Series compensation circuit and 35kv power transmission line

Abstract

The utility model provides a series compensation circuit and a 35kv power transmission line. The series compensation circuit comprises a double-pole circuit breaker, the double-pole circuit breaker comprises a first pole and a second pole, the first pole and the second pole in the double-pole circuit breaker are connected in parallel, and the first pole and the second pole are in-phase poles; the series compensation capacitor is connected with the first pole in parallel, and the series compensation capacitor is connected with the second pole in parallel; the damping branch is connected with the first pole in series, the damping branch is connected with the second pole in parallel, the first pole is used as a quick switch in the series compensation circuit, and the second pole is used as a bypass switch in the series compensation circuit. According to the series compensation circuit, the scene universality of the series compensation circuit can be effectively improved, and meanwhile the manufacturing cost of the series compensation circuit is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a series compensation technology, in particular to a series compensation circuit and a 35kv power transmission line. BACKGROUND

[0002] In long-distance power transmission lines and high-voltage direct current (HVDC) systems, series compensation technology is widely used to improve the transmission capacity and stability of the line. Series compensation can effectively compensate for the inductive reactance of the line by connecting a capacitor in series with the transmission line, thereby reducing the phase angle of the line and improving the effective power transmission. This technology is particularly important in modern power systems, especially under high load and complex load conditions.

[0003] In related technologies, a 10KV series compensation circuit connects a capacitor in series with the transmission line, mainly used to improve the power factor, increase the voltage stability and increase the transmission capacity. Compared with the 10KV series compensation circuit, the components such as capacitors and transformers of the 35KV series compensation circuit are usually larger and thicker to meet the insulation and bearing requirements of high voltage, and the cost is higher. The 10KV series compensation circuit cannot meet the insulation and bearing requirements of high voltage, so it cannot be directly used in the 35KV scenario. The 35KV series compensation circuit, although can be used in the 10KV scenario, will result in high manufacturing cost, so the related technology cannot improve the scene adaptability of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit. CONTENT OF THE INVENTION

[0004] The application embodiment provides a series compensation circuit and a 35kv power transmission line, which can effectively improve the scene adaptability of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit.

[0005] The technical scheme of the application embodiment is implemented as follows:

[0006] The application embodiment provides a bipolar circuit breaker, comprising:

[0007] The bipolar circuit breaker comprises a first pole and a second pole, and the first pole and the second pole in the bipolar circuit breaker are connected in parallel, wherein the first pole and the second pole are homopolar poles;

[0008] The series compensation capacitor is connected in parallel with the first pole and the second pole.

[0009] A damping branch is connected in series with the first pole column, the damping branch is connected in parallel with the second pole column, the first pole column is used as a fast switch in the series compensation circuit, and the second pole column is used as a bypass switch in the series compensation circuit.

[0010] The series compensation circuit comprises a voltage limiter connected in parallel with the series compensation capacitor, the voltage limiter is connected in parallel with the second pole column, and the voltage limiter is connected in parallel with the first pole column; a current sensor is connected in series with the voltage limiter, the current sensor is connected in parallel with the first pole column, and the current sensor is connected in parallel with the second pole column; a voltage sensor is connected in parallel with the current sensor, the voltage sensor is connected in parallel with each of the first pole columns, and the voltage sensor is connected in parallel with the second pole column.

[0011] The series compensation circuit comprises a general controller and a signal aggregation board, the general controller is connected with the signal aggregation board; the signal aggregation board is connected in communication with the high-voltage board, the high-voltage board is connected with the operation controller in the double-pole circuit breaker; the operation controller is used to acquire state information of the first pole column and the second pole column; the high-voltage board is used to acquire the state information sent by the operation controller and send the state information to the signal aggregation board, and the signal aggregation board sends the state information to the general controller; the general controller is used to generate control information based on the state information and send the control information to the high-voltage board through the signal aggregation board; the high-voltage board is also used to send the control information to the operation controller, and the operation controller is used to control the first pole column and / or the second pole column based on the control information.

[0012] The first pole column comprises a first operation mechanism, and the second pole column comprises a second operation mechanism; the operation controller comprises a first operation controller and a second operation controller; the first operation mechanism is connected with the first operation controller, and the second operation mechanism is connected with the second operation controller; the first operation mechanism is used to open and close according to the control information under the control of the first operation controller; and the second operation mechanism is used to open and close according to the control information under the control of the second operation controller.

[0013] The double-pole circuit breaker comprises a containing box, the first pole column and the second pole column are arranged on the same side of the containing box, and the first pole column and the second pole column extend along a first direction.

[0014] The accommodating box comprises an accommodating cavity, the first pole column comprises a first pole column body and a first pole column accommodating cavity, and the second pole column comprises a second pole column body and a second pole column accommodating cavity; the first pole column body and the second pole column body are arranged on the same side of the accommodating box, and the first pole column body and the second pole column body extend along a first direction; the first pole column accommodating cavity and the second pole column accommodating cavity are respectively through the accommodating cavity.

[0015] The double-pole circuit breaker comprises a high-voltage plate shell, and the high-voltage plate shell is accommodated in the accommodating cavity; the high-voltage plate shell is used for accommodating the high-voltage plate.

[0016] The series compensation circuit comprises a double isolation switch, and the series compensation capacitor is connected in parallel with the second pole column through the double isolation switch; the first pole column and the second pole column are used for redundantly protecting the series compensation capacitor and the voltage limiter.

[0017] The series compensation circuit comprises a plurality of support insulators, each of the support insulators is connected with the double-pole circuit breaker, the series compensation capacitor and the damping branch, and each of the support insulators is a 35KV support insulator.

[0018] A 35kv power transmission line, the 35kv power transmission line comprises a series compensation circuit, a first group of the series compensation circuits is connected with an A-phase circuit of the power transmission line, a second group of the series compensation circuits is connected with a B-phase circuit of the power transmission line, and a third group of the series compensation circuits is connected with a C-phase circuit of the power transmission line.

[0019] The embodiments of the application have the following beneficial effects:

[0020] Because the distance between each pole of the three-phase three-pole circuit breaker in the traditional 10kV series compensation circuit is relatively short, it is prone to phase-to-phase short circuits. Therefore, it cannot meet the insulation requirements of the 35kV scenario. Therefore, the three-phase three-pole circuit breaker in the traditional 10kV series compensation circuit is replaced with a bipolar circuit breaker without changing other components (series compensation capacitor and damping branch) in the traditional 10kV series compensation circuit. Since the bipolar circuit breaker includes a first pole and a second pole, and the first pole and the second pole in the bipolar circuit breaker are connected in parallel, by replacing the three-phase three-pole circuit breaker with a bipolar circuit breaker, the insulation requirements can be improved without changing the distance between the poles. Thus, the series compensation circuit provided in this application embodiment can adapt to both 10kV and 35kV scenarios without changing the overall circuit volume, based on the traditional 10kV series compensation circuit, thereby effectively improving the scenario versatility of the series compensation circuit. Meanwhile, since the components of a traditional 35kV series compensation circuit are typically larger and thicker than those of a traditional 10kV series compensation circuit, the series compensation circuit provided in this application embodiment has an overall circuit volume comparable to that of a traditional 10kV series compensation circuit. Therefore, its manufacturing cost is significantly lower than that of a traditional 35kV series compensation circuit. Furthermore, it is applicable to the insulation requirements of 35kV scenarios, thereby effectively reducing the manufacturing cost of the series compensation circuit. Therefore, the series compensation circuit proposed in this application embodiment can effectively improve the versatility of series compensation circuits while reducing their manufacturing cost. Attached Figure Description

[0021] Figure 1 This is a front view of the double-pole circuit breaker provided in the embodiments of this application;

[0022] Figure 2 This is a left view of the double-pole circuit breaker provided in the embodiments of this application;

[0023] Figure 3 This is a top view of the double-pole circuit breaker provided in the embodiments of this application;

[0024] Figure 4 This is a schematic diagram of the series compensation circuit provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the high-voltage board housing provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the control logic of the master controller provided in the embodiments of this application. Detailed Implementation

[0027] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings, and the described embodiments should not be regarded as limiting the present application. All other embodiments obtained by those of ordinary skill in the art without creative effort fall within the scope of the present application.

[0028] In the following description, "some embodiments" are referred to, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0029] In the following description, the terms "first\second\third" are only used to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0030] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as commonly understood by those skilled in the art. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0031] Before the embodiments of the present application are further described in detail, the terms and phrases involved in the embodiments of the present application are explained, and the terms and phrases involved in the embodiments of the present application are applicable to the following explanations.

[0032] 1) Series compensation: Series compensation refers to a compensation method in which capacitors or inductors are connected in series in a certain part or the entire length of a power transmission line in a power system to improve the transmission capacity and stability of the transmission line. In long-distance transmission lines and high-voltage direct current (HVDC) systems, the transmission line itself exhibits inductive characteristics, i.e., the inductance of the line is relatively large. When transmitting a large amount of power, the inductance of the line will cause voltage drop and an increase in phase angle, thereby reducing the stability of the system and limiting the transmission capacity. The purpose of series compensation is to reduce the impact of this inductance. Series compensation is achieved by connecting capacitors in series in the transmission line. The capacitors provide capacitive reactance in the circuit, which cancels out the inductive reactance of the line, thereby reducing the total reactance of the line. In this way, the phase angle of the line can be reduced, thereby improving the effective power transmission capacity of the system. Through series compensation, the voltage drop of the transmission line can be reduced, the voltage stability can be improved, the phase angle of the line can be reduced, the stability limit of the system can be improved, and the transient stability of the system can be improved, reducing the voltage drop of the system under fault conditions. In modern power systems, especially under high load and complex load conditions, series compensation technology is particularly important. It can effectively improve the operating efficiency of the system and ensure the safe and stable operation of the power system under extreme load conditions.

[0033] 2) Circuit breaker: is an important switching device, mainly used for connecting and disconnecting normal working current in power systems, and automatically cutting off fault current when short circuit, overload and other faults occur to protect the circuit and electrical equipment from damage. Circuit breakers can connect and disconnect circuits under normal conditions, and can automatically trip and quickly cut off the circuit when abnormal conditions such as overload and short circuit occur in the circuit to prevent accidents from expanding.

[0034] In related technologies, for 10KV series compensation circuit, by connecting capacitors in series in the transmission line, it is mainly used to improve the power factor, improve the voltage stability and increase the transmission capacity. Compared with 10KV series compensation circuit, the components such as capacitors and transformers of 35KV series compensation circuit are usually larger and thicker to meet the insulation and bearing requirements of high voltage, and the cost is higher. The 10KV series compensation circuit cannot meet the insulation and bearing requirements of high voltage, so it cannot be directly used in the 35KV scenario, and the components of the 35KV series compensation circuit are usually larger and thicker, although it can be used in the 10KV scenario, but it will lead to high manufacturing cost, so in related technologies, it is impossible to effectively improve the scene adaptability of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit.

[0035] The embodiments of the present application provide a series compensation circuit and a 35kv transmission line, which can effectively improve the scene adaptability of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit.

[0036] Figure 1 This is a front view of the double-pole circuit breaker provided in the embodiments of this application; Figure 2 This is a left view of the double-pole circuit breaker provided in the embodiments of this application; Figure 3 This is a top view of the double-pole circuit breaker provided in the embodiments of this application; the following will be combined with Figures 1 to 3 This illustrates exemplary applications and implementations of the bipolar circuit breaker provided in the embodiments of this application.

[0037] In some embodiments, see Figures 1 to 3 The illustrated double-pole circuit breaker includes a first pole 2 and a second pole 3. The first pole 2 and the second pole 3 are connected in parallel. The first pole 2 and the second pole 3 are poles of the same phase. Poles of the same phase mean that the first pole 2 and the second pole 3 are both connected to the same phase of the transmission line, such as phase A, or the first pole 2 and the second pole 3 are both connected to phase B, or the first pole 2 and the second pole 3 are both connected to phase C.

[0038] In some embodiments, a double-pole circuit breaker is a switching device used in a power system, comprising two main components: a first pole 2 and a second pole 3. The first pole 2 and the second pole 3 are connected in parallel. Parallel connection means that the two ends of the two poles are connected to the same node, allowing current to flow through either pole or both poles simultaneously. The advantage of parallel connection is that if one pole fails for some reason, the other pole can still carry the current, thus maintaining circuit continuity.

[0039] In some embodiments, in-phase terminals refer to two terminals that are electrically in phase. In alternating current systems, phase refers to the position of the voltage or current waveform relative to the time axis. When two terminals are in phase, they are electrically synchronized, meaning their voltage and current waveforms are consistent at any given point in time. This is crucial because it ensures that the two terminals can carry the same current simultaneously and provide coordinated operation.

[0040] In some embodiments, the bipolar circuit breaker includes an operation controller and a high-voltage board, the high-voltage board being connected to the operation controller in the bipolar circuit breaker.

[0041] In some embodiments, an operating controller is a component for controlling the operation of a circuit breaker. It typically includes a manual or electric operating mechanism for sending signals to the circuit breaker to close (connect the circuit) or open (disconnect the circuit). The operating controller can be a simple switch or a complex electronic control system.

[0042] In some embodiments, the high-voltage plate is a component in the circuit breaker used to carry and distribute high voltage. It is usually made of insulating material to ensure safe carrying of high-voltage current. The role of the high-voltage plate is to connect the operating controller and the double-pole column circuit breaker, so that the instructions of the operating controller can be transmitted to the pole column of the circuit breaker.

[0043] In some embodiments, the high-voltage plate is connected to the operating controller in the double-pole column circuit breaker. This means that the operating controller establishes contact with the pole column of the circuit breaker through the high-voltage plate. In this way, when the operating controller issues a closing or opening instruction, these instructions can be transmitted to the pole column through the high-voltage plate, thereby controlling the on or off of the circuit.

[0044] In this way, the double-pole column circuit breaker, which includes two parallel and in-phase pole columns, as well as a controller for controlling operation and a plate for carrying high-voltage current. The operating controller is connected to the double-pole column circuit breaker through the high-voltage plate, so that the circuit breaker can perform opening or closing operations according to the instructions of the operating controller. Such a design makes the circuit breaker both reliable and efficient, suitable for handling the protection task of high-voltage circuits.

[0045] In some embodiments, the double-pole column circuit breaker includes a housing box, the first pole column 2 and the second pole column 3 are arranged on the same side of the housing box, and the first pole column 2 and the second pole column 3 extend in a first direction.

[0046] As an example, see Figures 1 to 3 , the double-pole column circuit breaker includes a housing box 4, the first pole column 2 and the second pole column 3 are arranged on the same side of the housing box 4, and the first pole column 2 and the second pole column 3 extend in a first direction.

[0047] In some embodiments, the double-pole column circuit breaker also includes a housing box 4, which is the outer shell of the circuit breaker, used to protect the internal components from the external environment, while also providing support for the internal components. The first pole column 2 and the second pole column 3 are arranged on the same side of the housing box 4. This layout can save space, while making the installation and maintenance of the circuit breaker more convenient.

[0048] In some embodiments, the first pole column 2 and the second pole column 3 extend in a first direction, where the first direction usually refers to the vertical direction or the horizontal direction, depending on the design of the circuit breaker. This extension helps the reasonable layout of the pole columns in space, and can make the overall structure of the circuit breaker more compact.

[0049] In some embodiments, the housing box 4 comprises a housing inner cavity 41, the first pole 2 comprises a first pole body 21 and a first pole housing cavity 22; the second pole 3 comprises a second pole body 31 and a second pole housing cavity 32; the first pole body 21 and the second pole body 31 are arranged on the same side of the housing box 4, and the first pole body 21 and the second pole body 31 extend in a first direction; the first pole housing cavity 22 and the second pole housing cavity 32 are respectively through the housing inner cavity 41.

[0050] As an example, referring to Figures 1 to 3 , the housing box 4 comprises a housing inner cavity 41, the first pole 2 comprises a first pole body 21 and a first pole housing cavity 22; the second pole 3 comprises a second pole body 31 and a second pole housing cavity 32; the first pole body 21 and the second pole body 31 are arranged on the same side of the housing box 4, and the first pole body 21 and the second pole body 31 extend in a first direction; the first pole housing cavity 22 and the second pole housing cavity 32 are respectively through the housing inner cavity 41.

[0051] In some embodiments, the housing box 4 is the outer shell of the circuit breaker, which is used to protect the internal components while providing mechanical support. It is usually made of insulating material to prevent the external environment from affecting the internal components. The first pole 2 and the second pole 3 are arranged on the same side of the housing box 4, which means they are spatially adjacent. Such a layout helps to optimize space utilization and makes the design of the circuit breaker more compact. The body of the first pole 2 and the second pole 3 is their main structural part, usually including contacts, arc extinguishing chambers and other key components. The housing cavity of the first pole 2 and the second pole 3 refers to the space inside the body, which is used to accommodate and guide the current. The housing box 4 has a housing inner cavity 41 inside, which is the space inside the housing box 4, used to place the first pole housing cavity and the second pole housing cavity of the first pole 2 and the second pole 3.

[0052] In some embodiments, the housing cavity of the first pole 2 and the housing cavity of the second pole 3 are respectively through the housing inner cavity 41 of the housing box 4. This means that the housing cavity of the pole is connected with the space inside the housing box 4, which is beneficial for the flow of current and heat dissipation, and also helps to maintain and check the status of the inside of the pole.

[0053] In some embodiments, the double-pole circuit breaker comprises a high-voltage plate shell, which is accommodated in the housing inner cavity 41; the high-voltage plate shell is used to accommodate the high-voltage plate.

[0054] In some embodiments, the high-voltage plate shell is housed in the housing inner cavity 41 of the circuit breaker. The housing inner cavity 41 is a space inside the housing box 4, which is specially designed to place key components of the circuit breaker, such as the pole, high-voltage plate, etc. The main function of the high-voltage plate shell is to house the high-voltage plate. The high-voltage plate is an important part of the circuit breaker, which usually includes a conductive plate for connecting the circuit and related electrical connection points. The function of the high-voltage plate is to carry and distribute high-voltage current and ensure reliable connection of the circuit. The first pole 2 and the second pole 3 are placed on the same side of the housing box 4, and the high-voltage plate shell is housed in the housing inner cavity 41 of the housing box 4. This layout helps to optimize space utilization while maintaining a reasonable distance between components for ease of maintenance and operation. The high-voltage plate shell not only protects the high-voltage plate, but also provides additional safety protection for internal components through the design of the insulating shell, preventing failures caused by external environmental factors such as moisture, dust, mechanical impact, etc.

[0055] In this way, the double-pole circuit breaker adopts a design of the first pole 2 and the second pole 3 in parallel, and both are homopolar poles, which effectively improves the current handling capacity of the circuit breaker and the reliability of circuit protection. Due to the parallel connection, the two poles can jointly bear the circuit load, distribute the pressure of a single pole, and reduce the risk of failure. At the same time, the arrangement of homopolar poles ensures synchronous operation and improves the consistency of the circuit breaker action. In addition, the design of the high-voltage plate shell houses the high-voltage plate in the internal housing inner cavity 41 of the circuit breaker, which not only provides mechanical protection for the high-voltage plate and its connected components, but also enhances the electrical insulation performance, preventing the influence of external environmental factors on the internal circuit, thereby ensuring the stable operation and long-term reliability of the circuit breaker in complex environments.

[0056] In some embodiments, the first pole 2 includes a first operating mechanism, and the second pole includes a second operating mechanism; the operation controller includes a first operation controller and a second operation controller; the first operating mechanism is connected with the first operation controller, and the second operating mechanism is connected with the second operation controller; the first operating mechanism is used to open and close under the control of the first operation controller according to the control information; and the second operating mechanism is used to open and close under the control of the second operation controller according to the control information.

[0057] In some embodiments, each pole column has a corresponding operating mechanism for controlling the opening and closing operation of the first pole column 2 and the second pole column 3 respectively. The operating mechanism usually includes mechanical driving components such as motors or spring mechanisms for performing the opening or closing action. The first operating controller and the second operating controller are two independent control units connected to the operating mechanism of the first pole column 2 and the second pole column 3 respectively. They receive signals from the external control system and convert them into mechanical actions to control the opening and closing of the pole columns. The first operating mechanism is connected to the first operating controller, and the second operating mechanism is connected to the second operating controller. This connection ensures that the control signals can be accurately transmitted to the corresponding operating mechanism. Under the control of the first operating controller, the first operating mechanism performs the corresponding action according to the received control information (e.g., opening or closing command). Similarly, the second operating mechanism performs the opening and closing operation according to the received control information under the control of the second operating controller.

[0058] In this way, the parallel design of the double pole columns and the setting of the in-phase pole columns ensure that the two pole columns can operate synchronously, improving the current handling capacity of the circuit breaker and the reliability of circuit protection. Secondly, each pole column has independent operating mechanism and control unit, which not only provides higher redundancy, but also makes the control of the circuit breaker more flexible and accurate. The first operating mechanism and the second operating mechanism are connected to the corresponding operating controller, and can perform opening and closing under the control of the first operating controller and the second operating controller according to the received control information. This design improves the stable operation and long-term reliability of the circuit breaker in complex environments. Overall, the design of the double pole column circuit breaker optimizes the performance of the circuit breaker, improves the safety of the system and the convenience of maintenance, so that the circuit breaker can provide efficient and stable protection in various working conditions.

[0059] The following will be combined with Figure 4 , Figure 4 is a schematic diagram of a series compensation circuit provided by an embodiment of the present application, which illustrates an exemplary application and implementation of the series compensation circuit provided by the embodiment of the present application.

[0060] In some embodiments, the series compensation circuit provided by the embodiments of the present application includes: a double-pole breaker, the double-pole breaker includes a first pole (QF1) and a second pole (QF2), the first pole (QF1) and the second pole (QF2) in the double-pole breaker are connected in parallel, wherein the first pole (QF1) and the second pole (QF2) are in-phase poles; a series compensation capacitor (C), the series compensation capacitor is connected in parallel with the first pole (QF1) and the second pole (QF2); a damping branch, the damping branch is connected in series with the first pole (QF1) and connected in parallel with the second pole (QF2), the first pole (QF1) is used as a fast switch in the series compensation circuit, and the second pole is used as a bypass switch in the series compensation circuit.

[0061] In some embodiments, the series compensation capacitor is connected in parallel with the first pole (QF1) and the second pole (QF2), which means that the capacitor is connected in the circuit between the two poles, and the damping branch is connected in series with the first pole (QF1) and in parallel with the second pole. This means that the damping branch is connected in the circuit path of the first pole 2, while the second pole (QF2) is also connected in parallel. The first pole (QF1) is used as a fast switch in the series compensation circuit, and the first pole (QF2) is responsible for quickly cutting off or turning on the circuit, especially in situations that require fast response, such as short circuit or overload. The second pole is used as a bypass switch in the series compensation circuit, and the second pole (QF2) can provide a bypass when the first pole (QF1) is in the off state, so that the current can continue to flow through the capacitor, thereby stabilizing the circuit. The bypass switch design of the second pole can provide a bypass path for the current when necessary, ensuring the continuity and stability of the circuit. The damping branch can absorb excess energy in the circuit, reduce arc and voltage fluctuation during switching operation, and improve the service life and reliability of the switch.

[0062] In some embodiments, the series compensation circuit includes a voltage limiter (MOV) connected in parallel with the series compensation capacitor (C), each of the second poles (QF2), and each of the first poles (QF1).

[0063] In some embodiments, the voltage limiter, also known as metal oxide varistor (MOV), is a protective device used to limit voltage peaks, which can protect circuits and devices from damage under overvoltage conditions. The voltage limiter is connected in parallel with the series compensation capacitor to form a protection circuit together to limit the voltage across the capacitor. The voltage limiter is also connected in parallel with the first pole (QF1) and the second pole (QF2) of each double-pole breaker to provide additional overvoltage protection.

[0064] In some embodiments, the series compensation capacitor is a compensation device used in power systems that improves the power factor and voltage stability of the system by providing a capacitive response to compensate for the inductive response of the system. The series compensation capacitor is connected in parallel with the first pole (QF1) to compensate for the inductive load of the first pole (QF1). The series compensation capacitor is also connected in parallel with the second pole (QF2) to compensate for the inductive load of the second pole.

[0065] In this way, by configuring each double-pole circuit breaker as a control unit for one phase of the power system, independent control and protection of the current of each phase of the system is achieved, thereby improving the stability and reliability of the system. The first pole (QF1) and the second pole (QF2) of the double-pole circuit breaker are connected in parallel, not only enhancing the current handling capacity, but also providing fault redundancy, ensuring that even if a problem occurs in one pole, the other pole can still maintain the operation of the circuit. The independence of each circuit breaker unit in the circuit breaker group makes maintenance and replacement operations more convenient, while reducing mutual interference between units. In addition, the series compensation capacitor is connected in parallel with the first pole (QF1) and the second pole (QF2), which helps to improve the power factor and voltage stability of the system, while the voltage limiter is connected in parallel with the capacitor and the pole, further improving the overvoltage protection capability of the system. Overall, this design not only optimizes the performance of the power system, but also improves the safety and maintainability of the system, providing strong support for the long-term stable operation of the power system.

[0066] In some embodiments, the series compensation circuit includes a current sensor (TA) connected in series with the voltage limiter, the current sensor connected in parallel with each first pole (QF1), and the current sensor connected in parallel with each second pole (QF2). A voltage sensor (TV) connected in parallel with the current sensor, the voltage sensor connected in parallel with each first pole (QF1), and the voltage sensor connected in parallel with each second pole.

[0067] In some embodiments, the series compensation circuit refers to a circuit used in power systems to compensate for circuit parameters such as inductance, capacitance, or resistance, with the purpose of improving the power factor, stability, and transmission efficiency of the system. In such a circuit, various electrical elements are usually included to achieve fine adjustment of circuit performance. The damping branch (RL) is a component of the series compensation circuit, which functions to form a resonance with the capacitance in the circuit while providing damping to reduce oscillation of the circuit. The damping branch is connected in series with the first pole (QF1) of each double-pole circuit breaker, so that appropriate compensation can be provided for each phase, and the damping branch is also connected in parallel with the second pole (QF2) of each double-pole circuit breaker, which helps to balance the electrical performance of the parallel branches.

[0068] In some embodiments, the current sensor is a device that detects and monitors the current in the circuit, typically for protection, control, and detection purposes. The current sensor is connected in series with the voltage limiter, which allows it to monitor the current flowing through the voltage limiter in real time, and respond to overcurrent conditions. The current sensor is also connected in parallel with the first pole (QF1) of each double-pole circuit breaker, which allows it to monitor the current in each phase independently. Similarly, the current sensor is also connected in parallel with the second pole of each double-pole circuit breaker, which allows it to monitor the current in the parallel branch.

[0069] In some embodiments, the voltage sensor is a device that measures the voltage in the circuit, which can provide a voltage signal for protection and control of the circuit. The voltage sensor is connected in parallel with the current sensor, which allows it to monitor the voltage and current in the circuit simultaneously, providing more comprehensive data for the system. The voltage sensor is connected in parallel with the first pole (QF1) of each double-pole circuit breaker, which allows it to monitor the voltage in each phase independently. The voltage sensor is also connected in parallel with the second pole of each double-pole circuit breaker, which allows it to monitor the voltage in the parallel branch.

[0070] As an example, see the series compensation circuit shown in Figure 4 , Figure 4 The series compensation circuit includes a damping branch (RL) connected in series with each first pole (QF1) and connected in parallel with each second pole (QF2). A current sensor (TA) is connected in series with the voltage limiter and connected in parallel with each first pole (QF1) and each second pole (QF2). A voltage sensor (TV) is connected in parallel with the current sensor and connected in parallel with each first pole (QF1) and each second pole (QF2).

[0071] Thus, by connecting the first pole column (QF1) and the second pole column (QF2) in parallel, each double-pole circuit breaker can independently control the current of one phase, thereby improving the reliability and redundancy of the circuit and ensuring that the other pole column can continue to work when a fault occurs in a certain pole column. Secondly, the design of the double-pole circuit breaker, in which the circuit breaker units are not connected to each other, makes maintenance and replacement more convenient, while also reducing mutual interference between units. The application of series compensation capacitors in parallel with the first pole column (QF1) and the second pole column (QF2) effectively compensates for the inductance of the line, improving the power factor and stability of the system. The addition of voltage limiters (MOV) in parallel with the series compensation capacitors and in parallel with the first pole column and the second pole column provides additional overvoltage protection, protecting the circuit and equipment from voltage fluctuations. In addition, the damping branch (RL) in the series compensation circuit, which is connected in series with the first pole column and in parallel with the second pole column, helps to suppress oscillations in the circuit, ensuring the smooth operation of the circuit. The integration of current sensors (TA) and voltage sensors (TV) enables real-time detection of current and voltage, providing accurate signals to protection devices, thereby improving the detection capability and protection level of the entire series compensation circuit, significantly enhancing the stability and safety of the power system, reducing maintenance costs, and improving the reliability of power supply.

[0072] In some embodiments, the double-pole circuit breaker includes an operation controller and a high-voltage board, and the series compensation circuit includes a general controller and a signal aggregation board, the general controller being connected to the signal aggregation board; the signal aggregation board is in communication connection with the high-voltage board, the high-voltage board is connected to the operation controller in the double-pole circuit breaker; the operation controller is used to obtain state information of the first pole column 2 and the second pole column 3; the high-voltage board is used to obtain the state information sent by the operation controller and send the state information to the signal aggregation board, and the signal aggregation board sends the state information to the general controller; the general controller is used to generate control information based on the state information and send the control information to the high-voltage board through the signal aggregation board; the high-voltage board is also used to send the control information to the operation controller, and the operation controller is used to control the first pole column and / or the second pole column based on the control information.

[0073] In some embodiments, the operating controller is used to control the operation of the pole columns, while the high voltage board is an interface connecting various components. The series compensation circuit also includes a master controller and a signal aggregation board. The master controller is the core of the control system, responsible for generating control information. The master controller is connected to the signal aggregation board. The signal aggregation board is in communication with the high voltage board and receives status information sent by the high voltage board. The high voltage board is connected to the operating controller in the bipolar column circuit breaker for obtaining and sending status information. The operating controller is used to obtain the status information of the first pole column and the second pole column, i.e. their opening and closing states. The high voltage board obtains the status information from the operating controller and sends it to the signal aggregation board. The signal aggregation board aggregates all the status information and transmits it to the master controller. The master controller generates corresponding control information according to the received status information. The master controller sends the control information to the high voltage board through the signal aggregation board. The high voltage board sends the control information to the operating controller, and the operating controller controls the opening and closing operation of the first pole column and / or the second pole column according to the control information.

[0074] In some embodiments, the master controller is the core control unit in the series compensation circuit, which is responsible for monitoring the running state of the circuit and generating control instructions according to these information. Collect status information from the signal aggregation board. Analyze these status information to determine whether the circuit is running normally. If an abnormality is detected, the master controller can generate control information to adjust the circuit operation. The master controller sends the generated control information to the signal aggregation board for further processing and transmission.

[0075] In some embodiments, the signal aggregation board is an intermediate piece connecting the master controller and other components in the circuit, which is responsible for collecting information from various parts and transmitting these information to the master controller. Receive status information sent by the operating controller, which usually includes the opening and closing states of the first pole column and the second pole column. Transmit these status information to the master controller for monitoring and analysis. Receive control information from the master controller and transmit it to the high voltage board. In communication with the high voltage board to ensure that the control information can be effectively transmitted to the operating controller.

[0076] In some embodiments, the operating controller continuously collects status information of the first pole column and the second pole column and sends it to the signal aggregation board through the high voltage board. The signal aggregation board sends the status information to the master controller after aggregation. The master controller analyzes these status information and generates corresponding control information if an abnormality or adjustment is detected. The master controller sends the control information to the high voltage board through the signal aggregation board. After receiving the control information, the high voltage board transmits it to the operating controller, and the operating controller controls the opening and closing operation of the first pole column and / or the second pole column accordingly.

[0077] In some embodiments, the series compensation circuit includes a double isolation switch, the series compensation capacitor is connected in parallel with the second pole through the double isolation switch, and the first pole and the second pole are used for redundant protection of the series compensation capacitor and the voltage limiter.

[0078] In some embodiments, in the series compensation circuit, a double isolation switch is used to isolate different parts of the circuit to ensure safe operation. It can provide physical isolation of circuit components when the circuit is not powered on. The series compensation capacitor is a passive element used to improve the power factor of the circuit, which compensates for the reactive demand of the circuit by absorbing reactive power in the circuit. The series compensation capacitor is connected in parallel with the second pole through the double isolation switch. This connection allows safe isolation of the capacitor when needed, while maintaining the connection of the capacitor to the circuit. The first pole and the second pole are used together for redundant protection of the series compensation capacitor and the voltage limiter. Redundant protection means that the circuit has two independent protection paths to increase the reliability and safety of the system.

[0079] In some embodiments, the series compensation circuit includes a plurality of support insulators, each of which is connected to the double-pole circuit breaker, the series compensation capacitor, and the damping branch, respectively, wherein each of the support insulators is a 35KV support insulator.

[0080] In some embodiments, the support insulator is also connected to the voltage limiter, and the support insulator is an element used to support and insulate circuit conductors, and each support insulator is a 35KV support insulator, which means it is designed to withstand at least 35 kilovolts of voltage. Each support insulator is connected to the double-pole circuit breaker, the series compensation capacitor, the damping branch, and the voltage limiter. This connection ensures electrical isolation between parts of the circuit while being able to withstand high voltage. Since 35KV support insulators are used, they provide sufficient insulation capacity to prevent current leakage and ensure safe operation. The use of support insulators ensures that there is enough insulation distance between conductors in the circuit to prevent potential electrical faults and short circuits. The design of the 35KV support insulator allows it to withstand high voltage, which is crucial for the stable operation of the series compensation circuit in a high-voltage environment. By connecting the support insulator to the circuit breaker, it ensures that the switch unit can safely withstand high voltage when operating. The connection of the capacitor to the support insulator ensures electrical stability and safety during reactive power compensation. The connection of the support insulator to the damping branch helps to effectively suppress oscillations in the circuit. The connection of the support insulator to the voltage limiter ensures that the voltage in the circuit is within an acceptable safety range.

[0081] In some embodiments, the support insulator is a key component used in power systems, its main function is to support and fix the cable or conductor in a high voltage environment, while providing the necessary electrical isolation. In series compensation circuit, the support insulator is usually designed for 35KV level, which means it can withstand at least 35kV voltage. These insulators hang the high voltage cable or conductor on the support or tower, and ensure that there is enough insulation distance between the cable or conductor and the support, ground or adjacent conductor, to prevent arc discharge or short circuit phenomenon. In addition, the support insulator is also connected with other components in the circuit, such as the bipolar pole circuit breaker, series compensation capacitor, damping branch and voltage limiter, to form a complete circuit. In this way, the support insulator not only provides physical support for the circuit, but also plays a role in electrical isolation and protection.

[0082] Therefore, in the series compensation circuit, multiple 35KV support insulators are used to connect the bipolar pole circuit breaker, series compensation capacitor, damping branch and voltage limiter, which are designed to improve the electrical performance, safety and reliability of the circuit. Through such configuration, the circuit can operate stably in a high voltage environment, while providing multiple protection mechanisms to ensure safe operation of the circuit under normal and abnormal conditions.

[0083] In some embodiments, the total controller is the core control unit in the bipolar pole circuit breaker system, responsible for managing and coordinating the operation of all bipolar pole circuit breakers in the system. In the series compensation circuit, the total controller is connected with the operation controllers in each bipolar pole circuit breaker, forming a centralized control network. The main function of the total controller is to receive instructions from the upper control system or user interface, and according to the system requirements and real-time feedback, send control signals to each operation controller to realize synchronous or asynchronous operation of the bipolar pole circuit breaker. In this way, the total controller can ensure the stable operation of the power system, while optimizing the performance and protection of the circuit, and improving the overall automation level and intelligent degree of the system. The total controller usually has advanced algorithms and decision logic, which can handle complex situations and respond quickly to adapt to the changing working conditions of the power system.

[0084] In some embodiments, one of the poles of the bipolar pole circuit breaker is used as a fast switch (such as QF1 shown in Figure 4 ), and the other pole is used as a bypass switch (such as QF2 shown in Figure 4 ). Due to the change in structure, the control logic needs to be adapted, and the present application also proposes a new opening and closing control logic suitable for the above structure. The high voltage board uses waterproof interface for external fiber interface and waterproof connector for power supply. The CT uses aviation connector and the PT uses aviation connector. The high voltage board shell is made of metal material, and the installation shell is as shown in Figure 5 , and the Figure 5This is a schematic diagram of the high-voltage board housing provided in an embodiment of this application. The high-voltage board, housed in the aforementioned metal housing, is assembled with the controller within the receiving cavity of the electrode post. Signal lines are led out and electrically connected to the controller. Simultaneously, information communication is achieved via optical fiber with the main controller (signal aggregation board of the terminal and Senbao control board). The aforementioned high-voltage board housing adopts a flat rectangular design, effectively utilizing limited installation space and facilitating installation and maintenance in confined or shape-restricted areas. The flat design increases surface area, which is beneficial for heat dissipation, and the regular shape facilitates fixing and installation, allowing for easy integration into existing equipment or systems. The metal housing effectively blocks external electromagnetic interference, prevents leakage of electromagnetic signals within the high-voltage board, and reduces the impact on surrounding equipment.

[0085] In some embodiments, see Figure 6 , Figure 6 This is a schematic diagram of the control logic of the main controller provided in an embodiment of this application. The five input signals are the QF1 open, QF1 closed, QF2 open, QF2 closed position signals and the QF1 energy storage signal. For example, Figure 6 The five input signals of the A-phase high-voltage board shown are: AR1 indicates that the fast switch QF1 is in the open position; AR2 indicates that the fast switch QF1 is in the closed position; AR3 indicates that the bypass switch QF2 is in the open position; AR4 indicates that the bypass switch QF4 is in the closed position; and AR4 is the energy storage signal for phase A, which indicates the energy storage status. Opening can only be performed when energy storage is complete. The four output signals are the QF1 open signal, QF1 closed signal, QF2 open signal, and QF2 closed signal, respectively. These output signals are given based on the input signals from the circuit breaker's high-voltage board, and their control logic is determined by... Figure 6 The Senbao control board shown in the diagram executes the following: The three-phase high-voltage boards A, B, and C collect the status information (i.e., input signals) of the fast switch QF1 and bypass switch QF2 to the signal aggregation board. The signal aggregation board then transmits this status information to the Senbao control board, which controls the circuit according to the following logic to obtain feedback signals (i.e., output signals). These output signals are then fed back to the signal aggregation board, which transmits them to each high-voltage board. This allows the high-voltage board to send information to the controller, controlling the opening and closing of the fast switch QF1 and / or bypass switch QF2. Simultaneously, all the above signals are transmitted via optical fiber to meet insulation requirements. The control logic is as follows:

[0086] (1) The first pole (QF1) tripping status signal is a logical "AND" relationship. The controller considers QF1 to be in tripping state only when A1, B1, and C1 are all in the tripping position.

[0087] (2) The closing status signal of the first pole (QF1) is a logical "AND" relationship. The controller considers QF1 to be in the closed state only when A1, B1 and C1 are all in the closed position.

[0088] (3) The second pole column (QF2) opening state signal is a logical "and" relationship, and the controller considers that QF2 is open when A2, B2, and C2 are all in the open position;

[0089] (4) The second pole column (QF2) closing state signal is a logical "and" relationship, and the controller considers that QF2 is closed when A2, B2, and C2 are all in the closed position;

[0090] (5) The first pole column (QF1) energy storage completion state signal is a logical "and" relationship, and the controller considers that QF1 is in the energy storage state when A1, B1, and C1 are all energy storage completed. Both the input and output quantities are passive nodes.

[0091] The embodiment of the application increases the distance between the three-phase circuit breakers by arranging the A, B, and C three-phase circuit breakers separately, so as to meet the higher insulation requirement of the 35KV voltage level, thereby reducing the risk of inter-phase short circuit. Meanwhile, each pole column is changed from one to two, one pole column is used as a fast switch, and the other pole column is used as a bypass switch, thereby reducing the volume of the whole series compensation. Through the optimized design, the embodiment of the application controls the cost without sacrificing the performance, so that the 35KV series compensation device is more economical.

[0092] The structure of the switch in the 10KV series compensation of the embodiment of the application is improved to meet the insulation requirement and line safety. The 35kv supporting insulator is used for the ground insulation of all devices. For the primary and secondary electrical signals, the analog quantity is converted into digital quantity, and then the digital quantity is converted into optical signals for signal transmission and insulation through the optical fiber.

[0093] In some embodiments, as shown in Figure 4 , Figure 4 The series compensation circuit includes a series compensation main capacitor C, a zinc oxide voltage limiter MOV, a damping branch resistor R, a damping branch L, a current transformer TA, a voltage transformer TV, a disconnecting switch QS, and a second pole column QF2. The two ends of the second pole column QF2 are connected with power transmission lines at both ends of the series compensation device. The series compensation main capacitor C is connected with the power transmission lines through the double disconnecting switch QS and is connected in parallel with the second pole column QF2. The voltage transformer TV is connected in parallel at both ends of the series compensation main capacitor C. The zinc oxide voltage limiter MOV is connected in series with the current transformer TA and is connected in parallel with the series compensation main capacitor C. The damping branch resistor R and the damping branch L are connected in parallel, one end of which is connected with the current transformer TA, and the other end is connected with the first pole column QF1. The other end of the first pole column QF1 is connected with the zinc oxide voltage limiter MOV.

[0094] In some embodiments, as shown in Figure 4, the first pole QF1 and the second pole QF2 are the first pole QF1 and the second pole QF2 for realizing the redundant protection of the main capacitor C and the zinc oxide voltage limiter MOV in the device.

[0095] In some embodiments, referring to Figure 4 , the current transformer TA is a current transformer TA connected in series in the branch of the zinc oxide voltage limiter MOV for realizing the fast protection.

[0096] In some embodiments, referring to Figure 4 , the disconnector QS is a disconnector QS for maintenance.

[0097] In some embodiments, referring to Figure 4 , the second pole QF2 is the second pole QF2 for realizing the automatic control and the remote control of the bypass branch.

[0098] In some embodiments, referring to Figure 4 , in the figure, QF is a line outgoing circuit breaker, QF1 is a first pole, QF2 is a second pole, C is a main capacitor, and MOV is a zinc oxide voltage limiter. The first pole adopts a special circuit breaker with a closing time ≤10 ms, and the second pole adopts a permanent magnet mechanism fast circuit breaker with a closing time ≤40 ms. The fast and slow cooperation of the closing times of the two circuit breakers is used to realize the redundant protection. The principle of the redundant protection is as follows: the closing time of the first pole QF1 is less than the closing time of the second pole QF2. In the operation process of the series compensation device, if an inter-phase short circuit (two-phase or three-phase short circuit) occurs in the line behind, the MOV first limits the voltage rise at both ends of the main capacitor C caused by the short circuit without time delay, and QF1 and QF2 start to close, bypassing the main capacitor and the MOV within 10 ms, and completing the protection of the capacitor and the MOV. When CB1 is correctly closed, QF2 still completes the closing operation but does not play a protection role. When QF1 refuses to operate, QF2 ensures that the protection of the main capacitor and the MOV is completed within 40 ms, playing a redundant protection role. Since the operating mechanisms of the two circuit breakers are completely independent, the use of double circuit breakers to realize the redundant protection can greatly improve the reliability of the protection. In principle, the reliability of the double circuit breaker protection is doubled compared with that of the single circuit breaker.

[0099] In some embodiments, the series compensation capacitor is connected in parallel with the second pole through double disconnectors (QS), and the first pole and the second pole are used for redundant protection of the series compensation capacitor and the voltage limiter.

[0100] In some embodiments, the double isolation switch is a switch device that can be manually or electrically operated to isolate a certain part of the circuit from the power supply or load, facilitating maintenance or safely disconnecting the circuit. In this design, the series compensation capacitor is connected in parallel with the second pole through the double isolation switch, so that when maintenance or inspection of the series compensation capacitor is needed, it can be safely disconnected from the circuit without affecting the operation of other parts. If the series compensation capacitor or the voltage limiter connected in parallel with it fails, the first pole and the second pole can act independently or simultaneously to isolate the faulty part and prevent the fault from spreading to the entire circuit. The redundant design also means that under normal circumstances, the two poles can share the load, thereby extending the service life of the components and reducing the risk of single-point failure. The double-pole circuit breaker improves the protection level of the series compensation capacitor and the voltage limiter through the redundant configuration of the double isolation switch and the poles, enhances the reliability and safety of the power system, and also provides convenience for maintenance and troubleshooting of the system.

[0101] In this way, the design of connecting the series compensation capacitor in parallel with the second pole through the double isolation switch (QS) and the redundant protection of the series compensation capacitor and the voltage limiter by the first pole and the second pole effectively improves the reliability and safety of the power system. This configuration provides double insurance for the system when facing failures, and when one pole fails, the other pole can intervene in time to ensure the continuity of power supply. At the same time, the double isolation switch makes maintenance safer and more convenient, allowing maintenance or replacement of the compensation capacitor without affecting system operation, greatly improving system maintenance efficiency and extending equipment service life, thereby providing strong support for efficient and stable operation of the power system.

[0102] Therefore, the distance between each pole of the three-phase three-pole circuit breaker in the traditional 10KV series compensation circuit is short, which is prone to cause inter-phase short circuit, and thus cannot meet the insulation requirement in the 35KV scenario. Therefore, the three-phase three-pole circuit breaker in the traditional 10KV series compensation circuit is replaced by a two-pole circuit breaker without changing other components (series compensation capacitor and damping branch) in the traditional 10KV series compensation circuit. Since the two-pole circuit breaker includes a first pole and a second pole, the first pole and the second pole in the two-pole circuit breaker are connected in parallel. By replacing the three-phase three-pole circuit breaker with the two-pole circuit breaker, the insulation requirement can be improved without changing the distance between the poles, so that the series compensation circuit provided in the embodiments of the present application can adapt to the 10KV and 35KV scenarios at the same time without changing the overall size of the circuit on the basis of the traditional 10KV series compensation circuit, thereby effectively improving the scene universality of the series compensation circuit. At the same time, since the components of the traditional 35KV series compensation circuit are usually larger and thicker than those of the traditional 10KV series compensation circuit, the series compensation circuit provided in the embodiments of the present application can have an overall size comparable to that of the traditional 10KV series compensation circuit, and thus has a significantly lower manufacturing cost than the traditional 35KV series compensation circuit, while being able to meet the insulation requirement in the 35KV scenario, thereby effectively reducing the manufacturing cost of the series compensation circuit. Therefore, the series compensation circuit provided in the embodiments of the present application can effectively improve the scene universality of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit.

[0103] In some embodiments, a 35kv power transmission line includes three groups of series compensation circuits, a first group of the series compensation circuits is connected to an A-phase circuit of the power transmission line, a second group of the series compensation circuits is connected to a B-phase circuit of the power transmission line, and a third group of the series compensation circuits is connected to a C-phase circuit of the power transmission line.

[0104] In some embodiments, a 35KV power transmission line includes three sets of series compensation circuits, each set connected to one of the three phases (A, B, C) of the transmission line. This configuration helps improve the power factor and stability of the transmission line, reduces reactive power loss, and improves voltage quality. Each set of compensation circuits consists of series compensation capacitors, damping branches, pole breakers, support insulators, and other necessary protective elements. The first set of series compensation circuits is connected to the A phase, the second set to the B phase, and the third set to the C phase. This connection ensures that each phase can independently compensate for reactive power. By configuring series compensation circuits on each phase, three-phase current balance can be achieved, reducing energy loss and equipment damage caused by three-phase imbalance. Series compensation capacitors provide the necessary reactive power, improving the power factor of the transmission line. This helps reduce energy loss and improve transmission efficiency. Series compensation capacitors help stabilize voltage, reduce voltage fluctuations and flicker, and improve power supply quality. Pole breakers and support insulators provide protection for series compensation capacitors, ensuring safe operation of the circuit in the event of failure or abnormality. Damping branches help suppress oscillations and overvoltages in the circuit, improving circuit stability. Since each set of compensation circuits is independent, the compensation capacity of each phase can be adjusted as needed, providing high flexibility and scalability.

[0105] In some embodiments, by installing series compensation circuits on each phase, independent control of three-phase current can be achieved, helping to maintain three-phase balance and reduce energy loss and equipment stress caused by imbalance. Series compensation circuits typically contain capacitors that provide or absorb reactive power, improving the power factor of the system. In the case of three-phase full compensation, the reactive power demand of the power grid can be effectively reduced. Series compensation circuits can help regulate the voltage of the transmission line, reduce voltage fluctuations, and improve voltage stability, which is crucial for protecting downstream loads and improving power supply quality. Improving the power factor can reduce the loss of the transmission line, thereby reducing energy costs. At the same time, due to the more stable system, the frequency of maintenance and repair may be reduced. The independent compensation circuit of each phase provides flexibility, allowing adjustments to be made according to the specific needs of each phase to optimize the performance of the overall system. Series compensation circuits are usually used with protective devices such as breakers to quickly isolate problems and protect the entire system in the event of a failure.

[0106] In this way, the configuration of the three-phase full compensation helps to maintain the balance of three-phase current, reduce energy loss and equipment damage caused by imbalance. Secondly, the series compensation circuit can provide or absorb reactive power, effectively improve the power factor of the system, reduce the loss of transmission line, and save energy cost. In addition, the series compensation circuit can also adjust and stabilize the voltage, reduce voltage fluctuation, improve power supply quality, and protect downstream loads. By compensating for reactive power, the stability of the power system can also be improved, reducing the risk of system failure. Finally, this configuration provides flexibility, allowing adjustments according to the specific needs of each phase to optimize the overall system performance. In summary, the configuration of the series compensation circuit realizes the dual improvement of power transmission efficiency and system performance in the 35KV transmission line.

[0107] In some embodiments, the redundant protection characteristics test of the compensation circuit is implemented as follows: short-circuit fast redundant protection test: apply a simulated short-circuit current (flowing through the MOV element) to the current transformer primary side of the MOV branch, check whether the double fast circuit breaker simultaneously starts closing and completes the closing operation according to the designed time sequence, then open the closing coil of the first fast circuit breaker to simulate refusal, apply a simulated short-circuit current to the current transformer primary side of the MOV branch again, and check whether the second fast circuit breaker completes closing within the specified time; overcurrent redundant protection test: apply a current to the primary side of the main circuit current transformer to reach the overcurrent protection action setting value, check whether the double fast circuit breaker simultaneously starts closing and completes the closing operation according to the designed time sequence, then open the closing coil of the first fast circuit breaker to simulate refusal, apply a current to the primary side of the main circuit current transformer again to reach the overcurrent protection action setting value, and check whether the second fast circuit breaker completes closing within the specified time; overvoltage redundant protection test: apply a voltage to the primary side of the voltage transformer to reach the device overvoltage protection action setting value, check whether the double fast circuit breaker simultaneously starts closing and completes the closing operation according to the designed time sequence, then open the closing coil of the first fast circuit breaker to simulate refusal, apply a voltage to the primary side of the voltage transformer again to reach the device overvoltage protection action setting value, and check whether the second fast circuit breaker completes closing within the specified time; resonance redundant protection test: apply harmonic voltage and current to the voltage and current circuits respectively, and make them reach the harmonic protection action setting value, check whether the double fast circuit breaker simultaneously starts closing and completes the closing operation according to the designed time sequence, then open the closing coil of the first fast circuit breaker to simulate refusal, apply harmonic voltage and current to the voltage and current circuits respectively again, and make them reach the harmonic protection action setting value, and check whether the second fast circuit breaker completes closing within the specified time.

[0108] In summary, the embodiments of the present application have the following beneficial effects:

[0109] (1) Since the distance between each pole of the three-phase three-pole circuit breaker in the traditional 10KV series compensation circuit is short, it is easy to cause inter-phase short circuit, therefore, it cannot meet the insulation requirement in the 35KV scene, therefore, the three-phase three-pole circuit breaker in the traditional 10KV series compensation circuit is updated to a two-pole circuit breaker, without changing other components (series compensation capacitor and damping branch) in the traditional 10KV series compensation circuit, since the two-pole circuit breaker includes a first pole and a second pole, the first pole and the second pole in the two-pole circuit breaker are in parallel, by replacing the three-phase three-pole circuit breaker with the two-pole circuit breaker, the insulation requirement can be improved without changing the distance between the poles, so that the series compensation circuit provided by the embodiment of the application can adapt to the scenes of 10KV and 35KV at the same time without changing the overall volume of the circuit on the basis of the traditional 10KV series compensation circuit, thereby effectively improving the scene universality of the series compensation circuit. At the same time, since the components of the traditional 35KV series compensation circuit are usually larger and thicker than those of the traditional 10KV series compensation circuit, the series compensation circuit provided by the embodiment of the application can have an overall volume comparable to that of the traditional 10KV series compensation circuit, therefore, the manufacturing cost is significantly lower than that of the traditional 35KV series compensation circuit, while it can meet the insulation requirement in the 35KV scene, thereby effectively reducing the manufacturing cost of the series compensation circuit. Therefore, the series compensation circuit provided by the embodiment of the application can effectively improve the scene universality of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit.

[0110] (2) Parallel configuration provides fault redundancy, even if one pole fails, the other pole can still maintain the continuity of the circuit, thereby reducing the risk of system interruption. Two poles can share the current load together, which means that the circuit breaker can handle larger current, improving its applicability and performance. Since the poles are installed at equal intervals, it provides convenience for maintenance and replacement. Workers can more easily access and operate each pole. The equal interval layout on the insulating base helps to optimize space utilization, making the circuit breaker structure more compact and saving installation space. The use of insulating base ensures the isolation between the poles and the ground or other conductive components, reducing the risk of electrical failure and improving the safety of operation. The design of the two-pole circuit breaker not only improves the performance and reliability of the circuit breaker, but also enhances the safety and convenience of maintenance, providing important protection for the stable operation of the power system.

[0111] (3) By connecting the first pole (QF1) and the second pole (QF2) in parallel, each double-pole circuit breaker can independently control one phase current, thereby improving the reliability and redundancy of the circuit, ensuring that the other pole can continue to work when a fault occurs in a certain pole. Secondly, the design of the double-pole circuit breaker, in which each circuit breaker unit is not connected to each other, makes maintenance and replacement more convenient, while also reducing the mutual interference between units. The application of series compensation capacitors in parallel with the first pole (QF1) and the second pole (QF2) effectively compensates the inductance of the line, improving the power factor and stability of the system. The addition of voltage limiters (MOV) in parallel with the series compensation capacitors and in parallel with the first pole and the second pole provides additional overvoltage protection, protecting the circuit and equipment from voltage fluctuations. In addition, the damping branch (RL) in the series compensation circuit is connected in series with the first pole and in parallel with the second pole, which helps to suppress oscillations in the circuit and ensure the smooth operation of the circuit. The integration of current sensors (TA) and voltage sensors (TV) enables real-time detection of current and voltage, providing accurate signals for protection devices, thereby improving the detection capability and protection level of the entire series compensation circuit, significantly enhancing the stability and safety of the power system, reducing maintenance costs, and improving the reliability of power supply.

[0112] (4) By configuring each double-pole circuit breaker as a control unit for one phase of electricity, independent control and protection of each phase current of the power system is achieved, thereby improving the stability and reliability of the system. The parallel connection of the first pole and the second pole in the double-pole circuit breaker not only enhances the current handling capacity, but also provides fault redundancy, ensuring that even if a problem occurs in a certain pole, the other pole can still maintain the operation of the circuit. The independence of each circuit breaker unit in the circuit breaker group makes maintenance and replacement operations more convenient, while reducing mutual interference between units. In addition, the series compensation capacitors in parallel with the first pole and the second pole help to improve the power factor and voltage stability of the system, while the voltage limiters in parallel with the capacitors and in parallel with the poles further improve the overvoltage protection capability of the system. Overall, this design not only optimizes the performance of the power system, but also improves the safety and maintainability of the system, providing strong support for the long-term stable operation of the power system.

[0113] (5) Double-pole circuit breaker, including two parallel and same-phase poles, and a controller for controlling operation and a board for carrying high-voltage current. The operation controller is connected to the double-pole circuit breaker through the high-voltage board, so that the circuit breaker can perform opening or closing operations according to the instructions of the operation controller. Such a design makes the circuit breaker reliable and efficient, suitable for handling protection tasks of high-voltage circuits.

[0114] (6) The bipolar pole circuit breaker adopts a design of first pole and second pole in parallel, and both are homophase poles. This structure effectively improves the current handling capacity of the circuit breaker and the reliability of circuit protection. Due to parallel connection, two poles can jointly bear the circuit load, disperse the pressure of single pole, and reduce the risk of failure. At the same time, the setting of homophase poles ensures synchronous operation and improves the action consistency of the circuit breaker. In addition, the design of high-voltage plate shell accommodates the high-voltage plate in the internal accommodation cavity 41 of the circuit breaker, which not only provides mechanical protection for the high-voltage plate and its connected components, but also enhances the electrical insulation performance, prevents external environmental factors from affecting the internal circuit, and ensures the stable operation and long-term reliability of the circuit breaker in complex environments.

[0115] (7) The parallel design of bipolar poles and the setting of homophase poles ensure that the two poles can operate synchronously, improving the current handling capacity of the circuit breaker and the reliability of circuit protection. Secondly, each pole has an independent operating mechanism and control unit, which not only provides higher redundancy, but also makes the control of the circuit breaker more flexible and accurate. The first operating mechanism and the second operating mechanism are respectively connected with the corresponding operating controllers, and can be opened and closed under the control of the first operating controller and the second operating controller according to the received control information. This design improves the stable operation and long-term reliability of the circuit breaker in complex environments. Overall, this design of bipolar pole circuit breaker optimizes the performance of the circuit breaker, improves the safety and maintenance convenience of the system, and enables the circuit breaker to provide efficient and stable protection in various working conditions.

[0116] (8) Multiple 35KV support insulators are used in the series compensation circuit to connect the bipolar pole circuit breaker, series compensation capacitor, damping branch and voltage limiter. These designs aim to improve the electrical performance, safety and reliability of the circuit. Through such configuration, the circuit can operate stably in high-voltage environment, while providing multiple protection mechanisms to ensure safe operation of the circuit under normal and abnormal conditions.

[0117] (9) Since the distance between each pole of the three-phase three-pole breaker in the traditional 10KV series compensation circuit is short, it is easy to cause inter-phase short circuit, thus, it cannot meet the insulation requirement in the 35KV scene, therefore, the three-phase three-pole breaker in the traditional 10KV series compensation circuit is updated to a two-pole breaker, without changing other components (series compensation capacitor and damping branch) in the traditional 10KV series compensation circuit, since the two-pole breaker includes a first pole and a second pole, the first pole and the second pole in the two-pole breaker are in parallel, by replacing the three-phase three-pole breaker with the two-pole breaker, the insulation requirement can be improved without changing the distance between poles, thus, the series compensation circuit provided in the embodiment of the application can adapt to the scenes of 10KV and 35KV at the same time without changing the overall volume of the circuit on the basis of the traditional 10KV series compensation circuit, thus, the scene universality of the series compensation circuit is effectively improved. At the same time, since the components of the traditional 35KV series compensation circuit are usually larger and thicker than those of the traditional 10KV series compensation circuit, the series compensation circuit provided in the embodiment of the application can have an overall volume comparable to that of the traditional 10KV series compensation circuit, thus, the manufacturing cost is significantly lower than that of the traditional 35KV series compensation circuit, while it can adapt to the insulation requirement in the 35KV scene, thus, the manufacturing cost of the series compensation circuit is effectively reduced. Therefore, the series compensation circuit provided in the embodiment of the application can effectively improve the scene universality of the series compensation circuit while reducing the manufacturing cost of the series compensation circuit.

[0118] (10) The configuration of three-phase full compensation helps maintain the balance of three-phase current, reduces energy loss and equipment damage caused by imbalance. Secondly, the series compensation circuit can provide or absorb reactive power, effectively improve the power factor of the system, reduce the loss of the transmission line, and save energy cost. In addition, the series compensation circuit can also regulate and stabilize the voltage, reduce voltage fluctuation, improve power supply quality, and protect downstream loads. By compensating reactive power, the stability of the power system can also be improved, reducing the risk of system failure. Finally, this configuration provides flexibility, allowing adjustments according to the specific needs of each phase to optimize the performance of the overall system. In summary, the configuration of the series compensation circuit realizes the dual improvement of power transmission efficiency and system performance in the 35KV transmission line.

[0119] The above is only an embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent replacements and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A series compensation circuit, characterized by, The series compensation circuit comprises: The double-pole column breaker comprises a first pole column and a second pole column, and the first pole column and the second pole column in the double-pole column breaker are in parallel, wherein the first pole column and the second pole column are in-phase pole columns; A series compensation capacitor is in parallel with the first pole column and the second pole column; A damping branch is in series with the first pole column and in parallel with the second pole column, and the first pole column is used as a fast switch in the series compensation circuit, and the second pole column is used as a bypass switch in the series compensation circuit.

2. The series compensation circuit of claim 1, wherein, The series compensation circuit comprises: A voltage limiter is in parallel with the series compensation capacitor, the second pole column and the first pole column; A current sensor is in series with the voltage limiter, in parallel with the first pole column and the second pole column; A voltage sensor is in parallel with the current sensor, in parallel with each of the first pole column and the second pole column.

3. The series compensation circuit of claim 1, wherein, The double-pole column breaker comprises an operation controller and a high-voltage board, and the series compensation circuit comprises: A general controller and a signal collection board, wherein the general controller is connected with the signal collection board; The signal collection board is in communication connection with the high-voltage board, and the high-voltage board is connected with the operation controller in the double-pole column breaker; The operation controller is used to acquire state information of the first pole column and the second pole column; The high-voltage board is used to acquire the state information sent by the operation controller and send the state information to the signal collection board, and the signal collection board sends the state information to the general controller; The general controller is used to generate control information based on the state information and send the control information to the high-voltage board through the signal collection board; The high-voltage board is also used to send the control information to the operation controller, and the operation controller is used to control the first pole column and / or the second pole column based on the control information.

4. The series compensation circuit of claim 3, wherein, The first pole column comprises a first operation mechanism, and the second pole column comprises a second operation mechanism; and the operation controller comprises a first operation controller and a second operation controller; The first operation mechanism is connected with the first operation controller, and the second operation mechanism is connected with the second operation controller; The first operation mechanism is used to operate the first pole column to open / close under the control of the first operation controller according to the control information; The second operation mechanism is used to operate the second pole column to open / close under the control of the second operation controller according to the control information.

5. The series compensation circuit of claim 3, wherein, The double-pole column breaker comprises a containing box, and the first pole column and the second pole column are arranged on the same side of the containing box and extend along a first direction.

6. The series compensation circuit of claim 5, wherein, The accommodating box comprises an accommodating inner cavity, the first pole column comprises a first pole column body and a first pole column accommodating cavity, and the second pole column comprises a second pole column body and a second pole column accommodating cavity; The first pole column body and the second pole column body are arranged on the same side of the accommodating box, and the first pole column body and the second pole column body extend along a first direction; The first pole column accommodating cavity and the second pole column accommodating cavity are respectively through the accommodating inner cavity.

7. The series compensation circuit of claim 6, wherein, The double-pole circuit breaker comprises a high-voltage plate shell, and the high-voltage plate shell is accommodated in the accommodating inner cavity. The high-voltage plate shell is used for accommodating the high-voltage plate.

8. The series compensation circuit of claim 2, wherein, The series compensation circuit comprises a double isolation switch, the series compensation capacitor is connected in parallel with the second pole column through the double isolation switch, and the first pole column and the second pole column are used for redundantly protecting the series compensation capacitor and the voltage limiter.

9. The series compensation circuit of claim 1, wherein, The series compensation circuit comprises a plurality of support insulators, each of the support insulators is connected with the double-pole circuit breaker, the series compensation capacitor and the damping branch, and each of the support insulators is a 35KV support insulator.

10. A 35 kV power transmission line, characterised in that, Three groups of the series compensation circuit according to any one of claims 1-9 are connected with an A-phase circuit of the power transmission line, a B-phase circuit of the power transmission line and a C-phase circuit of the power transmission line respectively.

Images