A pole mounted circuit breaker

Abstract

The present invention relates to the technical field of circuit breakers, and in particular to a pole-mounted circuit breaker, comprising: a vacuum interrupter; a contact device; an isolating switch; a detection unit detects magnetic field data at several positions in the vacuum interrupter at several time points when the switch is opened, and detects current data passing through the current transformer when the switch is closed; a control unit determines the direction of magnetic field divergence and the rate of change of magnetic field intensity according to the magnetic field data, determines the arc diffusion form at several time points according to the rate of change of magnetic field intensity and the direction of magnetic field divergence, determines the arc deionization rate according to the arc diffusion form, and adjusts the magnetic field intensity and / or the direction of magnetic field divergence according to the arc deionization rate to promote arc dissipation; an operating unit determines the time of opening the switch according to the current data, and adjusts the opening speed according to the arc deionization rate. The present invention effectively increases the range of arc diffusion, adjusts the opening speed, promotes arc energy dispersion, and enhances arc extinguishing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a pole-mounted circuit breaker. Background Art

[0002] With the rapid development of my country's economy and the continuous increase in power supply, various types of customers are increasingly dependent on electricity. In order to improve the power supply reliability of the power grid, pole-mounted circuit breakers are widely used in the connection, segmentation and branch lines of the power grid. These pole-mounted circuit breakers play an important protective role in the power grid. They can quickly cut off the current when a fault occurs, prevent the fault from expanding, and thus ensure the safe and stable operation of the power grid.

[0003] During the operation of the pole-mounted circuit breaker, the arc diffusion morphology when the contacts are opened is a key factor. However, the problem of uneven arc diffusion is common in the prior art. This is mainly due to the combined influence of multiple factors such as contact structure, magnetic field distribution and opening speed. The uneven arc diffusion not only affects the arc extinguishing performance of the circuit breaker, but may also cause equipment damage and power grid failure.

[0004] Therefore, there is an urgent need for a pole-mounted circuit breaker that can solve the problem of uneven arc diffusion when contacts are opened, which can effectively increase the range of arc diffusion, promote arc energy dispersion, and enhance arc extinguishing effect. Summary of the invention

[0005] To this end, the present invention provides a pole-mounted circuit breaker to overcome the problem of uneven arc diffusion when contacts of the pole-mounted circuit breaker are opened in the prior art.

[0006] To achieve the above object, on one hand, the present invention provides a pole-mounted circuit breaker, comprising:

[0007] A vacuum interrupter chamber, the outer surface of which is provided with an insulating sleeve for electrically isolating the vacuum interrupter chamber from the external environment;

[0008] A contact device, comprising a moving contact and a stationary contact symmetrically arranged in the vacuum interrupter chamber;

[0009] Isolating switch, used to isolate the power supply to ensure the safety of maintenance work;

[0010] A detection unit, used to detect magnetic field data of several positions of the vacuum interrupter when the moving contact and the static contact are opened at several time points, and to detect current data passing through the current transformer during the closing process;

[0011] a control unit connected to the detection unit, for determining a magnetic field divergence direction and a magnetic field intensity change rate according to the magnetic field data, determining arc diffusion forms at a plurality of time points according to the magnetic field intensity change rate and the magnetic field divergence direction, determining an arc deionization change rate according to the arc diffusion form, and adjusting the magnetic field intensity and / or magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation;

[0012] The operating unit is connected to the detection unit and is used to control the switching action of the moving contact and the static contact, the switching action including opening and closing, determining the opening timing according to the current data, and opening based on the opening timing, and adjusting the opening speed according to the arc deionization change rate.

[0013] Furthermore, several magnetic field directions at several time points are determined based on the magnetic field data, and changes in magnetic field intensity in a single magnetic field direction are determined respectively, and whether the magnetic field diffuses toward the single magnetic field direction is determined based on the changes in magnetic field intensity.

[0014] Furthermore, the magnetic field strength in a single magnetic field direction is determined according to the magnetic field data at a plurality of time points, and the magnetic field strength change rate is determined according to the magnetic field strength at adjacent time points.

[0015] Furthermore, if the magnetic field strength change rate is greater than or equal to a preset magnetic field strength change rate and the magnetic field diffuses in a single magnetic field direction, the single magnetic field direction is determined to be the arc diffusion direction, and an arc diffusion morphology is constructed based on several arc diffusion directions.

[0016] Furthermore, the control unit determines the area of ​​the arc diffusion morphology at adjacent time points based on the arc diffusion morphology at several time points, and determines the current data at adjacent time points, and determines the arc deionization change rate at adjacent time points according to the area and the current data at adjacent time points.

[0017] Furthermore, it also includes a magnetic field generator, which is connected to the control unit and is used to adjust the magnetic field strength and / or magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation.

[0018] Furthermore, if the arc deionization change rate is less than a preset deionization change rate, the current passing through the magnetic field generator is increased to increase the magnetic field strength and / or the installation position of the magnetic field generator is adjusted to change the magnetic field divergence direction to promote arc dissipation.

[0019] Furthermore, the operating unit determines the current overload state according to the current data, and determines the opening timing according to the comparison result of the duration of the current overload state and the preset overload protection time;

[0020] The current overload state is that the current data is greater than or equal to the preset rated current.

[0021] Furthermore, if the duration is greater than or equal to a preset overload protection time, the moving contact and the static contact are opened.

[0022] Furthermore, the operating unit adjusts the opening speed according to the arc deionization change rate, including:

[0023] If the arc deionization change rate is less than the preset deionization change rate, the opening speed is accelerated;

[0024] If the arc deionization change rate is greater than or equal to the preset deionization change rate, the opening speed is maintained.

[0025] Compared with the prior art, the beneficial effect of the present invention lies in that the magnetic field data of several positions in the vacuum arc extinguishing chamber during the opening process are detected by the detection unit, and the magnetic field divergence direction and the rate of change of the magnetic field strength are determined by the control unit, so as to determine the arc diffusion form during opening, and the arc deionization rate of change are determined, and then the magnetic field strength and / or the magnetic field divergence direction are adjusted to promote arc dissipation. At the same time, the opening speed is adjusted according to the arc deionization rate of change during the opening process, which significantly improves the intelligence level of the pole-mounted circuit breaker, effectively increases the range of arc diffusion, optimizes the arc dissipation process, improves the accuracy of opening, and reduces the damage of the arc to the equipment.

[0026] Furthermore, the present invention accurately measures magnetic field data at different time points, and respectively determines the magnetic field intensity change rate and magnetic field diffusion direction in each magnetic field direction, and constructs an arc diffusion morphology according to the magnetic field intensities in multiple arc diffusion directions, which intuitively displays the diffusion of the arc, helps to further analyze the law of arc diffusion, thereby promoting further enhancement of the arc extinguishing effect, increasing the arc diffusion range, promoting arc energy dispersion, and reducing arc damage to pole-mounted circuit breaker components.

[0027] Furthermore, the present invention is provided with a magnetic field generator, which adjusts the magnetic field strength and / or the magnetic field divergence direction according to the arc deionization change rate to achieve precise control of the arc dissipation process, increase the arc dissipation rate, thereby further enhancing the arc extinguishing effect, increasing the arc diffusion range, promoting arc energy dispersion, reducing arc damage to pole-mounted circuit breaker components, and improving the integrity and reliability of the pole-mounted circuit breaker.

[0028] Furthermore, the present invention monitors the current data passing through the current transformer in real time and intelligently determines the current overload state and its duration to trigger the tripping operation, thereby effectively preventing the pole-mounted circuit breaker from being damaged due to long-term overload, thereby further enhancing the arc extinguishing effect, increasing the arc diffusion range, promoting the dispersion of arc energy, reducing the damage of the arc to the components of the pole-mounted circuit breaker, and improving the integrity and reliability of the pole-mounted circuit breaker.

[0029] Furthermore, the present invention adjusts the opening speed based on the arc deionization change rate, optimizes the pole-mounted circuit breaker opening process, thereby further effectively increasing the range of arc diffusion, promoting arc energy dispersion, enhancing arc extinguishing effect, reducing arc damage to pole-mounted circuit breaker components, and improving the overall performance and reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural connection block diagram of the pole mounted circuit breaker of the present invention;

[0031] Figure 2 A control flow chart of a control unit of a pole mounted circuit breaker of the present invention;

[0032] Figure 3 A control flow chart of an operating unit of a pole-mounted circuit breaker according to an embodiment of the present invention;

[0033] Figure 4 A flow chart for determining the arc deionization change rate according to an embodiment of the present invention;

[0034] Figure 5 The present invention is a flowchart of determining the time of opening the circuit breaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0037] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the unit or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0038] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figure 1 to Figure 3 As shown, Figure 1 It is a structural connection block diagram of the pole mounted circuit breaker of the present invention; Figure 2 A control flow chart of a control unit of a pole mounted circuit breaker of the present invention; Figure 3 The control flow chart of the operating unit of the pole-mounted circuit breaker according to the embodiment of the present invention is as follows. Specifically, the present invention provides a pole-mounted circuit breaker, including:

[0040] A vacuum interrupter chamber, the outer surface of which is provided with an insulating sleeve for electrically isolating the vacuum interrupter chamber from the external environment;

[0041] A contact device, comprising a moving contact and a stationary contact symmetrically arranged in the vacuum interrupter chamber;

[0042] Isolating switch, used to isolate the power supply to ensure the safety of maintenance work;

[0043] A detection unit, used to detect magnetic field data of several positions of the vacuum interrupter when the moving contact and the static contact are opened at several time points, and to detect current data passing through the current transformer during the closing process;

[0044] a control unit connected to the detection unit, for determining a magnetic field divergence direction and a magnetic field intensity change rate according to the magnetic field data, determining arc diffusion forms at a plurality of time points according to the magnetic field intensity change rate and the magnetic field divergence direction, determining an arc deionization change rate according to the arc diffusion form, and adjusting the magnetic field intensity and / or magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation;

[0045] The operating unit is connected to the detection unit and is used to control the switching action of the moving contact and the static contact, the switching action including opening and closing, determining the opening timing according to the current data, and opening based on the opening timing, and adjusting the opening speed according to the arc deionization change rate.

[0046] It is understandable that deionization is the key process of arc extinction, which corresponds to the ionization (arc generation) process. When the deionization effect in the arc is greater than the ionization effect, the arc will gradually weaken and eventually extinguish. The arc deionization rate directly affects the arc extinction speed and the circuit breaker's tripping performance. Therefore, the magnetic field strength and / or magnetic field divergence direction are adjusted according to the arc deionization rate to promote arc dissipation.

[0047] It can be understood that the present invention ensures electrical isolation by arranging an insulating sleeve outside the vacuum arc extinguishing chamber, and configures moving contacts and static contacts inside to realize the on and off of the circuit. It also includes an isolating switch to ensure maintenance safety. The detection unit monitors the magnetic field and current data in the opening and closing process in real time. The control unit uses these data to accurately determine the arc deionization change rate and dynamically adjusts the magnetic field parameters to optimize the arc dissipation process. The operating unit intelligently controls the opening and closing speed of the moving contact according to the current and arc dissipation conditions.

[0048] In implementation, the several time points can be determined according to the design parameters and installation environment of the pole-mounted circuit breaker. The value range of the several time points can be the time point after the opening time of the pole-mounted circuit breaker is divided into several parts, and the timestamps corresponding to the several parts are the time points. No specific limitation is made here. The several positions can be set around the contact of the moving contact, around the contact of the static contact, the outer surface and the inner wall of the vacuum interrupter. No specific limitation is made here. As long as it is possible to detect the magnetic field data of several positions of the vacuum interrupter when the moving contact and the static contact are opened at several time points, it will not be repeated here.

[0049] The present invention detects magnetic field data of several positions of the vacuum interrupter during the opening process through a detection unit, determines the magnetic field divergence direction and the rate of change of the magnetic field strength through a control unit, thereby determining the arc diffusion form during opening, and determining the arc deionization rate, and then adjusting the magnetic field strength and / or the magnetic field divergence direction to promote arc dissipation, and at the same time, adjusting the opening speed according to the arc deionization rate during the opening process, thereby significantly improving the intelligence level of the pole-mounted circuit breaker, effectively increasing the range of arc diffusion, optimizing the arc dissipation process, improving the accuracy of opening, and reducing the damage of the arc to the equipment.

[0050] Specifically, several magnetic field directions at several time points are determined based on the magnetic field data, the change of magnetic field intensity in a single magnetic field direction is determined respectively, and whether the magnetic field diffuses toward the single magnetic field direction is determined based on the change of magnetic field intensity.

[0051] It is understandable that when the pole-mounted circuit breaker is opened, a longitudinal magnetic field will be generated between the moving contact and the static contact, which will affect the diffusion movement of the arc, change the arc diffusion shape, and expand the range of the magnetic field generated by the arc to spread outward, and the magnetic field changes will be gradually detected inside and outside the vacuum interrupter. Therefore, there will be several magnetic field directions, and the changes in the magnetic field strength in several magnetic field directions are different.

[0052] In a specific embodiment, the magnetic field data of several positions at several time points are in the form of magnetic field intensity vectors, so the calculation formula for the magnetic field intensity at the mth position is the arithmetic square root of the sum of the square of the magnetic field intensity component of the magnetic field intensity at the mth position in the x-axis direction, the square of the magnetic field intensity component of the magnetic field intensity at the mth position in the y-axis direction, and the square of the magnetic field intensity component of the magnetic field intensity at the mth position in the z-axis direction.

[0053] It can be understood that to determine whether the magnetic field is diffusing in the direction of the single magnetic field, it is possible to observe whether there is an increasing trend in the components of each axis at several time points, and to determine the change in magnetic field intensity by comparing the changes in each magnetic field component at several positions at adjacent time points, thereby determining whether the magnetic field is diffusing in the direction of the single magnetic field.

[0054] Specifically, the magnetic field strength in a single magnetic field direction is determined according to the magnetic field data at a plurality of time points, and the magnetic field strength change rate is determined according to the magnetic field strength at adjacent time points.

[0055] It is understandable that at a certain time point, the magnetic field strength in the direction of magnetic field divergence can be measured by magnetic field data, and then by comparing the magnetic field strength in the same magnetic field divergence direction at adjacent time points, the magnetic field strength change rate in each magnetic field divergence direction can be determined. time point and The time between The rate of change of magnetic field intensity in the direction of magnetic field divergence is Time point The magnetic field strength and Time point The difference in magnetic field strength between Time point and Time point The ratio of the difference.

[0056] Specifically, if the magnetic field strength change rate is greater than or equal to the preset magnetic field strength change rate and the magnetic field diffuses in a single magnetic field direction, the single magnetic field direction is determined to be the arc diffusion direction, and an arc diffusion morphology is constructed based on several arc diffusion directions.

[0057] It can be understood that at different time points, if the rate of change of the magnetic field intensity in a certain direction is greater than or equal to the preset threshold value of the rate of change of the magnetic field intensity, and the magnetic field in this direction is judged to be spreading (that is, the magnetic field intensity not only increases, but also its influence range is expanding), then this direction is determined as the arc diffusion direction. By comparing the relative size of the magnetic field intensity in different arc diffusion directions, the arc diffusion pattern of the arc in space can be constructed. The arc diffusion pattern can reflect the main direction of the arc diffusion and the diffusion intensity of the arc in different directions. For example, the arc diffusion pattern can be defined as a polygon, the different arc diffusion directions are the corner points of the polygon, and the magnetic field intensity in different arc diffusion directions is the length from the center of the polygon to each corner point, so that the arc diffusion pattern of the polygon shape at different time points can be constructed.

[0058] The present invention accurately measures magnetic field data at different time points, and respectively determines the magnetic field intensity change rate and magnetic field diffusion direction in each magnetic field direction, and constructs arc diffusion morphology according to the magnetic field intensities in multiple arc diffusion directions, intuitively displays the diffusion of the arc, and helps to further analyze the law of arc diffusion, thereby promoting further enhancement of the arc extinguishing effect, increasing the arc diffusion range, promoting arc energy dispersion, and reducing arc damage to pole-mounted circuit breaker components.

[0059] See also Figure 3 , which is a flow chart of determining the arc deionization change rate according to an embodiment of the present invention. Specifically, the control unit determines the arc deionization change rate, including:

[0060] Step S11, determining the area of ​​the arc diffusion morphology at adjacent time points based on the arc diffusion morphology at a plurality of time points, and determining the current data at adjacent time points;

[0061] Step S12, determining arc deionization change rates at adjacent time points according to the area and current data at adjacent time points.

[0062] It can be understood that the arc deionization rate of change is generally the rate at which charged particles (such as electrons and ions) in the arc are converted into neutral particles through recombination and diffusion during the opening process. Because the number of free particles cannot be directly measured in practical applications, the arc deionization rate of change is determined based on the area and current data of the arc diffusion morphology.

[0063] The arc deionization change rate between the i-th time point and the i-1-th time point is the ratio of the first difference to the product of the second difference and the third difference. The arc diffusion area at the time point and the The second difference is the difference in arc diffusion area at the first time point; Time point and Time point The third difference is the The current magnitude through the current transformer at a time point and the The difference in the magnitude of the current passing through the current transformer at two points in time.

[0064] The arc deionization change rate during the entire opening process is the ratio of the sum of the differences between the arc deionization change rate at all time points and the mean of the arc deionization change rate at all time points to the number of arc diffusion directions.

[0065] Specifically, it also includes a magnetic field generator, which is connected to the control unit and is used to adjust the magnetic field strength and / or magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation.

[0066] Specifically, if the arc deionization change rate is less than the preset deionization change rate, the current passing through the magnetic field generator is increased to enhance the magnetic field strength and / or the installation position of the magnetic field generator is adjusted to change the magnetic field divergence direction to promote arc dissipation.

[0067] It is understandable that a longitudinal magnetic field is generated when the pole-mounted circuit breaker is opened. The longitudinal magnetic field has an effect on the charged particles in the arc and can affect the dissipation of the charged particles. When the charged particles diffuse slowly, the magnetic field strength and / or the magnetic field divergence direction can be adjusted by the magnetic field generator according to the arc deionization change rate to promote arc dissipation. The arc deionization change rate reflects the efficiency of arc dissipation. If the arc deionization change rate is less than the preset deionization change rate, it means that the arc dissipates slowly, then the current supplied to the magnetic field generator is increased to increase the magnetic field strength and / or the installation position of the magnetic field generator is adjusted to change the magnetic field divergence direction to promote arc dissipation.

[0068] It is understandable that the deionization change rate will be affected by many factors such as arc temperature, medium characteristics during arc burning, moving contact and static contact materials, magnetic field, arc shape, etc. Therefore, the preset deionization change rate can be determined through a large number of experiments and simulations. No specific limitation is made here. As long as the relevant magnetic field strength and magnetic field divergence direction can be adjusted by comparing the arc deionization change rate and the preset deionization change rate, it will not be repeated here.

[0069] In implementation, the magnetic field generator can be an electromagnetic coil or a permanent magnet or other device, which is not specifically limited here. As long as it can adjust the magnetic field strength and / or the magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation, it will not be repeated here.

[0070] In a specific embodiment, the current passing through the magnetic field generator is increased to increase the magnetic field strength and / or the installation position of the magnetic field generator is adjusted to change the magnetic field divergence direction to promote arc dissipation. Experiments can be conducted to test the effect of the magnetic field of the magnetic field generator under different current values ​​on arc dissipation, and then determine the effective current range so that the arc dissipation rate reaches the best within the effective current range. The value range of the increase in the current passing through the magnetic field generator can be determined based on the effective current range, which is not specifically limited here. The installation position of the adjusted magnetic field generator can be determined based on the distribution of the magnetic field of the magnetic field generator at different installation positions in several simulation experiments, which is not specifically limited here. As long as the magnetic field generator can adjust the magnetic field strength and / or the magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation, it will not be repeated here.

[0071] The present invention is provided with a magnetic field generator, which adjusts the magnetic field strength and / or the magnetic field divergence direction according to the arc deionization change rate to achieve precise control of the arc dissipation process, increase the arc dissipation rate, thereby further enhancing the arc extinguishing effect, increasing the arc diffusion range, promoting arc energy dispersion, reducing the damage of the arc to the pole-mounted circuit breaker components, and improving the integrity and reliability of the pole-mounted circuit breaker.

[0072] See also Figure 4 The above is a flow chart of determining the opening timing of the switch according to an embodiment of the present invention, specifically including:

[0073] Step S21, the operating unit determines the current overload state according to the current data;

[0074] Step S22, determining the tripping timing according to a comparison result of the duration of the current overload state and a preset overload protection time;

[0075] The current overload state is that the current data is greater than or equal to the preset rated current.

[0076] Specifically, if the duration is greater than or equal to the preset overload protection time, the moving contact and the static contact are opened.

[0077] It can be understood that when the current data passing through the current transformer is greater than the preset rated current, it indicates that the pole-mounted circuit breaker is overloaded. Once the current overload state is detected, the timestamp of the current overload state is recorded, and the duration of the current overload state is determined from the timestamp of the current overload state. The duration is compared with the preset overload protection time, and the circuit is opened according to the comparison result, and the circuit is cut off when necessary, so as to protect the pole-mounted circuit breaker and circuit safety.

[0078] In a specific embodiment, the current transformer needs to match the rated current of the pole-mounted circuit breaker. Generally, the rated current of the current transformer should be slightly greater than or equal to the rated current of the pole-mounted circuit breaker to ensure that the current can be accurately measured under normal working conditions and provide reliable protection in case of overload. Therefore, the preset rated current value can be determined based on the rated current of the pole-mounted circuit breaker and the load capacity of the circuit. No specific limitation is made here. As long as the operating unit can determine the current overload state based on the comparison result between the current data and the preset rated current, no further details will be given here.

[0079] It is understandable that a preset overload protection time that is too short may cause the circuit to be cut off in a short-term overload situation, affecting the normal operation of the system; a preset overload protection time that is too long may not be able to cut off the current in time, causing the pole-mounted circuit breaker to overheat or be damaged. Therefore, in practice, the preset overload protection time can be determined based on factors such as the overload capacity, thermal stability, and installation environment of the pole-mounted circuit breaker. As long as it can be achieved that when the duration is greater than or equal to the preset overload protection time, the moving contact and the static contact are disconnected, it will not be repeated here.

[0080] The present invention monitors the current data passing through the current transformer in real time and intelligently determines the current overload state and its duration to trigger the tripping operation, thereby effectively preventing the damage of the pole-mounted circuit breaker caused by long-term overload, thereby further enhancing the arc extinguishing effect, increasing the arc diffusion range, promoting the dispersion of arc energy, reducing the damage of the arc to the components of the pole-mounted circuit breaker, and improving the integrity and reliability of the pole-mounted circuit breaker.

[0081] Specifically, the operating unit adjusts the opening speed according to the arc deionization change rate, including:

[0082] If the arc deionization change rate is less than the preset deionization change rate, the opening speed is accelerated;

[0083] If the arc deionization change rate is greater than or equal to the preset deionization change rate, the opening speed is maintained.

[0084] It is understandable that if the arc deionization change rate is less than the preset deionization change rate, it means that the arc dissipation speed is slow and cannot be extinguished in a short time. In order to accelerate the arc extinction process, the opening speed can be accelerated to lengthen the arc length, increase the contact area between the arc and the surrounding medium, and promote the rapid extinction of the arc. If the arc deionization change rate is greater than or equal to the preset deionization change rate, it means that the arc dissipation speed has reached or exceeded the expected level. At this time, continuing to increase the opening speed may no longer have a significant effect on the extinction of the arc, but may increase the impact and wear on the circuit breaker components. Therefore, the operating unit will maintain the current opening speed and no longer accelerate.

[0085] In implementation, the increase in the opening speed can be determined based on the specific arc characteristics, pole-mounted circuit breaker design parameters, and stability requirements to ensure that the pole-mounted circuit breaker can extinguish the arc safely and quickly. No specific limitation is made here. As long as the arc dissipation speed can be increased by speeding up the opening speed, it will not be repeated here.

[0086] The present invention adjusts the opening speed based on the arc deionization change rate and optimizes the opening process of the pole-mounted circuit breaker, thereby further effectively increasing the range of arc diffusion, promoting arc energy dispersion, enhancing arc extinguishing effect, reducing arc damage to pole-mounted circuit breaker components, and improving the overall performance and reliability of the circuit breaker.

[0087] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A pole mounted circuit breaker, characterized in that: include: A vacuum interrupter chamber, the outer surface of which is provided with an insulating sleeve for electrically isolating the vacuum interrupter chamber from the external environment; A contact device, comprising a moving contact and a stationary contact symmetrically arranged in the vacuum interrupter chamber; Isolating switch, used to isolate the power supply to ensure the safety of maintenance work; A detection unit, used to detect magnetic field data of several positions of the vacuum interrupter when the moving contact and the static contact are opened at several time points, and to detect current data passing through the current transformer during the closing process; a control unit connected to the detection unit, for determining a magnetic field divergence direction and a magnetic field intensity change rate according to the magnetic field data, determining arc diffusion forms at a plurality of time points according to the magnetic field intensity change rate and the magnetic field divergence direction, determining an arc deionization change rate according to the arc diffusion form, and adjusting the magnetic field intensity and / or magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation; an operating unit connected to the detection unit, and used to control the gate action of the moving contact and the static contact, the gate action including opening and closing, determining the opening timing according to the current data, opening based on the opening timing, and adjusting the opening speed according to the arc deionization change rate; The control unit determines a plurality of magnetic field directions at a plurality of time points according to the magnetic field data, determines the change of magnetic field intensity in a single magnetic field direction respectively, and determines whether the magnetic field diffuses toward the single magnetic field direction according to the change of magnetic field intensity; The control unit determines the magnetic field strength of a single magnetic field direction according to the magnetic field data at a plurality of time points, determines the magnetic field strength change rate according to the magnetic field strength at adjacent time points, and if the magnetic field strength change rate is greater than or equal to a preset magnetic field strength change rate and the magnetic field diffuses in a single magnetic field direction, determines the single magnetic field direction as an arc diffusion direction, and constructs an arc diffusion morphology according to the plurality of arc diffusion directions; The control unit determines the area of ​​the arc diffusion morphology at adjacent time points based on the arc diffusion morphology at several time points, and determines the current data at adjacent time points, and determines the arc deionization change rate at adjacent time points according to the area and the current data at adjacent time points.

2. The pole mounted circuit breaker according to claim 1, characterized in that: It also includes a magnetic field generator, which is connected to the control unit and is used to adjust the magnetic field strength and / or magnetic field divergence direction according to the arc deionization change rate to promote arc dissipation.

3. The pole mounted circuit breaker according to claim 2, characterized in that: If the arc deionization change rate is less than the preset deionization change rate, the current passing through the magnetic field generator is increased to increase the magnetic field strength and / or the installation position of the magnetic field generator is adjusted to change the magnetic field divergence direction to promote arc dissipation.

4. The pole mounted circuit breaker according to claim 1, characterized in that: The operating unit determines the current overload state according to the current data, and determines the opening timing according to the comparison result of the duration of the current overload state and the preset overload protection time; The current overload state is that the current data is greater than or equal to the preset rated current.

5. The pole mounted circuit breaker according to claim 4, characterized in that: If the duration is greater than or equal to the preset overload protection time, the moving contact and the static contact are opened.

6. The pole mounted circuit breaker according to claim 1, characterized in that: The operating unit adjusts the opening speed according to the arc deionization change rate, including: If the arc deionization change rate is less than the preset deionization change rate, the opening speed is accelerated; If the arc deionization change rate is greater than or equal to the preset deionization change rate, the opening speed is maintained.

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