Composite Insulator Point Temperature Rise Defect Diagnosis Method and Equipment Based on Temperature Rise Curve

Abstract

The present application provides a method and device for judging the type of point temperature rise defect of a composite insulator based on the curve of the surface temperature of the composite insulator changing with time. Only by adding a blowing device on the basis of the original infrared temperature measurement technology, a disturbance is given to the steady-state temperature field where the composite insulator is located. After a period of time, the disturbance is withdrawn, and the data of the temperature of the composite insulator changing with time after the disturbance is withdrawn is recorded and analyzed to distinguish whether the point temperature rise phenomenon of the composite insulator is caused by the heat generation at the interface of the core rod and the sheath or by the heat generation on the surface layer of the sheath.

Description

Technical Field

[0001] This application belongs to the technical field of power systems, and particularly relates to a method for diagnosing point temperature rise defects of composite insulators based on transient temperature rise curves. Background Art

[0002] Composite insulators are widely used in power systems because of their excellent anti-fouling flashover performance. However, the frequent occurrence of abnormal heating problems that may lead to fracture poses a severe challenge to the safe and stable operation of the power grid. There are mainly two reasons for the abnormal heating of composite insulators: the first is the heating at the core rod-sheath interface, which promotes the deterioration of the core rod, resulting in a decline in the mechanical properties of the composite insulator and even fracture; the second is the heating of the sheath surface layer due to water absorption, which has no impact on the mechanical properties of the composite insulator. The abnormal heating phenomenon of composite insulators is usually observed using an infrared thermal imager. According to the different infrared image characteristics observed, the abnormal heating phenomenon of composite insulators can be divided into segment temperature rise and point temperature rise. Composite insulators with segment temperature rise are generally considered to have heating at the core rod-sheath interface, and their core rods have deteriorated. Such composite insulators need to be replaced as soon as possible. For composite insulators with point temperature rise, the reason for their abnormal heating may be either heating at the core rod-sheath interface or heating of the sheath surface layer. Currently, there is a lack of effective on-line detection methods to distinguish between the two.

[0003] The existing abnormal heating detection technology for composite insulators only observes the temperature rise and temperature distribution of composite insulators through infrared images, and the amount of information obtained is difficult to analyze in depth. When the segment temperature rise phenomenon is observed, according to operating experience, it is usually considered that the composite insulator has problems such as core rod-sheath heating, core rod deterioration, and decline in mechanical properties, and it should be replaced as soon as possible. When the point temperature rise phenomenon is observed, since the information reflected by the infrared image is only the surface temperature distribution of the composite insulator, engineers cannot know the internal temperature distribution of the composite insulator, so they cannot determine whether the composite insulator is heating at the core rod-sheath interface or the sheath surface layer, resulting in the safety hazard of heating at the core rod-sheath interface not being dealt with in a timely manner. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to solve the problem that it is difficult to monitor the abnormal heating of composite insulators in the prior art, and thus provide a method and device for diagnosing point temperature rise defects of composite insulators based on transient temperature rise curves. In order to detect defective composite insulators with heating at the core rod-sheath interface as early as possible, and avoid serious safety accidents in the power grid caused by the development of defects and the fracture of composite insulators.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A device for diagnosing point temperature rise defects of composite insulators based on a temperature rise curve, comprising:

[0007] An infrared temperature measuring device for obtaining the temperature rise condition of a composite insulator;

[0008] A timing module for recording the time elapsed during the operation of the infrared temperature measuring device;

[0009] A cooling device for cooling the composite insulator, and the opening or closing of the cooling device can be controlled.

[0010] Preferably, for the composite insulator point temperature rise defect diagnosis device based on the temperature rise curve of the present invention, the infrared temperature measuring device, the timing module, and the cooling device are all carried on an aircraft. This preferred solution utilizes the aircraft to carry each device, facilitating on-site flight surveys.

[0011] Preferably, for the composite insulator point temperature rise defect diagnosis device based on the temperature rise curve of the present invention, the infrared temperature measuring device includes an infrared camera and an airborne infrared thermal imager. The infrared camera is used to photograph the composite insulator to be monitored, and the airborne infrared thermal imager is used to obtain the temperature rise condition of the composite insulator through the infrared camera; the cooling device is an airborne air supply device, and the air outlet of the airborne air supply device is used to align with the composite insulator to be monitored; the timing module is integrated in the airborne infrared thermal imager. This preferred solution uses a drone and supporting airborne equipment, further facilitating the survey.

[0012] A method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve, comprising the following steps:

[0013] The first step: Obtain the temperature recovery change curves of the point temperature rise composite insulators with different parameters and defect positions through experiments, extract the curve features and classify them to obtain the diagnostic criteria for the heating defects of different point temperature rise composite insulators;

[0014] The second step: Detect the on-site point temperature rise abnormally heating composite insulator and measure its temperature recovery change curve. After extracting the curve features, combine the criteria obtained in the first step to judge the type of its heating defect.

[0015] Preferably, for the method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve of the present invention, the first step includes:

[0016] Step a: When the temperature field around the composite insulator is in a stable state, assume that the highest surface temperature point of the composite insulator is A, and the temperature at point A at this time is denoted as T0. Starting from time t0, use a blowing device to blow air on the surface of the composite insulator. Denote the temperature at point A at time t1 as T1. At this time, turn off the blowing device, and the temperature at point A rises and reaches T0 again at time t2. Taking time t1 as the starting point of timing, obtain the relationship diagram between the temperature change amount of point A and time in the time period from t1 to t2, and denote t3 = t2 - t1. Judge the heating position of the point temperature rise composite insulator according to the speed of temperature rise of point A in the time period from 0 to t3.

[0017] Step b: Under the conditions of the same temperature and different position heat sources, obtain multiple relationship diagrams between the temperature change amount of point A and time in the time period from t1 to t2. For the measured relationship curve between the temperature change amount of point A and time, use the function ΔT for fitting. The function ΔT is related to the parameter τ, and τ characterizes the speed of temperature rise of point A during the transient temperature rise process. Then, according to the fact that τ is related to the position x of the internal heat source of the composite insulator, obtain the relationship between τ and x as the criterion for diagnosing the point temperature rise defect of the composite insulator. This preferred solution can facilitate data processing by establishing the relationship diagram between τ and x.

[0018] Preferably, for the method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve of the present invention, C in the fitting function represents the maximum value of the temperature change of point A during the transient temperature rise process, and its value is related to the magnitude and duration of the external interference. This preferred solution provides a suitable fitting function, which is conducive to the fitting accuracy of the parameters.

[0019] Preferably, for the method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve of the present invention, in step b, for a composite insulator with a certain parameter, measure the surface temperature rise curves under the action of the heat source at the core-sheath interface and the heat source on the surface layer of the sheath respectively, extract the characteristics, and obtain the characteristic parameters τ1 and τ2 respectively, and obtain the criterion for diagnosing the point temperature rise of the composite insulator with this parameter:

[0020] For the point temperature rise composite insulator under this parameter, the characteristic parameter of its surface temperature rise curve is τ0; when τ0 is approximately equal to τ1, it is considered that the composite insulator has heat generation at the core-sheath interface; when τ0 is approximately equal to τ2, it is considered that the composite insulator has heat generation on the surface layer of the sheath. This preferred solution provides a quick judgment basis for the heating position based on τ1 and τ2.

[0021] Preferably, for the method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve of the present invention, in the second step, use the above-mentioned device for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve for on-site monitoring. This preferred solution proposes a judgment method using the specific device of the present invention, which is conducive to the implementation of the experimental steps.

[0022] Preferably, for the method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve of the present invention, the second step includes:

[0023] S3. For the composite insulator with point temperature rise, control the UAV to keep a safe distance from the live equipment, adjust the position and attitude of the UAV to make the on-board infrared thermal imager face the highest temperature point on the surface of the heating insulator, start measuring its temperature and timing; after a certain period of time, turn on the on-board air supply device, turn it off after it works for a certain period of time, and continue to measure the temperature for a period of time;

[0024] S4. Transmit the temperature measurement data to the computer, extract the characteristic parameter τ0 corresponding to the composite insulator with measured point temperature rise, and use the criterion for diagnosis.

[0025] This preferred solution takes advantage of the flight convenience of the UAV to facilitate on-site survey.

[0026] Preferably, for the method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve of the present invention, before S3, it further includes:

[0027] S1. Control the UAV to conduct an overall inspection of the primary tower to check whether there are composite insulators with abnormal heating;

[0028] S2. For the composite insulator with abnormal heating, if it shows segment temperature rise, it is determined that there is a core-sheath heating defect; if it shows point temperature rise, enter S3;

[0029] In step S4, steps S2 and S3 are also repeated until the detection of all composite insulators with abnormal heating in this tower is completed.

[0030] This preferred solution first conducts an overall inspection, then judges the type of temperature rise, and then makes a specific judgment on the point temperature rise. The detection is gradually deepened, and it can comprehensively monitor the abnormal temperature rise.

[0031] The beneficial effects of the present invention are:

[0032] By studying the internal heat transfer law of the composite insulator with abnormal heating, the present invention proposes a criterion for diagnosing the type of point temperature rise defect of the composite insulator. Based on this criterion and combined with the non-contact characteristics of the infrared temperature measurement technology, the online diagnosis of the point temperature rise defect of the composite insulator can be achieved, thus effectively preventing the fracture accident of the composite insulator caused by abnormal heating. Brief Description of the Drawings

[0033] The technical solutions of the present application will be further described below with reference to the drawings and embodiments.

[0034] Figure 1 is the radial cross-sectional view of the composite insulator in the embodiment of the present application;

[0035] Figure 2 is the curve graph showing the variation of the highest surface temperature of the composite insulator according to the embodiment of the present application with time;

[0036] Figure 3 is the curve graph showing the temperature change of point A within the time period of t1 to t2 of the composite insulator according to the embodiment of the present application;

[0037] Figure 4 is the curve graph of the temperature recovery change of point A under the action of heat sources at the same temperature but different positions of the composite insulator according to the embodiment of the present application for the measured curve graph of the temperature recovery change of point A;

[0038] Figure 5 is the on-site diagnosis schematic diagram of the point temperature rise defect diagnosis device for the composite insulator based on the transient temperature rise curve according to the embodiment of the present application. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0040] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection scope of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. In this embodiment, if it involves the X, Y, Z directions or the X, Y, Z axes, they are all based on the Cartesian coordinate system.

[0042] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0043] Embodiment 1

[0044] This embodiment provides a method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve.

[0045] Generally speaking, the solution of this embodiment is divided into two steps: The first step is to obtain the temperature recovery change curve of the point temperature rise composite insulator with different parameters and defect positions through experiments, extract the curve characteristics and classify them to obtain the diagnostic criteria for the heating defects of different point temperature rise composite insulators. The second step is to detect the point temperature rise abnormal heating composite insulator on site and measure its temperature recovery change curve. After extracting the curve characteristics, combine the criteria obtained in the first step to judge the type of its heating defect.

[0046] 1. Obtain the criteria for diagnosing the heating defect type of the point temperature rise composite insulator through experiments

[0047] The radial cross-section of the composite insulator in this embodiment is as Figure 1 shown. A one-dimensional coordinate system is established with the center O as the origin in the direction where point A is located.

[0048] Assume that the temperature of the heat source inside the composite insulator is constant. When the temperature field around the composite insulator is in a stable state, assume that the highest temperature point on the surface of the composite insulator is A, and the temperature at point A at this time is denoted as T0; starting from time t0, use a blowing device to blow air on the surface of the composite insulator. Since the heat dissipation condition on the surface of the composite insulator is improved, the temperature at point A will decrease with time; denote the temperature at point A at time t1 as T1. At this time, turn off the blowing device. Since the heat dissipation condition is restored, the temperature at point A will rise and reach T0 again at time t2, and the temperature field around the composite insulator reaches a stable state again. The temperature change curve of point A during the whole process is as Figure 2 shown.

[0049] This solution mainly conducts research on the temperature change curve of point A during the time period from t1 to t2. Taking time t1 as the starting point of timing, draw a graph of the temperature change amount of point A versus time during the time period from t1 to t2 as Figure 3 shown (denote t3 = t2 - t1).

[0050] In Figure 3 , during the time period from 0 to t3, the heat source inside the composite insulator continuously transfers heat to point A. Since heat transfer takes a certain amount of time, if the heat source is closer to point A (assuming that x is slightly less than r2 at this time), the time required for heat to transfer from the heat source to point A is shorter, and the temperature of point A rises faster, as Figure 4 curve 1 shows; if the heat source is farther from point A (assuming that x = r1 at this time), the time required for heat to transfer from the heat source to point A is longer, and the temperature of point A rises slower, as Figure 4As shown by Curve 2. Therefore, the heating position of the point temperature rise composite insulator can be judged according to the speed of temperature rise at Point A during the time period from 0 to t3.

[0051] As Figure 4 shown, for the measured temperature rise change curve of Point A, this solution uses the exponential function for fitting. C in the fitting function represents the maximum value of the temperature change at Point A during the transient process of temperature rise, and its value is related to the magnitude and duration of the external interference; τ characterizes the speed of temperature rise at Point A during the transient process of temperature rise, and its value is related to the position x of the internal heat source in the composite insulator. By obtaining the relationship between τ and x, the criterion for diagnosing the point temperature rise defect of the composite insulator is obtained.

[0052] For a composite insulator with a certain parameter, measure the surface temperature rise curves under the action of a heat source at the core-sheath interface (x = r1) and a heat source on the surface of the sheath (x slightly less than r2) respectively. After extracting the characteristics, obtain the characteristic parameters τ1 and τ2 respectively (the average value can be taken by measuring multiple times), and then the criterion for diagnosing the point temperature rise of the composite insulator with this parameter can be obtained: for the point temperature rise composite insulator under this parameter, the characteristic parameter of its surface temperature rise curve is τ0. When τ0 is approximately equal to τ1, it is considered that the composite insulator has heat generation at the core-sheath interface; when τ0 is approximately equal to τ2, it is considered that the composite insulator has heat generation on the surface of the sheath. Repeat the above steps for composite insulators with different parameters, and the criterion for diagnosing the point temperature rise of various composite insulators can be obtained.

[0053] 2. Detect the heating type of the point temperature rise composite insulator on-site

[0054] After obtaining the criterion for diagnosing the point temperature rise defect of the composite insulator, this criterion can be used to diagnose the heating composite insulator with the phenomenon of point temperature rise on-site. The schematic diagram of on-site diagnosis is as Figure 5 shown.

[0055] Equipment required for on-site detection: One quadcopter drone, one airborne infrared thermal imager adapted to the drone, one airborne air supply device, and one computer.

[0056] Example Two

[0057] This example provides a device for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve, including:

[0058] An infrared temperature measurement device for obtaining the temperature rise situation of the composite insulator;

[0059] A timing module for recording the time elapsed during the operation of the infrared temperature measurement device;

[0060] A cooling device for cooling the composite insulator, and the opening or closing of the cooling device can be controlled.

[0061] Preferably, for the composite insulator point temperature rise defect diagnosis device based on the temperature rise curve in this embodiment, the infrared temperature measurement device, the timing module, and the cooling device are all carried on the aircraft.

[0062] Preferably, for the composite insulator point temperature rise defect diagnosis device based on the temperature rise curve in this embodiment, the infrared temperature measurement device includes an infrared camera and an airborne infrared thermal imager. The infrared camera is used to photograph the composite insulator to be monitored, and the airborne infrared thermal imager is used to obtain the temperature rise condition of the composite insulator through the infrared camera; the cooling device is an airborne air supply device, and the air outlet of the airborne air supply device is used to aim at the composite insulator to be monitored; the timing module is integrated in the airborne infrared thermal imager.

[0063] On-site detection scheme:

[0064] S1, Control the unmanned aerial vehicle (UAV) to conduct an overall inspection of the primary tower to check whether there are composite insulators with abnormal heat generation.

[0065] S2, For the composite insulator with abnormal heat generation, if it shows segment temperature rise, it is determined that there is a core-sheath heat generation defect; if it shows point temperature rise, proceed to step S3.

[0066] S3, For the composite insulator with point temperature rise, control the UAV to keep a safe distance from the live equipment, adjust the position and attitude of the UAV to make the airborne infrared thermal imager directly face the highest point of the surface temperature of the heat-generating insulator, start measuring its temperature and timing. After 5 s, turn on the airborne air supply device, turn it off after it works for 5 s, and continue temperature measurement for 20 s.

[0067] S4, Repeat steps S2 and S3 until the detection of all composite insulators with abnormal heat generation on this tower is completed. Subsequently, transmit the temperature measurement data to the computer, extract the characteristic parameter τ0 corresponding to the composite insulator with measured point temperature rise, and perform diagnosis using the point temperature rise diagnosis criterion corresponding to each composite insulator.

[0068] The technical key points of this embodiment are as follows:

[0069] (1) When studying the criterion, it is necessary to study around the rising section of the temperature change curve ( Figure 2 in the time period of t1 to t2) to exclude the interference of the air convection effect on the surface heat dissipation of the composite insulator in the falling section of the temperature change curve ( Figure 2 in the time period of t0 to t1).

[0070] (2) The key equipment required for this invention is an airborne infrared thermal imager and an airborne air supply device. During the on-site diagnosis process, special attention should be paid to keeping a safe distance between the infrared thermal imager and the air supply device and the live line.

[0071] (3) On-site diagnosis needs to be carried out under windless or light wind conditions to avoid additional influence of the environment on the surface heat dissipation of composite insulators as much as possible.

[0072] Inspired by the ideal embodiments of the present application described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this application. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for diagnosing the point temperature rise defect of a composite insulator based on a temperature rise curve, characterized in that It includes the following steps: The first step: Obtain the temperature recovery change curves of the point temperature rise composite insulators with different parameters and defect positions through experiments, extract the curve features and classify them to obtain the diagnostic criteria for the heating defects of different point temperature rise composite insulators; The second step: Use a diagnostic device for the point temperature rise defects of composite insulators based on the temperature rise curve to conduct on-site monitoring, detect the point temperature rise abnormally heated composite insulators on-site and measure their temperature recovery change curves. After extracting the curve features, combine the criteria obtained in the first step to judge the type of their heating defects; The diagnostic device for the point temperature rise defects of composite insulators based on the temperature rise curve includes: An infrared temperature measurement device for obtaining the temperature rise situation of the composite insulator; A timing module for recording the time elapsed during the operation of the infrared temperature measurement device; A cooling device for cooling the composite insulator, and the opening or closing of the cooling device can be controlled; The first step includes: Step a: When the temperature field around the composite insulator is in a stable state, assume that the highest surface temperature point of the composite insulator is A, and the temperature of point A at this time is recorded as T0; Start blowing air on the surface of the composite insulator using a blowing device from time t0, record the temperature of point A at time t1 as T1, then turn off the blowing device at this time, and the temperature of point A rises back, and reaches T0 again at time t2; Take time t1 as the starting point of timing, obtain the relationship diagram between the temperature change amount of point A and time in the time period from t1 to t2, and record t3 = t2 - t1; Judge the heating position of the point temperature rise composite insulator according to the speed of temperature recovery of point A in the time period from 0 to t3; Step b: Under the conditions of the same temperature and different position heat sources, obtain multiple relationship diagrams between the temperature change amount of point A and time in the time period from t1 to t2. For the measured relationship curve between the temperature change amount of point A and time, use the function ΔT for fitting. The function ΔT is related to the parameter τ, and τ characterizes the speed of temperature recovery of point A in the transient temperature rise process. Then, according to the relationship between τ and the position x of the internal heat source of the composite insulator, obtain the relationship between τ and x as the diagnostic criteria for the point temperature rise defects of the composite insulator.

2. The method for diagnosing the point temperature rise defect of the composite insulator based on the temperature rise curve according to claim 1, wherein In the fitting function, C represents the maximum value of the temperature change at point A during the transient process of temperature rise, and its value is related to the magnitude and duration of the external disturbance.

3. The method for diagnosing the point temperature rise defect of the composite insulator based on the temperature rise curve according to claim 2, characterized in that, In step b, for the composite insulator with a certain parameter, measure its surface temperature recovery curves under the action of the heat source at the core-sheath interface and the heat source on the sheath surface layer respectively. After extracting the features, obtain the characteristic parameters τ1 and τ2 respectively, and obtain the diagnostic criteria for the point temperature rise of the composite insulator with this parameter: For the point temperature rise composite insulator under this parameter, the characteristic parameter of its surface temperature recovery curve is τ0; When τ0 is approximately equal to τ1, it is considered that the composite insulator has heating at the core-sheath interface; When τ0 is approximately equal to τ2, it is considered that the composite insulator has heating on the sheath surface layer.

4. The method for diagnosing the point temperature rise defect of a composite insulator based on a temperature rise curve according to claim 1, wherein, The second step includes: S3: For the composite insulator with point temperature rise, control the drone to keep a safe distance from the live equipment, adjust the position and attitude of the drone so that the on-board infrared thermal imager is directly facing the highest surface temperature point of the heated insulator, start measuring its temperature and timing; After a certain time, turn on the on-board blowing device, wait for it to work for a certain time and then turn it off, and continue to measure the temperature for a period of time; In S4, transmit the temperature measurement data to a computer, extract the characteristic parameter τ0 corresponding to the temperature rise of the composite insulator at the measured point, and perform diagnosis using the criterion.

5. The method for diagnosing the point temperature rise defect of a composite insulator based on a temperature rise curve according to claim 4, characterized in that, Before S3, it also includes: S1, control the drone to conduct an overall inspection of the primary tower to check for composite insulators with abnormal heating. S2, for the composite insulator with abnormal heating, if it shows segment temperature rise, determine that there is a core-sheath heating defect; if it shows point temperature rise, proceed to S3. In step S4, also repeat steps S2 and S3 until the detection of all composite insulators with abnormal heating on this level of tower is completed.

6. The method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve according to claim 1, wherein The infrared temperature measurement device, the timing module, and the cooling device are all carried on the aircraft.

7. The method for diagnosing the point temperature rise defect of a composite insulator based on the temperature rise curve according to claim 1, wherein The infrared temperature measurement device includes an infrared camera and an airborne infrared thermal imager. The infrared camera is used to photograph the composite insulator to be monitored, and the airborne infrared thermal imager is used to obtain the temperature rise situation of the composite insulator through the infrared camera; the cooling device is an airborne air supply device, and the air outlet of the airborne air supply device is aligned with the composite insulator to be monitored; the timing module is integrated in the airborne infrared thermal imager.

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