Current monitoring device and current monitoring method of transformer

Abstract

The invention relates to the technical field of power equipment monitoring, in particular to a current monitoring device and method for a transformer, and the device comprises an acquisition assembly which is installed on a grounding wire of a transformer iron core and a clamp in a non-contact manner, and is used for collecting a first current signal of the transformer iron core and a second current signal of the clamp; the control assembly monitors whether the transformer iron core has leakage current and whether the clamp has leakage current according to the first current signal and the second current signal, and sends an alarm signal to the alarm assembly when the transformer iron core has leakage current and / or the clamp has leakage current; the alarm assembly carries out acoustic alarm reminding and / or optical alarm reminding after receiving the alarm signal of the control assembly. Therefore, the problems that an existing power equipment monitoring method is insufficient in monitoring precision, single in alarm mechanism, low in integration level and incapable of adapting to different working condition requirements are solved, real-time monitoring of the leakage current of the transformer iron core and the clamp is achieved, and equipment safety and operation and maintenance efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of power equipment monitoring technology, and in particular to a transformer current monitoring device and current monitoring method. Background Technology

[0002] The leakage current of transformer cores and clamps is a key indicator for assessing the insulation condition of equipment. Traditional monitoring methods primarily rely on periodic manual inspections and offline tests. However, this approach has significant limitations. Manual inspections and offline tests cannot track changes in leakage current in real time, resulting in extremely poor timeliness. If anomalies in the equipment's insulation condition occur between inspections, they are difficult to detect promptly, potentially leading to further deterioration of equipment malfunctions or even serious safety accidents.

[0003] While some online monitoring devices for monitoring leakage current in transformer cores and clamps have emerged on the market, these devices still have many shortcomings in practical applications. In terms of monitoring accuracy, most devices fall short of ideal levels, leading to discrepancies between monitoring data and actual conditions. Alarm mechanisms are also simplistic. Furthermore, these devices have low integration levels, with a lack of effective coordination between various functional modules. Summary of the Invention

[0004] This application provides a current monitoring device and method for transformers to solve the problems of insufficient monitoring accuracy, single alarm mechanism and low integration of existing power equipment monitoring methods, which cannot adapt to different operating conditions. It realizes real-time monitoring of leakage current of transformer core and clamps, and improves equipment safety and operation and maintenance efficiency.

[0005] A first aspect of this application provides a transformer current monitoring device, including a data acquisition component, a control component, and an alarm component. The data acquisition component is non-contactly installed on the grounding wire of the transformer core and clamping components, and is used to acquire a first current signal from the transformer core and a second current signal from the clamping components. The control component is connected to the data acquisition component and is used to monitor whether leakage current exists in the transformer core and the clamping components based on the first and second current signals. When leakage current exists in the transformer core and / or the clamping components, the control component sends an alarm signal to the alarm component. The alarm component is connected to the control component and is used to provide an acoustic alarm and / or an optical alarm upon receiving the alarm signal from the control component.

[0006] Optionally, the above-mentioned transformer current monitoring device includes: a signal processing component, which is connected to the acquisition component and the control component respectively, for processing the first current signal and the second current signal output by the acquisition component, and sending the processed first current signal and second current signal to the control component, so as to monitor whether there is leakage current in the transformer core or the clamping component through the control component.

[0007] Optionally, the signal processing component includes: a filtering unit connected to the acquisition component, which filters the first current signal and the second current signal output by the acquisition component; an amplification unit connected to the filtering unit, which amplifies the filtered first current signal and the second current signal; and a digital-to-analog conversion unit connected to the amplified first current signal and the second current signal, which performs analog-to-digital conversion on the amplified first current signal and the second current signal to obtain the current value of the transformer core and the current value of the clamp, respectively, and sends them to the control component.

[0008] Optionally, the above-mentioned transformer current monitoring device further includes: a display component connected to the processing component, used to display the current value of the transformer core and the current value of the clamp.

[0009] Optionally, the control component further includes: a human-machine interface for receiving an alarm threshold set by a user; and a detection unit for detecting whether the current value of the transformer core is greater than the alarm threshold and whether the current value of the clamp is greater than the alarm threshold, and issuing an alarm signal when the current value of the transformer core is greater than the alarm threshold and / or the current value of the clamp is greater than the alarm threshold.

[0010] Optionally, the alarm component further includes: an acoustic alarm unit connected to the control component, used to provide an acoustic alarm reminder after receiving an alarm signal sent by the control component; and / or an optical alarm unit connected to the control component, used to provide an optical alarm reminder after receiving an alarm signal sent by the control component.

[0011] Optionally, the above-mentioned transformer current monitoring device further includes: a power supply component for powering the device for monitoring the current of the transformer core and clamps, the power supply component including a first power supply and a second power supply for switching the second power supply to provide power when the first power supply fails, or switching the first power supply to provide power when the second power supply fails.

[0012] Optionally, the above-mentioned transformer current monitoring device further includes: a communication component, which is connected to the control component, and is used to send the alarm signal sent by the control component to a remote monitoring platform.

[0013] Optionally, the acquisition component is a Rogowski coil sensor.

[0014] A second aspect of this application provides a method for monitoring the current of a transformer, using the aforementioned transformer current monitoring device. The method includes: acquiring a first current signal of the transformer core and a second current signal of the clamp; monitoring whether there is leakage current in the transformer core and the clamp based on the first current signal and the second current signal; and sending an acoustic alarm and / or an optical alarm when there is leakage current in the transformer core and / or the clamp.

[0015] In the above embodiment, a data acquisition component collects a first current signal from the transformer core and a second current signal from the clamping components. A control component monitors for leakage current in the transformer core and clamping components based on these signals. When leakage current is detected in the transformer core and / or clamping components, an alarm signal is sent to an alarm component. Upon receiving the alarm signal from the control component, the alarm component provides an acoustic and / or optical alarm. This solves the problems of insufficient monitoring accuracy, simplistic and low-integration alarm mechanisms, difficulty in intuitively displaying real-time current values, and inability to adapt to different operating conditions in existing power equipment monitoring methods. It achieves real-time monitoring, visual display, and intelligent alarm of leakage current in the transformer core and clamping components, improving equipment safety and operational efficiency.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of a transformer current monitoring device according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of a transformer current monitoring device according to an embodiment of this application;

[0020] Figure 3 This is a flowchart of current monitoring of a transformer according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of an alarm process according to an embodiment of this application;

[0022] Figure 5 This is a flowchart of a transformer current monitoring method according to an embodiment of this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0024] The following description, with reference to the accompanying drawings, describes a transformer current monitoring device and method according to embodiments of this application. Addressing the problems mentioned in the background art regarding insufficient monitoring accuracy, simplistic and low-integration alarm mechanisms, difficulty in intuitively displaying real-time current values, and inability to adapt to different operating conditions in existing power equipment monitoring methods, this application provides a transformer current monitoring device. In this device, a data acquisition component collects a first current signal from the transformer core and a second current signal from the clamping components. A control component monitors whether leakage current exists in the transformer core and clamping components based on the first and second current signals. When leakage current exists in the transformer core and / or clamping components, an alarm signal is sent to an alarm component. Upon receiving the alarm signal from the control component, the alarm component provides an acoustic alarm and / or an optical alarm. This solves the problems of insufficient monitoring accuracy, simplistic and low-integration alarm mechanisms, difficulty in intuitively displaying real-time current values, and inability to adapt to different operating conditions in existing power equipment monitoring methods. It achieves real-time monitoring, visual display, and intelligent alarm of leakage current in the transformer core and clamping components, improving equipment safety and operational efficiency.

[0025] Specifically, Figure 1 This is a schematic diagram of a transformer current monitoring device provided in an embodiment of this application.

[0026] Transformer current monitoring device such as Figure 2 As shown:

[0027] 1) Hardware configuration: Select Rogowski coil with a range of 0-100mA, signal processing components and microprocessor; select analog pointer meter with an accuracy of ±0.5% and alarm components for the ammeter.

[0028] 2) Alarm setting: The alarm value can be set to 50mA (default value) via the buttons on the device panel. When the limit is exceeded, the red indicator light will light up and the wireless alarm signal will be triggered.

[0029] 3) Installation method: Connect the Rogowski coil to the transformer core grounding wire, fix the device body to the side wall of the transformer tank, and face the maintenance passage with the indicator light and ammeter facing the maintenance passage.

[0030] like Figure 1 As shown, the current monitoring device 10 for the transformer includes: a data acquisition component 100, a control component 200, and an alarm component 300.

[0031] The acquisition component 100 is non-contactly installed on the grounding wire of the transformer core and clamps to acquire the first current signal of the transformer core and the second current signal of the clamps. The control component 200 is connected to the acquisition component 100 and is used to monitor whether there is leakage current in the transformer core and the clamps based on the first and second current signals. When there is leakage current in the transformer core and / or the clamps, the control component 200 sends an alarm signal to the alarm component 300. The alarm component 300 is connected to the control component 200 and is used to provide acoustic and / or optical alarm reminders after receiving the alarm signal from the control component 200.

[0032] In some embodiments, the acquisition component 100 is a Rogowski coil sensor.

[0033] Rogowski coil sensor: Non-contact installation on the transformer core or clamp grounding wire, such as... Figure 2 As shown, the control component 200, also known as the microprocessor mentioned above, is used to collect leakage current signals in real time and convert them into voltage signals for output. It is used to monitor whether there is leakage current in the transformer core and whether there is leakage current in the clamps, calculate the leakage current values ​​of the transformer core and clamps, and send an alarm signal to the alarm component 300 when there is leakage current in the transformer core and / or the clamps.

[0034] Optionally, in some embodiments, the transformer current monitoring device 10 described above includes: a signal processing component, which is connected to the acquisition component 100 and the control component 200 respectively, for processing the first current signal and the second current signal output by the acquisition component 100, and sending the processed first current signal and the second current signal to the control component 200, so as to monitor whether there is leakage current in the transformer core or whether there is leakage current in the clamping parts through the control component 200.

[0035] Optionally, in some embodiments, the signal processing component includes: a filtering unit connected to the acquisition component 100, which filters the first current signal and the second current signal output by the acquisition component 100; an amplification unit connected to the filtering unit, which amplifies the filtered first current signal and the second current signal; and a digital-to-analog conversion unit connected to the amplified first current signal and the second current signal, which performs analog-to-digital conversion on the amplified first current signal and the second current signal to obtain the current value of the transformer core and the current value of the clamp, respectively, and sends them to the control component 200.

[0036] like Figure 3 As shown, the signal processing component performs filtering, amplification, and ADC conversion on the output first and second current signals.

[0037] Specifically, the filtering unit is connected to the acquisition component 100. When the first current signal and the second current signal enter the filtering unit, the filtering unit uses a suitable filtering circuit (such as a low-pass filter, band-pass filter, etc., selected according to the signal characteristics and noise frequency distribution) to process the signal. Its function is to remove high-frequency noise and interference components from the signal and retain useful low-frequency signal components.

[0038] The amplification unit is connected to the filtering unit. Even after filtering, the first and second current signals may still be relatively weak and insufficient for direct analog-to-digital conversion. The amplification unit uses operational amplifiers and other circuits to amplify these two signals. The amplification factor is appropriately set based on the initial amplitude of the signals and the requirements of the subsequent analog-to-digital conversion unit. After amplification, the amplitudes of the first and second current signals reach a level suitable for analog-to-digital conversion, while ensuring the accuracy and integrity of the signals.

[0039] The analog-to-digital converter (ADC) is connected to the amplification unit. The amplified first and second current signals enter the ADC. The ADC contains a high-precision analog-to-digital converter (ADC), which converts the continuous analog current signal into a discrete digital signal. During the conversion process, the ADC samples the analog signal at a certain sampling frequency, converting the signal amplitude of each sampling point into a corresponding digital code. After the analog-to-digital conversion, the first current signal corresponds to the current value of the transformer core, and the second current signal corresponds to the current value of the clamping component. These digital current values ​​are sent to the control component 200 by the ADC.

[0040] After processing the first current signal and the second current signal output by the acquisition component 100, the signal processing component sends the processed first current signal and the second current signal to the control component 200 so that the control component 200 can monitor whether there is leakage current in the transformer core or whether there is leakage current in the clamping parts.

[0041] Optionally, in some embodiments, the control component 200 further includes: a human-machine interface for receiving alarm thresholds set by the user; and a detection unit for detecting whether the current value of the transformer core is greater than the alarm threshold and whether the current value of the detection clamp is greater than the alarm threshold, and issuing an alarm signal when the current value of the transformer core is greater than the alarm threshold and / or the current value of the detection clamp is greater than the alarm threshold.

[0042] After receiving the alarm threshold input by the user, the human-machine interface converts the data into a digital signal format recognizable by the control component 200, and transmits it to the main control unit of the control component 200 via an internal communication bus (such as I2C, SPI, or CAN bus). The alarm threshold can also be dynamically set via the communication interface.

[0043] The alarm threshold data that passes the verification will be stored in the non-volatile memory (such as EEPROM or Flash) of the control component 200 to ensure that the alarm threshold settings are not lost after the system is powered off or restarted, and the system can continue to monitor according to the user-set thresholds.

[0044] The detection unit monitors the current values ​​of the transformer core and clamps in real time and compares the results with the alarm thresholds set by the user. When the current value of the transformer core exceeds the alarm threshold, and / or the current value of the clamps exceeds the alarm threshold, the detection unit will immediately issue an alarm signal to notify relevant personnel to take measures to prevent transformer failures caused by abnormal current in the core or clamps.

[0045] The alarm threshold can be flexibly set according to the transformer model and environmental conditions to adapt to the needs of multiple scenarios.

[0046] Optionally, in some embodiments, the transformer current monitoring device 10 described above further includes: a display component connected to the processing component, used to display the current value of the transformer core and the current value of the clamp.

[0047] In this embodiment, the display component is a pointer-type high-precision ammeter, used to display the current value of the transformer core and the clamping parts, as well as the leakage current value in real time. The range is adjustable and the accuracy is not less than ±1%.

[0048] Optionally, in some embodiments, the alarm component 300 further includes: an acoustic alarm unit connected to the control component 200, used to provide an acoustic alarm reminder after receiving an alarm signal sent by the control component 200; and / or an optical alarm unit connected to the control component 200, used to provide an optical alarm reminder after receiving an alarm signal sent by the control component 200.

[0049] The acoustic alarm unit is closely connected to the control component 200 and is a key part of the alarm component that transmits warning information through sound. After receiving the alarm signal sent by the control component 200, the acoustic alarm unit will provide an acoustic alarm reminder. The acoustic alarm unit can be a buzzer in the vehicle.

[0050] In practical applications, optical alarm units can take many forms. For example, common ones include flashing lights or constantly lit warning lights.

[0051] Taking the status indicator light as an example, it adopts a dual-color LED design, where green indicates normal operation and red indicates an over-limit alarm. During normal system operation, that is, when the current values ​​of the transformer core and the clamps are not greater than the alarm threshold, the status indicator light displays green, providing operators with intuitive feedback on normal operation. However, when the system experiences abnormal conditions such as over-limit situations, that is, when the current value of the transformer core exceeds the alarm threshold, and / or the current value of the clamps exceeds the alarm threshold, the status indicator light will turn red. The alarm status can be further emphasized by flashing red or remaining constantly lit. Figure 4 As shown.

[0052] Optionally, in some embodiments, the transformer current monitoring device 10 described above further includes: a power supply component for powering the device for monitoring the current of the transformer core and clamps. The power supply component includes a first power supply and a second power supply, for switching to the second power supply for power supply when the first power supply fails, or switching to the first power supply for power supply when the second power supply fails.

[0053] This application employs a dual-power automatic transfer switch or hardware circuit control. When the voltage of the first power supply is abnormal (overvoltage / undervoltage / power failure), it automatically switches to the second power supply. The switching time can be controlled in milliseconds to avoid monitoring interruption. The power supply component supports AC and DC dual input.

[0054] The primary and secondary power supplies are online simultaneously, with the backup power supply monitoring the status of the primary power supply in real time. In case of failure, the backup power supply switches over with zero delay. The primary power supply handles the normal load, while the backup power supply only starts during switching to avoid overload risks.

[0055] Optionally, in some embodiments, the transformer current monitoring device 10 described above further includes: a communication component, which is connected to the control component 200, and is used to send alarm signals sent by the control component 200 to a remote monitoring platform.

[0056] The communication component serves as a crucial bridge connecting the local control component 200 and the remote monitoring platform, accurately and promptly transmitting the alarm signals generated by the control component 200 to the remote monitoring platform.

[0057] When the control component 200 detects an abnormal transformer current and triggers a local light alarm, it immediately generates a corresponding alarm signal and sends it to the communication component. Upon receiving the signal, the communication component transmits the alarm signal to the remote monitoring platform via a network (such as Ethernet or a wireless communication network) according to a preset communication protocol and parameters. Upon receiving the alarm signal, the remote monitoring platform analyzes and processes it, issuing alerts to relevant management or maintenance personnel in a visual manner (such as by popping up an alarm window, sending SMS or email notifications).

[0058] The transformer current monitoring device proposed in this application uses a data acquisition component to acquire a first current signal from the transformer core and a second current signal from the clamping components. A control component monitors whether leakage current exists in the transformer core and clamping components based on the first and second current signals. When leakage current exists in the transformer core and / or clamping components, an alarm signal is sent to an alarm component. Upon receiving the alarm signal from the control component, the alarm component provides an acoustic and / or optical alarm. This solves the problems of insufficient monitoring accuracy, simple and low-integration alarm mechanisms, difficulty in intuitively displaying real-time current values, and inability to adapt to different operating conditions in existing power equipment monitoring methods. It achieves real-time monitoring, visual display, and intelligent alarm of leakage current in the transformer core and clamping components, improving equipment safety and maintenance efficiency.

[0059] Next, with reference to the accompanying drawings, a transformer current monitoring method according to an embodiment of this application is described.

[0060] Figure 5 This is a schematic diagram of a transformer current monitoring method according to an embodiment of this application.

[0061] The transformer current monitoring method uses the aforementioned transformer current monitoring device, and the method includes the following steps:

[0062] In step S501, the first current signal of the transformer core and the second current signal of the clamp are acquired.

[0063] In step S502, the presence of leakage current in the transformer core and the clamps is monitored based on the first current signal and the second current signal, and an acoustic alarm and / or optical alarm are sent when leakage current is present in the transformer core and / or the clamps.

[0064] It should be noted that the foregoing explanation of the embodiment of the transformer current monitoring device also applies to the transformer current monitoring method of this embodiment, and will not be repeated here.

[0065] The transformer current monitoring method proposed in this application collects a first current signal from the transformer core and a second current signal from the clamping components. Based on the first and second current signals, it monitors whether leakage current exists in the transformer core and clamping components, and sends acoustic and / or optical alarms when leakage current is detected in the transformer core and / or clamping components. This solves the problems of insufficient monitoring accuracy, simple and low-integration alarm mechanisms, difficulty in intuitively displaying real-time current values, and inability to adapt to different operating conditions in existing power equipment monitoring methods. It achieves real-time monitoring, visual display, and intelligent alarm of leakage current in the transformer core and clamping components, improving equipment safety and operation and maintenance efficiency.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0069] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be specifically implemented in any computer program product for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer program product" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer program products include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic device, and portable optical disc read-only memory (CDROM). Furthermore, the computer program product can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0070] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0071] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer program product, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0072] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer program product.

[0073] The computer program product mentioned above may be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A current monitoring device for a transformer, characterized in that, include: The components include data acquisition, control, and alarm components. The acquisition component is non-contactly installed on the grounding wire of the transformer core and clamps, and is used to acquire the first current signal of the transformer core and the second current signal of the clamps. The control component is connected to the acquisition component and is used to monitor whether there is leakage current in the transformer core and whether there is leakage current in the clamping component based on the first current signal and the second current signal. When there is leakage current in the transformer core and / or leakage current in the clamping component, an alarm signal is sent to the control alarm component. The alarm component, which is connected to the control component, is used to provide acoustic and / or optical alarm alerts upon receiving an alarm signal from the control component.

2. The apparatus according to claim 1, characterized in that, include: A signal processing component is connected to both the acquisition component and the control component. It processes the first current signal and the second current signal output by the acquisition component and sends the processed first current signal and second current signal to the control component so that the control component can monitor whether there is leakage current in the transformer core or the clamp.

3. The apparatus according to claim 2, characterized in that, The signal processing component includes: A filtering unit, connected to the acquisition component, performs filtering processing on the first current signal and the second current signal output by the acquisition component; An amplification unit, connected to the filtering unit, is used to amplify the filtered first current signal and the second current signal. The analog-to-digital conversion unit, connected to the amplification unit, performs analog-to-digital conversion processing on the amplified first current signal and the second current signal to obtain the current value of the transformer core and the current value of the clamp, respectively, and sends them to the control component.

4. The apparatus according to claim 3, characterized in that, Also includes: A display component, connected to the processing component, is used to display the current value of the transformer core and the current value of the clamp.

5. The apparatus according to claim 1, characterized in that, The control component further includes: The human-computer interaction interface is used to receive alarm thresholds set by the user; The detection unit is used to detect whether the current value of the transformer core is greater than the alarm threshold and whether the current value of the clamp is greater than the alarm threshold, and to issue an alarm signal when the current value of the transformer core is greater than the alarm threshold and / or the current value of the clamp is greater than the alarm threshold.

6. The apparatus according to claim 5, characterized in that, The alarm component also includes: An acoustic alarm unit is connected to the control component and is used to provide an acoustic alarm reminder after receiving an alarm signal sent by the control component. And / or, an optical alarm unit, which is connected to the control component and is used to provide an optical alarm reminder after receiving an alarm signal sent by the control component.

7. The apparatus according to claim 1, characterized in that, Also includes: A power supply assembly is used to supply power to a device for monitoring the current of transformer core and clamps. The power supply assembly includes a first power supply and a second power supply, and is used to switch the second power supply to supply power when the first power supply fails, or to switch the first power supply to supply power when the second power supply fails.

8. The apparatus according to claim 5, characterized in that, Also includes: A communication component is connected to the control component and is used to send alarm signals sent by the control component to a remote monitoring platform.

9. The apparatus according to claim 1, characterized in that, The acquisition component is a Rogowski coil sensor.

10. A method for monitoring the current of a transformer, characterized in that, The transformer current monitoring device according to any one of claims 1-9, wherein the method includes: The first current signal of the transformer core and the second current signal of the clamp are acquired. The system monitors whether there is leakage current in the transformer core and the clamping component based on the first current signal and the second current signal, and sends an acoustic alarm and / or optical alarm when there is leakage current in the transformer core and / or the clamping component.

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