Method for detecting abnormal accident discharge points of transformer substation through cooperative positioning of sound and electromagnetic waves of cross structure

Abstract

The invention discloses a detection method for positioning abnormal accident discharge points of a transformer substation through cooperation of sound and electromagnetic waves of a cross right-angle structure. Firstly, a minimum detection unit of a cross right-angle structure is provided, and two sound detection units are added compared with a linear structure; 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 transformer substation has no special requirement, and the calculation model is greatly simplified; a positioning error range is given by combining a time error and a temperature error of the detection method. According to the method, although detection equipment is added, a positioning and error calculation model is greatly simplified, and the fault positioning precision is remarkably improved.

Description

Technical Field

[0001] The present invention relates to a detection method for abnormal accident discharge points in a substation by cross-structured sound and electromagnetic wave collaborative positioning, belonging to the technical field of power grids. Background Art

[0002] Currently, the power system is becoming increasingly complex, the power grid structure is becoming increasingly complex, and the substation mechanism is becoming increasingly complex. When in-station accidents occur at outdoor substations, it is particularly difficult to locate the fault points, which greatly affects the accident handling speed and reduces the reliability of power grid operation. Currently, for the positioning of accident abnormal occurrence points, methods such as referring to substation camera video data and conducting manual in-station inspections are adopted. It takes a long time to find the video recording of fault discharges, and the video can only give a rough fault area with low accuracy, providing limited guidance for substation accident searches and unable to guide the inspection of unmanned aerial vehicles and robots in the substation. Summary of the Invention

[0003] The purpose of the present invention is to provide a detection method for abnormal accident discharge points in a substation by cross-structured sound and electromagnetic wave collaborative positioning, solve the problems described in the background art, and achieve rapid and accurate positioning of fault discharge points during in-station accident tripping.

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

[0005] A detection method for abnormal accident discharge points in a substation by cross-structured sound and electromagnetic wave collaborative positioning includes:

[0006] 1) Set the structure of the detection unit:

[0007] The detection unit consists of 2 sound detection devices and 1 electromagnetic wave detection device. Among them, the sound detection devices are M1, M2, M3, and M4 respectively, and the electromagnetic wave detection device is C. M1, M2, and C are on the same straight line, M3, M4, and C are on the same straight line, and the two straight lines are perpendicular to each other, forming a cross structure. The distances between M1, M2, M3, M4 and C are all d;

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

[0009]

[0010] Among them, v is the propagation speed of sound in air, with the unit of m / s; v 15 is the propagation speed of sound in air at 15 degrees Celsius, v 15 = 340 m / s; T is the atmospheric temperature, with the unit of °C; T 15 = 15 °C;

[0011] 3) Calculate the distance between the accident abnormal point and the monitoring unit:

[0012]

[0013] Among them, 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; d4 is the calculated distance between the sound detection device M4 and the accident abnormal point; 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, t4 is the time when the sound detection device M4 receives the abnormal sound, and t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave;

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

[0015] (1) The substation equipment area can be placed in any of the four quadrants I, II, III, and IV;

[0016] (2) The two-dimensional coordinates of the electromagnetic wave detection device C are (0, 0);

[0017] (3) The two-dimensional coordinates of the sound detection device M1 are (-d, 0);

[0018] (4) The two-dimensional coordinates of the sound detection device M2 are (d, 0);

[0019] (5) The two-dimensional coordinates of the sound detection device M3 are (0, -d);

[0020] (6) The two-dimensional coordinates of the sound detection device M4 are (0, d);

[0021] 5) Calculate the coordinates of the accident abnormal point:

[0022]

[0023] Among them, x is the abscissa of the accident abnormal point, and y is the ordinate of the accident abnormal point.

[0024] Furthermore, the calculation method of the detection error range of the abnormal accident discharge point is:

[0025]

[0026] Among them, e x is the error in the horizontal coordinate direction, e y is the error in the vertical coordinate 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, x is the abscissa of the accident abnormal point, and y is the ordinate of the accident abnormal point.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The present invention provides an intelligent calculation method, which gives the location and accuracy range of the fault point.

[0029] 2. The present invention provides the post-fault inspection range for high-definition cameras, unmanned aerial vehicles and inspection robots in the substation.

[0030] 3. The detection accuracy is higher than that of detection devices such as the "one-word structure" method and the "right-angle structure", and there are no special requirements for the relative position between the detection device and the substation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] Figure 2 is the schematic diagram of two-dimensional space coordinates. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be further described below with reference to the drawings and specific embodiments.

[0034] As Figure 1 is the structural diagram of the detection unit, and as Figure 2 is the schematic diagram of two-dimensional space coordinates.

[0035] An embodiment of the detection method for abnormal accident discharge points in a substation by collaborative positioning of sound and electromagnetic waves with a cross structure of the present invention is as follows:

[0036] Time sampling accuracy e t = 6.94×10 -5 s, temperature sampling accuracy e T = 2°C, the distances between M1 and C, M2 and C, M3 and C, and M4 and C are all 1m, the ambient temperature T = 21.2°C, and the simulated fault point coordinates are P(-45.9, 27.8).

[0037] Due to the temperature sampling accuracy error of 2°C, the current sound wave speed is calculated as:

[0038]

[0039] The times when each detection device receives abnormal sound and abnormal electromagnetic waves are: the time t0 when the electromagnetic wave detection device C receives the abnormal electromagnetic wave is 0s, the time t1 when the sound detection device M1 receives the abnormal sound is 0.1500s, the time t2 when the sound detection device M2 receives the abnormal sound is 0.1549s, the time t3 when the sound detection device M3 receives the abnormal sound is 0.1539s, and the time t4 when the sound detection device M4 receives the abnormal sound is 0.1509s.

[0040] The calculated distance between the accident anomaly point and the monitoring unit:

[0041]

[0042] The calculated coordinates of the accident anomaly point:

[0043]

[0044] The calculation error is:

[0045]

[0046] In summary, the fault point P(-45.9, 27.8) is within the range of 1.8084 m from the fault calculation point (-45.7825, 27.9193).

[0047] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection method for abnormal accident discharge points in a substation by synergistic positioning of sound and electromagnetic waves with a cross structure, characterized in that, Including: 1) Set up the detection unit structure: The detection unit consists of 2 sound detection devices and an electromagnetic wave detection device. Among them, the sound detection devices are M1, M2, M3, and M4 respectively, and the electromagnetic wave detection device is C. M1, M2, and C are on the same straight line, M3, M4, and C are on the same straight line, and the two straight lines are perpendicular to each other, forming a cross structure. The distances between M1, M2, M3, M4 and C are all d; 2) Relationship between the speed of sound propagation in air and temperature: Among them, v is the propagation speed of sound in the air, with the unit of m / s; v 15 is the propagation speed of sound in the air at 15 degrees Celsius, v 15 = 340 m / s; T is the atmospheric temperature, with the unit of °C; T 15 = 15 °C; 3) Calculate the distance between the accident abnormal point and the monitoring unit: Among them, 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; d4 is the calculated distance between the sound detection device M4 and the accident abnormal point; 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, t4 is the time when the sound detection device M4 receives the abnormal sound, and t0 is the time when the electromagnetic wave detection device C receives the abnormal electromagnetic wave; 4) Establish a two-dimensional space coordinate system: (1) The substation equipment area can be placed in any of the quadrants I, II, III, and IV; (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) The two-dimensional coordinates of the sound detection device M3 are (0, -d); (6) The two-dimensional coordinates of the sound detection device M4 are (0, d); 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.

2. The method for detecting the abnormal accident discharge point of a substation by cross-structure sound and electromagnetic wave collaborative positioning according to claim 1, wherein The calculation method for the detection error range of the abnormal accident discharge point is: Among them, e x is the error in the horizontal coordinate direction, e y is the error in the vertical coordinate 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, x is the abscissa of the accident abnormal point, and y is the ordinate of the accident abnormal point.

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