Lightning stroke detection method and equipment based on TMR sensor array

Abstract

The invention discloses a lightning stroke detection method and device based on a TMR sensor array, and the method and device are used for arranging a first TMR sensor and a second TMR sensor in the horizontal direction close to or away from a telegraph pole, and a fixed distance is formed between the first TMR sensor and the second TMR sensor. First magnetic induction intensity and second magnetic induction intensity which are respectively generated when the first TMR sensor and the second TMR sensor sense the same lightning stroke current magnetic field are sampled in real time, the lightning stroke current magnetic field is generated when the lightning stroke current flows through the telegraph pole, and the current value of the lightning stroke current is calculated according to the first magnetic induction intensity and the second magnetic induction intensity. The lightning stroke current is calculated according to the magnetic induction intensity sensed by the two sensors, the distance between the sensors and the lightning stroke current and the fixed distance adopted by the two sensors do not need to be considered, interference factors are reduced, the sensing sensitivity is high, and the lightning stroke signal on the power distribution network is conveniently and accurately detected.

Description

Technical Field

[0001] The present invention relates to the field of electric power safety technology, and in particular to a lightning strike detection method and device based on a TMR sensor array. Background Art

[0002] Lightning strikes are one of the main factors that threaten the stability of power supply in distribution networks. The distribution network has a complex topology, low insulation level, and poor grounding conditions. Lines are more likely to be damaged by lightning strikes, causing power outages. Effective detection of lightning current is a prerequisite for ensuring the safe operation of distribution networks.

[0003] To this end, there are extensive studies on lightning current detection; some methods are based on electromagnetic transient simulation modeling research. Some methods use fault traveling wave data based on transmission lines to detect lightning signals, some use optical fiber composite overhead ground wires to perform time-frequency feature analysis on lightning signals and non-lightning signals to extract lightning signal features, and some scholars have proposed using Rogowski coils to measure lightning signals.

[0004] However, due to the complexity of the actual distribution network operation, factors such as geographical environment and seasonal changes will affect lightning waves, and the reliability of the simulation-based method is insufficient. The method based on fault traveling wave data has a large amount of calculation. The lightning strike detection method based on optical fiber composite overhead ground wire is limited by the sensitivity of optical fiber. The optical characteristics of optical fiber fluctuate greatly under different temperature environments, resulting in insufficient measurement reliability; the method based on Rogowski coil mutual inductor has poor measurement sensitivity and the detection effect is not ideal. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a lightning strike detection method and device based on a TMR sensor array, which can conveniently and accurately detect lightning strike signals on a distribution network.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A lightning strike detection method based on a TMR sensor array is applied to arrange a first TMR sensor and a second TMR sensor in a horizontal direction close to or far from a utility pole, with a fixed spacing between the first TMR sensor and the second TMR sensor, and is characterized by comprising the following steps: S1, real-time sampling of the first magnetic induction intensity and the second magnetic induction intensity respectively generated by the first TMR sensor and the second TMR sensor sensing the same lightning current magnetic field, wherein the lightning current magnetic field is generated when the lightning current flows through the electric pole; S2. Calculate the current value of the lightning strike current according to the first magnetic induction intensity and the second magnetic induction intensity.

[0007] In order to solve the above technical problems, another technical solution adopted by the present invention is: A lightning strike detection device based on a TMR sensor array includes a processor, a first TMR sensor, a second TMR sensor, and a mounting member for being arranged at a position adjacent to a utility pole; The processor is respectively connected to the first TMR sensor and the second TMR sensor for communication, the first TMR sensor and the second TMR sensor are distributed on the mounting member along a first straight line direction, and the distance between the first TMR sensor and the second TMR sensor is fixed; When the mounting piece is installed, the first straight line direction is a horizontal direction close to or away from the utility pole, and the processor is used to execute the above-mentioned lightning strike detection method based on the TMR sensor array.

[0008] The beneficial effects of the present invention are as follows: a lightning detection method and device based on a TMR sensor array are provided, a first TMR sensor and a second TMR sensor with a fixed spacing are arranged near a utility pole, after a lightning current flows through the utility pole, the first TMR sensor and the second TMR sensor sense the magnetic field of the lightning current, and the lightning current is calculated according to the magnetic induction intensity sensed by the two sensors, without considering the distance between the sensor and the lightning current and the fixed spacing between the two sensors, thereby reducing interference factors, having high induction sensitivity, and conveniently and accurately detecting lightning signals on a distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of the steps of a lightning strike detection method based on a TMR sensor array of the present invention; Figure 2 A schematic diagram of the positional relationship between a lightning strike detection device based on a TMR sensor array and a utility pole according to the present invention; Figure 3 It is a schematic diagram of a simulation model of a lightning strike detection method based on a TMR sensor array of the present invention.

[0010] Description of labels: 1. The first TMR sensor; 2. The second TMR sensor; 3. The field signal acquisition board; 4. The electric pole; 5. Simulation of the first TMR sensor; 6. Simulation of the second TMR sensor; 7. Simulation of the electric pole. DETAILED DESCRIPTION

[0011] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0012] Please refer to Figures 1 to 3A lightning strike detection method based on a TMR sensor array is applied to arrange a first TMR sensor 1 and a second TMR sensor 2 in a horizontal direction close to or far away from a power pole 4, with a fixed spacing between the first TMR sensor 1 and the second TMR sensor 2, characterized in that it includes the following steps: S1, real-time sampling of the first magnetic induction intensity and the second magnetic induction intensity respectively generated by the first TMR sensor 1 and the second TMR sensor 2 sensing the same lightning current magnetic field, wherein the lightning current magnetic field is generated when the lightning current flows through the electric pole 4; S2. Calculate the current value of the lightning strike current according to the first magnetic induction intensity and the second magnetic induction intensity.

[0013] From the above description, it can be seen that the beneficial effects of the present invention are: a first TMR sensor 1 and a second TMR sensor 2 with a fixed spacing are arranged near the utility pole 4, and after the lightning current flows through the utility pole 4, the first TMR sensor 1 and the second TMR sensor 2 sense the magnetic field of the lightning current, and the lightning current is calculated according to the magnetic induction intensity sensed by the two sensors, without considering the distance between the sensor and the lightning current and the fixed spacing between the two sensors, thereby reducing interference factors, having high induction sensitivity, and conveniently and accurately detecting lightning signals on the distribution network.

[0014] Furthermore, the step S2 is specifically as follows: Substituting the first magnetic induction intensity B1 and the second magnetic induction intensity B2 into the lightning current calculation formula, the current value of the lightning current I is obtained. The lightning current calculation formula is expressed as follows: ; in, represents the fixed spacing, Represents the magnetic permeability of vacuum.

[0015] From the above description, it can be seen that a lightning current calculation formula is created so that the magnitude of the lightning current is only related to the first magnetic induction intensity and the second magnetic induction intensity, and a fixed distance is maintained between the first TMR sensor 1 and the second TMR sensor 2, thereby reducing equipment installation requirements and improving safety; two TMR sensors detect lightning current at the same time, which can eliminate noise signal interference and improve measurement accuracy.

[0016] Furthermore, it also includes: S0, remote communication connection to the on-site signal acquisition board 3 located near the electric pole; The step S1 specifically includes: acquiring the first magnetic induction intensity and the second magnetic induction intensity through the field signal acquisition board 3 .

[0017] From the above description, it can be seen that a field signal acquisition board 3 is set near the electric pole 4, and the first magnetic induction intensity and the second magnetic induction intensity collected by the field signal acquisition board 3 are acquired by remote communication, which can not only ensure the personal safety of equipment users, but also facilitate centralized management of lightning detection equipment installed in multiple locations.

[0018] Furthermore, before step S1, the following steps are also included: Constructing a lightning current detection simulation model having a simulated first TMR sensor 5, a simulated second TMR sensor 6, and a simulated utility pole 7; Applying a preset simulated current to the simulated electric pole 7, and calculating a theoretical lightning current according to the detection results of the simulated first TMR sensor 5 and the simulated second TMR sensor 6; A lightning current detection error is obtained according to the preset simulated current and the theoretical lightning current.

[0019] From the above description, it can be seen that a lightning strike current detection simulation model is set on the software, and the lightning strike process is simulated by presetting the simulated current, and then combined with the detection results of the simulated first TMR sensor 5 and the simulated second TMR sensor 6, the effectiveness of the lightning strike detection method is verified. At the same time, the theoretical errors existing in the method can be qualitatively analyzed to help improve the accuracy of the actual detection results.

[0020] Furthermore, before step S1, the following steps are also included: Confirm whether the first TMR sensor 1 and the second TMR sensor 2 are both connected to the grounding wire adjacent to the utility pole 4. If so, execute step S1.

[0021] It can be seen from the above description that after installing the first TMR sensor 1 and the second TMR sensor 2, it is determined that the sensors are connected to the ground wire to improve the safety of the measurement.

[0022] Please refer to Figure 2 , a lightning strike detection device based on a TMR sensor array, comprising a processor, a first TMR sensor 1, a second TMR sensor 2, and a mounting member for being arranged at a position adjacent to a utility pole 4; The processor is respectively connected to the first TMR sensor 1 and the second TMR sensor 2 for communication, the first TMR sensor 1 and the second TMR sensor 2 are distributed on the mounting member along a first straight line direction, and the distance between the first TMR sensor 1 and the second TMR sensor 2 is fixed; When the mounting member is installed, the first straight line direction is a horizontal direction close to or away from the electric pole 4, and the processor is used to execute the above-mentioned lightning strike detection method based on the TMR sensor array.

[0023] From the above description, it can be seen that the beneficial effects of the present invention are: a first TMR sensor 1 and a second TMR sensor 2 with a fixed spacing are arranged near the utility pole 4, and after the lightning current flows through the utility pole 4, the first TMR sensor 1 and the second TMR sensor 2 sense the magnetic field of the lightning current, and the lightning current is calculated according to the magnetic induction intensity sensed by the two sensors, without considering the distance between the sensor and the lightning current and the fixed spacing between the two sensors, thereby reducing interference factors, having high induction sensitivity, and conveniently and accurately detecting lightning signals on the distribution network.

[0024] Furthermore, a field signal acquisition board 3 is provided on the mounting member; The field signal acquisition board 3 is communicatively connected to the first TMR sensor 1 and the second TMR sensor 2 respectively, and the processor is communicatively connected to the field signal acquisition board 3 .

[0025] From the above description, it can be seen that a field signal acquisition board 3 is set near the electric pole 4, and the first magnetic induction intensity and the second magnetic induction intensity collected by the field signal acquisition board 3 are acquired by remote communication, which can not only ensure the personal safety of equipment users, but also facilitate centralized management of lightning detection equipment installed in multiple locations.

[0026] Furthermore, the first TMR sensor 1 and the second TMR sensor 2 are symmetrically distributed relative to the field signal acquisition board 3 .

[0027] From the above description, it can be seen that the first TMR sensor 1 and the second TMR sensor 2 are symmetrically arranged to facilitate wiring, and the signal acquisition board is located between the two, that is, the space occupied by the fixed spacing, reducing the space volume of the device.

[0028] Furthermore, the mounting piece is provided with a mounting portion for adapting a ground wire.

[0029] From the above description, it can be seen that the installation part is provided so as to connect the device to any position on the grounding line, which is convenient, and the first TMR sensor 1 and the second TMR sensor 2 are grounded, thereby improving safety.

[0030] Further, it also includes a lightning strike warning piece; The lightning strike warning component is arranged on the mounting component, and the lightning strike warning component is electrically connected to the on-site signal acquisition board 3 .

[0031] From the above description, it can be known that a lightning strike warning member is provided, and after detecting that a lightning strike current passes through the electric pole 4, a warning feedback can be given through the lightning strike warning member to alert nearby personnel.

[0032] Please refer to Figures 1 to 3 , Embodiment 1 of the present invention is: A lightning strike detection method based on a TMR sensor array is applied to arrange a first TMR sensor 1 and a second TMR sensor 2 in a horizontal direction close to or far from a power pole 4, with a fixed spacing between the first TMR sensor 1 and the second TMR sensor 2, comprising the following steps: S0, remotely communicating with a field signal acquisition board 3 located near the electric pole, the field signal acquisition board 3 is respectively connected to the first TMR sensor 1 and the second TMR sensor 2 in communication; and, for safety reasons, confirming whether the first TMR sensor 1 and the second TMR sensor 2 are both connected to the ground wire of the adjacent electric pole 4, if so, executing step S1; S1, real-time sampling of the first magnetic induction intensity and the second magnetic induction intensity respectively generated by the first TMR sensor 1 and the second TMR sensor 2 induction the same lightning current magnetic field through the field signal acquisition board 3, the lightning current magnetic field is generated when the lightning current flows through the electric pole 4; In this embodiment, when the lightning current flows through the electric pole 4, a magnetic field with a fixed direction is generated in space, namely, the lightning current magnetic field; the first TMR sensor 1 and the second TMR sensor 2 respectively sense different magnetic induction intensities, namely, the first magnetic induction intensity and the second magnetic induction intensity are obtained.

[0033] S2. Calculate the current value of the lightning current according to the first magnetic induction intensity and the second magnetic induction intensity, specifically: Substituting the first magnetic induction intensity B1 and the second magnetic induction intensity B2 into the lightning current calculation formula, the current value of the lightning current I is obtained. The lightning current calculation formula is expressed as follows: (1) in, Indicates fixed spacing, =4π×10-7N / A2 represents the magnetic permeability of vacuum.

[0034] The derivation process of the lightning current calculation formula is as follows: First, the sensor closest to the utility pole 4 among the first TMR sensor 1 and the second TMR sensor 2 is the first TMR sensor 1; assuming that the distance between the first TMR sensor 1 and the utility pole 4 is R1, the distance between the second TMR sensor 2 and the utility pole 4 is R1+△r. When the lightning current I flows through the utility pole 4, the first magnetic induction intensity sensed by the TMR sensor 1 is: (2) Where μ0 is the magnetic permeability of vacuum.

[0035] The magnetic induction intensity B2 sensed by the second TMR sensor 22 is: (3) Then, make changes to formulas (2) and (3): (4) Combining the two terms in equation (4), we get: (5) Finally, transform equation (5) to obtain equation (1).

[0036] In this embodiment, if Figure 3 As shown, a lightning current detection simulation model with a simulated first TMR sensor 5, a simulated second TMR sensor 6 and a simulated utility pole 7 is constructed based on Maxwell; a preset simulated current is applied to the simulated utility pole 7, and a theoretical lightning current is calculated according to the detection results of the simulated first TMR sensor 5 and the simulated second TMR sensor 6; a lightning current detection error is obtained according to the preset simulated current and the theoretical lightning current. The simulation process is exemplified as follows: A lightning strike (DC) current of 5kA / 20kA is applied to the simulated electric pole 7, respectively, and the detection results of the simulated first TMR sensor 5 and the simulated second TMR sensor 6 and the lightning strike current calculated according to formula (1) are obtained, as shown in Table 1:

[0037] Table 1 Simulation verification and calculation results It can be seen that the calculation error of the lightning current is less than 2.5%, which verifies the effectiveness of this embodiment.

[0038] Please refer to Figure 2 , Embodiment 2 of the present invention is: A lightning strike detection device based on a TMR sensor array comprises a processor, a first TMR sensor 1, a second TMR sensor 2 and a mounting member used to be arranged at a position adjacent to a power pole 4; the processor is respectively connected to the first TMR sensor 1 and the second TMR sensor 2 for communication, the first TMR sensor 1 and the second TMR sensor 2 are distributed and arranged on the mounting member along a first straight line direction, and the spacing between the first TMR sensor 1 and the second TMR sensor 2 is fixed; when the mounting member is installed, the first straight line direction is a horizontal direction close to or away from the power pole 4, and the processor is used to execute a lightning strike detection method based on a TMR sensor array according to embodiment 1.

[0039] In this embodiment, if Figure 2As shown, a field signal acquisition board 3 is provided on the mounting member; the field signal acquisition board 3 is respectively connected to the first TMR sensor 1 and the second TMR sensor 2 in communication, and the processor is connected to the field signal acquisition board 3 in communication. The first TMR sensor 1 and the second TMR sensor 2 are symmetrically arranged relative to the field signal acquisition board 3; preferably, the first TMR sensor 1 and the second TMR sensor 2 are respectively arranged at both ends of the field signal acquisition board 3. In addition, a mounting portion for adapting to the grounding wire is provided on the mounting member, so that the device can be installed at any position of the grounding wire.

[0040] In this embodiment, the equipment may be provided with a lightning strike warning component, which is provided on the mounting component and is electrically connected to the on-site signal collection board 3 .

[0041] In summary, the present invention provides a lightning strike detection method and device based on a TMR sensor array, wherein a first TMR sensor and a second TMR sensor with a fixed spacing are arranged near a utility pole. After a lightning current flows through the utility pole, the first TMR sensor and the second TMR sensor sense the magnetic field of the lightning current, and the lightning current is calculated according to the magnetic induction intensity sensed by the two sensors. There is no need to consider the distance between the sensor and the lightning current and the fixed spacing between the two sensors, thereby reducing interference factors. The method and device can be installed at any position of the grounding wire, have high induction sensitivity, and can conveniently and accurately detect lightning strike signals on the distribution network.

[0042] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lightning strike detection method based on a TMR sensor array, which is applied to arrange a first TMR sensor and a second TMR sensor in a horizontal direction close to or far away from a utility pole, with a fixed spacing between the first TMR sensor and the second TMR sensor, characterized in that: The steps include: S1, real-time sampling of the first magnetic induction intensity and the second magnetic induction intensity respectively generated by the first TMR sensor and the second TMR sensor sensing the same lightning current magnetic field, wherein the lightning current magnetic field is generated when the lightning current flows through the electric pole; S2. Calculate the current value of the lightning current according to the first magnetic induction intensity and the second magnetic induction intensity.

2. A lightning strike detection method based on a TMR sensor array according to claim 1, characterized in that: The step S2 is specifically as follows: Substituting the first magnetic induction intensity B1 and the second magnetic induction intensity B2 into the lightning current calculation formula, the current value of the lightning current I is obtained. The lightning current calculation formula is expressed as follows: ； in, represents the fixed spacing, Represents the magnetic permeability of vacuum.

3. A lightning strike detection method based on a TMR sensor array according to claim 1, characterized in that: Also includes: S0, remote communication connection to the on-site signal acquisition board located near the utility pole; The step S1 specifically includes: acquiring the first magnetic induction intensity and the second magnetic induction intensity through the field signal acquisition board.

4. A lightning strike detection method based on a TMR sensor array according to claim 1, characterized in that: Before step S1, the following steps are also included: Constructing a lightning current detection simulation model having a simulated first TMR sensor, a simulated second TMR sensor, and a simulated utility pole; Applying a preset simulated current to the simulated electric pole, and calculating a theoretical lightning strike current according to the detection results of the simulated first TMR sensor and the simulated second TMR sensor; A lightning current detection error is obtained according to the preset simulated current and the theoretical lightning current.

5. The lightning strike detection method based on TMR sensor array according to claim 1, characterized in that: Before step S1, the following steps are also included: Confirm whether the first TMR sensor and the second TMR sensor are both connected to a grounding wire adjacent to the utility pole; if so, execute step S1.

6. A lightning strike detection device based on a TMR sensor array, characterized in that: The device comprises a processor, a first TMR sensor, a second TMR sensor, and a mounting member for being disposed at a location adjacent to a utility pole; The processor is respectively connected to the first TMR sensor and the second TMR sensor for communication, the first TMR sensor and the second TMR sensor are distributed on the mounting member along a first straight line direction, and the distance between the first TMR sensor and the second TMR sensor is fixed; When the mounting piece is installed, the first straight line direction is a horizontal direction close to or away from the utility pole, and the processor is used to execute a lightning strike detection method based on a TMR sensor array as described in any one of claims 1 to 5.

7. A lightning strike detection device based on a TMR sensor array according to claim 6, characterized in that: The mounting piece is provided with a field signal acquisition board; The field signal acquisition board is communicatively connected to the first TMR sensor and the second TMR sensor respectively, and the processor is communicatively connected to the field signal acquisition board.

8. The lightning strike detection device based on the TMR sensor array according to claim 7, characterized in that: The first TMR sensor and the second TMR sensor are symmetrically distributed relative to the field signal acquisition board.

9. The lightning strike detection device based on TMR sensor array according to claim 6, characterized in that: The mounting piece is provided with a mounting portion for adapting a ground wire.

10. The lightning strike detection device based on TMR sensor array according to claim 7, characterized in that: Also includes lightning strike warning parts; The lightning strike warning component is arranged on the mounting component, and the lightning strike warning component is electrically connected to the on-site signal collection board.

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