Three-phase electric energy information acquisition device and circuit breaker

Abstract

The utility model discloses a three-phase electric energy information acquisition device and a breaker, comprising an acquisition module which is provided with a power supply voltage signal acquisition end, a load voltage signal acquisition end and a first zero sequence signal acquisition end, the power supply voltage signal acquisition end is connected with three phase circuits of a power supply side line, and the load voltage signal acquisition end is connected with the first zero sequence signal acquisition end; the load voltage signal acquisition end is connected with three phase circuits of the load side circuit; the first zero sequence signal acquisition end is respectively connected with the power supply voltage signal acquisition end and the load voltage signal acquisition end through the bridging module, and the bridging module is used for controlling connection or disconnection between the first zero sequence signal acquisition end and the power supply voltage signal acquisition end; the first zero sequence signal acquisition end and the load voltage signal acquisition end are connected or disconnected; the acquisition module is connected with the upper computer; according to the three-phase electric energy information acquisition device provided by the utility model, the application range of the device can be expanded on the premise of keeping lower cost and smaller volume.

Description

Technical Field

[0001] This utility model relates to the field of three-phase power acquisition circuit technology, and in particular to a three-phase power information acquisition device and circuit breaker. Background Technology

[0002] Existing power acquisition devices are expensive and bulky. When more detection functions are required, it is often necessary to add an equal number of primary and secondary detection devices to the power acquisition device, which increases the cost and size of the power acquisition device. Utility Model Content

[0003] The following is an overview of the subject matter described in detail herein, and this overview is not intended to limit the scope of the claims.

[0004] This utility model proposes a three-phase power information acquisition device and a circuit breaker, which can expand the application scope of the three-phase power information acquisition device while maintaining low cost and small size.

[0005] To achieve the above objectives, the first aspect of this utility model provides a three-phase power information acquisition device, comprising: an acquisition module, equipped with a power supply voltage signal acquisition terminal, a load voltage signal acquisition terminal, and a first zero-sequence signal acquisition terminal, wherein the power supply voltage signal acquisition terminal is connected to three phase circuits of a power supply side line, and is used to acquire voltage information of the power supply side line; the load voltage signal acquisition terminal is connected to the three phase circuits of a load side line, and is used to acquire voltage information of the load side line; and a bridging module, wherein the first zero-sequence signal acquisition terminal is connected to the bridging module respectively. The bridging module is connected to the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal. It controls the connection or disconnection between the first zero-sequence signal acquisition terminal and the power supply voltage signal acquisition terminal, and between the first zero-sequence signal acquisition terminal and the load voltage signal acquisition terminal. The first zero-sequence signal acquisition terminal acquires zero-sequence voltage from the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal. The acquisition module is connected to a host computer and outputs zero-sequence voltage, voltage information of the power supply side line, and voltage information of the load side line to the host computer.

[0006] In some embodiments, the power supply voltage signal acquisition terminal includes a first A-phase acquisition port, a first B-phase acquisition port, and a first C-phase acquisition port. The first A-phase acquisition port, the first B-phase acquisition port, and the first C-phase acquisition port are respectively connected to the first A-phase circuit, the first B-phase circuit, and the first C-phase circuit in the power supply side line. The first A-phase acquisition port is used to acquire the voltage information of the first A-phase circuit, the first B-phase acquisition port is used to acquire the voltage information of the first B-phase circuit, and the first C-phase acquisition port is used to acquire the voltage information of the first C-phase circuit.

[0007] In some embodiments, a first capacitor is provided between the first A-phase acquisition port and the first A-phase circuit, between the first B-phase acquisition port and the first B-phase circuit, and between the first C-phase acquisition port and the first C-phase circuit.

[0008] In some embodiments, the first A-phase acquisition port, the first B-phase acquisition port, and the first C-phase acquisition port are simultaneously connected to the first zero-sequence signal acquisition terminal through the bridging module. The first zero-sequence signal acquisition terminal is also grounded at one end of the second capacitor, and the other end of the second capacitor is grounded. The bridging module is used to simultaneously control the connection or disconnection between the first A-phase acquisition port, the first B-phase acquisition port, and the first C-phase acquisition port and the first zero-sequence signal acquisition terminal.

[0009] In some embodiments, the load voltage signal acquisition terminal includes a second A-phase acquisition port, a second B-phase acquisition port, and a second C-phase acquisition port. The second A-phase acquisition port, the second B-phase acquisition port, and the second C-phase acquisition port are respectively connected to the second A-phase circuit, the second B-phase circuit, and the second C-phase circuit in the load-side line. A third capacitor is provided between the second A-phase acquisition port and the second A-phase circuit, between the second B-phase acquisition port and the second B-phase circuit, and between the second C-phase acquisition port and the second C-phase circuit.

[0010] In some embodiments, the acquisition module is further provided with a current signal acquisition terminal, which is connected to the three phase circuits of the load-side line and is used to acquire the current information of the load-side line.

[0011] In some embodiments, the acquisition module is further provided with a second zero-sequence signal acquisition terminal, which is connected to the load-side line and is used to acquire the zero-sequence current of the load-side line.

[0012] To achieve the above objectives, a second aspect of this utility model provides a circuit breaker, including a circuit breaker module and a three-phase power acquisition device as described in the first aspect. One side of the circuit breaker module is connected to the power supply side line, and the other side of the circuit breaker module is connected to the load side line. The circuit breaker module is connected to the host computer of the three-phase power acquisition device, and the host computer controls the connection or disconnection between the power supply side line and the load side line through the circuit breaker module.

[0013] The embodiments of this application include at least the following beneficial effects: the power supply voltage signal acquisition terminal is connected to the three phase circuits of the power supply side line. The power supply voltage signal acquisition terminal can acquire the phase voltage of each phase circuit, thereby obtaining the voltage information of each phase circuit. Based on the definition of zero-sequence voltage, in a three-phase circuit, when the phase voltages on the three phase circuits are asymmetrical, the vector sum of each phase voltage is not zero, resulting in a non-zero zero-sequence voltage. By setting a first zero-sequence signal acquisition terminal and a bridging module, and connecting the first zero-sequence signal acquisition terminal to the power supply voltage signal acquisition terminal through the bridging module, when the bridging module controls the connection between the first zero-sequence signal acquisition terminal and the power supply voltage signal acquisition terminal, the phase voltages generated by the three phase circuits of the power supply side line are combined to the first zero-sequence signal acquisition terminal, thereby enabling the first zero-sequence signal acquisition terminal to obtain the zero-sequence voltage of the power supply side line. Similarly, by controlling the connection between the first zero-sequence signal acquisition terminal and the load voltage signal acquisition terminal through the bridging module, the phase voltages generated by the three phase circuits of the power supply side line are combined to the first zero-sequence signal acquisition terminal, thereby enabling the first zero-sequence signal acquisition terminal to obtain the zero-sequence voltage of the power supply side line. When the terminals are connected, the phase voltages generated by the three phase circuits of the load-side line can also be combined to the first zero-sequence signal acquisition terminal. When the connection between the first zero-sequence signal acquisition terminal and the power supply voltage signal acquisition terminal, and the connection between the first zero-sequence signal acquisition terminal and the load voltage signal acquisition terminal are controlled by the bridging module, the normality of the three-phase circuit can be determined by judging whether the zero-sequence voltage of the first zero-sequence signal acquisition terminal is equal to zero, thereby reducing the use of primary side equipment. In addition, the staff can also control the connection or disconnection between the first zero-sequence signal acquisition terminal and the power supply voltage signal acquisition terminal, or the connection or disconnection between the first zero-sequence signal acquisition terminal and the load voltage signal acquisition terminal, according to the specific situation, thereby meeting different needs and expanding the applicability of the three-phase power information acquisition device while maintaining low cost and small size, thus improving its practicality.

[0014] Other features and advantages of this invention will be set forth in the description which follows, 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 may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0016] Figure 1 A schematic diagram of an optional circuit for a three-phase power information acquisition device provided in an embodiment of this utility model;

[0017] Figure 2 Another optional circuit diagram of the three-phase power information acquisition device provided in this embodiment of the utility model;

[0018] Figure 3 Another optional circuit diagram of the three-phase power information acquisition device provided in this embodiment of the utility model;

[0019] Figure 4 An optional system block diagram of a three-phase power information acquisition device provided in an embodiment of this utility model. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. 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.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Currently, existing power acquisition devices are expensive and bulky. When more detection functions are required, it is often necessary to add an equal number of primary-side detection devices and secondary-side detection devices to the power acquisition device, which increases the cost and size of the power acquisition device accordingly.

[0025] To address the issue of increasing cost and size of power data acquisition devices due to the addition of functional and required primary and secondary side equipment, this invention provides a three-phase power information acquisition device and circuit breaker. The three-phase power information acquisition device includes: an acquisition module equipped with a power supply voltage signal acquisition terminal, a load voltage signal acquisition terminal, and a first zero-sequence signal acquisition terminal. The power supply voltage signal acquisition terminal is connected to the three phase circuits of the power supply line and is used to acquire voltage information from the power supply line. The load voltage signal acquisition terminal is connected to the three phase circuits of the load line and is used to acquire voltage information from the load line. A bridging module is used to bridge the first zero-sequence signal acquisition terminal. The module is connected to the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal respectively. The bridging module is used to control the connection or disconnection between the first zero-sequence signal acquisition terminal and the power supply voltage signal acquisition terminal, as well as between the first zero-sequence signal acquisition terminal and the load voltage signal acquisition terminal. The first zero-sequence signal acquisition terminal is used to acquire zero-sequence voltage from the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal. The acquisition module is connected to the host computer and outputs zero-sequence voltage, voltage information of the power supply side line, and voltage information of the load side line to the host computer. According to the solution provided by the embodiment of this utility model, the applicable scope of the three-phase power information acquisition device can be expanded while maintaining low cost and small size.

[0026] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0027] Reference Figure 1 and Figure 4 This utility model embodiment provides a three-phase power information acquisition device, including:

[0028] The acquisition module 100 is equipped with a power supply voltage signal acquisition terminal, a load voltage signal acquisition terminal and a first zero-sequence signal acquisition terminal U0. The power supply voltage signal acquisition terminal is connected to the three phase circuits of the power supply side line 210 and is used to acquire the voltage information of the power supply side line 210. The load voltage signal acquisition terminal is connected to the three phase circuits of the load side line 220 and is used to acquire the voltage information of the load side line 220.

[0029] The bridging module 300 connects the first zero-sequence signal acquisition terminal U0 to the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal respectively. The bridging module 300 is used to control the connection or disconnection between the first zero-sequence signal acquisition terminal U0 and the power supply voltage signal acquisition terminal, and between the first zero-sequence signal acquisition terminal U0 and the load voltage signal acquisition terminal. The first zero-sequence signal acquisition terminal U0 is used to acquire zero-sequence voltage from the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal.

[0030] The host computer 400 is connected to the acquisition module 100, which outputs zero-sequence voltage, voltage information of the power supply side line 210 and voltage information of the load side line 220 to the host computer 400.

[0031] Based on this, the power supply voltage signal acquisition terminal is connected to the three phase circuits of the power supply side line 210. The power supply voltage signal acquisition terminal can acquire the phase voltage of each phase circuit, thereby obtaining the voltage information of each phase circuit. Based on the definition of zero-sequence voltage, in a three-phase circuit, when the phase voltages on the three phase circuits are asymmetrical, the vector sum of the phase voltages is not zero, resulting in a non-zero zero-sequence voltage. By setting the first zero-sequence signal acquisition terminal U0 and the bridging module 300, and connecting the first zero-sequence signal acquisition terminal U0 to the power supply voltage signal acquisition terminal through the bridging module 300, when the bridging module 300 controls the connection between the first zero-sequence signal acquisition terminal U0 and the power supply voltage signal acquisition terminal, the phase voltages generated by the three phase circuits of the power supply side line 210 are combined to the first zero-sequence signal acquisition terminal U0, thereby enabling the first zero-sequence signal acquisition terminal U0 to obtain the zero-sequence voltage of the power supply side line 210. Similarly, the first zero-sequence signal acquisition terminal U0 can obtain the zero-sequence voltage of the power supply side line 210 through the bridging module 300. When the signal acquisition terminal U0 is connected to the load voltage signal acquisition terminal, the phase voltages generated by the three phase circuits of the load-side line 220 can also be combined to the first zero-sequence signal acquisition terminal U0. When the connection between the first zero-sequence signal acquisition terminal U0 and the power supply voltage signal acquisition terminal, and between the first zero-sequence signal acquisition terminal U0 and the load voltage signal acquisition terminal are controlled by the bridging module 300, it can be determined whether the three-phase circuit is normal by judging whether the zero-sequence voltage of the first zero-sequence signal acquisition terminal U0 is equal to zero, thereby reducing the use of primary side equipment. In addition, the staff can also control the connection or disconnection between the first zero-sequence signal acquisition terminal U0 and the power supply voltage signal acquisition terminal, or between the first zero-sequence signal acquisition terminal U0 and the load voltage signal acquisition terminal, through the bridging module 300 according to the specific situation, thereby meeting different needs, expanding the application scope of the three-phase power information acquisition device, and improving its practicality.

[0032] Additionally, refer to Figures 1 to 3As shown, in some embodiments of this utility model, the power supply voltage signal acquisition terminal includes a first A-phase acquisition port UA1N, a first B-phase acquisition port UB1N, and a first C-phase acquisition port UC1N. The first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N are respectively connected to the first A-phase circuit A1, the first B-phase circuit B1, and the first C-phase circuit C1 in the power supply side line 210. The first A-phase acquisition port UA1N is used to acquire the voltage information of the first A-phase circuit A1, the first B-phase acquisition port UB1N is used to acquire the voltage information of the first B-phase circuit B1, and the first C-phase acquisition port UC1N is used to acquire the voltage information of the first C-phase circuit C1.

[0033] The power supply voltage signal acquisition terminal is equipped with multiple voltage sampling modules from related technologies. The input side of the voltage sampling module is connected to the first A-phase circuit A1, the first B-phase circuit B1, and the first C-phase circuit C1, respectively. The output side of the voltage sampling module is connected to the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N, respectively. The first A-phase acquisition port UA1N acquires the phase induced voltage of the first A-phase circuit A1, the first B-phase acquisition port UB1N acquires the phase induced voltage of the first B-phase circuit B1, and the first C-phase acquisition port UC1N acquires the phase induced voltage of the first C-phase circuit C1.

[0034] In one specific implementation, the acquisition module 100 is equipped with an analog-to-digital converter. The acquisition module 100 acquires the phase induced voltages of the first A-phase circuit A1, the first B-phase circuit B1, and the first C-phase circuit C1 through the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N, respectively. It converts the phase induced voltages into digital signals to obtain voltage information and sends the voltage information to the host computer 400.

[0035] In another specific implementation, the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N are directly connected to the host computer 400 through the acquisition module 100. The host computer 400 is equipped with an analog-to-digital converter and a protection circuit. The analog-to-digital converter converts the phase-sensing voltage into a digital signal, which can also obtain voltage information.

[0036] In some embodiments, the voltage sampling module includes a plurality of first capacitors 211. One side of each first capacitor 211 is connected to a corresponding first A-phase circuit A1, first B-phase circuit B1, or first C-phase circuit C1. The other side of each first capacitor 211 is connected to a corresponding first A-phase acquisition port UA1N, first B-phase acquisition port UB1N, and first C-phase acquisition port UC1N. Each first A-phase circuit A1, first B-phase circuit B1, or first C-phase circuit C1 charges or discharges one side of its respective first capacitor 211, generating a voltage of the same magnitude but opposite polarity on the other side of the first capacitor 211. This voltage is then acquired through the corresponding first A-phase acquisition port UA1N, first B-phase acquisition port UB1N, and first C-phase acquisition port UC1N, thereby obtaining the voltage information of the first A-phase circuit A1, first B-phase circuit B1, or first C-phase circuit C1.

[0037] Additionally, refer to again Figures 1 to 3 As shown, in some embodiments of this utility model, the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N are simultaneously connected to the first zero-sequence signal acquisition terminal U0 through the bridging module 300. The first zero-sequence signal acquisition terminal U0 is also grounded to one end of the second capacitor 221, and the other end of the second capacitor 221 is grounded. The bridging module 300 is used to simultaneously control the connection or disconnection between the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N and the first zero-sequence signal acquisition terminal U0.

[0038] Understandably, when the bridging module 300 simultaneously connects the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N to the first zero-sequence signal acquisition terminal U0, the induced voltage generated by each of the first capacitors 211 near one side of the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N respectively is concentrated on one side of the second capacitor 221, generating a zero-sequence voltage. This side is also connected to the first zero-sequence signal acquisition terminal U0. The induced voltage concentrated by the second capacitor 221 is acquired by the first zero-sequence signal acquisition terminal U0. When the first zero-sequence signal acquisition terminal U0 identifies that the zero-sequence voltage is equal to zero, it indicates that all three phase circuits of the power supply side line 210 are normal.

[0039] In addition, the power supply voltage signal acquisition terminal also includes a first ground terminal GND. When the bridging module 300 simultaneously controls the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N to disconnect from the first zero-sequence signal acquisition terminal U0, the first ground terminal GND is simultaneously connected to the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N. The first ground terminal GND is used to provide grounding for the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N.

[0040] In addition, in some embodiments of this utility model, the load voltage signal acquisition terminal includes a second A-phase acquisition port UA2N, a second B-phase acquisition port UB2N, and a second C-phase acquisition port UC2N. The second A-phase acquisition port UA2N, the second B-phase acquisition port UB2N, and the second C-phase acquisition port UC2N are respectively connected to the second A-phase circuit A2, the second B-phase circuit B2, and the second C-phase circuit C2 in the load-side line 220. A third capacitor 110 is provided between the second A-phase acquisition port UA2N and the second A-phase circuit A2, between the second B-phase acquisition port UB2N and the second B-phase circuit B2, and between the second C-phase acquisition port UC2N and the second C-phase circuit C2.

[0041] Similarly, the second phase A circuit A2, the second phase B circuit B2, and the second phase C circuit C2 in the load-side line 220 are respectively connected to one side of their respective third capacitors 110, and a corresponding induced voltage will be generated on the other side of the third capacitors 110. The second phase A acquisition port UA2N, the second phase B acquisition port UB2N, and the second phase C acquisition port UC2N are respectively connected to the other side of their respective third capacitors 110, thereby acquiring the induced voltage of their respective third capacitors 110, which is then analyzed by the acquisition module 100 or the host computer 400 to obtain voltage information.

[0042] The second phase A acquisition port UA2N, the second phase B acquisition port UB2N, and the second phase C acquisition port UC2N are simultaneously connected to the first zero-sequence signal acquisition terminal U0 through the bridging module 300. The bridging module 300 is also used to simultaneously control the connection or disconnection between the second phase A acquisition port UA2N, the second phase B acquisition port UB2N, the second phase C acquisition port UC2N and the first zero-sequence signal acquisition terminal U0.

[0043] When the bridging module 300 simultaneously controls the connection between the second phase A acquisition port UA2N, the second phase B acquisition port UB2N, and the second phase C acquisition port UC2N and the first zero-sequence signal acquisition terminal U0, the induced voltage generated by each of the third capacitors 110 near one side of the second phase A acquisition port UA2N, the second phase B acquisition port UB2N, and the second phase C acquisition port UC2N is concentrated on one side of the second capacitor 221, generating a zero-sequence voltage. This side is simultaneously connected to the first zero-sequence signal acquisition terminal U0. The induced voltage concentrated by the second capacitor 221 is acquired by the first zero-sequence signal acquisition terminal U0. When the first zero-sequence signal acquisition terminal U0 identifies that the zero-sequence voltage is equal to zero, it indicates that all three phase circuits of the load-side line 220 are normal.

[0044] The load voltage signal acquisition terminal also includes a second ground terminal Un1. When the bridging module 300 simultaneously controls the second A-phase acquisition port UA2N, the second B-phase acquisition port UB2N, and the second C-phase acquisition port UC2N to disconnect from the first zero-sequence signal acquisition terminal U0, the second ground terminal Un1 is simultaneously connected to the second A-phase acquisition port UA2N, the second B-phase acquisition port UB2N, and the second C-phase acquisition port UC2N. The second ground terminal Un1 provides grounding for the second A-phase acquisition port UA2N, the second B-phase acquisition port UB2N, and the second C-phase acquisition port UC2N.

[0045] Therefore, when the bridging module 300 simultaneously connects the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N to the first zero-sequence signal acquisition terminal U0, and simultaneously connects the second A-phase acquisition port UA2N, the second B-phase acquisition port UB2N, and the second C-phase acquisition port UC2N to the first zero-sequence signal acquisition terminal U0, its actual circuit diagram is equivalent to Figure 2 One side of the second capacitor 221 will generate a zero-sequence voltage simultaneously induced by the power supply line 210 and the load line 220, thereby eliminating the need to install primary side equipment on both the power supply line 210 and the load line 220, reducing the installation of primary side equipment and lowering costs. When the first zero-sequence signal acquisition terminal U0 identifies a zero-sequence voltage that is not equal to zero, it indicates that there is a fault in the power supply line 210 or the load line 220, and the host computer 400 can notify the staff to troubleshoot the fault.

[0046] Conversely, when the bridging module 300 simultaneously connects the first A-phase acquisition port UA1N, the first B-phase acquisition port UB1N, and the first C-phase acquisition port UC1N to the first zero-sequence signal acquisition terminal U0, and disconnects the second A-phase acquisition port UA2N, the second B-phase acquisition port UB2N, and the second C-phase acquisition port UC2N from the first zero-sequence signal acquisition terminal U0, its circuit diagram is equivalent to Figure 3 .

[0047] In addition, in some embodiments of this application, the acquisition module 100 is also provided with a current signal acquisition terminal, which is connected to the three phase circuits of the load-side line 220. The current signal acquisition terminal is used to acquire the current information of the load-side line 220.

[0048] The current signal acquisition terminal includes an A-phase current acquisition port 1AS1, a B-phase current acquisition port 1BS1, and a C-phase current acquisition port 1CS1. The A-phase current acquisition port 1AS1, the B-phase current acquisition port 1BS1, and the C-phase current acquisition port 1CS1 are respectively connected to the second A-phase circuit A2, the second B-phase circuit B2, and the second C-phase circuit C2 of the load-side line 220 through current sampling elements in related technologies. The induced current obtained by the current sampling elements is acquired by the A-phase current acquisition port 1AS1, the B-phase current acquisition port 1BS1, and the C-phase current acquisition port 1CS1, and then analyzed by the acquisition module 100 or the host computer 400.

[0049] In some specific implementations, the acquisition module 100 may also be provided with a second zero-sequence signal acquisition terminal 2AS1, which is connected to the load-side line 220 and is used to acquire the zero-sequence current of the load-side line 220.

[0050] Current sampling elements are connected to the second phase A circuit A2, the second phase B circuit B2, and the second phase C circuit C2 of the load-side line 220. The second zero-sequence signal acquisition terminal 2AS1 is simultaneously connected to the current sampling elements of the second phase A circuit A2, the second phase B circuit B2, and the second phase C circuit C2. The second zero-sequence signal acquisition terminal 2AS1 simultaneously receives the induced current generated by the current sampling elements of the second phase A circuit A2, the second phase B circuit B2, and the second phase C circuit C2. When the induced current acquired by the second zero-sequence signal acquisition terminal 2AS1 is zero, it indicates that the load-side line 220 is normal.

[0051] It is understandable that by simultaneously setting a current signal acquisition terminal and a second zero-sequence signal acquisition terminal 2AS1 on the acquisition module 100, the application range of the three-phase power acquisition device can be expanded, while reducing the installation and use of primary and secondary side equipment and lowering the cost of use.

[0052] In addition, this utility model also proposes a circuit breaker, including a circuit breaker module and a three-phase power acquisition device as described in the above embodiment. One side of the circuit breaker module is connected to the power supply side line, and the other side of the circuit breaker module is connected to the load side line. The circuit breaker module is connected to the host computer of the three-phase power acquisition device, and the host computer controls the connection or disconnection between the power supply side line and the load side line through the circuit breaker module.

[0053] It is understandable that by installing the three-phase power acquisition device in the above embodiment in the circuit breaker and controlling the connection or disconnection of the bridging module, the three-phase power acquisition device can detect the power supply side line and the load side line respectively according to different usage requirements. The circuit breaker with the three-phase power acquisition device installed has a good range of applications and can reduce its design and assembly costs.

[0054] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A three-phase electrical energy information acquisition device, characterized in that, include: The acquisition module is equipped with a power supply voltage signal acquisition terminal, a load voltage signal acquisition terminal, and a first zero-sequence signal acquisition terminal. The power supply voltage signal acquisition terminal is connected to the three phase circuits of the power supply side line and is used to acquire the voltage information of the power supply side line. The load voltage signal acquisition terminal is connected to the three phase circuits of the load side line and is used to acquire the voltage information of the load side line. A bridging module is provided, wherein the first zero-sequence signal acquisition terminal is connected to the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal respectively through the bridging module. The bridging module is used to control the connection or disconnection between the first zero-sequence signal acquisition terminal and the power supply voltage signal acquisition terminal, and between the first zero-sequence signal acquisition terminal and the load voltage signal acquisition terminal. The first zero-sequence signal acquisition terminal is used to acquire zero-sequence voltage from the power supply voltage signal acquisition terminal and the load voltage signal acquisition terminal. The host computer is connected to the acquisition module, and the acquisition module outputs zero-sequence voltage, voltage information of the power supply side line, and voltage information of the load side line to the host computer.

2. The three-phase power information acquisition device according to claim 1, characterized in that, The power supply voltage signal acquisition terminal includes a first A-phase acquisition port, a first B-phase acquisition port, and a first C-phase acquisition port. The first A-phase acquisition port, the first B-phase acquisition port, and the first C-phase acquisition port are respectively connected to the first A-phase circuit, the first B-phase circuit, and the first C-phase circuit in the power supply side line. The first A-phase acquisition port is used to acquire the voltage information of the first A-phase circuit, the first B-phase acquisition port is used to acquire the voltage information of the first B-phase circuit, and the first C-phase acquisition port is used to acquire the voltage information of the first C-phase circuit.

3. The three-phase power information acquisition device according to claim 2, characterized in that, A first capacitor is provided between the first A-phase acquisition port and the first A-phase circuit, between the first B-phase acquisition port and the first B-phase circuit, and between the first C-phase acquisition port and the first C-phase circuit.

4. The three-phase power information acquisition device according to claim 2, characterized in that, The first phase A acquisition port, the first phase B acquisition port, and the first phase C acquisition port are simultaneously connected to the first zero-sequence signal acquisition terminal through the bridging module. The first zero-sequence signal acquisition terminal is also grounded at one end of the second capacitor, and the other end of the second capacitor is grounded. The bridging module is used to simultaneously control the connection or disconnection between the first phase A acquisition port, the first phase B acquisition port, and the first phase C acquisition port and the first zero-sequence signal acquisition terminal.

5. The three-phase power information acquisition device according to claim 1, characterized in that, The load voltage signal acquisition terminal includes a second A-phase acquisition port, a second B-phase acquisition port, and a second C-phase acquisition port. The second A-phase acquisition port, the second B-phase acquisition port, and the second C-phase acquisition port are respectively connected to the second A-phase circuit, the second B-phase circuit, and the second C-phase circuit in the load-side line. A third capacitor is provided between the second A-phase acquisition port and the second A-phase circuit, between the second B-phase acquisition port and the second B-phase circuit, and between the second C-phase acquisition port and the second C-phase circuit.

6. The three-phase power information acquisition device according to claim 1, characterized in that, The acquisition module is also equipped with a current signal acquisition terminal, which is connected to the three phase circuits of the load-side line. The current signal acquisition terminal is used to acquire the current information of the load-side line.

7. The three-phase power information acquisition device according to claim 1, characterized in that, The acquisition module is also equipped with a second zero-sequence signal acquisition terminal, which is connected to the load-side line and is used to acquire the zero-sequence current of the load-side line.

8. A circuit breaker, characterized in that, The device includes a circuit breaker module and a three-phase power information acquisition device as described in any one of claims 1 to 7. One side of the circuit breaker module is connected to the power supply side line, and the other side of the circuit breaker module is connected to the load side line. The circuit breaker module is connected to the host computer of the three-phase power information acquisition device, and the host computer controls the connection or disconnection between the power supply side line and the load side line through the circuit breaker module.

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