Temperature control type molded case circuit breaker

Abstract

The invention provides a temperature control type molded case circuit breaker, which relates to the technical field of low-voltage electric appliances, and comprises a short circuit magnetic tripping module and an overload temperature control tripping module, the overload temperature control release comprises a power supply unit, a magnetic flux release and a temperature control unit. The short circuit magnetic tripping module is electrically connected with the power supply unit, the power supply unit is electrically connected with the temperature control unit, and the temperature control unit is electrically connected with the temperature control unit. According to the invention, dynamic adjustment protection is realized based on temperature parameters, and a powerful guarantee is provided for safe and stable operation of a power system.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly to a temperature-controlled molded case circuit breaker. Background Art

[0002] In modern power systems, whether in industrial plants, commercial buildings, or the power distribution links of residential houses, low-voltage electrical appliances and distribution electrical appliances play a crucial role in ensuring the stable distribution and safe use of electricity. As one of the core devices among them, the performance of the molded case circuit breaker directly affects the reliability and stability of the entire power distribution system. Traditional molded case circuit breakers mainly rely on thermal-magnetic or electronic technologies, but both of these two types of technologies have obvious drawbacks that cannot be ignored. Thermal-magnetic circuit breakers are limited by the physical properties of the bimetallic strip, with complex debugging, poor accuracy, and high energy consumption; although electronic circuit breakers have improved in accuracy, their dependence on current transformers leads to reduced reliability, high costs, and a bulky structure.

[0003] Therefore, a temperature-controlled molded case circuit breaker is proposed. Summary of the Invention

[0004] This specification provides a temperature-controlled molded case circuit breaker, which realizes dynamic adjustment and protection based on temperature parameters, providing strong guarantee for the safe and stable operation of the power system.

[0005] This specification provides a temperature-controlled molded case circuit breaker, including: a short-circuit magnetic tripping module and an overload temperature-controlled tripping module; The overload temperature-controlled tripping includes a power supply unit, a magnetic flux tripping device, and a temperature control unit; the short-circuit magnetic tripping module is electrically connected to the power supply unit, the power supply unit is electrically connected to the temperature control unit, and the temperature control unit is electrically connected to the temperature control unit.

[0006] Optionally, the method of fault identification includes: performing overload fault identification on the temperature-controlled molded case circuit breaker based on the measured temperature parameter, or performing overload fault identification on the temperature-controlled molded case circuit breaker based on the change rate of the measured temperature parameter.

[0007] Optionally, the temperature control unit includes a temperature control switch; The short-circuit magnetic tripping module is respectively electrically connected to the power supply unit and the temperature switch, the power supply unit is electrically connected to the temperature control switch, and the temperature control switch is electrically connected to the magnetic flux tripping device.

[0008] Optionally, the temperature control switch includes a bimetal type temperature control switch.

[0009] Optionally, it further includes: a signal amplification and processing circuit, a delay control circuit; The temperature control switch is electrically connected to the signal amplification and processing circuit, the signal amplification and processing circuit is electrically connected to the delay control circuit, and the delay control circuit is electrically connected to the magnetic flux release.

[0010] Optionally, the overload temperature control and release module includes a temperature sensing and detection unit, a magnetic flux release, and an embedded control unit formed based on measured temperature parameters; The short-circuit magnetic release module is electrically connected to the power supply unit, the temperature sensing and detection unit, and the magnetic flux release respectively. The power supply unit is electrically connected to the control unit and the temperature sensing and detection unit respectively. The temperature sensing and detection unit is electrically connected to the control unit, and the control unit is electrically connected to the magnetic flux release.

[0011] Optionally, the control unit includes an STM32F407 embedded microcontroller.

[0012] Optionally, the temperature sensing and detection unit includes a DS18B20 digital temperature sensor.

[0013] Optionally, it further includes a communication interface module electrically connected to the overload temperature control and release module; the communication interface module includes an RS485 interface, an Ethernet interface, a USB interface, a LORA interface, and a ZIGBEE interface.

[0014] In the present invention, by accurately sensing the main circuit conductive system of the circuit breaker and the ambient temperature, key temperature parameters are obtained, and advanced algorithms are used to deeply analyze and process these parameters, thereby realizing the dynamic adjustment of protection characteristics. This innovative technology not only breaks through the bottleneck of traditional technologies but also opens up a new direction for the development of molded case circuit breakers. It can adapt to more complex and changeable power operation environments, meet the stringent requirements for distribution equipment in emerging fields such as industrial automation production and new energy access, and significantly enhance the safety and reliability of the system while improving the operation efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of a temperature control type molded case circuit breaker based on a temperature control switch provided by an embodiment of this specification; Figure 2 It is a schematic structural diagram of another embedded temperature control type molded case circuit breaker provided by an embodiment of this specification.

[0017] Accompanying drawings illustration: 100, short - circuit magnetic trip; 200, overload temperature - controlled magnetic trip; 21, power supply unit; 22, temperature - controlled switch; 23, magnetic flux trip; 24, control unit; 25, temperature sensing and detection unit; 26, communication interface module. Detailed implementation manners

[0019] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0020] The following combines the accompanying Figure 1-2 The exemplary embodiments of the present invention are described more comprehensively. However, the exemplary embodiments can be implemented in various forms and should not be understood that the present invention is limited to the embodiments described herein. On the contrary, providing these exemplary embodiments can make the present invention more comprehensive and complete, and more convenient to fully convey the inventive concept to those skilled in the art. The same reference numerals in the figures represent the same or similar elements, components, or parts, so the repeated description of them will be omitted.

[0021] On the premise of conforming to the technical concept of the present invention, the features, structures, characteristics, or other details described in a specific embodiment do not exclude being combined in a suitable manner in one or more other embodiments.

[0022] In the description of specific embodiments, the features, structures, characteristics, or other details described in the present invention are for those skilled in the art to fully understand the embodiments. However, it does not exclude that those skilled in the art can practice the technical solutions of the present invention without one or more of the specific features, structures, characteristics, or other details.

[0023] The flowcharts shown in the accompanying drawings are only exemplary illustrations, and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0024] The block diagrams shown in the accompanying drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0025] The term "and / or" or "and / or" includes all combinations of any one or more of the associated listed items.

[0026] In the manufacturing process, traditional thermal-magnetic molded case circuit breakers face an extremely cumbersome debugging process. Under the same frame specification, to adapt to different rated currents, the bimetallic action current must be finely debugged through the thermal adjustment screw. This process requires technicians to rely on rich experience and professional tools to operate each product one by one. Taking the common 250A rated current specification switching as an example, when adjusting from 250A to 200A, due to the difference in the physical properties of the bimetallic strip, it is necessary to fine-tune the thermal adjustment screw multiple times, which takes an average of about 6 minutes; if switched to 125A, the corresponding relationship between the deformation of the bimetallic strip and the current is more complicated, and the debugging time often exceeds 12 minutes. For large-scale production companies, the debugging of batch products not only consumes a lot of manpower and time costs, but also easily increases the discreteness of product performance due to differences in human operations, affecting the stability of product quality.

[0027] As the core action element of the traditional thermal-magnetic molded case circuit breaker, the action current of the bimetallic strip is interfered by many factors, resulting in extremely unstable protection characteristics. The change of ambient temperature has a significant impact on the bimetallic strip. When the ambient temperature fluctuates between -5℃ and 40℃, the measured deviation of the bimetallic strip action current can reach ±8%. In outdoor power distribution facilities, during the high temperature period in summer, the ambient temperature often exceeds 40℃, and the circuit breaker is frequently triggered by mistake; during the low temperature in winter, action delays or even refusal to operate often occur. In addition, with the increase of service life, the aging of the bimetallic strip increases, and the internal metal structure changes, resulting in action current drift. After long-term tracking tests, the average deviation of the bimetallic strip action current of the circuit breaker after 5 years of use has increased to ±12%, which seriously threatens the safe and reliable operation of the distribution system.

[0028] The thermal bimetal module is connected to the main conductive circuit through multiple welding points. This structural design brings about an unavoidable internal resistance problem. Differences in metal materials at the welding points and uneven welding process quality will increase the contact resistance. The accumulation of multiple welding points leads to a significant increase in the overall internal resistance. Under long-term full-load operation conditions, such as industrial production equipment running continuously for more than 8 hours, the thermal effect of the main conductive circuit current causes the temperature of the welding point to rise sharply, and the measured temperature rise can reach 10K - 15K. Excessive temperature rise not only accelerates the aging of surrounding insulation materials and reduces insulation performance, but may also cause fire hazards, seriously affecting the stability and service life of the distribution system.

[0029] The continuous heating of the thermal tripping system is a major pain point in energy consumption for traditional thermal-magnetic molded case circuit breakers. Taking a traditional 250A circuit breaker as an example, in the normal working state, the power consumption of the thermal tripping system is stable at about 12W. This is because the bimetallic strip continuously maintains deformation under the current thermal effect, consuming electrical energy and converting it into heat energy. In a medium-sized commercial complex, if 1000 such circuit breakers are installed, calculated based on running for 12 hours a day and an electricity price of 0.8 yuan per degree, the annual electricity cost generated only by the power consumption of the circuit breaker thermal tripping system is as high as 43,800 yuan. With the in-depth implementation of the concept of energy conservation and emission reduction and the rise of electricity costs, this high-power consumption characteristic has increasingly become a key factor restricting its wide application.

[0030] The inconsistency of the current transformer will make the feedback signal received by the controller unstable. This unstable feedback signal will cause the controller to continuously adjust the control strategy, triggering system oscillations. In some systems with extremely high stability requirements, such as the relay protection devices in the power system, poor current transformer consistency may even lead to misjudgment by the controller, sending out incorrect action instructions, resulting in serious consequences and greatly reducing the stability and reliability of system operation.

[0031] Due to the limitations of the current transformer's own characteristics and power supply capacity, in the case of a small current in the main circuit, the current transformer cannot provide electrical energy quickly and in full. In actual applications, generally when the single-phase current reaches 0.4*In, the electronic controller can work normally.

[0032] From the perspective of the current transformer's own characteristics, its volume is relatively large. This is mainly because the working principle of the current transformer is based on electromagnetic induction. In order to achieve precise current transformation, it requires a core of a certain specification and windings with a large number of turns. In addition to the large volume, the cost of the current transformer is also relatively high. During the manufacturing process, the requirements for the core material of the current transformer are extremely strict, and high-quality materials such as silicon steel sheets with high magnetic permeability and low loss are usually selected, and these materials are relatively expensive in themselves. To ensure the high precision and stability of the current transformer, the manufacturing process is complex, involving fine wire winding, insulation treatment and other multiple links, and each link requires strict quality control, which undoubtedly further increases the manufacturing cost of the current transformer. When installing such a large-volume and high-cost current transformer inside the circuit breaker, problems follow one after another. The internal space of the circuit breaker is limited and originally needs to accommodate key components such as the arc extinguishing device, operating mechanism, and contact system. These components are all indispensable for the normal operation of the circuit breaker and each requires a certain amount of space. The addition of the current transformer makes the internal space even more tense. The limited space makes the layout between components cramped, not only increasing the difficulty of installation and maintenance, but also possibly intensifying the electromagnetic interference between components due to space squeezing, affecting the normal operation of the equipment.

[0033] In the current development process of intelligent electrical equipment, as a core component, the intelligent controller endows the equipment with many advanced functions and excellent performance. However, the resulting high cost has become a significant obstacle restricting its wider application and the further development of the industry. Analyzing from the hardware level, the intelligent controller integrates a large number of complex and precise electronic components. First of all, there is a high-performance microprocessor. To achieve fast data processing and accurate operation of control algorithms, chips with fast operation speed and strong processing ability are required. Such chips often have high R & D costs and extremely high technical thresholds, so their prices are quite high. For example, the unit price of some microprocessors with multitasking processing capabilities and high-speed data transmission interfaces may be several times or even dozens of times that of ordinary chips. At the same time, to ensure the stable operation of the controller and accurately collect various signals, high-precision analog-to-digital conversion chips (ADC), digital-to-analog conversion chips (DAC), and various sensor interface chips need to be equipped. These chips not only need to meet the strict requirements of the intelligent controller for signal accuracy and stability but also need to have good compatibility and anti-interference capabilities. Their manufacturing processes are complex and the production difficulty is high, resulting in high costs. In addition, to ensure the normal operation of the controller in a complex electromagnetic environment, high-quality multi-layer printed circuit boards (PCB) need to be used. Such circuit boards not only have many layers and high wiring density but also have strict requirements for the electrical performance and heat dissipation performance of the board material, and their manufacturing costs are also much higher than ordinary circuit boards. In terms of software, the operating systems and various control algorithms carried by the intelligent controller are also important components of the cost. The intelligent controller usually needs to run a specially customized real-time operating system (RTOS). Such an operating system can ensure that the controller accurately responds to various events and tasks in scenarios with extremely high real-time requirements. However, developing and maintaining such a real-time operating system requires a large amount of human, material, and time costs, involving multiple professional fields such as operating system kernel development, driver program writing, and task scheduling algorithm optimization. In addition, to achieve the intelligent functions of the intelligent controller, such as equipment status monitoring, fault diagnosis, and remote communication, a series of complex control algorithms and application software need to be developed. The development of these algorithms and software requires a professional software development team. They not only need to have profound electrical control theory knowledge but also be proficient in advanced software development technologies and algorithm design skills, which undoubtedly greatly increases the software development cost.

[0034] Figure 1 The following is a schematic structural diagram of a temperature-controlled molded case circuit breaker based on a temperature control switch provided by an embodiment of this specification, including: A short-circuit magnetic trip module and an overload temperature-controlled trip module; The overload temperature-controlled trip includes a power supply unit, a magnetic flux trip device, and a temperature control unit; the short-circuit magnetic trip module is electrically connected to the power supply unit, the power supply unit is electrically connected to the temperature control unit, and the temperature control unit is electrically connected to the temperature control unit.

[0035] In the specific embodiments of this specification, at key parts of the main circuit conductor of the circuit breaker, highly sensitive temperature sensors are precisely installed, or the temperature of the main circuit conductor is led to a temperature-controlled control unit through wires and then highly sensitive temperature sensors are installed. These sensors select components such as thermistors or thermocouples with high precision and fast response characteristics. Taking the thermistor as an example, its resistance value shows an extremely sensitive and stable linear change relationship with the temperature change of the main circuit conductor. Through a carefully designed signal conditioning circuit, the resistance change of the thermistor is converted into an accurate voltage signal output. At the same time, to ensure good heat conduction between the sensor and the main circuit conductor, special heat-conducting materials and a tightly fitting installation process are adopted, enabling the sensor to quickly and accurately sense the actual temperature value T1 of the main circuit conductor, effectively avoiding temperature measurement errors caused by heat transfer delay or poor contact.

[0036] To obtain an accurate ambient temperature value T2, inside the molded case circuit breaker, an ambient temperature sensor is installed at a position far from the heat source and with good ventilation. This sensor also has high precision and stability and can monitor the temperature change of the surrounding environment in real time. Similar to the main circuit conductor temperature sensor, the temperature signal collected by the ambient temperature sensor also undergoes strict signal conditioning and amplification processing to ensure the accuracy and reliability of the output signal. In addition, considering the influence of environmental factors on temperature measurement, the sensor is specially protected to enable it to resist environmental interferences such as humidity and dust, ensuring stable measurement of the ambient temperature under various complex working conditions.

[0037] The control unit uses a highly reliable microprocessor with a specially designed temperature data processing algorithm built in. When receiving the main circuit conductor temperature value T1 and the ambient temperature value T2, the microprocessor immediately performs a quick and accurate calculation according to the formula T3 = T1 - T2 to obtain the actual temperature rise value T3 of the circuit breaker. This calculation process is completed in a very short time, ensuring real-time monitoring and timely feedback of the operating state of the circuit breaker.

[0038] The control unit deeply analyzes the calculated temperature rise value T3 and, in combination with the rated parameters and actual operating conditions of the circuit breaker, pre-sets a reasonable temperature rise protection threshold. This protection threshold is not fixed but is adjusted through flexible software configuration according to different application scenarios and user requirements of the circuit breaker. For example, in some industrial production environments with strict overload protection requirements, the protection threshold can be set relatively low so that the protection action can be triggered in time when the circuit breaker has a slight overload; while in some occasions with high requirements for power supply continuity, the protection threshold can be appropriately increased to avoid unnecessary tripping actions caused by short-term temperature fluctuations.

[0039] The control unit continuously monitors the temperature rise value T3 in real time. Once T3 exceeds the preset protection threshold, the control unit immediately activates or activates the protection mechanism after a certain delay. Through the internal logic judgment circuit, the overload situation is further confirmed and analyzed to eliminate the possibility of misjudgment caused by instantaneous temperature fluctuations or interference signals.

[0040] After confirming that the overload situation is true, the control unit quickly issues a tripping command. This command is transmitted to the tripping magnetic flux through a high-speed and reliable line, and the tripping magnetic flux immediately acts, causing the contacts of the circuit breaker to quickly separate, cutting off the main circuit current, thereby realizing the long-delay overload protection function. The entire tripping process responds quickly and operates reliably, and can cut off the overload current within an extremely short time, effectively protecting the equipment in the power system from being damaged by the overload current.

[0041] In the field of electrical equipment, the circuit breaker is a key device to ensure the safe and stable operation of the power system, and the precise debugging of its protection function is crucial. The traditional circuit breaker protection debugging method often relies on complex processes and cumbersome operations, with many inconveniences and limitations. The emergence of the temperature-controlled controller has brought a new solution to simplify the debugging process.

[0042] Traditional circuit breaker protection is usually designed and debugged based on current parameters. In actual operation, it is necessary to finely adjust the protection characteristics by means of thermal adjustment screws. Thermal adjustment screw debugging is an extremely complex and time-consuming process, and the debugging personnel need to have rich experience and professional knowledge. Under different working conditions, in order to make the circuit breaker accurately respond to faults such as overload and short circuit, it is necessary to repeatedly adjust the position of the thermal adjustment screws, and by changing the physical parameters of the internal structure, the threshold and action time of the current protection are adjusted. However, this method not only requires extremely high technical levels of the debugging personnel, but is also easily interfered by environmental factors such as temperature changes and mechanical vibrations, resulting in the stability and accuracy of the debugging results being difficult to guarantee. Each time when debugging a new type of circuit breaker, it is necessary to re-explore suitable debugging parameters, consuming a large amount of manpower, material resources and time costs.

[0043] The temperature-controlled controller abandons the traditional protection mode that relies on current parameters and innovatively uses temperature parameters (T1 - T2) to achieve the protection function. This transformation is of great significance because temperature is closely related to the actual operating status and fault conditions of the equipment. When the circuit breaker is overloaded, the current inside it will increase, which will then cause heat generation and temperature rise. By directly monitoring the temperature change, it can more intuitively and accurately reflect the working condition of the equipment. For example, when there is an overcurrent, the traditional method needs to first detect the current change and then implement the protection action through complex algorithms and hardware adjustments; while the temperature-controlled controller directly senses the temperature rise. Once the temperature reaches the preset threshold (T1) or the temperature change rate exceeds the set range (T1 - T2), it will immediately trigger the protection mechanism, greatly simplifying the signal detection and processing process.

[0044] When the temperature-controlled controller is applied to configure a new type of circuit breaker, the debugging process is greatly simplified. In the past, for a new type of circuit breaker, various current parameters needed to be tested and calibrated complexly, and the debugging process was cumbersome and prone to errors. Now, only the temperature rise data of the circuit breaker during overload needs to be measured. The specific operation process is as follows: Under the simulated overload condition, use a high-precision temperature sensor to monitor the temperature of the key parts of the circuit breaker in real time, record the temperature change curve from normal operation to the overload state, and obtain data such as the stable temperature value and the temperature rise rate during overload. Then, directly input these data into the temperature-controlled controller. The temperature-controlled controller is built with advanced intelligent algorithms that can automatically generate a matching protection strategy according to the input temperature rise data, perfectly cooperating with the circuit breaker to achieve the overload protection function. This process does not require complex hardware adjustments and repeated parameter tests, greatly shortening the debugging cycle, improving work efficiency, and at the same time reducing the risk of equipment failure caused by improper debugging.

[0045] By using temperature parameters to replace traditional current parameters to achieve protection, the temperature-controlled controller has shown great advantages in simplifying the debugging process, providing a practical way for the optimization and upgrade of the circuit breaker protection system, and strongly promoting the intelligent development in the field of electrical equipment.

[0046] In the process of designing and optimizing electrical equipment, reducing internal resistance and power consumption are the key points to improve equipment performance, enhance energy utilization efficiency, and extend the service life of the equipment. For the temperature-controlled controller, the significant progress made in these two aspects gives it outstanding advantages compared with traditional equipment.

[0047] The key role of removing the thermal bimetal module and welding points In traditional electrical protection devices, the thermal bimetal module is an important component for achieving overload protection. It uses two metal sheets with different coefficients of thermal expansion bonded together. When the current overload causes the temperature to rise, the thermal bimetal sheet will bend due to heat and trigger the protection action. However, the presence of the thermal bimetal module brings many adverse effects to the conductive circuit. On the one hand, the thermal bimetal module itself has a certain resistance. Although its resistance value is relatively small, in the entire conductive circuit, it still consumes part of the electrical energy, increasing the total resistance of the circuit. On the other hand, the connection between the thermal bimetal module and other components relies on welding points. Due to material characteristics and process differences at the welding points, contact resistance is likely to form. With the operation of the equipment, the welding points may also be affected by factors such as thermal expansion and contraction, mechanical vibration, etc., resulting in a further increase in contact resistance, thereby reducing the stability and reliability of the conductive circuit.

[0048] The temperature-controlled controller makes a bold innovation by removing the thermal bimetal module and related welding points. This measure brings immediate results, reducing the internal resistance of the conductive circuit by 10%. The reduction in internal resistance means that during the same current transmission process, the power loss of the electrical energy on the wire is greatly reduced. This not only saves a large amount of electrical energy but also reduces the heating degree of the wire, improving the safety and stability of the entire electrical system.

[0049] In traditional electrical control schemes, the control unit needs to undertake multiple tasks such as complex signal processing, logical judgment, and execution control, and its power consumption is usually relatively high. Take the common thermal-magnetic release as an example. The power consumption of its thermal bimetal release is often about 12W. Such a high power consumption not only increases energy consumption, leading to an increase in operating costs, but also generates a large amount of heat. If too much heat cannot be dissipated in time, it will cause the temperature of the circuit breaker to rise, affecting the performance and lifespan of the circuit breaker, and further reducing the reliability and stability of the entire equipment. In addition, in order to dissipate heat, additional heat dissipation devices need to be equipped, such as increasing the amount of copper used, which not only increases the volume and cost of the equipment but also may introduce new fault points.

[0050] The temperature-controlled controller has been deeply optimized in the design of the control unit. By using an electronic circuit or a simple MCU to achieve simple logical judgment, the overload long-delay protection function can be realized, and the internal resistance can be optimized to within 2W, only 1 / 7.5 of the traditional scheme. The low power consumption brings multiple benefits. First, it significantly reduces energy consumption. For long-term operating electrical equipment, this means considerable electricity cost savings. Second, it reduces the generation of heat and improves the temperature rise performance of the circuit breaker.

[0051] By removing the thermal bimetal module and welding points to reduce the internal resistance, and optimizing the power consumption of the control unit, the temperature-controlled controller has made a major breakthrough in performance improvement and energy utilization efficiency, opening up a new path for the development of electrical equipment.

[0052] During the operation of electrical equipment, ensuring the accuracy and reliability of protection and control functions is the core element for ensuring the stable and safe operation of the equipment. Temperature-controlled controllers have significant advantages in this regard. By directly monitoring the temperature rise value (T3), they effectively avoid the problems of electromagnetic interference and mutual inductor consistency error existing in traditional monitoring methods, thus greatly improving the accuracy and reliability of equipment operation.

[0053] Interference of electromagnetic interference on traditional monitoring: In a complex electrical environment, various electrical equipment is densely distributed, and a large number of electromagnetic signals fill the space. For traditional protection systems based on current parameter monitoring, their signal transmission lines and detection components are extremely vulnerable to electromagnetic interference. For example, the startup of nearby high-power motors, the operation of high-frequency equipment, etc. will generate strong electromagnetic radiation. These electromagnetic interferences may induce additional voltage or current on the current signal transmission line, causing the detected current signal to fluctuate and distort. When the protection system performs operations and judgments based on these interfered current signals, it is prone to misjudgment, resulting in incorrect actions of the protection device, which not only affects the normal operation of the equipment but may also trigger a chain reaction, causing faults in a larger range.

[0054] As a key component of traditional current monitoring, current transformers are used to convert large currents into small currents suitable for measurement and control. However, due to factors such as manufacturing process limitations and aging during use, there are consistency errors between different transformers. Even for transformers produced in the same batch, it is difficult to achieve exactly the same transformation ratio. When multiple transformers are used for current monitoring at different positions in the same system, this consistency error will cause deviations in the current data at each monitoring point. When analyzing the operation status of the equipment and formulating protection strategies, these inaccurate data will mislead control decisions, making the protection system unable to accurately judge whether the equipment is in a normal operation state, thereby reducing the response accuracy and reliability of the system to faults.

[0055] The temperature-controlled controller directly monitors the temperature rise value (T3) and uses temperature-sensitive sensors such as thermocouples and thermistors. The working principle of these temperature sensors is based on the conversion relationship between temperature and electrical signals and has nothing to do with the induction and transmission of electromagnetic signals. Therefore, in a complex electromagnetic environment, the temperature sensors can work stably without being affected by external electromagnetic interference. Regardless of how the surrounding electrical equipment operates and how strong electromagnetic radiation is generated, the temperature sensors can accurately sense the temperature change of the equipment and convert it into corresponding electrical signals and transmit them to the controller. This ensures that the temperature data obtained by the controller is true and reliable, providing a solid foundation for precise protection and control.

[0056] Since the temperature-controlled controller does not rely on a current transformer to obtain monitoring signals, but directly measures the temperature rise value (T3) of the equipment, it fundamentally eliminates the influence brought by the consistency error of the transformer. When faults such as overload and short circuit occur in the equipment, its temperature will rise rapidly. By directly monitoring this temperature rise value, the controller can accurately judge the operating state of the equipment without considering the current data deviation caused by the inconsistency of the transformers.

[0057] By directly monitoring the temperature rise value (T3), the temperature-controlled controller successfully avoids electromagnetic interference and the consistency error of the transformer, significantly improving the accuracy and reliability of the monitoring of the operating state of electrical equipment, providing a more powerful guarantee for the stable and safe operation of the equipment, and having broad application prospects and important promotion value in the field of electrical equipment protection and control.

[0058] In the development trend of modern electrical equipment, miniaturization and compact design have increasingly become key requirements, especially for equipment such as circuit breakers that are widely used in various links of the power system. By eliminating the transformer design, the temperature-controlled controller has made a breakthrough in terms of structural compactness, can better adapt to the needs of miniaturized circuit breakers, and provides strong support for the optimized layout and efficient operation of the power system.

[0059] For traditional transformers, whether current transformers or voltage transformers, their working principles are based on the electromagnetic induction law, and a large-sized iron core and multi-turn windings are required to achieve precise electromagnetic conversion. As the core component of electromagnetic induction, in order to ensure sufficient magnetic flux carrying capacity and low hysteresis loss, the iron core often needs to have a certain cross-sectional area and shape design, which makes the iron core itself occupy a relatively large space. And the windings need to be tightly wound around the iron core, with a large number of turns to meet different transformation ratio requirements, further increasing the overall volume of the transformer.

[0060] In addition to the volume of the transformer itself, in order to ensure its normal operation and maintenance, a certain installation and supporting space also needs to be reserved. When installing the transformer, heat dissipation issues need to be considered, so a certain air circulation space needs to be left around it; in addition, in order to protect the transformer from the influence of the external environment, a special protective shell or installation bracket may also need to be equipped, which further increases the total space occupied by the transformer inside the circuit breaker.

[0061] After the temperature-controlled controller eliminates the transformer design, the most direct effect is to free up a large amount of physical space originally occupied by the transformer inside the circuit breaker. The release of this part of the space makes it possible to optimize the layout of other components inside the circuit breaker. For example, the originally scattered control circuits and protection modules can be integrated and more compactly installed in the freed-up space, reducing the length and complexity of the internal lines, not only improving the reliability of electrical connections but also reducing the risk of electromagnetic interference.

[0062] The cancellation of the mutual inductor greatly simplifies the internal structural layout of the circuit breaker. Without having to consider the spatial coordination and electromagnetic compatibility issues between the mutual inductor and other components, designers can arrange the internal components more freely. Components such as brackets and connectors originally used for the installation and fixation of the mutual inductor can also be cancelled, further reducing the complexity of the internal structure and the number of components. This simplified structural layout not only helps improve the production and manufacturing efficiency, reduce the production cost, but also facilitates the installation, commissioning and maintenance of the equipment, and improves the overall reliability and maintainability of the equipment.

[0063] With the development of the power system towards miniaturization and integration, miniaturized circuit breakers have been widely used in many occasions, such as smart homes, small distribution boxes, distributed energy systems, etc. These application scenarios have strict restrictions on the volume of the circuit breaker, and the structural compactness achieved after the cancellation of the mutual inductor in the temperature-controlled controller just meets the demanding requirements of the miniaturized circuit breaker for the internal space. It enables the miniaturized circuit breaker to ensure perfect protection and control functions while achieving higher performance indicators within a limited space.

[0064] To meet the needs of miniaturized circuit breakers, the temperature-controlled controller not only solves the space problem, but also improves the overall performance and aesthetics of the equipment to a certain extent. Due to the more compact internal structure and optimized electrical connections, the response speed and control accuracy of the circuit breaker have been improved. At the same time, the compact appearance design makes the miniaturized circuit breaker more beautiful and tidy after installation, more coordinated with the overall style of modern homes and industrial environments, and enhances the market competitiveness of the product.

[0065] The structural compactness achieved by canceling the mutual inductor design shows significant advantages in meeting the needs of miniaturized circuit breakers, strongly promoting the development of power equipment towards miniaturization and high efficiency, and having important development potential and application value in the future construction and application of power systems.

[0066] In the manufacturing process of circuit breakers, cost control is a crucial link, and the new design shows significant advantages in this regard. Traditional circuit breakers rely on thermal bimetal trip devices and heating parts to achieve the overload protection function. The thermal bimetal trip device is usually composed of metal sheets with different coefficients of thermal expansion, and the manufacturing process is relatively complex, requiring high-precision processing technology to ensure the stable and reliable performance of the bimetal sheet. At the same time, the heating parts also need to select appropriate resistance materials to ensure that stable and required heat can be generated under the action of current to drive the thermal bimetal trip device to act, which involves the screening and special treatment of materials and further increases the cost.

[0067] The design of the new circuit breaker eliminates these components. From the perspective of material procurement, it directly reduces the procurement costs of the thermal bimetal release and heating parts. In the manufacturing process, there is no need for the complex processing procedures of the thermal bimetal release and the assembly process of the heating parts, which greatly saves labor costs and time costs. Moreover, the reduced number of components simplifies production management and reduces the cost risk caused by overstocked component inventory, comprehensively reducing the overall material cost and making the product have a stronger price advantage in the market competition.

[0068] In the field of electrical protection, the precise monitoring and control of various parameters are crucial, and the new temperature control protection scheme performs excellently in this regard.

[0069] Traditional overload protection mostly relies on current detection methods, judging whether there is an overload by monitoring the magnitude of the current. However, this method has obvious drawbacks and is extremely vulnerable to electromagnetic interference. In the actual electrical environment, in scenarios such as the startup of large motors and the operation of electric welders, strong electromagnetic noise will be generated, and these interferences will cause fluctuations or even distortions in the current detection signal, resulting in inaccurate detection results, which in turn leads to misoperation or failure to act in a timely manner, affecting the normal operation and safety protection of electrical equipment. Different from this, the new scheme directly monitors the temperature rise value T3. Temperature is a relatively stable physical quantity that is not easily affected by electromagnetic interference. The temperature T1 of the conductive system and the internal environment temperature T2 are directly measured by a high-precision temperature sensor, and T3 is calculated based on an accurate algorithm. This direct monitoring method fundamentally avoids the influence of electromagnetic interference on the detection results and can stably and accurately reflect the actual operating state of the equipment, providing a reliable basis for overload protection.

[0070] Circuit breakers of different types and specifications have differences in application scenarios and performance requirements. Relying on its direct monitoring advantage of the temperature rise value T3, the new temperature control type control unit can be accurately configured according to the characteristics of different circuit breakers. For small circuit breakers, since their application scenarios are mostly in families or small office places, the load is relatively small and stable. The control unit can accurately set the threshold of the temperature rise value T3 according to parameters such as its rated current and heat dissipation conditions, ensuring that there is no misoperation during normal operation and being able to respond quickly during overload. For large industrial circuit breakers, facing complex and changeable industrial loads and harsh electromagnetic environments, the control unit can also flexibly adjust the monitoring and control strategies according to their unique working characteristics, realizing personalized and precise protection for different circuit breakers, greatly improving the protection accuracy and applicability.

[0071] In the current situation where various electrical equipment are widely used, the circuit breaker, as a key device to ensure the safe and stable operation of the power system, the reliability of its performance and the convenience of adaptation are extremely important. The new temperature-controlled control unit has shown outstanding advantages in this regard, especially when matching with circuit breakers of different manufacturers and different models, the convenience of parameter configuration far leads traditional products.

[0072] In the actual complex electrical system, circuit breakers produced by different manufacturers have differences in design concepts, manufacturing processes, material selections, and performance parameters. Even for different models of products from the same manufacturer, their application scenarios and load characteristics are also different. In the past, configuring a suitable control unit for a circuit breaker was a cumbersome and complex task, often requiring a large amount of manpower, material resources, and time costs. Technicians not only had to deeply understand the internal structure and working principle of the circuit breaker, but also had to conduct a large number of tests and debugging work for different models to determine the appropriate control parameters, which undoubtedly increased the construction cycle and cost of the entire electrical system.

[0073] However, the new temperature-controlled control unit has completely changed this situation. Taking the example of a new model circuit breaker that needs to be configured with this control unit, the operation process has become extremely simple. First, technicians simulate the overload state that the circuit breaker may encounter during actual operation in a laboratory environment. Through professional test equipment, the temperature rise parameter T3 value of the circuit breaker at this time is accurately measured. This process relies on advanced temperature sensors and high-precision data acquisition equipment to quickly and accurately obtain the T3 value.

[0074] Subsequently, technicians only need to easily import the measured T3 value into the control unit through the simple and intuitive parameter input interface equipped with the control unit. The intelligent algorithm built into the control unit will quickly identify and process this parameter, and automatically adjust the internal control logic and protection strategy. The whole process does not require complex programming or professional debugging skills, and ordinary technicians can complete the operation after simple training.

[0075] In this way, the perfect cooperation between the control unit and the circuit breaker body can be quickly achieved, greatly improving work efficiency and reducing equipment failures and potential safety hazards caused by improper parameter configuration. Whether in the construction of a new electrical system or the upgrade and transformation of an existing system, the convenient parameter configuration characteristics of the new temperature-controlled control unit provide strong support for its wide application, making the construction and maintenance of the power system more efficient and convenient.

[0076] In the field of power equipment, the power consumption problem of the trip unit has always attracted much attention, and there are significant differences in energy consumption among different types of trip units. Now let's compare the power consumption of traditional thermal bimetal trip units and new temperature-controlled trip units in detail.

[0077] For traditional thermal bimetal circuit breakers, the power of a single device is 12 W. Calculated based on 365 days a year and 24 hours a day, its annual power consumption (per unit) is: 12 * 365 * 24 = 105,120 If 1,000,000 (here it is assumed to be 1 million) traditional thermal bimetal circuit breakers operate simultaneously, then their annual power consumption is: 1,000,000 * 105,120 = 105 million kWh (1 kWh = 1 degree) For the new type of temperature-controlled circuit breaker, the power of a single device is only 2 W. Also calculated based on 365 days a year and 24 hours a day, its annual power consumption (per unit) is: 2 * 365 * 24 = 17,520 When 1,000,000 (1 million) new type of temperature-controlled circuit breakers operate simultaneously, the annual power consumption is: 1,000,000 * 17,520 = 17 million kWh Through comparison, it can be clearly seen that for 1,000,000 (1 million) molded case circuit breakers, if the new type of temperature-controlled circuit breaker is adopted, the annual power savings can be: 105 million kWh - 17 million kWh = 88 million kWh This energy-saving effect is very significant. The savings of 88 million kWh not only mean a huge energy conservation, but also can greatly reduce the electricity cost for enterprises and society and reduce the dependence on power generation resources for enterprises and society. From an environmental protection perspective, it reduces the pollutant emissions generated by power generation and helps to promote sustainable development. In large-scale applications, the new type of temperature-controlled circuit breaker provides strong support for energy conservation and consumption reduction of the power system with its low-power consumption advantage, showing extremely high application value and promotion potential.

[0078] Optionally, the method of fault identification includes: performing overload fault identification on the temperature-controlled molded case circuit breaker based on the measured temperature parameters, or performing overload fault identification on the temperature-controlled molded case circuit breaker based on the change rate of the measured temperature parameters.

[0079] Optionally, the temperature control unit includes a temperature control switch; The short-circuit magnetic release module is electrically connected to the power supply unit and the temperature switch respectively, the power supply unit is electrically connected to the temperature control switch, and the temperature control switch is electrically connected to the magnetic release.

[0080] Optionally, the temperature control switch includes a bimetal type temperature control switch.

[0081] In the specific embodiments of this specification, a bimetallic thermostatic switch that responds precisely to temperature changes and operates reliably is selected. This thermostatic switch is composed of two metals with different coefficients of thermal expansion bonded together. When the temperature changes, due to the different degrees of expansion of the bimetallic strip, deformation occurs, thereby achieving the closing or opening action of the switch. Its operating temperature can be accurately set according to the overload protection requirements of the actual application scenario.

[0082] Optionally, it further includes: a signal amplification and processing circuit, and a delay control circuit; The thermostatic switch is electrically connected to the signal amplification and processing circuit, the signal amplification and processing circuit is electrically connected to the delay control circuit, and the delay control circuit is electrically connected to the magnetic flux release.

[0083] In the specific embodiments of this specification, when the thermostatic switch operates, the generated signal is usually relatively weak and cannot directly drive the control circuit. The signal amplification and processing circuit is responsible for amplifying the signal output by the thermostatic switch, removing noise interference, and converting it into a standard signal suitable for the control circuit to recognize. This circuit is mainly composed of electronic components such as operational amplifiers, filter capacitors, and resistors, and ensures the accuracy and stability of signal processing through reasonable parameter configuration.

[0084] The delay control circuit is a key link to achieve the overload long-delay function. After receiving the signal from the signal amplification and processing circuit, it delays according to the preset time parameters. The delay time can be flexibly set by adjusting the capacitance and resistance values in the circuit to meet the diverse requirements of different application scenarios for the overload long-delay time. For example, in some precision equipment with high sensitivity to overload, the delay time can be set shorter; while in some ordinary industrial equipment that allows short-term overload, the delay time can be appropriately extended. The delay control circuit generally adopts a design based on a 555 timer or a dedicated delay chip, and uses its internal timing logic and peripheral circuits to achieve precise delay control.

[0085] After receiving the signal output by the delay control circuit, the magnetic flux release performs corresponding control operations on the circuit, such as cutting off the circuit or sending out an alarm signal. In application scenarios such as molded case circuit breakers, it can be set as an electromagnetic release or an electronic release, and the contacts are disconnected through electromagnetic force or electric power drive to cut off the overload current and protect the safety of the circuit and equipment; in some intelligent monitoring systems, it can also be replaced with an audible and visual alarm or a communication module that sends alarm information to the monitoring center.

[0086] When the circuit is operating normally, the current is within the rated range, the heat generation is at a normal level, and the temperature control switch remains in its initial stable state of normally open or normally closed. At this time, the signal amplification and processing circuit does not receive an effective trigger signal, and both the delay control circuit and the actuator are in a standby state. The entire system does not generate any action, and the circuit continues to operate normally. When the circuit experiences an overload situation, the current exceeds the rated value, and the heat generated by the conductor due to the current thermal effect increases rapidly. As time goes by, the temperature gradually rises. When the temperature reaches the preset operating temperature of the temperature control switch, the temperature control switch instantaneously changes its state and outputs a signal. This signal is immediately transmitted to the signal amplification and processing circuit. The signal amplification and processing circuit amplifies and filters the temperature control switch signal received, removes the clutter signals generated by circuit interference, converts it into a standard electrical signal, and transmits it to the delay control circuit. The delay control circuit starts timing according to the preset delay time. During the delay period, the actuator does not act, giving the circuit a certain buffer time to avoid misoperation due to short-term current fluctuations. When the delay time ends, the delay control circuit sends a control signal to the actuator. If it is a circuit-breaking protection method, the actuator (such as an electromagnetic release) quickly acts to separate the breaker contacts and cut off the overload current, thereby protecting the circuit and equipment from further damage; if it is an alarm method, the actuator (such as an audible and visual alarm) is activated to emit an audible and visual alarm, reminding the operator to handle the overload fault in a timely manner. The alarm method is used to achieve the function of alarm without tripping.

[0087] Figure 2 FIG. 4 is a schematic structural diagram of another embedded temperature-controlled molded case circuit breaker provided by an embodiment of this specification, including: The overload temperature control tripping module includes a temperature sensing and detection unit, a flux tripping device, and an embedded control unit formed based on measured temperature parameters; The short-circuit magnetic tripping module is electrically connected to the power supply unit, the temperature sensing and detection unit, and the flux tripping device respectively. The power supply unit is electrically connected to the control unit and the temperature sensing and detection unit respectively. The temperature sensing and detection unit is electrically connected to the control unit, and the control unit is electrically connected to the flux tripping device.

[0088] Optionally, the control unit includes an STM32F407 embedded microcontroller.

[0089] In the specific implementation manner of this specification, a high-performance and low-power embedded microcontroller is selected, such as an STM32 series chip. Taking STM32F407 as an example, it has rich peripheral resources, powerful computing capabilities, and a relatively high clock frequency, and can meet complex calculation and control requirements. Its built-in high-speed Cortex-M4 core can quickly process various types of data and execute control algorithms, providing a solid foundation for the stable operation of the entire system.

[0090] Optionally, the temperature sensing and detecting unit includes a DS18B20 digital temperature sensor.

[0091] In the specific implementation of this specification, the digital temperature sensor DS18B20 is used. It has the characteristics of small volume, high precision, strong anti-interference ability, etc., and can directly communicate with the microcontroller through a single wire. The DS18B20 can monitor the temperature of key parts in the circuit in real time, transmit the temperature information to the microcontroller in the form of a digital signal, provide accurate temperature data for the system, and be used to judge whether the circuit generates overheating due to overload.

[0092] Optionally, it further includes: a communication interface module electrically connected to the overload temperature control and tripping module; the communication interface module includes an RS485 interface, an Ethernet interface, a USB interface, a LORA interface, and a ZIGBEE interface.

[0093] In the specific implementation of this specification, in order to realize the communication between the system and external devices or the host computer, multiple communication interface circuits are designed. For example, the RS485 interface is used to realize long-distance communication with other industrial devices. It uses differential signal transmission and has the advantages of strong anti-interference ability and long transmission distance; the Ethernet interface uses a W5500 chip, enabling the system to access the local area network, facilitating remote monitoring and data transmission; in addition, a USB interface is reserved for fast data transmission and device upgrade and maintenance.

[0094] To ensure the stable operation of each part of the system, an efficient power management circuit is designed. A switching power supply chip is used to convert the externally input power into different voltage levels required by the system, such as 3.3V, 5V, etc. At the same time, voltage stabilization and filtering circuits are added to eliminate the noise and fluctuations in the power supply, providing stable and pure power for the core processor, sensors, and other peripheral devices.

[0095] To improve the stability and task management ability of the system, a real-time operating system, such as FreeRTOS, is transplanted. FreeRTOS has the characteristics of a small kernel, being customizable, and strong real-time performance, and can conveniently manage multiple tasks in the system. In the system, multiple tasks are created, such as current acquisition tasks, temperature acquisition tasks, data processing tasks, communication tasks, etc. Each task has an independent priority and execution cycle. Through the scheduling mechanism of the RTOS, it is ensured that each task can run in an orderly manner.

[0096] In the temperature acquisition task, the temperature data of the temperature sensor is read regularly. The data processing task judges whether the circuit is in an overloaded state according to the acquired current and temperature data and the preset overload judgment algorithm. For example, when the temperature exceeds the safe range, it is determined to be overloaded.

[0097] For overload situations, implement corresponding control algorithms. When overload is detected, different measures are taken according to the severity of the overload and preset strategies. For example, for mild overload, warning information can be sent to the host computer through the communication interface; for severe overload, the actuator is immediately controlled to cut off the circuit to protect the safety of the equipment. At the same time, information such as the time of overload occurrence, current value, and temperature value is recorded for subsequent analysis and fault troubleshooting.

[0098] In the communication task, implement driver programs and communication protocols for different communication interfaces. For RS485 communication, follow the MODBUS protocol to implement data packing, sending, and receiving parsing; for Ethernet communication, use the TCP / IP protocol stack to implement data interaction with the host computer or cloud platform. The real-time temperature data and device status information can be uploaded to the server, and at the same time, control instructions sent by the host computer are received to achieve remote control and monitoring.

[0099] In the present invention, by accurately perceiving the main circuit conduction system of the circuit breaker and the ambient temperature, key temperature parameters are obtained, and advanced algorithms are used to deeply analyze and process these parameters, thereby realizing the dynamic adjustment of protection characteristics. This innovative technology not only breaks through the bottleneck of traditional technologies but also opens up a new direction for the development of molded case circuit breakers. It can adapt to more complex and changeable power operation environments, meet the stringent requirements of emerging fields such as industrial automation production and new energy access for distribution equipment, and significantly enhance the safety and reliability of the system while improving the operation efficiency of the power system.

[0100] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the present invention is not inherently related to any specific computer, virtual device, or electronic device, and various general-purpose devices can also implement the present invention. The above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0101] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

[0102] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims

1. A temperature-controlled plastic case circuit breaker, characterized in that, Including: A short-circuit magnetic trip module (100) and an overload temperature-controlled trip module (200); The overload temperature-controlled trip includes a power supply unit (21), a magnetic flux trip device (23), and a temperature control unit; the short-circuit magnetic trip module (100) is electrically connected to the power supply unit (21), and the power supply unit (21) is electrically connected to the temperature control unit.

2. The temperature-controlled plastic case circuit breaker according to claim 1, characterized in that, Fault identification methods include: performing overload fault identification on the temperature-controlled molded case circuit breaker based on measured temperature parameters, or performing overload fault identification on the temperature-controlled molded case circuit breaker based on the change rate of measured temperature parameters.

3. The temperature-controlled plastic case circuit breaker according to claim 1, wherein The temperature control unit includes a temperature control switch (22); the short-circuit magnetic trip module (100) is electrically connected to the power supply unit (21) and the temperature switch respectively, the power supply unit (21) is electrically connected to the temperature control switch (22), and the temperature control switch (22) is electrically connected to the magnetic flux trip device (23).

4. The temperature-controlled plastic case circuit breaker according to claim 3, characterized in that, The temperature control switch (22) includes a bimetal type temperature control switch (22).

5. The thermostatic plastic case circuit breaker according to claim 3, characterized in that, It also includes: A signal amplification and processing circuit and a delay control circuit; The temperature control switch (22) is electrically connected to the signal amplification and processing circuit, the signal amplification and processing circuit is electrically connected to the delay control circuit, and the delay control circuit is electrically connected to the magnetic flux trip device (23).

6. The temperature-controlled plastic case circuit breaker according to claim 1, characterized in that, The overload temperature-controlled trip module (200) includes a temperature sensing and detection unit (25), a magnetic flux trip device (23), and an embedded control unit (24) formed based on measured temperature parameters; The short-circuit magnetic trip module (100) is electrically connected to the power supply unit (21), the temperature sensing and detection unit (25), and the magnetic flux trip device (23) respectively, the power supply unit (21) is electrically connected to the control unit (24) and the temperature sensing and detection unit respectively, the temperature sensing and detection unit (25) is electrically connected to the control unit (24), and the control unit (24) is electrically connected to the magnetic flux trip device (23).

7. The thermostatic plastic case circuit breaker according to claim 6, wherein, The control unit (24) includes an STM32F407 embedded microcontroller.

8. The thermostatic plastic case circuit breaker according to claim 7, characterized in that, The temperature sensing and detection unit (25) includes a DS18B20 digital temperature sensor.

9. The temperature-controlled plastic case circuit breaker according to claim 8, characterized in that, It also includes: A communication interface module (26) electrically connected to the overload temperature-controlled trip module (200); the communication interface module (26) includes an RS485 interface, an Ethernet interface, a USB interface, a LORA interface, and a ZIGBEE interface.

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