A high-voltage circuit breaker with a controllable stroke for controlling the on-off current range

Abstract

The present invention discloses a high-voltage circuit breaker with a controllable stroke for controlling the on-off current range. It includes a controllable stroke mechanism. Through the action of a special-shaped output rod, multiple control ends can be operated simultaneously using a single operating end. With the cooperation of a single-phase oil tank and a detection component, the stroke of each connecting rod can be flexibly adjusted, and the operation is simple and convenient. At the same time, in the present invention, through the detection component, the leading and lagging phases of the A, B, and C phase currents of the circuit breaker body can be judged. Under the linkage of the connecting rods, the contact movement strokes of the three poles A, B, and C of the high-voltage circuit breaker are automatically adjusted, so as to perform synchronous movement but open or close the rated current or short-circuit current with a phase difference, enabling all three poles to interrupt the current in the short arc combustion interval and close the current at the zero crossing. Subsequently, the contact burning time is reduced, and the quantity of various metal ions and organic substances generated by burning is decreased, enabling the high-voltage circuit breaker to maintain a good working condition, thereby significantly extending the service life of the high-voltage circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of high - voltage circuit breaker equipment, and particularly to a high - voltage circuit breaker with a controllable stroke for controlling the switching current range. Background Art

[0002] A high - voltage circuit breaker is an important electrical equipment in the circuit system, which plays the role of opening or closing fault current, short - circuit current, rated current and capacitive no - load current. Since most power systems operate in a three - phase AC transmission and transformation mode, there is always a 120° phase difference between the A, B, and C phases. When an operating mechanism drives the three - pole arc - extinguishing chambers of the high - voltage circuit breaker to switch the current, due to the synchronous movement of the three - pole contacts, when the three - pole switches the current, one pole will switch the current within a current half - wave cycle, while the other pole or two poles will switch the current after more than one current half - wave cycle. The time of being burned by the current is longer, which will not only cause serious damage to the contacts, but also generate a large amount of metal ions and organic substances, affecting the working conditions of the high - voltage circuit breaker, resulting in a reduction in the service life of the high - voltage circuit breaker and a high working risk.

[0003] The method of using three operating mechanisms to drive the three - pole arc - extinguishing chambers to switch the current respectively is also a method that can control the non - synchronization of the three poles at present. However, the three operating mechanisms not only increase the cost, but also have instability due to electrical control. Moreover, all three operating mechanisms have the risk of non - operation. If a single pole or two poles refuse to operate, it will cause the power system to operate in a single - phase - loss state, causing great harm to the stability of the power system, and is more likely to cause the power transformer to catch fire or even explode due to single - phase - loss operation. Therefore, there is an urgent need for a high - voltage circuit breaker with a controllable stroke for controlling the switching current range to solve the above problems. Summary of the Invention

[0004] The present invention provides a high - voltage circuit breaker with a controllable stroke for controlling the switching current range, which can maintain good working conditions and extend the service life.

[0005] To achieve the above object, the present invention provides the following technical solution: A controllable stroke mechanism, comprising:

[0006] A plurality of connecting rods;

[0007] The operating member includes a special-shaped output rod, a plurality of single-phase fuel tanks, and an oil circuit located within the single-phase fuel tanks. One end of each connecting rod is inserted into the corresponding single-phase fuel tank and is in sliding seal with the oil circuit. An upper oil gap is formed by isolation between the inserted end of the connecting rod and the oil circuit. The special-shaped output rod includes an operating end and a plurality of control ends connected to the operating end. The movement of the operating end drives the synchronous movement of the plurality of control ends. Each control end is inserted into the corresponding single-phase fuel tank and is in sliding seal with the oil circuit. A middle oil gap is formed between the end of the control end and the inserted end of the connecting rod, and a lower oil gap is formed by isolation between the end of the control end and the oil circuit. With the movement of the special-shaped output rod, each connecting rod is driven to move;

[0008] The detecting member includes a terminal block, a phase detecting device, and a three-way high-speed solenoid valve installed on the oil circuit. The three-way high-speed solenoid valve is respectively communicated with the upper oil gap, the middle oil gap, and the lower oil gap. A current transformer and a voltage transformer are connected to the terminal block. The input end of the phase detecting device is connected to the terminal block, and is used for collecting line current and voltage signals, comparing and distinguishing the leading and lagging relationships of the three-phase currents, and forming a control logic. The output end of the phase detecting device is connected to the three-way high-speed solenoid valve, and controls the operation of the three-way high-speed solenoid valve based on the control logic to adjust the stroke of each connecting rod.

[0009] Preferably, the controllable stroke mechanism further includes a housing, and the operating member and the detecting member are both installed within the housing.

[0010] Preferably, the single-phase fuel tank and the special-shaped output rod are rigidly connected by bolts, and a first sealing ring is installed on the contact surface.

[0011] Preferably, the phase detecting device is connected to the terminal block through a transmission line, the phase detecting device is connected to the three-way high-speed solenoid valve through a solenoid valve control line, and a power terminal block is further installed within the housing. The power terminal block is connected to the phase detecting device through a power line to provide electrical energy.

[0012] Preferably, second sealing rings are provided between the connecting rod and the single-phase fuel tank, between the connecting rod and the oil circuit, between the special-shaped output rod and the single-phase fuel tank, and between the special-shaped output rod and the oil circuit, and sliding seals are formed through the second sealing rings.

[0013] Preferably, small holes are opened on the single-phase fuel tank at the positions of the upper oil gap, the middle oil gap, and the lower oil gap according to the limit values of the phase difference strokes, and the three-way high-speed solenoid valve is respectively communicated with the upper oil gap, the middle oil gap, and the lower oil gap through the respective small holes.

[0014] Preferably, the installation methods of the single-phase fuel tanks include a linear arrangement and a triangular arrangement.

[0015] A high-voltage circuit breaker with a controllable stroke for controlling the opening and closing current range, including a circuit breaker body. Inside the circuit breaker body, a static contact, a moving contact, and an arc extinguishing nozzle are installed. Each moving contact of the circuit breaker body is connected to one end of each connecting rod away from the oil circuit, and drives the moving contact to combine with or separate from the static contact as the connecting rod moves.

[0016] Preferably, both the static contact and the moving contact are made of copper or copper alloy components, and the arc extinguishing nozzle is made of an organic material component.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, through the action of the special-shaped output rod, a single operating end can be used to operate multiple control ends at the same time, and with the cooperation of the single-phase oil tank and the detection component, the stroke of each connecting rod can be flexibly adjusted, and the operation is simple and convenient. At the same time, in the present invention, through the detection component, the leading and lagging phases of the A, B, and C phase currents of the circuit breaker body can be judged. Under the linkage of the connecting rods, the contact movement strokes of the A, B, and C poles of the high-voltage circuit breaker are automatically adjusted, so as to synchronously move but stagger the opening or closing of the rated current or short-circuit current, so that all three poles are in the short arc-burning interval to break the current and close the current at the zero crossing, thereby reducing the contact burning time and the quantity of various metal ions and organic substances generated by the burning, keeping the high-voltage circuit breaker in a better working condition, and thus greatly extending the working life of the high-voltage circuit breaker. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention.

[0019] In the drawings:

[0020] Figure 1 is a schematic structural diagram of the high-voltage circuit breaker based on the controllable stroke mechanism for controlling the opening and closing current range of the present invention;

[0021] Figure 2 is a schematic structural diagram of the connection between the operating member and a single pole of the circuit breaker body of the present invention;

[0022] Figure 3 is a schematic structural diagram of the installation method of the single-phase oil tank of the present invention;

[0023] Reference numerals in the drawings: 1. Circuit breaker body; 2. Static contact; 3. Arc extinguishing nozzle; 4. Moving contact; 5. Connecting rod; 6. Housing; 7. Single-phase oil tank; 8. First sealing ring; 9. Bolt; 10. Special-shaped output rod; 11. Terminal block; 12. Transmission line; 13. Power supply terminal block; 14. Power cord; 15. Phase detection device; 16. Operating member; 17. Oil circuit; 18. Three-way high-speed solenoid valve; 19. Solenoid valve control line; 20. Lower oil gap; 21. Middle oil gap; 22. Upper oil gap; 23. Second sealing ring. Detailed implementation manners

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] Embodiment 1: As shown in Figure 2-3 the figure, a controllable stroke mechanism includes: a plurality of connecting rods 5, an operating member 16 and a detecting member; wherein, the operating member 16 includes a special-shaped output rod 10 and a plurality of single-phase oil tanks 7, and an oil passage 17 located in the single-phase oil tank 7. One end of each connecting rod 5 is inserted into the corresponding single-phase oil tank 7 and is in sliding seal with the oil passage 17. Wherein, an upper oil gap 22 is formed by isolation between the inserted end of the connecting rod 5 and the oil passage 17. The special-shaped output rod 10 includes an operating end and a plurality of control ends connected to the operating end. The movement of the operating end drives the synchronous movement of the plurality of control ends. Each control end is inserted into the corresponding single-phase oil tank 7 and is in sliding seal with the oil passage 17. Wherein, a middle oil gap 21 is formed between the end of the control end and the inserted end of the connecting rod 5, and a lower oil gap 20 is formed by isolation between the end of the control end and the oil passage 17. And the single-phase oil tank 7 and the special-shaped output rod 10 are rigidly connected by bolts 9, and a first sealing ring 8 is installed on the contact surface. With the movement of the special-shaped output rod 10, each connecting rod 5 is driven to move; the detecting member includes a terminal block 11, a phase detecting device 15, and a three-way high-speed solenoid valve 18 installed on the oil passage 17. The three-way high-speed solenoid valve 18 is respectively communicated with the upper oil gap 22, the middle oil gap 21 and the lower oil gap 20. A current transformer and a voltage transformer are connected to the terminal block 11. The input end of the phase detecting device 15 is connected to the terminal block 11, and is used for collecting line current and voltage signals, comparing and distinguishing the lead-lag relationship of three-phase currents, forming a control logic. The output end of the phase detecting device 15 is connected to the three-way high-speed solenoid valve 18, and controls the operation of the three-way high-speed solenoid valve 18 based on the control logic to adjust the stroke of each connecting rod 5.

[0026] In this embodiment, the controllable stroke mechanism further includes a housing 6. The operating member 16 and the detecting member are both installed in the housing 6. The housing 6 plays a role in dust prevention, rain prevention, heat preservation and avoiding touch, reducing the influence of the operating member 16 and the detecting member by the external and natural environment;

[0027] Refer to Figure 2 the figure, the phase detecting device 15 is connected to the terminal block 11 through a transmission line 12. The phase detecting device 15 is connected to the three-way high-speed solenoid valve 18 through a solenoid valve control line 19. A power supply terminal block 13 is also installed in the housing 6. The power supply terminal block 13 is connected to the phase detecting device 15 through a power supply line 14 to provide electric energy.

[0028] Refer to Figure 2As shown, second sealing rings 23 are provided between the connecting rod 5 and the single-phase oil tank 7, between the connecting rod 5 and the oil circuit 17, between the special-shaped output rod 10 and the single-phase oil tank 7, and between the special-shaped output rod 10 and the oil circuit 17, and sliding seals are formed through the second sealing rings 23.

[0029] Reference Figure 2 As shown, small holes are opened at the upper oil gap 22, the middle oil gap 21, and the lower oil gap 20 on the single-phase oil tank 7 according to the limit values of the phase difference stroke, and the three-way high-speed solenoid valve 18 is respectively communicated with the upper oil gap 22, the middle oil gap 21, and the lower oil gap 20 through each small hole.

[0030] Reference Figure 3 As shown, the installation methods of the single-phase oil tanks 7 include in a straight line and in a character shape.

[0031] During operation, sufficient hydraulic oil is filled in the upper oil gap 22, the middle oil gap 21, and the lower oil gap 20. The phase detection device 15 obtains waveform signals from the line current transformer and the voltage transformer, analyzes the lead-lag relationship between the three-phase voltage and current, forms logical control of the three-way high-speed solenoid valve 18, operates the operating end of the special-shaped output rod 10, and synchronously drives each control end. By logically controlling the three-way high-speed solenoid valve 18, the capacity of the upper oil gap 22, the middle oil gap 21, or the lower oil gap 20 is increased, thereby controlling the movement stroke of the connecting rod 5.

[0032] Embodiment 2, as Figure 1-2 As shown, a high-voltage circuit breaker capable of controlling the opening and closing current range with a controllable stroke includes a circuit breaker body 1 and the above-mentioned controllable stroke mechanism. A static contact 2, a moving contact 4, and an arc extinguishing nozzle 3 are installed in the circuit breaker body 1. Each moving contact 4 of the circuit breaker body 1 is respectively connected to one end of each connecting rod 5 away from the oil circuit 17, and drives the moving contact 4 to be combined with or separated from the static contact 2 as the connecting rod 5 moves. Among them, both the static contact 2 and the moving contact 4 are components made of copper or copper alloy, and the arc extinguishing nozzle 3 is a component made of organic matter.

[0033] As Figure 1As shown, the static-side contact 2 and the dynamic-side contact 4 are separated or combined by the drive of the connecting rod 5. During the movement of the connecting rod 5, an arc is generated to burn itself, and a large amount of metal ions are generated as the burning time extends until the current passes through zero and extinguishes. The arc extinguishing nozzle 3 is also burned by the arc generated between the static-side contact 2 and the dynamic-side contact 4, and a large amount of organic dust is separated as the burning time extends. For example, when the phase voltage of phase A leads the phase voltage of phase B, it is detected by the above-mentioned detection component and forms a logic control. Driven by the action of the special-shaped output rod 10, the capacity of the middle oil gap 21 is increased through the logic control of the three-way high-speed solenoid valve 18, so as to form a rigid oil gap stroke. During three-phase synchronous operation, phase A will inevitably be opened or closed first due to the lengthening of the connecting rod 5, so as to reach the ideal breaking interval and zero-crossing closing time. When the leading-lagging relationship of the three phases of the line changes, the leading-lagging relationship of the three-phase arc extinguishing chambers can also be adjusted according to the control logic.

[0034] Finally, it should be noted that the above are only the preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A controllable stroke mechanism, characterized in that, Comprising: A plurality of connecting rods; An operating member, including a special-shaped output rod and a plurality of single-phase oil tanks, as well as an oil path located within the single-phase oil tanks. One end of each connecting rod is inserted into a corresponding single-phase oil tank and is in sliding seal with the oil path. Wherein, an upper oil gap is formed by isolation between the inserted end of the connecting rod and the oil path. The special-shaped output rod includes an operating end and a plurality of control ends connected to the operating end. The movement of the operating end drives the synchronous movement of the plurality of control ends. Each control end is inserted into a corresponding single-phase oil tank and is in sliding seal with the oil path. Wherein, a middle oil gap is formed between the end of the control end and the inserted end of the connecting rod, and a lower oil gap is formed by isolation between the end of the control end and the oil path. With the movement of the special-shaped output rod, each connecting rod is driven to move; A detecting member, including a terminal block, a phase detecting device, and a three-way high-speed solenoid valve installed on the oil path. The three-way high-speed solenoid valve is respectively communicated with the upper oil gap, the middle oil gap, and the lower oil gap. A current transformer and a voltage transformer are connected to the terminal block. The input end of the phase detecting device is connected to the terminal block, and is used for collecting line current and voltage signals, comparing and distinguishing the lead-lag relationship of three-phase currents, forming a control logic. The output end of the phase detecting device is connected to the three-way high-speed solenoid valve, and controls the operation of the three-way high-speed solenoid valve based on the control logic to adjust the stroke of each connecting rod.

2. The controllable stroke mechanism according to claim 1, characterized in that: The controllable stroke mechanism further includes a housing, and the operating member and the detecting member are both installed within the housing.

3. The controllable stroke mechanism according to claim 1, characterized in that: The single-phase oil tank is rigidly connected to the special-shaped output rod by bolts, and a first sealing ring is installed on the contact surface.

4. A controllable stroke mechanism according to claim 2, characterized in that: The phase detecting device is connected to the terminal block through a transmission line, and the phase detecting device is connected to the three-way high-speed solenoid valve through a solenoid valve control line. A power supply terminal block is also installed within the housing, and the power supply terminal block is connected to the phase detecting device through a power supply line for providing electrical energy.

5. A controllable stroke mechanism according to claim 1, characterized in that: Second sealing rings are provided between the connecting rod and the single-phase oil tank, between the connecting rod and the oil path, between the special-shaped output rod and the single-phase oil tank, and between the special-shaped output rod and the oil path, and are in sliding seal through the second sealing rings.

6. The controllable stroke mechanism according to claim 1, wherein: Small holes are opened on the single-phase oil tank at the positions of the upper oil gap, the middle oil gap, and the lower oil gap according to the limit value of the phase difference stroke, and the three-way high-speed solenoid valve is respectively communicated with the upper oil gap, the middle oil gap, and the lower oil gap through each small hole.

7. A controllable stroke mechanism according to claim 1, characterized in that: The installation methods of each single-phase oil tank include a linear shape and a "pin" shape.

8. A high-voltage circuit breaker with a controllable stroke for controlling the opening and closing current range, comprising a circuit breaker body and the controllable stroke mechanism described in claim 1, characterized in that: A static-side contact, a moving-side contact, and an arc extinguishing nozzle are installed within the circuit breaker body. Each moving-side contact of the circuit breaker body is respectively connected to one end of each connecting rod away from the oil path, and with the movement of the connecting rod, the moving-side contact is driven to be combined with or separated from the static-side contact.

9. The high-voltage circuit breaker with a controllable stroke for controlling the on-off current range according to claim 8, characterized in that: Both the static-side contact and the moving-side contact are components made of copper or copper alloy material, and the arc extinguishing nozzle is a component made of organic material.

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