Method and device for locating target point and method for determining discharge point

Abstract

The present invention discloses a method for locating a target point, comprising the following steps: obtaining a balance point on any plane, and obtaining a distance value between the balance point and the target point, wherein the balance point is the point on the plane with the smallest distance from the target point; setting a first rectangular coordinate system in the plane with the balance point as the coordinate origin, and setting at least one reference point on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and obtaining a distance value between the reference point and the target point; determining the coordinates of the target point based on the balance point, the reference point, the distance value between the balance point and the target point, and the distance value between the reference point and the target point. The present invention also discloses a method for determining a discharge point in a transformer comprising the method for locating a target point, and a device for locating a target point. The method for locating a target point of the present invention is simple to operate, can shorten the positioning time, reduce the positioning processing cycle, and reduce energy consumption.

Description

Technical Field

[0001] The present invention particularly relates to a method for locating a target point, a method for determining a discharge point in a transformer comprising the method for locating the target point, and a device for locating the target point. Background Art

[0002] In the existing technology, the minimum delay method (V-shaped curve method), the triangle electro-acoustic time delay positioning method (spherical positioning method), the multi-point electro-acoustic time delay positioning method (spherical positioning method), and the multi-point electro-acoustic time delay positioning (spherical positioning method) are often used to ultrasonically locate the local discharge point. However, the above methods are complicated to operate and highly professional. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art and provide a method for locating a target point and a method for determining a discharge point in a transformer comprising the method for locating a target point, as well as a device for locating a target point. The method for locating a target point is simple to operate, can shorten the positioning time, reduce the positioning processing cycle, and reduce energy consumption.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A method for locating a target point comprises the following steps:

[0006] Obtaining a balance point on any plane and obtaining a distance value between the balance point and a target point, wherein the balance point is the point on the plane with the smallest distance from the target point;

[0007] A first rectangular coordinate system is set in the plane with the balance point as the coordinate origin, and at least one reference point is set on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and the distance value between the reference point and the target point is obtained;

[0008] The coordinates of the target point are determined according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

[0009] Preferably, the coordinates of the target point are determined according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point, specifically including:

[0010] Starting from the coordinate origin of the first rectangular coordinate system, set the Y axis in the direction perpendicular to the X axis and Z axis of the first rectangular coordinate system, and set the plane where the X axis and Y axis are located as the first plane, and the plane where the Y axis and Z axis are located as the second plane, and the second plane is perpendicular to the first plane.

[0011] Set the reference point on the X-axis of the first rectangular coordinate system as the first reference point, and the reference point on the Z-axis of the first rectangular coordinate system as the second reference point.

[0012] A first arc is drawn on the first plane with the first reference point on the X-axis of the first rectangular coordinate system as the center of the circle and the distance between the first reference point and the target point as the radius. Also, a second arc is drawn on the first plane with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius. The intersection of the first arc and the second arc is the position of the target point in the first plane.

[0013] Preferably, determining the coordinates of the target point based on the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point further includes:

[0014] With the second reference point on the Z axis of the first rectangular coordinate system as the center of the circle and the distance between the second reference point and the target point as the radius, a third arc is drawn on the second plane. Also, with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius, a fourth arc is drawn on the second plane. The intersection of the third arc and the fourth arc is the position of the target point in the second plane.

[0015] Preferably, determining the coordinates of the target point based on the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point further includes:

[0016] The coordinate origin is selected again in the plane where the first rectangular coordinate system is located, and a second rectangular coordinate system is established in the plane, wherein the X' axis of the second rectangular coordinate system is parallel to the X axis, and the Z' axis is parallel to the Z axis. The coordinates of each first reference point, second reference point, and balance point in the second rectangular coordinate system are measured, and the coordinates of the target point are obtained by combining the position of the target point in the first plane and the second plane.

[0017] Preferably, the equilibrium point on any plane is obtained as follows:

[0018] S1: Setting a first straight line in a first direction on any plane, selecting a plurality of first detection points on the first straight line, and measuring the distance between the first detection points and the target point using an ultrasonic probe to determine the point on the first straight line closest to the target point, which is the first determined point;

[0019] S2: Selecting a second direction on the plane, the second direction being perpendicular to the first direction, and setting a second straight line in the second direction, establishing a rectangular coordinate system with the first determined point as the coordinate origin and the first straight line and the second straight line as two coordinate axes, selecting a plurality of second detection points on the second straight line on both sides of the first determined point, and measuring the distances between the second detection points and the target point using an ultrasonic probe to determine the point on the second straight line that is closest to the target point, which is the second determined point;

[0020] S3: If the distance between the second determined point and the target point is equal to the distance between the first determined point and the target point, then the first determined point is determined as the equilibrium point;

[0021] If the distance between the second determined point and the target point is less than the distance between the first determined point and the target point, the second determined point is used as the coordinate origin, a third straight line is set in the first direction, a rectangular coordinate system is established with the second straight line and the third straight line as two coordinate axes, and multiple third detection points are selected on the third straight line on both sides of the second determined point. The distance between them and the target point is measured by an ultrasonic probe to determine the point on the third straight line that is closest to the target point. This point is the reset first determined point, and steps S2 and S3 are repeated until the balance point is obtained.

[0022] Preferably, before step S1, the method further includes:

[0023] An ultrasonic probe is used to determine an effective detection area of ​​the ultrasonic probe on any selected plane, and the first straight line is set in the effective detection area.

[0024] Preferably, a first rectangular coordinate system is set in the plane with the balance point as the coordinate origin, and at least one reference point is set on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and the distance value between the reference point and the target point is obtained, specifically including:

[0025] A first rectangular coordinate system is set with the balance point as the coordinate origin, wherein at least one first reference point is set on each side of the coordinate origin on the X-axis of the first rectangular coordinate system, and the distance between each first reference point and the target point is measured by an ultrasonic probe to obtain the distance value between the first reference point and the target point, and

[0026] At least one second reference point is set on the Z axis of the first rectangular coordinate system of the plane and on both sides of the coordinate origin. The distance between each second reference point and the target point is measured by an ultrasonic probe to obtain the distance value between the second reference point and the target point.

[0027] The present invention also provides a method for determining the discharge point in a transformer, which uses the above-mentioned method for locating the target point to locate the discharge point of the transformer.

[0028] The plane where the balance point is located is the wall surface of the transformer box, and the target point is the discharge point.

[0029] Preferably, before adopting the above-mentioned method of locating the target point to determine the discharge point of the transformer, the method further includes:

[0030] The position range of the discharge point in the transformer is predetermined by electrical positioning method.

[0031] The present invention also provides a device for locating a target point, comprising an acquisition module, a measurement module and a determination module.

[0032] The acquisition module is used to acquire a balance point on any plane and acquire a distance value between the balance point and a target point, wherein the balance point is the point on the plane with the smallest distance from the target point;

[0033] The measurement module is configured to set a first rectangular coordinate system in the plane with the balance point as the coordinate origin, set at least one reference point on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and obtain a distance value between the reference point and the target point;

[0034] The determination module is used to determine the coordinates of the target point according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

[0035] The method for locating a target point of the present invention obtains a balance point on any plane, and sets a first rectangular coordinate system with the balance point as the coordinate origin, and determines the coordinates of the target point according to a reference point set on the coordinate axis of the first rectangular coordinate system, the coordinate origin, the reference point, the distance between the coordinate origin and the target point, and the distance between the reference point and the target point. The operation steps are simple, which is convenient for users to master the skills and operation methods, and can shorten the positioning time, reduce the positioning processing cycle, and reduce energy consumption.

[0036] The method for determining the discharge point in the transformer of the present invention can quickly determine the position of the discharge point in the transformer by adopting the above-mentioned method for locating the target point, and accurately locates the discharge point, which can improve the accuracy of locating the discharge point and is suitable for detecting the discharge point when partial discharge anomalies occur in manufacturing plants and on-site equipment.

[0037] The device for locating a target point of the present invention has a simple structure, is easy to operate, and can quickly determine the target point. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the positions of measurement points on the transformer tank wall in an embodiment of the present invention;

[0039] Figure 2Schematic diagram of the distance between the first measuring point and the target point on the X-axis in an embodiment of the present invention;

[0040] Figure 3 Schematic diagram of the distance between the second measuring point and the target point on the Z axis in an embodiment of the present invention;

[0041] Figure 4 Schematic diagram of the xy coordinate position of a target point on the XY plane in an embodiment of the present invention;

[0042] Figure 5 Schematic diagram of the yz coordinate position of a target point on the YZ plane in an embodiment of the present invention;

[0043] Figure 6 This is a diagram of an ultrasound receiving signal in an embodiment of the present invention;

[0044] Figure 7 Schematic diagram of the xy coordinate position of a target point on the XY plane in an embodiment of the present invention;

[0045] Figure 8 Schematic diagram of the yz coordinate position of a target point on the YZ plane in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of the present invention.

[0047] The present invention provides a method for locating a target point, comprising the following steps:

[0048] Obtaining a balance point on any plane and obtaining a distance value between the balance point and a target point, wherein the balance point is the point on the plane with the smallest distance from the target point;

[0049] A first rectangular coordinate system is set in the plane with the balance point as the coordinate origin, and at least one reference point is set on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and the distance value between the reference point and the target point is obtained;

[0050] The coordinates of the target point are determined according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

[0051] The present invention also provides a method for determining the discharge point in a transformer, which uses the above-mentioned method for locating the target point to locate the discharge point of the transformer.

[0052] The plane where the balance point is located is the wall surface of the transformer box, and the target point is the discharge point.

[0053] The present invention also provides a device for locating a target point, comprising an acquisition module, a measurement module and a determination module.

[0054] The acquisition module is used to acquire a balance point on any plane and acquire a distance value between the balance point and a target point, wherein the balance point is the point on the plane with the smallest distance from the target point;

[0055] The measurement module is configured to set a first rectangular coordinate system in the plane with the balance point as the coordinate origin, set at least one reference point on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and obtain a distance value between the reference point and the target point;

[0056] The determination module is used to determine the coordinates of the target point according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

[0057] Example 1:

[0058] This embodiment discloses a method for ultrasonically locating a discharge point, comprising the following steps:

[0059] Get the equilibrium point on any plane and the distance between the equilibrium point and the target point. The equilibrium point is the point on the plane with the smallest distance to the target point.

[0060] Get the equilibrium point on any plane, specifically:

[0061] S1: Set a first straight line in a first direction on any plane, and select multiple first detection points on the first straight line. Use an ultrasonic probe to measure the distance between them and the target point to determine the point on the first straight line that is closest to the target point. This point is the first determined point.

[0062] S2: Select a second direction on the plane, the second direction is perpendicular to the first direction, and set a second straight line in the second direction. Take the first determined point as the coordinate origin and the first straight line and the second straight line as the two coordinate axes to establish a rectangular coordinate system. Select multiple second detection points on the second straight line on both sides of the first determined point, and measure the distance between them and the target point with an ultrasonic probe to determine the point on the second straight line that is closest to the target point. This point is the second determined point.

[0063] S3: If the distance between the second determined point and the target point is equal to the distance between the first determined point and the target point, the first determined point is determined to be the equilibrium point;

[0064] If the distance between the second determined point and the target point is less than the distance between the first determined point and the target point, the second determined point is used as the coordinate origin, a third straight line is set in the first direction, a rectangular coordinate system is established with the second straight line and the third straight line as two coordinate axes, and multiple third detection points are selected on the third straight line on both sides of the second determined point. The distance between them and the target point is measured by an ultrasonic probe to determine the point on the third straight line that is closest to the target point. This point is the reset first determined point, and steps S2 and S3 are repeated until the balance point is obtained.

[0065] Preferably, before step S1, the method further includes:

[0066] An ultrasonic probe is used to determine an effective detection area of ​​the ultrasonic probe on any selected plane, and a first straight line is set in the effective detection area.

[0067] like Figure 1 As shown, with the balance point as the coordinate origin, a first rectangular coordinate system is set in the plane, and at least one reference point is set on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and the distance value between the reference point and the target point is obtained.

[0068] Specifically, a first rectangular coordinate system is set with the balance point as the coordinate origin, wherein at least one first reference point is set on each side of the coordinate origin on the X-axis of the first rectangular coordinate system, such as Figure 2 As shown, the distance between each first reference point and the target point is measured by an ultrasonic probe to obtain the distance value between the first reference point and the target point.

[0069] On the Z axis of the first rectangular coordinate system in the plane, at least one second reference point is set on both sides of the coordinate origin, such as Figure 3 As shown, the distance between each second reference point and the target point is measured by an ultrasonic probe to obtain the distance value between the second reference point and the target point.

[0070] In this embodiment, a reference point is set on the X-axis and Z-axis, and on both sides of the coordinate origin, for five-point positioning (the five points are: two points on both sides of the coordinate origin on the X-axis; two points on both sides of the coordinate origin on the Z-axis, and the coordinate origin).

[0071] In this embodiment, the plane is set as a vertical plane, the X-axis is set in the horizontal direction of the vertical plane, and the Z-axis is set in the vertical direction of the vertical plane.

[0072] The coordinates of the target point are determined according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

[0073] Starting from the coordinate origin of the first rectangular coordinate system, the Y axis is set in a direction perpendicular to the X axis and the Z axis of the first rectangular coordinate system, and the plane where the X axis and the Y axis are located is set as the first plane, and the plane where the Y axis and the Z axis are located is set as the second plane, and the second plane is perpendicular to the first plane.

[0074] The reference point on the X-axis of the first rectangular coordinate system is set as the first reference point, and the reference point on the Z-axis of the first rectangular coordinate system is set as the second reference point.

[0075] Specifically, such as Figure 4 As shown, with the first reference point on the X-axis of the first rectangular coordinate system as the center of the circle and the distance between the first reference point and the target point as the radius, a first arc is drawn on the first plane, and with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius, a second arc is drawn on the first plane, and the intersection of the first arc and the second arc is the position of the target point in the first plane.

[0076] like Figure 5 As shown, with the second reference point on the Z axis of the first rectangular coordinate system as the center of the circle and the distance between the second reference point and the target point as the radius, a third arc is drawn on the second plane, and with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius, a fourth arc is drawn on the second plane. The intersection of the third arc and the fourth arc is the position of the target point in the second plane.

[0077] Of course, when determining the coordinates of the target point, you can also first use the second reference point on the Z axis of the first rectangular coordinate system as the center of the circle, and the distance between the second reference point and the target point as the radius, and draw a third arc on the second plane. In addition, use the coordinate origin as the center of the circle, and the distance between the coordinate origin and the target point as the radius, and draw a fourth arc on the second plane. The intersection of the third arc and the fourth arc is the position of the target point in the second plane.

[0078] Then, a first arc is drawn on the first plane with the first reference point on the X-axis of the first rectangular coordinate system as the center of the circle and the distance between the first reference point and the target point as the radius. Also, a second arc is drawn on the first plane with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius. The intersection of the first arc and the second arc is the position of the target point in the first plane.

[0079] Subsequently, the coordinate origin is selected again in the plane where the first rectangular coordinate system is located, and a second rectangular coordinate system is established in the first plane. The X' axis of the second rectangular coordinate system is parallel to the X axis of the first rectangular coordinate system, and the Z' axis is parallel to the Z axis of the first rectangular coordinate system. The coordinates of each first reference point, second reference point and balance point in the second rectangular coordinate system are measured, and the coordinates of the target point are obtained by combining the position of the target point in the first plane and the second plane.

[0080] In this embodiment, the coordinate origin is reselected and a second rectangular coordinate system is established to determine the overall coordinates of the target point.

[0081] In this embodiment, when the plane where the first rectangular coordinate system is located is a rectangle, the coordinate origin is selected at the intersection of two adjacent sides of the first plane of the rectangle, so as to determine the coordinate positions of the five points on the first plane according to the actual measurement surface and measurement position.

[0082] Preferably, the coordinate origin is selected as an intersection point that is closer to the five reference points among the four intersection points, so as to reduce the measurement error and improve the measurement accuracy.

[0083] The method for locating a target point in this embodiment has simple operation steps, making it easy for users to master the skills and operation methods, and can shorten the positioning time, reduce the positioning processing cycle, and reduce energy consumption.

[0084] Example 2:

[0085] This embodiment discloses a method for determining a discharge point in a transformer, which uses the method for locating a target point in Example 1 to locate the discharge point of the transformer, wherein the plane where the balance point is located is the wall surface of the transformer box, and the target point is the discharge point.

[0086] In this embodiment, when obtaining the balance point on the wall surface of the transformer tank, the first direction adopts the horizontal direction, and the first determined point is determined on the first straight line in the horizontal direction.

[0087] The second direction is a vertical direction, and a second determined point is determined on a second straight line in the vertical direction, and a balance point is obtained based on the first determined point and the second determined point.

[0088] In this embodiment, the equilibrium point is used as the coordinate origin, and a first rectangular coordinate system is established within the transformer tank wall. The X-axis of the first rectangular coordinate system is set as the horizontal direction of the transformer tank wall, and the Z-axis is set as the vertical direction of the transformer tank wall. At least one first reference point is set on each of the X-axes on either side of the coordinate origin, and at least one second reference point is set on each of the Z-axes on either side of the coordinate origin.

[0089] In this embodiment, a first reference point is set on both sides of the coordinate origin on the X-axis, and a second reference point is set on both sides of the coordinate origin on the Z-axis.

[0090] Specifically, an ultrasonic probe is used to detect on the tank wall of the transformer to determine the effective detection area of ​​the ultrasonic probe.

[0091] Then determine the first determination point in the horizontal direction: in the effective detection area, select multiple first detection points along the first straight line in the horizontal direction, such as Figure 1As shown, four first detection points are selected on the first straight line, and the distances between each first detection point and the discharge point are measured using an ultrasonic probe, which are R1, R2, R3, and R4, respectively. Figure 2 As shown, the closest point of each first detection point measured on the first straight line to the discharge point is the third point, and the distance between the third point and the discharge point is R3, so the third point is the first determination point.

[0092] Then determine the second fixed point in the vertical direction: Figure 2 The third point in the coordinate system is the origin, the first straight line in the horizontal direction is the X axis, and the second straight line in the vertical direction is the Z axis. A rectangular coordinate system is made, and multiple second detection points are selected on the Z axis and above and below the third point, and the distances between them and the discharge point are measured. In this embodiment, four second detection points are selected on the second straight line, where the distances between each second detection point on the second straight line and the coordinate origin and the discharge point are R5, R6, R7, R8, and R3, respectively. Figure 3 As shown, since R5=R3, the point closest to the discharge source can be the fifth point or the third point. Usually, the third point is selected as the point closest to the discharge source. The third point is also the second determined point on the second straight line. The third point is then selected as the point on the side wall of the transformer with the shortest distance from the discharge point, that is, the third point is the balance point.

[0093] If the point closest to the discharge point in the vertical direction is the seventh point, it is necessary to draw a third straight line in the horizontal direction through the seventh point, and select multiple third detection points on the third straight line for measurement to detect the point closest to the discharge point on the third straight line (the second closest point in the horizontal direction, that is, the first determined point reset). Repeat the above process until the distance between the determined points in the two coordinate axes in the rectangular coordinate system and the discharge point is the same, so as to determine the point on the transformer box wall with the smallest distance from the discharge point and obtain the balance point.

[0094] Using the first reference point in the horizontal direction (X axis), draw an arc in the XY plane (first plane) to determine the xy coordinates of the discharge point:

[0095] The third point is used as the balance point, and the balance point is set as the coordinate origin. The Y axis is set perpendicular to the X and Z axes to set a Cartesian coordinate system. The origin of the Cartesian coordinate system is set at the third point (0, 0, 0). The first reference points in the horizontal direction and the coordinate origin are used as the center of the circle. The distance from each point to the discharge point is used as the radius. An arc is drawn on the XY plane to obtain the intersection point. The intersection point is the position and coordinates of the discharge point P in the XY plane of the coordinate system. The coordinates show the distance from the discharge point to the box wall (Y axis coordinate) and the left and right distance from the coordinate origin (X axis coordinate).

[0096] Among them, the discharge point P is +X on the right side of the equilibrium point and -X on the left side of the equilibrium point. If the position of the discharge source P is as follows Figure 4 As shown, the local coordinates x and y of point P are determined.

[0097] Using the second reference point in the vertical direction (Z axis), draw an arc in the YZ plane (second plane) to determine the yz coordinate of the discharge point:

[0098] With the third point as the equilibrium point and the origin of the Cartesian coordinate system set at (0, 0, 0), draw an arc on the YZ plane with each of the second reference points in the vertical direction and the origin as the center, and the distance from each point to the discharge point as the radius. The intersection is the position and coordinates of the discharge source P on the YZ plane of the coordinate system. These coordinates indicate the distance from the discharge point to the tank wall (Y-axis coordinate) and the height distance from the origin (Z-axis coordinate).

[0099] Among them, the discharge point P is +Z above the equilibrium point and -Z below the equilibrium point. If the position of the discharge source P in the YZ plane is as follows Figure 5 As shown, the local coordinates y and z of point P are determined.

[0100] Among them, the values ​​of the Y-axis coordinate y determined twice are the same or close, and Figure 4 The coordinate x on the X-axis and the coordinate y on the Y-axis determined in do not interfere with each other.

[0101] Through the above steps of measurement and drawing, the local coordinate position of the discharge point P is obtained as P(x, y, z). The local coordinate position of the discharge point P obtained according to this method, in order to obtain the overall coordinates of the discharge point P, it is necessary to select the coordinate origin again in the plane where the first rectangular coordinate system is located, and establish a second rectangular coordinate system in the plane. The X' axis of the second rectangular coordinate system is parallel to the X axis, and the Z' axis is parallel to the Z axis. The coordinates of each first reference point, second reference point and balance point in the second rectangular coordinate system are measured, and combined with the position of the target point in the first plane and the second plane, the overall coordinates P(x', y', z') of the target point P are obtained.

[0102] The accuracy of the distance measurement between each detection point can be inferred based on the overall coordinates P (x', y', z') of the target point P, that is, the distance test between each reference point is correct. If this distance test is accurate, the accuracy of the discharge point position obtained by drawing can be ensured. Therefore, the local coordinates obtained by this method can improve the measurement accuracy of the effective detection point coordinates, thereby improving the accuracy of the overall coordinates P (x', y', z') of the discharge source position.

[0103] In this embodiment, the distance between each point and the discharge point is measured using an ultrasonic probe using the electroacoustic positioning method. The electroacoustic positioning method requires ensuring that the ultrasonic probe used can receive a sufficiently strong discharge signal and that the ultrasonic waves generated by the internal discharge of the transformer can be transmitted to the tank wall through the transformer oil and the insulating medium.

[0104] In this embodiment, the ultrasonic probe used is the TWAE-CI08 ultrasonic probe that comes with the TWPD-2 multi-channel digital partial discharge comprehensive analyzer produced by Baoding Tianwei Baobian Xinyu Technology Co., Ltd.

[0105] Figure 6 This is a diagram of the signal received by the ultrasonic probe, where the ultrasonic probe is a TWAE-CI08 ultrasonic probe. In the figure, the transmission time and distance from the discharge point received by the ultrasonic probe to the location where the ultrasonic probe is placed on the box wall are 0.5179ms and 0.725m respectively.

[0106] In this embodiment, before adopting the method for locating the target point in embodiment 1 to determine the discharge point of the transformer, the method further includes: pre-determining the position range of the discharge point in the transformer by using an electrical positioning method.

[0107] Specifically, the first step is to predetermine the position range of the discharge point in the transformer through an electrical positioning method.

[0108] The electrical positioning method can roughly determine the location of the discharge point and clearly identify whether the discharge point is in the medium voltage terminal, high voltage terminal, low voltage terminal, iron core or clamp.

[0109] In this embodiment, the electrical positioning method is performed using the steps in Appendix A 5 of GB / T1094.3-2003.

[0110] Step 2: Check the product structure diagram and familiarize yourself with the product structure to understand the product body structure and lead wire location. Combined with the results of electrical positioning, estimate the location of possible discharge points for the next ultrasonic positioning operation.

[0111] Step 3: Check the status of the ultrasonic probe. If there is no abnormality, place it at the possible discharge point and measure whether there is an obvious ultrasonic signal. If there is no obvious ultrasonic signal, keep moving the ultrasonic probe until a clear ultrasonic signal is received. At this time, record the measurement position, ultrasonic spectrum and test distance.

[0112] Among them, before performing the ultrasonic positioning operation, adhesive needs to be applied to the ultrasonic probe, and during the ultrasonic positioning operation, adhesive needs to be filled between the ultrasonic probe and the fuel tank to ensure reliable contact between the two.

[0113] Step 4: By moving the ultrasonic probe and analyzing the test data, determine the point with the strongest signal and the shortest distance, that is, the balance point and the distance between the balance point and the discharge point.

[0114] Step 5: After determining the balance point, set up the first rectangular coordinate system with the balance point as the coordinate origin, and test one point on each side of the balance point on the two coordinate axes to form a cross-shaped reference point.

[0115] Step 6: Select a suitable coordinate origin on the test surface of the fuel tank, such as the top or bottom edge of the fuel tank as the coordinate origin. Taking the coordinate origin as the reference, measure the three-dimensional coordinates (x', y', z') of the above five points, where x' is the length of the fuel tank in the long axis direction, y' is the length of the fuel tank in the short axis direction (if the selected fuel tank test surface is the XZ plane, y' is generally zero), and z' is the length of the fuel tank in the height direction, which is used to determine the three-dimensional coordinates of the actual discharge point P.

[0116] Step 7: Use drawing software to confirm the final fault point and its coordinates, and find the specific discharge location on the drawing.

[0117] Step 8: Inform the test results to the relevant departments for processing and confirmation.

[0118] like Figure 7 and Figure 8 As shown in the figure, the three-dimensional coordinates of the discharge point position are obtained by the five-point positioning method of the actual fault product and the drawing method based on the actual test data. Among them, the lower left edge of the measuring surface of the upper oil tank wall of the transformer is taken as the coordinate origin, as shown in the figure. Figure 7 As shown, the discharge point P is relative to the selected coordinate origin, and its x' is 326cm and y' is 75cm, as shown in Figure 8 As shown, the discharge point is relative to the selected coordinate origin, its y' is 72cm, z' is 172cm, then the coordinates of the discharge point are: x' is 326cm, y' is 72-75cm, z' is 172cm, during inspection, the discharge point is searched within the range of y'. Among them, y' in Figure 7 is 75cm, Figure 8 The y' value of 72 cm is due to the measurement error caused by the distance between the coordinate origin and the reference point.

[0119] The method for determining the discharge point in the transformer of this embodiment adopts the above-mentioned method for locating the target point, which can quickly determine the position of the discharge point in the transformer, accurately locate the discharge point, improve the accuracy of the discharge point positioning, and is suitable for detecting the discharge point when partial discharge anomalies occur in manufacturing plants and field equipment.

[0120] Example 3:

[0121] This embodiment discloses a device for locating a target point, including an acquisition module, a measurement module, and a determination module.

[0122] The acquisition module is used to obtain a balance point on any plane and obtain the distance value between the balance point and the target point. The balance point is the point on the plane with the smallest distance from the target point.

[0123] The measurement module is used to set up a first rectangular coordinate system in the plane with the balance point as the coordinate origin, and set at least one reference point on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and obtain the distance value between the reference point and the target point.

[0124] The determination module is used to determine the coordinates of the target point according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

[0125] The device for locating a target point in this embodiment has a simple structure, is easy to operate, and can quickly determine the target point.

[0126] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for locating a partial discharge target point, comprising the following steps: Obtain a balance point on any plane and obtain the distance between the balance point and a target point, wherein the balance point is the point on the plane with the smallest distance from the target point; measure the distance from the target point on the plane using an ultrasonic probe until the point with the smallest distance is found, which is used as the balance point; A first rectangular coordinate system is set in the plane with the balance point as the coordinate origin, and at least one reference point is set on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and the distance value between the reference point and the target point is obtained; The coordinates of the target point are determined according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

2. The method for locating a partial discharge target point according to claim 1, characterized in that: The coordinates of the target point are determined based on the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point, specifically including: Starting from the coordinate origin of the first rectangular coordinate system, set the Y axis in the direction perpendicular to the X axis and Z axis of the first rectangular coordinate system, and set the plane where the X axis and Y axis are located as the first plane, and the plane where the Y axis and Z axis are located as the second plane, and the second plane is perpendicular to the first plane. Set the reference point on the X-axis of the first rectangular coordinate system as the first reference point, and the reference point on the Z-axis of the first rectangular coordinate system as the second reference point. A first arc is drawn on the first plane with the first reference point on the X-axis of the first rectangular coordinate system as the center of the circle and the distance between the first reference point and the target point as the radius. Also, a second arc is drawn on the first plane with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius. The intersection of the first arc and the second arc is the position of the target point in the first plane.

3. The method for locating a partial discharge target point according to claim 2, characterized in that: Determining the coordinates of the target point based on the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point also includes: With the second reference point on the Z axis of the first rectangular coordinate system as the center of the circle and the distance between the second reference point and the target point as the radius, a third arc is drawn on the second plane. Also, with the origin of the coordinate system as the center of the circle and the distance between the origin of the coordinate system and the target point as the radius, a fourth arc is drawn on the second plane. The intersection of the third arc and the fourth arc is the position of the target point in the second plane.

4. The method for locating a partial discharge target point according to claim 3, characterized in that: Determining the coordinates of the target point based on the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point also includes: A second coordinate origin is selected in the plane where the first rectangular coordinate system is located, and a second rectangular coordinate system is established in the plane, wherein the X' axis of the second rectangular coordinate system is parallel to the X axis, and the Z' axis is parallel to the Z axis. The coordinates of each first reference point, second reference point and balance point in the second rectangular coordinate system are measured, and the coordinates of the target point are obtained by combining the position of the target point in the first plane and the second plane.

5. The method for locating a partial discharge target point according to any one of claims 1 to 4, characterized in that: Get the equilibrium point on any plane, specifically: S1: Setting a first straight line in a first direction on any plane, selecting a plurality of first detection points on the first straight line, and measuring the distance between the first detection points and the target point using an ultrasonic probe to determine the point on the first straight line closest to the target point, which is the first determined point; S2: Selecting a second direction on the plane, the second direction being perpendicular to the first direction, and setting a second straight line in the second direction, establishing a rectangular coordinate system with the first determined point as the coordinate origin and the first straight line and the second straight line as two coordinate axes, selecting a plurality of second detection points on the second straight line on both sides of the first determined point, and measuring the distances between the second detection points and the target point using an ultrasonic probe to determine the point on the second straight line that is closest to the target point, which is the second determined point; S3: If the distance between the second determined point and the target point is equal to the distance between the first determined point and the target point, then the first determined point is determined as the equilibrium point; If the distance between the second determined point and the target point is less than the distance between the first determined point and the target point, the second determined point is used as the coordinate origin, a third straight line is set in the first direction, a rectangular coordinate system is established with the second straight line and the third straight line as two coordinate axes, and multiple third detection points are selected on the third straight line on both sides of the second determined point. The distance between them and the target point is measured by an ultrasonic probe to determine the point on the third straight line that is closest to the target point. This point is the reset first determined point, and steps S2 and S3 are repeated until the balance point is obtained.

6. The method for locating a partial discharge target point according to claim 5, characterized in that: Before step S1, the method further includes: An ultrasonic probe is used to determine an effective detection area of ​​the ultrasonic probe on any selected plane, and the first straight line is set in the effective detection area.

7. The method for locating a partial discharge target point according to claim 4, characterized in that: Taking the balance point as the coordinate origin, setting a first rectangular coordinate system in the plane, setting at least one reference point on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and obtaining the distance value between the reference point and the target point, specifically including: A first rectangular coordinate system is set with the balance point as the coordinate origin, wherein at least one first reference point is set on each side of the coordinate origin on the X-axis of the first rectangular coordinate system, and the distance between each first reference point and the target point is measured by an ultrasonic probe to obtain the distance value between the first reference point and the target point, and At least one second reference point is set on the Z axis of the first rectangular coordinate system of the plane and on both sides of the coordinate origin. The distance between each second reference point and the target point is measured by an ultrasonic probe to obtain the distance value between the second reference point and the target point.

8. A method for determining a discharge point in a transformer, characterized in that: The method for locating a partial discharge target point according to any one of claims 1 to 7 is used to locate the discharge point of the transformer. The plane where the balance point is located is the wall surface of the transformer box, and the target point is the discharge point.

9. The method for determining the discharge point in a transformer according to claim 8, characterized in that: Before using the method of locating the partial discharge target point to determine the discharge point of the transformer, it also includes: The position range of the discharge point in the transformer is predetermined by electrical positioning method.

10. A device for locating a target point of partial discharge, characterized in that: Including acquisition module, measurement module and determination module, The acquisition module is used to obtain a balance point on any plane and obtain the distance value between the balance point and the target point, wherein the balance point is the point on the plane with the smallest distance from the target point; the distance between the plane and the target point is measured by an ultrasonic probe until the point with the smallest distance is found, which is used as the balance point; The measurement module is configured to set a first rectangular coordinate system in the plane with the balance point as the coordinate origin, set at least one reference point on each of the two coordinate axes of the first rectangular coordinate system and on both sides of the coordinate origin, and obtain a distance value between the reference point and the target point; The determination module is used to determine the coordinates of the target point according to the balance point, the reference point, the distance between the balance point and the target point, and the distance between the reference point and the target point.

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