Three-phase electric energy acquisition circuit, three-phase electric energy acquisition device and circuit breaker
By designing three-phase power acquisition circuits and bridge modules, the problem of poor universality of existing equipment is solved, multi-type grid adaptation and accurate current information acquisition are realized, and the current detection scale is simplified.
Patent Information
- Application Number
- CN202510268031.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-07-11
AI Technical Summary
The existing distribution network sampling equipment is costly, large in size and poor in versatility, and cannot be adapted to a variety of different types of primary-side hardware of the power grid.
A three-phase electric energy acquisition circuit is designed, including a collection module and a bridge module. The acquisition module is equipped with a three-phase current and zero-sequence current acquisition terminal. The bridge module is used to control the on or off of the three-phase current acquisition terminal and the zero-sequence current acquisition terminal to achieve accurate collection of current information and simplify the current detection scale.
It improves the versatility of the acquisition circuit, can be adapted to a variety of different types of primary-side equipment of the grid, improves the accuracy of current information and zero-sequence current, and reduces the use of current sampling components.
Smart Images
Figure CN120294407A_ABST
Abstract
Description
Technical Field
[0001] This application relates to, but is not limited to, the technical field of three-phase power acquisition circuits, and particularly relates to a three-phase power acquisition circuit, device, and circuit breaker. Background Art
[0002] In recent years, 10kV distribution network sampling equipment has been developing towards high precision, miniaturization, low power consumption, and standardized design. To meet the increasingly developing distribution network requirements, different primary-side hardware is installed on different distribution networks to meet different sampling needs.
[0003] In related technologies, the distribution network sampling equipment provided on the market has a high cost, large volume, and fixed internal circuits. One set of equipment can only meet specific types of primary-side hardware, and its versatility is poor. Summary of the Invention
[0004] The following is an overview of the subject matter described in detail in this article. This overview is not intended to limit the scope of protection of the claims.
[0005] Embodiments of this application provide a three-phase power acquisition circuit, device, and circuit breaker, which can improve the versatility of the acquisition circuit and adapt to various different types of grid primary-side equipment.
[0006] To achieve the above object, a first aspect of an embodiment of this application provides a three-phase power acquisition circuit, including: an acquisition module, on which three-phase current acquisition terminals are provided, the three-phase current acquisition terminals are connected to three phase circuits of an external three-phase power supply, and the three-phase current acquisition terminals are used to respectively acquire current information of the three phase circuits; a zero-sequence current acquisition terminal is further provided on the acquisition module, the zero-sequence current acquisition terminal is simultaneously connected to the three phase circuits, and the zero-sequence current acquisition terminal is used to acquire the zero-sequence current of the external three-phase power supply; a plurality of power information output terminals are further provided on the acquisition module, the power information output terminals are used to be connected to a host computer, and the power information output terminals are used to output the current information and the zero-sequence current to the host computer; a bridging module, one end of the bridging module is connected to the three-phase current acquisition terminals, and the other end of the bridging module is connected to the zero-sequence current acquisition terminal, and the bridging module is used to control the connection or disconnection between the three-phase current acquisition terminals and the zero-sequence current acquisition terminal.
[0007] In some embodiments, the three-phase current acquisition terminals include an A-phase current input port, a B-phase current input port, and a C-phase current input port, and the A-phase current input port, the B-phase current input port, and the C-phase current input port are used to respectively obtain the current information from the three phase circuits.
[0008] In some embodiments, the electrical energy information output terminal includes an A-phase output port, a B-phase output port, and a C-phase output port. The A-phase output port, the B-phase output port, and the C-phase output port are respectively connected to the host computer. The A-phase output port is used to output the current information obtained from the A-phase current input port, the B-phase output port is used to output the current information obtained from the B-phase current input port, and the C-phase output port is used to output the current information obtained from the C-phase current input port.
[0009] In some embodiments, the three-phase current acquisition terminal further includes a three-phase acquisition grounding port. First current transformers are respectively arranged on the three phase circuits. The A-phase current input port, the B-phase current input port, and the C-phase current input port are respectively connected to one end of the first current transformer on their respective phase circuits, and the three-phase acquisition grounding port is simultaneously connected to the other ends of the respective first current transformers.
[0010] In some embodiments, the electrical energy information output terminal includes a three-phase common grounding port. The three-phase common grounding port is connected to the host computer, and the three-phase acquisition grounding port is connected to the three-phase common grounding port.
[0011] In some embodiments, the zero-sequence current acquisition terminal includes a zero-sequence current input port and a zero-sequence current grounding port. A zero-sequence current transformer is arranged on the phase circuit. The zero-sequence current input port is connected to one end of the zero-sequence current transformer, and the zero-sequence current grounding port is connected to the other end of the zero-sequence current transformer.
[0012] In some embodiments, the acquisition module is further provided with a three-phase voltage acquisition terminal. The three-phase voltage acquisition terminal includes an A-phase voltage input port, a B-phase voltage input port, and a C-phase voltage input port. The A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port are respectively used to be connected to the three phase circuits. The A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port are respectively used to obtain the voltage information on the three phase circuits, and the electrical energy information output terminal is used to output the voltage information to the host computer.
[0013] In some embodiments, the three-phase voltage acquisition terminal further includes a zero-sequence voltage acquisition port. The zero-sequence voltage acquisition port is simultaneously connected to the A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port through the bridging module. The bridging module is used to control the connection or disconnection between the zero-sequence voltage acquisition port and the A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port. The zero-sequence voltage acquisition port is used to obtain the zero-sequence voltage of the phase circuit.
[0014] To achieve the above object, a three-phase power acquisition device is proposed in the second aspect of the present application, which includes a host computer and the three-phase power acquisition circuit as described in the first aspect. The host computer is electrically connected to a bridging module, and the host computer is used to control the connection or disconnection of the bridging module.
[0015] To achieve the above object, a circuit breaker is proposed in the third aspect of the present application, and the three-phase power acquisition device as described in the second aspect is provided on the circuit breaker.
[0016] According to the solution provided by the embodiments of the present application, by providing a bridging module, which is used to connect the three-phase current acquisition terminal and the zero-sequence current acquisition terminal, and the bridging module controls the connection or disconnection between the three-phase current acquisition terminal and the zero-sequence current acquisition terminal. When the bridging module controls the disconnection between the three-phase current acquisition terminal and the zero-sequence current acquisition terminal, the three-phase current acquisition terminal and the zero-sequence current acquisition terminal collect current information through the current sampling elements respectively provided on the three-phase circuit. At this time, the current information obtained by the three-phase current acquisition terminal and the zero-sequence current obtained by the zero-sequence current acquisition terminal do not interfere with each other, thereby improving the accuracy of the current information and the zero-sequence current. When the bridging module controls the connection between the three-phase current acquisition terminal and the zero-sequence current acquisition terminal, the currents generated by the current sampling elements of the three phase circuits connected to the three-phase current acquisition terminal will be combined to the zero-sequence current acquisition terminal. At this time, the three-phase current acquisition terminal can still normally obtain the current information of each phase circuit, and the zero-sequence current acquisition terminal can obtain the zero-sequence current obtained by the confluence of the current sampling elements of the three phase circuits, thus reducing the use of current sampling elements and simplifying the current detection scale of the three-phase circuit.
[0017] Other features and advantages of the present application will be described in the following specification, and some of them will become obvious from the specification, or be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification. They are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.
[0019] Figure 1 It is an optional circuit schematic diagram of the three-phase power acquisition circuit provided by the embodiments of the present application; Figure 2 It is an optional circuit schematic diagram of the three-phase power acquisition circuit when the bridging module is connected; Figure 3An optional circuit schematic diagram of the three-phase power acquisition circuit when the bridging module provided by the embodiment of the present application is disconnected; Figure 4 An optional system block diagram of the three-phase power acquisition device provided by the embodiment of the present application. Specific embodiments
[0020] This part will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present application. However, it should not be construed as a limitation on the protection scope of the present application.
[0021] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present application.
[0022] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.
[0023] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, and electrical connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.
[0024] Currently, the distribution network sampling devices provided on the market are costly, large in volume, and the internal circuits are fixed. One set of devices can only meet specific types of primary-side hardware, and their versatility is poor.
[0025] To address the problem of poor versatility of sampling devices, this application provides a three-phase power acquisition circuit, device, and circuit breaker. The three-phase power acquisition circuit includes: a collection module, on which three-phase current collection terminals are provided. The three-phase current collection terminals are connected to the three-phase circuits of an external three-phase power supply. The three-phase current collection terminals are used to respectively collect the current information of the three-phase circuits; a zero-sequence current collection terminal is also provided on the collection module. The zero-sequence current collection terminal is simultaneously connected to the three-phase circuits. The zero-sequence current collection terminal is used to collect the zero-sequence current of the external three-phase power supply; a plurality of power information output terminals are also provided on the collection module. The power information output terminals are used to connect to a host computer. The power information output terminals are used to output the current information and zero-sequence current to the host computer; a bridging module, one end of the bridging module is connected to the three-phase current collection terminal, and the other end of the bridging module is connected to the zero-sequence current collection terminal. The bridging module is used to control the connection or disconnection between the three-phase current collection terminal and the zero-sequence current collection terminal. According to the solution provided by the embodiments of this application, the versatility of the acquisition circuit can be improved to adapt to various types of primary-side equipment of the power grid.
[0026] The three-phase power acquisition circuit, device, and circuit breaker provided by the embodiments of this application are specifically described through the following embodiments. First, the three-phase power acquisition circuit in the embodiments of this application is described.
[0027] The following further elaborates on the embodiments of this application in conjunction with the accompanying drawings.
[0028] Refer to Figures 1 to 3 , an embodiment of this application provides a three-phase power acquisition circuit, including: A collection module 100, on which three-phase current collection terminals are provided. The three-phase current collection terminals are connected to the three-phase circuits of an external three-phase power supply 200. The three-phase current collection terminals are used to respectively collect the current information of the three-phase circuits; A zero-sequence current collection terminal is also provided on the collection module 100. The zero-sequence current collection terminal is simultaneously connected to the three-phase circuits. The zero-sequence current collection terminal is used to collect the zero-sequence current of the external three-phase power supply 200; A plurality of power information output terminals are also provided on the collection module 100. The power information output terminals are used to connect to a host computer 400. The power information output terminals are used to output the current information and zero-sequence current to the host computer 400; A bridging module 300, one end of the bridging module 300 is connected to the three-phase current collection terminal, and the other end of the bridging module 300 is connected to the zero-sequence current collection terminal. The bridging module 300 is used to control the connection or disconnection between the three-phase current collection terminal and the zero-sequence current collection terminal.
[0029] It can be understood that the power supply side and the load side of the external three-phase power supply 200 are connected through three phase circuits. The three-phase current acquisition ends are connected to the three phase circuits. Current sampling elements in the related art are arranged in the three phase circuits. The three-phase current acquisition ends respectively obtain the current information on the three phase circuits and transmit the current information to the host computer 400 through the electric energy information output end. The zero-sequence current acquisition end is simultaneously connected to the three phase circuits. The zero-sequence current acquisition end is used to obtain the zero-sequence current in the three phase circuits. When the three phase circuits are all normal, the zero-sequence current obtained by the zero-sequence current acquisition end is equal to zero. The three-phase electric energy acquisition circuit proposed in this application is provided with a bridging module 300. The bridging module 300 is used to connect the three-phase current acquisition end and the zero-sequence current acquisition end. The bridging module 300 controls the connection or disconnection between the three-phase current acquisition end and the zero-sequence current acquisition end. When the bridging module 300 controls the disconnection between the three-phase current acquisition end and the zero-sequence current acquisition end, the three-phase current acquisition end and the zero-sequence current acquisition end collect current information through the current sampling elements respectively arranged on the three phase circuits. At this time, the current information obtained by the three-phase current acquisition end and the zero-sequence current obtained by the zero-sequence current acquisition end do not interfere with each other, so as to improve the accuracy of the current information and the zero-sequence current. When the bridging module 300 controls the connection between the three-phase current acquisition end and the zero-sequence current acquisition end, the currents generated by the current sampling elements of the three phase circuits connected to the three-phase current acquisition end will be combined to the zero-sequence current acquisition end. At this time, the three-phase current acquisition end can still normally obtain the current information of each phase circuit, and the zero-sequence current acquisition end can obtain the zero-sequence current obtained by the combined current of the current sampling elements of the three phase circuits, thus reducing the use of current sampling elements and simplifying the current detection scale of the three phase circuits.
[0030] By setting the three-phase electric energy acquisition circuit proposed in this application, the staff can install a set of current sampling elements in the related art on the three phase circuits. One set includes three current sampling elements respectively arranged on the three phase circuits. The three-phase current acquisition end is connected to the current sampling elements and obtains the electric energy information of each phase circuit from the three phase circuits respectively. The bridging module 300 is used to control the connection between the zero-sequence current acquisition end and the three-phase current acquisition end, and the zero-sequence current acquisition end receives the zero-sequence current obtained by the combined current of the three current sampling elements.
[0031] The staff can also install two sets of current sampling components in the related art on the three-phase circuit. By controlling the bridging module 300, the three-phase current acquisition terminal and the zero-sequence current acquisition terminal are disconnected. The three-phase current acquisition terminal is connected to one set of current sampling components, and the zero-sequence current acquisition terminal is connected to the other set of current sampling components. The three-phase current acquisition terminal and the zero-sequence current acquisition terminal are independent of each other, so that it is possible to avoid the failure of the three-phase current acquisition terminal or the zero-sequence current acquisition terminal from affecting the other line and ensure the stable operation of the acquisition circuit. When the current sampling component on the line where the zero-sequence current acquisition terminal is located is damaged, the staff can connect the zero-sequence current acquisition terminal to the three-phase current acquisition terminal through the bridging module 300, so that the zero-sequence current acquisition terminal receives the zero-sequence current obtained by the confluence of the lines where the three-phase current acquisition terminal is located. Therefore, the function of the acquisition circuit to simultaneously obtain the current information and the zero-sequence current on the three-phase circuits can be restored without excessive maintenance of the acquisition circuit.
[0032] In addition, referring to Figures 1 to 3 As shown, in some embodiments of the present application, the three-phase current acquisition terminal includes an A-phase current input port 1AS1, a B-phase current input port 1BS1, and a C-phase current input port 1CS1. The A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 are used to obtain current information from the three-phase circuits respectively.
[0033] The three-phase circuits specifically include an A-phase circuit, a B-phase circuit, and a C-phase circuit. On the line where the three-phase current acquisition terminal is located, current sampling components in the related art are provided on the A-phase circuit, the B-phase circuit, and the C-phase circuit. The A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 are respectively connected to the current sampling components on the A-phase circuit, the B-phase circuit, and the C-phase circuit. The currents generated by the current sampling components on the A-phase circuit, the B-phase circuit, and the C-phase circuit flow into the acquisition module 100 through the A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 respectively.
[0034] In a specific embodiment, an analog-to-digital converter (not shown in the figure) is provided in the acquisition module 100. After the currents generated by the current sampling components on the A-phase circuit, the B-phase circuit, and the C-phase circuit flow into the acquisition module 100 through the A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 respectively, the analog-to-digital converter converts the currents input through the A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 into digital signals, and sends the digital signals representing the current magnitude information to the host computer 400 through the electric energy signal output terminal.
[0035] In another specific embodiment, the electrical energy information output end includes an A-phase output port 2AS1, a B-phase output port 2BS1, and a C-phase output port 2CS1. The A-phase output port 2AS1, the B-phase output port 2BS1, and the C-phase output port 2CS1 are respectively connected to the host computer 400. The A-phase output port 2AS1 is used to output the current information obtained from the A-phase current input port 1AS1, the B-phase output port 2BS1 is used to output the current information obtained from the B-phase current input port 1BS1, and the C-phase output port 2CS1 is used to output the current information obtained from the C-phase current input port 1CS1.
[0036] Inside the acquisition module 100, the A-phase output port 2AS1 is directly connected to the A-phase current input port 1AS1, the B-phase output port 2BS1 is directly connected to the B-phase current input port 1BS1, and the C-phase output port 2CS1 is directly connected to the C-phase current input port 1CS1. The current generated by the current sampling elements on the A-phase circuit, B-phase circuit, and C-phase circuit is directly transmitted to the host computer 400 through the transfer of the acquisition module 100. The analog-to-digital converter mentioned above is provided inside the host computer 400. The analog-to-digital converter converts the current output from the A-phase output port 2AS1, the B-phase output port 2BS1, and the C-phase output port 2CS1 into current information respectively, so as to monitor the three-phase circuits.
[0037] In addition, as Figure 1 shown, in an embodiment of the present application, first current transformers 110 are respectively arranged on the three-phase circuits. The three-phase current acquisition end further includes a three-phase acquisition grounding port. The A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 are respectively connected to one end of the first current transformer 110 on their respective phase circuits, and the three-phase acquisition grounding port is simultaneously connected to the other ends of the respective first current transformers 110.
[0038] As Figure 1 shown, the A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 are respectively connected to the same-name ends of the first current transformers 110 on their respective phase circuits. The three-phase acquisition grounding port includes a 1AS2 port, a 1BS2 port, and a 1CS2 port. The 1AS2 port, the 1BS2 port, and the 1CS2 port form a loop with the A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 simultaneously.
[0039] The electrical energy information output end further includes a three-phase universal grounding port, which is connected to the host computer 400. The three-phase universal grounding port corresponds to the A-phase output port 2AS1, the B-phase output port 2BS1, and the C-phase output port 2CS1. Inside the acquisition module 100, the three-phase acquisition grounding port is simultaneously connected to the 1AS2 port, the 1BS2 port, and the 1CS2 port.
[0040] In addition, referring to Figure 1 As shown, in some embodiments of the present application, the zero-sequence current acquisition end includes a zero-sequence current input port 3AS1 and a zero-sequence current grounding port 3AS2. A zero-sequence current transformer 120 is provided on the phase circuit. One end of the zero-sequence current input port 3AS1 is connected to the zero-sequence current transformer 120, and the other end of the zero-sequence current grounding port 3AS2 is connected to the zero-sequence current transformer 120.
[0041] The primary sides of the three phase circuits simultaneously pass through the zero-sequence current transformer 120, and a zero-sequence current is generated inside the zero-sequence current transformer 120. The zero-sequence current is equal to the vector sum of the induced currents generated by the three phase circuits. When the phase circuit is normal, the zero-sequence current flowing through the zero-sequence current input port 3AS1 is equal to zero.
[0042] The electrical energy signal output end further includes a zero-sequence current output port 4AS1 and a zero-sequence output grounding port 4AS2. The zero-sequence current output port 4AS1 is connected to the host computer 400 for outputting the zero-sequence current to the host computer 400. The zero-sequence output grounding port 4AS2 is connected to the host computer 400 for forming a loop with the zero-sequence output grounding port 4AS2. Inside the acquisition module 100, the zero-sequence output grounding port 4AS2 is directly connected to the zero-sequence current grounding port 3AS2.
[0043] In the electrical energy signal acquisition circuit proposed in the present application, a bridging module 300 is provided between the zero-sequence current input port 3AS1 and the three-phase acquisition grounding port. The bridging module 300 is used to control the connection or disconnection between the zero-sequence current input port 3AS1 and the three-phase acquisition grounding port.
[0044] Similar to the above embodiments, as Figure 2 shown, the staff can set a first current transformer 110 on the three phase circuits. By controlling the bridging module 300 to connect the zero-sequence current input port 3AS1 and the three-phase acquisition grounding port, the A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 respectively receive the induced currents generated by the first current transformer 110 on the three phase circuits, and the zero-sequence current input port 3AS1 receives the zero-sequence current after the combination of the induced currents on the three phase circuits.
[0045] As Figure 3As shown, the staff can also set the first current transformer 110 and the zero-sequence current transformer 120 on the phase circuit at the same time. By controlling the bridging module 300, the zero-sequence current input port 3AS1 is disconnected from the three-phase acquisition grounding port. The A-phase current input port 1AS1, the B-phase current input port 1BS1, and the C-phase current input port 1CS1 respectively receive the induced currents generated by the first current transformer 110 on the three phase circuits, while the zero-sequence current input port 3AS1 receives the zero-sequence current generated by the zero-sequence current transformer 120.
[0046] In addition, referring to Figure 1 As shown, in some embodiments of the present application, the acquisition module 100 is further provided with three-phase voltage acquisition terminals, which include an A-phase voltage input port UA1N, a B-phase voltage input port UB1N, and a C-phase voltage input port UC1N. The A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N are used to be respectively connected to the three phase circuits, and the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N are used to respectively obtain the voltage information on the three phase circuits. The electric energy information output terminal is used to output the voltage information to the host computer 400.
[0047] A voltage sampling module in the related art is provided on the three-phase circuit. The A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N are respectively connected to the voltage sampling modules on the corresponding three-phase circuits, so as to collect the voltage information on the corresponding three-phase circuits.
[0048] In a specific embodiment, an analog-to-digital converter is provided inside the acquisition module 100. The A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N are connected to the analog-to-digital converter. The fuzzy converter in the acquisition module 100 determines the voltage information including the voltage magnitude and frequency for the voltages at the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N, and outputs the voltage information to the host computer 400 through the electric energy information output terminal.
[0049] In another specific embodiment, the electric energy information output terminal includes an A-phase voltage output port, a B-phase voltage output port, and a C-phase voltage output port. Inside the acquisition module 100, the A-phase voltage output port is directly connected to the A-phase voltage input port UA1N, the B-phase voltage output port is directly connected to the B-phase voltage input port UB1N, and the C-phase voltage output port is directly connected to the C-phase voltage input port UC1N. An analog-to-digital converter is provided in the host computer 400, and the analog-to-digital converter in the host computer 400 determines the voltage information based on the voltages at the A-phase voltage output port, the B-phase voltage output port, and the C-phase voltage output port.
[0050] The three-phase voltage acquisition terminal further includes a zero-sequence voltage acquisition port U0. The zero-sequence voltage acquisition port U0 is connected to the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N through a bridging module 300. The bridging module 300 is used to control the connection or disconnection between the zero-sequence voltage acquisition port U0 and the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N. The zero-sequence voltage acquisition port U0 is used to obtain the zero-sequence voltage of the phase circuit.
[0051] Specifically, a zero-sequence voltage acquisition module 100 in the related art is provided on the three-phase circuit. The zero-sequence voltage acquisition port U0 is connected to the zero-sequence voltage acquisition module 100, so as to acquire the zero-sequence voltage on the three-phase circuit.
[0052] Similar to the above embodiment, the staff can only set the voltage acquisition module 100 on the three phase circuits respectively. The A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N are respectively connected to the voltage acquisition modules 100 on the corresponding phase circuits, so as to obtain the current information on the three phase circuits. At the same time, the staff controls the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N to be connected to the zero-sequence voltage acquisition port U0 simultaneously through the bridging module 300, so as to obtain the zero-sequence voltage of the phase circuit.
[0053] The staff can also set voltage acquisition modules 100 (not shown in the figure) on the three phase circuits respectively, connect the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N to the voltage acquisition modules 100 on the corresponding phase circuits respectively, and at the same time control the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N to be disconnected from the zero-sequence voltage acquisition port U0 through the bridging module 300, and set a separate zero-sequence voltage acquisition module 100 for the zero-sequence voltage acquisition port U0, so as to separate the lines for acquiring voltage information for the three phase circuits from the lines for acquiring zero-sequence voltage, ensuring that the two groups of lines do not interfere with each other. When the zero-sequence voltage acquisition module 100 is damaged, the staff can also control the A-phase voltage input port UA1N, the B-phase voltage input port UB1N, and the C-phase voltage input port UC1N to be connected to the zero-sequence voltage acquisition port U0 simultaneously through the bridging module 300, so as to resume the acquisition of zero-sequence voltage.
[0054] In addition, as Figure 1 and Figure 4As shown in the figure, an embodiment of the present application further provides a three-phase power acquisition device, which includes a host computer 400 and a three-phase power acquisition circuit as described in the above embodiment. The host computer 400 is electrically connected to the bridging module 300 in the three-phase power acquisition circuit, and the host computer 400 is used to control the connection or disconnection of the bridging module 300.
[0055] It can be understood that the specific implementation of this three-phase power acquisition device is basically the same as the specific embodiment of the above three-phase power acquisition circuit, and will not be elaborated here.
[0056] In addition, an embodiment of the present application further provides a circuit breaker, on which a three-phase power acquisition device as described in the above embodiment is provided.
[0057] It can be understood that the specific implementation of this circuit breaker is basically the same as the specific embodiment of the above three-phase power acquisition circuit, and will not be elaborated here.
[0058] The embodiments described in the embodiments of the present application are for more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
[0059] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0060] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices can be implemented as software, firmware, hardware and their appropriate combinations.
[0061] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0062] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Here, A and B can be singular or plural. The character " / " generally indicates an "or" relationship between the associated objects before and after. "At least one (item) of the following" or its similar expressions refer to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0063] In several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical or other forms.
[0064] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0065] In addition, in each embodiment of this application, each functional unit can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.
[0066] The preferred embodiments of the embodiments of this application have been described above with reference to the drawings, but this does not limit the scope of rights of the embodiments of this application. Any modifications, equivalent replacements, and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of this application shall be within the scope of rights of the embodiments of this application.
Claims
1. A three-phase electric energy acquisition circuit, characterized in that, Comprising: A collection module, on which three-phase current collection terminals are provided. The three-phase current collection terminals are connected to three-phase circuits of an external three-phase power supply, and the three-phase current collection terminals are used to respectively collect current information of the three-phase circuits; A zero-sequence current collection terminal is also provided on the collection module. The zero-sequence current collection terminal is simultaneously connected to the three-phase circuits, and the zero-sequence current collection terminal is used to collect the zero-sequence current of the external three-phase power supply; A plurality of power information output terminals are also provided on the collection module. The power information output terminals are used to be connected to a host computer, and the power information output terminals are used to output the current information and the zero-sequence current to the host computer; A bridging module, one end of the bridging module is connected to the three-phase current collection terminal, and the other end of the bridging module is connected to the zero-sequence current collection terminal. The bridging module is used to control the connection or disconnection between the three-phase current collection terminal and the zero-sequence current collection terminal.
2. The three-phase power acquisition circuit according to claim 1, wherein The three-phase current collection terminal includes an A-phase current input port, a B-phase current input port, and a C-phase current input port. The A-phase current input port, the B-phase current input port, and the C-phase current input port are used to respectively obtain the current information from the three-phase circuits.
3. The three-phase power acquisition circuit according to claim 2, wherein The power information output terminals include an A-phase output port, a B-phase output port, and a C-phase output port. The A-phase output port, the B-phase output port, and the C-phase output port are respectively connected to the host computer. The A-phase output port is used to output the current information obtained from the A-phase current input port, the B-phase output port is used to output the current information obtained from the B-phase current input port, and the C-phase output port is used to output the current information obtained from the C-phase current input port.
4. The three-phase electric energy acquisition circuit according to claim 2, wherein The three-phase current collection terminal further includes a three-phase collection grounding port. First current transformers are respectively provided on the three-phase circuits. The A-phase current input port, the B-phase current input port, and the C-phase current input port are respectively connected to one end of the first current transformer on their respective phase circuits, and the three-phase collection grounding port is simultaneously connected to the other ends of the respective first current transformers.
5. The three-phase power acquisition circuit according to claim 4, characterized in that, The power information output terminals include a three-phase common grounding port. The three-phase common grounding port is connected to the host computer, and the three-phase collection grounding port is connected to the three-phase common grounding port.
6. The three-phase power acquisition circuit according to claim 1, wherein The zero-sequence current collection terminal includes a zero-sequence current input port and a zero-sequence current grounding port. A zero-sequence current transformer is provided on the phase circuit. The zero-sequence current input port is connected to one end of the zero-sequence current transformer, and the zero-sequence current grounding port is connected to the other end of the zero-sequence current transformer.
7. The three-phase power acquisition circuit according to claim 1, wherein The acquisition module is further provided with three-phase voltage acquisition terminals, which include an A-phase voltage input port, a B-phase voltage input port, and a C-phase voltage input port. The A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port are used to be respectively connected to the three phase circuits, and are used to respectively obtain the voltage information on the three phase circuits. The electric energy information output terminal is used to output the voltage information to the host computer.
8. The three-phase power acquisition circuit according to claim 7, characterized in that The three-phase voltage acquisition terminals further include a zero-sequence voltage acquisition port, which is simultaneously connected to the A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port through the bridging module. The bridging module is used to control the connection or disconnection between the zero-sequence voltage acquisition port and the A-phase voltage input port, the B-phase voltage input port, and the C-phase voltage input port. The zero-sequence voltage acquisition port is used to obtain the zero-sequence voltage of the phase circuit.
9. A three-phase electric energy acquisition device, characterized in that, It includes a host computer and the three-phase electric energy acquisition circuit according to any one of claims 1 to 8. The host computer is electrically connected to the bridging module, and the host computer is used to control the connection or disconnection of the bridging module.
10. A circuit breaker, characterized in that, The circuit breaker is provided with the three-phase electric energy acquisition device according to claim 9.