Compensation capacitor protection device of low-voltage three-phase circuit

Abstract

The utility model discloses a compensation capacitor protection device of a low-voltage three-phase circuit, which comprises a cabinet body, a capacitor compensation controller is arranged on the inner side of the cabinet body, the capacitor compensation controller comprises a capacitor, and the capacitor compensation controller is connected into the three-phase circuit through a wire; the three-phase circuit is connected with the capacitance compensation controller through a switch; the three-phase circuit is connected with a current transformer; the current transformer is in electric signal connection with the capacitance compensation controller; the three-phase circuit is connected with a protection device, and the protection device is provided with corresponding processing equipment for processing abnormal conditions; the protection device is in electric signal connection with the current transformer. A current transformer is arranged on the circuit to detect the current; a protection device is arranged to cut off the circuit when the current is too large; the capacitance compensation controller is used for compensating errors between input and output of the system and adjusting behaviors of the system so as to meet preset requirements or reference input, and therefore the situation that equipment is damaged or potential safety hazards occur due to the fact that the current of the three-phase circuit is too large is avoided.

Description

Technical Field

[0001] The utility model relates to the field of three-phase circuits, in particular to a compensation capacitor protection device for a low-voltage three-phase circuit. Background Art

[0002] The three-phase circuit consists of a three-phase power supply, a three-phase load, and a three-phase transmission line. Its usage scenarios cover almost all areas that require stable and efficient power supply, such as industrial production, power systems, commercial and residential areas, transportation areas, and agricultural areas. The compensation controller is mainly used to compensate for the error between the input and output of the system and adjust the behavior of the system to meet the predetermined requirements or reference input. In a three-phase circuit, the compensation controller can reduce the error by adjusting the input signal of the system to make the output of the system closer to the desired reference signal.

[0003] At present, the three-phase circuit compensation capacitor protection has the problem of difficult circuit heat dissipation, excessive current causing equipment damage or safety accidents, and there is an error between the input and output of the power system, which is easy to cause energy loss and pollute the environment. In addition, the three-phase circuit compensation capacitor protection has the problem of three-phase imbalance: in public buildings and other applications, there are a large number of single-phase electrical loads. Since the power factor of these loads themselves is low and their operation is random, the three-phase balance that should be maintained according to the load of the power supply and distribution system control circuit is difficult to achieve in actual operation. This imbalance is not only irregular, but also difficult to predict and reasonably improve in advance. When using a low-voltage three-phase low-voltage capacitor group for centralized reactive power compensation, since the power factor of each phase load is different, the three-phase power factor after compensation may still be inconsistent, which may cause under-compensation or over-compensation of a phase. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings and provides a compensation capacitor protection device for a low-voltage three-phase circuit, which is expected to solve the situation where excessive current in the three-phase circuit causes equipment damage or safety accidents.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A compensation capacitor protection device for a low-voltage three-phase circuit includes a cabinet and a three-phase circuit. A capacitor compensation controller is provided inside the cabinet. The capacitor compensation controller includes a capacitor. The capacitor compensation controller is arranged in a triangle. The capacitor compensation controller is connected to the three-phase circuit through a wire. The three-phase circuit is connected to the capacitor compensation controller through a switch. The current signal of the three-phase circuit is from left to right. When the switch is in an on state, the current flows into the cabinet through the three-phase circuit. When the switch is in a closed state, the current flows along the three-phase circuit. The three-phase circuit is connected to a current transformer, which is used to measure the current flowing through the three-phase circuit. The current transformer is electrically connected to the capacitor compensation controller. The three-phase circuit is connected to a protection device, which is used to protect the three-phase circuit. The protection device is provided with a corresponding processing device for handling abnormal situations. The protection device is electrically connected to the current transformer.

[0007] Furthermore, a heat dissipation hole is provided on the outside of the cabinet, and the heat dissipation hole is used to allow air to circulate between the cabinet and the outside.

[0008] Furthermore, the processing device of the protection device includes a circuit breaker, which is connected to the three-phase circuit through a wire, and the circuit breaker is used to cut off the circuit when receiving the electrical signal of the current transformer.

[0009] Furthermore, the switch is arranged outside the cabinet, and the switch is used to control the connection circuit between the three-phase circuit and the capacitor compensation controller.

[0010] Furthermore, the switch is electrically connected to the capacitor compensation controller and the current transformer, and the current transformer transmits a current magnitude signal to the switch.

[0011] Furthermore, a temperature sensor is provided inside the cabinet, the temperature sensor is connected to the switch electrical signal, the temperature sensor is connected to the inside of the cabinet by bolts, and the temperature sensor is used to monitor the temperature of the capacitor compensation controller in real time.

[0012] Furthermore, a filter is provided inside the cabinet, and the filter is connected to the inside of the cabinet by bolts, and the filter is used to filter out harmonics generated by the capacitor.

[0013] Furthermore, a voltage monitor is provided inside the cabinet, the voltage monitor is connected to the cabinet, and the voltage monitor is used to monitor the circuit voltage.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model detects the current of the three-phase circuit by arranging a current transformer on the three-phase circuit; arranging a protection device to cut off the circuit when the current is too large; arranging a capacitor compensation controller to compensate for the error between the input and output of the system, and adjusting the behavior of the system to meet the predetermined requirements or reference input, thereby avoiding the situation where the three-phase circuit is damaged or a safety hazard occurs due to excessive current. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the cabinet structure of the utility model.

[0018] Label description: 1. Cabinet; 2. Three-phase circuit; 3. Heat dissipation hole; 4. Capacitor compensation controller; 5. Protection device; 6. Current transformer; 7. Switch; 8. Filter; 9. Temperature sensor. DETAILED DESCRIPTION

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] Example 1.

[0021] like Figure 1 As shown, one embodiment of the utility model is a compensation capacitor protection device for a low-voltage three-phase circuit, which is used to perform capacitance compensation on the low-voltage three-phase circuit and protect the circuit from potential faults; the device includes a cabinet 1, and a capacitor compensation controller 4 is provided inside the cabinet 1. The capacitor compensation controller 4 includes a capacitor, and the capacitor compensation controller 4 includes a plurality of capacitors. The capacitor compensation controller 4 is arranged in a triangle to optimize the capacitor compensation effect. The capacitor compensation controller 4 is connected to the three-phase circuit 2 through a wire, thereby realizing compensation for the three-phase circuit;

[0022] A three-phase circuit 2, wherein the three-phase circuit 2 is connected to the capacitor compensation controller 4 via a switch 7;

[0023] Among them, the current signal of the three-phase circuit 2 is from left to right. When the switch 7 is in the on state, the current flows into the cabinet through the three-phase circuit 2; when the switch 7 is in the off state, the current flows along the three-phase circuit 2.

[0024] The three-phase circuit 2 is connected to a current transformer 6, and the current transformer 6 is used to measure the magnitude of the current flowing through the three-phase circuit 2;

[0025] The current transformer 6 is electrically connected to the capacitor compensation controller 4, and the output signal of the current transformer 6 is electrically connected to the capacitor compensation controller 4, so that the capacitor compensation controller 4 can automatically adjust the switching of the compensation capacitor according to the current size;

[0026] The three-phase circuit 2 is connected to a protection device 5, which is used to protect the three-phase circuit 2. The protection device 5 is provided with corresponding processing equipment for processing abnormal situations; when the current transformer 6 detects abnormal current, the protection device 5 can quickly cut off the circuit or take other necessary protection measures to prevent the fault from expanding;

[0027] The protection device 5 is electrically connected to the current transformer 6 to ensure that the protection device 5 can receive and process the current signal from the current transformer 6 in real time, thereby achieving effective monitoring and protection of the three-phase circuit 2.

[0028] When the switch 7 is in the on state, the current signal of the three-phase circuit 2 flows in from the left side, and smoothly enters the cabinet 1 after the switch 7 is turned on. At this time, the current passes through the capacitor compensation controller 4, and the capacitor is automatically switched according to the actual needs of the circuit to optimize the circuit performance.

[0029] When the switch 7 is in the closed state, the current continues to flow in the three-phase circuit 2, but does not enter the cabinet 1. This is because the disconnection of the switch 7 cuts off the path for the current to enter the cabinet 1, ensuring that when capacitor compensation or maintenance is not required, the current can flow safely along the original path without causing interference or damage to the electrical components inside the cabinet.

[0030] Thus, the direction of the current can be flexibly controlled as required, which not only realizes efficient compensation of the circuit, but also ensures safe and stable operation of the circuit when compensation is not required. The switch 7 is easy to open and close, which improves the usability and flexibility of the device.

[0031] In addition, the design also enhances the safety of the device. When the switch 7 is closed, even if there is a fault or maintenance operation inside the cabinet 1, it will not affect the normal operation of the three-phase circuit 2, reducing the risk of circuit interruption due to misoperation or fault.

[0032] This embodiment monitors the current in the circuit in real time by setting the current transformer 6. At the same time, the device also has a high level of intelligence and can automatically adjust the switching of the compensation capacitor according to the actual situation of the three-phase circuit to achieve the best compensation effect. In addition, the device also has a fault self-diagnosis function, which can timely discover and deal with potential problems to ensure the safe and stable operation of the three-phase circuit.

[0033] Example 2.

[0034] like Figure 2 As shown, another embodiment of the utility model is that a heat dissipation hole 3 is provided on the outer side of the cabinet 1, and the heat dissipation hole 3 is used to allow air to circulate between the cabinet 1 and the outside.

[0035] The cabinet 1 is the outer shell of the entire device and is made of a solid metal material with good protective performance. The cabinet 1 is not only used to accommodate and protect the internal electrical components, but also bears the structural stability of the entire device. In order to facilitate the heat dissipation inside the cabinet 1, heat dissipation holes 3 are set on the outside of the cabinet 1. These heat dissipation holes 3 are evenly distributed, so that the air inside the cabinet 1 can circulate with the outside, effectively reducing the temperature inside the cabinet 1 and ensuring the normal operation and long-term stability of the internal electrical components.

[0036] Example 3.

[0037] Another embodiment of the present invention is that the processing device of the protection device 5 includes a circuit breaker, and the circuit breaker is used to cut off the circuit when receiving the electrical signal of the current transformer 6.

[0038] When the current transformer 6 detects an abnormal current flowing through the circuit during continuous monitoring of the three-phase circuit 2, that is, the current value suddenly increases and exceeds the preset safety threshold, it will respond quickly. Once the current abnormality is confirmed, the current transformer 6 will immediately start the internal signal transmission mechanism to generate an emergency electrical signal. When the protection device 5 receives the electrical signal from the current transformer 6, the processor inside the protection device 5 will quickly analyze and judge the signal.

[0039] Once it is confirmed that it is a current abnormality signal, the protection device 5 will immediately start the circuit breaker. After receiving the command, the circuit breaker will quickly cut off the connection with the three-phase circuit 2.

[0040] At the same time, the protection device 5 will also record the relevant information of the fault, including the time of the fault, the value of the abnormal current, etc., to provide an important basis for subsequent fault analysis and processing. Through such a design, the protection device 5 can not only respond quickly in an emergency, but also provide detailed fault records, providing comprehensive protection for the stable operation of the power system.

[0041] Example 4.

[0042] Another embodiment of the utility model is that the switch 7 is arranged outside the cabinet 1 , and the switch 7 is used to control the connection circuit between the three-phase circuit 2 and the capacitor compensation controller 4 .

[0043] The connection between the three-phase circuit 2 and the capacitor compensation controller 4 is controlled by a switch 7. The switch 7 is arranged outside the cabinet 1, and the staff can conveniently control the connection circuit between the three-phase circuit 2 and the capacitor compensation controller 4 by operating the switch 7 to realize the switching and disconnection of the circuit.

[0044] The current entering the circuit of the cabinet 1 is controlled by the switch 7. When the current meets the set conditions, the switch 7 is turned on. When the current does not meet the set conditions, the switch 7 is turned off, thereby realizing the control of the circuit.

[0045] Example 5.

[0046] Another embodiment of the present utility model is that the switch 7 is electrically connected to the capacitor compensation controller 4 and the current transformer 6 , and the current transformer 6 transmits a current magnitude signal to the switch 7 .

[0047] The switch 7 is arranged outside the cabinet 1, and an electrical signal connection is established between the switch 7 and the capacitor compensation controller 4 and the current transformer 6. This connection enables the switch 7 to receive electrical signals from these two components in real time and perform corresponding operations according to these signals.

[0048] As the core component of the device, the capacitor compensation controller 4 is responsible for automatically switching the capacitor according to the actual needs of the circuit. It realizes the capacitor compensation of the circuit and optimizes the circuit performance by connecting with the three-phase circuit 2.

[0049] The current transformer 6 is installed on the three-phase circuit 2 and is used to measure the current in the circuit in real time. The current transformer 6 transmits the measured current magnitude signal to the capacitor compensation controller 4 for automatic adjustment of the capacitor, and transmits these signals to the switch 7 at the same time. Through the electrical signal connection between the current transformer 6 and the switch 7, the switch 7 can control the current flow direction in real time.

[0050] In actual operation, when the current transformer 6 detects that the current in the three-phase circuit 2 exceeds the preset safety threshold, it will immediately transmit this information in the form of an electrical signal to the switch 7. After receiving this signal, the switch 7 will respond quickly and cut off the connection circuit between the three-phase circuit 2 and the capacitor compensation controller 4, thereby effectively isolating the faulty part and preventing the fault from further expanding.

[0051] This design allows the device to sense current changes in the circuit in real time and take quick action when an abnormal situation occurs, protecting the circuit from potential failures.

[0052] In summary, through the electrical signal connection between switch 7 and the capacitor compensation controller 4 and the current transformer 6, and the design of the current transformer 6 transmitting the current magnitude signal to the switch 7, the compensation capacitor protection device of the low-voltage three-phase circuit realizes efficient compensation and precise protection of the circuit, providing strong support for the stable operation of the power system.

[0053] Example 6.

[0054] Another embodiment of the utility model is a compensation capacitor protection device for a low-voltage three-phase circuit, which aims to provide more accurate and comprehensive circuit protection by real-time monitoring of the working temperature of the capacitor compensation controller. A temperature sensor 9 is provided inside the cabinet 1, and the temperature sensor 9 is electrically connected to the switch 7, and the temperature sensor 9 is used to monitor the temperature of the capacitor compensation controller 4 in real time.

[0055] The temperature of the capacitor is monitored in real time by the temperature sensor 9. When the temperature is too high, the protection device is triggered to cut off the circuit to prevent the capacitor from being damaged by overheating.

[0056] Specifically, the temperature sensor 9 is used to monitor the temperature of the capacitor compensation controller 4. Once the temperature exceeds the preset safety range, it will immediately transmit the temperature signal in the form of an electrical signal to the switch 7. After receiving the signal, the switch 7 will quickly start the corresponding protection mechanism and turn off the switch 7. At the same time, the protection device 5 will also receive the specific situation of the temperature abnormality. The protection device 5 can choose to cut off the circuit, start the cooling system or issue an alarm according to the specific situation.

[0057] This design enables the device to understand the working status of the capacitor compensation controller 4 in real time, and take prompt measures when temperature anomalies occur to prevent circuit failure or equipment damage caused by overheating. At the same time, since an electrical signal connection is established between the temperature sensor 9 and the switch 7, the entire protection process is automated and intelligent, improving the accuracy and efficiency of the protection.

[0058] In summary, the low-voltage three-phase circuit compensation capacitor protection device in this embodiment realizes real-time monitoring and precise protection of the temperature of the capacitor compensation controller 4 by introducing the temperature sensor 9 and establishing an electrical signal connection therewith, thereby improving the safety and reliability of the circuit.

[0059] Example 7.

[0060] Another embodiment of the present invention is that a filter 8 is provided inside the cabinet 1 , and the filter 8 is used to filter out harmonics generated by the capacitor.

[0061] The filter 8 can effectively filter out the harmonics generated by the capacitor during the switching process. Harmonics are a common interference in the power system, which may cause electrical equipment to overheat, reduce efficiency or even be damaged. Therefore, by installing the filter 8, the adverse effects of harmonics on circuits and equipment can be significantly reduced.

[0062] In actual operation, when the capacitor compensation controller 4 switches the capacitor according to the circuit requirements, the filter 8 will work in real time to filter out the harmonics generated by the capacitor, so as to ensure the stable operation of the circuit and extend the service life of the electrical equipment.

[0063] In addition, the setting of the filter 8 also improves the environmental performance of the entire device. By reducing the generation and propagation of harmonics, the electromagnetic pollution to the surrounding environment is reduced.

[0064] Since harmonics are one of the main factors that cause damage and performance degradation of electrical equipment, by installing a filter 8, the impact of harmonics on the equipment can be reduced and its service life can be extended.

[0065] In summary, the low-voltage three-phase circuit compensation capacitor protection device in this embodiment effectively filters out the harmonics generated by the capacitor by introducing the filter 8, thereby improving the circuit stability, equipment life and power quality, and enhancing the environmental protection performance of the device.

[0066] Example 8.

[0067] Another embodiment of the present invention is that a voltage monitor is provided inside the cabinet 1 , and the voltage monitor is connected to the cabinet 1 , and the voltage monitor is used to monitor the circuit voltage.

[0068] In actual operation, the voltage monitor will continuously monitor the circuit voltage. Once the voltage is detected to be beyond the preset safety range, whether it is too high or too low, the voltage monitor will respond immediately. It will transmit the abnormal voltage information to the protection device 5 or other control unit through the electrical signal connection, triggering the corresponding protection mechanism.

[0069] These protection mechanisms may include cutting off the circuit, sounding an alarm, or automatically adjusting the working state of the capacitor compensation controller 4, depending on the nature and severity of the voltage anomaly. Through these measures, the device can respond quickly to voltage anomalies to prevent circuit damage or equipment failure.

[0070] In addition, the use of voltage monitors also provides staff with real-time data on circuit voltage. Based on this data, staff can understand the operating status of the circuit and conduct troubleshooting or optimization adjustments. This helps improve the operating efficiency of the circuit and extend the service life of the equipment.

[0071] Example 9.

[0072] On the basis of the above-mentioned embodiments, the present invention can also adopt the following configuration mode: in order to make the internal layout of the cabinet 1 more reasonable and improve the maintenance convenience of the device, the cabinet 1 adopts a modular design.

[0073] Specifically, the cabinet 1 is divided into multiple functional modules, each of which has a specific function. For example, some modules are specifically used to install the capacitor compensation controller 4 and the current transformer 6, while some modules are used to install the filter 8 and the protection device 5. This design not only makes the layout of each component clearer, but also facilitates the maintenance and replacement of specific components by the staff.

[0074] In addition, the modular design also improves the scalability of the device. When the staff needs to increase or decrease certain functions, they only need to add or remove the corresponding modules without making large-scale changes to the entire device.

[0075] In summary, by adopting a modular design, the low-voltage three-phase circuit compensation capacitor protection device in this embodiment improves the maintenance convenience and scalability while also ensuring the performance and reliability of the device.

[0076] Example 10.

[0077] On the basis of the above-mentioned embodiments, the present invention can also adopt the following configuration mode to realize automatic and intelligent management of the device.

[0078] The intelligent control system establishes electrical signal connections with components such as the protection device 5, the capacitor compensation controller 4, and the current transformer 6 to obtain real-time information on the operating status of the circuit and equipment. Based on this information, the intelligent control system can automatically determine whether the circuit requires capacitor compensation, as well as the level and duration of compensation. At the same time, it can also monitor key parameters such as the current size and temperature changes in the circuit in real time, and once an abnormal situation is found, the corresponding protection mechanism will be immediately activated.

[0079] In addition, the intelligent control system also has the function of remote monitoring and management. The staff can remotely access the control system through mobile phones, computers and other terminal devices, view the operating status of circuits and equipment in real time, and perform parameter settings and troubleshooting. This not only improves the convenience of management, but also reduces the cost and risk of on-site maintenance.

[0080] In summary, by introducing the intelligent control system, the low-voltage three-phase circuit compensation capacitor protection device in this embodiment realizes the automatic and intelligent management of the circuit, improves the performance and reliability of the device, and also reduces the maintenance cost.

[0081] The "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the utility model.

[0082] Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the disclosure, drawings, and claims of the present application, various modifications and improvements may be made to the components and / or layout of the subject combination layout. In addition to modifications and improvements to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A compensating capacitor protection device for a low-voltage three-phase circuit, comprising a cabinet (1), characterized in that: A capacitance compensation controller (4) is provided inside the cabinet (1), the capacitance compensation controller (4) comprises capacitors, the capacitance compensation controller (4) is arranged in a triangle, and the capacitance compensation controller (4) is connected to the three-phase circuit (2) via a wire; A three-phase circuit (2), wherein the three-phase circuit (2) is connected to the capacitance compensation controller (4) via a switch (7); The current signal of the three-phase circuit (2) is from left to right. When the switch (7) is in an on state, the current flows into the cabinet (1) through the three-phase circuit (2); when the switch (7) is in a off state, the current flows along the three-phase circuit (2); The three-phase circuit (2) is connected to a current transformer (6), and the current transformer (6) is used to measure the magnitude of the current flowing through the three-phase circuit (2); The current transformer (6) is electrically signal connected to the capacitance compensation controller (4); The three-phase circuit (2) is connected to a protection device (5), and the protection device (5) is used to protect the three-phase circuit (2); The protection device (5) is electrically signal connected to the current transformer (6).

2. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: The cabinet body (1) is provided with heat dissipation holes (3) on the outside, and the heat dissipation holes (3) are used to allow air to circulate between the cabinet body (1) and the outside.

3. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: The protection device (5) comprises a circuit breaker, which is connected to the three-phase circuit (2) via a wire, and is used to cut off the circuit when receiving an electrical signal from the current transformer (6).

4. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: The switch (7) is arranged outside the cabinet (1), and the switch (7) is used to control the connection circuit between the three-phase circuit (2) and the capacitance compensation controller (4).

5. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: The switch (7) is electrically connected to the capacitance compensation controller (4) and the current transformer (6), and the current transformer (6) transmits a current magnitude signal to the switch (7).

6. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: A temperature sensor (9) is provided on the inner side of the cabinet (1), the temperature sensor (9) is electrically connected to the switch (7), the temperature sensor (9) is connected to the inner side of the cabinet (1) via bolts, and the temperature sensor (9) is used to monitor the temperature of the capacitor compensation controller (4) in real time.

7. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: A filter (8) is provided on the inner side of the cabinet (1); the filter (8) is connected to the inner side of the cabinet (1) via bolts; the filter (8) is used to filter out harmonics generated by the capacitor.

8. The compensation capacitor protection device for a low voltage three-phase circuit according to claim 1, characterized in that: A voltage monitor is provided inside the cabinet (1), the voltage monitor is connected to the cabinet (1), and the voltage monitor is used to monitor the circuit voltage.

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