Surge suppression circuit breaker

Abstract

The utility model belongs to the technical field of power and electric appliances, and discloses a surge suppression circuit breaker, which comprises a phase controller and a first phase circuit breaking mechanism, the first phase circuit breaking mechanism comprises a first operating mechanism, a first sleeve, a first contact spring, a first insulating pull rod, a first vacuum arc-extinguishing chamber, a first upper wire outlet seat, a first lower wire outlet seat, a first nonlinear resistor and a first Spark closing device; the first sleeve is divided into a first switch chamber and a first action chamber from top to bottom. The first vacuum arc-extinguishing chamber and the first nonlinear resistor are installed in the first switch chamber. The first contact spring and the first insulating pull rod are arranged in the first action chamber; and the phase controller is used for receiving phase information of external power and controlling the first Spark closing device to perform spark closing according to the phase information. According to the utility model, the control of the Spark closing device is realized through the phase controller, so that spark closing is realized through the Spark closing device, the surge is reduced, and the reliability of the whole circuit breaker is improved.

Description

Technical Field

[0001] This utility model relates to the field of power electrical technology, and in particular to a surge suppression circuit breaker. Background Technology

[0002] In recent years, vacuum circuit breakers have been increasingly widely used in power systems. Vacuum circuit breakers generate switching overvoltages when cutting off current, reigniting, or disconnecting three phases. The amplitude of these switching overvoltages can cause insulation breakdown in equipment such as motors, phase-to-phase conductor flashover, and escalation of accidents, resulting in unnecessary losses. Existing technologies include various devices for limiting the switching overvoltages of vacuum circuit breakers, such as metal oxide surge arresters, RC absorbers, and combined overvoltage protection devices.

[0003] However, metal oxide surge arresters and combined overvoltage protectors have limited overvoltage suppression effectiveness. MOA surge arresters offer the worst protection for motors. While TBP and JPB combined overvoltage protectors are better than MOA, their margin is too small, resulting in unsatisfactory protection performance. Ordinary RC absorbers (RC protectors) suffer from problems such as excessive capacitive current during single-phase short circuits, causing the entire feeder circuit to trip, especially in locations with high-frequency components, leading to resistor burnout. Ungrounded RC protectors, while solving the problems of tripping due to excessive capacitive current and resistor burnout, do not eliminate high-frequency oscillations between phase and ground, resulting in a slightly higher accident rate.

[0004] Therefore, how to improve the reliability of circuit breakers is a technical issue that urgently needs to be studied in the industry. Utility Model Content

[0005] The purpose of this invention is to provide a surge suppression circuit breaker to solve one or more technical problems existing in the prior art, or at least provide a beneficial option or create conditions.

[0006] The solution to the technical problem of this utility model is: to provide a surge suppression circuit breaker, including: a phase controller and a first phase circuit breaking mechanism;

[0007] The first phase circuit breaking mechanism includes: a first operating mechanism, a first sleeve, a first contact spring, a first insulating pull rod, a first vacuum interrupter, a first upper outlet socket, a first lower outlet socket, a first nonlinear resistor, and a first Spark closer;

[0008] The first sleeve is divided into a first switching chamber and a first operating chamber from top to bottom. The first vacuum interrupter and the first nonlinear resistor are installed in the first switching chamber. One end of the first insulating rod is connected to the switching end of the first vacuum interrupter through a first contact spring, and the other end of the first insulating rod is connected to the first operating mechanism. The first contact spring and the first insulating rod are installed in the first operating chamber.

[0009] The first operating mechanism is used to push the switch terminal of the first vacuum interrupter through the first insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the first vacuum interrupter are electrically connected;

[0010] The first upper outgoing terminal is disposed at the upper part of the first switch chamber, and the first lower outgoing terminal is disposed between the first switch chamber and the first operating chamber;

[0011] The conductive portion of the first upper terminal block is connected to the upper conductive end of the first vacuum interrupter, and the conductive portion of the first lower terminal block is connected to the lower conductive end of the first vacuum interrupter.

[0012] The upper conductive end of the first nonlinear resistor is connected to the upper conductive end of the first vacuum interrupter, and the lower conductive end of the first nonlinear resistor is connected to the lower conductive end of the first vacuum interrupter.

[0013] One end of the first Spark closer is connected to the upper conductive end of the first vacuum interrupter, and the other end of the first Spark closer is connected to the lower conductive end of the first vacuum interrupter; the phase controller is used to receive the phase information of external power and control the first Spark closer to perform spark closing according to the phase information.

[0014] Furthermore, the first nonlinear resistor is a high-energy zinc oxide resistor.

[0015] Furthermore, the phase controller is connected to the control terminal of the first Spark closer via optical fiber.

[0016] Furthermore, the closing response time of the first Spark closer is ≤10μs.

[0017] Furthermore, the closing gap conduction time of the first Spark closer is <50μs, and the dispersion is <10μs.

[0018] Furthermore, the first sleeve is a component made of epoxy resin.

[0019] Furthermore, the surge suppression circuit breaker also includes: a second phase circuit breaking mechanism;

[0020] The second phase circuit breaker mechanism includes: a second operating mechanism, a second sleeve, a second contact spring, a second insulating pull rod, a second vacuum interrupter, a second upper outlet seat, a second lower outlet seat, a second nonlinear resistor, and a second Spark closer;

[0021] The second sleeve is divided into a second switching chamber and a second operating chamber from top to bottom. The second vacuum interrupter and the second nonlinear resistor are installed in the second switching chamber. One end of the second insulating rod is connected to the switching end of the second vacuum interrupter through the second contact spring, and the other end of the second insulating rod is connected to the second operating mechanism. The second contact spring and the second insulating rod are installed in the second operating chamber.

[0022] The second operating mechanism is used to push the switch terminal of the second vacuum interrupter through the second insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the second vacuum interrupter are electrically connected;

[0023] The second upper outgoing terminal is disposed at the upper part of the second switch chamber, and the second lower outgoing terminal is disposed between the second switch chamber and the second operating chamber;

[0024] The conductive portion of the second upper outlet socket is connected to the upper conductive end of the second vacuum interrupter, and the conductive portion of the second lower outlet socket is connected to the lower conductive end of the second vacuum interrupter.

[0025] The upper conductive end of the second nonlinear resistor is connected to the upper conductive end of the second vacuum interrupter, and the lower conductive end of the second nonlinear resistor is connected to the lower conductive end of the second vacuum interrupter.

[0026] One end of the second Spark closer is connected to the upper conductive end of the second vacuum interrupter, and the other end of the second Spark closer is connected to the lower conductive end of the second vacuum interrupter; the phase controller is used to receive the phase information of external power and control the second Spark closer to perform spark closing according to the phase information.

[0027] Furthermore, the second nonlinear resistor is a high-energy zinc oxide resistor.

[0028] Furthermore, the surge suppression circuit breaker also includes: a third-phase circuit breaker mechanism;

[0029] The third phase circuit breaker mechanism includes: a third operating mechanism, a third sleeve, a third contact spring, a third insulating pull rod, a third vacuum interrupter, a third upper outlet socket, a third lower outlet socket, a third nonlinear resistor, and a third Spark closer;

[0030] The third sleeve is divided into a third switching chamber and a third operating chamber from top to bottom. The third vacuum interrupter and the third nonlinear resistor are installed in the third switching chamber. One end of the third insulating rod is connected to the switching end of the third vacuum interrupter through a third contact spring, and the other end of the third insulating rod is connected to the third operating mechanism. The third contact spring and the third insulating rod are installed in the third operating chamber.

[0031] The third operating mechanism is used to push the switch terminal of the third vacuum interrupter through the third insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the third vacuum interrupter are electrically connected.

[0032] The third upper outgoing terminal is located at the upper part of the third switch chamber, and the third lower outgoing terminal is located between the third switch chamber and the third operating chamber.

[0033] The conductive part of the third upper outlet socket is connected to the upper conductive end of the third vacuum interrupter, and the conductive part of the third lower outlet socket is connected to the lower conductive end of the third vacuum interrupter.

[0034] The upper conductive end of the third nonlinear resistor is connected to the upper conductive end of the third vacuum interrupter, and the lower conductive end of the third nonlinear resistor is connected to the lower conductive end of the third vacuum interrupter.

[0035] One end of the switch of the third Spark closer is connected to the upper conductive end of the third vacuum interrupter, and the other end of the switch of the third Spark closer is connected to the lower conductive end of the third vacuum interrupter; the phase controller is used to receive the phase information of external power and control the third Spark closer to perform spark closing according to the phase information.

[0036] Furthermore, the third nonlinear resistor is a high-energy zinc oxide resistor.

[0037] The beneficial effects of this invention are as follows: This invention integrates the vacuum interrupter and the Spark closer within a sleeve through a rational structure. Furthermore, a phase controller controls the Spark closer, enabling spark closing before the vacuum interrupter closes, thus reducing surges and improving the overall reliability of the circuit breaker. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0039] Figure 1 This is a three-dimensional structural diagram of a surge suppression circuit breaker;

[0040] Figure 2 This is a schematic diagram of the internal structure of the first phase circuit breaker mechanism;

[0041] Figure 3This is a schematic diagram of the working electrical connection of the first phase circuit breaker mechanism. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0043] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0044] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a three-dimensional structural diagram of a surge suppression circuit breaker. Figure 2 This is a schematic diagram of the internal structure of the first phase circuit breaker mechanism. Figure 3 This is a schematic diagram of the working electrical connection of the first phase circuit breaker mechanism.

[0045] The main purpose of this application is to solve the technical problems in the prior art where the circuit breaker structure has poor surge suppression effect and poor overall structural reliability.

[0046] For this purpose, this application provides a surge suppression circuit breaker, including a phase controller 400 and a first phase circuit breaker 100. For three-phase circuit breaker control, in some further embodiments, the surge suppression circuit breaker also includes a second phase circuit breaker 200 and a third phase circuit breaker 300.

[0047] The phase controller 400 mainly acquires the phase information of each path, and uses the phase information to perform surge suppression on the first phase circuit breaker 100, the second phase circuit breaker 200 and the third phase circuit breaker 300, so as to create conditions for reliable closing.

[0048] For circuit breakers, the closing strategy is as follows: when the load is an inductive load (such as a transformer or reactor), the circuit breaker closes when the voltage phase angle is 90°; when the load is a capacitive load (such as a capacitor or filter), the circuit breaker closes when the voltage phase angle is 0°.

[0049] The first phase circuit breaker mechanism 100 includes the following structure: a first operating mechanism 102, a first sleeve 110, a first contact spring, a first insulating pull rod 101, a first vacuum interrupter 160, a first upper outlet seat 120, a first lower outlet seat 130, a first nonlinear resistor 140, and a first Spark closing device 150.

[0050] In some further specific embodiments, the first nonlinear resistor 140 is a high-energy zinc oxide resistor.

[0051] The first sleeve 110 is divided into a first switching chamber 111 and a first operating chamber 112 from top to bottom. The first vacuum interrupter 160 and the first nonlinear resistor 140 are installed in the first switching chamber 111. One end of the first insulating pull rod 101 is connected to the switching terminal of the first vacuum interrupter 160 through a first contact spring, and the other end of the first insulating pull rod 101 is connected to the first operating mechanism 102.

[0052] The first sleeve 110 is structurally divided into a first switching chamber 111 and a first operating chamber 112. A first vacuum interrupter 160, representing the electrical switch, is installed in the first switching chamber 111, while a first insulating pull rod 101 and a first contact spring, representing the mechanical structure, are installed in the first operating chamber 112. This spatial separation of the electrical and mechanical components prevents mutual interference. From another perspective, it also facilitates replacement and maintenance.

[0053] Regarding the material of the first sleeve 110, in some further specific embodiments, the first sleeve 110 is an epoxy resin component.

[0054] The first operating mechanism 102 is used to push the switch terminal of the first vacuum interrupter 160 through the first insulating pull rod 101, so that the upper conductive terminal and the lower conductive terminal of the first vacuum interrupter 160 are electrically connected.

[0055] The first upper terminal block 120 is disposed on the upper part of the first switch chamber 111, and the first lower terminal block 130 is disposed between the first switch chamber 111 and the first operating chamber 112.

[0056] The conductive portion of the first upper terminal block 120 is connected to the upper conductive end of the first vacuum interrupter 160, and the conductive portion of the first lower terminal block 130 is connected to the lower conductive end of the first vacuum interrupter 160.

[0057] The upper conductive end of the first nonlinear resistor 140 is connected to the upper conductive end of the first vacuum interrupter 160, and the lower conductive end of the first nonlinear resistor 140 is connected to the lower conductive end of the first vacuum interrupter 160.

[0058] One end of the first Spark closer 150 is connected to the upper conductive end of the first vacuum interrupter 160, and the other end of the first Spark closer 150 is connected to the lower conductive end of the first vacuum interrupter 160.

[0059] The phase controller 400 is used to receive phase information from external power and control the first Spark closer 150 to perform spark closing based on the phase information.

[0060] In this specific embodiment, the first phase circuit breaker 100 is responsible for closing the A-phase line. Therefore, the first upper terminal block 120 can be connected to a portion of the A-phase line, and the first lower terminal block 130 can be connected to another portion of the A-phase line. The first vacuum interrupter 160 is a controlled switch that can handle large currents. Its function is to be controlled by the first operating mechanism 102 to achieve the conduction of a portion of the A-phase line and another portion of the A-phase line, thereby realizing the closing operation of the A-phase line.

[0061] In the specific operation process, upon receiving a command to close the circuit breaker, the phase controller 400 acquires the phase information of the external power A-phase line through a sensor and determines the timing for closing the circuit breaker based on this phase information. When the closing timing is reached, the phase controller 400 issues a closing command. The closing command is transmitted to both the first Spark closer 150 and the first operating mechanism 102. Moreover, the first Spark closer 150 responds to the closing command earlier than the first operating mechanism 102.

[0062] Therefore, the first Spark closer 150 will close, at which point a portion of phase A and the other portion of phase A will be connected through the first Spark closer 150. Since the first nonlinear resistor 140 is applied beforehand across the two ends of the first Spark closer 150 (the two ends of the first vacuum interrupter 160), the first nonlinear resistor 140 limits the voltage across the first Spark closer 150, preventing damage to the first Spark closer 150 due to excessive voltage difference during closing.

[0063] After the first Spark closer 150 closes, the first operating mechanism 102 will also respond to the closing command, thereby controlling the first vacuum interrupter 160 to close.

[0064] Because the first Spark closer 150 has been pre-closed, the voltage difference across the first vacuum interrupter 160 is very small. Therefore, no surge will occur when the first vacuum interrupter 160 is closed, thus protecting the connection contacts of the first vacuum interrupter 160. After the first vacuum interrupter 160 is closed, the first Spark closer 150 will disconnect, thus separating from the connection of phase A. Since the first vacuum interrupter 160 has the capacity to carry large currents, phase A can allow large currents to pass through it by closing the first vacuum interrupter 160.

[0065] To ensure reliable communication between the phase controller 400 and the first Spark closer 150, in some further embodiments, the control terminals of the phase controller 400 and the first Spark closer 150 are connected via optical fiber. Specifically, the closing response time of the first Spark closer 150 is ≤10μs. The closing gap conduction time of the first Spark closer 150 is <50μs, and the dispersion is <10μs.

[0066] The structure of the second phase circuit breaker mechanism 200 is similar to that of the first phase circuit breaker mechanism 100. The second phase circuit breaker mechanism 200 includes: a second operating mechanism, a second sleeve, a second contact spring, a second insulating pull rod, a second vacuum interrupter, a second upper lead-out socket, a second lower lead-out socket, a second nonlinear resistor, and a second Spark closing device.

[0067] In some further specific embodiments, the second nonlinear resistor is a high-energy zinc oxide resistor.

[0068] The second sleeve is divided into a second switching chamber and a second operating chamber from top to bottom. The second vacuum interrupter and the second nonlinear resistor are installed in the second switching chamber. One end of the second insulating rod is connected to the switching terminal of the second vacuum interrupter via a second contact spring, and the other end of the second insulating rod is connected to the second operating mechanism.

[0069] The second sleeve is structurally divided into a second switching chamber and a second operating chamber. The second vacuum interrupter, representing the electrical switch, is installed in the second switching chamber, while the second insulating pull rod, representing the mechanical structure, and the second contact spring are installed in the second operating chamber. This spatial separation of the electrical and mechanical components prevents mutual interference. From another perspective, it also facilitates replacement and maintenance.

[0070] Regarding the material of the second sleeve, in some further specific embodiments, the second sleeve is an epoxy resin component.

[0071] The second operating mechanism is used to push the switch terminal of the second vacuum interrupter through the second insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the second vacuum interrupter are electrically connected;

[0072] The second upper outgoing terminal is disposed at the upper part of the second switch chamber, and the second lower outgoing terminal is disposed between the second switch chamber and the second operating chamber;

[0073] The conductive portion of the second upper outlet socket is connected to the upper conductive end of the second vacuum interrupter, and the conductive portion of the second lower outlet socket is connected to the lower conductive end of the second vacuum interrupter.

[0074] The upper conductive end of the second nonlinear resistor is connected to the upper conductive end of the second vacuum interrupter, and the lower conductive end of the second nonlinear resistor is connected to the lower conductive end of the second vacuum interrupter.

[0075] One end of the second Spark closer is connected to the upper conductive terminal of the second vacuum interrupter, and the other end of the second Spark closer is connected to the lower conductive terminal of the second vacuum interrupter. The phase controller 400 is used to receive phase information from external power and control the second Spark closer to perform spark closing based on the phase information.

[0076] In this specific embodiment, the second phase circuit breaker 200 is responsible for closing the B-phase line. Therefore, the second upper outgoing terminal can be connected to a portion of the B-phase line, and the second lower outgoing terminal can be connected to the other portion of the B-phase line. The second vacuum interrupter is a controlled switch that can handle large currents. Its function is to be controlled by the second operating mechanism to achieve the conduction of a portion of the B-phase line and the other portion of the B-phase line, thereby realizing the closing operation of the B-phase line.

[0077] In the specific operation process, upon receiving a closing command, the phase controller 400 acquires the phase information of the external power B-phase line through a sensor and determines the closing timing based on this phase information. When the closing timing is reached, the phase controller 400 issues a closing command. This closing command is then transmitted to the second Spark closer and the second operating mechanism. Furthermore, the second Spark closer responds to the closing command earlier than the second operating mechanism.

[0078] Therefore, the second Spark closer will close, at which point a portion of phase B and the other portion of phase B will be connected through the second Spark closer. Because the second nonlinear resistor is applied beforehand across the two ends of the second Spark closer (the two ends of the second vacuum interrupter), the second nonlinear resistor limits the voltage across the second Spark closer, preventing damage to the second Spark closer due to excessive voltage difference during closing.

[0079] After the second Spark closer is closed, the second operating mechanism will also respond to the closing command, thereby controlling the second vacuum interrupter to close.

[0080] Because the second Spark closer was pre-closed, the voltage difference across the second vacuum interrupter is very small. Therefore, no surge is generated when the second vacuum interrupter closes, thus protecting the connection contacts of the second vacuum interrupter. After the second vacuum interrupter closes, the second Spark closer will disconnect, thus separating it from the B-phase line connection. Since the second vacuum interrupter has the capacity to carry large currents, the B-phase line can allow large currents to pass through by closing the second vacuum interrupter.

[0081] To ensure reliable communication between the phase controller 400 and the second Spark closer, in some further embodiments, the control terminals of the phase controller 400 and the second Spark closer are connected via optical fiber. Specifically, the closing response time of the second Spark closer is ≤10μs. The closing gap conduction time of the second Spark closer is <50μs, and the dispersion is <10μs.

[0082] The third phase circuit breaker mechanism 300 has a similar structure to the first phase circuit breaker mechanism 100. The third phase circuit breaker mechanism 300 includes: a third operating mechanism, a third sleeve, a third contact spring, a third insulating pull rod, a third vacuum interrupter, a third upper lead-out socket, a third lower lead-out socket, a third nonlinear resistor, and a third Spark closing device.

[0083] In some further specific embodiments, the third nonlinear resistor is a high-energy zinc oxide resistor.

[0084] The third sleeve is divided into a third switching chamber and a third operating chamber from top to bottom. The third vacuum interrupter and the third nonlinear resistor are installed in the third switching chamber. One end of the third insulating rod is connected to the switching terminal of the third vacuum interrupter via a third contact spring, and the other end of the third insulating rod is connected to the third operating mechanism.

[0085] The third sleeve is structurally divided into a third switching chamber and a third operating chamber. The third vacuum interrupter, representing the electrical switch, is installed in the third switching chamber, while the third insulating pull rod and the third contact spring, representing the mechanical structure, are installed in the third operating chamber. This spatial separation of the electrical and mechanical components prevents mutual interference. From another perspective, it also facilitates replacement and maintenance.

[0086] Regarding the material of the third sleeve, in some further specific embodiments, the third sleeve is an epoxy resin component.

[0087] The third operating mechanism is used to push the switch terminal of the third vacuum interrupter through the third insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the third vacuum interrupter are electrically connected.

[0088] The third upper outgoing terminal is located at the top of the third switch chamber, and the third lower outgoing terminal is located between the third switch chamber and the third operating chamber.

[0089] The conductive part of the third upper outlet socket is connected to the upper conductive end of the third vacuum interrupter, and the conductive part of the third lower outlet socket is connected to the lower conductive end of the third vacuum interrupter.

[0090] The upper conductive end of the third nonlinear resistor is connected to the upper conductive end of the third vacuum interrupter, and the lower conductive end of the third nonlinear resistor is connected to the lower conductive end of the third vacuum interrupter.

[0091] One end of the switch of the third Spark closer is connected to the upper conductive terminal of the third vacuum interrupter, and the other end of the switch of the third Spark closer is connected to the lower conductive terminal of the third vacuum interrupter. The phase controller 400 is used to receive phase information of external power and control the third Spark closer to perform spark closing according to the phase information.

[0092] In this specific embodiment, the third phase circuit breaker 300 is responsible for closing the C-phase line. Therefore, the third upper outgoing terminal can be connected to a portion of the C-phase line, and the third lower outgoing terminal can be connected to the other portion of the C-phase line. The third vacuum interrupter is a controlled switch that can handle large currents. Its function is to be controlled by the third operating mechanism to achieve the conduction of a portion of the C-phase line and the other portion of the C-phase line, thereby realizing the closing operation of the C-phase line.

[0093] In the specific operation process, upon receiving a closing command, the phase controller 400 acquires the phase information of the external power C-phase line through a sensor and determines the closing timing based on this phase information. When the closing timing is reached, the phase controller 400 issues a closing command. This closing command is transmitted to both the third Spark closer and the third operating mechanism. Furthermore, the third Spark closer responds to the closing command earlier than the third operating mechanism.

[0094] Therefore, the third Spark closer will close, at which point a portion of the C-phase line and the other portion of the C-phase line will be connected through the third Spark closer. Since the third nonlinear resistor is applied beforehand across the three ends of the third Spark closer (the two ends of the third vacuum interrupter), the third nonlinear resistor limits the voltage across the three Spark closer, preventing damage to the third Spark closer due to excessive voltage difference during closing.

[0095] After the third Spark closer closes, the third operating mechanism will also respond to the closing command, thereby controlling the third vacuum interrupter to close.

[0096] Because the third Spark closer was pre-closed, the voltage difference across the third vacuum interrupter is very small. Therefore, no surge is generated when the third vacuum interrupter closes, thus protecting the connection contacts of the third vacuum interrupter. After the third vacuum interrupter closes, the third Spark closer will disconnect, thus separating it from the C-phase line. Since the third vacuum interrupter has the capacity to carry large currents, the C-phase line can allow large currents to pass through by closing the third vacuum interrupter.

[0097] To ensure reliable communication between the phase controller 400 and the third Spark closer, in some further embodiments, the control terminals of the phase controller 400 and the third Spark closer are connected via optical fiber. The closing response time of the third Spark closer is ≤10μs. The closing gap conduction time of the third Spark closer is <50μs, and the dispersion is <10μs.

[0098] The surge suppression circuit breaker of this invention has been simulated and tested. When the transformer is connected to the system, there is no inrush current; it directly enters the steady-state excitation current. In extreme cases, the short-time excitation inrush current does not exceed 1.15 times the steady-state excitation current. For example, in multiple no-load closing tests of a 500kV, 1200MVA transformer at a 500kV substation, the transformer's no-load excitation current was only 0.03% of its rated current (far less than the surge current that would reach nearly twice (3000A) of the rated current using other inrush suppression measures).

[0099] This invention integrates the vacuum interrupter and the Spark closer within a sleeve through a rational structural design. Furthermore, a phase controller controls the Spark closer, enabling spark closing before the vacuum interrupter closes, thus reducing surges and improving the overall reliability of the circuit breaker.

[0100] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A surge suppression circuit breaker, characterized in that, include: Phase controller and first phase circuit breaker mechanism; The first phase circuit breaking mechanism includes: a first operating mechanism, a first sleeve, a first contact spring, a first insulating pull rod, a first vacuum interrupter, a first upper outlet socket, a first lower outlet socket, a first nonlinear resistor, and a first Spark closer; The first sleeve is divided into a first switching chamber and a first operating chamber from top to bottom. The first vacuum interrupter and the first nonlinear resistor are installed in the first switching chamber. One end of the first insulating rod is connected to the switching end of the first vacuum interrupter through a first contact spring, and the other end of the first insulating rod is connected to the first operating mechanism. The first contact spring and the first insulating rod are installed in the first operating chamber. The first operating mechanism is used to push the switch terminal of the first vacuum interrupter through the first insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the first vacuum interrupter are electrically connected; The first upper outgoing terminal is disposed at the upper part of the first switch chamber, and the first lower outgoing terminal is disposed between the first switch chamber and the first operating chamber; The conductive portion of the first upper terminal block is connected to the upper conductive end of the first vacuum interrupter, and the conductive portion of the first lower terminal block is connected to the lower conductive end of the first vacuum interrupter. The upper conductive end of the first nonlinear resistor is connected to the upper conductive end of the first vacuum interrupter, and the lower conductive end of the first nonlinear resistor is connected to the lower conductive end of the first vacuum interrupter. One end of the first Spark closer is connected to the upper conductive end of the first vacuum interrupter, and the other end of the first Spark closer is connected to the lower conductive end of the first vacuum interrupter; the phase controller is used to receive the phase information of external power and control the first Spark closer to perform spark closing according to the phase information.

2. The surge suppression circuit breaker according to claim 1, characterized in that, The first nonlinear resistor is a high-energy zinc oxide resistor.

3. A surge suppression circuit breaker according to claim 1, characterized in that, The phase controller is connected to the control terminal of the first Spark closer via optical fiber.

4. A surge suppression circuit breaker according to claim 1, characterized in that, The closing response time of the first Spark closer is ≤10μs.

5. A surge suppression circuit breaker according to claim 1, characterized in that, The closing gap conduction time of the first Spark closer is <50μs, and the dispersion is <10μs.

6. A surge suppression circuit breaker according to claim 1, characterized in that, The first sleeve is a component made of epoxy resin.

7. A surge suppression circuit breaker according to claim 1, characterized in that, Also includes: Second phase circuit breaker mechanism; The second phase circuit breaker mechanism includes: a second operating mechanism, a second sleeve, a second contact spring, a second insulating pull rod, a second vacuum interrupter, a second upper outlet seat, a second lower outlet seat, a second nonlinear resistor, and a second Spark closer; The second sleeve is divided into a second switching chamber and a second operating chamber from top to bottom. The second vacuum interrupter and the second nonlinear resistor are installed in the second switching chamber. One end of the second insulating rod is connected to the switching end of the second vacuum interrupter through the second contact spring, and the other end of the second insulating rod is connected to the second operating mechanism. The second contact spring and the second insulating rod are installed in the second operating chamber. The second operating mechanism is used to push the switch terminal of the second vacuum interrupter through the second insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the second vacuum interrupter are electrically connected; The second upper outgoing terminal is disposed at the upper part of the second switch chamber, and the second lower outgoing terminal is disposed between the second switch chamber and the second operating chamber; The conductive portion of the second upper outlet socket is connected to the upper conductive end of the second vacuum interrupter, and the conductive portion of the second lower outlet socket is connected to the lower conductive end of the second vacuum interrupter. The upper conductive end of the second nonlinear resistor is connected to the upper conductive end of the second vacuum interrupter, and the lower conductive end of the second nonlinear resistor is connected to the lower conductive end of the second vacuum interrupter. One end of the second Spark closer is connected to the upper conductive end of the second vacuum interrupter, and the other end of the second Spark closer is connected to the lower conductive end of the second vacuum interrupter; the phase controller is used to receive the phase information of external power and control the second Spark closer to perform spark closing according to the phase information.

8. A surge suppression circuit breaker according to claim 7, characterized in that, The second nonlinear resistor is a high-energy zinc oxide resistor.

9. A surge suppression circuit breaker according to claim 1, characterized in that, Also includes: Third phase circuit breaker mechanism; The third phase circuit breaker mechanism includes: a third operating mechanism, a third sleeve, a third contact spring, a third insulating pull rod, a third vacuum interrupter, a third upper outlet socket, a third lower outlet socket, a third nonlinear resistor, and a third Spark closer; The third sleeve is divided into a third switching chamber and a third operating chamber from top to bottom. The third vacuum interrupter and the third nonlinear resistor are installed in the third switching chamber. One end of the third insulating rod is connected to the switching end of the third vacuum interrupter through a third contact spring, and the other end of the third insulating rod is connected to the third operating mechanism. The third contact spring and the third insulating rod are installed in the third operating chamber. The third operating mechanism is used to push the switch terminal of the third vacuum interrupter through the third insulating pull rod, so that the upper conductive terminal and the lower conductive terminal of the third vacuum interrupter are electrically connected. The third upper outgoing terminal is located at the upper part of the third switch chamber, and the third lower outgoing terminal is located between the third switch chamber and the third operating chamber. The conductive part of the third upper outlet socket is connected to the upper conductive end of the third vacuum interrupter, and the conductive part of the third lower outlet socket is connected to the lower conductive end of the third vacuum interrupter. The upper conductive end of the third nonlinear resistor is connected to the upper conductive end of the third vacuum interrupter, and the lower conductive end of the third nonlinear resistor is connected to the lower conductive end of the third vacuum interrupter. One end of the switch of the third Spark closer is connected to the upper conductive end of the third vacuum interrupter, and the other end of the switch of the third Spark closer is connected to the lower conductive end of the third vacuum interrupter; the phase controller is used to receive the phase information of external power and control the third Spark closer to perform spark closing according to the phase information.

10. A surge suppression circuit breaker according to claim 9, characterized in that, The third nonlinear resistor is a high-energy zinc oxide resistor.

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