Current transformer parameter detection method based on current rising wireless synchronization

Abstract

The invention provides a current transformer parameter detection method based on current rising wireless synchronization, and the method comprises the steps: collecting a first current signal of a primary side of a to-be-detected current transformer through first current collection equipment, and calculating an effective value and a phase of the first current signal; acquiring a second current signal of the load by using second current acquisition equipment, calculating an effective value and a phase of the second current signal, and transmitting the effective value and the phase of the first current signal to the second current acquisition equipment, the transformation ratio and the polarity of the current transformer to be detected are determined through the effective value and the phase of the first current signal and the effective value and the phase of the second current signal obtained by the second current acquisition device, and the first current acquisition device and the second current acquisition device cooperate with each other; the transformation ratio and the polarity of the current transformer to be detected are synchronously detected, and the parameter measurement accuracy and the use safety of the current transformer to be detected are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power detection, and in particular to a current transformer parameter detection method based on current boost wireless synchronization. Background Art

[0002] In the power system, the ratio and polarity of the current transformer are one of the more critical parameters, which are of great significance to ensure the normal operation of power equipment and the safety and stability of the power grid. At present, the traditional technical solution is based on the method of boosting the current of a large current, which can only detect the ratio of the current transformer, but the polarity of the corresponding current transformer cannot be detected. Due to the uncertainty of the polarity of the current transformer, the safe and stable operation of the power grid system will bring uncertainty and great risks. Therefore, it is urgent to propose a new technology that can simultaneously realize the detection of the ratio and polarity of the current transformer. Summary of the invention

[0003] An object of the present invention is to provide a current transformer parameter detection method based on wireless synchronization of current rise, which aims to solve the technical problem that the polarity and transformation ratio of the current transformer cannot be detected in the prior art.

[0004] To achieve the above object, the embodiment of the present application proposes a current transformer parameter detection method based on current rise wireless synchronization, and the current transformer parameter detection method includes:

[0005] Providing a current analog quantity to a current transformer to be tested through a current generator, wherein the current generator is connected to an input terminal of the current transformer to be tested;

[0006] Using a first current acquisition device to acquire a first current signal on the primary side of the current transformer to be tested, calculating an effective value and a phase of the first current signal, and transmitting the effective value and the phase of the first current signal to a second current acquisition device;

[0007] Using a second current acquisition device to acquire a second current signal of a load, and calculating an effective value and a phase of the second current signal, the load being connected to an output end of the current transformer to be tested;

[0008] The transformation ratio and polarity of the current transformer to be measured are determined by the effective value and phase of the first current signal and the effective value and phase of the second current signal obtained by the second current acquisition device.

[0009] In an implementation of the embodiment of the present application, the first current acquisition device is communicatively connected to the second current acquisition device, and the transmitting the effective value and phase of the first current signal to the second current acquisition device includes:

[0010] The effective value and phase of the first current signal are transmitted to the second current acquisition device through the wireless communication module. The present application realizes the communication connection between the first current acquisition device and the second current acquisition device through the wireless communication module, avoiding the technical problems of traditional wired transmission and complex operation, facilitating the wireless synchronization of signals between the first current acquisition device and the second current acquisition, and improving the efficiency of current transformer parameter detection.

[0011] In an implementation of the embodiment of the present application, the first current acquisition device includes a first current sensor, and the second current acquisition device includes a second current sensor;

[0012] The current transformer parameter detection method comprises: connecting the first current sensor to a cable between the current generator and the current transformer to be tested, and connecting the second current sensor to a secondary connection of the load.

[0013] In one implementation of the embodiment of the present application, the first current sensor and the second current sensor are open-type current sensors with different opening sizes, and the current measured by the first current sensor is greater than the current measured by the second current sensor. Through the technical solution of this embodiment, the first current sensor can collect a larger first current signal from the primary side of the current generator, and the second current sensor can collect a smaller second current signal from the output end of the secondary side of the current transformer to be tested, thereby obtaining a larger transformation ratio measurement range and more measurement data, and the input current signal can be autonomously adjusted according to the actual transformation ratio of the current transformer to be tested, thereby obtaining accurate measurement data, which is conducive to reducing the parameter measurement error of the current transformer to be tested and improving the parameter measurement accuracy of the current transformer to be tested.

[0014] In an implementation of the embodiment of the present application, the first current acquisition device includes a first signal adjustment module connected to the first current sensor, and a first A / D sampling module connected to the first signal adjustment module;

[0015] The current transformer parameter detection method includes: a first signal adjustment module receives a first current signal from the first current sensor and performs amplification processing, and then transmits it to the first A / D sampling module, and the first A / D sampling module converts the analog value of the first current signal into a first digital signal. The technical solution of this embodiment is conducive to eliminating some interference data, screening out more reliable parameter measurement data of the current transformer to be tested, reducing measurement errors, and improving the parameter measurement accuracy of the current transformer to be tested.

[0016] In an implementation of the embodiment of the present application, the second current acquisition device includes a second signal adjustment module connected to the second current sensor, and a second A / D sampling module connected to the second signal adjustment module;

[0017] The current transformer parameter detection method includes: a second signal adjustment module receives a second current signal from the second current sensor and performs amplification processing, and then transmits it to the second A / D sampling module, and the second A / D sampling module converts the analog value of the second current signal into a second digital signal. The technical solution of this embodiment is conducive to eliminating some interference data, screening out more reliable parameter measurement data of the current transformer to be tested, reducing measurement errors, and improving the parameter measurement accuracy of the current transformer to be tested.

[0018] In an implementation of the embodiment of the present application, the first current acquisition device includes a first data processing module connected to the first A / D sampling module, and the second current acquisition device includes a second data processing module connected to the second A / D sampling module;

[0019] The current transformer parameter detection method includes: a first data processing module receives a first digital signal from a first A / D sampling module, and converts the first digital signal into a first current signal effective value and first phase data; a second data processing module receives a second digital signal from a second A / D sampling module, and converts the second digital signal into a second current signal effective value and second phase data. The first data processing module is used to obtain an accurate parameter measurement value of the current transformer to be tested, thereby improving the parameter measurement accuracy.

[0020] In one implementation of the embodiment of the present application, the first current acquisition device includes a first communication module, the first communication module is connected to the first data processing module and transmits data to each other, the second current acquisition device includes a second communication module, the second communication module is connected to the second data processing module and transmits data to each other, and the second communication module is connected to the first communication module by wireless communication and receives data from the first communication module;

[0021] The current transformer parameter detection method comprises: a first data processing module transmits a first current signal effective value and first phase data to a first communication module; and transmits the first current signal effective value and first phase data to a second communication module through the first communication module.

[0022] In one implementation of an embodiment of the present application, a current transformer parameter detection method includes: a second communication module receives the effective value of the first current signal and the first phase data and transmits them to a second data processing module, completes clock synchronization of the first current acquisition device and the second current acquisition device through the second communication module, and determines the transformation ratio and polarity of the current transformer to be tested based on the data obtained by the second data processing module.

[0023] In an implementation of the first aspect of the present application, the current transformer parameter detection method includes: when the absolute value of the phase difference between the first current signal and the second current signal is greater than 165 degrees, it is determined that the current transformer to be tested is an additive polarity; when the absolute value of the phase difference between the first current signal and the second current signal is less than or equal to 15 degrees, it is determined that the current transformer to be tested is a subtractive polarity;

[0024] The ratio of the effective value of the second current signal to the effective value of the first current signal is calculated to determine the transformation ratio of the current transformer to be tested.

[0025] Compared with the prior art, the current transformer parameter detection method based on wireless synchronization of current rise provided by the embodiment of the present invention has the beneficial effect that: the present invention collects the first current signal of the primary side of the current transformer to be tested by a first current acquisition device and calculates the effective value and phase of the first current signal, collects the second current signal of the load by a second current acquisition device and calculates the effective value and phase of the second current signal, and transmits the effective value and phase of the first current signal to the second current acquisition device, determines the transformation ratio and polarity of the current transformer to be tested by the effective value and phase of the first current signal and the effective value and phase of the second current signal obtained by the second current acquisition device, and realizes synchronous detection of the transformation ratio and polarity of the current transformer to be tested by the cooperation between the first current acquisition device and the second current acquisition device, thereby improving the parameter measurement accuracy and use safety of the current transformer to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall flow of the current transformer parameter detection method provided by an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the working process of a first current acquisition device provided by an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the working process of the second current acquisition device provided by an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of the composition structure of a first current acquisition device provided in an embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of the composition structure of a second current acquisition device provided in an embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of the communication between the first current acquisition device and the second current acquisition device provided by an embodiment of the present invention;

[0033] Figure 7 It is an overall principle diagram of current transformer parameter detection provided by an embodiment of the present invention;

[0034] Figure 8 This is a first principle diagram of current transformer parameter detection provided by an embodiment of the present invention;

[0035] Fig. 9 This is a second principle diagram of current transformer parameter detection provided by an embodiment of the present invention;

[0036] Fig.10 It is a schematic diagram of the detection result of the second display module provided by an embodiment of the present invention.

[0037] Explanation of the accompanying drawings: first current acquisition device 100; first current sensor 10; first signal adjustment module 11; first A / D sampling module 12; first data processing module 13; first communication module 14; first display module 15; first power module 16; first battery 17; second current acquisition device 200; second current sensor 20; second signal adjustment module 21; second A / D sampling module 22; second data processing module 23; second communication module 24; second display module 25; second power module 26; second battery 27; current transformer to be tested 300; current generator 400. DETAILED DESCRIPTION

[0038] In order to make the invention purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0039] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application 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 specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0041] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [the described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [the described condition or event] is detected" or "in response to detecting [the described condition or event]" depending on the context. In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] 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 only 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.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0044] Please refer to Figure 1 and Figure 7 , Figure 1 The overall flow chart of the current transformer parameter detection method provided by the embodiment of the present invention is shown. Figure 7 The overall principle diagram of the current transformer parameter detection provided by the embodiment of the present invention. The embodiment of the present application proposes a current transformer parameter detection method based on wireless synchronization of current rise, and the current transformer parameter detection method includes:

[0045] S10: Providing a current analog quantity to the current transformer 300 to be tested through a current generator 400, wherein the current generator 400 is connected to an input terminal of the current transformer 300 to be tested;

[0046] S20: using the first current acquisition device 100 to acquire the first current signal of the primary side of the current transformer 300 to be tested, calculating the effective value and phase of the first current signal, and transmitting the effective value and phase of the first current signal to the second current acquisition device 200;

[0047] S30: using the second current acquisition device 200 to acquire a second current signal of the load, and calculating the effective value and phase of the second current signal, the load is connected to the output end of the current transformer 300 to be tested;

[0048] S40: Determine the transformation ratio and polarity of the current transformer 300 to be tested by using the effective value and phase of the first current signal and the effective value and phase of the second current signal obtained by the second current acquisition device 200.

[0049] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0050] The present invention collects the first current signal of the primary side of the current transformer 300 to be tested by the first current acquisition device 100 and calculates the effective value and phase of the first current signal, collects the second current signal of the load by the second current acquisition device 200 and calculates the effective value and phase of the second current signal, and transmits the effective value and phase of the first current signal to the second current acquisition device 200, determines the transformation ratio and polarity of the current transformer 300 to be tested by the effective value and phase of the first current signal and the effective value and phase of the second current signal obtained by the second current acquisition device 200, and realizes synchronous detection of the transformation ratio and polarity of the current transformer 300 to be tested by the cooperation between the first current acquisition device 100 and the second current acquisition device 200, thereby improving the parameter measurement accuracy and use safety of the current transformer 300 to be tested.

[0051] Please refer to Figure 6 , Figure 6 1 is a schematic diagram of a first current acquisition device 100 and a second current acquisition device 200 communicating with each other provided by an embodiment of the present invention, wherein the first current acquisition device 100 is in communication connection with the second current acquisition device 200, and the effective value and phase of the first current signal are transmitted to the second current acquisition device 200, including:

[0052] The effective value and phase of the first current signal are transmitted to the second current acquisition device 200 through the wireless communication module. Specifically, the first current acquisition device 100 is connected to the second current acquisition device 200 through the lora wireless communication module, and the lora wireless communication module connection preferably adopts the 433M frequency band, which can improve the diffraction ability of its signal. The present application realizes the communication connection between the first current acquisition device 100 and the second current acquisition device 200 through the wireless communication module, avoiding the technical problems of traditional wired transmission and complex operation, which is conducive to the wireless synchronization of the first current acquisition device 100 and the second current acquisition, and improves the efficiency of current transformer parameter detection.

[0053] Please refer to 4 and Figure 5 , Figure 4 is a schematic diagram of the composition structure of a first current acquisition device 100 provided in an embodiment of the present invention, Figure 51 is a schematic diagram of the composition structure of the second current acquisition device 200 provided in an embodiment of the present invention. As shown in the figure, the first current acquisition device 100 includes a first current sensor 10, and the second current acquisition device 200 includes a second current sensor 20. The first current sensor 10 and the second current sensor 20 are open-type current sensors with different opening sizes, and the current measured by the first current sensor 10 is greater than the current measured by the second current sensor 20. Specifically, the first current sensor 10 measures a current of 1000A to 10000A, and the second current sensor 20 measures a current of 1mA to 1A, and when actually used, the first current sensor 10 is clamped on the cable between the current generator 400 and the current transformer 300 to be measured. Furthermore, the first current sensor 10 is connected between the output end of the current generator 400 and the primary side of the current transformer 300 to be tested to collect the first current signal of the primary side of the current transformer 300 to be tested. Through the technical solution of this embodiment, the first current sensor 10 can collect and obtain a larger first current signal from the primary side of the current generator 400, and the second current sensor 20 can collect and obtain a smaller second current signal from the output end of the current generator 400, thereby obtaining a larger transformation ratio measurement range and more measurement data, and can autonomously adjust the input current signal according to the actual transformation ratio of the current transformer 300 to be tested, thereby obtaining accurate measurement data, which is beneficial to reducing the parameter measurement error of the current transformer 300 to be tested and improving the parameter measurement accuracy of the current transformer 300 to be tested.

[0054] Please refer again Figure 4 The first current acquisition device 100 includes a first signal adjustment module 11 connected to the first current sensor 10, a first A / D sampling module 12 connected to the first signal adjustment module 11, a first data processing module 13 connected to the first A / D sampling module 12, and a first communication module 14 connected to the first data processing module 13. The first communication module 14 is connected to the first data processing module 13 for communication and data transmission. The first signal adjustment module 11 is used to adjust and amplify the first current signal. The first signal adjustment module 11 selects a corresponding gear according to the input current size, thereby ensuring the accuracy and validity of the measurement data.

[0055] The first data processing module 13 includes a first MCU data processing module, and the first A / D sampling module 12 realizes the conversion of analog signals into digital signals, which is convenient for subsequent data processing and conversion. When the first current acquisition device 100 is synchronized with the second current acquisition device 200, at the synchronization time point, the first MCU data processing module of the first current acquisition device 100 controls the ADC to perform FFT data analysis on 256, 512, 1024 or 2048 data points of its current signal acquisition, thereby obtaining the first current signal amplitude and the first current signal phase value, i.e., the initial phase value, and calculating the current effective value. At the same time, the second MCU data processing module in the second current acquisition device 200 controls the ADC to perform FFT data analysis on 256, 512, 1024 or 2048 data points of its current signal acquisition, thereby obtaining the second current signal amplitude, the second current signal phase value, and calculating the current effective value.

[0056] Please refer again Figure 5 and Figure 6 The second current acquisition device 200 includes a second signal adjustment module 21 connected to the second current sensor 20, a second A / D sampling module 22 connected to the second signal adjustment module 21, a second data processing module 23 connected to the second A / D sampling module 22, and a second communication module 24 connected to the second data processing module 23. Furthermore, the second communication module 24 is wirelessly connected to the second data processing module 23 and transmits data to each other, and the second communication module 24 is wirelessly connected to the first communication module 14 and receives data from the first communication module 14.

[0057] The second signal adjustment module 21 is used to adjust and amplify the second current signal. The second signal adjustment module 21 selects the corresponding gear according to the input current size, so as to ensure the accuracy and validity of the measurement data. The second data processing module 23 includes a second MCU data processing module, and the second A / D sampling module 22 realizes the conversion of analog signals into digital signals, which is convenient for subsequent data processing and conversion. Preferably, the second current acquisition device 200 is a portable handheld device, which is convenient to carry and operate.

[0058] Please refer to Figure 8 and Fig. 9 , Figure 8 This is a first schematic diagram of current transformer parameter detection provided by an embodiment of the present invention. Fig. 9 The second schematic diagram of the current transformer parameter detection provided by the embodiment of the present invention. The current transformer to be tested includes primary windings P1 and P2, secondary windings S1 and S2, wherein P1 and S1 are the same-name terminals, and P2 and S2 are the same-name terminals. The load includes a terminal box and a protection screen, such as Figure 8 and Fig. 9 As shown, the second current acquisition device 200 can be connected to the load 1 to collect current, or can be connected to Fig. 9 On load 2 in the example, the current signal on load 2 is collected. Load 1 and load 2 may be terminal boxes or protection screens or other loads.

[0059] Please refer to Figure 2 , the data collection and data processing flow of the first current collection device 100 is described below:

[0060] S101: Connecting the first current sensor 10 to the cable between the current generator 400 and the current transformer 300 to be tested;

[0061] S102: using a first current acquisition device 100 to acquire a first current signal of the primary side of the current transformer 300 to be tested;

[0062] Through the technical solution of this embodiment, the current at the input end of the current transformer 300 to be tested can be collected by the first current collection device 100, which is conducive to obtaining accurate current data of the current transformer 300 to be tested, thereby obtaining accurate measurement data.

[0063] S103: The first signal adjustment module 11 receives the first current signal from the first current sensor 10, amplifies it, and transmits it to the first A / D sampling module 12, and converts the analog value of the first current signal into a first digital signal through the first A / D sampling module 12. The technical solution of this embodiment is conducive to eliminating some interference data, screening out more reliable parameter measurement data of the current transformer 300 to be tested, reducing measurement errors, and improving the parameter measurement accuracy of the current transformer 300 to be tested.

[0064] S104: The first data processing module 13 receives the first digital signal from the first A / D sampling module 12, and converts the first digital signal into a first current signal effective value and first phase data;

[0065] S105 : The first data processing module 13 transmits the first current signal effective value and the first phase data to the first communication module 14 ; and transmits the first current signal effective value and the first phase data to the second communication module 24 via the first communication module 14 .

[0066] Please refer to Figure 3 , the data collection and data processing flow of the second current collection device 200 is described below:

[0067] S201: Connecting the second current sensor 20 to the secondary wiring of the load;

[0068] S202: Collecting a second current signal of the load using a second current collection device 200;

[0069] Through the technical solution of this embodiment, the current at the output end of the current transformer 300 to be tested is collected by the second current collection device 200, which is conducive to obtaining accurate current data of the current transformer 300 to be tested, thereby obtaining accurate measurement data.

[0070] S203: The second signal adjustment module 21 receives the second current signal from the second current sensor 20, amplifies the second current signal, and transmits the second current signal to the second A / D sampling module 22, where the second A / D sampling module 22 converts the analog value of the second current signal into a second digital signal;

[0071] The technical solution of this embodiment is helpful to eliminate some interference data, screen out more reliable parameter measurement data of the current transformer 300 to be tested, reduce measurement errors, and improve the parameter measurement accuracy of the current transformer 300 to be tested.

[0072] S204: The second data processing module 23 receives the second digital signal from the second A / D sampling module 22, and converts the second digital signal into a second current signal effective value and second phase data;

[0073] The first data processing module 13 is used to obtain accurate parameter measurement values ​​of the current transformer 300 to be tested, thereby improving the accuracy of parameter measurement.

[0074] S205: The second communication module 24 receives the effective value of the first current signal and the first phase data and transmits them to the second data processing module 23. The clock synchronization of the first current acquisition device 100 and the second current acquisition device 200 is completed through the second communication module 24, and the transformation ratio and polarity of the current transformer 300 to be tested are determined according to the data obtained by the second data processing module 23.

[0075] S206: When the absolute value of the phase difference between the first current signal and the second current signal is greater than 165 degrees, the current transformer 300 to be tested is determined to be of additive polarity; when the absolute value of the phase difference between the first current signal and the second current signal is less than or equal to 15 degrees, the current transformer 300 to be tested is determined to be of subtractive polarity; the ratio of the effective value of the second current signal to the effective value of the first current signal is calculated to determine the transformation ratio of the current transformer 300 to be tested.

[0076] The first current acquisition device 100 includes: a first display module 15, a first power module 16 and a first battery 17. The first display module 15 is used to display the current effective value and phase of the first current signal and the working status of the first current acquisition device 100. The first power module 16 is used to power the first current acquisition device 100. The first power module 16 includes a first battery 17 management module. The first power module 16 can be connected to an external power supply, such as 220V AC power. When a long-term test is required, the external power supply can be connected through the first battery 17 management module to achieve voltage reduction, rectification and filtering to form a working power supply. The first battery 17 is a charge-discharge battery used as a backup power supply. In some scenarios where it is inconvenient to take electricity, the first battery 17 can be used to supply the first power module 16, and then the first power module 16 manages the charge and discharge of the first battery 17 and supplies power to other loads of the first current acquisition device 100.

[0077] The second current acquisition device 200 includes: a judgment module, a second display module 25, a second power module 26 and a second battery 27. The second display module 25 is used to display the effective value, phase value, phase difference of the first current signal and the second current signal and the working state of the second current acquisition device 200. The second power module 26 is used to power the second current acquisition device 200. Its working mode is the same as that of the first current acquisition device 100. Please refer to Fig.10 , Fig.10 It is a schematic diagram of the detection result of the second display module 25 provided in an embodiment of the present invention. When the parameter measurement of the current transformer 300 to be tested is completed, the second display module 25 of the second current acquisition device 200 will display the transformation ratio of the current transformer 300 to be tested and the phase and phase difference between the first current signal and the second current signal. The judgment module of the second current acquisition device 200 determines the polarity of the sensor to be tested according to a pre-set phase difference reference value. For example, when the phase difference reference value is 165 degrees or 15 degrees, when the absolute value of the phase difference between the first current signal and the second current signal is greater than 165 degrees, the judgment module determines that the current transformer 300 to be tested is an additive polarity; when the absolute value of the phase difference between the first current signal and the second current signal is less than or equal to 15 degrees, the judgment module determines that the current transformer 300 to be tested is a subtractive polarity, and displays the polarity of the current transformer 300 to be tested on the second display module 25. The phase difference reference value may be 10 degrees, 15 degrees, 30 degrees, 45 degrees, 60 degrees or the supplementary angles of the above angles.

[0078] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0079] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0080] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0081] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0082] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0083] In the embodiments provided in the present application, it should be understood that the disclosed devices / robots and methods can be implemented in other ways. For example, the device / robot embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0084] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0085] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0086] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A current transformer parameter detection method based on wireless synchronization of current rise, characterized in that: The current transformer parameter detection method comprises: Providing a current analog quantity to the current transformer to be tested through a current generator, wherein the current generator is connected to an input terminal of the current transformer to be tested; Using a first current acquisition device to acquire a first current signal on the primary side of the current transformer to be tested, calculating an effective value and a phase of the first current signal, and transmitting the effective value and the phase of the first current signal to a second current acquisition device; Using a second current acquisition device to acquire a second current signal of a load, and calculating an effective value and a phase of the second current signal, the load being connected to an output end of the current transformer to be tested; The transformation ratio and polarity of the current transformer to be measured are determined by the effective value and phase of the first current signal and the effective value and phase of the second current signal obtained by the second current acquisition device.

2. The current transformer parameter detection method according to claim 1, characterized in that: The first current acquisition device is communicatively connected to the second current acquisition device, and the transmitting the effective value and phase of the first current signal to the second current acquisition device comprises: The effective value and phase of the first current signal are transmitted to the second current acquisition device through the wireless communication module.

3. The current transformer parameter detection method according to claim 1, characterized in that: The first current acquisition device includes a first current sensor, and the second current acquisition device includes a second current sensor; The current transformer parameter detection method comprises: connecting the first current sensor to a cable between the current generator and the current transformer to be tested, and connecting the second current sensor to a secondary connection of the load.

4. The current transformer parameter detection method according to claim 3, characterized in that: The first current sensor and the second current sensor are open-type current sensors with openings of different sizes, and the current measured by the first current sensor is greater than the current measured by the second current sensor.

5. The current transformer parameter detection method according to claim 3, characterized in that: The first current acquisition device includes a first signal adjustment module connected to the first current sensor and a first A / D sampling module connected to the first signal adjustment module; The current transformer parameter detection method includes: a first signal adjustment module receives and amplifies a first current signal from the first current sensor, and then transmits it to the first A / D sampling module, and the first A / D sampling module converts the analog value of the first current signal into a first digital signal.

6. The current transformer parameter detection method according to claim 5, characterized in that: The second current acquisition device includes a second signal adjustment module connected to the second current sensor and a second A / D sampling module connected to the second signal adjustment module; The current transformer parameter detection method includes: a second signal adjustment module receives and amplifies the second current signal from the second current sensor, and then transmits it to the second A / D sampling module, and the second A / D sampling module converts the analog value of the second current signal into a second digital signal.

7. The current transformer parameter detection method according to claim 6, characterized in that: The first current acquisition device includes a first data processing module connected to the first A / D sampling module, and the second current acquisition device includes a second data processing module connected to the second A / D sampling module; The current transformer parameter detection method includes: a first data processing module receives a first digital signal from a first A / D sampling module, and converts the first digital signal into a first current signal effective value and first phase data; a second data processing module receives a second digital signal from a second A / D sampling module, and converts the second digital signal into a second current signal effective value and second phase data.

8. The current transformer parameter detection method according to claim 7, characterized in that: The first current acquisition device includes a first communication module, the first communication module is connected to the first data processing module and transmits data to each other, the second current acquisition device includes a second communication module, the second communication module is connected to the second data processing module and transmits data to each other, and the second communication module is connected to the first communication module for communication and receives data from the first communication module; The current transformer parameter detection method comprises: a first data processing module transmits a first current signal effective value and first phase data to a first communication module; The first current signal effective value and the first phase data are transmitted to the second communication module through the first communication module.

9. The current transformer parameter detection method according to claim 8, characterized in that: The current transformer parameter detection method includes: a second communication module receives the effective value of the first current signal and the first phase data and transmits them to a second data processing module, completes the clock synchronization of the first current acquisition device and the second current acquisition device through the second communication module, and determines the transformation ratio and polarity of the current transformer to be tested according to the data obtained by the second data processing module.

10. The current transformer parameter detection method according to claim 9, characterized in that: The current transformer parameter detection method comprises: when the absolute value of the phase difference between the first current signal and the second current signal is greater than 165 degrees, it is determined that the current transformer to be tested is an additive polarity; when the absolute value of the phase difference between the first current signal and the second current signal is less than or equal to 15 degrees, it is determined that the current transformer to be tested is a subtractive polarity; The ratio of the effective value of the second current signal to the effective value of the first current signal is calculated to determine the transformation ratio of the current transformer to be tested.

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