Arrangement method of electric field and magnetic field sensor probes in converter transformer

Abstract

The invention belongs to the field of state monitoring of high-voltage direct-current transmission equipment, and relates to a method for arranging electric field and magnetic field sensor probes in a converter transformer, which comprises the following steps of: packaging an electro-optical crystal into an electric field sensor probe by using an insulating shell, and packaging a magneto-optical crystal into a magnetic field sensor probe; selecting candidate point locations capable of accommodating the electric field sensor probe and the magnetic field sensor probe in the converter transformer according to the sizes of the electric field sensor probe and the magnetic field sensor probe; performing electric field simulation on the candidate point locations to obtain electric field distribution of the candidate point locations without the sensor probes and electric field distribution of the candidate point locations with the sensor probes; and comparing the electric field distribution curves of the candidate point positions with or without the electric field sensor probes, and selecting the candidate point positions of which the electric field distortion does not exceed the safety upper limit as the arrangement point positions of the sensor probes. The arrangement point positions of the sensor probes are determined through electric field simulation, and the technical problems that in the prior art, the layout of the sensor probes conflicts, and the anti-interference performance is poor are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage direct current transmission equipment status monitoring, and specifically relates to a method for arranging electric field and magnetic field sensor probes inside a converter transformer, which is suitable for online monitoring of the electric field and magnetic field of an ultra-high voltage converter transformer. Background Art

[0002] Converter transformers are core components of DC transmission systems. Electric field distortion and magnetic flux concentration within them can easily lead to insulation failure. Traditional electric and magnetic field sensor probes contain metal components and cannot be used inside converter transformers, making it difficult to directly measure the electric and magnetic fields within them.

[0003] Among the new sensors, optical electric field sensors and magneto-optical sensors perform measurements based on the photoelectric effect and magneto-optical effect. Their sensor probes can be manufactured into fully insulated types, making them promising for use inside converter transformers. Currently, the application of fully insulated electromagnetic probes inside converter transformers presents the following technical challenges:

[0004] 1. Traditional probes are mostly concentrated in a single area (such as the middle of the winding), making it difficult to capture sudden changes in field strength at key locations such as corner rings and core legs. 2. Because the dielectric constant of the probe material is different from that of the transformer oil and insulating paper, placing a probe inside the converter transformer may cause distortion of the electric field near the probe, which not only affects the accuracy of the measurement results but also increases the risk of partial discharge. 3. Influences such as vibration and oil flow inside the converter transformer may cause the probe to be loosely fixed, easily falling off, and affecting measurements. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a method for arranging probes of electric field and magnetic field sensors inside a converter transformer. The technical solution adopted by the present invention is as follows:

[0006] A method for arranging electric field and magnetic field sensor probes inside a converter transformer comprises the following steps:

[0007] Step 1: Encapsulate the electro-optical crystal into an electric field sensor probe using an insulating shell, and encapsulate the magneto-optical crystal into a magnetic field sensor probe using an insulating shell;

[0008] Step 2: Arrange the electric field sensor probe:

[0009] According to the size of the electric field sensor probe, select candidate points inside the converter transformer that can accommodate the electric field sensor probe;

[0010] Performing electric field simulation on candidate points of the electric field sensor probe to obtain the electric field distribution of the candidate points without the electric field sensor probe and the electric field distribution of the candidate points with the electric field sensor probe installed;

[0011] Comparing the candidate points of the electric field sensor probe with and without the electric field distribution curve of the electric field sensor probe, and selecting the candidate points where the electric field distortion does not exceed the safety upper limit as the arrangement points of the electric field sensor probe;

[0012] Use epoxy resin glue to glue the insulating shell of the electric field sensor probe to the surface of the location where the electric field sensor probe is arranged;

[0013] Step 3: Arrange the magnetic field sensor probe:

[0014] According to the size of the magnetic field sensor probe, a candidate point that can accommodate the magnetic field sensor probe is selected inside the converter transformer;

[0015] Performing electric field simulation on candidate points of the magnetic field sensor probe to obtain the electric field distribution of the candidate points without the magnetic field sensor probe and the electric field distribution of the candidate points with the magnetic field sensor probe installed;

[0016] Comparing candidate points of the magnetic field sensor probe with and without the electric field distribution curve of the magnetic field sensor probe, and selecting candidate points where the electric field distortion does not exceed the safety upper limit as the arrangement points of the magnetic field sensor probe;

[0017] The insulating shell of the magnetic field sensor probe is bonded to the surface of the arrangement point of the magnetic field sensor probe by using epoxy resin glue.

[0018] Preferably, the arrangement points of the electric field sensor probe include: the upper part of the left side column winding, above the left side column corner ring, the upper part of the left middle column winding, above the left middle column corner ring, the upper part of the right middle column winding, above the right middle column corner ring, the upper part of the right side column winding and above the right side column corner ring.

[0019] Preferably, a parallel plate uniform electric field is constructed to calibrate the electric field sensor probe and determine the response coefficient of the electric field sensor probe.

[0020] Preferably, a layered insulating cardboard is used as a dielectric carrier to simulate the main insulation structure of a converter transformer; a multi-layer copper foil winding is wound on the surface of the layered insulating cardboard to form a typical layered winding structure, the number of winding turns is proportionally scaled, and an industrial frequency voltage is applied to establish an equivalent electric field distribution; an electric field sensor probe is embedded in a hole in the maximum field strength area between the winding layers, and the measurement results after arranging the electric field sensor probe are compared with the finite element simulation results to verify the measurement accuracy of the electric field sensor probe.

[0021] Preferably, the arrangement points of the magnetic field sensor probe include: the right side of the left side column iron core column, both sides of the left middle column iron core column, both sides of the right middle column iron core column and the lower left side of the right side column iron core column.

[0022] Preferably, a cross section is selected from the front, middle and rear of the magnetic field sensor probe, and electric field strength simulation is performed on each cross section.

[0023] Preferably, the magnetic field strength measured by the magnetic field sensor probe is converted into actual magnetic field strength.

[0024] Preferably, the insulating shell includes an insulating paper block and insulating cardboard of suitable size. The insulating paper block is a rectangular structure made by gluing together multiple layers of insulating cardboard. A groove for accommodating the electro-optical crystal or magneto-optical crystal is dug out on the insulating paper block. The electro-optical crystal or magneto-optical crystal is placed in the groove. The connecting wire of the electro-optical crystal or magneto-optical crystal passes through the insulating paper block and is electrically connected to both ends of the electro-optical crystal or magneto-optical crystal respectively. The insulating cardboard and the insulating paper block are glued together to wrap the electro-optical crystal or magneto-optical crystal.

[0025] Preferably, a cylindrical plastic shell is wrapped around the periphery of the magneto-optical crystal.

[0026] Beneficial effects of the present invention:

[0027] The present invention determines the layout points of electric field sensor probes and magnetic field sensor probes through electric field simulation, solving the technical problems of sensor probe layout conflicts and poor anti-interference performance in the prior art, and significantly improving the monitoring accuracy and equipment safety of the electric field strength and magnetic field strength inside the converter transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a flow chart of arranging electric field sensor probes according to the first embodiment of the present invention;

[0030] Figure 2 This is a flow chart of arranging magnetic field sensor probes according to the first embodiment of the present invention;

[0031] Figure 3 A front view of the arrangement position of the sensor probe according to the first embodiment of the present invention;

[0032] Figure 4 A cross-sectional view showing the arrangement of the sensor probe according to the first embodiment of the present invention;

[0033] Figure 5 for Figure 3 A partial enlarged view of the arrangement positions of the corner ring electric field sensor probe 1 and the winding electric field sensor probe 1;

[0034] Figure 6 This is an electric field simulation diagram of the arrangement of electric field sensor probes according to the first embodiment of the present invention. Figure 6-1 This is the electric field simulation diagram at the upper corner ring of the winding. Figure 6-2 This is the electric field simulation diagram at the side of the upper end of the winding;

[0035] Figure 7 Schematic diagram of constructing a parallel plate uniform electric field according to the first embodiment of the present invention;

[0036] Figure 8 This is an electric field simulation diagram of an electric field sensor probe installed at the winding below the corner ring in embodiment 1 of the present invention;

[0037] Figure 9 This is an electric field simulation diagram with and without a magnetic field sensor probe according to the first embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the magnetic induction intensity of the magnetic field sensor probe installed in the first embodiment of the present invention;

[0039] Figure 11 This is a schematic diagram of the actual magnetic field strength conversion principle of the first embodiment of the present invention;

[0040] Figure 12 This is an exploded schematic diagram of a slotted paper block and an insulating paperboard according to a second embodiment of the present invention;

[0041] Figure 13 This is a cross-sectional view of an electro-optical crystal according to a second embodiment of the present invention installed in a slotted paper block;

[0042] Among them, 101-left side column winding, 102-left side column iron core column, 103-left side column angle ring, 104-winding electric field sensor probe 1, 105-angle ring electric field sensor probe 1;

[0043] 201-left center column winding, 202-left center column iron core, 203-left center column angle ring, 204-winding electric field sensor probe 2, 205-angle ring electric field sensor probe 2;

[0044] 301-right center column winding, 302-right center column iron core column, 303-right center column angle ring, 304-winding electric field sensor probe three, 305-angle ring electric field sensor probe three;

[0045] 401-right side column winding, 402-right side column iron core column, 403-right side column angle ring, 404-winding electric field sensor probe four, 405-angle ring electric field sensor probe four;

[0046] 501-magnetic field sensor probe one, 502-magnetic field sensor probe two, 503-magnetic field sensor probe three, 504-magnetic field sensor probe four, 505-magnetic field sensor probe five, 506-magnetic field sensor probe six;

[0047] 601-insulating paper block, 602-insulating cardboard, 603-electro-optical crystal, 604-electro-optical crystal connecting wire. DETAILED DESCRIPTION

[0048] Specific embodiments of the present invention will be described in detail below. Although specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0049] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the invention. The scope of protection of the present invention shall be as defined in the attached claims.

[0050] To facilitate understanding of the embodiments of the present invention, further explanation will be given below using specific embodiments as examples in conjunction with the accompanying drawings, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0051] Example 1

[0052] like Figure 1-11 As shown, a method for arranging electric field and magnetic field sensor probes of a converter transformer includes the following steps:

[0053] Step 1: Encapsulate the electro-optical crystal 603 into an electric field sensor probe using an insulating housing, and encapsulate the magneto-optical crystal into a magnetic field sensor probe using an insulating housing;

[0054] Step 2: Arrange the electric field sensor probe:

[0055] S21 . Select candidate locations inside the converter transformer that can accommodate the electric field sensor probe according to the size of the electric field sensor probe after the electro-optical crystal 603 is packaged.

[0056] S22 , performing electric field simulation on each candidate point to obtain the electric field distribution of the candidate point without the electric field sensor probe and the electric field distribution of the candidate point after the electric field sensor probe is installed.

[0057] S23. Compare the candidate points with or without the electric field distribution curves of the electric field sensor probe, and select the candidate points where the electric field distortion does not exceed the insulation safety upper limit as the locations for arranging the electric field sensor probe.

[0058] Since the electric field sensor probe is a fully insulated structure, it is not easily magnetized and will not affect the surrounding magnetic field distribution. However, since the dielectric constant of the material is different from that of oil and insulating paper, it may affect the electric field distribution and cause a certain degree of distortion in the electric field. Figure 6 As shown in the figure, electric field simulation results show that placement of electric field sensor probes at the upper corner ring and the side of the upper end of the winding results in minimal electric field distortion. Different converter transformer manufacturers have slightly different insulation requirements, but generally require an upper limit of no more than 2kV / mm. Simulation results show that the change in electric field after placement of the electric field sensor probes is less than the safe upper limit and does not affect the insulation performance of the converter transformer.

[0059] Specifically, the layout points of the electric field sensor probes selected through electric field simulation include: the upper part of the left side pillar winding 101, above the left side pillar angle ring 103, the upper part of the left middle pillar winding 201, above the left middle pillar angle ring 203, the upper part of the right middle pillar winding 301, above the right middle pillar angle ring 303, the upper part of the right side pillar winding 401 and above the right side pillar angle ring 403. Winding electric field sensor probe 104 is fixedly installed on the upper part of the left side column winding 101, and angle ring electric field sensor probe 105 is fixedly installed above the left side column angle ring 103; winding electric field sensor probe 204 is fixedly installed on the upper part of the left middle column winding 201, and angle ring electric field sensor probe 205 is fixedly installed above the left middle column angle ring 203; winding electric field sensor probe 304 is fixedly installed on the upper part of the right middle column winding 301, and angle ring electric field sensor probe 305 is fixedly installed above the right middle column angle ring 303; winding electric field sensor probe 404 is fixedly installed on the upper part of the right side column winding 401, and angle ring electric field sensor probe 405 is fixedly installed above the right side column angle ring 403.

[0060] S24. Construct a parallel plate uniform electric field to calibrate the electric field sensor probe and determine the response coefficient of the electric field sensor probe. Figure 7 In the figure, E represents the electric field, and the arrow indicates the direction of the electric field. The electric field sensor probe of the first embodiment of the present invention is packaged using an electro-optical crystal 603. Due to differences in processing techniques, errors, and other factors, the response coefficient of the electric field sensor probe may vary. Therefore, the response coefficient of the electric field sensor probe must be calibrated in advance. The proportional relationship between the magnitude of the electrical signal output by the electric field sensor probe and the magnitude of the measurement result (i.e., the actual electric field) is called the response coefficient. The electric field curve is obtained by multiplying the waveform curve of the electrical signal output by the electric field sensor probe by the response coefficient. In other words, all measurement results in the embodiments of the present invention implicitly use the response coefficient.

[0061] S25. Construct a simplified winding-cardboard model. The model's structure and installation location are identical to the locations of the electric field sensor probes within the converter transformer. Test the model and compare the measurement results after the electric field sensor probes are deployed with the finite element simulation results to verify the measurement accuracy of the electric field sensor probes. After embedding the electric field sensor probes in the simplified winding-cardboard model, perform measurements and compare the measurement results of the electric field sensor probes (i.e., the measurement results of the simplified model) with the finite element simulation results to verify the measurement accuracy of the electric field sensor probes. If the two results are close, the measurement accuracy of the electric field sensor probes is acceptable.

[0062] Specifically, layered insulating cardboard is used as a dielectric carrier to simulate the main insulation structure of the converter transformer; multiple layers of copper foil windings are wound on the surface of the layered insulating cardboard to form a typical layered winding structure. The number of winding turns is scaled proportionally, and an industrial frequency voltage is applied to establish an equivalent electric field distribution; holes are opened at key positions between winding layers (maximum field strength areas) to embed electric field sensor probes.

[0063] After verification, after the measurement accuracy of the electric field sensor probe meets the measurement requirements, the actual method of installing the electric field sensor probe inside the converter transformer is: use epoxy resin glue to glue the insulating shell of the electric field sensor probe to the surface of the selected electric field sensor probe layout point, and the electric field sensor probe measures the electric field strength in the direction perpendicular to the surface at the location. The electric field strength in the direction perpendicular to the surface is the electric field strength at that location.

[0064] Since the electric field near the metal conductor is perpendicular to the surface, it is only necessary to measure the electric field perpendicular to the surface. Figure 8 It can be proved that this method is feasible. Figure 8 The figure is a schematic diagram of the radial and axial components of the electric field at the winding below the corner ring. It can be seen that the radial electric field strength is in the range of 2.0 to 2.8 kV / mm, while the axial electric field strength is in the range of 0.02 to 0.08 kV / mm. The axial electric field strength is much smaller than the radial electric field strength and can be ignored. Therefore, the radial (perpendicular to the surface) electric field strength is the electric field strength at this location.

[0065] Step 3: Arrange the magnetic field sensor probe:

[0066] S31. Select candidate locations inside the converter transformer that can accommodate the magnetic field sensor probe based on the size of the magnetic field sensor probe after the magneto-optical crystal is packaged.

[0067] S32 , performing electric field simulation on each candidate point to obtain the electric field distribution of the candidate point without the magnetic field sensor probe and the electric field distribution of the candidate point after the magnetic field sensor probe is installed.

[0068] S33. Compare the candidate points with or without the electric field distribution curves of the magnetic field sensor probe, and select the candidate points where the electric field distortion does not exceed the insulation safety upper limit as the locations for arranging the magnetic field sensor probe.

[0069] In the first embodiment, a cross section is selected from the front, middle, and rear of the magnetic field sensor probe, and electric field intensity simulation is performed on each cross section. Figure 9 The electric field curves of the front, middle, and rear sections of the magnetic field sensor probe are shown, along with schematic diagrams of the locations of the simulated sections. It can be seen that the degree of electric field distortion is small before and after the magnetic field sensor probe is placed, and will not affect the insulation performance of the converter transformer.

[0070] Specifically, the locations for the magnetic field sensor probes selected through electric field simulation include the right side (inner side) of the left side pillar iron core 102, both sides of the left center pillar iron core 202, both sides of the right center pillar iron core 302, and the lower left side (inner side) of the right side pillar iron core 402. Magnetic field sensor probe one 501 is arranged on the lower right side surface of the left side pillar iron core 102, magnetic field sensor probe two 502 and magnetic field sensor probe three 503 are arranged on the lower right sides of the left center pillar iron core 202, magnetic field sensor probe four 504 and magnetic field sensor probe five 505 are arranged on the lower right sides of the right side pillar iron core 402, and magnetic field sensor probe six 506 is arranged on the lower left side surface of the right side pillar iron core 402.

[0071] S34. Convert the magnetic field strength measured by the magnetic field sensor probe into the actual magnetic field strength.

[0072] Since the magnetic field sensor probe can only measure the magnetic field in one direction, it is necessary to consider the magnetic field distribution characteristics at the measurement point and how to use a magnetic field sensor probe to measure the magnetic field. Figure 10 The left picture shows the magnetic field when the magnetic field sensor probe is set in the middle of the iron core column. Figure 10 The figure on the right shows the magnetic field when the magnetic field sensor probe is set at the bottom of the lower part of the core column. It can be seen that the magnetic field in the middle of the converter transformer winding has only an axial component, so the magnetic field sensor probe only needs to be arranged axially in the middle; but at the end and bottom, the magnetic field has both axial and radial components. When measuring the axial component, the magnetic field sensor probe only needs to be arranged axially, but when measuring the radial component, simulation calculation is required to obtain the actual magnetic field. The specific steps include:

[0073] ① Such as Figure 11 As shown: an intercept point is selected at the end of the core, and the radial magnetic field B at this point is obtained by simulation (the electromagnetic field simulation generally adopts the finite element method, and there are many simulation software that can be used, including ANSYS Maxwell, Comsol, etc.);

[0074] ②Calculated by trigonometric formula:

[0075]

[0076] Where α is the angle between the radial magnetic field B and the x-axis, B y is the y-direction component of the radial magnetic field at that point; B x is the x-direction component of the radial magnetic field at that point.

[0077] ③ If the magnetic field sensor probe is Figure 11 The angle β shown is arranged radially. β is the angle between the magnetic field sensor probe and the x-axis. From the analysis of the angle, it can be seen that the angle between B1 and B is β-α, so the following can be obtained by calculation:

[0078] B=B1 / cos(β-α)

[0079] B1 is measured directly by the magnetic field sensor probe. Angle β is determined by the probe's orientation, and β is a known parameter. Angle α is obtained from electromagnetic field simulation, see ①. B is the actual radial magnetic field, calculated using B = B1 / cos(β - α).

[0080] By using the above method, a magnetic field sensor probe is used to be radially arranged at an arbitrary angle during actual measurement, and the actual magnetic field intensity at the arrangement point can be calculated from the measured value.

[0081] It can be seen that the electric field and magnetic field sensor probe arrangement method provided in Example 1 of the present invention can realize the measurement of the electric field and magnetic field inside the converter transformer, and solve the technical problems of unreasonable sensor probe arrangement points and loose fixation of sensor probes in the electric field and magnetic field monitoring of the converter transformer in the prior art.

[0082] Example 2

[0083] like Figure 12 、 13 As shown, the electric field sensor probe in the first embodiment is manufactured as follows:

[0084] Multiple layers of insulating cardboard are bonded together to form an insulating paper block 601 with a rectangular structure. A rectangular slot is cut out on the insulating paper block 601, and an electro-optical crystal 603 is placed in the rectangular slot. A piece of insulating cardboard 602 is placed on top of the rectangular slot. The size of the insulating cardboard 602 matches the surface size of the insulating paper block 601, and the insulating cardboard 602 and the insulating paper block 601 are firmly bonded together. The electric field sensor probe connection wires 604 on both sides pass through the insulating paper block 601 and are electrically connected to the two ends of the electro-optical crystal 603. By setting up the insulating cardboard 602 and the insulating paper block 601, the electro-optical crystal 603 is encapsulated.

[0085] The electro-optical crystal 603 has a square column structure with a size of 3 mm×3 mm×10 mm. The electric field sensor probe after the insulating paperboard 602 and the insulating paper block 601 are bonded together has a rectangular parallelepiped structure with a size of 10 mm×10 mm×30 mm.

[0086] The magneto-optical crystal has a square cylindrical structure with a size of 3mm×3mm×10mm, and the outer periphery of the magneto-optical crystal is wrapped with a cylindrical plastic shell with a diameter of 9mm, and the cylindrical plastic shell is further enclosed in a rectangular structure consisting of insulating cardboard 602 and insulating paper block 601. The packaging and manufacturing method of the insulating structure of the magnetic field sensor probe is the same as that of the electric field sensor probe, and will not be repeated here.

[0087] By encapsulating the electro-optic crystal 603 and the magneto-optical crystal in a rectangular insulating shell, and then firmly gluing the rectangular insulating shell to the inside of the converter transformer, the rectangular insulating shell completely wraps the sensor probe, thereby preventing the sensor probe from swinging due to the influence of oil flow.

[0088] In the embodiments of the present invention, technical features not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

Claims

1. A method for arranging electric field and magnetic field sensor probes inside a converter transformer, characterized in that: The following steps are involved: Step 1: Encapsulate the electro-optical crystal into an electric field sensor probe using an insulating shell, and encapsulate the magneto-optical crystal into a magnetic field sensor probe using an insulating shell; Step 2: Arrange the electric field sensor probe: According to the size of the electric field sensor probe, select candidate points inside the converter transformer that can accommodate the electric field sensor probe; Performing electric field simulation on candidate points of the electric field sensor probe to obtain the electric field distribution of the candidate points without the electric field sensor probe and the electric field distribution of the candidate points with the electric field sensor probe installed; Comparing the candidate points of the electric field sensor probe with and without the electric field distribution curve of the electric field sensor probe, and selecting the candidate points where the electric field distortion does not exceed the safety upper limit as the arrangement points of the electric field sensor probe; Use epoxy resin glue to glue the insulating shell of the electric field sensor probe to the surface of the location where the electric field sensor probe is arranged; Step 3: Arrange the magnetic field sensor probe: According to the size of the magnetic field sensor probe, a candidate point that can accommodate the magnetic field sensor probe is selected inside the converter transformer; Performing electric field simulation on candidate points of the magnetic field sensor probe to obtain the electric field distribution of the candidate points without the magnetic field sensor probe and the electric field distribution of the candidate points with the magnetic field sensor probe installed; Comparing candidate points of the magnetic field sensor probe with and without the electric field distribution curve of the magnetic field sensor probe, and selecting candidate points where the electric field distortion does not exceed the safety upper limit as the arrangement points of the magnetic field sensor probe; The insulating shell of the magnetic field sensor probe is bonded to the surface of the arrangement point of the magnetic field sensor probe by using epoxy resin glue.

2. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 1, characterized in that: The arrangement points of the electric field sensor probe include: the upper part of the left side column winding, above the left side column corner ring, the upper part of the left middle column winding, above the left middle column corner ring, the upper part of the right middle column winding, above the right middle column corner ring, the upper part of the right side column winding and above the right side column corner ring.

3. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 2, characterized in that: A parallel plate uniform electric field is constructed to calibrate the electric field sensor probe and determine the response coefficient of the electric field sensor probe.

4. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 3, characterized in that: Layered insulating cardboard is used as the dielectric carrier to simulate the main insulation structure of the converter transformer. Multi-layer copper foil windings are wound on the surface of the layered insulating cardboard to form a typical layered winding structure. The number of winding turns is proportionally reduced, and an industrial frequency voltage is applied to establish an equivalent electric field distribution. Electric field sensor probes are embedded in holes in the maximum field strength area between the winding layers. The measurement results after the electric field sensor probes are arranged are compared with the finite element simulation results to verify the measurement accuracy of the electric field sensor probes.

5. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 1, characterized in that: The arrangement points of the magnetic field sensor probe include: the right side of the left side column iron core column, both sides of the left middle column iron core column, both sides of the right middle column iron core column and the lower left side of the right side column iron core column.

6. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 5, characterized in that: A cross section is selected at the front, middle, and rear of the magnetic field sensor probe, and the electric field strength simulation is performed separately.

7. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 6, characterized in that: Convert the magnetic field strength measured by the magnetic field sensor probe into the actual magnetic field strength.

8. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 1, characterized in that: The insulating shell includes an insulating paper block and insulating cardboard of appropriate size. The insulating paper block is a rectangular structure made by gluing together multiple layers of insulating cardboard. A groove for accommodating the electro-optical crystal or magneto-optical crystal is dug out on the insulating paper block. The electro-optical crystal or magneto-optical crystal is placed in the groove. The connecting wire of the electro-optical crystal or magneto-optical crystal passes through the insulating paper block and is electrically connected to both ends of the electro-optical crystal or magneto-optical crystal respectively. The insulating cardboard and the insulating paper block are glued together to wrap the electro-optical crystal or magneto-optical crystal.

9. The method for arranging electric field and magnetic field sensor probes inside a converter transformer according to claim 8, characterized in that: A cylindrical plastic shell is wrapped around the outer periphery of the magneto-optical crystal.

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