An electric leakage protection device and power supply system
By designing a leakage current protection device that includes detection circuits, switching circuits, and control circuits, the problem of poor compatibility with different power supply systems in the prior art is solved, and leakage current protection for multiple power supply systems is realized, thereby improving the safety and adaptability of power supply lines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN ANKEXUCHUANG TECHNOLOGY CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-26
AI Technical Summary
Existing AC power supply system leakage protection modules are difficult to adapt to the needs of different power supply systems, resulting in an inability to uniformly adapt to the leakage protection requirements of multiple power supply systems.
Design a leakage current protection device, including a detection circuit, a switching circuit, and a control circuit. The detection circuit detects leakage current in the power supply line and generates a leakage current detection signal. The control circuit controls the switching module in the switching circuit to disconnect the power supply line with leakage current, thereby achieving adaptability to different power supply systems.
It meets the leakage protection requirements of different AC power supply systems, improves the safety and adaptability of power supply lines, and reduces signaling overhead and resource consumption.
Smart Images
Figure CN224418427U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power supply circuit technology, and in particular to a leakage current protection device and power supply system. Background Technology
[0002] Existing AC power supply systems can be categorized by power supply type into: TT systems, TN systems, and IT systems. Each type of AC power supply system typically integrates a residual current device (RCD) module into the circuit breaker to provide leakage protection. When the RCD module detects a leakage in the AC power supply system, it can control the circuit breaker to cut off the current to the AC power supply system.
[0003] However, because the residual current circuit breaker (RCCB) integrated into circuit breakers is designed for AC power supply systems used in different AC power grids, it is difficult for a single RCCB to adapt to the RCCB protection requirements of different AC power supply systems. Therefore, how to better adapt to the RCCB protection requirements of different AC power supply systems is an urgent problem to be solved. Utility Model Content
[0004] This utility model provides a leakage current protection device and power supply system to better adapt to the leakage current protection needs of different AC power supply systems.
[0005] In a first aspect, this utility model provides a leakage current protection device applied to a power supply line, the power supply line including multiple power supply lines connected between the power grid and the load, the multiple power supply lines being used to transmit power, and the leakage current protection device comprising:
[0006] The detection circuit is electrically connected to the power supply line and is used to detect leakage current in the power supply line and generate a first leakage current detection signal; the first leakage current detection signal indicates whether the power supply line is leaking current.
[0007] A switching circuit includes at least one switching module and a circuit breaker module. Each switching module is electrically connected to a power supply line in a power supply line, and the circuit breaker module is disposed on the power supply line. The switching circuit is used to connect or disconnect multiple power supply lines through at least one switching module and the circuit breaker module.
[0008] A control circuit, electrically connected to a detection circuit and at least one switching module, is used to control at least one switching module to disconnect some or all of the multiple power supply lines when a first leakage current detection signal is received, so that the power supply line where leakage current occurs is disconnected.
[0009] Secondly, this utility model embodiment provides a power supply system, the power supply system comprising:
[0010] A three-phase four-wire power supply line connecting the power grid and the load;
[0011] And, as described in the first aspect, a residual current device; the circuit breaker module in the residual current device is installed on the four power supply lines of the power supply line.
[0012] The beneficial effects of this utility model are as follows:
[0013] In the leakage current protection device provided in this embodiment, the detection circuit in the leakage current protection device can detect leakage current in the power supply line and generate a first leakage current detection signal indicating that at least one power supply line in the power supply line has a leakage current. Furthermore, when the control circuit in the leakage current protection device receives the first leakage current detection signal, it can control at least one switching module in the switching circuit including the leakage current protection module to disconnect part or all of the power supply lines in the power supply line. This approach replaces the method of integrating a leakage current protection module for AC power supply systems onto the circuit breaker, and can better adapt to the leakage current protection needs of different AC power supply systems.
[0014] Furthermore, other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described herein are used to provide a further understanding of this utility model, constitute a part of this utility model, and do not constitute an improper limitation of this utility model. In the accompanying drawings:
[0016] Figure 1 This is a schematic diagram of the composition structure of a leakage current protection device provided in an embodiment of the present utility model.
[0017] Figure 2 A schematic diagram of the composition structure of another leakage protection device provided in an embodiment of this utility model.
[0018] Figure 3 A schematic diagram illustrating the composition of another leakage current protection device provided in this embodiment of the utility model.
[0019] Figure 4 A schematic diagram of the composition structure of another leakage protection device provided in this embodiment of the present utility model.
[0020] Figure 5 A schematic diagram of the composition structure of another leakage protection device provided for an embodiment of this utility model.
[0021] Figure 6 This is a schematic diagram of an optional power supply system provided for an embodiment of the present utility model.
[0022] Figure 7 This is a schematic diagram illustrating an application scenario of a leakage current protection device provided in an embodiment of this utility model.
[0023] Figure 8 This is a schematic diagram illustrating another application scenario of a leakage current protection device provided in this utility model embodiment.
[0024] Reference numerals in the attached diagram: 1-Leakage protection device; 11-Detection circuit; 12-Switching circuit; 121-1~121-n-Switching module; 121-1~121-m-Switching module; 13-Control circuit; 122-Circuit breaker module; 1221-Leakage detection module; 1222-Leakage protection module; 131-Configuration module; 132-Control module; 133-Communication module; 134-Input module; 14-Enable circuit; 141-Power supply module; 142-Conversion module; 143-Generation module; 2-Power supply line; 2-1~2-n-Power supply line; 2-1~2-m-Power supply line; 3-Grid connection device; 4-Load connection device. Detailed Implementation
[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0026] To enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the embodiments of this utility model, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
[0027] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0028] In the description of the embodiments of this utility model, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this utility model is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner. Furthermore, "multiple" in the embodiments of this utility model refers to two or more; therefore, "multiple" can also be understood as "at least two" in the embodiments of this utility model. "At least one" can be understood as one or more, for example, one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it can include A, B, C, A and B, A and C, B and C, or A and B and C.
[0029] It should be noted that in this embodiment of the invention, "and / or" describes the relationship between the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following associated objects have an "or" relationship. It should be pointed out that in this embodiment of the invention, "connection" can be understood as an electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.
[0030] Furthermore, the names of the messages or information exchanged between the multiple devices in the embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of these messages or information.
[0031] The design concept of this utility model embodiment is briefly introduced below:
[0032] Existing leakage current protection schemes for AC power supply systems integrate the leakage protection module into the circuit breaker. When a leakage occurs, the circuit breaker is tripped. For example, depending on the different power grid systems, there may be 3P, 3P+N, or 4P leakage protection schemes. However, no single leakage protection scheme is compatible with all AC power supply systems.
[0033] In other words, because the residual current protection (RCD) modules integrated into circuit breakers are designed for different AC power grids, it is difficult for a single RCD module to adapt to the RCD protection requirements of different AC power systems. Therefore, how to better adapt to the RCD protection requirements of different AC power systems is an urgent problem to be solved.
[0034] In view of this, in order to solve or improve the above-mentioned problems, this utility model provides a leakage current protection device. See also... Figure 1 As shown, the leakage current protection device 1 may include: a detection circuit 11, a switching circuit 12, and a control circuit 13. The switching circuit 12 may include: at least one switching module (i.e., Figure 1 The switch modules 121-1 to 121-n shown in (a) are or Figure 1 (b) shows switch modules 121-1 to 121-m and circuit breaker module 122. The detection circuit 11 is electrically connected to the power supply line 2, and each switch module is electrically connected to one power supply line in the power supply line 2, meaning there is a one-to-one correspondence between switch modules and power supply lines. Figure 1 As shown, the aforementioned at least one switch module is configured for some or all of the power supply lines in power supply line 11. Circuit breaker module 122 is mounted on power supply line 2. Control circuit 13 is electrically connected to detection circuit 11 and at least one switch module. The switch module can be an adapter or a disconnector, etc., and this embodiment of the invention does not limit this. Optionally, such as... Figure 1 As shown, power supply line 2 may include multiple power supply lines (i.e., power supply line 2-1 to power supply line 2-n) connected between the power grid and the load, and these multiple power supply lines are used to transmit power. In other words, power supply line 2 includes all the power supply lines required for the current power supply. For example, the aforementioned multiple power supply lines may include at least one live wire (or phase wire) and a neutral wire (or neutral line), or may also include a ground wire (or protective wire), which is not limited in this embodiment of the present invention.
[0035] The detection circuit 11 can be used to detect leakage current in the power supply line 2 and generate a first leakage current detection signal. The first leakage current detection signal can indicate that at least one power supply line included in the power supply line 2 has a leakage current. At least one power supply line is either some or all of the multiple power supply lines (i.e., power supply lines 2-1 to 2-n). For example, at least one power supply line can be... Figure 1 The power supply lines 2-1 to 2-n shown are, or are Figure 1 The power supply lines 2-1 to 2-m are shown. Optionally, the detection circuit 11 can generate a first leakage detection signal that only indicates the presence of leakage in the power supply line 2, thereby reducing the signaling overhead and resources required to generate and transmit the first leakage detection signal, and improving the efficiency of the control circuit 13 in providing leakage protection for the power supply line 11.
[0036] For example, the detection circuit 11 can perform leakage current detection on the power supply line 2 in real time, or it can perform leakage current detection on the power supply line 2 according to a set detection cycle (e.g., 30 seconds) to obtain a first leakage current detection signal. It should be understood that the detection circuit 11 may include any detection module with leakage current detection capability.
[0037] The switching circuit 12 can be used to connect or disconnect multiple power supply lines in the power supply line 2 via at least one switching module and circuit breaker module 122. Thus, by using the circuit breaker module 122 and at least one switching module, multiple power supply lines in the power supply line 2 can be disconnected when a leaking power supply line exists, ensuring the safety of the power supply line 2.
[0038] The control circuit 13 can be used to control at least one switching module included in the switching circuit 12 to disconnect some or all of the power supply lines among the multiple power supply lines when a first leakage current detection signal is received, so that the power supply line where leakage current occurs is disconnected. For example, when the control circuit 13 receives the first leakage current detection signal, it can generate a control signal for controlling at least one switching module to disconnect some or all of the power supply lines among the multiple power supply lines.
[0039] based on Figure 1 The leakage current protection module shown, through the detection circuit 11 in the leakage current protection device 1, can detect leakage current in the power supply line 2 and generate a first leakage current detection signal indicating that at least one power supply line in the power supply line 2 has a leakage current. Furthermore, when the control circuit 13 in the leakage current protection device 1 receives the first leakage current detection signal, it can control at least one switching module in the switching circuit 12, including the leakage current module 122, to disconnect some or all of the power supply lines in the power supply line 2. This approach replaces the method of integrating a leakage current protection module for AC power supply systems onto a circuit breaker in related technologies, and can better adapt to the leakage current protection needs of different AC power supply systems.
[0040] In one alternative implementation, see [link to relevant documentation]. Figure 2 As shown, the detection circuit 11 may include a current detection module 111 and a current comparison module 112. The current detection module 111 is electrically connected to the power supply line 2 and the current comparison module 112, respectively, and the current comparison module is electrically connected to the current detection module 111 and the control circuit 13, respectively.
[0041] The current detection module 111 can be used to detect the current value on the power supply line 2 and send the current value to the current comparison module 112. The current comparison module 112 can be used to compare the current value with a preset current threshold when it receives the current value, and output a first leakage current detection signal when the current value is greater than the current threshold.
[0042] If the switching circuit 12 is used to connect or disconnect multiple power supply lines in the power supply line 2, that is, to connect or disconnect all power supply lines in the power supply line 2, then the switching circuit 12 can control the switching circuit 12 to disconnect the power supply line corresponding to the power supply type according to the power supply type between the power grid and the load. For example, the aforementioned power supply type may include, but is not limited to: single-phase power supply, two-phase power supply, three-phase power supply, and split-phase power supply, and this embodiment of the present invention does not limit this.
[0043] In one alternative implementation, it is still as follows Figure 2 As shown, the control circuit 13 can also be electrically connected to the circuit breaker module 122. When at least one switch module is used to connect or disconnect all power supply lines (i.e., power supply line 2-1 to power supply line 2-n) among multiple power supply lines, the control circuit 13 may include a configuration module 131 and a control module 132. The control module 132 is electrically connected to the configuration module 131, at least one switch module, and the circuit breaker module 122.
[0044] The configuration module 131 can be used to configure the power supply type for the load according to the different connected loads, and send the power supply type to the control module 132, so that the control module 132 can turn on the circuit breaker module 122 and the switch module on the power supply line corresponding to the power supply type. The control module 132 can be used to control the switch module on the power supply line corresponding to the power supply type to turn off when it receives the first leakage current detection signal. In this way, leakage current protection for the power supply line 2 under different power supply types can be achieved by controlling only at least one switch module included in the switch circuit 12. For example, the control module 132 may include a microcontroller unit (MCU) or a central processing unit (CPU), which is not limited in this embodiment.
[0045] The aforementioned power supply types refer to the power supply system types used by the AC power grid to which the grid is connected. For example, the aforementioned power supply system types may include, but are not limited to: TT system, TN system, and IT system. In an IT system, the power supply neutral point is not grounded or is grounded through a high impedance. The metal casing of the electrical equipment (or electrical appliances) is directly grounded; that is, the neutral point of the power supply (or the power grid) is not grounded or is grounded through a high impedance, while the casing of the load equipment is directly grounded and has no electrical connection to the power supply. In a TT system, the power supply neutral point is directly grounded, and the exposed conductive parts of the electrical appliances are also directly grounded; that is, the neutral point of the power supply is directly grounded, and the casing of the load equipment is grounded through an independent grounding electrode, separated from the power supply grounding. In a TN system, the power supply neutral point is directly grounded, and the metal casing of the electrical equipment is electrically connected to the neutral conductor N. TN systems can be divided into TN-C systems, TN-S systems, and TN-CS systems. In a TN-C system, the neutral conductor N and the protective earth conductor PE are combined into a single PEN conductor. In a TN-S system, the neutral conductor N and the protective earth conductor PE are strictly separated. In a TN-CS system, the first half is the PEN line, and the second half is separated into the neutral line N and the protective line PE.
[0046] In one alternative implementation, it is still as follows Figure 2 As shown, the control circuit 13 may further include a communication module 133 and an input module 134. The communication module 133 is communicatively connected to the configuration module 131. The input module 134 is electrically connected to the configuration module 131. The communication module 133 can receive externally transmitted indication signals and send these signals to the configuration module 131. In this case, the configuration module 131 can also configure the power supply type for the load based on the indication signals. The input module 134 can receive externally input DIP switch signals and send these signals to the configuration module 131. In this case, the configuration module 131 can also configure the power supply type for the load based on the DIP switch signals. Optionally, the aforementioned indication signals and DIP switch signals can be 0 / 1 encoded control signals.
[0047] It should be noted that the aforementioned externally transmitted indication signal can be an indication signal sent by the user to the communication module 133 via wireless communication through an external device (e.g., a terminal device), and the aforementioned externally input DIP switch signal can be a DIP switch signal input by the user to the input module 134 through an external device (e.g., a DIP switch).
[0048] Based on the above method, after receiving the indication signal from the communication module 133 or the DIP switch signal from the input module 134, the configuration module 131 can configure the power supply type indicated by the indication signal or the power supply type indicated by the DIP switch signal for the connected load, thereby adopting the leakage protection method corresponding to the power supply type to meet the leakage protection requirements of the power supply line 2 under different power supply types (i.e., different AC power supply systems).
[0049] It is understood that this embodiment of the invention does not specify the order in which the circuit breaker module 122 and at least one switch module are electrically connected to the power supply line 2. For example... Figure 1 As shown, at least one switch module (i.e., switch module 121-1 to switch module 121-n or switch module 121-1 to switch module 121-m) can be electrically connected to the power supply line 2 and close to the power grid, and the circuit breaker module 122 can be electrically connected to the power supply line 2 and close to the load.
[0050] For example, at least one switch module can also be electrically connected to the power supply line 2 and close to the load, and the circuit breaker module 122 can also be electrically connected to the power supply line 2 and close to the power grid. This embodiment of the present invention does not limit this.
[0051] Furthermore, the circuit breaker module 122 can also be used to disconnect the first power supply line when an overload or short circuit is detected in the first power supply line of the power supply line 2 (or multiple power supply lines). In this way, the circuit breaker module 122 provides power outage protection for the power supply line 2 when an overload or short circuit occurs, further improving the safety of the power supply system.
[0052] Since the circuit breaker module 122 typically integrates a leakage protection module that provides leakage protection for a specific power supply system, if the specific power supply system corresponding to the leakage protection module integrated in the circuit breaker module 122 is the same as the AC power supply system required by the connected load, that is, if the power supply type corresponding to the leakage protection module integrated in the circuit breaker module 122 is the same as the power supply type required by the load, then partial or complete leakage protection can be achieved through the circuit breaker module 122, reducing the load on the control circuit 13. At this time, at least one switch module is used to connect or disconnect some power supply lines in the power supply line 2, that is, the switch circuit 12 is used to connect or disconnect the power supply lines corresponding to the power supply type that cannot be disconnected by leakage protection through the circuit breaker module 122.
[0053] In one alternative implementation, see [link to relevant documentation]. Figure 3As shown, the circuit breaker module 122 may include a leakage detection unit 1221 and a leakage protection unit 1222. The leakage detection unit 1221 is electrically connected to the power supply line 2, and the leakage protection unit 1222 is electrically connected to the leakage detection unit 1221 and the second power supply line (e.g., power supply line 2-1 to power supply line 2-m) among multiple power supply lines (e.g., power supply line 2-1 to power supply line 2-n). The leakage detection unit 1221 can be used to detect leakage in the power supply line 2 and generate a second leakage detection signal when leakage occurs in the power supply line 2. The leakage protection module 1222 can be used to disconnect the second power supply line (i.e., power supply line 2-1 to power supply line 2-m) upon receiving the second leakage detection signal. At this time, the control circuit 13 can be used to control at least one switch module to disconnect the third power supply line (i.e., power supply line 2-m+1 to power supply line 2-n) among the multiple power supply lines. That is, the power supply lines that at least one switch module can connect or disconnect include the second power supply line but not the third power supply line.
[0054] In one alternative implementation, see [link to relevant documentation]. Figure 4 As shown, the leakage current protection device 1 may further include an enabling circuit 14. The input terminal of the enabling circuit 14 is connected to the fourth power supply line (e.g., power supply line 2-1) and the fifth power supply line (e.g., power supply line 2-n) among multiple power supply lines (e.g., power supply line 2-1 to power supply line 2-n), and the output terminal of the enabling circuit 14 is electrically connected to the control circuit 13. The enabling circuit 14 can be used to receive a first electrical signal from the fourth power supply line and a second electrical signal from the fifth power supply line, and generate an enabling signal for the control circuit 13 based on the first and second electrical signals. For example, assuming the first electrical signal is a first voltage, it can be represented as V1, and the second electrical signal is a second voltage, it can be represented as V2. Then, the enabling signal can be the voltage difference obtained from the first voltage and the second electrical signal, and can be represented as V... EN =|V1-V2|.
[0055] In one alternative implementation, see [link to relevant documentation]. Figure 5 As shown, the enabling circuit 14 may include a power-taking module 141, a conversion module 142, and a generation module 143. The input terminal of the power-taking module 141 is connected to the fourth and fifth power supply lines. The input terminal of the conversion module 142 is electrically connected to the output terminal of the power-taking module 141, and the output terminal of the conversion module 142 is electrically connected to the input terminal of the generation module 143. The power-taking module 141 can be used to generate an AC signal based on a first electrical signal and a second electrical signal. The conversion module 142 can be used to perform AC-DC conversion on the AC signal to generate a DC signal. The generation module 143 can be used to generate an enable signal for the enabling control circuit 13 based on the DC signal. This eliminates the need for an additional auxiliary power supply for the enabling control circuit 13, reducing the circuit complexity of the leakage current protection device 1.
[0056] In summary, the leakage current protection device provided in this embodiment of the present invention can detect leakage current in the power supply line through the detection circuit and generate a first leakage current detection signal indicating that at least one power supply line in the power supply line has a leakage current. Furthermore, when the control circuit in the leakage current protection device receives the first leakage current detection signal, it can control at least one switching module in the switching circuit including the leakage current module to disconnect part or all of the power supply lines in the power supply line. This approach replaces the method of integrating a leakage current protection module for AC power supply systems onto the circuit breaker, and can better adapt to the leakage current protection needs of different AC power supply systems.
[0057] This utility model provides a power supply system. (See attached document.) Figure 6 As shown, the power supply system may include: Figure 1-5 The diagram shows a residual current device (RCD) 1, a power supply line 2, a power grid connection device 3, and a load connection device 4. The RCD 1 is electrically connected to the power supply line 2. The power grid connection device 3 is electrically connected to one end of the power supply line 2 in the RCD 1, and the power output device 4 is electrically connected to the other end of the power supply line 2. The power grid connection device 2 can be used to connect to power grids corresponding to different power supply types, and the load connection device 3 can be used to connect loads of different power supply types.
[0058] In one alternative implementation, the power supply line 2 can be a three-phase four-wire power supply line connecting the power grid and the load, and the circuit breaker module 122 in the leakage protection device 1 is installed on the four power supply lines of the power supply line 2.
[0059] Optionally, the power supply line 2 may include: a first phase line, a second phase line, a third phase line, and a neutral line. The switching module in the residual current device 1 includes a relay installed on the neutral line. See, for example, [reference needed]. Figure 7 As shown, taking a three-phase four-wire TT system as an example, the first phase line, second phase line, third phase line, and neutral line are, in order: phase line R, phase line S, phase line T, and neutral line N. If the circuit breaker module 122 has a 3P+N leakage protection capability, that is, when the circuit breaker module 122 detects leakage in the TT system (i.e., phase line R, phase line S, phase line T, and neutral line N), it can disconnect phase line R, phase line S, and phase line T to achieve leakage protection for phase line R, phase line S, and phase line T. At this time, through the first leakage detection signal of the detection circuit 11, the control circuit 13 can instruct the relay A set on the neutral line N to open, thereby achieving leakage protection for the neutral line N. It can be seen that leakage protection for the three-phase four-wire power supply line is achieved through the circuit breaker module 122 and the relay A.
[0060] Optionally, each switching module in the residual current device 1 includes a relay installed on the corresponding power supply line. Referring again to the aforementioned TT system as an example... Figure 8 As shown, if the circuit breaker module 132 does not have 3P+N leakage protection capability, when the detection circuit 11 detects leakage in the TT system (i.e., phase lines R, S, T, and neutral line N), the control circuit 13 can, based on the first leakage detection signal from the detection circuit 11, instruct the relays (i.e., B, C, D, and E) installed on phase lines R, S, T, and N to disconnect, thereby achieving leakage protection for phase lines R, S, T, and N. At this time, the relays (i.e., B, C, D, and E) installed on phase lines R, S, T, and N disconnect. Therefore, the leakage protection device 1, by controlling relays B, C, D, and E through the detection circuit 11 and the control circuit 13, can adapt to the leakage protection requirements of different AC power supply systems, i.e., it is not necessary to set different leakage protection modules for different AC power supply systems.
[0061] It is understandable that power supply line 2 may include more or fewer power supply lines. Taking a three-phase five-wire TN-S system as an example, the five power supply lines included in power supply line 2 can be, in order: the first phase line, the second phase line, the third phase line, the neutral line, and the protective conductor.
[0062] Furthermore, it should be understood that the above-disclosed embodiments are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution described in the present utility model shall still fall within the scope of the present utility model.
Claims
1. An electric leakage protection device, characterized by, The device is applied to power supply lines, which include multiple power supply lines connecting the power grid and the load, wherein the multiple power supply lines are used to transmit power. The leakage current protection device includes: A detection circuit is electrically connected to the power supply line. The detection circuit is used to detect leakage current in the power supply line and generate a first leakage current detection signal. The first leakage current detection signal indicates that leakage current has occurred on at least one of the power supply lines. A switching circuit includes at least one switching module and a circuit breaker module. Each switching module is electrically connected to one power supply line in the power supply line. The circuit breaker module is disposed on the power supply line. The switching circuit is used to connect or disconnect multiple power supply lines through at least one switching module and the circuit breaker module. A control circuit, electrically connected to the detection circuit and at least one of the switching modules, is configured to, upon receiving the first leakage current detection signal, control at least one of the switching modules to disconnect some or all of the power supply lines among the plurality of power supply lines, so that the power supply line where leakage current occurs is disconnected.
2. The ground fault protection device of claim 1, wherein, The control circuit is also electrically connected to the circuit breaker module. When at least one of the switching modules is used to connect or disconnect all of the power supply lines among the multiple power supply lines, the control circuit includes: a configuration module and a control module; wherein... The configuration module is used to configure the power supply type for the load according to the different connected loads, and send the power supply type to the control module so that the control module can conduct the circuit breaker module and the switch module on the power supply line corresponding to the power supply type according to the power supply type; The control module is electrically connected to the configuration module, at least one of the switch modules and the circuit breaker module. The control module is used to control the switch module on the power supply line corresponding to the power supply type to disconnect when it receives the first leakage current detection signal. The power supply type includes: single-phase power supply, two-phase power supply, three-phase power supply and split-phase power supply.
3. The leakage current protection device as described in claim 2, characterized in that, The control circuit further includes: a communication module and an input module; wherein... The communication module is communicatively connected to the configuration module. The communication module is used to receive an indication signal sent from an external source and send the indication signal to the configuration module. The configuration module is also used to configure the power supply type for the load based on the indication signal. The input module is electrically connected to the configuration module. The input module is used to receive externally input DIP switch signals and send the DIP switch signals to the configuration module. The configuration module is also used to configure the power supply type for the load based on the DIP switch signals.
4. The leakage current protection device as described in any one of claims 1-3, characterized in that, The circuit breaker module is also used to disconnect the first power supply line when an overload or short circuit is detected in the first power supply line among the multiple power supply lines.
5. The leakage current protection device as described in claim 4, characterized in that, The circuit breaker module further includes a leakage detection unit and a leakage protection unit, wherein at least one of the switch modules is used to disconnect a portion of the power supply lines among the plurality of power supply lines; The leakage detection unit is electrically connected to the power supply line. The leakage detection unit is used to detect leakage in the power supply line and generate a second leakage detection signal when leakage occurs in the power supply line. The leakage protection unit is electrically connected to the leakage detection module and the second power supply line among the multiple power supply lines. The leakage protection unit is used to disconnect the second power supply line when it receives the second leakage detection signal. The control circuit is used to control at least one of the switching modules to disconnect the third power supply line among the plurality of power supply lines; wherein, some of the power supply lines include the second power supply line but do not include the third power supply line.
6. The leakage current protection device as described in any one of claims 1-3, characterized in that, The leakage current protection device further includes: an enabling circuit; wherein... The input terminal of the enabling circuit is connected to the fourth and fifth power supply lines among the multiple power supply lines, and the output terminal of the enabling circuit is electrically connected to the control circuit. The enabling circuit is used to generate an enabling signal for the control circuit based on the first electrical signal of the fourth power supply line and the second electrical signal of the fifth power supply line.
7. The leakage current protection device as described in claim 6, characterized in that, The enabling circuit includes: A power-gathering module, the input terminal of which is electrically connected to the fourth power supply line and the fifth power supply line, the power-gathering module being used to generate an AC signal based on the first electrical signal and the second electrical signal; A conversion module, the input terminal of which is electrically connected to the output terminal of the power supply module, is used to convert the AC signal to DC signal to generate a DC signal; A generation module, the input terminal of which is electrically connected to the output terminal of the conversion module, is used to generate the enable signal based on the DC signal.
8. The leakage current protection device as described in claim 1, characterized in that, The detection circuit includes: a current detection module and a comparison module; wherein... The current detection module is electrically connected to the power supply line and the current comparison module respectively. The current detection module is used to detect the current value on the power supply line and send the current value to the current comparison module. The current comparison module is used to compare the received current value with a preset current threshold, and output the first leakage current detection signal when the current value is greater than the current threshold.
9. A power supply system, characterized in that, include: A three-phase four-wire power supply line connecting the power grid and the load; And, the leakage current protection device as described in any one of claims 1-8; The circuit breaker module in the leakage current protection device is installed on the four power supply lines of the power supply line.
10. The power supply system as described in claim 9, characterized in that, Each switching module in the leakage current protection device includes a relay installed on the corresponding power supply line.
11. The power supply system as described in claim 9, characterized in that, The power supply line includes: a first phase line, a second phase line, a third phase line, and a neutral line; The switching module in the leakage current protection device includes a relay installed on the neutral line.