Primary and secondary separation type residual current circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a primary and secondary separation type residual current circuit breaker, which comprises a primary component and a secondary component which are detachably connected, the primary component comprises a release; a residual current transformer; the secondary component comprises a protection core which is mainly used for realizing the protection function of the circuit breaker, is connected with the residual current transformer and the release and is used for controlling the release according to the residual current detected by the residual current transformer; and the intelligent core mainly realizes an intelligent control function, is connected with the protection core, and is used for sending the obtained newly added, deleted or modified protection instruction, logic strategy and parameter to the protection core, so that the protection core controls the release according to the corresponding protection instruction, logic strategy and parameter. According to the technical scheme, the overall investment and the operation and maintenance cost are effectively reduced, and meanwhile, the core protection function of the circuit breaker cannot be influenced by any accident in intelligent service operation.

Description

Technical Field

[0001] This disclosure relates to the field of circuit breaker technology, and specifically to a primary and secondary separated residual current circuit breaker. Background Technology

[0002] Modern smart distribution IoT integrates digital technology and coordinates the "source, grid, load, and storage" systems, possessing multiple functions such as intelligent status monitoring, intelligent fault handling, hierarchical local control, and intelligent self-healing of active distribution networks. Residual current circuit breakers, as core devices on the "end" side of the distribution IoT, are crucial for achieving comprehensive grid status perception, operational safety protection, comprehensive equipment management, and coordinated linkage of "source, grid, load, and storage." Especially when distributed power sources / energy storage are integrated, the collaborative computing power and intelligent control of corresponding nodes are vital to the robustness and reliability of the low-voltage distribution network.

[0003] Existing residual current circuit breakers integrate the primary and secondary sides. Due to the strong magnetic field of the primary side, the accuracy of the measurement circuit of the secondary side and the overall EMC (Electromagnetic Compatibility) performance are affected. Under high current, dangerous conditions such as component short circuits, arcing, and equipment smoke may occur, seriously affecting equipment and on-site operation safety. Moreover, upgrading and maintenance are inconvenient. When the controller on the secondary side is damaged / upgraded or expires for replacement, the power must be cut off before the whole machine can be replaced. This involves the power company's annual power outage plan and cannot be arbitrarily interrupted to replace the switch, making maintenance inconvenient. Utility Model Content

[0004] To address the problems in the related technologies, this disclosure provides a primary and secondary separation type residual current circuit breaker.

[0005] In a first aspect, this disclosure provides a primary and secondary separated residual current circuit breaker, including a detachably connected primary component and a secondary component;

[0006] The primary component includes:

[0007] Trip unit;

[0008] A residual current transformer is used to detect the residual current in a circuit and transmit the detected residual current to secondary components.

[0009] The secondary component includes:

[0010] The protection core mainly realizes the protection function of the residual current circuit breaker. It connects the residual current transformer and the trip unit and is used to control the trip unit according to the residual current detected by the residual current transformer.

[0011] The smart chip mainly realizes the intelligent control function. It is connected to the protection chip and is used to send the acquired new, deleted or modified protection instructions, logic strategies and parameters to the protection chip, so that the protection chip controls the trip unit according to the protection instructions, logic strategies and parameters. The protection chip sends the protection control result to the smart chip.

[0012] In one possible implementation, the secondary component further includes:

[0013] The control module set includes one or more modules, each module being connected to the smart chip and used to cooperate with the smart chip to realize the smart control function corresponding to the residual current circuit breaker. When realizing the smart control function corresponding to the residual current circuit breaker, the smart chip and the protection chip cooperate.

[0014] In one possible implementation, the control module includes at least one of the following modules: a display and setting module, a power quality module, a routing management module, an IoT communication module, a protection communication module, and a topology identification module; wherein:

[0015] The display setting module is also connected to the protection chip and is used to set the protection parameters of the protection chip; the display setting module is also used to obtain data from the smart chip and perform data display, data viewing, data recording and data query.

[0016] The power quality module is connected to the residual current sampling circuit and voltage sampling circuit in the secondary component. It is used to collect the power data collected and output by the residual current sampling circuit and voltage sampling circuit, and call the smart chip to perform power quality analysis based on the power data, and record the power quality analysis results output by the smart chip.

[0017] The routing management module is connected to the communication module in the secondary component. It is used to send outgoing messages from each module in the control module set through the communication module, manage the communication resources between each module in the control module set, and support the communication message forwarding and message broadcasting functions between each module. It also receives update installation packages from each module or smart chip through the communication module to perform online upgrades on each module and smart chip.

[0018] The IoT communication module connects the communication module and the encryption module in the secondary component. It is used to call the encryption module through the smart chip to encrypt and encapsulate the messages sent by the communication module, and to decapsulate and decrypt the messages received by the communication module. It is also used to manage the communication module.

[0019] The protection communication module is connected to the human-machine interface panel in the secondary component, obtains the new protection logic strategy input by the user from the human-machine interface panel, and sends the new protection logic strategy to the protection chip through the smart chip, so that the protection chip controls the trip unit according to the new protection logic strategy.

[0020] The topology identification module is used to call the smart chip to realize the topology identification function of the power grid where the residual current circuit breaker is located.

[0021] In one possible implementation, the secondary component further includes:

[0022] A residual current sampling circuit, connected to the residual current transformer and the protection core, is used to sample the residual current detected by the residual current transformer and send the sampled residual current to the protection core so that the protection core can control the trip unit according to the sampled residual current.

[0023] A tripping control circuit connects the protective core and the trip unit, and the protective core controls the trip unit through the tripping control circuit.

[0024] In one possible implementation, the secondary component further includes:

[0025] A relay control circuit is connected to a protection core, and the protection core controls the power supply of the relay corresponding to the residual current circuit breaker through the relay control circuit.

[0026] The primary component also includes:

[0027] The motor is connected to the relay and the trip unit. When the relay is energized, it controls the motor to drive the trip unit to reset.

[0028] In one possible implementation, the primary component further includes:

[0029] The incoming line voltage detection module is used to detect the incoming line voltage on the primary side of the residual current circuit breaker and transmit the detected incoming line voltage to the voltage sampling circuit in the secondary component for sampling.

[0030] The voltage sampling circuit is connected to the protection core and is used to send the sampled voltage to the protection core so that the protection core can control the trip unit according to the sampled voltage.

[0031] In one possible implementation, the primary component further includes:

[0032] The incoming and outgoing line temperature detection module is used to detect the temperature of the incoming and outgoing line connection points of the residual current circuit breaker;

[0033] The secondary component also includes:

[0034] A temperature acquisition circuit, connected to the protection core, is used to acquire the temperature detected by the incoming and outgoing line temperature detection module and send the acquired temperature to the protection core so that the protection core can control the trip unit according to the acquired temperature.

[0035] In one possible implementation, the secondary component further includes a human-machine interface panel, which connects the protection chip and the smart chip. The human-machine interface panel includes at least one of a display, an indicator light, a button, and a switch.

[0036] In one possible implementation, the primary component further includes: a protective current transformer;

[0037] The secondary component also includes:

[0038] The current transformer power supply circuit is connected to the protective current transformer and is used to draw power from the protective current transformer and supply power to the secondary components.

[0039] In one possible implementation, the secondary component further includes:

[0040] The circuit breaker opening and closing status detector is connected to the protection core and the smart core. It is used to obtain the opening and closing status of the residual current circuit breaker from the protection core. The opening and closing status includes whether the circuit breaker is open or closed. The detector then sends the opening and closing status of the residual current circuit breaker to the smart core.

[0041] In one possible implementation, it also includes:

[0042] A communication module, connected to the smart chip, is used to communicate with external devices under the control of the smart chip.

[0043] According to the technical solution provided in this disclosure, the primary and secondary components can be set up separately, and both can operate relatively independently, avoiding the influence of the strong magnetic field of the primary component on the secondary component. In case of failure, either the primary or secondary component can be replaced separately without powering on, reducing maintenance costs. In addition, in existing products, the secondary components have different specifications and dimensions for different current specifications; the larger the current specification, the larger the current transformer size. However, this disclosure adopts a primary and secondary separation design, with the current transformer placed on the primary side, which allows for standardized and unified design of the secondary component size, effectively reducing manufacturing costs. At the same time, since the primary and secondary components have different lifespans, this separation design effectively solves the problem of replacing the entire unit and wasting investment caused by the expiration of the lifespan of a single component or problems occurring midway. Moreover, this residual current circuit breaker adopts a dual-core scheme of protection core and smart core. The protection core can control the trip unit based on the residual current detected by the residual current transformer, serving the protection function of the residual current circuit breaker. The smart core serves the intelligent management function of the residual current circuit breaker, ensuring that even if the smart core encounters any unexpected events during operation, the core protection function of the residual current circuit breaker will not be affected.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0045] Other features, objects, and advantages of this disclosure will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0046] Figure 1 This diagram illustrates a structural block diagram of a primary and secondary separated residual current circuit breaker according to an embodiment of the present disclosure.

[0047] Figure 2 This diagram illustrates a structural block diagram of another type of primary and secondary separated residual current circuit breaker provided in an embodiment of the present disclosure. Detailed Implementation

[0048] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement them. Furthermore, for clarity, portions unrelated to the description of exemplary embodiments have been omitted from the drawings.

[0049] In this disclosure, it should be understood that terms such as “comprising” or “having” are intended to indicate the presence of features, figures, steps, behaviors, components, parts or combinations thereof disclosed in this specification, and are not intended to exclude the possibility of the presence or addition of one or more other features, figures, steps, behaviors, components, parts or combinations thereof.

[0050] It should also be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] Figure 1 This diagram illustrates a structural block diagram of a primary and secondary separated residual current circuit breaker according to an embodiment of this disclosure. Figure 1 As shown, the primary and secondary separated residual current circuit breaker includes a detachably connected primary component 10 and a secondary component 20.

[0052] like Figure 1 As shown, the primary component 10 includes a trip unit 101 and a residual current transformer 102. The trip unit 101 is mechanically connected to the circuit breaker and is used to release the holding mechanism and automatically disconnect the circuit breaker. Its function is to cut off the power supply through the trip unit 101 when leakage current is detected or electric shock occurs, thereby providing protection against electric shock and leakage current. The main function of the residual current transformer 102 is to collect the residual current on the primary side of the circuit where the circuit breaker is located and transmit the detected residual current to the secondary component 20.

[0053] like Figure 1 As shown, the secondary component 20 includes a protection core 201, which mainly implements the protection function of the residual current circuit breaker. This protection function refers to the protection function of disconnecting the circuit in the event of dangerous situations such as electric shock or leakage. The protection core 201 connects the residual current transformer 102 and the trip unit 101. The protection core 201 can control the trip unit 101 based on the residual current detected by the residual current transformer 102. If the residual current detected by the residual current transformer 102 exceeds a preset safety threshold, the protection core 201 will control the trip unit 101 to trip, causing the circuit breaker to disconnect the circuit, thereby preventing electric shock accidents or electrical fires. Of course, it should be noted that in addition to controlling the trip unit 101 based on the residual current detected by the residual current transformer, the protection core 201 can also control it based on voltage, temperature, etc., which is not limited here.

[0054] like Figure 1As shown, the secondary component 20 also includes a smart chip 202. The smart chip 202 primarily implements intelligent control functions, including analysis, statistics, and calculation of various data (such as current, voltage, and various events), as well as control functions for other services such as communication. The smart chip 202 is connected to the protection chip 201 and is used to send newly acquired, deleted, or modified protection instructions, logic strategies, and parameters to the protection chip 201, enabling the protection chip 201 to control the trip unit 101 according to the protection instructions, logic strategies, and parameters. The protection chip 201 can also send protection control results (such as circuit breaker disconnection) to the smart chip 202. It should be noted that the protection instruction can be a new, deleted, or modified instruction of a logic strategy. This logic strategy can be a judgment strategy for whether to disconnect the residual current circuit breaker; for example, it can be to disconnect the residual current circuit breaker when the residual current exceeds the residual current threshold. The parameter can be a parameter in the logic strategy, such as the residual current threshold.

[0055] This embodiment separates the primary and secondary components, allowing both to operate relatively independently and preventing the secondary component from being affected by the strong magnetic field of the primary component. In case of a fault, either the primary or secondary component can be replaced separately without powering on, reducing maintenance costs. Furthermore, existing products have different secondary component dimensions for different current ratings, with larger current ratings requiring larger current transformers. This disclosure uses a primary-secondary separation design, placing the current transformer on the primary side, allowing for standardized and unified design of the secondary component dimensions, significantly reducing manufacturing costs. Simultaneously, since the primary and secondary components have different lifespans, this separation design effectively solves the problem of wasted investment and replacement of the entire unit due to the expiration of a single component's lifespan or mid-life problem. Moreover, this residual current circuit breaker employs a dual-core scheme of protection core and intelligent core. The protection core controls the trip unit based on the residual current detected by the residual current transformer, serving the protection function of the residual current circuit breaker. The intelligent core serves the intelligent management function of the residual current circuit breaker, ensuring that even if the intelligent core encounters any unexpected events during operation, the core protection function of the residual current circuit breaker will not be affected.

[0056] In one possible implementation, Figure 2 This diagram illustrates a structural block diagram of another primary and secondary separated residual current circuit breaker provided in an embodiment of the present disclosure, as shown below. Figure 2As shown, the secondary component 20 also includes a control module set 203, which includes one or more modules. Each module is connected to the smart chip 202 and is used to cooperate with the smart chip 202 to realize the smart control function corresponding to the residual current circuit breaker. When realizing the smart control function corresponding to the residual current circuit breaker, the smart chip and the protection chip can also cooperate. The modules in the control module set are implemented on the hardware of the secondary component 20 in combination with software programs. Different modules can be expanded according to different actual needs, which is faster than the existing expansion needs that can only be achieved by reprogramming the chip.

[0057] In one possible implementation, the control module set 203 includes at least one of the following modules: display setting module 2031, power quality module 2032, routing management module 2033, IoT communication module 2034, protection communication module 2035, and topology identification module 2036.

[0058] The display setting module 2031 is also connected to the protection core 201, and can set the protection parameters of the protection core 201, such as setting some protection parameters that need to be set, such as current threshold, so that when the residual current detected by the protection core 201 exceeds the current threshold, it controls the trip unit 101 to trip, causing the circuit breaker to disconnect. The display setting module 2031 is also used to obtain data from the smart core 202 and perform data display, data viewing, and data recording. For example, it can display, record, and query the power data statistically collected by the smart core 202.

[0059] The power quality module 2032 connects to the residual current sampling circuit and voltage sampling circuit in the secondary component 20. It collects real-time power data such as voltage, current, frequency, phase, power factor, and energy from the residual current and voltage sampling circuits. It then calls the smart chip 202 to perform power quality analysis based on this data and records the results. For example, the smart chip 202 can calculate and analyze harmonic content and harmonic content rate based on the corresponding power data; it can also statistically analyze the daily maximum and minimum voltage values ​​and the daily minimum current values, record power outages / restorations, and has an event recording function, such as recording self-diagnostic events and power outage / restoration events. It also supports minute-based, day-based, and month-based data freezing. It should be noted that the data calculated and statistically analyzed by the smart chip 202 can be displayed by the display settings module.

[0060] The routing management module 2033 is connected to the communication module 213 in the secondary component 20. It is used to send outgoing messages from each module in the control module set, such as messages to other circuit breakers or external devices, via the communication module 213; manage communication resources between modules in the control module set, including pipes and shared memory; support message forwarding and broadcasting between modules; and receive update installation packages for each module or the smart chip 202 from external devices via the communication module 213, using these update packages to perform online upgrades for each module and the smart chip 202. Compared to existing iterative upgrades that require a complete re-burning of the entire package, the upgrade scheme of this embodiment is faster.

[0061] The IoT communication module 2034 connects the communication module 213 and the encryption module 214 (which can be an encryption chip) in the secondary component 20. It is used by the smart chip 202 to call the encryption module 214 to encrypt and encapsulate messages sent by the communication module 213, such as outgoing messages, providing information security protection. It also decapsulates and decrypts messages received by the communication module 213 and manages the communication module 213, such as setting communication parameters. It supports RS485, HPLC, and Bluetooth communication channels; supports the DLT645 communication protocol; and can automatically convert between internal data and northbound communication protocols.

[0062] The protection communication module 2035 is connected to the human-machine interface panel 210 in the secondary component 20. It obtains new protection logic policies input by the user from the human-machine interface panel 210 and sends these policies to the protection core 201 via the smart chip 202, so that the protection core 201 controls the trip unit 101 according to the new protection logic policies. For example, if a user needs to disconnect the circuit breaker at a certain time, they can input the new protection logic policy "disconnect the circuit breaker at a predetermined time" through the human-machine interface panel 210. The protection communication module can then send this new protection logic policy to the protection core 201 via the smart chip 202, so that the protection core 201 controls the trip unit 101 to trip at the predetermined time, disconnecting the circuit breaker. Of course, the protection communication module 2035 can also receive data from other nodes, such as policy information and real-time electrical parameters of other nodes, from external devices through the communication module 213. It will also generate records based on the execution results of the newly added protection logic strategy, and support monitoring functions for various data such as memory failure, ADC acquisition circuit failure, terminal or contact temperature, number of operations / contact wear, etc. Among them, the ADC acquisition circuit failure can be detected by the internal monitoring circuit and sent to the protection communication module. The various data such as terminal or contact temperature, number of operations / contact wear, etc. can be obtained by the internal circuit periodically detection, or can be monitored by the external device and sent to the protection communication module through the communication module 213.

[0063] The topology identification module 2036 is used to call the smart chip 202 to realize the topology identification function of the power grid where the residual current circuit breaker is located. The topology identification function includes time synchronization (i.e., clock alignment of the circuit breaker), clearing topology information, and querying topology information; it supports related operations such as topology data modulation (e.g., carrier modulation), transmission and reception, and recording, and can analyze the topology.

[0064] In one possible implementation, the secondary component 20 further includes:

[0065] The residual current sampling circuit 204 is connected to the residual current transformer 102 and the protection core 201. It is used to sample the residual current detected by the residual current transformer 102 and send the sampled residual current to the protection core 201 so that the protection core 201 controls the trip unit 101 according to the sampled residual current.

[0066] The trip control circuit 205 connects the protection core 201 and the trip unit 101. The protection core 201 controls the trip unit 101 through the trip control circuit 205.

[0067] In this embodiment, the residual current sampling circuit 204 in the secondary component 20 can sample the residual current detected by the residual current transformer 102 in the primary component 10. The protection core 201 can obtain the sampled residual current from the residual current sampling circuit 204. When the sampled residual current exceeds a predetermined threshold, the protection core 201 can control the trip unit 101 to trip through the trip control circuit 205 to disconnect the residual current circuit breaker.

[0068] In one possible implementation, the secondary component 20 further includes:

[0069] The relay control circuit 206 is connected to the protection core 201. The protection core 201 controls the relay 207 corresponding to the residual current circuit breaker to be energized through the relay control circuit 206.

[0070] The primary component 10 also includes:

[0071] Motor 103 is connected to relay 207 and trip unit 101. When relay 207 is energized, it controls motor 103 to drive trip unit 101 to reset.

[0072] In this embodiment, the residual current circuit breaker can be automatically reset after it is tripped. For example, if the protection logic strategy stored in the protection core 201 is to reset after a predetermined time after tripping, the protection core 201 can control the relay corresponding to the residual current circuit breaker to be energized through the relay control circuit 206. After the relay is energized, it will control the motor 103 to drive the trip unit 101 to reset, and the residual current circuit breaker will start working again.

[0073] In one possible implementation, the primary component 10 further includes:

[0074] The incoming line voltage detection module 104 is used to detect the incoming line voltage on the primary side of the residual current circuit breaker and transmit the detected incoming line voltage to the voltage sampling circuit 208 in the secondary component 20 for sampling.

[0075] The voltage sampling circuit 208 is connected to the protection core 201 and is used to send the sampled voltage to the protection core 201 so that the protection core 201 can control the trip unit 101 according to the sampled voltage.

[0076] In this embodiment, the incoming line voltage detection module 104 can be a voltage sensor that can detect the incoming line voltage on the primary side of the residual current circuit breaker. The voltage sampling circuit 208 can collect the voltage detected by the incoming line voltage detection module 104 and send the sampled voltage to the protection core 201. The protection core 201 determines whether the sampled voltage exceeds the preset safety range. Too high or too low voltage will damage the circuit breaker. If it is not within the preset safety range, the protection core 201 can control the trip unit 101 to trip.

[0077] In one possible implementation, the primary component 10 further includes:

[0078] The incoming and outgoing line temperature detection module 105 is used to detect the temperature of the incoming and outgoing line connection points on the primary side of the residual current circuit breaker.

[0079] The secondary component 20 also includes:

[0080] Temperature acquisition circuit 209 is connected to temperature acquisition circuit and protection core 201. It is used to acquire the temperature detected by the incoming and outgoing line temperature detection module 105 and send the acquired temperature to protection core 201 so that protection core 201 can control trip unit 101 according to the acquired temperature.

[0081] In this embodiment, the incoming and outgoing line temperature detection module 105 can be a temperature sensor that can detect the temperature of the incoming and outgoing line connection points of the residual current circuit breaker. The temperature acquisition circuit 209 can acquire the temperature detected by the incoming and outgoing line temperature detection module 105 and send the acquired temperature to the protection core 201. The protection core 201 determines whether the acquired temperature exceeds a preset safety threshold. If it does, it indicates that there may be an overheating problem, such as poor contact or excessive load. At this time, the protection core 201 can control the trip unit 101 to trip.

[0082] In one possible implementation, the secondary component 20 further includes a human-machine interface panel 210, which connects the protection chip 201 and the smart chip 202. The human-machine interface panel 210 includes at least one of a display, an indicator light, a button, and a switch.

[0083] The display can be an LCD screen used to display various data during the circuit breaker's operation, which can be obtained from the smart chip 202 and the protection chip 201. The indicator light can be used to indicate the operating status of the residual current circuit breaker, which can be obtained from the protection chip 201 or the smart chip 202. The buttons can be up, down, left, right, confirm, return, leakage test, etc., used to input corresponding commands to the display. The switch can be a manual / automatic toggle switch, which can switch the control mode of the residual current circuit breaker. The control modes of the residual current circuit breaker include manual control mode and automatic control mode. The switch can switch between these two modes. If switched to manual control mode, the user needs to manually disconnect and reset the circuit breaker. If switched to automatic control mode, the circuit breaker can be automatically disconnected and automatically reset under the control of the protection chip 201.

[0084] In one possible implementation, the primary component 10 includes a protective current transformer 106;

[0085] The secondary component 20 includes:

[0086] The current transformer power supply circuit 211 is connected to the protective current transformer 106 and is used to draw power from the protective current transformer 106 and supply power to the secondary component 20.

[0087] In this embodiment, the current transformer is a technology that uses the principle of electromagnetic induction to induce AC voltage from the primary side, and then uses it to power the electronic circuits on the secondary side after rectification, filtering and voltage regulation.

[0088] In one possible implementation, the secondary component 20 further includes:

[0089] The circuit breaker opening and closing status detector 212 is connected to the protection core 201 and the smart core 202. It is used to obtain the opening and closing status of the residual current circuit breaker from the protection core 201. The opening and closing status includes whether the circuit breaker is open or closed. The detector 212 then sends the circuit breaker opening and closing status to the smart core 202.

[0090] In this embodiment, after the control trip unit 101 trips or resets, the protection core 201 can notify the trip and closing status detector 212 of the residual current circuit breaker's trip and closing status. The trip and closing status detector 212 can send the residual current circuit breaker's trip and closing status to the smart core 202. The smart core 202 can control the indicator lights in the human-machine interface panel 210 to indicate the residual current circuit breaker's trip and closing status.

[0091] In one possible implementation, the secondary component 20 further includes:

[0092] The communication module 213 is connected to the smart chip 202 and is used to communicate with external devices under the control of the smart chip 202.

[0093] In this embodiment, the communication module 213 can receive and send various information through communication methods such as power line carrier, RS-485, and Bluetooth, such as communication between upstream and downstream nodes in the power grid.

[0094] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this disclosure is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalent features without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features disclosed in this disclosure that have similar functions.

Claims

1. A residual current circuit breaker with primary and secondary separation, characterized in that, Includes detachable primary and secondary components; The primary component includes: Trip unit; A residual current transformer is used to detect the residual current on the primary side of a circuit and transmit the detected residual current to the secondary components. The secondary component includes: The protection core mainly realizes the protection function of the residual current circuit breaker. It connects the residual current transformer and the trip unit and is used to control the trip unit according to the residual current detected by the residual current transformer. The smart chip mainly realizes the intelligent control function. It is connected to the protection chip and is used to send the acquired new, deleted or modified protection instructions, logic strategies and parameters to the protection chip, so that the protection chip controls the trip unit according to the protection instructions, logic strategies and parameters. The protection chip sends the protection control result to the smart chip.

2. The residual current circuit breaker according to claim 1, characterized in that, The secondary component also includes: The control module set includes one or more modules, each module being connected to the smart chip and used to cooperate with the smart chip to realize the smart control function corresponding to the residual current circuit breaker. When realizing the smart control function corresponding to the residual current circuit breaker, the smart chip and the protection chip cooperate.

3. The residual current circuit breaker according to claim 2, characterized in that, The control module includes at least one of the following modules: a display and setting module, a power quality module, a routing management module, an IoT communication module, a protection communication module, and a topology identification module; wherein: The display setting module is connected to the protection chip and is used to set the protection parameters of the protection chip; the display setting module is also used to acquire data from the smart chip and perform data display, data viewing, data recording and data query. The power quality module is connected to the residual current sampling circuit and voltage sampling circuit in the secondary component. It is used to collect the power data collected and output by the residual current sampling circuit and voltage sampling circuit, and call the smart chip to perform power quality analysis based on the power data, and record the power quality analysis results output by the smart chip. The routing management module is connected to the communication module in the secondary component. It is used to send outgoing messages from each module in the control module set through the communication module, manage the communication resources between each module in the control module set, and support the communication message forwarding and message broadcasting functions between each module. It also receives update installation packages from each module or smart chip through the communication module to perform online upgrades on each module and smart chip. The IoT communication module connects the communication module and the encryption module in the secondary component. It is used to call the encryption module through the smart chip to encrypt and encapsulate the messages sent by the communication module, and to decapsulate and decrypt the messages received by the communication module. It is also used to manage the communication module. The protection communication module is connected to the human-machine interface panel in the secondary component. It is used to obtain the new protection logic strategy input by the user from the human-machine interface panel, and send the new protection logic strategy to the protection chip through the smart chip, so that the protection chip controls the trip unit according to the new protection logic strategy. The topology identification module is used to call the smart chip to realize the topology identification function of the power grid where the residual current circuit breaker is located.

4. The residual current circuit breaker according to claim 1, characterized in that, The secondary component also includes: A residual current sampling circuit, connected to the residual current transformer and the protection core, is used to sample the residual current detected by the residual current transformer and send the sampled residual current to the protection core so that the protection core can control the trip unit according to the sampled residual current. A tripping control circuit connects the protective core and the trip unit, and the protective core controls the trip unit through the tripping control circuit.

5. The residual current circuit breaker according to claim 1, characterized in that, The secondary component also includes: A relay control circuit is connected to a protection core, and the protection core controls the power supply of the relay corresponding to the residual current circuit breaker through the relay control circuit. The primary component also includes: The motor is connected to the relay and the trip unit. When the relay is energized, it controls the motor to drive the trip unit to reset.

6. The residual current circuit breaker according to claim 3, characterized in that, The primary component also includes: The incoming line voltage detection module is used to detect the incoming line voltage on the primary side of the residual current circuit breaker and transmit the detected incoming line voltage to the voltage sampling circuit in the secondary component for sampling. The voltage sampling circuit is connected to the protection core and is used to send the sampled voltage to the protection core so that the protection core can control the trip unit according to the sampled voltage.

7. The residual current circuit breaker according to claim 1, characterized in that, The primary component also includes: The incoming and outgoing line temperature detection module is used to detect the temperature of the incoming and outgoing line connection points on the primary side of the residual current circuit breaker. The secondary component also includes: A temperature acquisition circuit is connected to the incoming / outgoing line temperature detection module and the protection core. It is used to acquire the temperature detected by the incoming / outgoing line temperature detection module and send the acquired temperature to the protection core so that the protection core can control the trip unit according to the acquired temperature.

8. The residual current circuit breaker according to claim 1, characterized in that, The secondary component also includes a human-machine interface panel, which connects the protection chip and the smart chip. The human-machine interface panel includes at least one of a display, indicator light, button, and switch.

9. The residual current circuit breaker according to claim 1, characterized in that, The primary component also includes: a protective current transformer; The secondary component also includes: The current transformer power supply circuit is connected to the protective current transformer and is used to draw power from the protective current transformer and supply power to the secondary components.

10. The residual current circuit breaker according to claim 1, characterized in that, The secondary component also includes: A circuit breaker status detector is connected to the protection core and the smart core. It is used to obtain the circuit breaker status of the residual current circuit breaker from the protection core. The circuit breaker status includes an open state and a closed state. The circuit breaker status is then sent to the smart core. A communication module, connected to the smart chip, is used to communicate with external devices under the control of the smart chip.

Images