A GIS busbar housing magnetic field measurement shielding packaging method and related device

Abstract

The present invention provides a GIS busbar housing magnetic field measurement shielding packaging method and related devices, belonging to the field of power system detection technology, wherein a magnetic shielding coil is arranged on the GIS busbar housing, and the magnetic shielding coil is connected to the output end of a differential amplifier. The present invention obtains the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculates the difference between the circulating current and the conductor current; uses a differential amplifier to amplify the difference, generates a driving signal of corresponding strength and sends it to the magnetic shielding coil; measures the environmental noise level outside the magnetic shielding coil; monitors the environmental noise level in real time and dynamically adjusts the intensity of the driving signal according to the change amplitude of the environmental noise level. The present invention can realize directional gating of internal defects and active suppression of external interference magnetic fields; at the same time, dynamically adjusts and adjusts the shielding effectiveness through a self-calibration method to adapt to different detection environments, which helps to ensure the safe and stable operation of the power system.

Description

Technical Field

[0001] The invention belongs to the technical field of power system detection, and in particular relates to a GIS busbar housing magnetic field measurement shielding packaging method with a self-calibration function and a related device. Background Art

[0002] 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. GIS (Gas Insulated Switchgear), as an advanced high-voltage electrical equipment, has been widely used in power systems due to its advantages such as small footprint, high reliability, and easy maintenance. As the core component of GIS equipment, GIS busbar is responsible for the transmission and distribution of high-voltage current. If its internal defects (such as partial discharge, insulation aging, etc.) are not discovered and handled in time, it may cause equipment failure or even accidents, resulting in huge economic losses and safety hazards.

[0003] In the operation and maintenance of GIS busbars, magnetic field detection is an important means to detect potential internal defects in a timely manner by detecting 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. Although this method is simple, it has many limitations in practical applications. For example, the internal structure of the GIS busbar is complex, and it is difficult for external sensors to accurately capture the weak magnetic field signals generated by internal defects; at the same time, magnetic field interference from the external environment (such as the geomagnetic field, the magnetic field generated by neighboring equipment, etc.) will have a significant impact on the measurement results, leading to misjudgment. In addition, traditional measurement technology lacks self-calibration function and cannot dynamically adjust measurement parameters to adapt to different detection environments, which limits its application capabilities in complex environments.

[0004] Although researchers have proposed a variety of improvement measures, such as using high-performance magnetic field sensors, optimizing measurement layout, and applying signal processing technology, these methods often require complex hardware configuration and professional operators, and it is still difficult to completely eliminate the influence of external interference in practical applications. Therefore, how to improve the accuracy and reliability of GIS busbar magnetic field detection while reducing the influence of external interference has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention aims to provide a GIS busbar casing magnetic field measurement shielding packaging method and related devices with a self-calibration function, which can achieve directional gating of internal defect magnetic fields and active suppression of external interference magnetic fields, and has a self-calibration function to adapt to different detection environments and improve the efficiency and accuracy of GIS busbar magnetic field detection.

[0006] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0007] In a first aspect, the present invention provides a GIS busbar housing magnetic field measurement shielding packaging method, wherein a magnetic shielding coil is arranged on the GIS busbar housing, and the magnetic shielding coil is connected to the output end of the differential amplifier, comprising the following steps:

[0008] Obtain the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculate the difference between the circulating current and the conductor current;

[0009] The difference is amplified by a 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 in the opposite direction to the external interfering magnetic field to offset the external interfering magnetic field;

[0010] Measure the ambient noise level outside the magnetic shield coil;

[0011] The environmental noise level is monitored in real time and the intensity of the driving signal is dynamically adjusted according to the change in the environmental noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

[0012] Furthermore, the circulating current of the GIS busbar jumper bar and the busbar conductor current are obtained, including:

[0013] A transformer measuring coil is arranged at the GIS busbar jumper bar. The 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.

[0014] A current transformer is arranged at the internal guide rod of the GIS busbar, and the conductor current is obtained by reading the current transformer.

[0015] Furthermore, the ambient noise level outside the magnetic shielding coil is measured, including:

[0016] A magnetic field sensor is arranged outside the magnetic shielding coil to monitor the external background magnetic field interference in real time. The background magnetic field interference includes the earth's magnetic field, the magnetic field generated by neighboring equipment, and the magnetic field generated by other external electromagnetic sources.

[0017] Furthermore, the intensity of the driving signal is dynamically adjusted according to the change in the ambient noise level, including:

[0018] Obtain the background noise value of the magnetic field sensor and use the background noise value as a given quantity;

[0019] According to the change amplitude of the background noise value and the environmental noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the strength of the driving signal to adapt to different detection environments.

[0020] In a second aspect, the present invention provides a GIS busbar housing magnetic field measurement shielding packaging device, comprising:

[0021] Magnetic shielding module, differential amplification module, data acquisition module, magnetic field measurement module and closed-loop control module;

[0022] The magnetic shielding module is provided with a magnetic shielding coil, and the magnetic shielding coil is arranged on the GIS busbar housing;

[0023] The differential amplifier module is provided with a differential amplifier, and the output end of the differential amplifier is connected to the magnetic shielding coil;

[0024] The data acquisition module is used to obtain the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculate the difference between the circulating current and the conductor current;

[0025] The differential amplifier module is used to amplify the difference through a differential amplifier, generate a driving signal of corresponding strength and send it to the magnetic shielding coil, so that the magnetic shielding coil generates a magnetic field in the opposite direction to the external interference magnetic field to offset the external interference magnetic field;

[0026] The magnetic field measurement module is used to measure the ambient noise level outside the magnetic shielding coil;

[0027] The closed-loop control module is used to monitor the environmental noise level in real time and dynamically adjust the intensity of the driving signal according to the change amplitude of the environmental noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

[0028] Further, the data acquisition module includes a transformer measuring coil and a current transformer, including:

[0029] The transformer measuring coil is arranged at the GIS busbar jumper bar to sense the magnetic field changes in the GIS busbar and convert them into corresponding current signals to obtain circulating current;

[0030] The current transformer is arranged at the internal guide rod of the GIS busbar to obtain the conductor current.

[0031] 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 neighboring devices, and the magnetic field generated by other external electromagnetic sources.

[0032] Furthermore, in the closed-loop control module, the intensity of the driving signal is dynamically adjusted according to the change amplitude of the ambient noise level, including:

[0033] Obtain the background noise value of the magnetic field sensor and use the background noise value as a given quantity;

[0034] According to the change amplitude of the background noise value and the environmental noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the strength of the driving signal to adapt to different detection environments.

[0035] In a third aspect, the present invention provides a computer device, the device comprising a processor and a memory:

[0036] The memory is used to store the computer program and send the instructions of the computer program to the processor;

[0037] The processor executes a GIS busbar housing magnetic field measurement shielding packaging method as described in the first aspect according to the instructions of the computer program.

[0038] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a GIS busbar housing magnetic field measurement shielding packaging method as in the first aspect is implemented.

[0039] In summary, the present invention provides a GIS busbar housing magnetic field measurement shielding packaging method, a magnetic shielding coil is arranged on the GIS busbar housing, and the magnetic shielding coil is connected to the output end of the differential amplifier, including obtaining the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculating the difference between the circulating current and the conductor current; amplifying the difference through the differential amplifier, generating a driving signal of corresponding strength and sending it to the magnetic shielding coil, so that the magnetic shielding coil generates a magnetic field in the opposite direction of the external interference magnetic field to offset the external interference magnetic field; measuring the environmental noise level outside the magnetic shielding coil; real-time monitoring of the environmental noise level and dynamically adjusting the intensity of the driving signal according to the change amplitude of the environmental noise level, so that the magnetic shielding coil maintains the best shielding effectiveness. The present invention calculates the difference between the GIS busbar conductor current and the circulating current, and uses the differential amplifier to amplify the difference signal, so that the detection system can more accurately capture the weak magnetic field signal generated by the internal defect, thereby realizing the directional gating of the internal defect and the active suppression of the external interference magnetic field; at the same time, the shielding effectiveness is dynamically adjusted and adjusted by the self-calibration method to adapt to different detection environments, which helps to improve the magnetic field detection efficiency of the GIS busbar and ensure the safe and stable operation of the power system.

[0040] The present invention also provides a GIS busbar housing magnetic field measurement shielding packaging device, computer equipment and computer-readable storage medium, which have similar effects to the above method when implemented and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1A flowchart of a GIS busbar housing magnetic field measurement shielding packaging method provided by an embodiment of the present invention;

[0043] Figure 2 A wiring schematic diagram of a GIS busbar housing magnetic field measurement shielding packaging device provided by an embodiment of the present invention;

[0044] Figure 3 A block diagram of a computer device provided in an embodiment of the present invention.

[0045] In the attached figure: 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 DESCRIPTION

[0046] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1 , an embodiment of the present invention provides a GIS busbar housing magnetic field measurement shielding packaging method, a magnetic shielding coil is arranged on the GIS busbar housing, and the magnetic shielding coil is connected to the output end of the differential amplifier. It can be understood that the magnetic shielding coil is a coil wound by a wire, and a magnetic field will be generated when a current passes through it. The intensity 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 that can amplify 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).

[0048] The method comprises the following steps:

[0049] S1: Obtain the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculate the difference between the circulating current and the conductor current.

[0050] It should be noted that the jumper bar is a conductor bar used to connect different parts of the GIS busbar, which plays the role of electrical connection. The circulating current is the current induced in the jumper bar of the GIS busbar shell, and the conductor current is the actual working current flowing through the internal conductor of the GIS busbar.

[0051] This step measures the circulating current of the GIS busbar jumper bar and the busbar conductor current respectively, and then subtracts the two measured values ​​to obtain the difference between them. By calculating the difference between the two, a net current signal reflecting the internal defect is obtained.

[0052] S2: The difference is amplified by a 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 in the opposite direction to the external interfering magnetic field to offset the external interfering magnetic field.

[0053] It should be noted that the driving signal refers to an electrical signal amplified by a differential amplifier and is used to drive the magnetic shielding coil to work.

[0054] In this step, the difference obtained in step S1 is input into the differential amplifier, and the differential amplifier amplifies the difference signal according to its amplification characteristics to generate a driving signal whose strength is related to the difference. The driving signal is sent to the magnetic shielding coil. According to Ampere's law, the current passing through the coil will generate a magnetic field. Since the driving 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, so that they can cancel each other out, thereby achieving the purpose of shielding the external interference magnetic field.

[0055] S3: Measure the ambient noise level outside the magnetic shield coil.

[0056] It should be noted that the environmental noise level refers to the interference intensity generated by various interference magnetic fields and other noise sources outside the magnetic shielding coil.

[0057] This step measures the environment outside the magnetic shielding coil to obtain information such as the intensity of noise in the current environment. The noise may be an interfering magnetic field that is not completely shielded or other newly generated interference sources.

[0058] S4: Monitor the ambient noise level in real time and dynamically adjust the intensity of the driving signal according to the change in the ambient noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

[0059] It should be noted that in this step, the ambient noise level is continuously measured by the measuring device, and the measurement results are fed back to the control system in real time. The control system adjusts the intensity of the drive signal according to the set rules (such as when the noise level changes by more than a certain threshold), such as increasing or decreasing the amplitude of the drive signal. The adjusted drive signal is sent to the magnetic shielding coil to change the magnetic field strength generated by the magnetic shielding coil, so that the magnetic shielding coil maintains the best shielding effectiveness to cope with the changing ambient noise.

[0060] This embodiment provides a GIS busbar housing magnetic field measurement shielding packaging method, which obtains the difference between the circulating current and the conductor current of the GIS busbar, amplifies the difference signal using a differential amplifier, and drives the magnetic shielding coil to generate a reverse magnetic field to offset the external interference magnetic field. At the same time, the self-calibration function is realized by real-time monitoring of the environmental noise level and dynamically adjusting the driving signal strength. This method not only improves the accuracy of internal defect magnetic field detection, but also significantly enhances the anti-interference ability of the system.

[0061] In one embodiment, a method for measuring circulating current and conductor current is provided. In this embodiment, obtaining the circulating current and bus conductor current of the GIS bus jumper bar includes:

[0062] S11: A transformer measuring coil is arranged at the GIS busbar jumper bar. The 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.

[0063] It should be noted that the mutual inductor measuring coil is a measuring device made using the principle of electromagnetic induction, which is wound by a coil. It can sense changes in the surrounding magnetic field and convert the changes in the magnetic field into electrical signals (usually current signals) for output.

[0064] In this step, the transformer measuring coil is arranged at the GIS busbar jumper bar. Since the circulating current in the jumper bar will generate a changing magnetic field around it, this changing magnetic field will pass through the transformer measuring coil. According to the principle of electromagnetic induction, when the magnetic flux passing through the coil changes, an induced electromotive force will be generated in the coil, thereby generating an induced current. By measuring and processing this induced current, the current signal related to the jumper bar circulating current can be obtained, and then the information such as the size and direction of the circulating current can be obtained. For example, if the circulating current increases, the rate of change of the magnetic flux passing through the transformer measuring coil will also increase, and the induced current will also increase accordingly. By measuring the size of the induced current, the size of the circulating current can be inferred.

[0065] S12: A current transformer is arranged at the internal guide rod of the GIS busbar, and the conductor current is obtained by reading the current transformer.

[0066] It should be noted that the current transformer is an instrument specially used to measure large currents. It is based on the principle of electromagnetic induction and consists of a primary winding, a secondary winding, and an iron core. The primary winding is connected in series in the circuit being measured, and the secondary winding is connected to a measuring instrument or a protective device. When current passes through the primary winding, an alternating magnetic field is generated in the iron core, and this magnetic field induces a corresponding current in the secondary winding. By measuring the current in the secondary winding and based on the transformation ratio of the current transformer, the current in the primary winding (i.e. the circuit being measured) can be calculated.

[0067] In this step, a current transformer is arranged at the internal guide rod of the GIS busbar, and the primary winding of the current transformer is connected in series in the circuit of the internal guide rod, so that the conductor current in the internal guide rod passes through the primary winding. According to the principle of electromagnetic induction, the current in the primary winding will generate an alternating magnetic field in the iron core, and this magnetic field will induce a corresponding current in the secondary winding. The current value of the secondary winding is read by the measuring device connected to the secondary winding, and the conductor current in the internal guide rod of the GIS busbar can be calculated based on the transformation ratio of the current transformer (for example, the ratio of the number of turns of the primary winding to the number of turns of the secondary winding).

[0068] The traditional GIS busbar magnetic field measurement method mainly relies on external magnetic field sensors for direct measurement, which makes it difficult to capture the weak magnetic field signals generated by internal defects. However, the present invention measures the circulating current of the GIS busbar jumper bar and the conductor current of the transformer, and calculates the difference, thus achieving directional gating of the internal defect magnetic field.

[0069] In one embodiment, a method for measuring an environmental noise level is provided. In this embodiment, measuring the environmental noise level outside the magnetic shielding coil includes:

[0070] A magnetic field sensor is arranged outside the magnetic shielding coil to monitor the external background magnetic field interference in real time. The background magnetic field interference includes the earth's magnetic field, the magnetic field generated by neighboring equipment, and the magnetic field generated by other external electromagnetic sources.

[0071] It should be noted that a magnetic field sensor is a device that can detect the presence of a surrounding magnetic field and convert relevant information of the magnetic field (such as magnetic field strength, direction, etc.) into a measurable electrical signal (such as voltage, current, etc.). The geomagnetic field in the background magnetic field interference is the magnetic field of the earth itself. It is a global magnetic field, and its strength and direction vary in different geographical locations and time. The geomagnetic field is a naturally existing source of magnetic field interference, which may have a certain impact on applications such as high-precision magnetic field measurement. The magnetic field generated by neighboring equipment refers to the environment in which the GIS bus is located. There may be other electrical equipment, mechanical equipment, etc. around. These equipment will generate magnetic fields during operation. For example, when motors, transformers and other equipment are running, they will generate strong magnetic fields. These magnetic fields may interfere with the operation of the magnetic shielding coil and related magnetic field measurements. The magnetic field generated by other external electromagnetic sources refers to the electromagnetic radiation generated by various other possible electromagnetic sources, such as wireless communication equipment, lightning activities, etc. These electromagnetic radiations will also form magnetic field interference and affect the magnetic field environment outside the magnetic shielding coil.

[0072] In one embodiment, a method for dynamically adjusting the strength of a driving signal is provided. In this embodiment, dynamically adjusting the strength of a driving signal according to the variation of an ambient noise level includes:

[0073] S41: Acquire the background noise value of the magnetic field sensor, and use the background noise value as a given value.

[0074] It should be noted that the background noise value of the magnetic field sensor refers to the measurement value corresponding to the noise signal generated by the magnetic field sensor when there is no external effective magnetic field signal input and it is only affected by factors such as thermal noise of internal electronic components and circuit noise. It is the inherent noise level of the magnetic field sensor itself, reflecting the background noise characteristics of the sensor. For example, when there is no external magnetic field, the Hall sensor will produce certain tiny electrical signal fluctuations due to the thermal motion of its internal electrons and other reasons. The measurement value corresponding to this fluctuation is the background noise value. In the control system, a fixed value or reference value is set in advance, and the system will perform corresponding adjustments and controls based on this value. In this embodiment, the background noise value of the magnetic field sensor is taken as a given quantity, and subsequent control operations will be performed based on this.

[0075] By measuring the magnetic field sensor when there is no external effective magnetic field input, the output electrical signal is obtained. Since only the sensor's own noise floor is affected at this time, the output signal is processed and analyzed to obtain a value that can represent the sensor's noise floor level, namely the noise floor value. This noise floor value reflects the basic noise characteristics of the sensor. When judging the changes in the environmental noise level later, it needs to be used as a reference benchmark to distinguish the noise changes that are actually caused by the external environment.

[0076] S42: According to the change amplitude of the background noise value and the environmental noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the intensity of the driving signal to adapt to different detection environments.

[0077] It should be noted that the amplitude of the change in the environmental noise level refers to the degree of change in the intensity of the external environmental noise (i.e., background magnetic field interference) of the magnetic shielding coil at different times compared with the previous time. It can be determined by calculating the difference between the environmental noise measurement values ​​at different times or the relative change ratio. The closed-loop control method is a control method of an automatic control system. The system will compare the feedback information of the output (here is the environmental noise level) with the given quantity (the background noise value of the magnetic field sensor), and then adjust the control quantity (the gain of the differential amplifier) ​​according to the comparison result, so that the output is as close to the given quantity as possible. In this process, the output of the system will be continuously fed back to the input to form a closed loop, thereby realizing dynamic adjustment of the system.

[0078] This step compares the real-time monitored environmental noise level with the previously acquired background noise value of the magnetic field sensor, and calculates the change amplitude of the environmental noise level. Then, according to this change amplitude, a closed-loop control algorithm (such as a proportional-integral-differential control algorithm, i.e., a PID control algorithm) is used to determine how the gain of the differential amplifier needs to be adjusted. For example, if the environmental noise level increases, it means that the external interference magnetic field is enhanced. In order to make the magnetic shielding coil generate a stronger reverse magnetic field to offset the interference, it is necessary to increase the gain of the differential amplifier, thereby increasing the strength of the drive signal; conversely, if the environmental noise level decreases, the gain of the differential amplifier can be appropriately reduced. By continuously monitoring the environmental noise level, comparing the difference with the background noise value, and adjusting the gain of the differential amplifier, a closed-loop control process is formed to achieve dynamic adjustment of the drive signal strength to adapt to different detection environments. This step is the core of the self-calibration function of the present invention, which allows the system to automatically adjust the shielding effectiveness according to the actual measured background noise value and external interference to adapt to different detection environments and conditions.

[0079] According to the change range of the background noise value and the environmental noise level, the gain of the differential amplifier is dynamically adjusted through the closed-loop control method, thereby changing the strength of the driving signal, so that the magnetic shielding coil can adjust the generated magnetic field strength in real time according to the change of the external environmental noise. This can ensure that the magnetic shielding coil can maintain the best shielding effectiveness under different environmental interference conditions, effectively offset the external interference magnetic field, improve the accuracy and reliability of GIS busbar magnetic field measurement, and also enhance the adaptability of the entire system to different detection environments.

[0080] Based on the same inventive concept, the embodiment of the present application also provides a GIS busbar housing magnetic field measurement shielding packaging device for implementing the above-mentioned GIS busbar housing magnetic field measurement shielding packaging method. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above-mentioned method, so the specific limitations in the embodiment of the GIS busbar housing magnetic field measurement shielding packaging device provided below can refer to the limitations of the GIS busbar housing magnetic field measurement shielding packaging method above, and will not be repeated here.

[0081] See also Figure 2 , an embodiment of the present invention provides a GIS busbar housing magnetic field measurement shielding packaging device, including a magnetic shielding module, a differential amplification module, a data acquisition module, a magnetic field measurement module and a closed-loop control module;

[0082] The magnetic shielding module is provided with a magnetic shielding coil 4, and the magnetic shielding coil 4 is arranged on the GIS busbar housing;

[0083] The differential amplifier module is provided with a differential amplifier (composed of a differential circuit 5 and a controllable amplifier 6), and the output end of the differential amplifier is connected to the magnetic shielding coil 4;

[0084] The data acquisition module is used to obtain the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculate the difference between the circulating current and the conductor current;

[0085] The differential amplifier module is used to amplify the difference through a differential amplifier, generate a driving signal of corresponding strength and send it to the magnetic shielding coil, so that the magnetic shielding coil generates a magnetic field in the opposite direction to the external interference magnetic field to offset the external interference magnetic field;

[0086] The magnetic field measurement module is used to measure the ambient noise level outside the magnetic shielding coil;

[0087] The closed-loop control module is used to monitor the environmental noise level in real time and dynamically adjust the intensity of the driving signal according to the change amplitude of the environmental noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

[0088] 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) will be generated in the conductor. Defects inside the GIS bus, such as partial discharge or insulation aging, will produce specific magnetic field changes around the bus, which can be detected by the transformer measurement coil. By measuring the conductor current of the GIS bus and the circulating current caused by the internal defects, and differentiating the two current values, a net current signal reflecting the internal defects can be obtained. This differential signal can effectively highlight 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 interference magnetic field to achieve mutual cancellation of the magnetic fields. This active shielding technology can significantly reduce the impact of the external magnetic field on the magnetic field measurement inside the GIS bus.

[0089] By monitoring the noise floor value of the magnetic field sensor in real time and taking it as a given quantity, the system can dynamically adjust the gain of the differential amplifier. This self-calibration function enables the system to adapt to different environmental conditions and ensure the accuracy and reliability of the measurement signal. The system adopts a closed-loop control mechanism to adjust the effectiveness of the magnetic shielding coil according to the real-time output of the magnetic field sensor. This mechanism ensures that the system can respond quickly when the external magnetic field interference changes and maintain the best shielding effect.

[0090] Further, the data acquisition module includes a transformer measuring coil 2 and a current transformer 1, including:

[0091] The transformer measuring coil 2 is arranged at the GIS busbar jumper bar, and is used to sense the magnetic field changes in the GIS busbar and convert them into corresponding current signals to obtain circulating current;

[0092] The current transformer 1 is arranged at the inner rod of the GIS busbar and is used to obtain the conductor current.

[0093] 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 earth's magnetic field, the magnetic field generated by neighboring devices, and the magnetic field generated by other external electromagnetic sources.

[0094] Furthermore, in the closed-loop control module, the intensity of the driving signal is dynamically adjusted according to the change amplitude of the ambient noise level, including:

[0095] Obtain the background noise value of the magnetic field sensor and use the background noise value as a given quantity;

[0096] According to the variation of the background noise 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 intensity of the driving signal to adapt to different detection environments.

[0097] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the 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 embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0098] Reference Figure 3 An embodiment of the present invention further 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, a GIS busbar housing magnetic field measurement shielding packaging method as described in any one of the above methods is implemented.

[0099] The computer device may be a desktop computer, a notebook, a PDA, a cloud server or other computing device. The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that Figure 3It is only an example of a computer device and does not constitute a limitation of the computer device. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0100] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0101] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory may also be an external storage device of the computer device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the computer device. Further, the memory may include both an internal storage unit and an external storage device of the computer device. The memory is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory may also be used to temporarily store data that has been output or is to be output.

[0102] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a shielding and packaging method for measuring a magnetic field of a GIS busbar housing is implemented as described in any one of the above methods.

[0103] In this embodiment, if the integrated unit is implemented in the form of 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, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, USB flash drive, mobile hard disk, disk or optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0104] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0105] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0106] In the embodiments disclosed in the present 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 only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A GIS busbar housing magnetic field measurement shielding packaging method, characterized in that: A magnetic shielding coil is arranged on the GIS busbar housing, and the magnetic shielding coil is connected to the output end of the differential amplifier, comprising the following steps: Obtaining the circulating current of the GIS busbar jumper bar and the busbar conductor current and calculating 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 in the opposite direction to the external interfering magnetic field to offset the external interfering magnetic field; measuring an ambient noise level outside the magnetic shielding coil; The environmental noise level is monitored in real time and the intensity of the driving signal is dynamically adjusted according to the variation of the environmental noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

2. The GIS busbar housing magnetic field measurement shielding packaging method according to claim 1 is characterized in that: Obtain the circulating current of the GIS busbar jumper bar and the busbar conductor current, including: A mutual inductor measuring coil is arranged at the GIS busbar jumper bar, and the mutual inductor 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 arranged at the inner guide rod of the GIS busbar, and the conductor current is obtained by reading the current transformer.

3. The GIS busbar housing magnetic field measurement shielding packaging method according to claim 1 is characterized in that: Measuring the ambient noise level outside the magnetic shield coil, including: 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 adjacent equipment, and the magnetic field generated by other external electromagnetic sources.

4. The GIS busbar housing magnetic field measurement shielding packaging method according to claim 3 is characterized in that: Dynamically adjusting the intensity of the driving signal according to the change amplitude of the environmental noise level includes: Acquire a background noise value of the magnetic field sensor, and use the background noise value as a given quantity; According to the variation range of the background noise value and the environmental noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the intensity of the driving signal to adapt to different detection environments.

5. A GIS busbar housing magnetic field measurement shielding packaging device, characterized in that: include: Magnetic shielding module, differential amplification module, data acquisition module, magnetic field measurement module and closed-loop control module; The magnetic shielding module is provided with a magnetic shielding coil, and the magnetic shielding coil is arranged on the GIS busbar housing; The differential amplification module is provided with a differential amplifier, and the output end of the differential amplifier is connected to the magnetic shielding coil; The data acquisition module is used to obtain the circulating current of the GIS busbar jumper bar and the busbar conductor current and 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 to the magnetic shielding coil, so that the magnetic shielding coil generates a magnetic field in the opposite direction to the external interfering magnetic field to offset the external interfering magnetic field; The magnetic field measurement module is used to measure the environmental noise level outside the magnetic shielding coil; The closed-loop control module is used to monitor the environmental noise level in real time and dynamically adjust the intensity of the driving signal according to the change amplitude of the environmental noise level, so that the magnetic shielding coil maintains the best shielding effectiveness.

6. The GIS busbar housing magnetic field measurement shielding packaging device according to claim 5 is characterized in that: The data acquisition module includes a transformer measuring coil and a current transformer, including: The mutual inductor measuring coil is arranged at the GIS busbar jumper bar, and is used to sense the magnetic field change in the GIS busbar and convert it into a corresponding current signal to obtain the circulating current; The current transformer is arranged at the inner guide rod of the GIS busbar and is used to obtain the conductor current.

7. The GIS busbar housing magnetic field measurement shielding packaging device according to claim 5 is 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 adjacent devices, and the magnetic field generated by other external electromagnetic sources.

8. The GIS busbar housing magnetic field measurement shielding packaging device according to claim 7 is characterized in that: In the closed-loop control module, dynamically adjusting the intensity of the driving signal according to the change amplitude of the environmental noise level includes: Acquire a background noise value of the magnetic field sensor, and use the background noise value as a given quantity; According to the variation range of the background noise value and the environmental noise level, the gain of the differential amplifier is dynamically adjusted through a closed-loop control method, thereby changing the intensity of the driving signal to adapt to different detection environments.

9. A computer device, characterized in that: The device comprises a processor and a memory: The memory is used to store a computer program and send instructions of the computer program to the processor; The processor executes a GIS busbar housing magnetic field measurement shielding packaging method as described in any one of claims 1-4 according to the instructions of the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a GIS busbar housing magnetic field measurement shielding packaging method as described in any one of claims 1 to 4 is implemented.

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