equalizing circuit breaker

Abstract

This invention proposes a voltage equalization circuit breaker. The voltage equalization circuit breaker includes a porcelain column circuit breaker and a voltage equalization device. The porcelain column circuit breaker includes a first arc-extinguishing unit, a second arc-extinguishing unit, a support post, and a tee. The voltage equalization device includes a first voltage equalization capacitor, a second voltage equalization capacitor, a first side voltage equalization ring, and a second side voltage equalization ring. The first and second side voltage equalization rings are formed as annular tubular components. This disclosure solves the problems of insulation structure failure and arc generation in existing circuit breakers used in high-altitude areas.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical technology, and more specifically to an equalizing circuit breaker. Background Technology

[0002] In the field of high-voltage electrical technology, after power plants generate electricity, it is transmitted from the power source side to the load side. In the prior art, a circuit breaker is installed in a section of high-voltage circuit. The two ends of the circuit breaker are electrically connected to the power source side conductor and the load side conductor of the high-voltage circuit, respectively, to control the current interruption of this section of high-voltage circuit.

[0003] However, when this device is used on high-voltage circuits at high altitudes, the electric field strength on the circuit breaker is high, even exceeding the maximum electric field strength allowed to be applied to the insulation structure. In other words, in high-altitude areas with lower air density, the insulation strength of the insulation structure is reduced. When voltage surges occur on the high-voltage circuit, it is more likely to cause insulation failure in high-voltage electrical equipment and arcing, thus reducing the reliability of the circuit breaker.

[0004] In other words, existing circuit breakers for high-altitude areas suffer from insulation failure and arcing issues. Summary of the Invention

[0005] This disclosure aims to provide an equalizing circuit breaker with optimized structure and performance to address the problems of insulation failure and arcing in existing circuit breakers used in high-altitude areas.

[0006] To achieve the above objectives, this disclosure provides an equalizing circuit breaker, comprising a porcelain column circuit breaker and an equalizing device. The porcelain column circuit breaker includes a first arc-extinguishing unit, a second arc-extinguishing unit, a support post, and a tee. The first arc-extinguishing unit includes a first incoming conductor connected to the power supply side conductor and a first outgoing conductor connected to the second end of the tee. The second arc-extinguishing unit includes a second incoming conductor connected to the third end of the tee and a second outgoing conductor connected to the load side conductor. The support post includes a top mounting surface connected to the first end of the tee. The support post supports the tee and the first and second arc-extinguishing units connected to the tee. The second end of the tee is electrically connected to the third end of the tee. The first and second arc-extinguishing units are connected in series between the power supply side conductor and the load side conductor. The voltage equalization device includes a first voltage equalization capacitor, a second voltage equalization capacitor, a first side voltage equalization ring, and a second side voltage equalization ring. The first voltage equalization capacitor is connected in parallel with the first arc-extinguishing unit between the power supply side conductor and the second end of the tee, thereby connecting the second voltage equalization capacitor in parallel with the second arc-extinguishing unit between the third end of the tee and the load side conductor. The first side voltage equalization ring is formed with an annular tubular component and is electrically connected to the first inlet conductor of the first arc-extinguishing unit. The second side voltage equalization ring is also formed with an annular tubular component and is electrically connected to the second outlet conductor of the second arc-extinguishing unit. The first and second voltage equalization capacitors are used to absorb or release charge during the opening operation of the first and second arc-extinguishing units, ensuring that the voltage between the first inlet conductor and the first outlet conductor is equal to the voltage between the second inlet conductor and the second outlet conductor. Furthermore, the first side equalizing ring and the second side equalizing ring are electrically connected to the porcelain column circuit breaker. The first side equalizing ring and the second side equalizing ring provide additional surface area so that the charge on the porcelain column circuit breaker is distributed on the annular surface of the first side equalizing ring and the second side equalizing ring.

[0007] Because the first and second equalizing capacitors have the ability to absorb and redistribute charge, when there is a voltage difference between the first incoming conductor and the first outgoing conductor and between the second incoming conductor and the second outgoing conductor, the charge is redistributed between the first and second equalizing capacitors until the voltage difference between the first incoming conductor and the first outgoing conductor and between the second incoming conductor and the second outgoing conductor disappears, reducing the possibility of arcing. Properly setting the diameter of the first and second side equalizing rings can provide additional surface area relative to the porcelain column circuit breaker, while reducing the curvature of their surfaces. This allows the electric field intensity concentrated at sharp edges to be dispersed onto the smooth annular surfaces of the first and second side equalizing rings, suppressing tip discharge while reducing the peak electric field intensity on the equalizing circuit breaker, thus enhancing the operational stability and safety of the equalizing circuit breaker.

[0008] Furthermore, the first and second arc-extinguishing units are symmetrically arranged on both sides of the support column, thus forming a T-shaped structure with the support column and the first and second arc-extinguishing units. The first and second arc-extinguishing units extend coaxially along the first axis, and the first and second voltage-equalizing capacitors extend coaxially along the second axis, with the first and second axes being parallel. The support column forming the T-shaped structure extends along a third axis, which is perpendicular to the first and second axes.

[0009] The first arc-extinguishing unit, the second arc-extinguishing unit, the first voltage-equalizing capacitor, and the second voltage-equalizing capacitor are all columnar. The support pillars are located in the vertical part of the T-shaped structure, providing support, while the first and second arc-extinguishing units are located in the horizontal part of the T-shaped structure, increasing the stability of the voltage-equalizing circuit breaker. In other words, the first and second arc-extinguishing units, the first voltage-equalizing capacitor, and the second voltage-equalizing capacitor are arranged in the same direction, but the first and second arc-extinguishing units are on different axes from the first and second voltage-equalizing capacitors.

[0010] Further, the first equalizing capacitor includes a first capacitor connection terminal electrically connected to the first input conductor and a second capacitor connection terminal electrically connected to the first output conductor. The second equalizing capacitor includes a third capacitor connection terminal electrically connected to the second input conductor and a fourth capacitor connection terminal electrically connected to the second output conductor. The annular plane of the first side equalizing ring is perpendicular to the first axis and the second axis. The first capacitor connection terminal and the first input conductor are on the annular plane of the first side equalizing ring and are located within the area enclosed by the annular tubular component of the first side equalizing ring. The annular plane of the second side equalizing ring is perpendicular to the first axis and the second axis. The fourth capacitor connection terminal and the second output conductor are on the annular plane of the second side equalizing ring and are located within the area enclosed by the annular tubular component of the second side equalizing ring.

[0011] The above structural configuration enables the parallel connection of the first arc-extinguishing unit and the first voltage-equalizing capacitor, as well as the parallel connection of the second arc-extinguishing unit and the second voltage-equalizing capacitor. The area enclosed by the annular tubular component of the first side voltage-equalizing ring can cover the ends of all electrically connected components, that is, the equipotential surface of the first side voltage-equalizing ring covers the first capacitor connection terminal and the first input conductor, guiding and dispersing the electric field intensity distribution on the tips near the first capacitor connection terminal and the first input conductor. The area enclosed by the annular tubular component of the second side voltage-equalizing ring can cover the ends of all electrically connected components, that is, the equipotential surface of the second side voltage-equalizing ring covers the fourth capacitor connection terminal and the second output conductor, guiding and optimizing the electric field intensity distribution on the tips near the fourth capacitor connection terminal and the second output conductor.

[0012] Furthermore, the length of the first equalizing capacitor extending along the second axis is the first dry arc distance, and the length of the second equalizing capacitor extending along the second axis is the second dry arc distance. The first dry arc distance and the second dry arc distance are the same and are within the range of 2150mm to 2250mm.

[0013] By properly setting the first and second dry arc distances, the flashover voltage of the equalizing circuit breaker in the air can be effectively increased, making it more difficult for the air to break down and ensuring that the equalizing circuit breaker can still operate safely and reliably under the worst conditions.

[0014] Furthermore, the first side equalizing ring having an annular tubular component and the second side equalizing ring having an annular tubular component have the same pipe diameter, which is in the range of 115 mm to 125 mm.

[0015] By properly setting the pipe diameters of the first and second side equalizing rings, the surface smoothness and surface area of ​​the first and second side equalizing rings can be improved, which is beneficial for dispersing the electric field, reducing the peak value of the electric field intensity on the equalizing circuit breaker, and thus improving the ability of the equalizing circuit breaker to suppress tip discharge.

[0016] Furthermore, the voltage equalization device includes a first inner surface connector and a second inner surface connector, wherein: the first inner surface connector supports the first side voltage equalization ring and electrically connects the first side voltage equalization ring to the first inlet conductor, and the second inner surface connector supports the second side voltage equalization ring and electrically connects the second side voltage equalization ring to the second outlet conductor.

[0017] The first inner surface connector and the second inner surface connector serve as supporting structures, ensuring the stability of the first side equalizing ring and the second side equalizing ring relative to the porcelain column circuit breaker, respectively. At the same time, they ensure that the first side equalizing ring directly contacts the first incoming conductor to form a circuit, and the second side equalizing ring directly contacts the second outgoing conductor to form a circuit.

[0018] Furthermore, the first inner surface connector has a first plate and a second plate extending parallel to and perpendicularly intersecting the annular plane of the first side equalizing ring. The first plate traverses the area enclosed by the annular tubular component of the first side equalizing ring, and both ends of the first plate are fixedly connected to the annular surface of the first side equalizing ring. The two ends of the second plate are respectively fixedly connected to the first plate and the annular surface of the first side equalizing ring. The second inner surface connector has a third plate and a fourth plate extending parallel to and perpendicularly intersecting the annular plane of the second side equalizing ring. The third plate traverses the area enclosed by the annular tubular component of the second side equalizing ring, and both ends of the third plate are fixedly connected to the annular surface of the second side equalizing ring. The two ends of the fourth plate are respectively fixedly connected to the third plate and the annular surface of the second side equalizing ring.

[0019] The structure consisting of a first plate with its two ends fixedly connected to the annular surface of the first side equalizing ring, and a second plate with its two ends fixedly connected to both the first plate and the annular surface of the first side equalizing ring, helps to disperse the stress borne by the annular surface of the first side equalizing ring and improves its vibration resistance. Similarly, the structure consisting of a third plate with its two ends fixedly connected to the annular surface of the second side equalizing ring, and a fourth plate with its two ends fixedly connected to both the third plate and the annular surface of the second side equalizing ring, also helps to disperse the stress borne by the annular surface of the second side equalizing ring and improves its vibration resistance.

[0020] Further, the voltage equalization device includes a first connector, a second connector, a third connector, and a fourth connector, wherein: the first and second connectors extend along an annular plane parallel to the first side voltage equalization ring and are used to fixably connect the first arc-extinguishing unit and the first voltage equalization capacitor; the third and fourth connectors extend along an annular plane parallel to the second side voltage equalization ring and are used to fixably connect the second arc-extinguishing unit and the second voltage equalization capacitor. The first capacitor connection terminal is electrically connected to the first input conductor via the first connector; the second capacitor connection terminal is electrically connected to the first output conductor via the second connector; the third capacitor connection terminal is electrically connected to the second input conductor via the third connector; and the fourth capacitor connection terminal is electrically connected to the second output conductor via the fourth connector.

[0021] The first arc-extinguishing unit and the first voltage-equalizing capacitor are arranged in parallel, and the second arc-extinguishing unit and the second voltage-equalizing capacitor are arranged in parallel to ensure that the overall force of the voltage-equalizing circuit breaker is balanced. At the same time, the voltage-equalizing device can eliminate the voltage difference between the first incoming conductor and the first outgoing conductor and between the second incoming conductor and the second outgoing conductor.

[0022] Furthermore, the porcelain-column circuit breaker includes a first terminal block and a second terminal block, wherein: the first terminal block is bolted to the first incoming conductor and electrically connected to the first incoming conductor and the first connector; the second terminal block is bolted to the second outgoing conductor and electrically connected to the second outgoing conductor and the fourth connector. The first terminal block extends in a direction parallel to the annular plane of the first side equalizing ring, and the second terminal block extends in a direction parallel to the annular plane of the second side equalizing ring.

[0023] The above structural design ensures that the power supply side wires are directly connected to the first terminal block, and the load side wires are directly connected to the second terminal block.

[0024] Furthermore, the equalizing device includes a shielding ring, which is fixedly installed between the top mounting surface of the support column and the first end of the tee. The shielding ring is formed as having an annular tubular component, and the diameter of the shielding ring having an annular tubular component is in the range of 115 mm to 125 mm.

[0025] The differences in components between the first and second arc-extinguishing units and the support column lead to voltage differences, and parasitic voltages to ground also exist on the support column. Under abnormal conditions such as operational overvoltage or lightning strikes, the electric field strength on the top mounting surface of the support column increases. Because the shielding ring is a ring-shaped tubular component with a smooth surface, and provides additional surface area compared to using only a porcelain column circuit breaker, the electric field concentrated at the sharp edge is dispersed onto the larger smooth surface of the shielding ring, thereby suppressing tip discharge.

[0026] Furthermore, the equalizing device includes a third inner surface connector, which supports the shielding ring and electrically connects the shielding ring to the first end of the tee.

[0027] The third inner surface connector serves as a support structure, ensuring the stability of the shielding ring relative to the porcelain column circuit breaker, while also ensuring that the shielding ring and the first end of the tee form a direct contact path.

[0028] Furthermore, the third inner surface connector has a fifth plate and a sixth plate that intersect perpendicularly. The fifth plate traverses the area enclosed by the annular tubular component of the shielding ring. Both ends of the fifth plate are fixedly connected to the annular surface of the shielding ring, and both ends of the sixth plate are fixedly connected to the fifth plate and the annular surface of the shielding ring, respectively.

[0029] The structure in which the two ends of the fifth plate are fixedly connected to the annular surface of the shielding ring, and the two ends of the sixth plate are fixedly connected to the annular surfaces of the fifth plate and the shielding ring respectively, helps to disperse the stress borne by the annular surface of the shielding ring and improve the vibration resistance.

[0030] Furthermore, the capacitance of the first voltage-equalizing capacitor is equal to the capacitance of the second voltage-equalizing capacitor.

[0031] The first and second equalizing capacitors have the same capacitance value and store the same amount of charge. This helps the first and second equalizing capacitors actively eliminate the voltage difference between the first incoming conductor and the first outgoing conductor and between the second incoming conductor and the second outgoing conductor when the first and second arc-extinguishing units perform the tripping operation, thereby improving the insulation performance and arc-extinguishing efficiency of the equalizing circuit breaker.

[0032] A porcelain-column circuit breaker with a T-type structure includes a first arc-extinguishing unit and a second arc-extinguishing unit. After the first and second arc-extinguishing units are opened, there is a voltage between the first incoming conductor and the first outgoing conductor of the first arc-extinguishing unit, and there is also a voltage between the second incoming conductor and the second outgoing conductor of the second arc-extinguishing unit. Due to differences in components and the influence of parasitic voltage to ground, the voltage between the first incoming conductor and the first outgoing conductor differs significantly from the voltage between the second incoming conductor and the second outgoing conductor.

[0033] Specifically, the first voltage equalizing capacitor of this disclosure is disposed between the first input conductor and the first output conductor, and is connected in parallel with the first arc-extinguishing unit. The second voltage equalizing capacitor is disposed between the second input conductor and the second output conductor, and is connected in parallel with the second arc-extinguishing unit. Since the first and second voltage equalizing capacitors have the ability to absorb and redistribute charge, when there is a voltage difference between the first input conductor and the first output conductor and between the second input conductor and the second output conductor, charge is redistributed between the first and second voltage equalizing capacitors until the voltage difference between the first input conductor and the first output conductor and between the second input conductor and the second output conductor disappears, reducing the possibility of arc generation.

[0034] This disclosure simultaneously sets up a first arc-extinguishing unit and a second arc-extinguishing unit connected in series with a tee fitting. A first side equalizing ring is connected in series with the first arc-extinguishing unit via a first inlet conductor, and a second side equalizing ring is connected in series with the second outlet conductor. This arrangement, with the first side equalizing ring, the first arc-extinguishing unit, the tee fitting, the second arc-extinguishing unit, and the second side equalizing ring connected in series sequentially, addresses this issue. In a high-voltage electric field, the electric field strength at sharp or protruding points is much higher than at flat points, leading to point discharge. By appropriately setting the diameter of the first and second side equalizing rings, additional surface area can be provided relative to the porcelain-column circuit breaker, while simultaneously reducing the curvature of their surfaces. This disperses the electric field strength concentrated at the sharp edges onto the smooth annular surfaces of the first and second side equalizing rings, suppressing point discharge while reducing the peak electric field strength on the equalizing circuit breaker, thus enhancing the operational stability and safety of the equalizing circuit breaker. Attached Figure Description

[0035] The features and advantages of one or more embodiments of the present invention will become more readily apparent from the following description with reference to the accompanying drawings. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. The drawings are not drawn to scale and some features may be enlarged or reduced to show detail of specific parts. In the drawings: Figure 1 A schematic perspective view of an equalizing circuit breaker according to an alternative embodiment of the present disclosure is shown; Figure 2 It shows Figure 1 A schematic 3D view of part of the structure of a medium-voltage equalization circuit breaker; Figure 3 The diagram shows a simulation of the electric field strength at the first equalizing capacitor when the first dry arc distance of the equalizing circuit breaker in Embodiment 1 is set to 2200mm, the first side equalizing ring has a single ring structure and a pipe diameter of 120mm. Figure 4The diagram shows a simulation of the electric field strength at the first terminal block when the first dry arc distance of the equalizing circuit breaker in Embodiment 1 is set to 2200mm, the first side equalizing ring has a single ring structure and a pipe diameter of 120mm. Figure 5 The diagram shows a simulation of the electric field strength at the first side equalizing ring when the first dry arc distance of the equalizing circuit breaker in Embodiment 1 is set to 2200mm, the first side equalizing ring has a single ring structure and a pipe diameter of 120mm. Figure 6 The diagram shows the electric field strength at the first equalizing capacitor when the first dry arc distance of the equalizing circuit breaker in Embodiment 2 is set to be 2100mm, the first side equalizing ring has a single ring structure and the pipe diameter is 82mm. Figure 7 The diagram shows the electric field strength at the first terminal block when the equalizing circuit breaker of Embodiment 2 has a first dry arc distance of 2100mm, a first side equalizing ring with a single ring structure and a pipe diameter of 82mm. Figure 8 The diagram shows a simulation of the electric field strength at the first side equalizing ring when the first dry arc distance of the equalizing circuit breaker in Embodiment 2 is set to 2100mm, the first side equalizing ring has a single ring structure and a pipe diameter of 82mm. Figure 9 The diagram shows a simulation of the electric field strength at the first equalizing capacitor when the first dry arc distance of the equalizing circuit breaker in Embodiment 3 is set to 2200mm, the first side equalizing ring has a double ring structure and a pipe diameter of 76mm. Figure 10 The diagram shows the electric field strength at the first terminal block when the first dry arc distance of the equalizing circuit breaker in Embodiment 3 is set to 2200mm, the first side equalizing ring has a double ring structure and a pipe diameter of 76mm. Figure 11 The diagram shows a simulation of the electric field strength at the first side equalizing ring when the first dry arc distance of the equalizing circuit breaker in Embodiment 3 is set to 2200mm, the first side equalizing ring has a double ring structure and a pipe diameter of 76mm.

[0036] Explanation of icon numbers: Detailed Implementation

[0037] The technical solutions in the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0038] In the following detailed description, reference is made to the accompanying drawings, which form a part of this specification, wherein specific embodiments of the present disclosure are illustrated by way of example. With respect to the drawings, directional terms such as “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” and “rear” are used with reference to the orientation of the drawings described. Since components of embodiments of the present disclosure can be positioned in many different orientations, directional terms are used for illustration only and are not intended to be limiting. It should be understood that other embodiments may be used, and structural or logical changes may be made without departing from the scope of the present disclosure. Therefore, the following detailed description should not be construed as limiting, and the present disclosure is defined by the appended claims.

[0039] It should be noted that the allowable electric field strength refers to the maximum electric field strength value permitted by the insulation system in actual operation. In this disclosure, the allowable electric field strength is selected as 2.2 kV / mm. The maximum phase voltage refers to the maximum voltage value of the AC circuit within one cycle. The rated short-time power frequency withstand voltage value refers to the maximum power frequency voltage that the equalizing circuit breaker can continuously withstand at the specified power frequency. The rated lightning impulse withstand voltage value refers to the maximum voltage value that the equalizing circuit breaker can withstand without damage or destruction when subjected to a momentary high-voltage impulse similar to lightning at the specified power frequency. The rated switching impulse withstand voltage value refers to the maximum transient voltage that the equalizing circuit breaker can withstand during normal operation (such as opening and closing).

[0040] To address the problems of insulation failure and arcing in existing circuit breakers used in high-altitude areas, this disclosure provides an equalizing circuit breaker.

[0041] like Figures 1 to 11As shown, the equalizing circuit breaker includes a porcelain column circuit breaker and an equalizing device. The porcelain column circuit breaker includes a first arc-extinguishing unit 21, a second arc-extinguishing unit 22, a support post 10, and a tee member 11. The first arc-extinguishing unit 21 includes a first incoming conductor 211 connected to the power supply side conductor and a first outgoing conductor 212 connected to the second end 112 of the tee member 11. The second arc-extinguishing unit 22 includes a second incoming conductor 221 connected to the third end 113 of the tee member 11 and a second outgoing conductor 222 connected to the load side conductor. The support post 10 includes a top mounting surface connected to the first end 111 of the tee member 11. The support post 10 supports the tee member 11 and the first and second arc-extinguishing units 21 and 22 connected to the tee member 11. The second end 112 of the tee member 11 is electrically connected to the third end 113 of the tee member 11, thereby connecting the first and second arc-extinguishing units 21 and 22 in series between the power supply side conductor and the load side conductor. The voltage equalization device includes a first voltage equalization capacitor 31, a second voltage equalization capacitor 32, a first side voltage equalization ring 41, and a second side voltage equalization ring 42. The first voltage equalization capacitor 31 is connected in parallel with the first arc-extinguishing unit 21 between the power supply side conductor and the second end 112 of the tee member 11. The second voltage equalization capacitor 32 is connected in parallel with the second arc-extinguishing unit 22 between the third end 113 of the tee member 11 and the load side conductor. The first side voltage equalization ring 41 is formed with an annular tubular component and is electrically connected to the first inlet conductor 211 of the first arc-extinguishing unit 21. The second side voltage equalization ring 42 is also formed with an annular tubular component and is electrically connected to the second outlet conductor 222 of the second arc-extinguishing unit 22.

[0042] The first equalizing capacitor 31 and the second equalizing capacitor 32 are used to absorb or release charge during the opening operation of the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22, so that the voltage between the first incoming conductor 211 and the first outgoing conductor 212 is equal to the voltage between the second incoming conductor 221 and the second outgoing conductor 222. Furthermore, the first side equalizing ring 41 and the second side equalizing ring 42 are electrically connected to the porcelain column circuit breaker, and by providing additional surface area, the first side equalizing ring 41 and the second side equalizing ring 42 disperse the charge on the porcelain column circuit breaker on their annular surfaces.

[0043] A porcelain-column circuit breaker with a T-type structure includes a first arc-extinguishing unit 21 and a second arc-extinguishing unit 22. After the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22 are tripped, there is a voltage between the first incoming conductor 211 and the first outgoing conductor 212 of the first arc-extinguishing unit 21, and there is also a voltage between the second incoming conductor 221 and the second outgoing conductor 222 of the second arc-extinguishing unit 22. Due to differences in components and the influence of parasitic voltage to ground, the voltage between the first incoming conductor 211 and the first outgoing conductor 212 is significantly different from the voltage between the second incoming conductor 221 and the second outgoing conductor 222.

[0044] Specifically, the first equalizing capacitor 31 of this disclosure is disposed between the first input conductor 211 and the first output conductor 212, and is connected in parallel with the first arc-extinguishing unit 21. The second equalizing capacitor 32 is disposed between the second input conductor 221 and the second output conductor 222, and is connected in parallel with the second arc-extinguishing unit 22. Since the first equalizing capacitor 31 and the second equalizing capacitor 32 have the ability to absorb and redistribute charge, when there is a voltage difference between the first input conductor 211 and the first output conductor 212 and the voltage difference between the second input conductor 221 and the second output conductor 222, the charge is redistributed between the first equalizing capacitor 31 and the second equalizing capacitor 32 until the voltage difference between the first input conductor 211 and the first output conductor 212 and the voltage difference between the second input conductor 221 and the second output conductor 222 disappears, reducing the possibility of arc generation.

[0045] This disclosure simultaneously sets a first arc-extinguishing unit 21 and a second arc-extinguishing unit 22 in series with the tee fitting 11. A first side equalizing ring 41 is connected in series with the first arc-extinguishing unit 21 via a first inlet conductor 211, and a second side equalizing ring 42 is connected in series with the second outlet conductor 222, so that the first side equalizing ring 41, the first arc-extinguishing unit 21, the tee fitting 11, the second arc-extinguishing unit 22, and the second side equalizing ring 42 are sequentially connected in series. In a high-voltage electric field, the electric field strength at a sharp or protruding part is much higher than that at a flat part, thus causing tip discharge. By rationally setting the pipe diameters of the first side equalizing ring 41 and the second side equalizing ring 42, an additional surface area can be provided relative to the porcelain column circuit breaker. At the same time, the curvature of its surface is reduced, so that the electric field intensity concentrated on the sharp edge is dispersed to the smooth annular surface of the first side equalizing ring 41 and the second side equalizing ring 42. This suppresses tip discharge and reduces the peak value of the electric field intensity on the equalizing circuit breaker, thereby enhancing the operational stability and safety of the equalizing circuit breaker.

[0046] It should be noted that when the first arc extinguishing unit 21 and the second arc extinguishing unit 22 perform the circuit breaker operation, the voltage between the first incoming conductor 211 and the first outgoing conductor 212 and the voltage between the second incoming conductor 221 and the second outgoing conductor 222 are also called the recovery voltage. The high-frequency transient current caused when the recovery voltage is formed passes through the first equalizing capacitor 31 and the second equalizing capacitor 32, so that the charge is redistributed between the first equalizing capacitor 31 and the second equalizing capacitor 32.

[0047] In such Figure 1 In the specific embodiment shown, the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22 are symmetrically arranged on both sides of the support column 10, thereby forming a T-shaped structure with the support column 10 and the first and second arc-extinguishing units 21 and 22. The first and second arc-extinguishing units 21 and 22 extend coaxially along a first axis, and the first and second voltage-equalizing capacitors 31 and 32 extend coaxially along a second axis, with the first and second axes being parallel. The support column 10, which forms the T-shaped structure, extends along a third axis, which is perpendicular to the first and second axes.

[0048] Specifically, the first arc-extinguishing unit 21, the second arc-extinguishing unit 22, the first voltage-equalizing capacitor 31, and the second voltage-equalizing capacitor 32 are all columnar. The support column 10 is located in the vertical part of the T-shaped structure, providing support, while the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22 are located in the horizontal part of the T-shaped structure, increasing the stability of the voltage-equalizing circuit breaker. That is to say, the first arc-extinguishing unit 21, the second arc-extinguishing unit 22, the first voltage-equalizing capacitor 31, and the second voltage-equalizing capacitor 32 are arranged in the same direction, but the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22 are on different axes from the first voltage-equalizing capacitor 31 and the second voltage-equalizing capacitor 32.

[0049] In such Figure 1 In the specific embodiment shown, the first equalizing capacitor 31 includes a first capacitor connection terminal 311 electrically connected to the first input conductor 211 and a second capacitor connection terminal 312 electrically connected to the first output conductor 212. The second equalizing capacitor 32 includes a third capacitor connection terminal 313 electrically connected to the second input conductor 221 and a fourth capacitor connection terminal 314 electrically connected to the second output conductor 222. The annular plane of the first side equalizing ring 41 is perpendicular to the first axis and the second axis. The first capacitor connection terminal 311 and the first input conductor 211 are on the annular plane of the first side equalizing ring 41 and located within the area enclosed by the annular tubular component of the first side equalizing ring 41. The annular plane of the second side equalizing ring 42 is perpendicular to the first axis and the second axis. The fourth capacitor connection terminal 314 and the second output conductor 222 are on the annular plane of the second side equalizing ring 42 and located within the area enclosed by the annular tubular component of the second side equalizing ring 42.

[0050] The above structural configuration enables the parallel connection of the first arc-extinguishing unit 21 and the first voltage-equalizing capacitor 31, as well as the parallel connection of the second arc-extinguishing unit 22 and the second voltage-equalizing capacitor 32.

[0051] Meanwhile, this application preferably designs the relationship between the first capacitor connection terminal 311 and the first input conductor 211 relative to the first side equalizing ring 41, that is, the first capacitor connection terminal 311 and the first input conductor 211 are on the annular plane of the first side equalizing ring 41 and located within the area enclosed by the annular tubular component of the first side equalizing ring 41. The first side equalizing ring 41, as a conductor, forms a smooth, equipotential surface with the same potential on its surface. The area enclosed by the annular tubular component of the first side equalizing ring 41 can cover the ends of all electrically connected components, that is, the equipotential surface of the first side equalizing ring 41 covers the first capacitor connection terminal 311 and the first input conductor 211, guiding and dispersing the electric field intensity distribution on the tips near the first capacitor connection terminal 311 and the first input conductor 211, avoiding excessive concentration of electric field intensity or tip discharge caused by the tips being exposed outside the area enclosed by the annular tubular component of the first side equalizing ring 41, thus improving the operational stability and safety of the equalizing circuit breaker.

[0052] Meanwhile, this application preferably designs the relationship between the fourth capacitor connection terminal 314 and the second outgoing conductor 222 and the second side equalizing ring 42, that is, the fourth capacitor connection terminal 314 and the second outgoing conductor 222 are on the annular plane of the second side equalizing ring 42 and located within the area enclosed by the annular tubular component of the second side equalizing ring 42. The second side equalizing ring 42, as a conductor, forms a smooth, equipotential surface with the same potential on its surface. The area enclosed by the annular tubular component of the second side equalizing ring 42 can cover the ends of all electrically connected components, that is, the equipotential surface of the second side equalizing ring 42 covers the fourth capacitor connection terminal 314 and the second outgoing conductor 222, guiding and dispersing the electric field intensity distribution on the tips near the fourth capacitor connection terminal 314 and the second outgoing conductor 222, avoiding excessive concentration of electric field intensity or tip discharge caused by the tips being exposed outside the area enclosed by the annular tubular component of the second side equalizing ring 42, thus improving the operational stability and safety of the equalizing circuit breaker.

[0053] It should be noted that the annular tubular component of the first side equalizing ring 41 has a central axis parallel to the first axis and the second axis, and perpendicular to the annular plane of the first side equalizing ring 41. The annular tubular component of the second side equalizing ring 42 has a central axis parallel to the first axis and the second axis, and perpendicular to the annular plane of the second side equalizing ring 42.

[0054] The annular region refers to the planar area enclosed by the surface of the first side equalizing ring 41 near the center of the annulus. The annular region of the second side equalizing ring 42 refers to the planar area enclosed by the surface of the second side equalizing ring 42 near the center of the annulus. It should be noted that the first axis extends from the first inlet conductor 211 to the second outlet conductor 222, and the second axis extends from the first capacitor connection terminal 311 to the fourth capacitor connection terminal 314.

[0055] In such Figure 1 In the specific embodiment shown, the length of the first equalizing capacitor 31 extending along the second axis is the first arc distance, and the length of the second equalizing capacitor 32 extending along the second axis is the second arc distance. The first arc distance and the second arc distance are the same and within the range of 2150mm to 2250mm. By reasonably setting the first and second arc distances, the flashover voltage of the equalizing circuit breaker in air can be effectively increased, making it more difficult for air to break down and ensuring that the equalizing circuit breaker can still operate safely and reliably under the worst conditions.

[0056] In such Figure 1 In the specific embodiment shown, the first side equalizing ring 41, which has an annular tubular component, and the second side equalizing ring 42, which also has an annular tubular component, have the same diameter, ranging from 115 mm to 125 mm. By appropriately setting the diameters of the first side equalizing ring 41 and the second side equalizing ring 42, the surface smoothness and surface area of ​​the two rings can be improved, which is beneficial for dispersing the electric field, reducing the peak value of the electric field intensity on the equalizing circuit breaker, and thus improving the ability of the equalizing circuit breaker to suppress tip discharge. Here, the pipe diameter refers to the shortest distance between the surfaces of the first side equalizing ring 41 and the second side equalizing ring 42 closest to the central axis of the annular tubular component and the surfaces furthest from the central axis of the annular tubular component.

[0057] Preferably, the first dry arc distance of the first equalizing capacitor 31 and the second dry arc distance of the second equalizing capacitor 32 are set to 2200mm, and the tube diameters of the first side equalizing ring 41 and the second side equalizing ring 42 are set to 120mm.

[0058] Optionally, the first side equalizing ring 41 and the second side equalizing ring 42 are hollow, annular tubular components made of metal. Preferably, in such a way... Figure 1 In the specific embodiment shown, the first side equalizing ring 41 and the second side equalizing ring 42 are configured as hollow rectangular rings.

[0059] In such Figure 1In the specific embodiment shown, the voltage equalization device includes a first inner surface connector 411 and a second inner surface connector 421. The first inner surface connector 411 supports the first side voltage equalization ring 41 and electrically connects the first side voltage equalization ring 41 to the first incoming conductor 211. The second inner surface connector 421 supports the second side voltage equalization ring 42 and electrically connects the second side voltage equalization ring 42 to the second outgoing conductor 222. In other words, the first inner surface connector 411 and the second inner surface connector 421, as supporting structures, respectively ensure the stability of the first side voltage equalization ring 41 and the second side voltage equalization ring 42 relative to the porcelain-column circuit breaker. Simultaneously, they ensure that the first side voltage equalization ring 41 directly contacts the first incoming conductor 211 to form a circuit, and the second side voltage equalization ring 42 directly contacts the second outgoing conductor 222 to form a circuit.

[0060] Specifically, the first inner surface connector 411 has a first plate and a second plate extending along an annular plane parallel to and perpendicular to the first side equalizing ring 41. The first plate traverses the area enclosed by the annular tubular component of the first side equalizing ring 41, and both ends of the first plate are fixedly connected to the annular surface of the first side equalizing ring 41. The two ends of the second plate are respectively fixedly connected to the first plate and the annular surface of the first side equalizing ring 41. In other words, the first inner surface connector 411 forms a "T-shaped" support for the first side equalizing ring 41 and establishes an electrical connection with it. The aforementioned "T-shape" includes the first plate traversing the area enclosed by the annular tubular component of the first side equalizing ring 41, and the second plate bridging between the first plate and the first side equalizing ring 41, forming a structure in which both ends of the first plate are fixedly connected to the annular surface of the first side equalizing ring 41, and both ends of the second plate are respectively fixedly connected to the first plate and the annular surface of the first side equalizing ring 41. This helps to disperse the stress borne by the annular surface of the first side equalizing ring 41 and improves its vibration resistance.

[0061] Specifically, the second inner surface connector 421 has a third plate and a fourth plate extending parallel to and perpendicularly intersecting the annular plane of the second side equalizing ring 42. The third plate traverses the area enclosed by the annular tubular component of the second side equalizing ring 42, with both ends of the third plate fixedly connected to the annular surface of the second side equalizing ring 42. The two ends of the fourth plate are respectively fixedly connected to the third plate and the annular surface of the second side equalizing ring 42. In other words, the second inner surface connector 421 forms a "T-shaped" support for the second side equalizing ring 42 and establishes an electrical connection with it. The aforementioned "T-shape" includes the third plate traversing the area enclosed by the annular tubular component of the second side equalizing ring 42, and the fourth plate bridging between the third plate and the second side equalizing ring 42. This structure, where both ends of the third plate are fixedly connected to the annular surface of the second side equalizing ring 42, and both ends of the fourth plate are respectively fixedly connected to the third plate and the annular surface of the second side equalizing ring 42, helps to disperse the stress borne by the annular surface of the second side equalizing ring 42 and improves its vibration resistance.

[0062] More specifically, the first inner surface connector 411 has multiple mounting holes, allowing for electrical connection between the first side equalizing ring 41 and the first inlet conductor 211 via bolts. The second inner surface connector 421 has multiple mounting holes, allowing for electrical connection between the second side equalizing ring 42 and the second outlet conductor 222 via bolts. Of course, the number of mounting holes on the first inner surface connector 411 and the second inner surface connector 421 can be adjusted according to actual needs.

[0063] In such Figure 1 In the specific embodiment shown, the voltage equalization device includes a first connector 51, a second connector 52, a third connector 53, and a fourth connector 54. The first connector 51 and the second connector 52 extend along an annular plane parallel to the first side voltage equalization ring 41 and are used to fixably connect the first arc-extinguishing unit 21 and the first voltage equalization capacitor 31. The third connector 53 and the fourth connector 54 extend along an annular plane parallel to the second side voltage equalization ring 42 and are used to fixably connect the second arc-extinguishing unit 22 and the second voltage equalization capacitor 32. That is, the first arc-extinguishing unit 21 and the first voltage equalization capacitor 31 are fixedly connected, and the second arc-extinguishing unit 22 and the second voltage equalization capacitor 32 are also fixedly connected. Meanwhile, the lengths of the first connector 51 and the second connector 52 extending along the annular plane parallel to the first side equalizing ring 41 are equal to the lengths of the third connector 53 and the fourth connector 54 extending along the annular plane parallel to the second side equalizing ring 42, so as to ensure that the first arc extinguishing unit 21 and the first equalizing capacitor 31 are arranged in parallel, and the second arc extinguishing unit 22 and the second equalizing capacitor 32 are arranged in parallel, so as to ensure that the overall force of the equalizing circuit breaker is balanced.

[0064] Specifically, the first capacitor connection terminal 311 is electrically connected to the first input conductor 211 via the first connector 51, the second capacitor connection terminal 312 is electrically connected to the first output conductor 212 via the second connector 52, the third capacitor connection terminal 313 is electrically connected to the second input conductor 221 via the third connector 53, and the fourth capacitor connection terminal 314 is electrically connected to the second output conductor 222 via the fourth connector 54. The voltage equalization device can eliminate the voltage difference between the first input conductor 211 and the first output conductor 212 and between the second input conductor 221 and the second output conductor 222.

[0065] More specifically, the end of the first connector 51 near the first equalizing capacitor 31 is bolted to the first capacitor connection terminal 311, the end of the first connector 51 near the first arc extinguishing unit 21 is bolted to the first input conductor 211, the end of the second connector 52 near the first equalizing capacitor 31 is bolted to the second capacitor connection terminal 312, the end of the second connector 52 near the first arc extinguishing unit 21 is bolted to the first output conductor 212, the end of the third connector 53 near the second equalizing capacitor 32 is bolted to the third capacitor connection terminal 313, the end of the third connector 53 near the second arc extinguishing unit 22 is bolted to the second input conductor 221, the end of the fourth connector 54 near the second equalizing capacitor 32 is bolted to the fourth capacitor connection terminal 314, and the end of the fourth connector 54 near the second arc extinguishing unit 22 is bolted to the second output conductor 222.

[0066] Optionally, the first connector 51 and the second connector 52 are connected at one end to the first arc-extinguishing unit 21 near the support column 10, and at the other end to the first equalizing capacitor 31 away from the support column 10. The third connector 53 and the fourth connector 54 are connected at one end to the second arc-extinguishing unit 22 near the support column 10, and at the other end to the second equalizing capacitor 32 away from the support column 10. This arrangement can effectively increase the distance between the first arc-extinguishing unit 21 and the first equalizing capacitor 31, and between the second arc-extinguishing unit 22 and the second equalizing capacitor 32, preventing voltage surges from causing insulation failure between the first arc-extinguishing unit 21 and the first equalizing capacitor 31, and between the second arc-extinguishing unit 22 and the second equalizing capacitor 32.

[0067] In such Figure 1In the specific embodiment shown, the porcelain-column circuit breaker includes a first terminal plate 61 and a second terminal plate 62. The first terminal plate 61 is bolted to the first incoming conductor 211 and electrically connected to the first incoming conductor 211 and the first connector 51. The second terminal plate 62 is bolted to the second outgoing conductor 222 and electrically connected to the second outgoing conductor 222 and the fourth connector 54. The first terminal plate 61 extends in a direction parallel to the annular plane of the first side equalizing ring 41, and the second terminal plate 62 extends in a direction parallel to the annular plane of the second side equalizing ring 42.

[0068] Specifically, the first incoming conductor 211, the first terminal block 61, and the first connector 51 are electrically connected; the first outgoing conductor 212 is electrically connected to the second connector 52; the second incoming conductor 221 is electrically connected to the third connector 53; and the second outgoing conductor 222, the second terminal block 62, and the fourth connector 54 are electrically connected.

[0069] More specifically, the first terminal plate 61 extends along the annular plane parallel to the first side equalizing ring 41 and is bolted to the first input conductor 211, and the second terminal plate 62 extends along the annular plane parallel to the second side equalizing ring 42 and is bolted to the second output conductor 222, ensuring that the power supply side conductor is directly connected to the first terminal plate 61 and the load side conductor is directly connected to the second terminal plate 62.

[0070] In such Figure 1 In the specific embodiment shown, the equalizing device includes a shielding ring 43, which is fixedly installed between the top mounting surface of the support column 10 and the first end 111 of the tee member 11. The shielding ring 43 is formed as an annular tubular component, and the diameter of the shielding ring 43 as an annular tubular component is in the range of 115 mm to 125 mm. The differences in components between the first arc-extinguishing unit 21, the second arc-extinguishing unit 22 and the support column 10 cause voltage differences, and there is also a parasitic voltage to ground on the support column 10. Under abnormal conditions such as operational overvoltage or lightning strikes, the electric field strength on the top mounting surface of the support column 10 increases. Since the shielding ring 43 is an annular tubular component with a smooth surface, and provides additional surface area compared to only installing a porcelain column circuit breaker, the electric field concentrated at the sharp edge is dispersed to the larger smooth surface of the shielding ring 43, thereby suppressing tip discharge.

[0071] Optionally, the diameter of the shielding ring 43 is in the range of 115 mm to 125 mm. Preferably, the diameter of the shielding ring 43 is set to 120 mm.

[0072] In such Figure 1In the specific embodiment shown, the voltage equalization device includes a third inner surface connector 431, which supports the shielding ring 43 and electrically connects the shielding ring 43 to the first end 111 of the tee member 11. In other words, the third inner surface connector 431 acts as a support structure, ensuring the stability of the shielding ring 43 relative to the porcelain-column circuit breaker. Simultaneously, it ensures that the shielding ring 43 and the first end 111 of the tee member 11 are in direct contact to form a circuit.

[0073] Specifically, the third inner surface connector 431 has a fifth plate and a sixth plate that intersect perpendicularly. The fifth plate runs through the area enclosed by the annular tubular component of the shielding ring 43. The two ends of the fifth plate are fixedly connected to the annular surface of the shielding ring 43, and the two ends of the sixth plate are fixedly connected to the fifth plate and the annular surface of the shielding ring 43, respectively.

[0074] In other words, the third inner surface connector 431 includes a fifth plate that runs through the area enclosed by the annular tubular component of the shielding ring 43, and a sixth plate that bridges the fifth plate and the shielding ring 43, forming a structure in which the two ends of the fifth plate are fixedly connected to the annular surface of the shielding ring 43, and the two ends of the sixth plate are respectively fixedly connected to the fifth plate and the annular surface of the shielding ring 43. This helps to disperse the stress borne by the annular surface of the shielding ring 43 and improve the vibration resistance.

[0075] More specifically, the third inner surface connector 431 has multiple mounting holes, which can be used to electrically connect the shielding ring 43 to the first end 111 of the tee member 11 by means of bolts. Of course, the number of mounting holes on the first inner surface connector 411 and the second inner surface connector 421 can be set according to the actual situation.

[0076] Of course, as long as the support and stable electrical transmission of the first side equalizing ring 41, the second side equalizing ring 42 and the shielding ring 43 can be achieved, the shapes of the first inner surface connector 411, the second inner surface connector 421 and the third inner surface connector 431 can be set to other shapes.

[0077] In some optional embodiments, the capacitance of the first equalizing capacitor 31 is equal to the capacitance of the second equalizing capacitor 32. The first equalizing capacitor 31 and the second equalizing capacitor 32 have the same capacitance value and store equal amounts of charge. This allows the first equalizing capacitor 31 and the second equalizing capacitor 32 to actively eliminate the voltage difference between the first incoming conductor 211 and the first outgoing conductor 212, and between the second incoming conductor 221 and the second outgoing conductor 222, during the tripping operation of the first arc-extinguishing unit 21 and the second circuit breaker, thereby improving the insulation performance and arc-extinguishing efficiency of the equalizing circuit breaker.

[0078] Optionally, the capacitance values ​​of the first equalizing capacitor 31 and the second equalizing capacitor 32 can be any value within the range of 1500pF to 2000pF, such as 1500pF, 1600pF, 1700pF, 1800pF, 1900pF, and 2000pF. The unit of capacitance value is farad (F), and the capacitance values ​​of the first equalizing capacitor 31 and the second equalizing capacitor 32 of this disclosure are within the range of picofarads (pF).

[0079] In some optional embodiments, the equalizing circuit breaker also includes insulators, which effectively isolate the internal live components from the external environment, preventing accidental electrical contact and current leakage. The insulators also provide support and protection for the aforementioned support post 10, first arc-extinguishing unit 21, second arc-extinguishing unit 22, first equalizing capacitor 31, and second equalizing capacitor 32, preventing damage caused by severe weather. Preferably, the insulators are made of high-voltage porcelain, with a rated voltage of 1kV to 100kV, capable of withstanding long-term electrical stress and harsh natural environments.

[0080] In some optional embodiments, the voltage equalization circuit breaker of this disclosure is suitable for areas with altitudes ranging from 100m to 2500m, i.e., altitudes including 100m, 500m, 1000m, 1200m, 1500m, 1600m, 1700m, 1800m, 2000m, 2300m, 2500m, and any area between 100m and 2500m, to ensure the stability of the voltage equalization circuit breaker and thus meet the operational requirements of high-voltage electrical equipment under harsh conditions. Simultaneously, the voltage equalization circuit breaker of this disclosure can accommodate reasonable climate changes in the aforementioned areas, such as different temperature, humidity, and other weather conditions.

[0081] It should be noted that the porcelain column circuit breaker of this disclosure is used to control the breaking of the connection between the power supply side conductor and the load side conductor. The first arc-extinguishing unit 21 and the second arc-extinguishing unit 22 can be opened or closed according to actual needs, thereby ensuring the stable operation of the high-voltage circuit. Specifically, the internal components of the porcelain column circuit breaker use a sulfur hexafluoride circuit breaker (i.e., an SF6 circuit breaker), and the system voltage applicable to the porcelain column circuit breaker of this disclosure is 550kV.

[0082] In addition, the porcelain column circuit breaker disclosed herein also includes a control cabinet (not shown) and an operating mechanism box (not shown). The control cabinet is electrically connected to the operating mechanism box via a cable. The control cabinet transmits commands to the operating mechanism box, which then transmits them to the tee member 11 via the transmission rod inside the drive column 10, thereby driving the first arc extinguishing unit 21 and the second arc extinguishing unit 22 to open or close.

[0083] In addition, refer to Figures 3 to 11The simulation diagram of the electric field strength is shown. The simulation conditions for the three-dimensional electrostatic field analysis of the equalizing circuit breaker disclosed in this invention are as follows: the system voltage of the simulated high-voltage circuit is set to 550kV, the AC frequency is 50Hz, and the rated short-time power frequency withstand voltage value of the equalizing circuit breaker disclosed in this invention is set to 740kV + 318kV. Meeting the above rated short-time power frequency withstand voltage value allows the equalizing circuit breaker disclosed in this invention to be used in areas with an altitude not exceeding 2500m. The simulated equalizing circuit breaker has an achievable electrical connection circuit. Specifically, when the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22 are in the closed state, the first terminal plate 61 of the equalizing circuit breaker is electrically connected to the power supply side conductor, and the second terminal plate 62 is electrically connected to the load side conductor. The equalizing circuit breaker carries AC current. The first terminal plate 61 is electrically connected to the first incoming conductor 211, and the second terminal plate 62 is electrically connected to the second outgoing conductor 222. This enables the first arc-extinguishing unit 21 to be connected in parallel with the first equalizing capacitor 31 through the first incoming conductor 211 and the first outgoing conductor 212. The second arc-extinguishing unit 22 is connected in parallel with the second equalizing capacitor 32 through the second incoming conductor 221 and the second outgoing conductor 222. The first arc-extinguishing unit 21 is connected in series with the first side equalizing ring 41 through the first incoming conductor 211, and the second arc-extinguishing unit 22 is connected in series with the second side equalizing ring 42 through the second outgoing conductor 222.

[0084] At this time, when the operator simulates the opening operation of the first arc-extinguishing unit 21 and the second arc-extinguishing unit 22, the first equalizing capacitor 31 and the second equalizing capacitor 32 actively distribute the voltage, so that the voltage difference between the first incoming conductor 211 and the first outgoing conductor 212 and the voltage difference between the second incoming conductor 221 and the second outgoing conductor 222 disappears. The first side equalizing ring 41 and the second side equalizing ring 42 are electrically connected to the porcelain column circuit breaker so that the concentrated electric field at the tip is dispersed on the annular surface of the first side equalizing ring 41 and the second side equalizing ring 42.

[0085] This disclosure performs electric field intensity simulations sequentially at the first equalizing capacitor 31, the first terminal plate 61, and the first side equalizing ring 41 under the maximum phase voltage. Figures 3 to 5 The simulation diagram of the electric field intensity of Example 1 is shown. Figures 6 to 8 The simulation diagram of the electric field intensity of Example 2 is shown. Figures 9 to 11 A simulation diagram of the electric field strength of Embodiment 3 is shown. Of course, in the above examples, the first arc extinguishing unit 21 and the second arc extinguishing unit 22, the first voltage equalizing capacitor 31 and the second voltage equalizing capacitor 32, the first terminal plate 61 and the second terminal plate 62, and the first side voltage equalizing ring 41 and the second side voltage equalizing ring 42 are symmetrically arranged. This disclosure only uses the first voltage equalizing capacitor 31, the first terminal plate 61, and the first side voltage equalizing ring 41 as examples for analysis.

[0086] It should be noted that, Figures 3 to 11 The structure shown is a three-dimensional schematic. For example, Figures 3 to 11 As shown, the position of the tee member 11 is simplified to the origin o. The axial direction of the first arc-extinguishing unit 21 is set as the x-axis, the direction of the line connecting the support column 10 and the tee member 11 is set as the y-axis, and the direction perpendicular to the x-axis and y-axis is set as the z-axis. The x-axis, y-axis, and z-axis pass through the origin o. The viewing angle of the above three-dimensional schematic structure is different.

[0087] In the above examples, the electric field intensity simulation diagrams have legends. Different colors in the legends represent different electric field intensity values ​​distributed on the equalizing circuit breaker. For example, the electric field intensity value represented by blue in the legend is less than that represented by red in the legend. The gradient colors from blue to red in the legend also have the meaning of electric field intensity values. The two data points on the right side of each color box in the legend represent the range of electric field intensity represented by that color. The unit of electric field intensity value is kilovolts per millimeter (kV / mm).

[0088] It should be noted that in the electric field intensity simulation graphs of the above examples, the maximum electric field intensity is marked on the graph in the form of a label consisting of a white circle and a red arrow. The white dot and the red arrow are surrounded by a black line. The location of the white dot indicates the location with the maximum electric field intensity. The red arrow and the word "MAX" in it indicate that the electric field intensity is the maximum at the white dot. However, the colors of the labels, coordinate axes, coordinate axis letters, background color of the electric field intensity simulation graph, or black lines do not indicate the meaning of electric field intensity.

[0089] In Example 1, see Figures 3 to 5 The equalizing circuit breaker has a first dry arc distance of 2200mm, and the first side equalizing ring 41 has a single-ring structure and a pipe diameter of 120mm. (See also...) Figure 3 The maximum electric field strength at the first equalizing capacitor 31 reaches 1.4 kV / mm. This maximum electric field strength is located on the first equalizing capacitor 31 near the end of the first side equalizing ring 41. (See reference...) Figure 4 The maximum electric field strength at the first terminal plate 61 reaches 1.7 kV / mm, and this maximum electric field strength is located on the end plate of the first terminal plate 61. (See also...) Figure 5 The maximum electric field strength at the first side equalizing ring 41 is only 2.2 kV / mm, and this maximum electric field strength is located on the surface of the first side equalizing ring 41 away from the central axis of its annular tubular component. Under the maximum phase voltage, the electric field strength on the equalizing circuit breaker of Embodiment 1 conforms to the allowable electric field strength of 2.2 kV / mm.

[0090] In Example 2, see Figures 6 to 8The equalizing circuit breaker has a first dry arc distance of 2100mm, and the first side equalizing ring 41 has a single-ring structure and a pipe diameter of 82mm. (See also...) Figure 6 The maximum electric field strength at the first equalizing capacitor 31 can reach 2.5 kV / mm. This maximum electric field strength is located on the first equalizing capacitor 31 near the end of the first side equalizing ring 41. (See reference...) Figure 7 The maximum electric field strength at the first terminal plate 61 can reach 2.1 kV / mm, and the maximum electric field strength at the first terminal plate 61 is located on the end plate of the first terminal plate 61. (See also...) Figure 8 The maximum electric field strength at the first side equalizing ring 41 can reach 2.7kV / mm. The maximum electric field strength at the first side equalizing ring 41 is located on the surface of the first side equalizing ring 41 away from the central axis of its annular tubular component.

[0091] In Example 3, see Figures 9 to 11 The equalizing circuit breaker has a first dry arc distance of 2200mm, and the first side equalizing ring 41 has a double-ring structure and a pipe diameter of 76mm. (See also...) Figure 9 The maximum electric field strength at the first equalizing capacitor 31 is reduced compared to the maximum electric field strength at the first equalizing capacitor 31 in Embodiment 2, reaching 1.4 kV / mm. The maximum electric field strength at the first equalizing capacitor 31 is located at the end of the first equalizing capacitor 31 near the first side equalizing ring 41. (See also...) Figure 10 The maximum electric field strength at the first terminal plate 61 is also reduced compared to the maximum electric field strength at the first terminal plate 61 in Embodiment 2, reaching 1.7 kV / mm. The maximum electric field strength at the first terminal plate 61 is located on the end plate of the first terminal plate 61. The difference from Embodiments 1 and 2 is that the first side equalizing ring 41 in Embodiment 3 has a first annular tubular structure and a second annular tubular structure that are identical in shape and spaced apart. The diameter of both the first and second annular tubular structures is 76 mm. Embodiment 3 also includes a fourth inner surface connector (not shown). The first annular tubular structure is positioned closer to the first arc-extinguishing unit 21 than the second annular tubular structure. The first annular tubular structure is fixedly connected to the first inner surface connector 411, and the first annular tubular structure is fixedly connected to the fourth inner surface connector. The first inner surface connector 411 and the fourth inner surface connector are fixedly connected through mounting holes and bolts. (See reference...) Figure 11 The maximum electric field strength at the first side equalizing ring 41 reaches 2.4kV / mm. The maximum electric field strength at the first side equalizing ring 41 is located on the surface of the first annular tubular structure away from the central axis of its annular tubular component.

[0092] The equalizing circuit breaker disclosed herein meets a rated short-time power frequency withstand voltage of 740kV + 318kV. 740kV is the rated short-time power frequency withstand voltage of the equalizing circuit breaker, and 318kV is the additional voltage difference that the equalizing circuit breaker of this disclosure can withstand beyond the rated short-time power frequency withstand voltage. Furthermore, the equalizing circuit breaker of this disclosure meets insulation requirements with a rated lightning impulse withstand voltage of 1675kV + 450kV and a rated switching impulse withstand voltage of 1175kV + 450kV.

[0093] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A pressure equalizing circuit breaker characterized by, The voltage equalization circuit breaker includes a porcelain column circuit breaker and a voltage equalization device. The porcelain column circuit breaker includes a first arc-extinguishing unit (21), a second arc-extinguishing unit (22), a support column (10), and a tee (11), wherein: The first arc extinguishing unit (21) includes a first inlet conductor (211) connected to the power supply side wire and a first outlet conductor (212) connected to the second end (112) of the tee (11). The second arc extinguishing unit (22) includes a second inlet conductor (221) connected to the third end (113) of the tee (11) and a second outlet conductor (222) connected to the load side conductor. The support column (10) includes a top mounting surface connected to the first end (111) of the tee (11), and the support column (10) supports the tee (11) and the first arc extinguishing unit (21) and the second arc extinguishing unit (22) connected to the tee (11). The second end (112) of the three-way connector (11) is electrically connected to the third end (113) of the three-way connector (11), thereby connecting the first arc-extinguishing unit (21) and the second arc-extinguishing unit (22) in series between the power supply side conductor and the load side conductor; The voltage equalization device includes a first voltage equalization capacitor (31), a second voltage equalization capacitor (32), a first side voltage equalization ring (41), and a second side voltage equalization ring (42), wherein: The first equalizing capacitor (31) and the first arc extinguishing unit (21) are connected in parallel between the power supply side wire and the second end (112) of the three-way connector (11); The second equalizing capacitor (32) and the second arc extinguishing unit (22) are connected in parallel between the third end (113) of the three-way connector (11) and the load-side conductor; The first side equalizing ring (41) is formed as having an annular tubular component, and the first side equalizing ring (41) is electrically connected to the first inlet conductor (211) of the first arc extinguishing unit (21). The second side equalizing ring (42) is formed as having an annular tubular component, and the second side equalizing ring (42) is electrically connected to the second outgoing conductor (222) of the second arc extinguishing unit (22); The first equalizing capacitor (31) and the second equalizing capacitor (32) are used to absorb or release charge during the opening operation of the first arc-extinguishing unit (21) and the second arc-extinguishing unit (22) to make the voltage between the first input conductor (211) and the first output conductor (212) equal to the voltage between the second input conductor (221) and the second output conductor (222); and The first side equalizing ring (41) and the second side equalizing ring (42) are electrically connected to the porcelain column circuit breaker. The first side equalizing ring (41) and the second side equalizing ring (42) provide additional surface area so that the charge on the porcelain column circuit breaker is distributed on the annular surface of the first side equalizing ring (41) and the second side equalizing ring (42).

2. The equalizing circuit breaker according to claim 1, characterized in that The first arc-extinguishing unit (21) and the second arc-extinguishing unit (22) are symmetrically arranged on both sides of the support column (10), thereby forming a T-shaped structure with the support column (10) and the first arc-extinguishing unit (21) and the second arc-extinguishing unit (22); The first arc-extinguishing unit (21) and the second arc-extinguishing unit (22) extend coaxially along the first axis, and the first voltage equalizing capacitor (31) and the second voltage equalizing capacitor (32) extend coaxially along the second axis, with the first axis and the second axis being parallel. The support column (10) that makes up the T-shaped structure extends along a third axis, which is perpendicular to the first axis and the second axis.

3. The equalizing circuit breaker according to claim 2, characterized in that: The first equalizing capacitor (31) includes a first capacitor connection terminal (311) electrically connected to the first input terminal conductor (211) and a second capacitor connection terminal (312) electrically connected to the first output terminal conductor (212). The second equalizing capacitor (32) includes a third capacitor connection terminal (313) electrically connected to the second input terminal conductor (221) and a fourth capacitor connection terminal (314) electrically connected to the second output terminal conductor (222). The annular plane of the first side equalizing ring (41) is perpendicular to the first axis and the second axis; the first capacitor connection end (311) and the first input conductor (211) are on the annular plane of the first side equalizing ring (41) and are located in the area enclosed by the annular tubular component of the first side equalizing ring (41); The annular plane of the second side equalizing ring (42) is perpendicular to the first axis and the second axis; the fourth capacitor connection end (314) and the second output end conductor (222) are on the annular plane of the second side equalizing ring (42) and are located in the area enclosed by the annular tubular component of the second side equalizing ring (42).

4. The equalizing circuit breaker according to claim 2, characterized in that, The length of the first equalizing capacitor (31) extending along the second axis is the first dry arc distance, and the length of the second equalizing capacitor (32) extending along the second axis is the second dry arc distance. The first dry arc distance and the second dry arc distance are the same and are in the range of 2150mm to 2250mm.

5. The equalizing circuit breaker according to claim 1, characterized in that, The first side equalizing ring (41), which has an annular tubular component, has the same diameter as the second side equalizing ring (42), which also has an annular tubular component, and is in the range of 115 mm to 125 mm.

6. The equalizing circuit breaker according to claim 1, characterized in that, The pressure equalization device includes a first inner surface connector (411) and a second inner surface connector (421), wherein: The first inner surface connector (411) supports the first side equalizing ring (41) and electrically connects the first side equalizing ring (41) to the first inlet conductor (211); The second inner surface connector (421) supports the second side equalizing ring (42) and electrically connects the second side equalizing ring (42) to the second outgoing conductor (222).

7. The equalizing circuit breaker according to claim 6, characterized in that, The first inner surface connector (411) has a first plate and a second plate extending along an annular plane parallel to the first side equalizing ring (41) and intersecting perpendicularly. The first plate traverses the area enclosed by the annular tubular component of the first side equalizing ring (41). The two ends of the first plate are fixedly connected to the annular surface of the first side equalizing ring (41), and the two ends of the second plate are fixedly connected to the first plate and the annular surface of the first side equalizing ring (41), respectively. The second inner surface connector (421) has a third plate and a fourth plate extending along an annular plane parallel to the second side equalizing ring (42) and intersecting perpendicularly. The third plate traverses the area enclosed by the annular tubular component of the second side equalizing ring (42). The two ends of the third plate are fixedly connected to the annular surface of the second side equalizing ring (42), and the two ends of the fourth plate are fixedly connected to the third plate and the annular surface of the second side equalizing ring (42), respectively.

8. The equalizing circuit breaker according to claim 3, characterized in that, The pressure equalization device includes a first connector (51), a second connector (52), a third connector (53), and a fourth connector (54), wherein: The first connector (51) and the second connector (52) extend along an annular plane parallel to the first side equalizing ring (41) and are used to fix the first arc extinguishing unit (21) and the first equalizing capacitor (31). The third connector (53) and the fourth connector (54) extend along an annular plane parallel to the second side equalizing ring (42) and are used to fix the second arc extinguishing unit (22) and the second equalizing capacitor (32). The first capacitor connection terminal (311) is electrically connected to the first input terminal conductor (211) via the first connector (51); The second capacitor connection terminal (312) is electrically connected to the first output terminal conductor (212) via the second connector (52); The third capacitor connection terminal (313) is electrically connected to the second input conductor (221) via the third connector (53); The fourth capacitor connection terminal (314) is electrically connected to the second output terminal conductor (222) via the fourth connector (54).

9. The voltage equalization circuit breaker according to claim 8, characterized in that, The porcelain column circuit breaker includes a first terminal block (61) and a second terminal block (62), wherein: The first terminal block (61) is bolted to the first inlet conductor (211) and electrically connected to the first inlet conductor (211) and the first connector (51); The second terminal block (62) is bolted to the second outgoing conductor (222) and electrically connected to the second outgoing conductor (222) and the fourth connector (54); The first terminal plate (61) extends along a direction parallel to the annular plane of the first side equalizing ring (41), and the second terminal plate (62) extends along a direction parallel to the annular plane of the second side equalizing ring (42).

10. The equalizing circuit breaker of claim 1, wherein, The equalizing device includes a shielding ring (43), which is fixedly installed between the top mounting surface of the support column (10) and the first end (111) of the tee (11). The shielding ring (43) is formed as having an annular tubular component, and the diameter of the shielding ring (43) having an annular tubular component is in the range of 115 mm to 125 mm.

11. The equalizing circuit breaker according to claim 10, characterized in that, The equalizing device includes a third inner surface connector (431), which supports the shielding ring (43) and electrically connects the shielding ring (43) to the first end (111) of the tee (11).

12. The equalizing circuit breaker according to claim 11, characterized in that, The third inner surface connector (431) has a fifth plate and a sixth plate that intersect perpendicularly. The fifth plate runs through the area enclosed by the annular tubular component of the shielding ring (43). The two ends of the fifth plate are fixedly connected to the annular surface of the shielding ring (43). The two ends of the sixth plate are fixedly connected to the fifth plate and the annular surface of the shielding ring (43), respectively.

13. The equalizing circuit breaker according to any one of claims 1 to 12, characterized in that, The capacitance of the first equalizing capacitor (31) is equal to the capacitance of the second equalizing capacitor (32).

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