Transformer shell metal internal magnetic field acquisition sensor

Abstract

The invention discloses a transformer shell metal internal magnetic field acquisition sensor, which relates to the technical field of magnetic field acquisition, and comprises an X-axis acquisition piece and a Y-axis acquisition piece which are arranged in a shell, are isolated from the shell through a shielding device, and are used for respectively measuring a transverse component and a longitudinal component of a transformer shell metal internal magnetic field; after acquisition, the component is converted into a current signal through a coil arranged in the shell, and the current signal is output through a signal line interface arranged at the side part of the shell. The device is simple in structure, convenient and rapid to operate, good in stability and high in adaptability, the workload of operators is relieved, and the influence of manual misoperation on the accuracy of measured data is reduced; the internal magnetic field deviation angle of the transformer metal shell is calculated by measuring the transverse component and the longitudinal component of the metal internal magnetic field of the transformer shell, the larger the magnetic field deviation angle is, the more serious the internal defects of the transformer are, and reliable data are provided for state monitoring and fault diagnosis of the transformer.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic field acquisition, and in particular relates to a sensor for acquiring magnetic field inside a metal casing of a transformer. Background Art

[0002] When a transformer is operating, the magnetic field in the core constantly fluctuates due to changes in current. For example, when the transformer load changes, the current also changes accordingly, causing the magnetic field strength and direction to change. Internal transformer faults, such as winding short circuits and localized core overheating, can also cause abnormal changes in the magnetic field.

[0003] In addition, when the external bolts of the transformer casing are loose, the internal metal is grounded at multiple points, and other internal defects cause spiral eddy current heating, the magnetic field of the transformer metal casing is offset, the density is abnormal, etc., the magnetic field inside the transformer metal will become abnormal. When the magnetic field inside the transformer changes, the magnetic flux passing through the sensor sensing element will also change accordingly.

[0004] The existing detection method can only detect anomalies with detection sensors, and then manually analyze and eliminate the causes and conduct on-site inspections. This has the problems of low work efficiency and inaccurate analysis results.

[0005] Therefore, in order to solve the above problems, it is necessary to design a transformer casing metal internal magnetic field acquisition sensor to collect the magnetic field inside the transformer metal casing and provide reliable data for transformer status monitoring and fault diagnosis. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art and to design a new transformer casing metal internal magnetic field acquisition sensor. This transformer casing metal internal magnetic field acquisition sensor has a simple structure, is easy and quick to operate, has good stability, and is highly adaptable. It not only reduces the workload of operators but also reduces the impact of improper manual operation on the accuracy of measurement data. The sensor comprises an X-axis acquisition component and a Y-axis acquisition component arranged in the casing. The two are isolated by a shielding device and the casing, and respectively measure the transverse component and the longitudinal component of the magnetic field inside the transformer casing metal. The magnetic field offset angle inside the transformer metal casing is calculated based on the electromagnetic field strength of the transverse component and the electromagnetic field strength of the longitudinal component. The larger the magnetic field offset angle, the more serious the internal defect of the transformer. The sensor provides reliable data for transformer status monitoring and fault diagnosis, and solves the problem that there is no special detection equipment for abnormal magnetic field inside the metal casing of the existing transformer.

[0007] The solution adopted by the present invention to solve the technical problem is:

[0008] A sensor for collecting magnetic fields inside the metal casing of a transformer.

[0009] It is characterized by:

[0010] Including the shell,

[0011] A collection device is provided inside the housing.

[0012] The collection device includes an X-axis collection component and a Y-axis collection component.

[0013] A shielding device is provided between the X-axis collection component and the Y-axis collection component.

[0014] The X-axis acquisition component includes an X-axis high-permeability core for collecting the transverse component of the magnetic field inside the metal shell of the transformer and an X-axis coil for converting the transverse component of the magnetic field inside the metal shell of the transformer into a transverse current signal.

[0015] The Y-axis acquisition component includes a Y-axis high-permeability core for collecting the longitudinal component of the magnetic field inside the metal shell of the transformer and a Y-axis coil for converting the longitudinal component of the magnetic field inside the metal shell of the transformer into a longitudinal current signal.

[0016] A cover is provided at one end of the shell.

[0017] The ends of the X-axis high magnetic permeability iron core and the Y-axis high magnetic permeability iron core and the other end of the shell are arranged on the same plane.

[0018] The side of the shell is provided with a signal line interface for outputting a transverse current signal and a longitudinal current signal.

[0019] As a preferred embodiment of the present invention, the X-axis high magnetic permeability iron core includes a second iron core, one end of the second iron core is connected to the first iron core, the other end of the second iron core is connected to the third iron core, the first iron core and the third iron core are arranged in parallel, and the second iron core is perpendicular to the first iron core and the third iron core.

[0020] The X-axis coil is wound around the outside of the second iron core.

[0021] The Y-axis high magnetic permeability core includes a fifth core, one end of the fifth core is connected to the fourth core, the other end of the fifth core is connected to the sixth core, the fourth core and the sixth core are arranged in parallel, and the fifth core is perpendicular to the fourth core and the sixth core.

[0022] The Y-axis coil is wound around the outside of the fifth core.

[0023] As a preferred embodiment of the present invention, the shielding device is a solid cuboid.

[0024] The shielding device is provided with a prefabricated hole for placing the X-axis coil and a first prefabricated groove for placing the Y-axis coil.

[0025] As a preferred embodiment of the present invention, a fixing groove for fixing the collecting device and the shielding device is provided inside the housing.

[0026] The fixing grooves include a first fixing groove, a second fixing groove, a third fixing groove, a fourth fixing groove and a fifth fixing groove,

[0027] The first fixing groove is used to place the first iron core.

[0028] The second fixing groove is used to place the third iron core.

[0029] The third fixing groove is used to place the fourth iron core.

[0030] The fourth fixing groove is used to place the sixth iron core.

[0031] The fifth fixing groove is used to place the shielding device, the second iron core, the X-axis coil, the fifth iron core and the Y-axis coil.

[0032] As a preferred embodiment of the present invention, the first core, the second core, the third core, the fourth core, the fifth core and the sixth core all adopt a rectangular columnar structure.

[0033] As a preferred embodiment of the present invention, a second prefabricated groove for placing the Y-axis coil is provided inside the cover.

[0034] As a preferred embodiment of the present invention, the second prefabricated groove is an arc-shaped groove that fits the Y-axis coil.

[0035] As a preferred embodiment of the present invention, the outer wall of the shell and the outer wall of the cover are both provided with rounded corners.

[0036] As a preferred embodiment of the present invention, the shell and the cover are both made of insulating plastic material.

[0037] As a preferred embodiment of the present invention, the X-axis high magnetic permeability iron core and the Y-axis high magnetic permeability iron core are both made of high magnetic permeability materials.

[0038] The X-axis coil and the Y-axis coil are both made of copper.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The device of the present invention provides a transformer casing metal internal magnetic field acquisition sensor, which has a simple structure, convenient and quick operation, good stability, and strong adaptability. It not only reduces the workload of operators but also reduces the impact of improper manual operation on the accuracy of measurement data.

[0041] Specifically, it includes an X-axis acquisition component and a Y-axis acquisition component set in the shell. The two are isolated by a shielding device and the shell, and respectively measure the transverse component and longitudinal component of the magnetic field inside the metal shell of the transformer. The magnetic field offset angle inside the metal shell of the transformer is calculated based on the electromagnetic field strength of the transverse component and the electromagnetic field strength of the longitudinal component. The larger the magnetic field offset angle, the more serious the internal defects of the transformer, providing reliable data for transformer status monitoring and fault diagnosis.

[0042] It has the following advantages:

[0043] 1. High precision: It can accurately collect the magnetic field information inside the metal casing of the transformer, providing reliable data for transformer status monitoring and fault diagnosis.

[0044] 2. High stability: Under different working environments, such as temperature and humidity changes, it can still maintain stable performance to ensure the accuracy and reliability of collected data.

[0045] 3. Strong anti-interference ability: It can effectively resist external electromagnetic interference and ensure that the collected magnetic field information is true and reliable.

[0046] 4. Easy installation: It can be flexibly installed according to the actual situation of the transformer without affecting the normal operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the structure of a sensor for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0048] Figure 2 This is a bottom view of a sensor for collecting magnetic fields inside a transformer casing metal structure proposed by the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of a sensor for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0050] Figure 4 This is a schematic diagram of a sensor device for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0051] Figure 5 This is a schematic diagram of a sensor device for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0052] Figure 6 This is a schematic diagram of the housing of a sensor for collecting magnetic fields inside a transformer casing, as proposed by the present invention;

[0053] Figure 7 This is a schematic diagram of a sensor device for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0054] Figure 8 This is a partial schematic diagram of a sensor for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0055] Figure 9 This is a side view of a sensor for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0056] Figure 10 This is a schematic diagram of a sensor device for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0057] Figure 11 This is a schematic diagram of the structure of a sensor for collecting magnetic fields inside the metal casing of a transformer proposed by the present invention;

[0058] Figure 12 This is a schematic diagram of the magnetic field inside the metal casing of the transformer;

[0059] Figure 13 Schematic diagram of the magnetic field deviation angle inside the transformer metal casing.

[0060] Description of reference numerals:

[0061] 1. Shell,

[0062] 1-1-1, first fixing slot,

[0063] 1-1-2, the second fixing slot,

[0064] 1-1-3, the third fixing slot,

[0065] 1-1-4, the fourth fixing slot,

[0066] 1-1-5, the fifth fixed slot,

[0067] 2. Collection device,

[0068] 2-1, X-axis collection parts,

[0069] 2-1-1, X-axis high magnetic permeability core,

[0070] 2-1-1-1, the first core,

[0071] 2-1-1-2, the second core,

[0072] 2-1-1-3, the third core,

[0073] 2-1-2, X-axis coil,

[0074] 2-2, Y-axis collection parts,

[0075] 2-2-1, Y-axis high magnetic permeability core,

[0076] 2-2-1-1, the fourth core,

[0077] 2-2-1-2, the fifth core,

[0078] 2-2-1-3, the sixth core,

[0079] 2-2-2, Y-axis coil,

[0080] 3. Shielding device,

[0081] 3-1, prefabricated holes,

[0082] 3-2, the first prefabricated trough,

[0083] 4. Cover body,

[0084] 4-1, the second prefabricated trough,

[0085] 5. Signal line interface. DETAILED DESCRIPTION

[0086] The specific implementation of the present invention is described below with reference to the accompanying drawings and embodiments:

[0087] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0088] At the same time, in the description of the present invention, it should be understood that the terms "one end", "the other end", "middle", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0089] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0090] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0091] like Figures 1-11 As shown, the present invention proposes a transformer shell metal internal magnetic field acquisition sensor, which includes a shell 1, and a collection device 2 is arranged inside the shell 1. The shell 1 is used to separate the collection device 2 from the outside world.

[0092] The acquisition device 2 includes an X-axis acquisition component 2-1 and a Y-axis acquisition component 2-2, which respectively collect the transverse component and the longitudinal component of the magnetic field inside the metal shell of the transformer. The magnetic field offset angle inside the metal shell of the transformer is calculated based on the electromagnetic field strength of the transverse component and the electromagnetic field strength of the longitudinal component. The magnetic field offset angle is calculated based on the inverse trigonometric relationship. When the sensor position and direction are in ideal conditions, the larger the magnetic field offset angle, the more serious the internal defects of the transformer, providing reliable data for transformer status monitoring and fault diagnosis.

[0093] A shielding device 3 is provided between the X-axis acquisition component 2-1 and the Y-axis acquisition component 2-2. The shielding device 3 and the housing isolate the X-axis acquisition component 2-1 and the Y-axis acquisition component 2-2 to prevent the two acquisition components from affecting each other and causing inaccurate measurement results.

[0094] The X-axis acquisition component 2-1 and the Y-axis acquisition component 2-2 are made of high-magnetic permeability materials and magnetic induction coils. The high-magnetic permeability materials use the "parallel principle" to "lead out" the magnetic field inside the metal shell, and then use the magnetic induction coils to convert the magnetic field signal into a current signal for analysis of relevant data.

[0095] Specifically, the X-axis acquisition component 2-1 includes an X-axis high-permeability iron core 2-1-1 for collecting the transverse component of the magnetic field inside the metal of the transformer casing and an X-axis coil 2-1-2 for converting the transverse component of the magnetic field inside the metal of the transformer casing into a transverse current signal. The Y-axis acquisition component 2-2 includes a Y-axis high-permeability iron core 2-2-1 for collecting the longitudinal component of the magnetic field inside the metal of the transformer casing and a Y-axis coil 2-2-2 for converting the longitudinal component of the magnetic field inside the metal of the transformer casing into a longitudinal current signal. The magnetic field signal inside the metal of the transformer casing is collected by the X-axis high-permeability iron core 2-1-1 and the Y-axis high-permeability iron core 2-2-1, and then the signal is converted into a current signal by the X-axis coil 2-1-2 and the Y-axis coil 2-2-2 and output through the signal line interface 5.

[0096] The ends of the X-axis high magnetic permeability core 2-1-1 and the Y-axis high magnetic permeability core 2-2-1 and the other end of the shell 1 are arranged on the same plane, so that the X-axis high magnetic permeability core 2-1-1 and the Y-axis high magnetic permeability core 2-2-1 are simultaneously attached to the transformer shell to collect the magnetic field signal inside the metal of the transformer shell, and are effectively isolated by the shell to ensure that the X-axis high magnetic permeability core 2-1-1 and the Y-axis high magnetic permeability core 2-2-1 will not be disturbed by magnetic fields other than the magnetic field inside the metal of the transformer shell.

[0097] When a transformer is operating, the magnetic field in the core constantly fluctuates due to changes in current. For example, when the transformer load changes, the current also changes accordingly, causing the magnetic field strength and direction to change. Furthermore, internal transformer faults, such as winding short circuits and localized core overheating, can also cause abnormal changes in the magnetic field.

[0098] When the transformer's external casing bolts become loose, the internal metal is grounded at multiple points, or other internal defects cause spiral eddy current heating, magnetic field offset within the transformer's metal casing, or abnormal density, the magnetic field within the transformer's metal casing becomes abnormal. When the internal magnetic field of the transformer changes, the magnetic flux passing through the sensor's inductive element also changes. According to the law of electromagnetic induction, an induced electromotive force is generated in the inductive element. The device of the present invention is therefore designed to collect magnetic fields from within the metal casing of the transformer. During measurement, the magnetic field within the transformer's metal casing is "drawn out" through the device's high-permeability iron core. The magnetic field signal is then converted into a current signal through the device's magnetic induction coil for analysis of relevant data.

[0099] Preferably, an audible and visual alarm device may be provided on the side of the housing 1. When the abnormal change of the magnetic field exceeds a set threshold, an alarm is sounded through the audible and visual alarm device to remind the staff to handle or perform maintenance in time.

[0100] The device of the present invention works based on the principle of electromagnetic induction, and its collection principle is:

[0101] The magnetic field inside the transformer housing is mainly generated by the current inside the transformer. Figure 12 Schematic diagram of the magnetic field inside the transformer housing, in which 101 is the transformer housing, 102 is the magnetic field acquisition sensor of the device of the present invention, and 103 is the magnetic flux lines of the magnetic field inside the metal of the transformer housing. According to the Biot-Savart law, the magnetic field B generated by the current T , that is, the transformer magnetic field can be expressed as:

[0102] ,

[0103] Where dB is the infinitesimal magnetic induction intensity generated by the current element Idl at a distance r, and u0 is the magnetic permeability of vacuum.

[0104] The overall magnetic field of the transformer is the superposition of the magnetic fields generated by all current elements, that is:

[0105] ,

[0106] When in a magnetic field, according to Faraday's law of electromagnetic induction, the induced electromotive force E generated by the magnetic field acquisition sensor of the device of the present invention is related to the rate of change of the magnetic flux passing through it:

[0107] ,

[0108] Where N is the number of turns of the magnetic field acquisition sensor coil, and Ф is the magnetic flux.

[0109] The magnetic flux Φ detected by the magnetic field acquisition sensor S , which is related to the transformer magnetic field B T And the area S surrounded by the magnetic field acquisition sensor coil S Relevant, namely:

[0110] ,

[0111] The relationship between the magnetic field acquisition sensor (expressed as induced electromotive force) and the magnetic field inside the transformer casing can be expressed by the following formula:

[0112] ,

[0113] It shows that the induced electromotive force of the magnetic field acquisition sensor depends on the rate of change of the magnetic field inside the transformer shell and the parameters of the magnetic field acquisition sensor itself, namely the number of coil turns and the coil area.

[0114] The device of the present invention is composed of two vertical cross structures of high magnetic permeability materials and magnetic induction coils, namely the X-axis acquisition component 2-1 and the Y-axis acquisition component 2-2. The data Φ collected by the X-axis acquisition component 2-1 is X and the data collected by the Y-axis collection component 2-2 Y , through Ф X and Φ Y The two components of the magnetic field strength are used to calculate the offset angle θ of the magnetic field inside the transformer metal shell Ф

[0115] like Figure 13 As shown, according to the inverse triangle relationship, the magnetic field offset angle θ inside the transformer metal shell Ф It can be expressed as:

[0116] ,

[0117] It can be concluded that when the sensor position and direction are ideal, the larger the magnetic field offset angle θФ is, the more serious the internal defects of the transformer are, which reminds the staff to check and repair the transformer fault in time.

[0118] A cover 4 is provided at one end of the housing 1 for covering the housing 1 and the acquisition device 2 to prevent accidental contact by human hands during the measurement process.

[0119] A signal line interface 5 for outputting transverse current signals and longitudinal current signals is provided on the side of the housing 1 , and the collected and converted signals are sent to a receiving device, which processes the data to obtain the magnetic field deviation angle.

[0120] The induced electromotive force generated by the magnetic field acquisition sensor in the device of the present invention is typically weak and requires amplification by a signal amplifier circuit. This amplifier circuit amplifies the weak induced electromotive force to a measurable range for subsequent processing and analysis. Furthermore, filtering is required to remove noise and interference from the signal. Filters can selectively pass or block signals of specific frequencies based on their frequency characteristics, improving signal quality.

[0121] The amplified and filtered signal is typically an analog signal that needs to be converted to a digital signal using an analog-to-digital converter (ADC). Digital signals can be more easily stored, transmitted, and processed. Digital processing also achieves higher accuracy and stability, reducing errors and drift.

[0122] The processed digital signal can be output and displayed in various ways. For example, the magnetic field strength and direction can be displayed directly on a display screen, or the data can be transmitted to a host computer through a communication interface for further analysis and processing.

[0123] The X-axis high-permeability iron core 2-1-1-1 includes a second iron core 2-1-1-2, one end of the second iron core 2-1-1-2 is connected to the first iron core 2-1-1-1, and the other end of the second iron core 2-1-1-2 is connected to the third iron core 2-1-1-3. The first iron core 2-1-1-1 and the third iron core 2-1-1-3 are arranged in parallel, and the second iron core 2-1-1-2 is perpendicular to the first iron core 2-1-1-1 and the third iron core 2-1-1-3. The X-axis coil 2-1-2 is wound around the outside of the second iron core 2-1-1-2; The Y-axis high magnetic permeability core 2-2-1 includes a fifth core 2-2-1-2, one end of the fifth core 2-2-1-2 is connected to the fourth core 2-2-1-1, and the other end of the fifth core 2-2-1-2 is connected to the sixth core 2-2-1-3. The fourth core 2-2-1-1 and the sixth core 2-2-1-3 are arranged in parallel, and the fifth core 2-2-1-2 is perpendicular to the fourth core 2-2-1-1 and the sixth core 2-2-1-3. The Y-axis coil 2-2-2 is wound around the outside of the fifth core 2-2-1-2.

[0124] The first iron core 2-1-1-1, the third iron core 2-1-1-3, the fourth iron core 2-2-1-1 and the sixth iron core 2-2-1-3 all directly contact the transformer casing. The first iron core 2-1-1-1 and the third iron core 2-1-1-3 collect the transverse component of the magnetic field inside the metal of the transformer casing. After collection, it flows through the second iron core 2-1-1-2 and the X-axis coil 2-1-2 wound on the outside, and the X-axis coil 2-1-2 converts the transverse component into a corresponding current signal. At the same time, the fourth iron core 2-2-1-1 and the sixth iron core 2-2-1-3 collect the longitudinal component of the magnetic field inside the metal of the transformer casing. After collection, it flows through the fifth iron core 2-2-1-2 and the Y-axis coil 2-2-2 wound on the outside, and the Y-axis coil 2-2-2 converts the longitudinal component into a corresponding current signal. The current signal is then output through the signal line interface 5.

[0125] The shielding device 3 is a solid cuboid, filling the space inside the shell except the iron core, ensuring isolation between the X-axis acquisition device 2 and the Y-axis acquisition device 2, and ensuring that the two do not interfere with each other when collecting magnetic field components.

[0126] The shielding device 3 is provided with a prefabricated hole 3-1 for placing the X-axis coil 2-1-2 and a first prefabricated groove 3-2 for placing the Y-axis coil 2-2-2. By setting the prefabricated hole 3-1 for the X-axis coil 2-1-2 and the second iron core 2-1-1-2 to pass through, and by setting the prefabricated groove for the Y-axis coil 2-2-2 to pass through, it is ensured that the shielding device 3 contacts the outer shell while not contacting the Y-axis coil 2-2-2, thereby completing the isolation between the X-axis acquisition device 2 and the Y-axis acquisition device 2.

[0127] The housing 1 is provided with fixing grooves for fixing the collecting device 2 and the shielding device 3. The collecting device 2 and the shielding device 3 are fixed by the fixing grooves to prevent them from shifting during transportation, which would cause inaccurate detection results.

[0128] The fixing slots include a first fixing slot 1-1-1, a second fixing slot 1-1-2, a third fixing slot 1-1-3, a fourth fixing slot 1-1-4, and a fifth fixing slot 1-1-5. The first fixing slot 1-1-1 is used to accommodate the first iron core 2-1-1-1, the second fixing slot 1-1-2 is used to accommodate the third iron core 2-1-1-3, the third fixing slot 1-1-3 is used to accommodate the fourth iron core 2-2-1-1, the fourth fixing slot 1-1-4 is used to accommodate the sixth iron core 2-2-1-3, and the fifth fixing slot 1-1-5 is used to accommodate the shielding device 3, the second iron core 2-1-1-2, the X-axis coil 2-1-2, the fifth iron core 2-2-1-2, and the Y-axis coil 2-2-2. All components within the housing 1 are provided with corresponding fixing slots, which ensure precise fixation.

[0129] The first core 2-1-1-1, the second core 2-1-1-2, the third core 2-1-1-3, the fourth core 2-2-1-1, the fifth core 2-2-1-2, and the sixth core 2-2-1-3 all adopt a rectangular columnar structure. This structure simplifies and facilitates stacking, reducing installation difficulty. It also facilitates the creation of the internal fixing slots of the housing, which can be made by simply cutting in a straight line.

[0130] A second prefabricated groove 4-2 for placing the Y-axis coil 2-2-2 is provided inside the cover 4, thereby reducing the weight of the cover 4 while ensuring the insulation performance of the entire device.

[0131] The second prefabricated slot 4-2 is an arc-shaped slot that fits the Y-axis coil 2-2-2, which helps optimize the distribution of the electromagnetic field. By properly designing the shape and size of the arc-shaped slot, the electromagnetic field collected by the iron core can be distributed more evenly and reasonably on the inner side of the cover.

[0132] The outer walls of the housing 1 and the cover 4 are both rounded. This reduces the risk of injury to the user when touching or operating the device, while also reducing stress concentration caused by sharp edges. This helps to improve the structural strength of the housing 1 and the cover 4, making them more resistant to external impact or pressure, thereby extending the service life of the device.

[0133] The housing 1 and the cover 4 are both made of insulating plastic material, ensuring the safety of the staff when using the device.

[0134] The X-axis high magnetic permeability core 2-1-1 and the Y-axis high magnetic permeability core 2-2-1 are both made of high magnetic permeability materials, which makes it easy to collect the components of the magnetic field inside the metal shell of the transformer.

[0135] Both the X-axis coil 2-1-2 and the Y-axis coil 2-2-2 are made of copper. Copper is an excellent conductor, second only to silver in conductivity, resulting in low energy loss when conducting current. Furthermore, copper is chemically stable and resistant to oxidation and corrosion. In air, a dense oxide film forms on the copper surface, protecting the copper inside from further oxidation and extending the coil's lifespan. Copper also has high mechanical strength and can withstand significant mechanical stress, making it suitable for use in a variety of working environments. This ensures the copper coil maintains stable performance over long periods of use, reducing the frequency of repair and replacement.

[0136] The preferred embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the scope of the present invention.

[0137] Many other changes and modifications can be made without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A sensor for collecting magnetic fields inside the metal casing of a transformer. It is characterized by: comprising a housing (1), A collection device (2) is provided inside the housing (1). The collecting device (2) comprises an X-axis collecting component (2-1) and a Y-axis collecting component (2-2). A shielding device (3) is provided between the X-axis collecting component (2-1) and the Y-axis collecting component (2-2). The X-axis acquisition component (2-1) comprises an X-axis high-permeability iron core (2-1-1) for collecting the transverse component of the magnetic field inside the metal shell of the transformer, and an X-axis coil (2-1-2) for converting the transverse component of the magnetic field inside the metal shell of the transformer into a transverse current signal. The Y-axis acquisition component (2-2) comprises a Y-axis high-permeability iron core (2-2-1) for collecting the longitudinal component of the magnetic field inside the metal shell of the transformer, and a Y-axis coil (2-2-2) for converting the longitudinal component of the magnetic field inside the metal shell of the transformer into a longitudinal current signal. A cover (4) is provided at one end of the housing (1). The ends of the X-axis high magnetic permeability iron core (2-1-1) and the Y-axis high magnetic permeability iron core (2-2-1) and the other end of the shell (1) are arranged on the same plane. A signal line interface (5) for outputting a transverse current signal and a longitudinal current signal is provided on the side of the housing (1).

2. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 1, It is characterized by: The X-axis high magnetic permeability iron core (2-1-1) includes a second iron core (2-1-1-2), one end of the second iron core (2-1-1-2) is connected to the first iron core (2-1-1-1), and the other end of the second iron core (2-1-1-2) is connected to the third iron core (2-1-1-3), the first iron core (2-1-1-1) and the third iron core (2-1-1-3) are arranged in parallel, and the second iron core (2-1-1-2) is perpendicular to the first iron core (2-1-1-1) and the third iron core (2-1-1-3). The X-axis coil (2-1-2) is wound around the outside of the second iron core (2-1-1-2). The Y-axis high magnetic permeability iron core (2-2-1) includes a fifth iron core (2-2-1-2), one end of the fifth iron core (2-2-1-2) is connected to the fourth iron core (2-2-1-1), the other end of the fifth iron core (2-2-1-2) is connected to the sixth iron core (2-2-1-3), the fourth iron core (2-2-1-1) and the sixth iron core (2-2-1-3) are arranged in parallel, and the fifth iron core (2-2-1-2) is perpendicular to the fourth iron core (2-2-1-1) and the sixth iron core (2-2-1-3). The Y-axis coil (2-2-2) is wound around the outside of the fifth iron core (2-2-1-2).

3. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 2, It is characterized by: The shielding device (3) is a solid rectangular parallelepiped. The shielding device (3) is provided with a prefabricated hole (3-1) for placing the X-axis coil (2-1-2) and a first prefabricated groove (3-2) for placing the Y-axis coil (2-2-2).

4. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 3, It is characterized by: The housing (1) is provided with a fixing groove for fixing the collecting device (2) and the shielding device (3). The fixed slots include a first fixed slot (1-1-1), a second fixed slot (1-1-2), a third fixed slot (1-1-3), a fourth fixed slot (1-1-4) and a fifth fixed slot (1-1-5), The first fixing groove (1-1-1) is used to place the first iron core (2-1-1-1), The second fixing groove (1-1-2) is used to place the third iron core (2-1-1-3). The third fixing groove (1-1-3) is used to place the fourth iron core (2-2-1-1). The fourth fixing groove (1-1-4) is used to place the sixth iron core (2-2-1-3). The fifth fixing slot (1-1-5) is used to place the shielding device (3), the second iron core (2-1-1-2), the X-axis coil (2-1-2), the fifth iron core (2-2-1-2) and the Y-axis coil (2-2-2).

5. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 4, It is characterized by: The first iron core (2-1-1-1), the second iron core (2-1-1-2), the third iron core (2-1-1-3), the fourth iron core (2-2-1-1), the fifth iron core (2-2-1-2) and the sixth iron core (2-2-1-3) all adopt a rectangular columnar structure.

6. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 5, It is characterized by: A second prefabricated groove (4-2) for placing the Y-axis coil (2-2-2) is provided on the inner side of the cover body (4).

7. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 6, It is characterized by: The second prefabricated groove (4-2) is an arc-shaped groove that fits the Y-axis coil (2-2-2).

8. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 7, It is characterized by: The outer wall of the shell (1) and the outer wall of the cover (4) are both provided with rounded corners.

9. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 3, It is characterized by: The shell (1) and the cover (4) are both made of insulating plastic material.

10. A transformer housing metal internal magnetic field acquisition sensor as claimed in claim 9, It is characterized by: The X-axis high magnetic permeability iron core (2-1-1) and the Y-axis high magnetic permeability iron core (2-2-1) are both made of high magnetic permeability materials. The X-axis coil (2-1-2) and the Y-axis coil (2-2-2) are both made of copper.

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