Transformer operation monitoring method and system, outgoing line ascending flanged base structure and transformer

Abstract

The invention discloses a transformer operation monitoring method, the method is used for transformer operation, the method comprises a detection step and a judgment step, the detection step comprises: obtaining a sample at the top in an outgoing line ascending flanged base structure; detecting the obtained sample to obtain a detection result; and the judgment step comprises the steps of judging the operation state of the transformer according to the detection result, and generating a fault alarm when the operation state of the transformer is abnormal. The method is reasonable in step setting, the intrinsic reliability of the transformer is effectively improved, safety accidents can be avoided, the safety of personnel and facilities is guaranteed, and economic losses and social influences are reduced. The invention further provides a transformer operation monitoring system, a transformer outgoing line ascending flanged base structure and a transformer.

Description

Technical Field

[0001] The present invention specifically relates to a transformer operation monitoring method and system, an outlet line raising seat structure and a transformer. Background Art

[0002] As an important device for electric energy transmission in the power system, power transformers are indispensable core equipment of the power system, especially large oil-immersed transformers in ultra-high voltage power grids, which carry a wide range of power transmission and transformation tasks. Their safe and reliable operation is very important.

[0003] The working voltage of ultra-high voltage power transformers is relatively high, and in order to solve the problem of internal and external electrical insulation distance, an indirect outlet structure is often used, using an L-shaped outlet box (hereinafter referred to as the outlet box) connected to the oil tank and an insulating molded outlet device to connect the internal coil to the external power grid through a high-voltage bushing. Since the outlet box is connected to the inside of the oil tank, when the insulating material therein deteriorates due to electrical, thermal, mechanical and other factors, the performance of the insulating material may be reduced and then broken down, resulting in arc discharge. Arc discharge causes oil cracking and gasification, while increasing the temperature and volume expansion in the outlet box, thereby increasing the internal pressure of the transformer. When the pressure increase level exceeds the maximum mechanical strength that the equipment can withstand, it will cause major safety accidents such as cracking, explosion or "emission" of the transformer bushing, directly affecting the operation of the power system and seriously threatening the safety of surrounding building equipment and personnel. Summary of the invention

[0004] The inventors of the present invention have found that due to the requirements of the standard content, the main measures currently taken to deal with the above-mentioned cracking and other accidents are mostly to set explosion-proof measures at the transformer oil tank body or at the connection between the oil tank and the outlet box. The main purpose is to avoid contamination of the insulating oil inside the oil tank due to the principle of the communicating vessel. However, such explosion-proof measures are mostly instantaneous solutions to accidents and do not provide preventive measures for the above-mentioned accidents.

[0005] However, the inventor found that, since the L-shaped outlet box body is relatively large and is basically the same height as the oil tank, the connection relationship between the two is based on the principle of communicating vessels, so that the internal pressure of the outlet box cannot be directly released in time through the pressure release device set in the transformer oil tank; the outlet structure of the product using the indirect outlet method for power transformers is basically a conventional outlet riser structure, and the outlet insulation molding inside the outlet box is difficult to be effectively vented and immersed in oil during the installation stage, and the establishment process of its insulation system is relatively long and cannot be guaranteed. Therefore, based on this situation, once the gas is generated, it will accumulate at the top of the outlet box, that is, this is the origin area of ​​the operation failure, and the current conventional measures and standard contents have ignored this fault origin area, and most of them focus on the protection of the oil tank body, which buries hidden dangers for the safe operation of the transformer in the later stage. During the operation of the transformer, it is impossible to monitor the insulating oil index and gas production in the outlet box in time, and the fault problem cannot be discovered in time. When an internal fault occurs, it is impossible to complete the pressure release in time and make the transformer out of operation through the protection device, which eventually causes the fault to become an accident.

[0006] Accordingly, the technical problem to be solved by the present invention is to provide a transformer operation monitoring method for the above-mentioned deficiencies in the prior art. The method steps are reasonably arranged, effectively improve the intrinsic reliability of the transformer, avoid safety accidents, ensure the safety of personnel and facilities, and reduce economic losses and social impacts. The present invention also provides a transformer operation monitoring system, a transformer outlet riser structure, and a transformer.

[0007] The present invention provides a transformer operation monitoring method, which is used when the transformer is in operation. The method includes a detection step and a judgment step. The detection step includes:

[0008] Obtain samples from the top of the outlet riser structure;

[0009] Testing the obtained sample to obtain a test result;

[0010] The judging step comprises:

[0011] The transformer operating status is determined based on the detection results, and a fault alarm is generated when the transformer operating status is abnormal.

[0012] Furthermore, the obtaining of samples from the top of the cable lift structure specifically includes: obtaining an oil sample of insulating oil from the top of the cable lift structure, and / or obtaining a gas sample from the top of the cable lift structure.

[0013] Furthermore, the transformer operation monitoring method also includes an execution step, which includes: detecting the air pressure inside the outgoing line lifting seat structure, and performing pressure release on the outgoing line lifting seat structure when the air pressure exceeds a set value.

[0014] The present invention also provides a transformer operation monitoring system, which is used when the transformer is running. The system includes: a sampling device, which is arranged at the elevated seat of the transformer outlet elevated seat structure, and is used to obtain samples from the top of the outlet elevated seat structure when the transformer is running; a detection device, which is used to detect the samples obtained by the sampling device to obtain detection results; a control unit, which is electrically connected to the detection device, and is used to judge the operating status of the transformer according to the detection results, and generate a fault alarm when the operating status of the transformer is abnormal.

[0015] Furthermore, the sampling device includes an oil sampling device and / or a gas sampling device. The oil sampling device is arranged on the top of the lifting seat to obtain an oil sample of the top insulating oil in the transformer outlet lifting seat structure; the gas sampling device is arranged on the top of the lifting seat to obtain a gas sample of the top gas in the transformer outlet lifting seat structure.

[0016] Furthermore, the transformer operation monitoring system also includes a pressure release device, which is arranged at the lifting seat and is used to detect the air pressure inside the transformer outlet lifting seat structure, and perform pressure release on the transformer outlet lifting seat structure when the air pressure exceeds a set value.

[0017] The present invention also provides a transformer outlet elevated seat structure, including an outlet box, an elevated seat and the above-mentioned transformer operation monitoring system, wherein the bottom end of the outlet box is connected to the transformer oil tank, and the top end is connected to the elevated seat, and the transformer operation monitoring system is connected to the elevated seat.

[0018] Furthermore, the transformer outlet lifting seat structure also includes a vacuum pumping device for vacuuming the transformer outlet lifting seat structure. A valve interface is provided on the lifting seat, and the valve interface is connected to the vacuum pumping device during the transformer oil filling stage and connected to the pressure release device during the transformer operation stage.

[0019] Furthermore, the terminal box is an L-shaped cylindrical structure, the horizontal section is connected to the transformer oil tank, the vertical section is connected to the elevation seat, and an insulating molded wire outlet device coaxial with the terminal box is provided inside the terminal box. The high-voltage bushing of the transformer is inserted into the elevation seat and the terminal box in sequence. The bottom end of the insulating molded wire outlet device extends into the oil tank, and the top end is connected to the high-voltage bushing, so that the lead wire led out from the transformer body can be connected to the high-voltage bushing through the insulating molded wire outlet device.

[0020] Furthermore, the inner diameter of the raising seat is smaller than or equal to the inner diameter of the outlet box.

[0021] Furthermore, a flange is provided inside the outlet box, the top end of the insulating molded outlet device is fixedly connected to the flange, and an operation hole is opened on the side wall of the outlet box. There are two operation holes, which are respectively located on the upper and lower sides of the flange.

[0022] Furthermore, the transformer outlet lifting seat structure also includes an upper bracket and a lower bracket, wherein the lower bracket is supported and connected between the horizontal section of the outlet box and the transformer oil tank installation plane; and the upper bracket is tied and connected between the vertical section of the outlet box and the transformer oil tank.

[0023] The present invention also provides a transformer, comprising a transformer oil tank, a transformer body, a high-voltage bushing and the above-mentioned transformer outlet line elevation seat structure, wherein the transformer outlet line elevation seat structure is connected to the transformer oil tank, the high-voltage bushing is inserted into the transformer outlet line elevation seat structure, the transformer body is accommodated in the transformer oil tank, and the lead wires led out from the transformer body are connected to the high-voltage bushing through the transformer outlet line elevation seat structure.

[0024] Furthermore, the transformer also includes an oil filter for filtering insulating oil. The transformer oil tank is provided with an oil filling and draining valve, which is connected to the oil filter during the transformer oil filling stage, thereby cooperating with the vacuum pumping device to achieve full exhaust and oil immersion inside the terminal box.

[0025] The transformer operation monitoring method of the present invention obtains samples from the top of the outlet riser structure during the operation of the transformer, and judges whether the transformer operation state is normal based on the detection results of the samples.

[0026] Abnormal conditions caused by the cracking and gasification of insulating oil will first accumulate on the top of the outlet riser structure, resulting in abnormal insulating oil or gas components in this area. In the monitoring process of the present invention, the initial sampling is carried out at the top of the outlet riser structure. Therefore, the sample can represent the overall level of the fault origin area, and can also reflect the fault situation through the detection results at the first time of the fault. In the past, the detection means located inside the oil tank often obtained samples that have been further diluted, which has poor timeliness and poor accuracy in the feedback of the components, which can easily lead to neglect and eventually cause accidents.

[0027] In comparison, this method has better timeliness and accuracy in judging the operating status of the transformer. And precisely because it can discover the fault as soon as it occurs, it can be solved immediately after discovery to avoid hidden dangers. It has good accident prevention capabilities, essentially improving the operating reliability of the transformer, ensuring the safety of personnel and facilities, and effectively reducing economic losses and social impacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the internal structure of the transformer outlet lifting seat structure in embodiment 3 of the present invention;

[0029] Figure 2 1. It is a front view of the transformer outlet lifting seat structure in Embodiment 3 of the present invention;

[0030] Figure 3 is a top view of the transformer outlet wire raising seat structure in embodiment 3 of the present invention;

[0031] Figure 4 It is a schematic diagram of the connection structure of the transformer in Example 3 of the present invention.

[0032] In the figure: 1. outlet box; 11. insulation molding outlet device; 12. flange; 13. operation hole; 2. riser; 21. oil sampling device; 22. gas sampling device; 23. pressure release device; 24. vacuum device; 25. valve interface; 3. transformer oil tank; 31. oil filter; 32. oil filling and draining valve; 4. transformer body; 41. lead wire; 5. high-voltage bushing; 6. upper bracket; 7. lower bracket. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0035] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] Example 1

[0038] The transformer operation monitoring method of this embodiment is used when the transformer is in operation, and the system in Embodiment 2 can be used. The method includes a detection step and a judgment step. The detection step includes:

[0039] Obtain samples from the top of the outlet riser structure;

[0040] Testing the acquired samples to obtain test results;

[0041] The judgment steps include:

[0042] The transformer operating status is determined based on the detection results, and a fault alarm is generated when the transformer operating status is abnormal.

[0043] When the transformer is running, abnormal conditions caused by the cracking and gasification of the insulating oil will first accumulate on the top of the outlet riser structure, resulting in abnormal insulating oil or gas composition in this area. In the monitoring process of this embodiment, the initial sampling is carried out at the top of the outlet riser structure. Therefore, the sample can represent the overall level of the fault origin area, and can also reflect the fault situation through the detection results at the first time of the fault. In the past, the detection means located inside the oil tank often obtained samples that have been further diluted, which has poor timeliness and poor accuracy of the feedback of the components, which is easy to lead to neglect and eventually cause accidents.

[0044] In comparison, this method has better timeliness and accuracy in judging the operating status of the transformer. And precisely because it can discover the fault as soon as it occurs, it can be solved immediately after discovery to avoid hidden dangers. It has good accident prevention capabilities, essentially improving the operating reliability of the transformer, ensuring the safety of personnel and facilities, and effectively reducing economic losses and social impacts.

[0045] In this embodiment, obtaining samples from the top of the outlet lift seat structure specifically includes: obtaining an oil sample of insulating oil from the top of the outlet lift seat structure and obtaining a gas sample from the top of the outlet lift seat structure.

[0046] That is, the present embodiment obtains both oil samples and gas samples, and therefore the obtained samples are tested to obtain test results, specifically including: performing oil index test on the obtained oil sample to obtain oil sample test results; performing gas analysis test on the obtained gas sample to obtain gas sample test results, wherein the oil index test and the gas analysis test can specifically adopt test methods such as oil sample electrical, physical and chemical property test and gas content analysis, and the specific test method can be appropriately selected according to specific conditions such as different transformers and different operating conditions.

[0047] Judging the transformer operating status based on the test results specifically includes: when any one of the oil sample test results and the gas sample test results does not meet the set requirements, the transformer operating status is judged to be abnormal. This set requirement can be set manually according to the specific operating conditions, and can be abnormal (oil sample, gas sample) components, the content of one or several items exceeds the preset range, etc.

[0048] In this embodiment, the transformer operation monitoring method also includes an execution step, and the execution step includes: detecting the air pressure inside the outlet lift seat structure, and performing pressure release on the outlet lift seat structure when the air pressure exceeds the set value. It can be seen that the transformer operation monitoring method of this embodiment can not only propose effective detection means and alarm prevention methods when a fault occurs, but also provide effective protection means before the accumulation of faults leads to an accident. By setting the execution step to release the pressure on the outlet lift seat structure, this pressure release can directly remove the excessive pressure inside the outlet lift seat structure, so that the air pressure will not accumulate to a certain extent due to the principle of the communicating vessel before it can be removed through the pressure relief means on the oil tank side, avoiding accidents such as product explosion and fire caused by the increase in pressure, that is, avoiding more serious accidents, further reducing economic losses, and improving the reliability of transformer operation.

[0049] Example 2

[0050] The transformer operation monitoring system of this embodiment is used for transformer operation and can be used for the monitoring method in Embodiment 1. The system includes:

[0051] A sampling device, arranged at the elevated seat 2 of the transformer outlet elevated seat structure, used to obtain samples from the top of the outlet elevated seat structure when the transformer is running;

[0052] A detection device, used to detect the sample obtained by the sampling device and obtain a detection result;

[0053] The control unit is electrically connected to the detection device and is used to determine the operating state of the transformer according to the detection result and generate a fault alarm when the operating state of the transformer is abnormal.

[0054] Similarly, the system of this embodiment can perform the initial sampling at the top of the transformer outlet riser structure. The samples obtained can represent the overall level of the fault origin area, and can also reflect the fault situation through the detection results at the first time of the fault. Therefore, due to the rationality of the location of the sampling device, the system of this embodiment can have better timeliness and accuracy in judging the operating status of the transformer, and precisely because it can detect and generate fault alarms at the first time of the fault, it can be solved immediately after the fault is discovered to avoid burying hidden dangers. It has good accident prevention capabilities, which essentially improves the reliability of transformer operation, ensures the safety of personnel and facilities, and effectively reduces economic losses and social impacts.

[0055] In this embodiment, the sampling device includes an oil sampling device 21 and a gas sampling device 22. The oil sampling device 21 and the gas sampling device 22 are both arranged on the top of the lifting seat 2, and are used to obtain oil samples and gas samples of the top insulating oil in the outlet lifting seat structure respectively.

[0056] The detection device is used to detect the oil sample obtained by the oil sampling device 21 and the gas sample obtained by the gas sampling device 22, and obtain the detection results respectively; that is, the oil index condition of the obtained oil sample is detected to obtain the oil sample detection result; the gas analysis test is performed on the obtained gas sample to obtain the gas sample detection result; among which the oil index condition detection and gas analysis test can specifically adopt detection methods such as oil sample electrical, physical and chemical performance tests and gas content analysis. The specific detection method can be appropriately selected according to the specific conditions of different transformers, different operating conditions, etc.

[0057] The control unit generates a fault alarm when the transformer operating state is abnormal as judged by any test result of the gas sample and the oil sample; that is, when any test result of the oil sample test result or the gas sample test result does not meet the set requirements, the transformer operating state is judged to be abnormal. This set requirement can be set manually according to the specific operating conditions, and can be abnormal components (oil sample, gas sample), the content of one or several items exceeds the preset range, etc.

[0058] In this embodiment, an oil sampling valve can be set at the top of the lifting seat 2. The oil sampling valve is led down to the lower part of the transformer through a connecting pipe for easy operation by personnel, and then connected to conventional sample extraction components, etc., so that the oil sampling valve, connecting pipe, and sample extraction components form an oil sampling device 21 to take oil samples during product operation.

[0059] In this embodiment, an outlet pipeline is arranged at the highest point on the top of the lifting seat 2, and a gas relay is arranged on the outlet pipeline as a gas sampling device 22. The gas sampling box arranged on the gas relay serves as a gas sample container. The gas in the lifting seat 2 can be collected in time when the product is running, and the quality of the product operation process can be monitored by analyzing the gas quantity and composition.

[0060] In this embodiment, the system also includes a pressure release device 23, which is arranged at the lifting seat 2, and is used to detect the air pressure inside the transformer outlet lifting seat structure, and perform pressure release on the transformer outlet lifting seat structure when the air pressure exceeds the set value. When the pressure inside the lifting seat 2 rises to a set value due to a fault, the pressure release device 23 can be activated to reduce the pressure inside the lifting seat 2 by removing insulating oil and fault gas, so as to avoid secondary accidents such as explosion and fire caused by continuous pressure rise; specifically, the pressure release device 23 can adopt a pressure release valve, and the release pressure of the pressure release valve can be specifically selected according to the volume of the transformer outlet lifting seat structure, operating conditions, pressure requirements, etc.

[0061] Example 3

[0062] The transformer outlet lifting seat structure of this embodiment includes an outlet box 1, a lifting seat 2 and the transformer operation monitoring system in Example 2. The bottom end of the outlet box 1 is connected to the transformer oil tank 3, and the top end is connected to the lifting seat 2. The transformer operation monitoring system is connected to the lifting seat 2.

[0063] In this embodiment, the transformer outlet lifting seat structure also includes a vacuum device 24, which is used to vacuum the transformer outlet lifting seat structure. The vacuum device 24 can be a vacuum unit. The lifting seat 2 is provided with a valve interface 25. The valve interface 25 is connected to the vacuum device 24 during the transformer oil filling stage, and is connected to the pressure release device 23 during the transformer operation stage. The valve interface 25 provided on the lifting seat 2 can not only be used to connect the pressure release device 23 during operation, but also can be used to connect the vacuum device 24 during the vacuum oil filling link during the installation stage, so as to fill oil while vacuuming, ensure that the internal structure is immersed in oil, so as to improve the installation quality of the product and enhance the electrical insulation strength of the product. And because the use stages of the pressure release device 23 and the vacuum device 24 do not overlap, it is entirely possible to use the same valve interface 25 to avoid too many holes on the lifting seat 2. The valve interface 25 can select a suitable valve structure as needed.

[0064] The structure of this embodiment is suitable for the ultra-high voltage transformer adopting the indirect line outlet method, and the high-voltage lead is led out through an L-shaped outlet box; that is, the outlet box 1 is an L-shaped cylindrical structure, the horizontal section is connected to the transformer oil tank 3, and the vertical section is connected to the rising seat 2. An insulating molded outlet device 11 coaxial with the outlet box 1 is provided inside the outlet box 1. The high-voltage bushing 5 of the transformer is inserted into the rising seat 2 and the outlet box 1 in turn, and the bottom end of the insulating molded outlet device 11 extends into the oil tank, and the top end is connected to the high-voltage bushing 5, so that the lead 41 led out from the transformer body 4 can be connected to the high-voltage bushing 5 through the insulating molded outlet device 11.

[0065] In this embodiment, the inner diameter of the riser 2 is less than or equal to the inner diameter of the outlet box 1. That is, in this embodiment, the indirect outlet riser structure of the ultra-high voltage transformer adopts two diameter riser structures. The lower part adopts the L-shaped outlet box 1 riser structure, and the inner diameter of the upper riser 2 is slightly smaller than the diameter of the L-shaped outlet box (the structure of the riser 2 in this embodiment is as shown in FIG. Figure 1 As shown, it is a stepped structure, with a larger diameter at the lower end connected to the flange of the outlet box 1, and a smaller diameter at the upper end adapted to the built-in transformer). This embodiment limits the inner diameter of the riser 2 and adopts a riser with a relatively small diameter, whose inner diameter matches the size of the built-in transformer. The specific size is determined according to the outer diameter of the built-in transformer. In general, (the inner diameter of the riser 2) can be 60-80mm larger than the outer diameter of the built-in (current) transformer, thereby reducing the amount of transformer insulating oil and structural steel parts used; this riser 2 can be a vertical installation or an inclined installation structure.

[0066] In this embodiment, a flange 12 is provided inside the outlet box 1, and the top end of the insulating molded outlet device 11 is fixedly connected to the flange 12. An operation hole 13 is provided on the side wall of the outlet box 1. There are two operation holes 13, which are respectively located on the upper and lower sides of the position where the flange 12 is located, and are specifically located at the upper part and the middle part of the outlet box 1. During product production, the insulating molded outlet device 11 is assembled in the outlet box 1 by bolt fastening, and the assembly work is carried out through the flange 12 around it and the operation hole 13 set in the middle. Then, the upper riser 2 is assembled on the upper part of the outlet box 1, and finally the whole is assembled and fixed on the transformer oil tank 3, and is fixed to the transformer oil tank 3 by the upper bracket 6 described below, and the whole is supported by the lower bracket 7 in contact with the ground to improve its mechanical strength and earthquake resistance.

[0067] A current transformer can be installed inside the upper lifting seat 2 and led out through the secondary junction box. The inner diameter of the lifting seat 2 is determined according to the outer diameter of the current transformer, and the overall inner diameter is less than or equal to the L-shaped outlet box 1. This can reduce the amount of material used and improve the economy of the solution. A valve interface 25 and an oil sampling device 21 are respectively arranged on both sides of the upper lifting seat 2. A gas relay is arranged at the top of the lifting seat 2. The gas relay is connected to the oil storage cabinet pipeline of the transformer through a pipeline. The gas relay can also send an operation alarm to the transformer control system or signal the transformer to exit operation when the gas accumulation exceeds the set range or the oil flow speed in the pipeline exceeds the set value, so as to avoid accidents.

[0068] A gas extraction box is provided on the gas relay.

[0069] The lead wire 41 led out from the transformer body 4 is connected to the high-voltage bushing 5 through the L-shaped outlet box 1 and the insulating molded outlet device 11 inside it. The connection between the lead wire 41 and the tail of the high-voltage bushing 5 can be operated through the operation hole 13 set on the upper part of the L-shaped outlet box 1.

[0070] In this embodiment, the transformer outlet lifting seat structure also includes an upper bracket 6 and a lower bracket 7. The lower bracket 7 is supported and connected between the horizontal section of the outlet box 1 and the installation plane of the transformer oil tank 3; the upper bracket 6 is tied and connected between the vertical section of the outlet box 1 and the transformer oil tank 3. The L-shaped outlet box 1 is effectively fixed by two bracket components, one top support and one tie. The structural setting is reasonable and can provide a stable support effect.

[0071] The transformer outlet lifting seat structure of this embodiment is aimed at improving the structure of the ultra-high voltage oil-immersed power transformer with an indirect outlet structure, thereby improving its intrinsic reliability, and at the same time, by setting a pressure release device to avoid safety accidents in the event of a fault, reducing economic losses and social impact. The overall structure includes an L-shaped outlet box 1, an insulating molded outlet device 11, an operating hole 13, a lower bracket 7, a gas relay, an upper bracket 6, an oil sampling device 21, a valve interface 25, a pressure release valve, an upper lifting seat 2, and is appropriately connected with a transformer oil tank 3, an oil filling and draining valve 32, a lead 41, a transformer body 4 and a high-voltage bushing 5.

[0072] This embodiment can be applied to ultra-high voltage transformers, and relates to the technical field of transformer manufacturing, specifically, a riser seat structure of an ultra-high voltage power transformer with high-voltage indirect outlet. By arranging a valve and an oil sampling valve on the outlet riser seat, the reliability of the ultra-high voltage transformer with an indirect outlet structure is improved; the specific implementation plan is as follows: the lower part of the indirect outlet device adopts an L-shaped outlet box 1, and the upper bushing installation part adopts a relatively small diameter riser seat 2 to reduce the amount of product material used, and its inner diameter matches the size of the built-in transformer. A valve interface 25 is set on the upper edge of the upper riser seat 2. During the transformer installation stage, the vacuum device 24 is connected to the oil tank filling and draining valve 32 through the valve to realize vacuum oil filling and hot oil circulation in the high-voltage indirect outlet device (i.e., the transformer outlet riser seat structure of this embodiment), ensuring that the insulating parts and insulating oil in the high-voltage indirect outlet device can be fully exhausted and impurities removed, so that the overall insulation performance of the outlet device is more reliable. During the operation stage, a pressure release device 23 is installed on the valve interface 25. If an electrical fault occurs inside, the generated pressure can be quickly discharged from the outlet device lifting seat 2 through the pressure release device 23 to avoid the expansion of the impact of the fault. An oil sampling pipe joint is welded on the upper lifting seat 2. After the pipe joint is led down through the connecting pipe fixed on the cylinder wall, the insulating oil of the transformer in the lifting seat 2 can be sampled at the bottom of the transformer. The oil index of the lifting seat 2 can be monitored to monitor the operating status of the transformer; a gas relay is set on the exhaust pipe at the top of the transformer, and the gas changes in the outlet device are monitored in real time through the gas relay to ensure the safe and reliable operation of the transformer. The above measures are used to improve the reliability of ultra-high voltage transformers using indirect outlet structure products.

[0073] It can be said that this embodiment improves the internal insulation reliability of ultra-high voltage products through structural improvements and process scheme improvements during transformer design, and improves the overall reliability of ultra-high voltage transformer transformation through operating process status monitoring and emergency structure design in fault conditions.

[0074] Example 4

[0075] The transformer of this embodiment includes a transformer oil tank 3, a transformer body 4, a high-voltage bushing 5 and the transformer outlet riser structure in Embodiment 3. The transformer outlet riser structure is connected to the transformer oil tank 3, the high-voltage bushing 5 is inserted into the transformer outlet riser structure, the transformer body 4 is accommodated in the transformer oil tank 3, and the lead wire 41 led out from the transformer body 4 is connected to the high-voltage bushing 5 through the transformer outlet riser structure.

[0076] In this embodiment, the transformer also includes an oil filter 31 for filtering insulating oil. The transformer oil tank 3 is provided with an oil filling and draining valve 32, which is connected to the oil filter 31 during the transformer oil filling stage, thereby cooperating with the vacuum pump 24 to achieve full exhaust and oil immersion inside the outlet box 1.

[0077] After the transformer of this embodiment is assembled, the oil filter 31 of the transformer is connected to the oil filling and draining valve 32 at the bottom of the transformer oil tank 3 during the vacuum oil filling stage of the core process of transformer production. The vacuum pumping device 24 can adopt a vacuum unit, and the vacuum unit is connected to the transformer body and the valve interface 25 arranged on the upper riser 2. The upper vacuum pumping and the lower oil filling method ensure that the insulating molded outlet device 11 and the lead 41 inside the L-shaped outlet box 1 can be fully exhausted and immersed in oil, so that the insulation reliability of the overall structure is greatly improved, and local discharge and insulation degradation caused by moisture, impurities, gas, etc. during operation are avoided.

[0078] After the vacuum oil filling of the transformer is completed, the oil filter 31 and the vacuum unit are removed, and the pressure release device 23 is installed at the valve interface 25. The pressure release device 23 and the oil sampling device 21 are led down to the lower part of the transformer through a connecting pipe for easy operation by personnel. The connecting pipe is fixed to the side wall of the L-shaped outlet box 1 with a bolt assembly structure. The pressure release device 23 can also be led down with a connecting pipe to guide the oil spray, so as to prevent the internal insulating oil from spraying around when the pressure release valve is actuated.

[0079] During the operation of the transformer, the insulating oil sample inside the L-shaped outlet box 1 can be regularly extracted through the oil sampling device 21, and the gas sample can be extracted through the gas relay. Through the electrical and physical and chemical performance tests of the oil samples and the gas content analysis, it can be timely determined whether the transformer has hidden fault hazards; when the internal outlet line of the transformer L-shaped outlet box 1 fails, causing the internal pressure of the device to increase, the internal oil or faulty gas can be discharged in time through the pressure release device 23 to avoid accidents such as product explosion and fire due to the increase in pressure.

[0080] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A transformer operation monitoring method, characterized in that: The method is used when the transformer is running, and the method includes a detection step and a judgment step, and the detection step includes: Obtain samples from the top of the outlet riser structure; Testing the obtained sample to obtain a test result; The judging step comprises: The transformer operating status is determined based on the detection results, and a fault alarm is generated when the transformer operating status is abnormal.

2. The transformer operation monitoring method according to claim 1, characterized in that: The method of obtaining a sample from the top of the outlet lift structure specifically includes: Obtain an oil sample of the insulating oil at the top of the outlet riser structure, and / or obtain a gas sample of the gas at the top of the outlet riser structure.

3. The transformer operation monitoring method according to claim 1 or 2, characterized in that: The method further comprises an execution step, wherein the execution step comprises: The air pressure inside the outlet lift seat structure is detected, and the pressure of the outlet lift seat structure is released when the air pressure exceeds the set value.

4. A transformer operation monitoring system, used when the transformer is in operation, characterized in that: include: A sampling device is arranged at a raised seat (2) of the transformer outlet raised seat structure and is used to obtain a sample from the top of the outlet raised seat structure when the transformer is running; A detection device, used to detect the sample obtained by the sampling device to obtain a detection result; The control unit is electrically connected to the detection device and is used to determine the operating state of the transformer according to the detection result and generate a fault alarm when the operating state of the transformer is abnormal.

5. The transformer operation monitoring system according to claim 4, characterized in that: The sampling device comprises an oil sampling device (21), and / or a gas sampling device (22), The oil sampling device (21) is arranged on the top of the lifting seat (2) and is used to obtain an oil sample of the insulating oil at the top of the transformer outlet lifting seat structure; The gas sampling device (22) is arranged on the top of the lifting seat (2) and is used to obtain gas samples of the gas at the top of the transformer outlet lifting seat structure.

6. The transformer operation monitoring system according to claim 4, characterized in that: It also includes a pressure release device (23) which is arranged at the lifting seat (2) and is used to detect the air pressure inside the transformer outlet lifting seat structure and to release the pressure on the transformer outlet lifting seat structure when the air pressure exceeds a set value.

7. A transformer outlet lifting seat structure, characterized in that: It comprises an outlet box (1), a riser (2) and the transformer operation monitoring system according to claim 6, The bottom end of the outlet box (1) is connected to the transformer oil tank (3), and the top end is connected to the elevated seat (2), and the transformer operation monitoring system is connected to the elevated seat (2).

8. The transformer outlet cable raising seat structure according to claim 7, characterized in that: It also includes a vacuum device (24) for vacuuming the transformer outlet wire lifting seat structure. The lifting seat (2) is provided with a valve interface (25), and the valve interface (25) is connected to the vacuum pumping device (24) during the transformer oil filling stage, and is connected to the pressure release device (23) during the transformer operation stage.

9. The transformer outlet cable raising seat structure according to claim 7, characterized in that: The outlet box (1) is an L-shaped cylindrical structure, the horizontal section is connected to the transformer oil tank (3), the vertical section is connected to the elevated seat (2), and an insulating molded outlet device (11) coaxial with the outlet box (1) is provided inside the outlet box (1). The high-voltage bushing (5) of the transformer is inserted into the riser (2) and the outlet box (1) in sequence. The bottom end of the insulating molded lead-out device (11) extends into the transformer oil tank (3), and the top end is connected to the high-voltage bushing (5), so that the lead wire (41) led out from the transformer body (4) can be connected to the high-voltage bushing (5) through the insulating molded lead-out device (11).

10. The transformer outlet cable raising seat structure according to claim 9, characterized in that: The inner diameter of the raised seat (2) is smaller than or equal to the inner diameter of the outlet box (1).

11. The transformer outlet cable raising seat structure according to claim 9, characterized in that: The outlet box (1) is provided with a flange (12) inside, and the top end of the insulating molded outlet device (11) is fixedly connected to the flange (12). An operating hole (13) is provided on the side wall of the outlet box (1), and two operating holes (13) are provided, respectively located at the upper and lower sides of the position where the flange (12) is located.

12. The transformer outlet cable raising seat structure according to claim 9, characterized in that: It also includes an upper bracket (6) and a lower bracket (7), The lower bracket (7) is supported and connected between the horizontal section of the outlet box (1) and the installation plane of the transformer oil tank (3); The upper bracket (6) is connected between the vertical section of the outlet box (1) and the transformer oil tank (3).

13. A transformer, characterized in that: The invention comprises a transformer oil tank (3), a transformer body (4), a high-voltage bushing (5) and a transformer outlet lifting seat structure as claimed in any one of claims 7 to 12, The transformer outlet lifting seat structure is connected to the transformer oil tank (3). The high-voltage bushing (5) is inserted into the transformer outlet riser structure. The transformer body (4) is accommodated in the transformer oil tank (3), and the lead wire (41) led out from the transformer body (4) is connected to the high-voltage bushing (5) through the transformer lead-out lifting seat structure.

14. The transformer according to claim 13, characterized in that: It also includes an oil filter (31) for filtering insulating oil. The transformer outlet lifting seat structure is specifically the transformer outlet lifting seat structure in claim 8, The transformer oil tank (3) is provided with an oil filling and draining valve (32), which is connected to the oil filter (31) during the transformer oil filling stage, thereby cooperating with the vacuum pumping device (24) to achieve full exhaust and oil immersion inside the outlet box (1).

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