Shielding encapsulation method for magnetic field measurement on GIS busbar enclosure and related apparatus

Abstract

A shielding encapsulation method for magnetic field measurement on a GIS busbar enclosure and a related apparatus, relating to the technical field of power system detection. A magnetic shielding coil is arranged on the GIS bus enclosure, and the magnetic shielding coil is connected to an output end of a differential amplifier. In the present invention, circulating current of a GIS busbar jumper bar and busbar conductor current are acquired, and a difference between the circulating current and the conductor current is calculated; the difference is amplified by means of a differential amplifier, a drive signal of a corresponding intensity is generated, and the drive signal is sent to the magnetic shielding coil; an ambient noise level outside the magnetic shielding coil is measured; and the ambient noise level is monitored in real time and the intensity of the drive signal is dynamically adjusted on the basis of a magnitude of variation of the ambient noise level. The present invention can realize directional gating of internal defects and active suppression of external interference magnetic fields. In addition, the shielding effectiveness is dynamically adjusted by means of a self-calibration method to adapt to different detection environments, thereby helping to ensure safe and stable operation of a power system.

Description

A method and related device for shielding and encapsulating magnetic field measurement of GIS busbar casing

[0001] This application claims priority to Chinese Patent Application No. 202510279731.2, filed on March 11, 2025, entitled "A GIS Busbar Shell Magnetic Field Measurement Shielding Encapsulation Method and Related Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention belongs to the field of power system testing technology, specifically relating to a method and related device for shielding and encapsulating the magnetic field measurement of a GIS busbar casing with self-calibration function. Background Technology

[0003] With the rapid development of power systems and the continuous expansion of power grids, the safety and reliability of high-voltage switchgear are crucial to the stable operation of power systems. Gas-Insulated Switchgear (GIS), as an advanced high-voltage electrical device, is widely used in power systems due to its advantages such as small footprint, high reliability, and convenient maintenance. The GIS busbar, as the core component of GIS equipment, undertakes the function of transmitting and distributing high-voltage current. If internal defects (such as partial discharge and insulation aging) are not detected and addressed in a timely manner, they may lead to equipment failure or even accidents, causing huge economic losses and safety hazards.

[0004] In the operation and maintenance of GIS busbars, magnetic field detection is an important method, enabling the timely detection of potential internal defects by monitoring changes in the magnetic field. Traditional GIS busbar magnetic field measurement technology mainly relies on external magnetic field sensors to directly measure the magnetic field. While this method is simple, it has many limitations in practical applications. For example, the internal structure of GIS busbars is complex, making it difficult for external sensors to accurately capture the weak magnetic field signals generated by internal defects. Furthermore, magnetic field interference from the external environment (such as the Earth's magnetic field and magnetic fields generated by nearby equipment) can significantly affect the measurement results, leading to misjudgments. In addition, traditional measurement techniques lack self-calibration capabilities, failing to dynamically adjust measurement parameters to adapt to different detection environments, thus limiting their application in complex environments.

[0005] Although researchers have proposed various improvement measures, such as using high-performance magnetic field sensors, optimizing measurement layout, and applying signal processing techniques, these methods often require complex hardware configurations and specialized operators, and still struggle to completely eliminate the influence of external interference in practical applications. Therefore, improving the accuracy and reliability of GIS busbar magnetic field detection while reducing the impact of external interference has become a pressing technical problem to be solved. Summary of the Invention

[0006] In view of this, the present invention aims to provide a shielding and encapsulation method and related device for measuring the magnetic field of a GIS busbar enclosure with self-calibration function. This method can achieve directional gating of the internal defect magnetic field and active suppression of the external interference magnetic field, and has a self-calibration function to adapt to different detection environments and improve the efficiency and accuracy of GIS busbar magnetic field detection.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0008] In a first aspect, the present invention provides a shielding and encapsulation method for measuring the magnetic field of a GIS busbar enclosure. A magnetic shielding coil is arranged on the GIS busbar enclosure, and the magnetic shielding coil is connected to the output terminal of a differential amplifier. The method includes the following steps:

[0009] Obtain the circulating current and bus conductor current of the GIS busbar jumper and calculate the difference between the circulating current and the conductor current;

[0010] The difference is amplified by a differential amplifier to generate a driving signal of corresponding strength and send it into the magnetic shielding coil so that the magnetic shielding coil generates a magnetic field opposite to the direction of the external interference magnetic field to cancel the external interference magnetic field.

[0011] Measure the ambient noise level outside the magnetically shielded coil;

[0012] The system monitors the ambient noise level in real time and dynamically adjusts the strength of the drive signal according to the changes in the ambient noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

[0013] Furthermore, the circulating current and bus conductor current of the GIS busbar jumper are obtained, including:

[0014] A current transformer measuring coil is installed at the GIS busbar jumper. The current transformer measuring coil senses the change in the magnetic field in the GIS busbar and converts it into a corresponding current signal to obtain the circulating current.

[0015] Current transformers are installed at the internal conductor rods of the GIS busbar, and the conductor current is obtained by reading the current transformers.

[0016] Furthermore, the ambient noise level outside the magnetically shielded coil is measured, including:

[0017] A magnetic field sensor is placed outside the magnetic shielding coil to monitor external background magnetic field interference in real time. The background magnetic field interference includes the Earth's magnetic field, the magnetic field generated by nearby equipment, and the magnetic field generated by other external electromagnetic sources.

[0018] Furthermore, the strength of the drive signal is dynamically adjusted according to the magnitude of changes in the ambient noise level, including:

[0019] Obtain the noise floor value of the magnetic field sensor and use the noise floor value as a given quantity;

[0020] Based on the variation of the noise floor value and the ambient noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the strength of the drive signal to adapt to different detection environments.

[0021] Secondly, the present invention provides a shielding and encapsulation device for measuring the magnetic field of a GIS busbar casing, comprising:

[0022] Magnetic shielding module, differential amplifier module, data acquisition module, magnetic field measurement module, and closed-loop control module;

[0023] The magnetic shielding module is equipped with a magnetic shielding coil, which is arranged on the outer shell of the GIS busbar.

[0024] The differential amplifier module is equipped with a differential amplifier, and the output of the differential amplifier is connected to the magnetic shielding coil;

[0025] The data acquisition module is used to acquire the circulating current and conductor current of the GIS busbar jumper and to calculate the difference between the circulating current and the conductor current.

[0026] The differential amplifier module is used to amplify the difference through a differential amplifier, generate a drive signal of corresponding strength and send it into the magnetic shielding coil so that the magnetic shielding coil generates a magnetic field opposite to the direction of the external interference magnetic field, so as to cancel the external interference magnetic field.

[0027] The magnetic field measurement module is used to measure the ambient noise level outside the magnetically shielded coil;

[0028] The closed-loop control module is used to monitor the ambient noise level in real time and dynamically adjust the strength of the drive signal according to the change in the ambient noise level, so as to keep the magnetic shielding coil at its best shielding effectiveness.

[0029] Furthermore, the data acquisition module includes a current transformer measurement coil and a current transformer, including:

[0030] The current transformer measuring coil is arranged at the GIS busbar jumper to sense changes in the magnetic field in the GIS busbar and convert them into corresponding current signals to obtain circulating current.

[0031] Current transformers are installed inside the conductor rods of the GIS busbar to obtain conductor current.

[0032] Furthermore, the magnetic field measurement module includes a magnetic field sensor, which is used to monitor external background magnetic field interference in real time. The background magnetic field interference includes the Earth's magnetic field, the magnetic field generated by nearby equipment, and the magnetic field generated by other external electromagnetic sources.

[0033] Furthermore, in the closed-loop control module, the strength of the drive signal is dynamically adjusted according to the change in the ambient noise level, including:

[0034] Obtain the noise floor value of the magnetic field sensor and use the noise floor value as a given quantity;

[0035] Based on the variation of the noise floor value and the ambient noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the strength of the drive signal to adapt to different detection environments.

[0036] Thirdly, the present invention provides a computer device, the device including a processor and a memory:

[0037] The memory is used to store computer programs and send the instructions of the computer programs to the processor;

[0038] The processor executes, according to the instructions of the computer program, a method for shielding and encapsulating magnetic field measurement of a GIS busbar enclosure, as described in the first aspect.

[0039] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements a GIS busbar enclosure magnetic field measurement shielding and encapsulation method as described in the first aspect.

[0040] In summary, this invention provides a shielding and encapsulation method for measuring the magnetic field of a GIS busbar enclosure. A magnetic shielding coil is arranged on the GIS busbar enclosure and connected to the output of a differential amplifier. The method includes acquiring the circulating current of the GIS busbar jumper and the current of the busbar conductors, and calculating the difference between the circulating current and the conductor current; amplifying the difference using a differential amplifier to generate a drive signal of appropriate strength, which is then fed into the magnetic shielding coil. This allows the magnetic shielding coil to generate a magnetic field opposite in direction to the external interference magnetic field, thus canceling it out; measuring the ambient noise level outside the magnetic shielding coil; and monitoring the ambient noise level in real time and dynamically adjusting the strength of the drive signal based on changes in the ambient noise level to maintain optimal shielding effectiveness. By calculating the difference between the conductor current and the circulating current of the GIS busbar and amplifying this difference signal using a differential amplifier, this invention enables the detection system to more accurately capture weak magnetic field signals generated by internal defects, thereby achieving directional gating of internal defects and active suppression of external interference magnetic fields. Simultaneously, the self-calibration method dynamically adjusts the shielding effectiveness to adapt to different detection environments, helping to improve the magnetic field detection effectiveness of GIS buses and ensuring the safe and stable operation of the power system.

[0041] The present invention also provides a GIS busbar outer shell magnetic field measurement shielding and packaging device, a computer device and a computer-readable storage medium, which have similar effects to the above methods when implemented, and will not be described in detail here. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 is a flowchart of a shielding and encapsulation method for magnetic field measurement of a GIS busbar shell provided in an embodiment of the present invention;

[0044] Figure 2 is a wiring diagram of a magnetic field measurement shielding and encapsulation device for a GIS busbar shell provided in an embodiment of the present invention.

[0045] Figure 3 is a block diagram of a computer device provided in an embodiment of the present invention.

[0046] In the attached diagram: 1-current transformer, 2-transformer measuring coil, 3-high-precision magnetic field sensor, 4-magnetic shielding coil, 5-differential circuit, 6-controllable amplifier, 7-closed-loop control system. Detailed Implementation

[0047] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0048] Referring to Figure 1, this embodiment of the invention provides a shielding and encapsulation method for measuring the magnetic field of a GIS busbar enclosure. A magnetic shielding coil is arranged on the GIS busbar enclosure, and the magnetic shielding coil is connected to the output terminal of a differential amplifier. It is understood that the magnetic shielding coil is a coil wound with wire; when current flows through it, a magnetic field is generated. The strength and direction of the generated magnetic field can be controlled by controlling the magnitude and direction of the current. A differential amplifier is an electronic amplifier capable of amplifying the difference between two input signals, and has the ability to suppress common-mode signals (such as interference signals commonly present in the environment) and amplify differential-mode signals (useful signals).

[0049] The method includes the following steps:

[0050] S1: Obtain the circulating current and bus conductor current of the GIS busbar jumper and calculate the difference between the circulating current and the conductor current.

[0051] It should be noted that jumper bars are conductor bars used to connect different parts of the GIS busbar, serving as electrical connections. Circulating current is the current induced in the jumper bars of the GIS busbar casing, while conductor current is the actual operating current flowing through the conductors inside the GIS busbar.

[0052] This step measures the circulating current of the GIS busbar jumper and the current of the busbar conductors, then subtracts these two measurements to obtain the difference. By calculating the difference, a net current signal reflecting internal defects is obtained.

[0053] S2: The difference is amplified by a differential amplifier to generate a drive signal of corresponding strength and send it into the magnetic shielding coil so that the magnetic shielding coil generates a magnetic field opposite to the direction of the external interference magnetic field to cancel the external interference magnetic field.

[0054] It should be noted that the driving signal refers to the electrical signal amplified by the differential amplifier, which is used to drive the magnetically shielded coil.

[0055] This step inputs the difference obtained in step S1 into a differential amplifier. The differential amplifier amplifies the difference signal according to its amplification characteristics, generating a drive signal whose intensity is related to the difference. This drive signal is then sent to a magnetic shielding coil. According to Ampere's law, current flowing through the coil generates a magnetic field. Since the drive signal is related to the interference, the direction of the magnetic field generated by the magnetic shielding coil is opposite to the direction of the external interference magnetic field, thus canceling each other out and achieving the purpose of shielding the external interference magnetic field.

[0056] S3: Measure the ambient noise level outside the magnetic shielding coil.

[0057] It should be noted that the ambient noise level refers to the interference intensity generated by various noise sources such as interfering magnetic fields existing outside the magnetic shielding coil.

[0058] This step measures the environment outside the magnetically shielded coil to obtain information such as the intensity of noise in the current environment. This noise may be an interfering magnetic field that is not completely shielded or other newly generated interference sources.

[0059] S4: Monitors the ambient noise level in real time and dynamically adjusts the strength of the drive signal according to the change in the ambient noise level, so as to keep the magnetic shielding coil at its best shielding effectiveness.

[0060] It should be noted that this step involves continuously measuring the ambient noise level using measuring equipment and feeding the results back to the control system in real time. The control system adjusts the strength of the drive signal according to predefined rules (such as when the noise level change exceeds a certain threshold), by increasing or decreasing the amplitude of the drive signal. The adjusted drive signal is then sent to the magnetic shielding coil, changing the magnetic field strength generated by the coil, thereby maintaining optimal shielding effectiveness to cope with constantly changing ambient noise.

[0061] This embodiment provides a shielding and encapsulation method for measuring the magnetic field of a GIS busbar enclosure. By acquiring the difference between the circulating current and conductor current of the GIS busbar, amplifying this difference signal using a differential amplifier, and driving a magnetic shielding coil to generate a reverse magnetic field to cancel out external interference magnetic fields. Simultaneously, by monitoring the ambient noise level in real time and dynamically adjusting the driving signal strength, a self-calibration function is achieved. This method not only improves the accuracy of detecting internal defect magnetic fields but also significantly enhances the system's anti-interference capability.

[0062] In one embodiment, a method for measuring circulating current and conductor current is provided. In this embodiment, acquiring the circulating current and conductor current of the GIS busbar jumper includes:

[0063] S11: A current transformer measuring coil is installed at the GIS busbar jumper. The current transformer measuring coil senses the change in the magnetic field in the GIS busbar and converts it into a corresponding current signal to obtain the circulating current.

[0064] It should be noted that a current transformer measuring coil is a measuring device made using the principle of electromagnetic induction, consisting of a wound coil. It can sense changes in the surrounding magnetic field and convert these changes into an electrical signal (usually a current signal) as an output.

[0065] This step involves placing the current transformer measuring coil at the GIS busbar jumper. The circulating current in the jumper generates a changing magnetic field around it, which passes through the current transformer measuring coil. According to the principle of electromagnetic induction, when the magnetic flux through the coil changes, an induced electromotive force is generated in the coil, resulting in an induced current. By measuring and processing this induced current, a current signal related to the circulating current in the jumper can be obtained, thus acquiring information such as the magnitude and direction of the circulating current. For example, if the circulating current increases, the rate of change of magnetic flux through the current transformer measuring coil will also increase, and the induced current will increase accordingly. By measuring the magnitude of the induced current, the magnitude of the circulating current can be calculated.

[0066] S12: Current transformers are installed at the internal conductor rods of the GIS busbar, and the conductor current is obtained by reading the current transformers.

[0067] It should be noted that a current transformer is an instrument specifically designed for measuring large currents. Based on the principle of electromagnetic induction, it consists of a primary winding, a secondary winding, and an iron core. The primary winding is connected in series in the circuit under test, while the secondary winding is connected to measuring instruments or protective devices. When current flows through the primary winding, an alternating magnetic field is generated in the iron core. This magnetic field induces a corresponding current in the secondary winding. By measuring the current in the secondary winding and applying the current transformer's turns ratio, the magnitude of the current in the primary winding (i.e., the circuit under test) can be calculated.

[0068] This step involves installing a current transformer at the internal conductor of the GIS busbar. The primary winding of the current transformer is connected in series in the circuit of the internal conductor, allowing the conductor current in the internal conductor to flow through the primary winding. According to the principle of electromagnetic induction, the current in the primary winding generates an alternating magnetic field in the iron core, which induces a corresponding current in the secondary winding. By reading the current value of the secondary winding using a measuring device connected to it, and based on the current transformer's turns ratio (e.g., the ratio of the number of turns in the primary winding to the number of turns in the secondary winding), the magnitude of the conductor current in the internal conductor of the GIS busbar can be calculated.

[0069] Traditional methods for measuring the magnetic field of GIS busbars mainly rely on direct measurement using external magnetic field sensors, which makes it difficult to capture weak magnetic field signals generated by internal defects. This invention, however, achieves directional targeting of the magnetic field from internal defects by measuring the circulating current in the GIS busbar jumper and the conductor current of the current transformer, and calculating their difference.

[0070] In one embodiment, a method for measuring ambient noise levels is provided. In this embodiment, measuring the ambient noise level outside a magnetically shielded coil includes:

[0071] A magnetic field sensor is placed outside the magnetic shielding coil to monitor external background magnetic field interference in real time. The background magnetic field interference includes the Earth's magnetic field, the magnetic field generated by nearby equipment, and the magnetic field generated by other external electromagnetic sources.

[0072] It should be noted that a magnetic field sensor is a device that can detect the presence of an surrounding magnetic field and convert relevant information (such as magnetic field strength and direction) into measurable electrical signals (such as voltage and current). The geomagnetic field, which is part of the background magnetic field interference, is the Earth's own magnetic field, a global magnetic field whose strength and direction vary across different geographical locations and times. The geomagnetic field is a naturally occurring source of magnetic field interference and may affect applications such as high-precision magnetic field measurements. Magnetic fields generated by nearby equipment refer to the environment surrounding the GIS busbar, where other electrical and mechanical equipment may exist. These devices generate magnetic fields during operation; for example, motors and transformers produce strong magnetic fields that may interfere with the operation of the magnetic shielding coil and related magnetic field measurements. Magnetic fields generated by other external electromagnetic sources refer to various other electromagnetic sources, such as wireless communication equipment and electromagnetic radiation from lightning activity. This electromagnetic radiation can also create magnetic field interference, affecting the magnetic field environment outside the magnetic shielding coil.

[0073] In one embodiment, a method for dynamically adjusting the strength of a drive signal is provided. In this embodiment, dynamically adjusting the strength of the drive signal based on changes in ambient noise levels includes:

[0074] S41: Obtain the noise floor value of the magnetic field sensor and use the noise floor value as a given quantity.

[0075] It should be noted that the noise floor value of a magnetic field sensor refers to the measured value corresponding to the noise signal generated by the sensor under the influence of internal electronic component thermal noise, circuit noise, and other factors when there is no external effective magnetic field signal input. It is the inherent noise level of the magnetic field sensor itself, reflecting the sensor's intrinsic noise characteristics. For example, a Hall sensor, in the absence of an external magnetic field, will generate a certain amount of minute electrical signal fluctuation due to the thermal motion of its internal electrons; the measured value corresponding to this fluctuation is the noise floor value. In a control system, a fixed value or reference value is preset, and the system will adjust and control accordingly based on this value. In this embodiment, the noise floor value of the magnetic field sensor is used as a setpoint, and subsequent control operations will be based on this.

[0076] The output electrical signal of the magnetic field sensor is obtained by measuring it when there is no external effective magnetic field input. Since only the sensor's own noise floor affects the signal at this time, this output signal is processed and analyzed to obtain a value that represents the sensor's noise floor level, i.e., the noise floor value. This noise floor value reflects the sensor's basic noise characteristics and is used as a reference benchmark when judging changes in environmental noise levels to distinguish noise changes truly caused by the external environment.

[0077] S42: Based on the changes in the noise floor value and the ambient noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the strength of the drive signal to adapt to different detection environments.

[0078] It should be noted that the change in ambient noise level refers to the degree of change in the intensity of the ambient noise (i.e., background magnetic field interference) outside the magnetically shielded coil at different times compared to previous times. This can be determined by calculating the difference or relative change ratio between the measured ambient noise values ​​at different times. Closed-loop control is a control method for automatic control systems. The system compares the output (here, the ambient noise level) with the setpoint (the noise floor value of the magnetic field sensor) based on the feedback information, and then adjusts the control quantity (the gain of the differential amplifier) ​​according to the comparison result to make the output as close as possible to the setpoint. In this process, the system output is continuously fed back to the input, forming a closed loop, thereby achieving dynamic adjustment of the system.

[0079] This step compares the real-time monitored ambient noise level with the previously acquired noise floor value of the magnetic field sensor to calculate the magnitude of the change in the ambient noise level. Then, based on this magnitude, a closed-loop control algorithm (such as proportional-integral-derivative control, i.e., PID control) is used to determine how the gain of the differential amplifier needs to be adjusted. For example, if the ambient noise level increases, it indicates that the external interference magnetic field is strengthening. To generate a stronger reverse magnetic field from the magnetic shielding coil to counteract the interference, the gain of the differential amplifier needs to be increased, thereby increasing the strength of the drive signal. Conversely, if the ambient noise level decreases, the gain of the differential amplifier can be appropriately reduced. By continuously monitoring the ambient noise level, comparing it with the noise floor value, and adjusting the differential amplifier gain, a closed-loop control process is formed, achieving dynamic adjustment of the drive signal strength to adapt to different detection environments. This step is the core of the self-calibration function of this invention; it allows the system to automatically adjust the shielding effectiveness based on the actually measured noise floor value and external interference to adapt to different detection environments and conditions.

[0080] Based on the variation in noise floor and ambient noise levels, the gain of the differential amplifier is dynamically adjusted using a closed-loop control method, thereby changing the strength of the drive signal. This allows the magnetically shielded coil to adjust the generated magnetic field strength in real time according to changes in external ambient noise. This ensures that the magnetically shielded coil maintains optimal shielding effectiveness under various environmental interference conditions, effectively counteracting external interference magnetic fields, improving the accuracy and reliability of GIS bus magnetic field measurements, and enhancing the overall system's adaptability to different detection environments.

[0081] Based on the same inventive concept, this application also provides a GIS busbar enclosure magnetic field measurement shielding and packaging device for implementing the above-mentioned method for shielding and packaging magnetic field measurement of a GIS busbar enclosure. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of the following embodiment of the GIS busbar enclosure magnetic field measurement shielding and packaging device can be found in the above-described limitations of the GIS busbar enclosure magnetic field measurement shielding and packaging method, and will not be repeated here.

[0082] Please refer to Figure 2. An embodiment of the present invention provides a magnetic field measurement shielding and packaging device for a GIS busbar shell, including a magnetic shielding module, a differential amplification module, a data acquisition module, a magnetic field measurement module, and a closed-loop control module.

[0083] The magnetic shielding module is equipped with a magnetic shielding coil 4, which is arranged on the outer shell of the GIS busbar.

[0084] The differential amplifier module is equipped with a differential amplifier (composed of a differential circuit 5 and a controllable amplifier 6), and the output terminal of the differential amplifier is connected to the magnetic shielding coil 4.

[0085] The data acquisition module is used to acquire the circulating current and conductor current of the GIS busbar jumper and to calculate the difference between the circulating current and the conductor current.

[0086] The differential amplifier module is used to amplify the difference through a differential amplifier, generate a drive signal of corresponding strength and send it into the magnetic shielding coil so that the magnetic shielding coil generates a magnetic field opposite to the direction of the external interference magnetic field, so as to cancel the external interference magnetic field.

[0087] The magnetic field measurement module is used to measure the ambient noise level outside the magnetically shielded coil;

[0088] The closed-loop control module is used to monitor the ambient noise level in real time and dynamically adjust the strength of the drive signal according to the change in the ambient noise level, so as to keep the magnetic shielding coil at its best shielding effectiveness.

[0089] According to Faraday's law of electromagnetic induction, when a conductor moves in a magnetic field or the magnetic field changes around the conductor, an induced electromotive force (i.e., circulating current) is generated in the conductor. Defects inside the GIS busbar, such as partial discharge or insulation aging, will generate specific magnetic field changes around the busbar. These changes can be detected by the current transformer's measuring coil. By measuring the conductor current of the GIS busbar and the circulating current caused by internal defects, and then differentiating these two current values, a net current signal reflecting the internal defects can be obtained. This differential signal effectively highlights the magnetic field changes caused by internal defects while reducing interference caused by changes in the external environment. A magnetic shielding coil is used to generate a magnetic field opposite to the external interfering magnetic field to achieve magnetic field cancellation. This active shielding technology can significantly reduce the influence of external magnetic fields on the measurement of the internal magnetic field of the GIS busbar.

[0090] By monitoring the noise floor of the magnetic field sensor in real time and using it as a setpoint, the system can dynamically adjust the gain of the differential amplifier. This self-calibration function enables the system to adapt to different environmental conditions, ensuring the accuracy and reliability of the measurement signal. The system employs a closed-loop control mechanism, adjusting the effectiveness of the magnetic shielding coil based on the real-time output of the magnetic field sensor. This mechanism ensures that the system can respond quickly to changes in external magnetic field interference, maintaining optimal shielding performance.

[0091] Furthermore, the data acquisition module includes a current transformer measuring coil 2 and a current transformer 1, comprising:

[0092] The current transformer measuring coil 2 is arranged at the GIS busbar jumper to sense the magnetic field change in the GIS busbar and convert it into a corresponding current signal to obtain the circulating current.

[0093] Current transformer 1 is located inside the conductor rod of the GIS busbar and is used to obtain conductor current.

[0094] Furthermore, the magnetic field measurement module includes a high-precision magnetic field sensor 3, which is used to monitor external background magnetic field interference in real time. The background magnetic field interference includes the geomagnetic field, the magnetic field generated by nearby equipment, and the magnetic field generated by other external electromagnetic sources.

[0095] Furthermore, in the closed-loop control module, the strength of the drive signal is dynamically adjusted according to the change in the ambient noise level, including:

[0096] Obtain the noise floor value of the magnetic field sensor and use the noise floor value as a given quantity;

[0097] Based on the variation of the noise floor value and the ambient noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method (preset closed-loop control system 7), thereby changing the strength of the drive signal to adapt to different detection environments.

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the system 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 embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0099] Referring to Figure 3, an embodiment of the present invention also provides a computer device, including: a memory and a processor, and a computer program stored in the memory. When the computer program is executed on the processor, it implements a GIS busbar enclosure magnetic field measurement shielding and encapsulation method as described in any of the above methods.

[0100] The computer device may be a desktop computer, laptop, handheld computer, or cloud server, etc. This computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that Figure 3 is merely an example of a computer device and does not constitute a limitation on the computer device. It may include more or fewer components than shown, or combine certain components, or different components, such as input / output devices, network access devices, etc.

[0101] The processor referred to can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0102] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard drive or RAM. In other embodiments, the memory may be an external storage device of the computer device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory may include both internal and external storage units of the computer device. The memory is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory can also be used to temporarily store data that has been output or will be output.

[0103] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a GIS busbar outer shell magnetic field measurement shielding and encapsulation method as described in any of the above methods.

[0104] In this embodiment, if the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0105] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0106] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0107] In the embodiments disclosed in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0108] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of magnetic field measurement shielded encapsulation of a GIS bus enclosure, characterized by, A magnetic shielding coil is arranged on the outer shell of the GIS busbar, and the magnetic shielding coil is connected to the output terminal of the differential amplifier, including the following steps: Obtain the circulating current and bus conductor current of the GIS busbar jumper and calculate the difference between the circulating current and the conductor current; The difference is amplified by the differential amplifier to generate a driving signal of corresponding strength and sent to the magnetic shielding coil so that the magnetic shielding coil generates a magnetic field opposite to the direction of the external interference magnetic field to cancel the external interference magnetic field. Measure the ambient noise level outside the magnetic shielding coil; The ambient noise level is monitored in real time, and the strength of the driving signal is dynamically adjusted according to the change in the ambient noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

2. The GIS bus enclosure magnetic field measurement shielded packaging method of claim 1, wherein, Obtain the circulating current and bus conductor current of the GIS busbar jumper, including: A current transformer measuring coil is arranged at the GIS busbar jumper. The current transformer measuring coil senses the magnetic field change in the GIS busbar and converts it into a corresponding current signal to obtain the circulating current. A current transformer is installed at the internal conductor rod of the GIS busbar, and the conductor current is obtained by reading the current transformer.

3. The method of magnetic field measurement shielding encapsulation of a GIS bus enclosure of claim 1, wherein, Measuring the ambient noise level outside the magnetic shielding coil includes: A magnetic field sensor is arranged outside the magnetic shielding coil to monitor external background magnetic field interference in real time. The background magnetic field interference includes the Earth's magnetic field, the magnetic field generated by nearby equipment, and the magnetic field generated by other external electromagnetic sources.

4. The method of magnetic field measurement shielding encapsulation of a GIS bus enclosure of claim 3, wherein, Dynamically adjusting the strength of the drive signal based on the change in the ambient noise level, including: Obtain the noise floor value of the magnetic field sensor and use the noise floor value as a given quantity; Based on the changes in the noise floor value and the ambient noise level, the gain of the differential amplifier is dynamically adjusted using a closed-loop control method, thereby changing the intensity of the driving signal to adapt to different detection environments.

5. A GIS busbar enclosure magnetic field measurement shielded packaging device, characterized by, include: Magnetic shielding module, differential amplifier module, data acquisition module, magnetic field measurement module, and closed-loop control module; The magnetic shielding module is equipped with a magnetic shielding coil, which is arranged on the outer shell of the GIS busbar. The differential amplifier module is equipped with a differential amplifier, and the output terminal of the differential amplifier is connected to the magnetic shielding coil. The data acquisition module is used to acquire the circulating current and bus conductor current of the GIS busbar jumper and to calculate the difference between the circulating current and the conductor current. The differential amplifier module is used to amplify the difference through the differential amplifier, generate a driving signal of corresponding strength and send it into the magnetic shielding coil, so that the magnetic shielding coil generates a magnetic field opposite to the direction of the external interference magnetic field, so as to cancel the external interference magnetic field. The magnetic field measurement module is used to measure the ambient noise level outside the magnetic shielding coil; The closed-loop control module is used to monitor the ambient noise level in real time and dynamically adjust the strength of the drive signal according to the change in the ambient noise level, so as to keep the magnetic shielding coil at its best shielding effectiveness.

6. The GIS busbar outer casing magnetic field measurement shielding and encapsulation device according to claim 5, characterized in that, The data acquisition module includes a current transformer measurement coil and a current transformer, comprising: The current transformer measuring coil is arranged at the GIS busbar jumper to sense changes in the magnetic field in the GIS busbar and convert them into corresponding current signals to obtain the circulating current. The current transformer is arranged at the internal guide rod of the GIS busbar and is used to obtain the conductor current.

7. The GIS busbar outer casing magnetic field measurement shielding and encapsulation device according to claim 5, characterized in that, The magnetic field measurement module includes a magnetic field sensor, which is used to monitor external background magnetic field interference in real time. The background magnetic field interference includes the Earth's magnetic field, the magnetic field generated by nearby equipment, and the magnetic field generated by other external electromagnetic sources.

8. The GIS busbar outer casing magnetic field measurement shielding and encapsulation device according to claim 7, characterized in that, In the closed-loop control module, the strength of the drive signal is dynamically adjusted according to the change in the ambient noise level, including: Obtain the noise floor value of the magnetic field sensor and use the noise floor value as a given quantity; Based on the changes in the noise floor value and the ambient noise level, the gain of the differential amplifier is dynamically adjusted using a closed-loop control method, thereby changing the strength of the driving signal to adapt to different detection environments.

9. A computer device, comprising: The device includes a processor and a memory: The memory is used to store computer programs and send the instructions of the computer programs to the processor; The processor executes, according to the instructions of the computer program, a method for shielding and encapsulating magnetic field measurement of a GIS busbar enclosure as described in any one of claims 1-4.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements a GIS busbar enclosure magnetic field measurement shielding and encapsulation method as described in any one of claims 1-4.

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