A high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism

Abstract

The present invention discloses a high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism. The high-voltage circuit breaker includes an arc extinguishing unit, a transmission system, and a drive device. The arc extinguishing unit includes a three-phase porcelain sleeve, and the three-phase porcelain sleeves all include an upper porcelain sleeve, a lower porcelain sleeve, a static contact, and a moving contact. The upper porcelain sleeve and the lower porcelain sleeve constitute an insulating chamber for disconnecting and insulating the static contact and the moving contact. The drive device includes a power module, a motor, and a connecting device. The power module provides power to the motor, and the motor drives the connecting device and drives the rotor of the transmission system. The transmission system includes a rotor, an output pull rod, multiple connecting rods, and an insulating pull rod. The output pull rod is driven by the rotation of the rotor, and the output pull rod drives multiple connecting rods of the transmission system. The multiple connecting rods are horizontally displaced to drive multiple insulating pull rods, and the vertical mechanical linkage of the moving contacts of the A-phase porcelain sleeve, the B-phase porcelain sleeve, and the C-phase porcelain sleeve is driven to achieve opening or closing.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage circuit breakers, and more particularly to a high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism. Background Art

[0002] High-voltage circuit breakers are crucial protection and control devices in power systems. The operating mechanism is a crucial component of the circuit breaker, and its kinematic performance directly impacts the current-interrupting capability of the arc-extinguishing unit. Traditional operating mechanisms utilize springs, hydraulics, or pneumatics, primarily consisting of a connecting rod, a latch, and an energy supply system. These mechanisms, however, have numerous components, complex mechanical structures, large cumulative motion tolerances, and limitations in regulating and controlling the operating process. Currently, new motor-operated mechanisms that utilize capacitors instead of springs or compressed air to store the energy required to control the operating mechanism are emerging as a new development direction for high-voltage circuit breakers.

[0003] The operating mechanism of the existing high-voltage circuit breaker mostly adopts spring, hydraulic or pneumatic mechanism, etc. The existing operating mechanism has too many parts, the output torque of the driving machine is too long, and the arrangement is complicated.

[0004] Therefore, a technology is needed to implement a high-voltage circuit breaker for synchronous triggering. Summary of the Invention

[0005] The present invention provides a high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism to solve the problem of how to synchronously trigger the high-voltage circuit breaker.

[0006] In order to solve the above problems, the present invention provides a high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism, the high-voltage circuit breaker including an arc extinguishing unit, a transmission system and a drive device, characterized in that:

[0007] The arc extinguishing unit includes a phase A porcelain sleeve, a phase B porcelain sleeve, and a phase C porcelain sleeve. The phase A porcelain sleeve, the phase B porcelain sleeve, and the phase C porcelain sleeve all include an upper porcelain sleeve, a lower porcelain sleeve, a static contact, and a moving contact. The upper porcelain sleeve and the lower porcelain sleeve constitute an insulating chamber for breaking and insulating the static contact and the moving contact.

[0008] The driving device includes a power module, a motor and a connecting device, wherein the power module provides power to the motor, and the motor drives the connecting device and drives the rotating wheel of the transmission system;

[0009] The transmission system includes a rotor, an output pull rod, multiple connecting rods, and an insulating pull rod. The output pull rod is driven by the rotation of the rotor, and the output pull rod drives the multiple connecting rods of the transmission system to achieve horizontal displacement of the multiple connecting rods. The multiple insulating pull rods are driven by the horizontal displacement of the multiple connecting rods to drive the vertical mechanical linkage of the moving contacts of the A-phase porcelain sleeve, the B-phase porcelain sleeve, and the C-phase porcelain sleeve to achieve opening or closing of the circuit breaker.

[0010] Preferably, the relationship between the angle of rotation of the driving wheel by the driving unit and the displacement of the moving contact is:

[0011] x represents the displacement of the moving contact, H represents the stroke of the moving contact, and δ is the rotation angle of the motor output shaft.

[0012] Preferably, the transmission system includes an A-phase outer crank arm, a B-phase outer crank arm, a C-phase outer crank arm, an A-phase transmission shaft, a B-phase transmission shaft, a C-phase transmission shaft, an A-phase inner crank arm, a B-phase inner crank arm, a C-phase inner crank arm, a first inter-phase connecting rod, a second inter-phase connecting rod, a third inter-phase connecting rod, a fourth inter-phase connecting rod, and a rotating wheel.

[0013] Preferably, the A-phase outer crank arm is connected to the first end of the first inter-phase connecting rod and the first end of the second inter-phase connecting rod;

[0014] The B-phase outer crank arm is connected to the second end of the first inter-phase connecting rod, the second end of the second inter-phase connecting rod, the first end of the third inter-phase connecting rod, and the first end of the fourth inter-phase connecting rod;

[0015] The C-phase outer crank arm is connected to the second end of the third inter-phase connecting rod and the second end of the fourth inter-phase connecting rod.

[0016] Preferably, the first ends of the A-phase outer crank arm and the A-phase inner crank arm are connected to the A-phase transmission shaft;

[0017] The B-phase outer crank arm, the first end of the B-phase inner crank arm, and the output pull rod are connected to the B-phase transmission shaft;

[0018] The first ends of the C-phase outer crank arm and the C-phase inner crank arm are connected to the C-phase transmission shaft.

[0019] Preferably, the second end of the A-phase inner crank arm is connected to the A-phase insulating pull rod;

[0020] The second end of the B-phase inner crank arm is connected to the B-phase insulating pull rod;

[0021] The second end of the C-phase inner crank arm is connected to the C-phase insulating pull rod;

[0022] Preferably, the driving device is arranged in a middle position just below the transmission system.

[0023] Preferably, the rotation angle of the wheel during the closing process does not exceed 100 degrees, and the rotation angle of the wheel during the opening process does not exceed 90 degrees.

[0024] Preferably, the motor is a permanent magnet synchronous motor.

[0025] By combining the excellent control characteristics of the servo drive motor with advanced control algorithms through a digital control unit, efficient dynamic control of the circuit breaker's motion process is achieved. The high-voltage circuit breaker provided in this application, combined with the mechanical characteristics of a sulfur hexafluoride circuit breaker, proposes an operating mechanism that uses a three-phase permanent magnet synchronous motor to directly drive the circuit breaker. This mechanism controls the movement of the moving contacts according to an ideal opening and closing curve, which not only matches the circuit breaker's load reaction force with the mechanism's output but also improves the circuit breaker's opening and closing capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0027] Figure 1 A structural diagram of a high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of transmission of a high-voltage circuit breaker in closed and open states equipped with a permanent magnet synchronous motor operating mechanism according to an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of a simulated structure of a high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the driving motor structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0032] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0033] Figure 1 The figure is a structural diagram of a high voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism according to an embodiment of the present invention. Figure 1 As shown, it mainly consists of an arc extinguishing unit, a drive device and a transmission system. This application adopts a connection scheme to convert the rotation of the motor into a linear movement of the moving contact through a transmission mechanism, thereby driving the circuit breaker to complete the opening / closing operation. Figure 1 As shown, a high-voltage circuit breaker 100 equipped with a permanent magnet synchronous motor operating mechanism includes an arc extinguishing unit, a transmission system and a drive device, and is characterized in that:

[0034] The arc extinguishing unit includes a phase A porcelain sleeve, a phase B porcelain sleeve and a phase C porcelain sleeve. The phase A porcelain sleeve, the phase B porcelain sleeve and the phase C porcelain sleeve all include an upper porcelain sleeve, a lower porcelain sleeve, a static contact 1 and a moving contact 2. The upper porcelain sleeve and the lower porcelain sleeve constitute an insulating chamber, which is used to disconnect and insulate the static contact 1 and the moving contact 2.

[0035] In this application, the arc extinguishing unit includes a three-phase insulating porcelain sleeve, which is divided into an upper porcelain sleeve and a lower porcelain sleeve. The lower porcelain sleeve is connected to the inner crank arm of the transmission system. The inner crank arm is driven by the horizontal displacement of the horizontal interphase connecting rod of the transmission system, thereby realizing three-phase mechanical linkage. The adoption of this connection scheme can reduce the requirements for the torque of the transmission main shaft and improve the synchronization of the three-phase switch triggering.

[0036] The driving device includes a power module, a motor and a connecting device. The power module provides power to the motor. The motor drives the connecting device and drives the wheel 7 of the transmission system. The output rod 8 is driven by the rotating wheel 7. The output rod 8 drives multiple connecting rods 61, 62, 63, and 64 of the transmission system to achieve horizontal displacement of multiple connecting rods 61, 62, 63, and 64.

[0037] The transmission system includes a rotor, an output pull rod, an insulating pull rod, and multiple connecting rods 61, 62, 63, and 64. The output pull rod is driven by the rotation of the rotor, and the output pull rod drives multiple connecting rods of the transmission system to achieve horizontal displacement of multiple connecting rods. The multiple connecting rods 61, 62, 63, and 64 are used to horizontally displace and drive multiple insulating pull rods, such as the insulating pull rod 3 of the A-phase porcelain sleeve (the insulating pull rod of the B-phase porcelain sleeve and the insulating pull rod of the C-phase porcelain sleeve are the parts corresponding to the insulating pull rod 3 of the A-phase porcelain sleeve. Figure 1(not shown), drives the moving contacts of the A-phase porcelain sleeve, the B-phase porcelain sleeve and the C-phase porcelain sleeve, such as the moving contact 2 of the A-phase porcelain sleeve (the moving contact of the B-phase porcelain sleeve and the moving contact of the C-phase porcelain sleeve are the parts corresponding to the moving contact 2 of the A-phase porcelain sleeve, Figure 1 The vertical mechanical linkage (not shown) is used to realize opening or closing of the circuit breaker.

[0038] The transmission system is a crank-slider structure, primarily comprising multiple connecting rods, a transmission box, multiple inner and outer crank arms, an output pull rod, and a runner. The transmission mechanism is connected to the insulating pull rods of the circuit breaker body via the horizontal interphase connecting rods of the transmission box. The transmission system is connected to the drive unit rotor via the runner 7.

[0039] Preferably, the relationship between the angle of rotation of the driving wheel 7 by the driving unit and the displacement of the moving contact 2 is:

[0040] x represents the displacement of the moving contact 2, H represents the stroke of the moving contact, and δ is the rotation angle of the motor output shaft.

[0041] Preferably, the transmission system includes an A-phase outer crank arm 4, a B-phase outer crank arm, a C-phase outer crank arm, an A-phase transmission shaft 10, a B-phase transmission shaft, a C-phase transmission shaft, an A-phase inner crank arm, a B-phase inner crank arm, a C-phase inner crank arm 9, a first inter-phase connecting rod 61, a second inter-phase connecting rod 62, a third inter-phase connecting rod 63, a fourth inter-phase connecting rod 64, and a wheel 7.

[0042] Preferably, the A-phase outer crank arm 4 is connected to the first end of the first inter-phase connecting rod and the first end of the second inter-phase connecting rod;

[0043] The outer crank arm of phase B is connected to the second end of the first inter-phase connecting rod, the second end of the second inter-phase connecting rod, the first end of the third inter-phase connecting rod, and the first end of the fourth inter-phase connecting rod;

[0044] The C-phase outer crank arm is connected to the second end of the third inter-phase connecting rod and the second end of the fourth inter-phase connecting rod.

[0045] Preferably, the first ends of the A-phase outer crank arm and the A-phase inner crank arm are connected to the A-phase transmission shaft;

[0046] The B-phase outer crank arm, the first end of the B-phase inner crank arm, and the output pull rod are connected to the B-phase transmission shaft;

[0047] The first ends of the C-phase outer crank arm and the C-phase inner crank arm are connected to the C-phase transmission shaft.

[0048] Preferably, the second end of the inner crank arm of phase A is connected to the insulating pull rod of phase A;

[0049] The second end of the inner crank arm of phase B is connected to the insulating pull rod of phase B;

[0050] The second end of the inner crank arm of phase C is connected to the insulating pull rod of phase C;

[0051] Preferably, the driving device is arranged in a middle position just below the transmission system.

[0052] Preferably, the rotation angle of the rotor during closing is no more than 100°, and the rotation angle of the rotor during opening is no more than 90°.

[0053] Preferably, the drive motor is a permanent magnet synchronous motor.

[0054] Figure 2 The figure below is a transmission diagram of the high voltage circuit breaker in the closed and open states. Figure 2 As shown in the figure, x represents the displacement of the moving contact. When the circuit breaker is closed, starting from the opening position, the wheel rotates counterclockwise under the drive of the motor, and drives the insulating rod to move in the vertical direction through the output pull rod and the inner crank arm, driving the moving contact of the lower porcelain sleeve to move to the closing position. When in the closing position, the motor driving force and the dead point (E') of the transmission mechanism are used to suppress the closing rebound, so that the circuit breaker is finally kept in the closed state. For the opening operation of the circuit breaker, the movement process of the operating mechanism is opposite to that of the closing operation. The angle between the mechanisms during the closing process is as follows Figure 2 As shown in the closing process, through geometric analysis, the approximate relationship between the motor angle and the contact displacement can be obtained as shown in Equation 2, where OE is the wheel radius; ED represents the output pull rod, CB represents the inner crank arm, and AB is the insulating pull rod.

[0055]

[0056] x represents the displacement of the moving contact 2, H represents the stroke of the moving contact, and δ is the rotation angle of the motor output shaft.

[0057] In order to verify the technical effect of the embodiment of the present application, a spring operating mechanism of an LW30-126 outdoor self-energized SF6 circuit breaker is simplified, and a motor operating mechanism simulator is designed. Figure 3 As shown in the figure, the moving contact travel during operation is H = 150 mm, the rotation angle in the closed position is set to 100°, and the rotation angle in the open position is set to -90°. The motor rotation angle during the entire operation is 190°. Therefore, the crank slider structure can reduce the output torque requirement. At the same time, maximizing the range of motor rotation angle can also reduce the motor torque requirement.

[0058] In this application, the driving motor of the driving device is located in the middle position below the transmission system, and its output shaft is connected to the moving contact through a transmission mechanism. The selection of the motor should be combined with the load characteristics during the operation of the circuit breaker to ensure that the output characteristics of the motor and the reaction characteristics of the circuit breaker are well matched. The driving motor model used in this implementation scheme is: phase-1340A 4-pole permanent magnet synchronous motor, its overall dimensions are as follows: Figure 4 shown.

[0059] In this application, the motor serves as the sole driving component in the operating mechanism, significantly reducing the number of components in traditional operating mechanisms and improving their reliability. Furthermore, the three-link horizontal transmission connection scheme reduces the output torque requirements of the rotating components, improving the synchronization of the three-phase switch, and further reducing the motor torque requirements.

[0060] In principle, the movement of the moving contact of the trigger mechanism is only related to the motor rotation angle. Controlling the motor rotation angle displacement is equivalent to controlling the moving contact stroke curve, thereby achieving controllable opening and closing actions of the circuit breaker.

[0061] The present application proposes a trigger mechanism that uses a three-phase permanent magnet synchronous motor to directly drive a circuit breaker, controlling the movement of the contacts according to an ideal opening and closing curve. This can not only achieve a match between the load reaction force of the circuit breaker and the output of the mechanism, but also improve the opening and closing capabilities of the circuit breaker.

[0062] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0063] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / the [means, component, etc.]" are to be interpreted openly as referring to at least one instance of the means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily need to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A high-voltage circuit breaker equipped with a permanent magnet synchronous motor operating mechanism, comprising an arc extinguishing unit, a transmission system and a drive device, characterized in that : The arc extinguishing unit includes a phase A porcelain sleeve, a phase B porcelain sleeve, and a phase C porcelain sleeve. The phase A porcelain sleeve, the phase B porcelain sleeve, and the phase C porcelain sleeve all include an upper porcelain sleeve, a lower porcelain sleeve, a static contact, and a moving contact. The upper porcelain sleeve and the lower porcelain sleeve constitute an insulating chamber for breaking and insulating the static contact and the moving contact. The driving device includes a power module, a motor and a connecting device. The power module provides power to the motor, and the motor drives the connecting device and drives the rotating wheel of the transmission system. The relationship between the angle of rotation of the driving wheel by the driving unit and the displacement of the moving contact is: x represents the displacement of the moving contact, H represents the stroke of the moving contact, and δ is the rotation angle of the motor output shaft; The transmission system includes a rotating wheel, an output pull rod, a plurality of connecting rods, and an insulating pull rod. The output pull rod is driven by the rotation of the rotating wheel, and the output pull rod drives the plurality of connecting rods of the transmission system to achieve horizontal displacement of the plurality of connecting rods. The plurality of insulating pull rods are driven by the horizontal displacement of the plurality of connecting rods to drive the vertical mechanical linkage of the movable contacts of the A-phase porcelain sleeve, the B-phase porcelain sleeve, and the C-phase porcelain sleeve to achieve opening or closing of the circuit breaker. The transmission system includes an A-phase outer crank arm, a B-phase outer crank arm, a C-phase outer crank arm, an A-phase transmission shaft, a B-phase transmission shaft, a C-phase transmission shaft, an A-phase inner crank arm, a B-phase inner crank arm, a C-phase inner crank arm, a first inter-phase connecting rod, a second inter-phase connecting rod, a third inter-phase connecting rod, a fourth inter-phase connecting rod, and a rotating wheel.

2. The high-voltage circuit breaker according to claim 1, wherein the A-phase outer arm is connected to the first end of the first inter-phase connecting rod and the first end of the second inter-phase connecting rod; The B-phase outer crank arm is connected to the second end of the first inter-phase connecting rod, the second end of the second inter-phase connecting rod, the first end of the third inter-phase connecting rod, and the first end of the fourth inter-phase connecting rod; The C-phase outer crank arm is connected to the second end of the third inter-phase connecting rod and the second end of the fourth inter-phase connecting rod.

3. The high-voltage circuit breaker according to claim 1, wherein the first ends of the A-phase outer bend arm and the A-phase inner bend arm are connected to the A-phase transmission shaft; The B-phase outer crank arm, the first end of the B-phase inner crank arm, and the output pull rod are connected to the B-phase transmission shaft; The first ends of the C-phase outer crank arm and the C-phase inner crank arm are connected to the C-phase transmission shaft.

4. The high-voltage circuit breaker according to claim 1, wherein the second end of the A-phase inner bend arm is connected to the A-phase insulating pull rod; The second end of the B-phase inner crank arm is connected to the B-phase insulating pull rod; The second end of the C-phase inner elbow arm is connected to the C-phase insulating pull rod.

5. The high-voltage circuit breaker according to claim 1, wherein the driving device is arranged in a middle position just below the transmission system.

6. The high-voltage circuit breaker according to claim 1, wherein the rotation angle of the rotary wheel during the closing process is no more than 100 degrees, and the rotation angle of the rotary wheel during the opening process is no more than 90 degrees. The high-voltage circuit breaker according to claim 1 , wherein the motor is a permanent magnet synchronous motor.

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