CN114137469A - Method and system for realizing intelligent calibration of multi-tap current transformer - Google Patents
Method and system for realizing intelligent calibration of multi-tap current transformer Download PDFInfo
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- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention discloses a method and a system for realizing intelligent calibration of a multi-tap current transformer, which output primary large current signals to the primary side of the multi-tap current transformer, synchronously sample secondary current signals to different taps of the secondary side of the multi-tap current transformer, and finally compare and analyze secondary side current data and primary side current data to finish a test, thereby realizing field closed loop maintenance tests of simultaneous transformation ratio, polarity and the like of different taps of the multi-tap current transformer, testing the functions of the transformer such as transformation ratio, polarity and the like of the multi-tap transformer, and performing integral return calibration by matching with field secondary protection return to realize a primary and secondary integral loop fusion test, realizing early warning and quick elimination of faults, improving operation and maintenance efficiency, ensuring safe operation of a power grid, and solving the problem that the secondary side loop of the current transformer can not be calibrated at present, the problem of one-time simultaneous checking and testing of the multi-tap mutual inductor can not be solved.
Description
Technical Field
The invention belongs to the field of intelligent substation multi-tap transformer calibration, and relates to a method and a system for realizing intelligent calibration of a multi-tap current transformer.
Background
In an intelligent substation, a current transformer plays an important role, is one of important components in the whole power system, converts primary-side large current into secondary small current by utilizing electromagnetic induction characteristics, and provides an initial signal source for systems such as protection, measurement and control, metering, wave recording and the like of the intelligent substation, so that the advantages and the disadvantages of functions and performance of the current transformer directly influence the safe and reliable operation of a power grid. When the secondary current loop has wiring errors and the transformation ratio polarity is abnormal, the protection equipment is easy to avoid moving or refusing to move, and the reliability of power supply of the transformer substation is reduced. In addition, once the current transformer is opened, the high voltage generated on the secondary return side is very easy to cause equipment damage and life accidents, and therefore, for a newly-built or regularly-checked intelligent substation, related function and performance verification needs to be carried out on the transformer.
At present, the related detection tools and methods of the current transformer are mainly divided into two types, one type is a current rising method, and an alternating current source required by the method generally adopts the principles of station power consumption, a current rising device, a switching power supply and the like, wherein the station power consumption is 220V single-phase alternating current or 380V three-phase alternating current in a station, and is matched with a secondary signal acquisition device to perform related measurement. The method has the advantages of more used equipment, larger volume and inconvenient carrying and moving, and can not realize one-time simultaneous check and test on the multi-tap mutual inductor; the other type is that a current method is used for verifying transformation ratio and the like of the current transformer, the method is simple in equipment, but the method cannot be used for verifying a secondary side loop of the current transformer and cannot be used for performing one-time simultaneous verification test on a multi-tap transformer. In summary, in the aspect of multi-tap transformer testing, no related device or method is available for realizing a method or device for one-time simultaneous field detection.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a method and a system for realizing intelligent verification of a multi-tap current transformer based on the principle that the operation and the inspection of an intelligent substation are simpler, more intelligent and more convenient. The method for comparing the first cycle wave of the primary signal and the second cycle wave of the secondary signal is used for completing simultaneous checking and testing of a plurality of transformation ratios and polarities of the multi-tap current transformer, so that potential safety hazards of the current transformer are eliminated in time, and the safe and reliable operation of the intelligent transformer substation is guaranteed.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for realizing intelligent calibration of a multi-tap current transformer comprises the following steps:
outputting a primary current signal to the primary side of the multi-tap current transformer, storing the data of the output primary current signal, and feeding back the stored data of the primary current signal;
and synchronously sampling secondary current signals of different taps of the secondary side of the multi-tap current transformer, storing the sampled data, and carrying out contrastive analysis on the secondary side current data and the primary side current data of different taps of the multi-tap current transformer to finish the test.
The invention is further improved in that:
and storing and recording the waveform of the primary high-current signal as Z0, wherein the effective amplitude of the output primary current signal is X, the initial phase is 90 degrees, the waveform starting time is T0, and the duration is 5S.
And the effective amplitude of the output secondary side current signal is Yn, the initial phase is recorded as Mn, the waveform starting time is Tn, wherein n represents tap serial numbers of different transformers, and the waveform of the secondary side current signal sampling data is stored and recorded as Zn.
The method for contrastively analyzing the secondary side current data and the primary side current data of different taps of the multi-tap current transformer comprises the following steps:
combining the waveform Z0 and Zn, combining and aligning the starting time T0 and Tn, and then judging the polarity of the current transformer:
when the combined obtained data meets the condition that the angle is | 90-Mn | <90 °, the corresponding tap n of the current transformer is positive, and the corresponding transformation ratio is X: Yn;
when the combined data does not satisfy | 90-Mn | <90 °, the corresponding tap n of the current transformer is of opposite polarity, and the corresponding transformation ratio is X: Yn.
The primary current signal is output through a cable.
And the primary side current signal and the secondary side current signal are subjected to data storage in a transient recording mode.
The secondary current signal sampling method comprises the following steps:
and synchronously sampling different taps of the multi-tap current transformer through the pincerlike transformer.
A system for realizing the intelligent calibration of a multi-tap current transformer comprises a local signal source module and a handheld acquisition control terminal module;
the local signal source module is used for outputting a primary current signal to the primary side of the multi-tap current transformer, storing the output primary current signal in data and feeding back the stored data of the primary current signal;
and the handheld acquisition terminal module is used for synchronously sampling secondary current signals of different taps of the secondary side of the multi-tap current transformer, storing the sampled data, and carrying out contrastive analysis on the secondary side current data and the primary side current data of different taps of the multi-tap current transformer to finish the test.
A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when executing the computer program.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for realizing intelligent calibration of a multi-tap current transformer, which realizes on-site closed-loop maintenance tests of simultaneous transformation ratio, polarity and the like of different taps of the multi-tap current transformer by comparing and analyzing secondary side current data and primary side current data of different taps of the multi-tap current transformer, realizes effective sampling of secondary side signals of the current transformer by synchronously sampling secondary current signals of different taps of the secondary side of the multi-tap current transformer, not only effectively tests the functions of transformation ratio, polarity and the like of the transformer on the multi-tap transformer, but also can be matched with on-site secondary protection to carry out integral return calibration, realizes a secondary integral return fusion test, is beneficial to operation and maintenance staff to find that a secondary device and a return fault exist in an intelligent substation in time, realizes early warning and quick elimination of the fault, the field operation and maintenance efficiency of the intelligent substation is greatly improved, and the safe and reliable operation of a power grid is guaranteed.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of multi-terminal polarity, transformation ratio synchronous calibration of a multi-tap current transformer;
FIG. 2 is a schematic diagram of an intelligent calibration method for a multi-tap current transformer;
FIG. 3 is a schematic diagram of a signal source structure;
fig. 4 shows the structural principle of the handheld acquisition control terminal.
Detailed description of the invention
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention mainly introduces a method for realizing intelligent calibration of a multi-tap current transformer, solves the problem that a plurality of taps of the multi-tap current transformer cannot simultaneously perform transformation ratio and polarity tests, completes a primary through-flow test of an intelligent substation, can timely eliminate potential safety hazards caused by abnormity of the multi-tap current transformer and a secondary current integral loop, and finally ensures safe and reliable operation of the intelligent substation.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, an embodiment of the present invention discloses a method for implementing intelligent calibration of a multi-tap current transformer, including the following steps: transmitting a power output control command; outputting a primary current signal to the primary side of the multi-tap current transformer, and storing data of the output primary current signal; feeding back the stored data of the primary current signal; synchronously sampling secondary current signals of different taps on the secondary side of the multi-tap current transformer, and storing sampling data; and comparing and analyzing the secondary side current data and the primary side current data of different taps of the multi-tap current transformer to finish the test. And storing and recording the waveform of the primary high-current signal as Z0, wherein the effective amplitude of the output primary current signal is X, the initial phase is 90 degrees, the waveform starting time is T0, and the duration is 5S. And the effective amplitude of the output secondary side current signal is Yn, the initial phase is recorded as Mn, the waveform starting time is Tn, wherein n represents tap serial numbers of different transformers, and the waveform of the secondary side current signal sampling data is stored and recorded as Zn. The method for contrastively analyzing the secondary side current data and the primary side current data of different taps of the multi-tap current transformer comprises the following steps: combining the waveform Z0 and Zn, combining and aligning the starting time T0 and Tn, and then judging the polarity of the current transformer: when the combined data meets the condition that the angle is | 90-Mn | <90 °, the corresponding tap n of the current transformer is positive, and the corresponding transformation ratio is X: Yn; when the combined data does not satisfy | 90-Mn | <90 °, the corresponding tap n of the current transformer is of opposite polarity, and the corresponding transformation ratio is X: Yn. The primary current signal is output through a cable. And the primary side current signal and the secondary side current signal are subjected to data storage in a transient recording mode. The secondary current signal sampling method comprises the following steps: and synchronously sampling different taps of the multi-tap current transformer through the pincerlike transformer.
Referring to fig. 2, the embodiment of the invention discloses a system for realizing intelligent calibration of a multi-tap current transformer, which comprises a handheld acquisition control terminal module and a local signal source module; the local signal source module is used for outputting a primary current signal to the primary side of the multi-tap current transformer, storing the output primary current signal in data, and then feeding back the stored primary current signal data; the handheld acquisition control terminal module is used for sending a power output control command, synchronously sampling secondary current signals of different taps of the multi-tap current transformer and storing sampling data; and comparing and analyzing the secondary side current data and the primary side current data of different taps of the multi-tap current transformer to finish the test.
Referring to fig. 3, the in-situ signal source module includes a power supply plug-in, a CPU plug-in and a current amplifier plug-in; the power supply plug-in is used for providing a power supply and a driving power supply for the CPU plug-in and the current amplifier plug-in; the CPU plug-in is used for receiving the current output command, executing current output, simultaneously storing output data and transmitting the stored data to the handheld acquisition control terminal module; the current amplifier plug-in is used for realizing synchronous output of signals.
Referring to fig. 4, the handheld acquisition control terminal module includes a power supply unit, a CPU unit, and a current acquisition unit; the power supply unit is used for providing a power supply and a driving power supply for the CPU unit and the current acquisition unit; the current acquisition unit is used for acquiring a secondary current signal, converting the secondary current signal into a digital signal and transmitting the digital signal to the CPU unit; the CPU module is used for establishing a remote data interaction channel with the local signal source module, storing the received primary current data and the received secondary current data and then carrying out analysis and calculation.
In the technical scheme disclosed by the invention, the primary side of the multi-tap current transformer is a common part, and different taps convert primary current into different secondary current signals by utilizing the electromagnetic induction principle to form a plurality of transformers with different transformation ratios.
Specifically, the system disclosed by the invention is divided into a handheld acquisition control terminal and a local signal source aiming at the test and verification of the multi-tap current transformer;
the handheld acquisition control terminal performs remote primary current output control on the local signal source through a wireless signal, and performs wireless clock synchronization by taking the handheld acquisition control terminal as a reference to realize information interaction control. The local signal source is provided with 2 paths of current output channels which are synthesized into 200A, the current output channels can simulate alternating current and direct current signals with different amplitudes, the simulation of secondary side current loop signals of the CT mutual inductor of the intelligent substation is achieved, and meanwhile, when the analog quantity current signals are output, the local signal source can record and feed back the signals to the handheld acquisition control terminal in a transient wave recording mode; the handheld acquisition control terminal is internally provided with 3 paths of secondary current analog quantity sampling wave recording channels, secondary side current signals of the mutual inductor can be acquired in a non-contact mode through the clamp line mutual inductor, transient wave recording of the secondary side current signals of the mutual inductor is carried out in a constant value trigger mode, secondary side current wave recording files and primary side current wave recording files of different taps of the multi-tap current mutual inductor are compared and calculated, and finally a set of closed loop test system for realizing intelligent check of the multi-tap current mutual inductor is formed.
And carrying out comprehensive verification test on the polarity, the transformation ratio and the like of the multi-tap current transformer by using a first-cycle comparison and data comparison analysis method. And applying a primary current signal with an initial phase of 90 degrees on the primary side of the multi-tap current transformer, carrying out transient recording, acquiring secondary current signals of different taps of the current transformer by using the pincerlike transformer, and simultaneously carrying out transient recording. For the polarity test, the initial phase of the secondary current signal is judged, theoretically, the initial phase of the secondary current signal is positive 90 degrees when the secondary current signal is positive in polarity, the initial phase of the secondary current signal is negative 90 degrees when the secondary current signal is negative in amplitude polarity, and considering the test error. For the transformation ratio test, the ratio value of the effective value of the transient recording of the primary current signal to the effective value of the transient recording of the secondary current signal is obtained.
The invention discloses an intelligent checking method of a multi-tap current transformer, which is implemented according to the following principle:
the principle of the current transformer is that an analog quantity large current signal on a primary side is converted into an analog quantity secondary signal through an electromagnetic induction principle, the primary side of the multi-head current transformer is a common part, different taps on a secondary side represent different transformation ratios, and the different taps convert primary current into different secondary current signals through the electromagnetic induction principle to form a plurality of transformers with different transformation ratios. The method for implementing the intelligent verification of the multi-tap current transformer comprises the following steps:
firstly, the handheld acquisition control terminal wirelessly clocks a local signal source, ensures clock synchronization, remotely controls the local signal source to output 1 path of primary heavy current analog quantity signals to the primary side of the CT current transformer, and simultaneously records the output primary heavy current analog quantity in a transient wave recording mode and feeds back the output primary heavy current analog quantity signals to the handheld acquisition control terminal. Secondly, the handheld acquisition control terminal utilizes the pincerlike transformer to simultaneously sample the secondary tap of the multi-tap current transformer without contact with a secondary current signal, and performs transient recording; finally, comparing, analyzing and calculating the primary heavy current analog quantity signal waveform recorded by the transient state of the local signal source and the secondary current signal waveforms of a plurality of taps recorded by the transient state of the handheld acquisition control terminal to complete the transformation ratio and polarity synchronous check test of the plurality of taps of the multi-tap current transformer
The invention discloses an implementation mode of an intelligent checking system of a multi-tap current transformer, which comprises the following steps:
the intelligent calibration system of the multi-tap current transformer mainly comprises a primary heavy current output signal realized by an on-site signal source and a secondary signal acquisition and control analysis system consisting of a handheld acquisition control terminal, and the handheld acquisition control terminal and the on-site signal source are distributed by utilizing wireless communication under the coordination of first-cycle wave comparison.
The local signal source is realized by adopting a distributed plug-in structure and comprises a power supply plug-in, a CPU plug-in, 2 current amplifier plug-ins and the like, and the current amplifier plug-ins can be expanded according to requirements in practical application. The power supply plug-in provides a power supply and a driving power supply for the CPU plug-in and the current amplifier plug-in; the current amplifier plug-in unit is composed of 3 groups of analog signal sources, a single current amplifier plug-in unit can output 100A large current, and different current amplifier plug-in units realize synchronous output of signals under the control of a CPIE bus, so that the large current requirements of different application sites are met; the CPU plug-in is composed of a DA conversion module, an FPGA, an ARM and a monitoring unit, the DA conversion module controls a current amplifier plug-in to carry out amplitude flexible output, the FPGA control module drives a relay to carry out physical isolation and synchronous control output on different current output plug-ins, the precision of heavy current output and the smoothness of waveforms are ensured, the ARM carries out related logic calculation and wave recording storage functions, the FPGA carries out heavy current output, meanwhile, the waveform of the heavy current is recorded and output in a transient wave recording mode, meanwhile, the ARM controls a wireless interface module to communicate with a handheld acquisition control terminal, and therefore the CPU plug-in can receive a current output command sent by the handheld acquisition control terminal remotely and can transmit a transient wave recording file to the handheld acquisition control terminal; the monitoring unit monitors the current amplifier plug-in unit, and can give an alarm in time and protect the test equipment when the current output channel has an open circuit fault.
The handheld acquisition control terminal adopts a handheld modular design and comprises a power module, a CPU module, 3 current acquisition modules and the like. The power supply module provides a power supply and a driving power supply for the CPU module and the current acquisition module; the current acquisition module is composed of an acquisition unit, an operational amplifier and an AD conversion module, the acquisition unit realizes non-contact acquisition of a secondary current signal of the mutual inductor through an external pincerlike mutual inductor and transmits the secondary current signal to the operational amplifier, the operational amplifier transmits the secondary current signal to the AD conversion module after filtering and signal amplification, and the AD conversion module converts data into a digital signal and transmits the digital signal to the CPU module through a PCIE bus; the CPU module is composed of an FPGA, an ARM and a monitoring unit, the FPGA carries out hardware time stamping and data merging processing on currents transmitted by different acquisition modules by adopting signals, the processed data are transmitted to the ARM, the ARM carries out related logic calculation, the ARM carries out transient recording and storage on the data according to a control command of an upper computer, and a platform is provided for subsequent test data analysis and calculation; meanwhile, the ARM controls the wireless interface module to communicate with a local signal source, and a remote data interaction channel is constructed; the monitoring unit monitors the current acquisition module, the CPU module and the like, and timely alarms and protects related equipment when the current sampling channel is abnormal.
An embodiment of the present invention provides a terminal device, where the terminal device of the embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. The processor realizes the steps of the above-mentioned method embodiments when executing the computer program. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program.
The computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention.
The terminal device can be a desktop computer, a notebook, a palm computer, a cloud server and other computing devices. The terminal device may include, but is not limited to, a processor, a memory.
The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
The memory may be used for storing the computer programs and/or modules, and the processor may implement various functions of the terminal device by executing or executing the computer programs and/or modules stored in the memory and calling data stored in the memory.
The terminal device integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-only memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for realizing intelligent calibration of a multi-tap current transformer is characterized by comprising the following steps:
outputting a primary current signal to the primary side of the multi-tap current transformer, storing the data of the output primary current signal, and feeding back the stored data of the primary current signal;
and synchronously sampling secondary current signals of different taps of the secondary side of the multi-tap current transformer, storing the sampled data, and carrying out contrastive analysis on the secondary side current data and the primary side current data of different taps of the multi-tap current transformer to finish the test.
2. The method for realizing intelligent calibration of a multi-tap current transformer according to claim 1, wherein the effective amplitude of the output primary current signal is X, the initial phase is 90 °, the waveform starting time is T0, and the duration of the primary current signal is 5S, and the waveform of the primary current signal is stored and recorded as Z0.
3. The method as claimed in claim 2, wherein the output secondary side current signal has an effective amplitude of Yn, an initial phase recorded as Mn, a waveform start time of Tn, where n represents a tap serial number of a different transformer, and the secondary side current signal sampling data waveform is stored and recorded as Zn.
4. The method for realizing intelligent calibration of a multi-tap current transformer according to claim 3, wherein the method for performing comparative analysis on the secondary side current data and the primary side current data of different taps of the multi-tap current transformer comprises the following steps:
combining the waveform Z0 and Zn, combining and aligning the starting time T0 and Tn, and then judging the polarity of the current transformer:
when the combined obtained data meets the condition that the angle is | 90-Mn | <90 °, the corresponding tap n of the current transformer is positive, and the corresponding transformation ratio is X: Yn;
when the combined data does not satisfy | 90-Mn | <90 °, the corresponding tap n of the current transformer is of opposite polarity, and the corresponding transformation ratio is X: Yn.
5. The method for intelligent verification of a multi-tap current transformer according to claim 1, wherein the primary current signal is output through a cable.
6. The method of claim 1, wherein the primary-side current signal and the secondary-side current signal are stored in a transient recording manner.
7. The method for realizing intelligent calibration of a multi-tap current transformer according to claim 6, wherein the secondary current signal sampling method comprises:
and synchronously sampling different taps of the multi-tap current transformer through the pincerlike transformer.
8. A system for realizing the intelligent calibration of a multi-tap current transformer is characterized by comprising a local signal source module and a handheld acquisition control terminal module;
the local signal source module is used for outputting a primary current signal to the primary side of the multi-tap current transformer, storing the output primary current signal in data and feeding back the stored data of the primary current signal;
and the handheld acquisition terminal module is used for synchronously sampling secondary current signals of different taps of the secondary side of the multi-tap current transformer, storing the sampled data, and carrying out contrastive analysis on the secondary side current data and the primary side current data of different taps of the multi-tap current transformer to finish the test.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| CN115980654A (en) * | 2023-02-03 | 2023-04-18 | 广州市德珑电子器件有限公司 | Current transformer detection method and system |
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