Method for detecting ice thickness of power transmission line based on ice layer capacitance

Abstract

The application provides a kind of ice layer capacitance-based transmission line icing thickness detection method, comprising: setting a cylinder for icing in the environment of the transmission line to be measured, setting a semi-ring electrode on the surface of the cylinder, every two semi-ring electrodes form a group and two semi-ring electrodes form a detection capacitor;Construct a capacitor detection circuit, the capacitor detection circuit includes a detection capacitor, a resistor and a detection inductor, one end of the resistor is used as an excitation input end and inputs a resonant excitation signal, the other end of the resistor is connected to one end of the detection inductor, the other end of the detection inductor is connected to one end of the detection capacitor, the other end of the detection capacitor is connected to a receiving circuit, the receiving circuit is used to receive an output signal through the capacitor detection circuit, and the frequency of the cylinder after icing is determined according to the signal;Calculate the ice layer capacitance based on the frequency after icing;And build an icing thickness calculation model based on the ice layer capacitance, and calculate the icing thickness of the transmission line.

Description

Technical Field

[0001] This invention relates to a method for detecting the ice thickness of transmission lines, and more particularly to a method for detecting the ice thickness of transmission lines based on ice layer capacitance. Background Technology

[0002] In power transmission lines, especially overhead transmission lines in high-altitude and cold regions, it is necessary to monitor the thickness of ice accretion to provide accurate data support for the formulation of anti-icing and de-icing measures.

[0003] In existing technologies, monitoring the icing thickness of transmission lines involves manual methods and image-based methods. However, manual methods require human patrols, which are inefficient, inaccurate, and pose significant safety risks. Image-based methods acquire images of the transmission lines using image acquisition equipment and then employ existing image processing algorithms to assess icing. While this method improves efficiency and avoids the safety risks associated with manual methods, its accuracy is difficult to guarantee. This is because image acquisition is affected by environmental factors, such as ambient light. Especially with iced transmission lines, light reflection can cause image acquisition errors, leading to inaccuracies in monitoring and subsequent calculations. Existing technologies also utilize sensors for tension and stress to monitor icing on transmission lines. However, these methods require operation on the transmission lines themselves, impacting the lines and posing potential safety hazards.

[0004] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a method for detecting the ice thickness of transmission lines based on ice capacitance. A cylinder made of the same material as the conductor of the transmission line is used to simulate the transmission line, and a detection capacitor is set on the cylinder. Then, the ice thickness of the transmission line is determined based on the ice capacitance value, which can effectively ensure the accuracy of the prediction of the ice thickness of the transmission line, and will not cause damage to the transmission line itself, effectively avoiding safety hazards in the monitoring process.

[0006] This invention provides a method for detecting the ice thickness of transmission lines based on ice capacitance, comprising:

[0007] A cylinder for icing is set up in the environment of the transmission line under test. A semi-circular electrode is set on the surface of the cylinder. Every two semi-circular electrodes form a group and the two semi-circular electrodes form a detection capacitor.

[0008] A capacitance detection circuit is constructed, which includes a detection capacitor, a resistor, and a detection inductor. One end of the resistor serves as the excitation input terminal and receives the resonant excitation signal. The other end of the resistor is connected to one end of the detection inductor. The other end of the detection inductor is connected to one end of the detection capacitor. The other end of the detection capacitor is connected to a receiving circuit. The receiving circuit is used to receive the output signal after passing through the capacitance detection circuit and determine the frequency of the cylinder after it is covered with ice based on the signal.

[0009] The ice capacitance is calculated based on the frequency after icing; and an ice thickness calculation model is constructed based on the ice capacitance to calculate the ice thickness of the transmission line.

[0010] Furthermore, the ice thickness calculation model is as follows:

[0011]

[0012] Where: A is the icing coefficient, D is the diameter of the transmission line conductor, D1 is the diameter of the cylinder after icing, and d is the icing thickness of the cylinder;

[0013]

[0014] Where: C is the icing capacitance value of the cylinder, k is the icing characteristic coefficient, and e is the characteristic index of the relationship between icing thickness and capacitance value.

[0015] Furthermore, the icing capacitance value of the cylinder is determined as follows:

[0016]

[0017] Where: n is the number of sensing capacitors, C yi and C bi C represents the capacitance values ​​of the i-th detection capacitor on the windward and leeward sides after icing, respectively. yi0 and C bi0 These are the initial values ​​of the i-th detection capacitor on the windward and leeward sides before icing, respectively.

[0018] Furthermore, the capacitance value of the detection capacitor after icing is determined as follows:

[0019] Where: C i Let f be the capacitance value of the i-th detection capacitor, and f be the frequency of the output signal of the capacitor detection circuit.

[0020] Furthermore, the cylinder is made of the same material and has the same outer diameter as the conductor of the power transmission line being tested, and the cylinder is installed parallel to and at the same height as the power transmission line being tested.

[0021] Furthermore, the number of detection capacitors is n, and n is an even number. n / 2 capacitors are set on the windward side of the cylinder and n / 2 capacitors are set on the leeward side of the cylinder. The detection capacitors on the leeward and windward sides of the cylinder are staggered, and the detection capacitors on the same side of the cylinder are arranged at equal intervals.

[0022] Furthermore, an insulating film is provided between the semi-annular electrode and the surface of the cylinder.

[0023] Furthermore, the receiving circuit is an FDC2112 chip and its peripheral circuits.

[0024] The beneficial effects of this invention are as follows: A cylinder made of the same material as the conductor of the power transmission line is used to simulate the power transmission line, and a detection capacitor is set on the cylinder. Then, the ice thickness of the power transmission line is determined based on the ice layer capacitance value. This can effectively ensure the accuracy of the prediction of the ice thickness of the power transmission line, and will not cause damage to the power transmission line itself, thus effectively avoiding safety hazards in the monitoring process. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 This is a flowchart of the present invention.

[0027] Figure 2 This is a schematic diagram of the cylindrical structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the detection capacitance principle of the present invention. Detailed Implementation

[0029] The present invention will be further described in detail below:

[0030] This invention provides a method for detecting the ice thickness of transmission lines based on ice capacitance, comprising:

[0031] A cylinder for icing is set up in the environment of the transmission line under test. A semi-circular electrode is set on the surface of the cylinder. Every two semi-circular electrodes form a group and the two semi-circular electrodes form a detection capacitor.

[0032] A capacitance detection circuit is constructed, comprising a detection capacitor, a resistor, and a detection inductor. One end of the resistor serves as the excitation input terminal and receives the resonant excitation signal. The other end of the resistor is connected to one end of the detection inductor, the other end of the detection inductor is connected to one end of the detection capacitor, and the other end of the detection capacitor is connected to a receiving circuit. The receiving circuit receives the output signal from the capacitance detection circuit and determines the frequency of the cylinder after it is covered with ice based on the signal. Figure 3As shown: C is the detection capacitor, L is the detection inductor, and R is the resistor. The receiving circuit is the FDC2112 chip and its peripheral circuit. This chip is a multi-channel chip, which can output a resonant excitation signal and receive the signal output by the detection circuit and measure the corresponding frequency. Of course, the resonant excitation signal can also be provided by other existing devices.

[0033] The ice capacitance is calculated based on the frequency after icing; an ice thickness calculation model is then constructed based on the ice capacitance, and the ice thickness of the transmission line is calculated. Using this method, a cylinder made of the same material as the transmission line conductor is used to simulate the transmission line, and a detection capacitor is placed on the cylinder. The ice thickness of the transmission line is then determined based on the ice capacitance value. This effectively ensures the accuracy of the ice thickness prediction without damaging the transmission line itself, effectively avoiding safety hazards during monitoring.

[0034] In this embodiment, the ice thickness calculation model is as follows:

[0035]

[0036] Where: A is the icing coefficient, D is the diameter of the transmission line conductor, D1 is the diameter of the cylinder after icing, and d is the icing thickness of the cylinder;

[0037]

[0038] Where: C is the icing capacitance value of the cylinder, k is the icing characteristic coefficient, and e is the characteristic index of the relationship between icing thickness and capacitance value. Through the above method, the icing of transmission lines can be accurately assessed. The icing characteristic coefficient and the characteristic index of the relationship between icing thickness and capacitance value are determined through existing experiments.

[0039] In this embodiment, the ice capacities of the cylinder are determined as follows:

[0040]

[0041] Where: n is the number of sensing capacitors, C yi and C bi C represents the capacitance values ​​of the i-th detection capacitor on the windward and leeward sides after icing, respectively. yi0 and C bi0 These are the initial values ​​of the i-th detection capacitor on the windward and leeward sides before icing, respectively. Before icing, the capacitance value of the capacitor formed by the two semi-circular electrodes is relatively small due to the influence of the facing area, the dielectric constant of air, and the distance between the two electrodes. After icing, since the dielectric constant of the icing nodes is much larger than that of air, it is necessary to remove the pre-icing capacitance value from the post-icing capacitance value of each monitoring capacitor to obtain the icing capacitance value.

[0042] In this embodiment, the capacitance value of the detection capacitor after icing is determined in the following way:

[0043] Where: C i Let f be the capacitance value of the i-th detection capacitor, and f be the frequency of the output signal of the capacitance detection circuit. The capacitance value of each detection capacitor after icing is calculated using this formula, and the capacitance value of each detection capacitor is determined in this way.

[0044] In this embodiment, the cylinder is made of the same material and has the same outer diameter as the conductor of the power transmission line under test. Furthermore, the cylinder is installed parallel to and at the same height as the power transmission line under test, which ensures the accuracy of the final evaluation mechanism.

[0045] In this embodiment, the number of detection capacitors is n, where n is an even number. n / 2 capacitors are placed on the windward side of the cylinder, and n / 2 capacitors are placed on the leeward side of the cylinder. The detection capacitors on the windward and leeward sides of the cylinder are staggered, and the detection capacitors on the same side of the cylinder are arranged at equal intervals. Figure 2 As shown: the windward side refers to the top of the diagram, and the leeward side refers to the bottom. Since icing mainly occurs in winter, the wind direction is generally more stable. It is only necessary to... Figure 2 The top of the center should face the wind direction. Of course, if... Figure 2 As shown below, the area directly faces the wind, making it the windward side. Therefore, the windward side mentioned above is only a reference direction and not absolute. Since the icing conditions and icing growth differ between the windward and leeward sides, the above method can effectively and accurately measure the icing capacitance on both sides of the transmission line, thus ensuring the accuracy of the final measurement results.

[0046] In this embodiment, an insulating film is provided between the semi-annular electrode and the surface of the cylinder. This structure can prevent the cylinder itself from affecting the detection capacitance, thereby ensuring monitoring accuracy.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for detecting ice thickness on transmission lines based on ice capacitance, characterized in that: include: A cylinder for icing is set up in the environment of the transmission line under test. A semi-circular electrode is set on the surface of the cylinder. Every two semi-circular electrodes form a group and the two semi-circular electrodes form a detection capacitor. A capacitance detection circuit is constructed, which includes a detection capacitor, a resistor, and a detection inductor. One end of the resistor serves as the excitation input terminal and receives the resonant excitation signal. The other end of the resistor is connected to one end of the detection inductor. The other end of the detection inductor is connected to one end of the detection capacitor. The other end of the detection capacitor is connected to a receiving circuit. The receiving circuit is used to receive the output signal after passing through the capacitance detection circuit and determine the frequency of the cylinder after it is covered with ice based on the signal. The ice capacitance is calculated based on the frequency after icing; and an ice thickness calculation model is constructed based on the ice capacitance to calculate the ice thickness of the transmission line. The ice capacitance value of the cylinder is determined as follows: ； Where: n is the number of detection capacitors, and These are the capacitance values ​​of the i-th detection capacitor on the windward and leeward sides after icing, respectively. and These are the initial values ​​of the i-th detection capacitor on the windward and leeward sides before icing, respectively. The capacitance value of the capacitor after icing is determined as follows: ;in: Let be the capacitance value of the i-th detection capacitor. This is the frequency of the output signal from the capacitance detection circuit.

2. The method for detecting ice thickness on transmission lines based on ice capacitance according to claim 1, characterized in that: The ice thickness calculation model is as follows: ； Where: A is the icing coefficient, and D is the diameter of the transmission line conductor. d is the diameter of the cylinder after it is covered with ice, and d is the thickness of the ice covering the cylinder. ； Where: C is the ice capacitance value of the cylinder. The characteristic coefficient of icing is... This is a characteristic index representing the relationship between ice thickness and capacitance.

3. The method for detecting ice thickness on transmission lines based on ice capacitance according to claim 1, characterized in that: The cylinder is made of the same material and has the same outer diameter as the conductor of the power transmission line being tested, and the cylinder is installed parallel to and at the same height as the power transmission line being tested.

4. The method for detecting ice thickness on transmission lines based on ice capacitance according to claim 3, characterized in that: The number of detection capacitors is n, where n is an even number. n / 2 capacitors are set on the windward side of the cylinder and n / 2 capacitors are set on the leeward side of the cylinder. The detection capacitors on the leeward and windward sides of the cylinder are staggered, and the detection capacitors on the same side of the cylinder are arranged at equal intervals.

5. The method for detecting ice thickness on transmission lines based on ice capacitance according to claim 4, characterized in that: An insulating film is provided between the semi-annular electrode and the surface of the cylinder.

6. The method for detecting ice thickness on transmission lines based on ice capacitance according to claim 1, characterized in that: The receiving circuit is an FDC2112 chip and its peripheral circuits.

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