0009] Furthermore, the special-shaped lower outlet includes a first section of the lower outlet, a second section of the lower outlet and a third section of the lower outlet connected in sequence; the first section of the lower outlet is connected to the soft connection, and the cross-section of the first section of the lower outlet is a rectangle; the second section of the lower outlet is a special-shaped structure that transitions between a rectangle and a circle; the cross-section of the third section of the lower outlet is a circle, and the third section of the lower outlet is connected to the end face of the contact arm of the switch.

[0010] Furthermore, the angle between the second section lower outlet line and the third section lower outlet line at the connection point is an obtuse angle.

[0011] Furthermore, the corners of the first section of the lower outlet line close to the second section of the lower outlet line are of a rounded structure; the corners of the second section of the lower outlet line close to the third section of the lower outlet line are of a rounded structure.

[0012] Furthermore, the insulating seal has a cavity; the insulating rod and the phase-controlled mechanism are both located in the cavity; the cavity is provided with a step at the connection between the insulating rod and the phase-controlled mechanism; a plurality of cavity inserts are circumferentially fixed on the step, and the cavity inserts are used to fix the phase-controlled mechanism.

[0013] In a second aspect, the present invention provides a method for operating the above-mentioned sealed pole for a phase-controlled switch, comprising the following steps: When in working state, the upper outgoing line, vacuum interrupter, flexible connection and lower outgoing line constitute the main circuit for passing rated current and short-circuit current; the current magnitude and phase flowing through the main circuit are detected in real time through the current transformer; the insulating pull rod and phase control mechanism can perform the opening operation at the required phase.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a sealed pole for a phase-controlled switch and a working method thereof, wherein an upper outlet, a vacuum arc extinguishing chamber, a flexible connection, and a special-shaped lower outlet constitute a main circuit for passing rated current and short-circuit current; a current transformer detects the magnitude and phase of the current flowing through the main circuit in real time, a current transformer bracket fixes the current transformer and leads, and the leads and current signal interface inserts transmit current signals. The lower cavity of the pole has sufficient space and inserts to fix the phase-controlled mechanism, and the lower outlet has sufficient insulation distance from the insulating pull rod and the phase-controlled mechanism. The present invention integrates the current transformer into the pole, and thanks to the special lower outlet design, sufficient space can be reserved to install the phase-controlled mechanism. When the phase-controlled switch realizes the phase-control function, it can be miniaturized, small in size and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of a sealed pole for a phase-controlled switch according to the present invention; Figure 2 Schematic diagram of the structure of a current transformer according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the lower outlet of an embodiment of the present invention.

[0017] Among them: 1-insulating seal; 2-vacuum arc extinguishing chamber; 3-lower outlet; 31-first section lower outlet; 32-second section lower outlet; 33-third section lower outlet; 4-current transformer; 5-current transformer bracket; 6-flexible connection; 7-insulating pull rod; 8-cavity inlay; 9-phase control mechanism; 10-current transformer lead; 11-current signal interface insert; 12-upper outlet. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1The embodiment of the present invention discloses a sealed pole for a phase-controlled switch, including an insulating sealed body 1; the insulating sealed body 1 is provided with an upper outlet 12, a vacuum arc chamber 2, an insulating pull rod 7 and a phase control mechanism 9 connected in sequence from top to bottom; the outlet of the vacuum arc chamber 2 is also connected to one end of the lower outlet 3 through a soft connection 6; the other end of the lower outlet 3 is connected to the end face of the contact arm of the switch; and a current transformer 4 is provided on the outer sleeve of the lower outlet 3. The embodiment of the present invention integrates the current transformer 4 in the pole, and outputs the current signal in real time. Sufficient space is reserved at the bottom of the pole for installing the phase control mechanism 9. The lower outlet 3 is a specially designed special-shaped structure, and the cross-sectional area on the guide path is basically the same, ensuring that the resistance of the pole is small.

[0025] In a possible embodiment of the present invention, see Figure 2 , the current transformer 4 is a circular ring structure; the outer wall of the current transformer 4 is connected to a current transformer bracket 5; the current transformer bracket 5 is fixed in the insulating solid seal 1, and the current transformer bracket 5 fixes the position of the current transformer 4 before casting the insulating solid seal 1. The current transformer bracket 5 can also be used to fix the current transformer lead 10, and the current transformer lead 10 is connected to the current signal interface insert 11. In this embodiment, the current transformer 4 is sleeved outside the lower outlet 3, and the current flowing through the pole can be detected in real time. The current transformer bracket 5 can fix the position of the current transformer 4 in the pole, and can fix the current transformer lead 10. The current transformer lead and the current signal interface insert 11 are used to transmit the current signal in real time.

[0026] In a possible embodiment of the present invention, see Figure 3 , the lower outlet 3 is a special-shaped lower outlet. It includes the first section of the lower outlet 31, the second section of the lower outlet 32 ​​and the third section of the lower outlet 33 connected in sequence; the first section of the lower outlet 31 is connected to the soft connection 6, and the cross section of the first section of the lower outlet 31 is a rectangular; the second section of the lower outlet 32 ​​is a special-shaped structure transitioning from a rectangle to a circle, and the angle between the second section of the lower outlet 32 ​​and the third section of the lower outlet 33 is an obtuse angle; the cross section of the third section of the lower outlet 33 is a circle, and the third section of the lower outlet 33 is connected to the contact arm end face of the switch. Preferably, the corners of the first section of the lower outlet 31 close to the second section of the lower outlet 32 ​​are rounded structures; the corners of the second section of the lower outlet 32 ​​close to the third section of the lower outlet 33 are rounded structures. The cross-sectional areas of each section on the guide path of the entire lower outlet 3 are basically the same, ensuring that there are no weak points on the guide path. This structure can ensure sufficient insulation distance from the insulating pull rod 7 and the current transformer 4 while ensuring the flow. Thanks to the special-shaped design of the lower outlet 3, sufficient space can be left at the bottom of the pole to install the phase control mechanism 9.

[0027] In a feasible embodiment of the present invention, the insulating sealing body 1 has a cavity therein; the insulating pull rod 7 and the phase-controlled mechanism 9 are both located in the cavity; the cavity is provided with a step at the connection between the insulating pull rod 7 and the phase-controlled mechanism 9; a plurality of cavity inserts 8 are circumferentially fixed on the step, and the cavity inserts 8 are used to fix the phase-controlled mechanism 9.

[0028] The embodiment of the present invention discloses a working method of the above-mentioned sealed pole for the phase-controlled switch, comprising the following steps: When in working state, the upper outgoing line 12, vacuum interrupter 2, flexible connection 6 and lower outgoing line 3 constitute a main circuit for passing rated current and short-circuit current; and the current magnitude and phase flowing through the main circuit are detected in real time through the current transformer 4; the insulating pull rod 7 and the phase control mechanism 9 can perform the opening operation at the required phase.

[0029] The current transformer 4 of this embodiment is mounted on the lower outlet 3, and can detect the current size and phase in the loop in real time. Through the phase control mechanism 9, it can be disconnected at any time in the current phase to achieve phase selection and disconnection. The current transformer bracket 5 is used to fix the current transformer 4 and the current signal line before pouring. Space and position are reserved at the bottom of the pole to install the cavity insert 8 and the phase control mechanism 9. The lower outlet 3 is a special-shaped design, and the cross-sectional areas of each on the guide path are basically the same, which can ensure the temperature rise performance of the product. At the same time, this structural arrangement can ensure that there is sufficient insulation thickness and distance between the lower outlet 3 and the metal body at the lower end of the insulating pull rod 7, thereby ensuring the insulation performance of the product.

[0030] The working process / working principle of the present invention is as follows: The present invention discloses a sealed pole for a phase-controlled switch, comprising an upper outlet 12 for current diversion and breaking, a vacuum interrupter 2, a flexible connection 6, and a special-shaped lower outlet; a current transformer 4 for real-time detection of system current, a current transformer bracket 5, a current transformer lead 10, and a current signal interface insert 11. An insulating pull rod 7, a phase control mechanism 9, and a cavity insert 8 are used to control the opening and closing of the pole.

[0031] During operation, the upper outlet 12, vacuum interrupter 2, flexible connection 6, and special-shaped lower outlet pass the rated current and short-circuit current, the current transformer 4 detects the magnitude and phase of the current flowing through the main circuit in real time, the current transformer bracket 5 fixes the current transformer 4 and the current transformer lead 10, and the lead and the current signal interface insert 11 transmit the current signal. The lower cavity of the pole has enough space and inserts to fix the phase control mechanism 9, and the lower outlet 3 has enough insulation distance from the insulating pull rod 7 and the phase control mechanism.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealed pole for a phase-controlled switch, characterized in that: The invention comprises an insulating solid-sealed body (1); an upper outlet (12), a vacuum arc extinguishing chamber (2), an insulating pull rod (7) and a phase control mechanism (9) are arranged in sequence from top to bottom in the insulating solid-sealed body (1); the outlet of the vacuum arc extinguishing chamber (2) is also connected to one end of a lower outlet (3) through a flexible connection (6); the other end of the lower outlet (3) is connected to the end face of a contact arm of a switch; and a current transformer (4) is arranged on the outer sleeve of the lower outlet (3).

2. The sealed pole for a phase-controlled switch according to claim 1, characterized in that: The current transformer (4) is of a circular ring structure; the outer wall of the current transformer (4) is connected to a current transformer bracket (5); the current transformer bracket (5) is fixed in the insulating sealing body (1), and the current transformer bracket (5) fixes the position of the current transformer (4) before casting the insulating sealing body (1).

3. The sealed pole for a phase-controlled switch according to claim 1, characterized in that: The current transformer bracket (5) can also be used to fix a current transformer lead (10), wherein the current transformer lead (10) is connected to a current signal interface insert (11).

4. The sealed pole for a phase-controlled switch according to claim 1, characterized in that: The lower outlet (3) is a special-shaped lower outlet.

5. The sealed pole for a phase-controlled switch according to claim 4, characterized in that: The special-shaped lower outlet wire comprises a first section of lower outlet wire (31), a second section of lower outlet wire (32) and a third section of lower outlet wire (33) which are connected in sequence; the first section of lower outlet wire (31) is connected to the flexible connection (6), and the cross section of the first section of lower outlet wire (31) is rectangular; the second section of lower outlet wire (32) is a special-shaped structure that is a transition between a rectangle and a circle; the cross section of the third section of lower outlet wire (33) is circular, and the third section of lower outlet wire (33) is connected to the end face of the contact arm of the switch.

6. The sealed pole for a phase-controlled switch according to claim 5, characterized in that: The angle between the second section lower outlet line (32) and the third section lower outlet line (33) at the connection point is an obtuse angle.

7. The sealed pole for a phase-controlled switch according to claim 5, characterized in that: The corners of the first section lower outlet line (31) close to the second section lower outlet line (32) are of a rounded structure; and the corners of the second section lower outlet line (32) close to the third section lower outlet line (33) are of a rounded structure.

8. The sealed pole for a phase-controlled switch according to claim 1, characterized in that: The insulating seal (1) has a cavity therein; the insulating pull rod (7) and the phase control mechanism (9) are both located in the cavity; the cavity is provided with a step at the connection between the insulating pull rod (7) and the phase control mechanism (9); a plurality of cavity inlays (8) are fixed circumferentially on the step, and the cavity inlays (8) are used to fix the phase control mechanism (9).

9. A method for operating the sealed pole for a phase-controlled switch according to any one of claims 1 to 8, characterized in that: The following steps are involved: In the working state, the upper outlet (12), the vacuum interrupter (2), the flexible connection (6) and the lower outlet (3) form a main circuit for passing the rated current and the short-circuit current; the magnitude and phase of the current flowing through the main circuit are detected in real time through the current transformer (4); the insulating pull rod (7) and the phase control mechanism (9) can perform a tripping operation at a desired phase.

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