A kind of live detection device for internal insulation defect of pole-mounted transformer

Abstract

The application discloses a kind of live detection devices of pole-mounted transformer internal insulation defects, including acquisition terminal, telescopic insulating rod, intelligent analysis terminal;The first side of acquisition terminal is provided with acoustic sensor and is used to adsorb to the surface of pole-mounted transformer adsorption component, and acoustic sensor is used to collect voiceprint partial discharge signal;The top of insulating rod is provided with connecting component for disassembling acquisition terminal;Intelligent analysis terminal is connected with acquisition terminal, for whether there is insulation defect in pole-mounted transformer according to voiceprint partial discharge signal analysis inside.The above-mentioned live detection device of pole-mounted transformer internal insulation defect can quickly and conveniently contact live detection to pole-mounted transformer, avoid the interface effect of box and air and air absorption attenuation, improve the anti-electromagnetic interference ability, accurately determine the internal insulation fault of transformer, improve detection sensitivity and accuracy, eliminate security risks as soon as possible, avoid transformer explosion.

Description

Technical Field

[0001] This utility model relates to the field of power inspection equipment technology, and more specifically, to a live detection device for internal insulation defects of pole-mounted transformers. Background Technology

[0002] Pole-mounted transformers are critical units in power distribution networks, and their proper operation directly affects the reliability of power supply to users. Because pole-mounted transformers operate outdoors, the environmental conditions are extremely harsh, and the manufacturing processes vary widely, making them prone to defects and leading to malfunctions. More than half of the faults in pole-mounted transformers are insulation faults. Traditional inspection equipment such as infrared thermography and ultraviolet imaging cannot detect insulation defects inside the transformer. Using oil chromatography requires taking oil samples after the transformer is shut down for testing, which is time-consuming and necessitates power outages, disrupting normal power supply to users.

[0003] It should be noted that partial discharge is an important indicator reflecting the insulation condition of power equipment. Essentially, it is a localized breakdown phenomenon of the insulating medium under high electric field strength. Due to its unique structural design and operating environment, pole-mounted transformers exhibit the following significant characteristics of partial discharge: Firstly, the oil-paper insulation structure is prone to microscopic defects such as delamination and cracking under long-term exposure to multiple stresses from heat, electricity, and mechanical forces. Secondly, external factors such as sudden temperature changes, condensation, and pollution in the outdoor environment further accelerate the deterioration process of the insulation material. More seriously, pole-mounted transformers are typically installed at high altitudes on utility poles, and due to limitations in detection conditions and maintenance methods, it is difficult to detect potential internal partial discharge hazards in a timely manner. This can ultimately lead to serious accidents such as insulation breakdown or even equipment explosion, posing a severe threat to the safe operation of the power distribution network.

[0004] Pole-mounted transformers emit acoustic partial discharge signals during operation, which contain a wealth of status information about the transformer. When a fault occurs, the sound signal changes accordingly. In addition to ultrasonic waves, partial discharge faults in distribution transformers also generate audible sound signals. Therefore, traditional single-frequency acoustic sensors cannot accurately detect these signals. Furthermore, compared to the partial discharge signals of the main transformer, the partial discharge signals of pole-mounted transformers are more susceptible to environmental interference, have smaller amplitudes (an order of magnitude lower than those of the main transformer), and exhibit different frequency characteristics (15kHz to 60kHz, a very low frequency band interspersed with audible sounds). This makes extracting the detection characteristics of the partial discharge signals from pole-mounted transformers more difficult.

[0005] Therefore, there is an urgent need to develop a technology that can perform multi-band acoustic partial discharge detection on pole-mounted transformers to accurately identify insulation faults inside the transformers, eliminate safety hazards as early as possible, and prevent transformer explosions. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a live-line detection device for internal insulation defects in pole-mounted transformers. This device enables rapid and convenient contact-type live-line detection of pole-mounted transformers, avoiding the interface effect between the transformer housing and air, as well as air absorption attenuation. It also enhances electromagnetic interference resistance, accurately identifies internal insulation faults in the transformer, improves detection sensitivity and accuracy, eliminates safety hazards early, and prevents transformer explosions.

[0007] This utility model provides a live detection device for internal insulation defects of a pole-mounted transformer, including a data acquisition terminal, a telescopic insulating rod, and an intelligent analysis terminal;

[0008] An acoustic sensor and an adsorption component for adsorbing onto the surface of the pole-mounted transformer are provided on the first side of the acquisition terminal. The acoustic sensor is used to acquire the acoustic partial discharge signal of the pole-mounted transformer.

[0009] The top end of the insulating rod is provided with a connecting component for assembling and disassembling the data acquisition terminal;

[0010] The intelligent analysis terminal is communicatively connected to the acquisition terminal and is used to analyze whether there are insulation defects inside the pole-mounted transformer based on the acoustic partial discharge signal transmitted by the acquisition terminal.

[0011] Preferably, in the above-mentioned live detection device for internal insulation defects of pole-mounted transformers, the adsorption component is a permanent magnet component.

[0012] Preferably, in the above-mentioned live detection device for internal insulation defects of pole-mounted transformers, the number of adsorption components is two, and the acoustic sensor is disposed between the two adsorption components.

[0013] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, an adsorption detection sensor is also provided next to the adsorption component, and an adsorption status indicator is also provided on the acquisition terminal. The adsorption detection sensor is communicatively connected to the adsorption status indicator to transmit adsorption status information to the adsorption status indicator, and the adsorption status indicator is used to display the adsorption status.

[0014] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, a fall arrestor ring for attaching a rope is also provided on the second side of the acquisition terminal perpendicular to the first side, and the rope is arranged along the direction of the insulating rod. A plurality of constraint rings for constraining the rope to the rod are also arranged sequentially on the insulating rod.

[0015] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, an auxiliary indicator light strip and a function indicator light are further provided on the third side of the acquisition terminal opposite to the first side. The auxiliary indicator light strip is used to indicate the current communication status of the acquisition terminal, and the function indicator light is used to indicate the power-on / off status of the acquisition terminal.

[0016] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, the number of acquisition terminals is at least four.

[0017] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, the connecting component at the top of the insulating rod is an electromagnet.

[0018] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, the connecting component at the top of the insulating rod is a clamp with a buckle.

[0019] Preferably, in the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, the insulating rod includes an epoxy glass resin rod body with an adjustable length of 1.2 meters to 3.2 meters. The bottom end of the rod body is wrapped with insulating rubber, and a universal rod assembly is fixed to the top end of the rod body. The other end of the universal rod assembly is used to set the connecting component.

[0020] As can be seen from the above technical solution, the live-line detection device for internal insulation defects of the pole-mounted transformer provided by this utility model includes a data acquisition terminal, a telescopic insulating rod, and an intelligent analysis terminal. The first side of the data acquisition terminal is equipped with an acoustic sensor and an adsorption component for adsorbing onto the surface of the pole-mounted transformer. The acoustic sensor is used to acquire the acoustic partial discharge signal of the pole-mounted transformer. The top of the insulating rod is equipped with a connecting component for detaching and assembling the data acquisition terminal. The intelligent analysis terminal is communicatively connected to the data acquisition terminal and is used to analyze whether there are insulation defects inside the pole-mounted transformer based on the acoustic partial discharge signal transmitted by the data acquisition terminal. As can be seen, this allows the acquisition terminal to be attached to the surface of the pole-mounted transformer using a telescopic insulating rod, and held for a certain period of time to acquire the acoustic partial discharge signal of the pole-mounted transformer and transmit it to the intelligent analysis terminal. After acquisition, the acquisition terminal can be separated from the pole-mounted transformer using the insulating rod. Therefore, this device can quickly and conveniently perform contact-type live detection on pole-mounted transformers, avoiding the interface effect between the enclosure and the air, as well as air absorption attenuation, improving detection sensitivity and accuracy, enhancing anti-electromagnetic interference capabilities, more accurately identifying insulation faults inside the transformer, eliminating safety hazards early, and preventing transformer explosions. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 An overall block diagram of an embodiment of a live-line detection device for internal insulation defects of a pole-mounted transformer provided by this utility model;

[0023] Figure 2 A schematic diagram of the data acquisition terminal for an embodiment of a live-line detection device for internal insulation defects in a pole-mounted transformer provided by this utility model;

[0024] Figure 3 A schematic diagram of the insulating rod of the live detection device for internal insulation defects of pole-mounted transformers provided by this utility model. Detailed Implementation

[0025] The core of this utility model is to provide a live-line detection device for internal insulation defects of pole-mounted transformers. It can quickly and conveniently perform contact-type live-line detection on pole-mounted transformers, avoid the interface effect between the tank and the air and air absorption attenuation, improve the anti-electromagnetic interference capability, accurately determine the internal insulation faults of the transformer, improve detection sensitivity and accuracy, eliminate safety hazards in a timely manner, and prevent transformer explosions.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] An example implementation of the live-line detection device for internal insulation defects in a pole-mounted transformer provided by this utility model. Figure 1 and Figure 2 As shown, Figure 1 This is an overall block diagram of an embodiment of a live-line detection device for internal insulation defects in a pole-mounted transformer provided by this utility model. Figure 2 This is a schematic diagram of the data acquisition terminal of an embodiment of a live detection device for internal insulation defects of a pole-mounted transformer provided by the present invention. The live detection device for internal insulation defects of a pole-mounted transformer may include a data acquisition terminal 1, a telescopic insulating rod 2, and an intelligent analysis terminal 3. In this way, the operator can install the data acquisition terminal 1 on the top of the insulating rod 2, and then hold the bottom end of the insulating rod 2 and place the data acquisition terminal 1 at the location of the pole-mounted transformer.

[0028] The first side of the acquisition terminal 1 is equipped with an acoustic sensor 11 and an adsorption component 12 for adsorbing onto the surface of the pole-mounted transformer. The specific adsorption method is not limited; it can be adsorbed by a permanent magnet or an electromagnet, as long as the adsorption state can be maintained for a sufficient signal acquisition time. This time is generally selected as 15 minutes. This acoustic sensor 11 is used to acquire the acoustic partial discharge signal of the pole-mounted transformer. Multi-band acoustic partial discharge signal detection can be used, that is, an acoustic sensor that can simultaneously cover the frequency band from 15kHz to 60kHz can be used. Among them, 15kHz to 20kHz is the audible sound wave band, and 20kHz to 60kHz is the ultrasonic frequency band. It can be seen that this realizes the acquisition of contact acoustic partial discharge signal, and it will no longer be affected by the interference of sound waves in the air, as in the existing technology where the acquisition terminal is held in the hand and collected remotely. Thus, the acquired data is more accurate.

[0029] The top of the insulating rod 2 is equipped with a connecting component 21 for attaching and detaching the data acquisition terminal 1. This connecting component 21 only needs to ensure that the data acquisition terminal 1 can be easily installed onto and removed from the insulating rod 2. This allows the data acquisition terminal 1 to be quickly attached to the surface of a high-mounted pole-mounted transformer without requiring personnel to carry ladders or other equipment for climbing. This solves the problem of inconvenience in attaching the data acquisition terminal 1 to the surface of the pole-mounted transformer in existing technologies. Specifically, the connecting component 21 at the top of the insulating rod 2 can preferably be an electromagnet. When energized, it can attract the data acquisition terminal 1, allowing the insulating rod 2 to transport the data acquisition terminal 1 upwards to approach the pole-mounted transformer. Then, the data acquisition terminal 1 can be attached to the surface of the pole-mounted transformer. Disconnecting the electromagnet allows the insulating rod 2 to be connected to the data acquisition terminal 1. Terminal 1 is separated, allowing it to collect partial discharge signals while stationary. The operator can then use the insulating rod 2 to continue the same operation, placing other acquisition terminals 1 onto the surfaces of other pole-mounted transformers for signal collection. This eliminates the need for numerous insulating rods 2. In another example, the connecting component 21 at the top of the insulating rod 2 can preferably be a clamp with a snap-fit. In this case, a control component corresponding to this clamp can be provided at the bottom of the insulating rod 2. The operator can open and close the clamp at the top by controlling the control component. After the acquisition terminal 1 is attached to the pole-mounted transformer, the operator can use the control component to separate the insulating rod 2 from the acquisition terminal 1, remove the insulating rod 2 separately, and place other acquisition terminals 1.

[0030] The intelligent analysis terminal 3 communicates with the acquisition terminal 1, specifically using either wired or wireless communication, which is not limited here. This allows for convenient data acquisition on-site. It is used to analyze whether there are insulation defects inside the pole-mounted transformer based on the acoustic partial discharge signal transmitted by the acquisition terminal 1. It should be noted that this analysis method is an existing mature technology, and the solution in this embodiment does not improve this analysis method. It can be seen that the acquired signal avoids interference from sound waves in the air, thereby enabling faster and more accurate judgment of insulation defects in the transformer, greatly improving maintenance efficiency. In other words, this embodiment provides a more effective way to check internal faults in transformers. This intelligent analysis terminal 3 can display the acoustic feature spectrum in real time, provide the partial discharge fault detection results of the pole-mounted distribution transformer, support one-click generation of detection reports, save historical detection results of multiple measurement points, and realize the historical record viewing function.

[0031] It should also be noted that the number of the above-mentioned acquisition terminals 1 can be at least 4. Two measurement points can be selected on the high-voltage side and the low-voltage side of the pole-mounted transformer casing, and at least one acquisition terminal 1 can be set at each measurement point. Generally speaking, ultrasonic waves have a relatively large attenuation, so the more densely the acquisition points are, the better. If an abnormality is found, the measurement should be more dense, which means that the number of acquisition terminals 1 used on each pole-mounted transformer can be increased.

[0032] As can be seen from the above technical solution, in the embodiment of the live-line detection device for internal insulation defects of pole-mounted transformers provided by this utility model, a data acquisition terminal, a telescopic insulating rod, and an intelligent analysis terminal are included. The first side of the data acquisition terminal is equipped with an acoustic sensor and an adsorption component for adsorbing onto the surface of the pole-mounted transformer. The acoustic sensor is used to acquire the acoustic partial discharge signal of the pole-mounted transformer. The top of the insulating rod is equipped with a connecting component for detaching and assembling the data acquisition terminal. The intelligent analysis terminal is communicatively connected to the data acquisition terminal and is used to analyze whether there are insulation defects inside the pole-mounted transformer based on the acoustic partial discharge signal transmitted by the data acquisition terminal. Thus, the telescopic insulating rod can be used to first adsorb the data acquisition terminal onto the surface of the pole-mounted transformer and maintain it for a certain period of time, allowing it to acquire the acoustic partial discharge signal and transmit it to the intelligent analysis terminal. After acquisition, the insulating rod can be used to separate the data acquisition terminal from the pole-mounted transformer. Therefore, this device can quickly and conveniently perform contact-type live-line detection on pole-mounted transformers, improving detection sensitivity and accuracy, enhancing anti-electromagnetic interference capabilities, avoiding the interface effect between the enclosure and air, and air absorption attenuation, more accurately determining the internal insulation faults of the transformer, eliminating safety hazards early, and preventing transformer explosions.

[0033] In a specific embodiment of the above-mentioned live detection device for insulation defects inside pole-mounted transformers, the adsorption component 12 can be a permanent magnet component, specifically a neodymium iron boron (NdFeB) component, a samarium cobalt (SmCo) component, an alnico (AlNiCo) component, or a ferrite component, as long as it can achieve stable adsorption and can be easily removed when needed. Of course, in some other cases, a suitable type of adsorption component can be used, as long as it is detachable, because it is necessary to ensure that after the acquisition terminal 1 has finished detecting one pole-mounted transformer, it can continue to adsorb onto another pole-mounted transformer for further detection.

[0034] In another specific embodiment of the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, refer to... Figure 2The number of adsorption components 12 can be two, and the acoustic sensor 11 can be positioned between the two adsorption components 12. In this case, using two adsorption components 12 can prevent the acquisition terminal 1 from rotating during adsorption, thereby ensuring complete stillness during signal acquisition and avoiding interference from other signals. Moreover, placing the acoustic sensor 11 between the two adsorption components 2 can ensure a tighter adhesion between the acoustic sensor 11 and the surface of the transformer on the column. This seamless adhesion can further improve the anti-interference performance of signal acquisition.

[0035] In another specific embodiment of the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, refer to... Figure 2 Adsorption detection sensor 13 can be installed next to the adsorption component 12 to further determine whether effective adsorption has been achieved. Furthermore, the data acquisition terminal 1 can be equipped with an adsorption status indicator. The adsorption detection sensor 13 is communicatively connected to the adsorption status indicator to transmit adsorption status information to the indicator, which displays the adsorption status. Based on this structure, maintenance personnel located below the pole-mounted transformer can remotely determine whether effective adsorption has occurred at a given time. If effective adsorption fails, timely countermeasures can be taken, such as changing the adsorption location, to achieve effective adsorption as quickly as possible, thereby further improving maintenance efficiency. Additionally, Figure 2 The device also showcases a clamp detection sensor 14 and a power button 15. The clamp detection sensor 14 can detect whether the clamp has been successfully clamped. If it has not been successfully clamped, it will send an alarm signal. The power button 15 is used to turn the device on or off.

[0036] In a preferred embodiment of the above-mentioned live-line detection device for internal insulation defects of the pole-mounted transformer, a fall arrestor ring for attaching a rope can be provided on the second side of the data acquisition terminal 1, which is perpendicular to the first side. The rope is arranged along the direction of the insulating rod 2, and multiple constraint rings for restraining the rope to the rod are sequentially provided on the rod 2. In this case, the data acquisition terminal 1 can be better prevented from falling during data acquisition. Even if the data acquisition terminal 1 separates from the pole-mounted transformer due to shaking, it can be suspended in mid-air by the rope, preventing the data acquisition terminal 1 from falling directly to the ground and causing damage.

[0037] In another preferred embodiment of the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, an auxiliary indicator light strip and a function indicator light strip can also be provided on the third side of the acquisition terminal 1, which is opposite to the first side. The auxiliary indicator light strip indicates the current communication status of the acquisition terminal 1, and the function indicator light strip indicates the power-on / off status of the acquisition terminal 1. It should be noted that in this configuration, maintenance personnel can see these two lights from a distance while standing on the ground away from the pole-mounted transformer. When they see that the current communication status indicated by the auxiliary indicator light strip is abnormal, they can take timely action to avoid wasting too much time during communication failures. Furthermore, the function indicator light strip shows whether the current power-on / off status is normal. If, after installation on the pole-mounted transformer, the indicator light shows that the terminal is already off, it can be removed as soon as possible for replacement or restart, thus resolving the problem quickly and avoiding excessive waiting time.

[0038] In another preferred embodiment of the above-mentioned live-line detection device for internal insulation defects of pole-mounted transformers, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the insulating rod of the live-line detection device for internal insulation defects of pole-mounted transformers provided by this utility model. The insulating rod 2 may include an epoxy glass resin rod body 22 with an adjustable length of 1.2 meters to 3.2 meters. This material is relatively light and strong. The length of the insulating rod 2 can be adjusted by rotating the thread to reach the height required to transport the acquisition terminal to the surface of the pole-mounted transformer and ensure a stable connection. The bottom part of the rod body 22 can be wrapped with insulating rubber. This soft material will not cause harm to maintenance personnel. The top part of this rod body can be fixed with a universal rod assembly 23, so that the orientation of the universal rod assembly 23 can be adjusted more conveniently according to actual needs. The other end of the universal rod assembly 23 is used to set the connecting part 21, and can use an aluminum alloy interface for greater strength. The overall weight of this insulating rod 2 can be no more than 2 kg, and the overall insulation level is no less than 10 kV.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A live-line detection device for internal insulation defects in a pole-mounted transformer, characterized in that, This includes data acquisition terminals, telescopic insulating rods, and intelligent analysis terminals; An acoustic sensor and an adsorption component for adsorbing onto the surface of the pole-mounted transformer are provided on the first side of the acquisition terminal. The acoustic sensor is used to acquire the acoustic partial discharge signal of the pole-mounted transformer. The top end of the insulating rod is provided with a connecting component for assembling and disassembling the data acquisition terminal; The intelligent analysis terminal is communicatively connected to the acquisition terminal and is used to analyze whether there are insulation defects inside the pole-mounted transformer based on the acoustic partial discharge signal transmitted by the acquisition terminal.

2. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The adsorption component is a permanent magnet component.

3. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The number of adsorption components is two, and the acoustic sensor is disposed between the two adsorption components.

4. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, An adsorption detection sensor is also provided next to the adsorption component, and an adsorption status indicator is also provided on the acquisition terminal. The adsorption detection sensor is communicatively connected to the adsorption status indicator to transmit adsorption status information to the adsorption status indicator, which is used to display the adsorption status.

5. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The data acquisition terminal is also provided with a fall arresting ring for attaching a rope on a second side perpendicular to the first side. The rope is arranged along the direction of the insulating rod. The insulating rod is also provided with a plurality of constraint rings for constraining the rope to the rod in sequence.

6. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, An auxiliary indicator light strip and a function indicator light are also provided on the third side of the acquisition terminal opposite to the first side. The auxiliary indicator light strip is used to indicate the current communication status of the acquisition terminal, and the function indicator light is used to indicate the power on / off status of the acquisition terminal.

7. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The number of data acquisition terminals is at least four.

8. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The connecting component at the top of the insulating rod is an electromagnet.

9. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The connecting component at the top of the insulating rod is a clamp with a snap fastener.

10. The live-line detection device for internal insulation defects of a pole-mounted transformer according to claim 1, characterized in that, The insulating rod includes an epoxy glass resin rod body with an adjustable length of 1.2 meters to 3.2 meters. The bottom end of the rod body is wrapped with insulating rubber, and a universal rod assembly is fixed to the top end of the rod body. The other end of the universal rod assembly is used to set the connecting component.

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