CN108225568A - High voltage side of transformer casing fault detection method - Google Patents

Abstract

The invention provides a method for detecting the fault of the bushing on the high-voltage side of the transformer, which includes: determining whether the bushing on the high-voltage side of the transformer is abnormal according to the display screen of the infrared thermal imager; if any bushing is abnormal, judging whether the abnormal bushing is There is a fault; if there is no fault, the background temperature of the abnormal bushing is detected; according to the background temperature, the ambient temperature parameters of the infrared thermal imaging camera are reset; through the reset infrared thermal imaging camera, the transformer Detect whether there is a fault in the bushing on the high-pressure side. The bushing fault detection method at the high-voltage side of the transformer provided by the invention can effectively prevent the influence of the ambient temperature on the detection of the transformer, prevent maintenance personnel from taking wrong handling measures, improve the maintenance efficiency, and reduce the maintenance cost.

Description

Fault Detection Method for Bushing at High Voltage Side of Transformer

technical field

The invention belongs to the technical field of transformers, and more specifically relates to a fault detection method for bushings on the high-voltage side of a transformer.

Background technique

Infrared temperature measurement technology has been widely used in live detection of power equipment, and it is also one of the routine live detection items of transformers. Infrared temperature measurement can successfully detect various heating defects of transformers, including dielectric loss and heat generation of high-voltage bushings, abnormal oil level in bushings, Poor contact of bushing joints, magnetic leakage and heating of the main body, etc.

In the prior art, infrared temperature measurement is often implemented by an infrared thermal imager. For the capacitive bushing on the high-voltage side, the detection of voltage-induced heating defects is easily disturbed by the environment. When there are obstacles near the transformer, the heat of the transformer body is easy to accumulate between the obstacles. When the infrared thermal imager measures the temperature, affected by the heat convection of the air, some bushings on the high-voltage side will obviously heat up, and the inspectors are likely to make misjudgments. Heating is caused by dielectric loss, and the voltage-type heating caused by dielectric loss is often a critical defect, which is easy to mislead maintenance personnel to make wrong treatment measures, wasting manpower and material resources.

Contents of the invention

In view of this, an embodiment of the present invention provides a method for detecting a fault of a bushing on the high voltage side of a transformer, which can solve the technical problem in the prior art that errors are prone to occur in the detection of the bushing on the high voltage side of a transformer.

An embodiment of the present invention provides a method for detecting a bushing fault on the high voltage side of a transformer, including:

According to the display screen of the infrared thermal imager, determine whether the bushing on the high voltage side of the transformer is abnormal;

If there is an abnormality in the bushing, it is judged whether there is a fault in the abnormal bushing;

If there is no fault, detecting the background temperature of the abnormal bushing;

According to the background temperature, reset the ambient temperature parameters of the infrared camera;

Through the reset infrared thermal imaging camera, it is detected whether there is a fault in the bushing on the high voltage side of the transformer.

Further, according to the display screen of the infrared thermal imager, it is determined whether the bushing on the high voltage side of the transformer is abnormal, including:

Determine the temperature of the three high-voltage side bushings of the transformer according to the display screen of the infrared thermal imager;

According to the temperature of the three high-voltage side bushings of the transformer, determine the high-voltage side bushing with the highest temperature;

If the difference between the temperature of the high-voltage side bushing with the highest temperature and the temperature of any other high-voltage side bushing is greater than a preset threshold, it is determined that the high-voltage side bushing with the highest temperature is abnormal.

Further, if there is an abnormality in the bushing, it is judged whether there is a fault in the abnormal bushing, including:

If there is an abnormality in the bushing, detect the temperature of the end screen grounding wire of the abnormal bushing;

If the temperature of the last screen grounding wire is higher than the ambient temperature, it is determined that the abnormal bushing has a fault.

Further, detecting the temperature of the end shield grounding wire of the abnormal bushing includes:

Placing the thermal imaging camera on the supporting tool so that the thermal imaging camera is flush with the end screen grounding line of the abnormal bushing;

moving the thermal imaging camera to a preset range of the abnormal bushing;

The temperature of the grounding wire of the last screen of the bushing where abnormality occurs is detected by the infrared thermal imager.

Further, if there is no fault, detecting the background temperature of the abnormal bushing includes:

If there is no fault, fix the temperature detection device on the insulating rod;

The temperature detection device is sent to the middle of the abnormal bushing through the insulating rod, and the background temperature of the abnormal bushing is detected by the temperature detection device.

Further, by resetting the infrared thermal imager, it is detected whether there is a fault in the bushing on the high voltage side of the transformer, including:

Obtain the temperature of the bushing on the high-voltage side of the transformer through the reset infrared thermal imager;

Judging whether the difference between the temperature of the abnormal bushing and the temperature of any other high-voltage side bushing is greater than a preset threshold;

If yes, it is determined that the abnormal high-voltage bushing has a fault.

Further, if there is an abnormality in the bushing, it is judged whether there is a fault in the abnormal bushing, including:

If there is an abnormality in the casing, it is judged whether the reason for the abnormality in the casing is an external environmental factor;

If the cause of the abnormality of the bushing is not an external environmental factor, it is determined that the abnormal bushing has a fault.

Further, it is judged whether the cause of abnormality of the bushing is an external environmental factor, including:

Detecting the distance between the abnormal bushing and the nearest obstacle;

judging whether the distance between the abnormal bushing and the nearest obstacle is greater than a distance threshold;

If the distance between the abnormal bushing and the nearest obstacle is greater than the distance threshold, it is determined that the reason for the abnormal bushing is not an external environmental factor.

Further, before judging whether the distance between the abnormal bushing and the nearest obstacle is greater than a distance threshold, the method further includes:

If the abnormal bushing is a C-phase high-voltage bushing, the distance threshold is determined according to the distance between the A-phase high-voltage bushing in the transformer and the closest obstacle to the A-phase high-voltage bushing.

Further, the bushing fault detection method on the high voltage side of the transformer also includes:

If there is a fault in the abnormal bushing, the abnormal bushing is overhauled.

The beneficial effect of the fault detection method for the transformer high-voltage side bushing provided by the embodiment of the present invention is that: compared with the prior art, the fault detection method for the high-voltage side bushing of the transformer provided by the embodiment of the present invention, through the display screen of the infrared thermal imager , determine whether the bushing on the high voltage side of the transformer is abnormal. If there is an abnormality in the bushing, judge whether there is a fault in the abnormal bushing. According to the background temperature, reset the ambient temperature parameters of the thermal imager, and detect whether there is a fault in the high-voltage side bushing of the transformer through the reset thermal imager, which can effectively prevent the impact of the ambient temperature on the detection of the transformer and avoid maintenance. Personnel make wrong handling measures, which improves the maintenance efficiency and reduces the maintenance cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

FIG. 1 is a flow chart of a method for detecting a bushing fault on the high voltage side of a transformer provided by Embodiment 1 of the present invention;

FIG. 2 is a flow chart of a method for detecting a bushing fault on the high voltage side of a transformer provided in Embodiment 2 of the present invention;

Fig. 3 is a schematic diagram of the position of the transformer in the high voltage side bushing fault detection method provided by Embodiment 3 of the present invention.

Reference signs:

1- Transformer 2- Distribution building 3- Partition wall

11-A phase high voltage bushing 12-B phase high voltage bushing 13-C phase high voltage bushing

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

Embodiment one

Embodiment 1 of the present invention provides a method for detecting a bushing fault on a high voltage side of a transformer. FIG. 1 is a flow chart of a method for detecting a bushing fault on a high voltage side of a transformer provided by Embodiment 1 of the present invention. As shown in Figure 1, the method in this embodiment may include:

Step 101, according to the display screen of the infrared thermal imaging camera, determine whether the bushing on the high voltage side of the transformer is abnormal.

In this embodiment, a FLIR-P65 thermal imaging camera can be used to detect the transformer. The high-voltage side bushing of the transformer may include: A-phase high-voltage bushing, B-phase high-voltage bushing and C-direction high-voltage bushing. The infrared spectrum of each part of the transformer can be displayed by the infrared thermal imager, and the temperature of each part can be determined according to the infrared spectrum.

Preferably, in this step, according to the display screen of the infrared thermal imager, determining whether the bushing on the high voltage side of the transformer is abnormal may include:

Determine the temperature of the three high-voltage side bushings of the transformer according to the display screen of the infrared thermal imager; determine the high-voltage side bushing with the highest temperature according to the temperatures of the three high-voltage side bushings of the transformer; if the highest temperature If the difference between the temperature of the high-voltage side bushing and the temperature of any other high-voltage side bushing is greater than a preset threshold, it is determined that the high-voltage side bushing with the highest temperature is abnormal.

The preset threshold can be set according to the actual situation. Generally, the temperature error between the three high-voltage side bushings of the transformer should not exceed 1.5K. Therefore, the preset threshold can be set to 1.5K.

For example, according to the display screen of the infrared thermal imaging camera, the temperatures of the three high-voltage side bushings of the transformer are: A-phase high-voltage bushing 28°C, B-phase high-voltage bushing 28.1°C, and C-phase high-voltage bushing 35°C. According to these three temperatures, it can be determined that the bushing with the highest temperature among the three high-voltage side bushings of the transformer is the C-phase high-voltage bushing. The temperature difference between the C-phase high-voltage bushing and the A-phase high-voltage bushing, and the temperature difference between the C-phase high-voltage bushing and the B-phase high-voltage bushing are all greater than a preset threshold, and it can be determined that the phase C high-voltage bushing is abnormal.

Step 102, if any bushing is abnormal, it is judged whether the abnormal bushing has a fault.

Abnormal bushings may be caused by internal faults that lead to abnormal temperature, or may be caused by environmental reasons. Therefore, in this embodiment, it is necessary to judge whether there is a fault in the abnormal bushing.

Preferably, in this step, if there is an abnormality in the bushing, it is judged whether there is a fault in the abnormal bushing, which may include:

If there is an abnormality in the bushing, the temperature of the last screen grounding wire of the abnormal bushing is detected; if the temperature of the last screen grounding wire is greater than the external environment temperature, it is determined that the abnormal bushing has a fault.

The last screen grounding wire is located under the bushing on the high-voltage side. If the temperature of the last screen grounding wire is too high, it can be considered that the bushing is faulty. The infrared thermal imaging camera needs to be in a relatively far place when testing the transformer, otherwise the inspector may be in danger of electric shock, but the size of the grounding wire of the last screen is small, and the grounding of the last screen cannot be seen when testing in a relatively far place The specific temperature of the line.

In this embodiment, the detection of the ground wire of the last screen can be realized by means of a supporting tool. Specifically, detecting the temperature of the end screen grounding wire of the abnormal bushing may include:

Place the thermal imaging camera on the supporting tool so that the thermal imaging camera is flush with the grounding line of the last screen of the abnormal bushing; move the thermal imaging camera to the abnormal bushing within the preset range; the temperature of the grounding wire of the last screen of the bushing where abnormality occurs is detected by the infrared thermal imager.

Wherein, the thermal imaging camera is flush with the grounding line of the last screen of the abnormal bushing, which may mean that the center of the thermal imaging camera is at the same level as the center of the grounding line of the last screen. The preset range can be the range where the infrared imager can detect the temperature spectrum of the last screen grounding wire. For example, the infrared imager must be within 0.5 meters of the casing to detect the last screen grounding wire. The preset range can be 0.5 Meter.

Preferably, the support device can be a ladder, and the infrared thermal imaging camera is placed on the ladder, and then the ladder is pushed to the vicinity of the abnormal casing, and the abnormal casing is detected by the infrared thermal imager The temperature of the ground wire at the end of the screen.

Whether the temperature of the grounding wire of the last screen is higher than the temperature of the external environment can be seen directly from the display image of the infrared thermal imager. If the display brightness of the grounding wire of the last screen is greater than the display brightness around the bushing, it means that the grounding of the last screen is The temperature of the wire is higher than the ambient temperature, and if the display brightness of the last screen ground wire is lower than the display brightness around the bushing, it means that the temperature of the last screen ground wire is lower than the external ambient temperature.

If the temperature of the last screen grounding wire is greater than the external ambient temperature, it means that the abnormal bushing has a fault; if the temperature of the last screen grounding wire is less than or equal to the external ambient temperature, it means that the abnormal bushing The tube is not faulty.

Step 103, if there is no fault, detect the background temperature of the abnormal bushing.

The background temperature of the bushing is also the ambient temperature corresponding to the bushing.

Preferably, if there is no fault in this step, detecting the background temperature of the abnormal bushing may include:

If there is no fault, fix the temperature detection device on the insulating rod; send the temperature detection device to the middle of the abnormal bushing through the insulating rod, and detect the abnormal bushing through the temperature detection device background temperature.

Wherein, the temperature detection device may be a thermometer, and the middle part refers to the part between the upper third and the lower third of the casing. Send the temperature detection device to the middle of the abnormal bushing, but do not contact the bushing, keep a certain distance such as 0.1 meters from the bushing, and directly detect the temperature near the middle of the bushing as the bushing background temperature.

Step 104, according to the background temperature, reset the ambient temperature parameters of the infrared camera.

Specifically, the ambient temperature corresponding to the abnormal bushing in the infrared thermal imaging camera may be set as the background temperature detected in step 103 . There is no need to reset the ambient temperature corresponding to the bushing that is not abnormal.

Step 105 , using the reset thermal imaging camera, to detect whether there is a fault in the bushing at the high voltage side of the transformer.

After resetting the thermal imaging camera, it is possible to detect whether there is a fault in the bushing on the high-voltage side of the transformer again. Since the ambient temperature parameters of the thermal imaging camera have been corrected, it can be detected directly through the display screen of the thermal imaging camera in the future. Determine if there is a fault with the high pressure side bushing.

Preferably, in this step, by resetting the infrared thermal imager, detecting whether there is a fault in the bushing on the high voltage side of the transformer may include:

Obtain the temperature of the high-voltage side bushing of the transformer through the reset infrared thermal imager; determine whether the difference between the temperature of the abnormal bushing and the temperature of any other high-voltage side bushing is greater than a preset threshold; If yes, it is determined that the abnormal high-voltage bushing has a fault.

Specifically, if the adjusted infrared thermal imaging camera detects that the temperature of the previously abnormal bushing is still much higher than the temperature of other high-voltage side bushings, it indicates that the bushing is faulty.

In practical applications, users can detect transformers with infrared thermal imaging cameras. During the first or previous inspections, there may be abnormalities in a certain high-voltage side bushing of the transformer. At this time, this implementation can The method provided in the example is to judge whether there is a fault in the bushing, and to reset the ambient temperature of the bushing when there is no fault, and to detect the transformer according to the reset infrared thermal imager in the future .

The method for detecting the fault of the bushing on the high voltage side of the transformer provided in this embodiment determines whether there is an abnormality in the bushing on the high voltage side of the transformer according to the display screen of the infrared thermal imager. Fault, if there is no fault, then detect the background temperature of the abnormal bushing, and reset the ambient temperature parameters of the thermal imaging camera according to the background temperature, through the reset thermal imaging camera, the transformer Detecting whether there is a fault in the bushing on the high-voltage side can effectively prevent the influence of the ambient temperature on the detection of the transformer, prevent the maintenance personnel from making wrong handling measures, improve the maintenance efficiency, and reduce the maintenance cost.

Embodiment two

Embodiment 2 of the present invention provides a method for detecting a bushing fault on a high voltage side of a transformer. The method for detecting the fault of the bushing on the high voltage side of the transformer provided in this embodiment is based on the technical solution provided in the first embodiment, and checks the external environment to determine whether there is a fault in the abnormal high voltage side bushing.

Fig. 2 is a flow chart of a method for detecting a bushing fault on the high voltage side of a transformer provided by Embodiment 2 of the present invention. As shown in Figure 2, the method in this embodiment may include:

Step 201, according to the display screen of the infrared thermal imaging camera, determine whether the bushing on the high voltage side of the transformer is abnormal.

In this embodiment, the specific implementation principle of step 201 is similar to that of step 101 in the first embodiment, and will not be repeated here.

Step 202, if there is an abnormality in the bushing, it is judged whether the cause of the abnormality in the bushing is an external environmental factor.

Step 203, if the cause of the abnormality of the bushing is not an external environmental factor, then determine that the abnormal bushing has a fault.

Step 204, if there is a fault in the abnormal bushing, overhaul the abnormal bushing.

Wherein, in step 202, judging whether the cause of the casing abnormality is an external environmental factor may include:

Detecting the distance between the abnormal bushing and the nearest obstacle to the abnormal bushing; judging whether the distance between the abnormal bushing and the nearest obstacle is greater than a distance threshold; if the If the distance between the abnormal bushing and the nearest obstacle is greater than the distance threshold, it is determined that the abnormality of the bushing is not caused by external environmental factors.

The distance threshold can be set according to actual needs. For example, it can be 5 meters. When the distance between the surrounding obstacles and the bushing is less than the distance threshold, the temperature between the obstacle and the bushing may be too high. Affect the accuracy of infrared detection.

Preferably, if the abnormal bushing is a C-phase high-voltage bushing, the distance between the A-phase high-voltage bushing in the transformer and the nearest obstacle to the A-phase high-voltage bushing can be used to determine the The above distance threshold.

Wherein, the distance threshold may be the distance between the phase A high voltage bushing and the closest obstacle to the phase A high voltage bushing.

The obstacle can be a wall, etc., for example, the phase A high voltage bushing is 5 meters away from the surrounding walls, then the distance threshold can be 5 meters, if the distance between the phase C high voltage bushing and the surrounding walls is greater than 5 meters, Then it can be determined that the reason for the abnormality of the C-phase high-voltage bushing is not the external environmental factors.

If the cause of the abnormality of the bushing is not an external environmental factor, it is determined that the abnormal bushing has a fault, and after it is determined that the abnormal bushing has a fault, the abnormal bushing can be overhauled .

Further, if there is no fault in the abnormal bushing, the background temperature of the abnormal bushing is detected; according to the background temperature, the ambient temperature parameters of the infrared thermal imaging camera are reset; The imager is used to detect whether there is a fault in the bushing on the high voltage side of the transformer. For the specific processing manner when there is no fault, refer to Embodiment 1, which will not be repeated here.

The method for detecting a bushing fault on the high-voltage side of a transformer provided in this embodiment, when a bushing is abnormal, determines whether the abnormal bushing is faulty by judging whether the cause of the abnormal bushing is an external environmental factor, and can It is convenient and intuitive to judge whether there is a fault in the bushing, and the processing efficiency is improved.

On the basis of the technical solutions provided by the above embodiments, preferably, besides correcting the temperature, the humidity can also be corrected. The detection of humidity can be realized by a humidity detection device such as a hygrometer. The detection and correction method of humidity is similar to that of temperature, and will not be repeated here.

Embodiment Three

Embodiment 3 of the present invention provides a method for detecting a bushing fault on a high voltage side of a transformer. Embodiment 3 of the present invention provides a specific application example based on the solutions provided by the foregoing embodiments.

When using an infrared thermal imager to inspect a 220KV transformer, it was found that the C-phase of the bushing on the high-voltage side was heated as a whole. The side load current is 230A. It can be seen from the infrared thermal imager that the temperature of the C-phase high-voltage bushing of the transformer is much higher than that of the A-phase high-voltage bushing and the B-phase high-voltage bushing.

According to the preliminary analysis of the characteristics of the infrared spectrum, the reason for the heating of the C-phase high-voltage bushing is suspected to be the increase of the dielectric loss caused by the deterioration of the internal insulation, which belongs to the voltage-induced heating type defect. According to the application specification for infrared diagnosis of live equipment, voltage-induced heating should be defined as a serious defect or above. Since the phase C high-voltage bushing is compared with the A-phase high-voltage bushing, the temperature difference reaches 1.8K, and it is misjudged that the bushing has a serious defect.

However, the inspectors combined the actual situation at the site and conducted inspections from multiple angles, inferring that the heating bushing was not a defect, but because the hot air emitted by the transformer gathered inside the isolation wall, resulting in the air near the C-phase high-voltage bushing on the high-voltage side The temperature rises sharply, causing the bushing to heat up.

In actual situations, when the equipment load, radiation rate, and wind speed are determined, the external factors that affect infrared temperature measurement mainly include ambient temperature, relative humidity, distance, etc. Among them, the ambient temperature has the greatest impact on the detection results, and the ambient temperature is used as the infrared thermal image. The important parameters of the instrument should be set correctly before the test.

According to the detection principle of the infrared thermal imaging camera, the internal temperature of the instrument will be compensated. If the surface temperature of the device under test is T ₁ (absolute temperature), and the external ambient temperature is T ₂ (absolute temperature), the object within a unit area The emitted radiant energy is The absorbed radiation energy is Then it can be concluded that the net radiant energy Q of the object is: (1)

In formula (1): A is the unit area of the measured object; σ is the Stefan-Boltzmann constant; ε and α are the emissivity and absorptivity of the measured object, respectively.

In general, the ability of an object to receive external radiation is equal to the ability of the object to radiate its own energy, that is, the ε and α of the device are equal, then:

According to the above analysis, it can be obtained that as the external environment temperature _T2 changes, the measurement results will also change accordingly. When the ambient temperature parameter setting value in the infrared thermal imager is lower than the actual temperature, the detection result is higher than the actual value on site.

Fig. 3 is a schematic diagram of the position of the transformer in the high voltage side bushing fault detection method provided by Embodiment 3 of the present invention. As shown in Figure 3, the transformer 1 includes a phase A high-voltage bushing 11, a B-phase high-voltage bushing 12, and a C-phase high-voltage bushing 13. The transformer 1 is located in the power distribution building 2 and the isolation wall 3, and the power distribution building 2 and the isolation wall 3 are higher than the bushing of transformer 1.

Combined with the actual situation on site, the distance L1 between the phase A high voltage bushing 11 and the left partition wall 3 is 6 meters, and the distance L2 between the phase C high voltage bushing 13 and the right partition wall 3 is 3.5 meters. Since the high-voltage bushing 11 of phase A is far away from the separation wall 3, the infrared temperature measurement is not affected by the hot air flow, so there is no heating phenomenon on the surface of the high-voltage bushing 11 of phase A. The C-phase high-voltage bushing 13 is closer to the right partition wall 3 , and a large amount of hot air generated by the transformer 1 accumulates inside the partition wall 3 when the transformer 1 is in operation.

The inspectors used a thermo-hygrometer to measure near the middle of the phase C high-voltage bushing 13. The ambient temperature of this part reached 40°C and the relative humidity was 18%. The bushing is coated with RTV anti-fouling flashover paint, which has a relatively high absorptivity and emissivity of about 0.92. When the hot air flow rises along the C-phase high-voltage bushing 13, the bushing surface will also absorb a large amount of heat.

According to the temperature compensation principle of the infrared thermal imager, the internal parameters of the infrared thermal imager are reset as follows: the ambient temperature of the C-phase high voltage bushing 13 is 40° C., the humidity is 18%, and the emissivity is 0.92. Then retest the transformer 1, and it can be seen from the retaken image that the temperature of the C-phase high-voltage bushing 13 is 0.1°C different from the temperature of the A-phase high-voltage bushing 11, and the equipment is judged to be normal.

At present, isolation walls 3 are often installed on both sides of transformer 1 in new substations. According to the statistics of on-site inspection cases, in the process of infrared temperature measurement, the phenomenon of overall heating of the main transformer bushing due to the interference of hot air in the isolation wall 3 is common. The casing temperature of the partition wall 3 is often 2-4°C higher than that of the outer casing, which is likely to cause misjudgment by the testing personnel. Such phenomena should be taken seriously. The method provided in this embodiment can achieve the purpose of eliminating interference by measuring the temperature near the isolation wall 3 corresponding to the transformer 1 and adjusting the internal parameters of the infrared thermal imaging camera.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. A transformer high-voltage side bushing fault detection method, characterized in that, comprising: According to the display screen of the infrared thermal imager, determine whether the bushing on the high voltage side of the transformer is abnormal; If there is an abnormality in the bushing, it is judged whether there is a fault in the abnormal bushing; If there is no fault, detecting the background temperature of the abnormal bushing; According to the background temperature, reset the ambient temperature parameters of the infrared camera; Through the reset infrared thermal imaging camera, it is detected whether there is a fault in the bushing on the high voltage side of the transformer. 2. The method for detecting faults in the bushing at the high voltage side of the transformer according to claim 1, wherein, according to the display screen of the thermal imaging camera, determining whether the bushing at the high voltage side of the transformer is abnormal includes: Determine the temperature of the three high-voltage side bushings of the transformer according to the display screen of the infrared thermal imager; According to the temperature of the three high-voltage side bushings of the transformer, determine the high-voltage side bushing with the highest temperature; If the difference between the temperature of the high-voltage side bushing with the highest temperature and the temperature of any other high-voltage side bushing is greater than a preset threshold, it is determined that the high-voltage side bushing with the highest temperature is abnormal. 3. The method for detecting faults of bushings on the high-voltage side of a transformer as claimed in claim 1, wherein if any abnormality occurs in a bushing, it is judged whether there is a fault in the abnormal bushing, including: If there is an abnormality in the bushing, detect the temperature of the end screen grounding wire of the abnormal bushing; If the temperature of the last screen grounding wire is higher than the ambient temperature, it is determined that the abnormal bushing has a fault. 4. The transformer high-voltage side bushing fault detection method as claimed in claim 3, characterized in that, detecting the temperature of the last screen grounding wire of the abnormal bushing includes: Placing the thermal imaging camera on the supporting tool so that the thermal imaging camera is flush with the end screen grounding line of the abnormal bushing; moving the thermal imaging camera to a preset range of the abnormal bushing; The temperature of the grounding wire of the last screen of the bushing where abnormality occurs is detected by the infrared thermal imager. 5. The transformer high-voltage side bushing fault detection method as claimed in claim 1, wherein if there is no fault, then detecting the background temperature of the abnormal bushing includes: If there is no fault, fix the temperature detection device on the insulating rod; The temperature detection device is sent to the middle of the abnormal bushing through the insulating rod, and the background temperature of the abnormal bushing is detected by the temperature detection device. 6. The method for detecting faults in the bushings on the high voltage side of the transformer as claimed in claim 1, wherein the detection of whether there is a fault in the bushings on the high voltage side of the transformer is carried out by resetting the thermal imaging camera, including: Obtain the temperature of the bushing on the high-voltage side of the transformer through the reset infrared thermal imager; Judging whether the difference between the temperature of the abnormal bushing and the temperature of any other high-voltage side bushing is greater than a preset threshold; If yes, it is determined that the abnormal high-voltage bushing has a fault. 7. The method for detecting faults of bushings on the high-voltage side of a transformer according to claim 1, wherein if any bushing is abnormal, it is judged whether there is a fault in the abnormal bushing, including: If there is an abnormality in the casing, it is judged whether the reason for the abnormality in the casing is an external environmental factor; If the cause of the abnormality of the bushing is not an external environmental factor, it is determined that the abnormal bushing has a fault. 8. The method for detecting faults of bushings on the high-voltage side of transformers as claimed in claim 7, wherein judging whether the cause of abnormalities in the bushings is an external environmental factor comprises: Detecting the distance between the abnormal bushing and the nearest obstacle; Judging whether the distance between the abnormal bushing and the nearest obstacle is greater than a distance threshold; If the distance between the abnormal bushing and the nearest obstacle is greater than the distance threshold, it is determined that the reason for the abnormal bushing is not an external environmental factor. 9. The transformer high-voltage side bushing fault detection method as claimed in claim 8, characterized in that, before judging whether the distance between the abnormal bushing and the nearest obstacle is greater than a distance threshold, it also includes: If the abnormal bushing is a C-phase high-voltage bushing, the distance threshold is determined according to the distance between the A-phase high-voltage bushing in the transformer and the closest obstacle to the A-phase high-voltage bushing. 10. The transformer high voltage side bushing fault detection method according to claim 8, further comprising: If there is a fault in the abnormal bushing, the abnormal bushing is overhauled.