Zero point judgment method, system and device for circuit breaker zero region current measurement

Abstract

The invention discloses a zero point judgment method, system and device for circuit breaker zero region current measurement. The method comprises the steps of obtaining a power frequency curve and a residual magnetic flux attenuation curve of a circuit breaker; and determining the zero point of the zero region current of the circuit breaker according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker. The method, the system and the device can accurately judge the current zero point of the circuit breaker.

Description

Technical Field

[0001] The invention belongs to the field of large-capacity experimental measurement of circuit breakers, and relates to a zero point judgment method, system and device for measuring zero-zone current of circuit breakers. Background Art

[0002] During the large-capacity test of the circuit breaker, when the AC current passes through zero, the residual carriers in the arc gap generate zero-zone current driven by the transient recovery voltage. Accurate measurement of the zero-zone current can provide quantitative guidance for the optimal design of the switch. Since the zero-zone current signal changes quickly and its amplitude is much smaller than the short-circuit impact current in the large-capacity experiment, the corresponding sensor and measurement system are required to have a wide bandwidth and a large dynamic range.

[0003] The use of Rogowski coil sensors can better meet the above requirements, but due to the influence of arc voltage in the arcing stage, there is a large uncertainty in the current half-wave time and zero point position. In addition, the fluctuation of carriers before and after zero crossing causes a drastic change in the arc gap impedance. There is a significant high-frequency oscillation in the current waveform within the zero zone time window, which makes it difficult to accurately judge the current zero point, that is, the starting point of the zero zone current. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a zero point judgment method, system and device for circuit breaker zero zone current measurement, which can accurately judge the current zero point of the circuit breaker.

[0005] To achieve the above object, the present invention discloses a zero point determination method for circuit breaker zero zone current measurement, comprising:

[0006] Obtain the power frequency curve and residual flux attenuation curve of the circuit breaker;

[0007] The zero point of the zero zone current of the circuit breaker is determined according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker.

[0008] The further improvement of the zero point determination method for circuit breaker zero zone current measurement according to the present invention is:

[0009] Furthermore, the process of determining the zero point of the zero zone current of the circuit breaker according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker is:

[0010] The intersection of the circuit breaker's power frequency curve and the residual flux attenuation curve is taken as the zero point of the zero zone current.

[0011] The invention discloses a zero point judgment device for measuring current in zero zone of a circuit breaker, comprising a current bus, a host computer, a marking transformer, a Rogowski coil transformer, an integrator and a synchronous data acquisition unit;

[0012] The current bus is connected to the circuit breaker, and the current bus passes through the identification transformer and the Rogowski coil transformer. The output end of the Rogowski coil transformer is connected to the input end of the integrator, the output end of the integrator and the output end of the identification transformer are connected to the input end of the synchronous data acquisition unit, and the output end of the synchronous data acquisition unit is connected to the host computer.

[0013] The further improvement of the zero point determination device for circuit breaker zero zone current measurement of the present invention is:

[0014] Furthermore, the magnetic core of the identification transformer is manganese-zinc ferrite.

[0015] The present invention discloses a zero point determination method for measuring zero zone current of a circuit breaker, comprising:

[0016] Real-time acquisition of the measurement signal of the Rogowski coil transformer output by the synchronous data acquisition unit;

[0017] Acquire the measurement signal of the identification transformer output by the synchronous data acquisition unit in real time;

[0018] Draw a curve A of the current magnitude of the measurement signal of the Rogowski coil mutual inductor over time according to the measurement signal of the Rogowski coil mutual inductor obtained in real time, and determine the time t corresponding to the minimum current in the change curve A;

[0019] According to the measurement signal of the identification transformer obtained in real time, a curve B of the current magnitude of the measurement signal of the identification transformer changing with time is drawn, and the point on the change curve B corresponding to time t is used as the zero point of the zero zone current of the circuit breaker.

[0020] The further improvement of the zero point determination method for circuit breaker zero zone current measurement according to the present invention is:

[0021] Furthermore, the magnetic core of the identification transformer is manganese-zinc ferrite.

[0022] The present invention discloses a zero point determination system for measuring zero zone current of a circuit breaker, comprising the following steps:

[0023] The first acquisition module is used to acquire the measurement signal of the Rogowski coil mutual inductor output by the synchronous data acquisition unit in real time;

[0024] The second acquisition module is used to acquire the measurement signal of the identification transformer output by the synchronous data acquisition unit in real time;

[0025] A drawing module, used for drawing a curve A of the current magnitude of the measurement signal of the Rogowski coil mutual inductor over time according to the measurement signal of the Rogowski coil mutual inductor obtained in real time, and determining the time t corresponding to the minimum current in the change curve A;

[0026] The determination module is used to draw a curve B of the current magnitude of the measurement signal of the identification transformer over time according to the measurement signal of the identification transformer obtained in real time, and take the point on the change curve B corresponding to time t as the zero point of the zero zone current of the circuit breaker.

[0027] The further improvement of the zero point judgment system for circuit breaker zero zone current measurement of the present invention is:

[0028] Furthermore, the magnetic core of the identification transformer is manganese-zinc ferrite.

[0029] The present invention discloses a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the zero point determination method for measuring zero zone current of a circuit breaker are implemented.

[0030] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the zero point determination method for measuring zero zone current of a circuit breaker are realized.

[0031] The present invention has the following beneficial effects:

[0032] The zero point judgment method, system and device for measuring zero-zone current of a circuit breaker described in the present invention are described in the following way: during specific operation, according to the basic characteristics of magnetic materials, the current zero point of the circuit breaker breaking process strictly corresponds to the residual magnetic point Br of the hysteresis loop, and the residual magnetic flux Br returns to zero following the exponential decay law after the current passes through zero. According to the law of electromagnetic induction, the attenuation process will generate an induced voltage at the measuring end, and follow the same exponential decay law. Based on the above principles, the zero point of the zero-zone current of the circuit breaker is determined according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker. The operation is simple and the accuracy is high. Finally, it should be noted that the present invention is realized based on the inherent characteristics of magnetic materials under the action of current, and has the advantages of repeatability and uniqueness. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a structural diagram of the device of the present invention;

[0035] Figure 2 It is a schematic diagram of the present invention.

[0036] Among them, 1 is the identification transformer 1, 2 is the Rogowski coil transformer 2, 3 is the integrator 3, and 4 is the synchronous data acquisition unit 4. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0040] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0041] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0042] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0045] The present invention uses high-frequency magnetic materials as the magnetic core of the identification transformer 1. According to the basic characteristics of the magnetic material, the current zero point of the circuit breaker breaking process strictly corresponds to the residual magnetic point Br of the hysteresis loop. The residual magnetic flux Br returns to zero following the exponential decay law after the current passes through zero. According to the law of electromagnetic induction, the decay process will generate an induced voltage at the measuring end and follow the same exponential decay law. In addition, the power frequency curve before the current passes through zero and the residual magnetic flux decay curve follow completely different laws, so the intersection of the two curves, that is, the power frequency curve and the exponential decay curve (that is, the inflection point of the measurement curve), is the zero point of the zero zone current.

[0046] In addition, in the large current test, the identification transformer 1 may have a core saturation phenomenon, but in the non-saturation stage of the measurement cycle, that is, near the zero point of the AC current, as the current amplitude decreases, the core exits the saturation state and the zero point of the zero zone current can still be determined.

[0047] Under actual measurement conditions, the area containing the zero point will appear as a curve with a significantly changed curvature rather than an ideal inflection point. Therefore, in order to further improve the accuracy of zero point identification, curve fitting can be used to avoid the zero point area. Sampling points are taken on the curve before and after the zero point for curve fitting, and two fitting curves that coincide with the original curve are constructed respectively. The intersection of the two fitting curves is the current zero point.

[0048] Embodiment 1

[0049] This embodiment discloses a zero point determination method for measuring zero zone current of a circuit breaker, comprising the following steps:

[0050] Obtain the power frequency curve and residual flux attenuation curve of the circuit breaker;

[0051] The zero point of the zero zone current of the circuit breaker is determined according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker. Specifically, the intersection of the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker is used as the zero point of the zero zone current.

[0052] Embodiment 2

[0053] refer to Figure 1 , this embodiment discloses a zero point judgment device for measuring zero zone current of a circuit breaker, including a current bus, a host computer, an identification transformer 1, a Rogowski coil transformer 2, an integrator 3 and a synchronous data acquisition unit 4;

[0054] The current bus is connected to the circuit breaker, and the current bus passes through the identification transformer 1 and the Rogowski coil transformer 2. The output end of the Rogowski coil transformer 2 is connected to the input end of the integrator 3. The output end of the integrator 3 and the output end of the identification transformer 1 are connected to the input end of the synchronous data acquisition unit 4. The output end of the synchronous data acquisition unit 4 is connected to the host computer.

[0055] The magnetic core of the identification transformer 1 is manganese-zinc ferrite, and the diameter of the magnetic core meets the requirements for current busbar through-hole installation. The secondary side of the identification transformer 1 adopts a uniform and dense winding method to maximize the use of the core volume, increase the output amplitude or expand the unsaturated measurement range. In addition, the identification transformer 1 has an output signal amplitude and a sufficient unsaturated window width, and can be designed based on the core diameter (i.e., the average magnetic path length), magnetic permeability, number of winding turns and termination resistance. The output signal of the identification transformer 1 is connected to the input channel of the synchronous data acquisition unit 4.

[0056] The Rogowski coil mutual inductor 2 is installed through the busbar, the output signal of the Rogowski coil mutual inductor 2 is connected to the integrator 3, and the output signal of the integrator 3 is connected to the input channel of the synchronous data acquisition unit 4.

[0057] refer to Figure 2 , Figure 2 In the figure, curve A is the measurement signal of the Rogowski coil transformer 2 received by the synchronous data acquisition unit 4, and curve B is the measurement signal of the identification transformer 1 received by the synchronous data acquisition unit 4. In the synchronous sampling result, the time corresponding to the minimum current value in curve B is taken, and the point corresponding to this time on curve A is the zero point of the zero zone current.

[0058] It should be noted that determining the zero point of the zero zone current is a difficult problem in switch test technology. In the past, a method based on transient recovery voltage was often used, specifically taking the zero point of the system recovery voltage as the current zero point. In fact, due to the influence of line load characteristics, the voltage, current phase and waveform zero points are not completely the same; secondly, since the transition of the line state near the current zero point is prone to cause high-frequency interference, and the filtering method will cause signal distortion and loss of key features. In view of the above problems, the present invention has the following characteristics:

[0059] The principle of the present invention is realized based on the inherent characteristics of magnetic materials under the action of electric current, and has the advantages of repeatability and uniqueness, that is, the decay response of the residual magnetic flux and the hysteresis change process under the action of the primary current have completely different change laws, the intersection of the two can uniquely determine the current zero point, and the above laws are relatively stable for the same material.

[0060] The determination of the current zero point in the present invention is based only on the change process of the current itself, without considering the load characteristics and voltage waveform of the system, thus simplifying the determination method.

[0061] In the present invention, in the non-saturated region near the current zero point, the measurement method of the marker transformer 1 is self-integrated, which has the advantages of anti-interference and no distortion compared with the differential measurement signal of the Rogowski coil transformer 2, and is convenient for analyzing and processing the zero point characteristics.

[0062] The measuring principle of the present invention is easy to implement, and the hardware and software algorithms complement each other, providing a concise and reliable technical solution for determining the zero point of the zero-zone current.

[0063] Embodiment 3

[0064] This embodiment discloses a zero point determination method for measuring zero zone current of a circuit breaker, comprising:

[0065] Acquire the measurement signal of the Rogowski coil transformer 2 output by the synchronous data acquisition unit 4 in real time;

[0066] Acquire the measurement signal of the identification transformer 1 output by the synchronous data acquisition unit 4 in real time;

[0067] According to the measurement signal of the Rogowski coil mutual inductor 2 acquired in real time, a curve A of the current magnitude of the measurement signal of the Rogowski coil mutual inductor 2 versus time is drawn, and the time t corresponding to the minimum current in the change curve A is determined;

[0068] According to the real-time acquired measurement signal of the identification transformer 1, a curve B of the current magnitude of the measurement signal of the identification transformer 1 over time is drawn, and the point on the variation curve B corresponding to time t is used as the zero point of the zero zone current of the circuit breaker.

[0069] Embodiment 4

[0070] This embodiment discloses a zero point determination system for measuring zero zone current of a circuit breaker, comprising the following steps:

[0071] A first acquisition module is used to acquire the measurement signal of the Rogowski coil transformer 2 output by the synchronous data acquisition unit 4 in real time;

[0072] The second acquisition module is used to acquire the measurement signal of the identification transformer 1 output by the synchronous data acquisition unit 4 in real time;

[0073] A drawing module, used for drawing a curve A of the current magnitude of the measurement signal of the Rogowski coil mutual inductor 2 over time according to the measurement signal of the Rogowski coil mutual inductor 2 acquired in real time, and determining the time t corresponding to the minimum current in the change curve A;

[0074] The determination module is used to draw a curve B of the current magnitude of the measurement signal of the identification transformer 1 over time according to the measurement signal of the identification transformer 1 obtained in real time, and take the point on the change curve B corresponding to time t as the zero point of the zero zone current of the circuit breaker.

[0075] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0076] Embodiment 3

[0077] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the zero point judgment method for measuring the zero zone current of a circuit breaker are implemented, for example, comprising: acquiring the measurement signal of a Rogowski coil transformer 2 output by a synchronous data acquisition unit 4 in real time; acquiring the measurement signal of an identification transformer 1 output by the synchronous data acquisition unit 4 in real time; drawing a curve A of the change of the current magnitude of the measurement signal of the Rogowski coil transformer 2 over time according to the measurement signal of the Rogowski coil transformer 2 acquired in real time, and determining the time t corresponding to the minimum current in the change curve A; drawing a curve B of the change of the current magnitude of the measurement signal of the identification transformer 1 over time according to the measurement signal of the identification transformer 1 acquired in real time, and taking the point on the change curve B corresponding to the time t as the zero point of the zero zone current of the circuit breaker. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, network interface, and memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0078] Embodiment 4

[0079] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the zero point judgment method for measuring the zero zone current of a circuit breaker are implemented, for example, including: obtaining the measurement signal of the Rogowski coil transformer 2 output by the synchronous data acquisition unit 4 in real time; obtaining the measurement signal of the identification transformer 1 output by the synchronous data acquisition unit 4 in real time; drawing a curve A of the current magnitude of the measurement signal of the Rogowski coil transformer 2 over time according to the measurement signal of the Rogowski coil transformer 2 obtained in real time, and determining the time t corresponding to the minimum current in the change curve A; drawing a curve B of the current magnitude of the measurement signal of the identification transformer 1 over time according to the measurement signal of the identification transformer 1 obtained in real time, and taking the point on the change curve B corresponding to time t as the zero point of the zero zone current of the circuit breaker. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory, etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, and the like.

[0080] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0081] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0082] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0084] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0085] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A zero point determination method for measuring zero zone current of a circuit breaker, characterized in that: include: Obtain the power frequency curve and residual flux attenuation curve of the circuit breaker; The zero point of the zero zone current of the circuit breaker is determined according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker.

2. The zero point determination method for circuit breaker zero zone current measurement according to claim 1, characterized in that: The process of determining the zero point of the zero zone current of the circuit breaker according to the power frequency curve and the residual magnetic flux attenuation curve of the circuit breaker is as follows: The intersection of the circuit breaker's power frequency curve and the residual flux attenuation curve is taken as the zero point of the zero zone current.

3. A zero point determination device for measuring zero zone current of a circuit breaker, characterized in that: It includes a current bus, a host computer, a marking transformer (1), a Rogowski coil transformer (2), an integrator (3) and a synchronous data acquisition unit (4); The current bus is connected to the circuit breaker, and the current bus passes through the identification transformer (1) and the Rogowski coil transformer (2). The output end of the Rogowski coil transformer (2) is connected to the input end of the integrator (3). The output end of the integrator (3) and the output end of the identification transformer (1) are connected to the input end of the synchronous data acquisition unit (4). The output end of the synchronous data acquisition unit (4) is connected to a host computer.

4. The zero point determination device for circuit breaker zero zone current measurement according to claim 1, characterized in that: The magnetic core of the marking transformer (1) is manganese-zinc ferrite.

5. A zero point determination method for measuring zero zone current of a circuit breaker, characterized in that: The zero point determination device for measuring zero zone current of a circuit breaker according to claim 3 comprises: Acquiring in real time a measurement signal of a Rogowski coil mutual inductor (2) output by a synchronous data acquisition unit (4); Acquiring in real time a measurement signal of the identification transformer (1) output by a synchronous data acquisition unit (4); According to the measurement signal of the Rogowski coil mutual inductor (2) obtained in real time, a curve A of the current magnitude of the measurement signal of the Rogowski coil mutual inductor (2) is drawn over time, and the time t corresponding to the minimum current in the change curve A is determined; According to the measurement signal of the identification transformer (1) obtained in real time, a curve B showing the change of the current magnitude of the measurement signal of the identification transformer (1) over time is drawn, and the point on the change curve B corresponding to time t is used as the zero point of the zero zone current of the circuit breaker.

6. The zero point determination method for circuit breaker zero zone current measurement according to claim 5, characterized in that: The magnetic core of the marking transformer (1) is manganese-zinc ferrite.

7. A zero point determination system for circuit breaker zero zone current measurement, based on the zero point determination method for circuit breaker zero zone current measurement according to claim 1, comprising the following steps: A first acquisition module is used to acquire in real time a measurement signal of a Rogowski coil mutual inductor (2) output by a synchronous data acquisition unit (4); A second acquisition module, used for acquiring in real time the measurement signal of the identification transformer (1) output by the synchronous data acquisition unit (4); A drawing module, used for drawing a curve A of the current magnitude of the measurement signal of the Rogowski coil mutual inductor (2) over time according to the measurement signal of the Rogowski coil mutual inductor (2) obtained in real time, and determining the time t corresponding to the minimum current in the change curve A; The determination module is used to draw a curve B of the change of the current magnitude of the measurement signal of the identification transformer (1) over time based on the measurement signal of the identification transformer (1) obtained in real time, and to use the point on the change curve B corresponding to time t as the zero point of the zero zone current of the circuit breaker.

8. The zero point determination system for circuit breaker zero zone current measurement according to claim 7, characterized in that: The magnetic core of the marking transformer (1) is manganese-zinc ferrite.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the zero point determination method for circuit breaker zero zone current measurement as claimed in claim 5 or 6 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the zero point determination method for circuit breaker zero zone current measurement as claimed in claim 5 or 6 are implemented.

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