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

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 line-shaped structure. Firstly, a minimum detection unit of a linear structure is provided, the number of devices is small, and the requirement for the calculated amount is low; 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; optimizing the arrangement relation between the detection device and the transformer substation, and simplifying a calculation model; a positioning error range formula is given by combining a time error and a temperature error of the detection method. According to the method, on the premise of least detection equipment, accurate positioning of fault abnormal discharge points in a two-dimensional plane is realized, and a positioning error range is given.

Description

Technical Field

[0001] The invention relates to a detection method for coordinating the positioning of abnormal accident discharge points of a transformer substation with sound and electromagnetic waves of a straight line structure, 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 the 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. At present, when an accident occurs in the substation, the reference substation camera video and manual station patrol method are used to locate the abnormal accident point. It takes a long time to find the video recording with 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. However, when an accident occurs in the substation, a large number of electromagnetic waves and sound waves will be generated in the station at the same time. The transmission characteristics of electromagnetic waves and sound waves can be studied and applied to the location detection of 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 a one-line 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 using a one-line structure sound and electromagnetic waves, comprising:

[0006] 1. Set the detection unit structure:

[0007] The detection unit is mainly composed of two sound detection devices and one electromagnetic wave detection device, wherein the sound detection devices are M1 and M2, the electromagnetic wave detection device is C, M1, M2 and C are on the same straight line, the distance between M1 and C is d, the distance between M2 and C is d, and the distance between M1 and M2 is 2d;

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

[0009]

[0010] 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℃;

[0011] 3. Establish the distance formula between the accident abnormal point and the monitoring unit:

[0012]

[0013] 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; 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, t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave, and v is the propagation speed of sound in the air;

[0014] 4. Establish a two-dimensional space coordinate system:

[0015] The following conditions must be met to establish a two-dimensional space coordinate system:

[0016] 1) The substation equipment area must be in quadrants I and II;

[0017] 2) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0);

[0018] 3) The two-dimensional coordinates of the sound detection device M1 are (-d, 0);

[0019] 4) The two-dimensional coordinates of the sound detection device M2 are (d, 0);

[0020] 5. Calculate the coordinates of the accident abnormal point:

[0021]

[0022] Among them, x is the abscissa of the accident abnormal point, and y is the ordinate of the accident abnormal point;

[0023] 6. Calculate the error range:

[0024]

[0025] 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.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Provide intelligent calculation method and give the location and accuracy range of the fault point.

[0028] 2. Provide post-fault inspection range for high-definition cameras, drones and inspection robots in substations.

[0029] 3. Use the least amount of testing equipment while ensuring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the structural diagram of the detection unit;

[0031] Figure 2 It is a schematic diagram of two-dimensional space coordinates. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] 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.

[0034] A detection method for co-locating abnormal accident discharge points of a substation by using a one-line structure sound and electromagnetic waves of the present invention comprises the following steps:

[0035] 1. Set up the detection unit structure:

[0036] The detection unit is mainly composed of two sound detection devices and one electromagnetic wave detection device, wherein the sound detection devices are M1 and M2, the electromagnetic wave detection device is C, M1, M2 and C are on the same straight line, the distance between M1 and C is d, the distance between M2 and C is d, and the distance between M1 and M2 is 2d;

[0037] 2. Establish the relationship between the speed of sound propagation in air and temperature:

[0038]

[0039] 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℃;

[0040] 3. Establish the distance formula between the accident abnormal point and the monitoring unit:

[0041]

[0042] 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; 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, t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave, and v is the propagation speed of sound in the air;

[0043] 4. Establish a two-dimensional space coordinate system:

[0044] The following conditions must be met to establish a two-dimensional space coordinate system:

[0045] 1) The substation equipment area must be in quadrants I and II;

[0046] 2) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0);

[0047] 3) The two-dimensional coordinates of the sound detection device M1 are (-d, 0);

[0048] 4) The two-dimensional coordinates of the sound detection device M2 are (d, 0);

[0049] 5. Calculate the coordinates of the accident abnormal point:

[0050]

[0051] Among them, x is the abscissa of the accident abnormal point, and y is the ordinate of the accident abnormal point;

[0052] 6. Calculate the error range:

[0053]

[0054] 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.

[0055] The specific embodiments are described in detail as follows:

[0056] Time sampling accuracy t =6.94×10 -5 s, temperature sampling accuracy e T =2℃, the distance between M1 and C, and the distance between M2 and C are both 2m, the ambient temperature T = 20℃, and the coordinates of the simulated fault point are P(50,20).

[0057] Due to the 2°C error in temperature sampling accuracy, it is assumed that the temperature adopts an error of e T '=1.2℃, calculate the current sound wave speed as:

[0058]

[0059] The time when each detection device receives abnormal sound and abnormal electromagnetic wave is t0=0s, and the time when the electromagnetic wave detection device C receives abnormal electromagnetic wave is t1=0.1583s. The time error is 3.26×10 -5 s, the time when the sound detection device M2 receives the abnormal sound is t2 = 0.1477s, and the time error is -6.76×10 -5 s.

[0060] Calculation distance between the accident abnormal point and the monitoring unit:

[0061]

[0062] Calculation coordinates of accident anomaly points:

[0063]

[0064] The calculated error is:

[0065]

[0066] The fault point P (50, 20) is within 2.6141m of the fault calculation point (50.6759, 18.5268).

[0067] 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.

[0068] 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 a one-line structure sound and electromagnetic waves, characterized in that: The method comprises the following steps: 1) Set the detection unit structure: The detection unit is mainly composed of two sound detection devices and one electromagnetic wave detection device, wherein the sound detection devices are M1 and M2, the electromagnetic wave detection device is C, M1, M2 and C are on the same straight line, the distance between M1 and C is d, the distance between M2 and C is d, and the distance between M1 and M2 is 2d; 2) Establish the relationship between the speed of sound propagation in air and temperature; 3) Establish 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; 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, t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave, and 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 substation equipment area must be in quadrants I and II; (2) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0); (3) The two-dimensional coordinates of the sound detection device M1 are (-d, 0); (4) The two-dimensional coordinates of the sound detection device M2 are (d, 0); 5) Calculate the coordinates of the accident abnormal point: Among them, x is the abscissa of the accident abnormal point, and y is the ordinate of the accident abnormal point; 6) Calculate the error range: 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.

2. The detection method of using a one-line structure sound electromagnetic wave to coordinately locate the abnormal accident discharge point of a substation 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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