Detection method for positioning abnormal accident discharge point of transformer substation through cooperation of sound and electromagnetic waves of right-angle structure

Abstract

The invention discloses a detection method for positioning an abnormal accident discharge point of a transformer substation through cooperation of sound and electromagnetic waves of a right-angle structure. Firstly, a minimum detection unit of a right-angle structure is provided, and the detection unit is composed of three sound detection devices and an electromagnetic wave detection device; calculating the distance between the detection point and the fault source by combining a relation function between the propagation speed of the sound in the air and the temperature; the arrangement relation between the detection device and the substation has no special requirement, and a calculation model is simple; a positioning error range is given by combining a time error and a temperature error of the detection method. The invention provides an intelligent calculation method, and provides a positioning and precision range of a fault point. And a post-fault inspection range is provided for a high-definition camera, an unmanned aerial vehicle and an inspection robot in the transformer substation.

Description

Technical Field

[0001] The invention relates to a detection method for co-locating abnormal accident discharge points of a transformer substation with right-angle structure sound and electromagnetic waves, and belongs to the technical field of power grids. Background Art

[0002] At present, the power system is becoming increasingly complex, the grid structure is becoming increasingly complex, and the substation structure is becoming increasingly complex. When an accident occurs in an outdoor station, it is particularly difficult to find the fault point, which greatly affects the speed of accident handling and reduces the reliability of grid operation. In the prior art, when an accident occurs in a substation, the location and search of the abnormal accident point mainly adopts the method of referring to the substation camera video and conducting manual station inspections. It takes a long time to find the recording of the fault discharge, and the video can only give the approximate fault area with low accuracy. It has limited guidance for substation accident search and cannot guide drones and robots in substations to carry out special patrols. When an accident occurs in a substation, a large number of electromagnetic waves and sound waves will be generated in the station at the same time, and the transmission characteristics of electromagnetic waves and sound waves can be used to locate the abnormal accident point. Summary of the invention

[0003] The purpose of the present invention is to provide a detection method for co-locating abnormal accident discharge points of a substation by using right-angle structure sound and electromagnetic waves, so as to realize rapid and accurate positioning of the fault discharge point when an accident trip occurs in the substation.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A detection method for co-locating abnormal accident discharge points of a substation by using right-angle structure sound and electromagnetic waves, comprising the following steps:

[0006] 1) Establish the detection unit structure:

[0007] The detection unit is composed of three sound detection devices and one electromagnetic wave detection device. The sound detection devices are M1, M2, and M3, and the electromagnetic wave detection device is C. M1, M2, and C are on the same straight line, and M3, M2, and C are on the same straight line. The two straight lines are perpendicular to each other to form a cross structure. The distance between M1 and M3 and C is d, and M2 and C are at the same position.

[0008] 2) Establish the relationship between the speed of sound propagation in air and temperature;

[0009] 3) The distance formula between the accident abnormal point and the monitoring unit:

[0010]

[0011] Wherein, d1 is the calculated distance between the sound detection device M1 and the abnormal point of the accident; d2 is the calculated distance between the sound detection device M2 and the abnormal point of the accident; d3 is the calculated distance between the sound detection device M3 and the abnormal point of the accident; t1 is the time when the sound detection device M1 receives the abnormal sound; t2 is the time when the sound detection device M2 receives the abnormal sound; t3 is the time when the sound detection device M3 receives the abnormal sound, and t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave; v is the propagation speed of sound in the air;

[0012] 4) Establish a two-dimensional space coordinate system:

[0013] The following conditions must be met to establish a two-dimensional space coordinate system:

[0014] (1) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0);

[0015] (2) The two-dimensional coordinates of the sound detection device M1 are (d, 0);

[0016] (3) The two-dimensional coordinates of the sound detection device M2 are (0, 0);

[0017] (4) The two-dimensional coordinates of the sound detection device M3 are (0, d);

[0018] 5) Calculation of coordinates of accident abnormal points:

[0019]

[0020] Among them, x is the horizontal coordinate of the accident abnormal point, y is the vertical coordinate of the accident abnormal point, d1 is the calculated distance between the sound detection device M1 and the accident abnormal point, d2 is the calculated distance between the sound detection device M2 and the accident abnormal point; d3 is the calculated distance between the sound detection device M3 and the accident abnormal point; d is the distance between M1 and C;

[0021] 6) Error range calculation:

[0022]

[0023] Among them, e x is the error in the horizontal axis direction, e y is the error in the ordinate direction, e is the error between the positioning result and the actual position, e t is the time sampling accuracy, e T is the temperature sampling accuracy, d1 is the calculated distance between the sound detection device M1 and the abnormal point of the accident; d2 is the calculated distance between the sound detection device M2 and the abnormal point of the accident; d3 is the calculated distance between the sound detection device M3 and the abnormal point of the accident, and d is the distance between M1 and C.

[0024] The detection method for the right-angle structure sound and electromagnetic wave collaborative positioning of abnormal accident discharge points in a substation, wherein the relationship between the propagation speed of the sound in the air and the temperature in step 2) is:

[0025]

[0026] Where v is the speed of sound in air, in m / s; v 15 The speed of sound in air at 15 degrees Celsius, v 15 =340m / s; T is the atmospheric temperature, unit is ℃; T 15 =15℃.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Provide intelligent calculation method and give the location and accuracy range of the fault point.

[0029] 2. Provide post-fault inspection range for high-definition cameras, drones and inspection robots in substations.

[0030] 3. The detection accuracy is higher than that of the "single-line structure" detection device, and there is no special requirement for the relative position of the detection device and the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the structural diagram of the detection unit;

[0032] Figure 2 It is a schematic diagram of two-dimensional space coordinates. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figure 1 is the structure diagram of the detection unit, such as Figure 2 It is a schematic diagram of two-dimensional space coordinates.

[0035] A detection method for co-locating abnormal accident discharge points of a substation by using right-angle structure sound and electromagnetic waves of the present invention comprises the following steps:

[0036] 1) Establish the detection unit structure:

[0037] The detection unit is composed of three sound detection devices and one electromagnetic wave detection device. The sound detection devices are M1, M2, and M3, and the electromagnetic wave detection device is C. M1, M2, and C are on the same straight line, and M3, M2, and C are on the same straight line. The two straight lines are perpendicular to each other to form a cross structure. The distance between M1 and M3 and C is d, and M2 and C are at the same position.

[0038] 2) Establish the relationship between the speed of sound propagation in air and temperature; Where v is the speed of sound in air, in m / s; v 15 The speed of sound in air at 15 degrees Celsius, v 15 =340m / s; T is the atmospheric temperature, unit is ℃; T 15 =15℃;

[0039] 3) The distance formula between the accident abnormal point and the monitoring unit:

[0040]

[0041] Wherein, d1 is the calculated distance between the sound detection device M1 and the abnormal point of the accident; d2 is the calculated distance between the sound detection device M2 and the abnormal point of the accident; d3 is the calculated distance between the sound detection device M3 and the abnormal point of the accident; t1 is the time when the sound detection device M1 receives the abnormal sound; t2 is the time when the sound detection device M2 receives the abnormal sound; t3 is the time when the sound detection device M3 receives the abnormal sound, and t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave; v is the propagation speed of sound in the air;

[0042] 4) Establish a two-dimensional space coordinate system:

[0043] The following conditions must be met to establish a two-dimensional space coordinate system:

[0044] (1) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0);

[0045] (2) The two-dimensional coordinates of the sound detection device M1 are (d, 0);

[0046] (3) The two-dimensional coordinates of the sound detection device M2 are (0, 0);

[0047] (4) The two-dimensional coordinates of the sound detection device M3 are (0, d);

[0048] 5) Calculation of coordinates of accident abnormal points:

[0049]

[0050] Among them, x is the horizontal coordinate of the accident abnormal point, y is the vertical coordinate of the accident abnormal point, d1 is the calculated distance between the sound detection device M1 and the accident abnormal point, d2 is the calculated distance between the sound detection device M2 and the accident abnormal point; d3 is the calculated distance between the sound detection device M3 and the accident abnormal point; d is the distance between M1 and C;

[0051] 6) Error range calculation:

[0052]

[0053] Among them, e x is the error in the horizontal axis direction, e y is the error in the ordinate direction, e is the error between the positioning result and the actual position, e t is the time sampling accuracy, e T is the temperature sampling accuracy, d1 is the calculated distance between the sound detection device M1 and the abnormal point of the accident; d2 is the calculated distance between the sound detection device M2 and the abnormal point of the accident; d3 is the calculated distance between the sound detection device M3 and the abnormal point of the accident, and d is the distance between M1 and C.

[0054] The following is a specific embodiment of the application of the present invention:

[0055] Time sampling accuracy t =6.94×10 -5 s, temperature sampling accuracy e T =2℃, the distances d between M1 and C, M2 and C, M3 and C, and M4 and C are all 1m, the ambient temperature T=20℃, and the coordinates of the simulated fault point are P(67.87,33.2).

[0056] Due to the 2°C error in temperature sampling accuracy, it is assumed that the temperature adopts an error of e T '=-0.9℃, calculate the current sound wave speed as:

[0057]

[0058] The time when each detection device receives the abnormal sound and abnormal electromagnetic wave is t0 = 0s, and the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave is t1 = 0.2096s, and the time error is 6.29×10 -5 s, the time when the sound detection device M2 receives the abnormal sound is t2 = 0.2146s, and the time error is 6.01×10 -5 s, the time when the sound detection device M3 receives the abnormal sound is t3 = 0.2121s, and the time error is -6.72×10 -5 s.

[0059] Calculation distance between the accident abnormal point and the monitoring unit:

[0060]

[0061] Calculation coordinates of accident anomaly points:

[0062]

[0063] The calculated error is:

[0064]

[0065] The fault point P (67.87, 33.2) is within 3.0377m of the fault calculation point (66.0509, 33.0909).

[0066] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection method for co-locating abnormal accident discharge points of a substation by using right-angle structure sound and electromagnetic waves, characterized in that: The following steps are involved: 1) Establish the detection unit structure: The detection unit is composed of three sound detection devices and one electromagnetic wave detection device. The sound detection devices are M1, M2, and M3, and the electromagnetic wave detection device is C. M1, M2, and C are on the same straight line, and M3, M2, and C are on the same straight line. The two straight lines are perpendicular to each other to form a cross structure. The distance between M1 and M3 and C is d, and M2 and C are at the same position. 2) Establish the relationship between the speed of sound propagation in air and temperature; 3) The distance formula between the accident abnormal point and the monitoring unit: Wherein, d1 is the calculated distance between the sound detection device M1 and the abnormal point of the accident; d2 is the calculated distance between the sound detection device M2 and the abnormal point of the accident; d3 is the calculated distance between the sound detection device M3 and the abnormal point of the accident; t1 is the time when the sound detection device M1 receives the abnormal sound; t2 is the time when the sound detection device M2 receives the abnormal sound; t3 is the time when the sound detection device M3 receives the abnormal sound, and t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave; v is the propagation speed of sound in the air; 4) Establish a two-dimensional space coordinate system: The following conditions must be met to establish a two-dimensional space coordinate system: (1) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0); (2) The two-dimensional coordinates of the sound detection device M1 are (d, 0); (3) The two-dimensional coordinates of the sound detection device M2 are (0, 0); (4) The two-dimensional coordinates of the sound detection device M3 are (0, d); 5) Calculation of coordinates of accident abnormal points: Among them, x is the horizontal coordinate of the accident abnormal point, y is the vertical coordinate of the accident abnormal point, d1 is the calculated distance between the sound detection device M1 and the accident abnormal point, d2 is the calculated distance between the sound detection device M2 and the accident abnormal point; d3 is the calculated distance between the sound detection device M3 and the accident abnormal point; d is the distance between M1 and C; 6) Error range calculation: Among them, e x is the error in the horizontal axis direction, e y is the error in the ordinate direction, e is the error between the positioning result and the actual position, e t is the time sampling accuracy, e T is the temperature sampling accuracy, d1 is the calculated distance between the sound detection device M1 and the abnormal point of the accident; d2 is the calculated distance between the sound detection device M2 and the abnormal point of the accident; d3 is the calculated distance between the sound detection device M3 and the abnormal point of the accident, and d is the distance between M1 and C.

2. The detection method of right-angle structure sound electromagnetic wave collaborative positioning of abnormal accident discharge points of substations as claimed in claim 1 is characterized in that: The relationship between the propagation speed of sound in air and temperature is: Where v is the speed of sound in air, in m / s; v 15 The speed of sound in air at 15 degrees Celsius, v 15 =340m / s; T is the atmospheric temperature, unit is ℃; T 15 =15℃.

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