Safety fault detection equipment for oil-immersed transformer

Abstract

The invention discloses a safety fault detection device for an oil-immersed transformer, and relates to the technical field of oil-immersed transformer temperature detection, the safety fault detection device comprises a detection mechanism, the detection mechanism is arranged on a cover plate of a transformer body oil tank, and the detection end of the detection mechanism extends into the transformer body oil tank and is immersed in oil; a cooling mechanism is further arranged on one side of the transformer body, the cooling mechanism is set to be in a closed state in a normal state, and when the detection mechanism detects that the oil temperature of the transformer body is too high and reaches the upper limit temperature, the cooling mechanism is started. The invention aims to solve the problem that the detection performance of a sensor is easily affected by high temperature for a long time when the sensor is immersed in oil for a long time and the like when the oil temperature of a transformer is detected in the prior art. The device has the advantages that the oil temperature is pre-detected through the detection mechanism, then the oil temperature is further accurately detected through the temperature sensor, and the situation that the detection performance of the sensor is affected by high temperature for a long time is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of temperature detection of oil-immersed transformers, and in particular to a safety fault detection device for oil-immersed transformers. Background Art

[0002] An oil-immersed transformer is a transformer that relies on oil as a cooling medium. It generally consists of two parts: the body and the oil tank. It usually uses three cooling methods: oil-immersed self-cooling, oil-immersed air cooling, and forced oil circulation.

[0003] In the prior art, the oil temperature of an oil-immersed transformer needs to be monitored during operation to prevent the oil temperature from being too high and affecting the service life of the transformer. When monitoring the oil temperature, a temperature sensor is usually provided inside the transformer to monitor the cooling oil. However, in actual work, the temperature sensor is provided in the oil tank and the sensor is immersed in the oil for a long time, which makes the sensor susceptible to the influence of high temperature for a long time and causes itself to heat up for a long time and affects the detection performance. Therefore, the sensor is immersed in the oil for a long time and is affected by the high temperature of the oil, which will damage the detection performance of the sensor and affect the detection result of the oil temperature.

[0004] In response to the above technical problems, the present invention discloses a safety fault detection device for an oil-immersed transformer. The present invention has the advantages of setting a detection mechanism to pre-detect the oil temperature. When the oil temperature reaches an upper limit, the oil temperature is further accurately detected by a temperature sensor, thereby avoiding the temperature sensor being set inside the oil tank and being affected by high temperature for a long time, thereby affecting the detection performance. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a safety fault detection device for an oil-immersed transformer to solve the technical problems in the prior art that when detecting the oil temperature of the transformer, the sensor is immersed in oil for a long time, the sensor is easily affected by high temperature for a long time, and the detection performance is affected. The present invention has the advantages of setting a detection mechanism, and then pre-detecting the oil temperature through the detection mechanism. When the oil temperature reaches the upper limit, the oil temperature is further accurately detected by the temperature sensor, so as to avoid the temperature sensor being set inside the oil tank and being affected by high temperature for a long time, thereby affecting the detection performance.

[0006] The present invention is implemented through the following technical solutions: The present invention discloses a safety fault detection device for an oil-immersed transformer, comprising a detection mechanism, the detection mechanism is arranged on a cover plate of an oil tank of a transformer body, and a detection end of the detection mechanism extends to the inside of the oil tank of the transformer body and is immersed in the oil, a cooling mechanism is also arranged on one side of the transformer body, and the cooling mechanism is set to a closed state under normal conditions, when the detection mechanism detects that the oil temperature of the transformer body is too high and reaches an upper limit temperature, the cooling mechanism is turned on, and the opening of the cooling mechanism is electrically controlled by a central control module, and the detection mechanism is electrically connected to the central control module;

[0007] The detection mechanism includes a sensing component and a detection component, wherein the sensing component is arranged above the transformer body cover plate, and the detection component is embedded in the transformer body cover plate, and the top and bottom ends of the detection component are respectively located above and below the transformer body cover plate;

[0008] The detection assembly includes a detection cylinder, a positioning ring, a piston disc, a connecting rod and a sensing member 1. The detection cylinder is embedded in the cover plate of the transformer body, a positioning ring is fixedly arranged inside the detection cylinder, and the detection cylinder is divided into an upper cylinder section and a lower cylinder section by the positioning ring. The lower cylinder section of the detection cylinder is located below the cover plate of the transformer body and immersed in oil, and the upper cylinder section is located above the cover plate of the transformer body. A piston disc is also slidably arranged inside the detection cylinder, and the outer circumferential outer wall of the piston disc is slidably sealed with the inner wall of the detection cylinder. The piston disc is located above the positioning ring and contacts with the upper end surface of the positioning ring. Gas is filled in the lower cylinder section. A connecting rod is fixedly arranged above the piston disc, and the top end of the connecting rod passes through the top wall of the detection cylinder and extends to the top of the outside of the detection cylinder. A sensing member 1 is fixedly arranged on one end of the connecting rod located above the outside of the detection cylinder, and the sensing assembly is located above the sensing member 1, and the sensing member 1 contacts the sensing assembly to start the cooling mechanism.

[0009] Furthermore, the detection tube is configured to be made of a heat-conducting material, and the piston disc is slidably sealed with the inner wall of the detection tube via a sealing rubber ring.

[0010] Furthermore, the cooling mechanism includes a cooling water tank, a cooling water pipe and a water pump. The cooling water tank is arranged on one side of the transformer body through a base. One end of the cooling water pipe is located above the inside of the transformer body oil tank, and the other end of the cooling water pipe extends from the top of the cooling water tank to the inside of the cooling water tank and then extends from the bottom of the cooling water tank to the bottom of the transformer body oil tank to form a cooling circulation pipeline. A water pump is also installed on the cooling water pipe to provide power for the circulation of oil. The water pump is electrically connected to the central control module through a wire.

[0011] Furthermore, a temperature sensor is installed at the oil inlet end of the cooling water pipe, and the temperature sensor is located outside the transformer body, and the temperature sensor is electrically connected to the central control module.

[0012] Furthermore, the sensing height of the sensing component is configured to be adjustable according to the ambient temperature.

[0013] Furthermore, the induction assembly includes an induction cylinder, a limiting ring, a movable disk, a movable rod and an induction member 2. The induction cylinder is fixedly arranged above the cover plate of the transformer body, and the induction cylinder includes a cylinder 1 and a cylinder 2. The cylinder 2 is fixedly arranged at the top of the cylinder 1 and are concentric with each other. A limiting ring is also fixedly arranged inside the cylinder 2. A movable disk is arranged above the limiting ring, and the movable disk and the inner wall of the cylinder 2 are slidingly sealed. Thermal expansion material is arranged inside the cylinder 1. A movable rod is fixedly arranged above the movable disk, and the other end of the movable rod passes through the top wall of the cylinder 2. The end of the movable rod located outside the cylinder 2 is fixedly arranged with the induction member 2, and the induction member 2 is located above the induction member 1 and is coaxially arranged.

[0014] Furthermore, the material of the tube one is set to be a heat-conducting material, the inner diameter of the tube one is larger than the inner diameter of the tube two, and when the sensing element one contacts the sensing element two, a signal is sent to the central control module.

[0015] Furthermore, the heat-expandable material inside the tube 1 is set to mercury.

[0016] The present invention has the following advantages:

[0017] The present invention sets a detection mechanism, a cooling mechanism and a temperature sensor, so that when the oil temperature inside the transformer body rises, the gas inside the detection tube expands to make the sensing element rise, and the sensing height of the sensing component is set at a position corresponding to the upper limit temperature of the oil temperature, so that when the oil temperature reaches the upper limit temperature, the sensing element rises and contacts the sensing component and sends a signal, so that the cooling mechanism is started, and the water pump is started to let the high-temperature oil inside the transformer body enter the cooling water tank through the cooling water pipe to exchange heat with the coolant for cooling, so as to cool the oil urgently, and at the same time, the temperature of the oil entering the cooling water pipe is detected by the temperature sensor at the cooling water pipe, so that the staff can obtain accurate oil temperature, therefore, the temperature sensor does not need to be set inside the oil tank, so as to avoid the temperature sensor being immersed in the oil and causing the temperature sensor to be affected by high temperature for a long time and affecting the detection performance, and in addition, by setting the sensing component, the sensing height of the sensing component can be adjusted with the ambient temperature, so that when the oil temperature reaches the upper limit temperature, the sensing element contacts the sensing component to start the cooling mechanism, and the upper limit temperature of the oil temperature can be combined with the ambient temperature, so that the starting timing of the cooling mechanism is more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the detection tube and the sensing tube of the present invention;

[0020] Figure 3 For the present invention Figure 2 A local enlarged structural schematic diagram;

[0021] Figure 4 For the present invention Figure 1 A schematic diagram of the local enlarged structure at C;

[0022] Figure 5 For the present invention Figure 2 Schematic diagram of the local enlarged structure at point B.

[0023] In the figure: 1. detection mechanism; 2. transformer body; 3. base; 4. cooling mechanism; 5. central control module; 6. temperature sensor; 101. induction component; 102. detection component; 121. detection cylinder; 122. positioning ring; 123. piston disk; 124. connecting rod; 125. induction piece 1; 211. upper cylinder section; 212. lower cylinder section; 401. cooling water tank; 402. cooling water pipe; 403. water pump; 111. induction cylinder; 112. limit ring; 113. moving disk; 114. moving rod; 115. induction piece 2; 1111. cylinder 1; 1112. cylinder 2. DETAILED DESCRIPTION

[0024] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. However, the protection scope of the present invention is not limited to the following embodiments. In the description of the present invention, words indicating directions or positional relationships such as "front", "rear", "left", and "right" are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] The embodiment discloses a safety fault detection device for an oil-immersed transformer, such as Figure 1-Figure 5 As shown, it includes a detection mechanism 1, such as Figure 1 and Figure 2As shown, the detection mechanism 1 is arranged on the cover plate of the oil tank of the transformer body 2, and the detection end of the detection mechanism 1 extends to the inside of the oil tank of the transformer body 2, so that the detection end of the detection mechanism 1 can be immersed in the oil, and then the oil temperature is detected, and the transformer body 2 is fixedly mounted on the base 3, and a cooling mechanism 4 is also arranged above the base 3, and the cooling mechanism 4 is set to a closed state under normal conditions. When the detection mechanism 1 detects that the oil temperature of the transformer body 2 is too high, the cooling mechanism 4 is turned on, and the opening of the cooling mechanism 4 is electrically controlled by the central control module 5, and the detection mechanism 1 is electrically connected to the central control module 5. The specific relationship between the detection mechanism 1, the central control module 5 and the cooling mechanism 4 is set to be that when the detection mechanism 1 detects that the oil temperature of the transformer body 2 rises to the upper limit, the detection mechanism 1 sends a signal to the central control module 5, and the central control module 5 immediately starts the cooling mechanism 4 to start the emergency cooling treatment of the oil inside the transformer body 2;

[0026] Considering that when the oil temperature inside the transformer body 2 is monitored, the detection end of the detection mechanism 1 needs to be immersed in the oil, so that the oil temperature can be accurately detected. However, when the detection end of the detection mechanism 1 is immersed in the oil for a long time, the sensor will be easily affected by the high temperature for a long time, causing itself to heat up for a long time and affect the detection performance. Therefore, the sensor is immersed in the oil for a long time and affected by the high temperature of the oil, which will cause the detection performance of the sensor to be damaged, thereby affecting the detection result of the oil temperature;

[0027] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, the detection mechanism 1 is configured to include a sensing component 101 and a detection component 102, wherein the sensing component 101 is disposed above the cover plate of the transformer body 2, and the detection component 102 is embedded in the cover plate of the transformer body 2, one end of the detection component 102 is located above the cover plate, and the other end of the detection component 102 is located below the cover plate and immersed in the oil tank;

[0028] Specifically, Figure 1-Figure 3As shown, the detection assembly 102 includes a detection cylinder 121, a positioning ring 122, a piston disc 123, a connecting rod 124 and a sensing element 125, wherein the detection cylinder 121 is set to a heat-conducting material, for example, a heat-conducting metal material, and the upper and lower parts of the detection cylinder 121 are set to a sealed state, the detection cylinder 121 is fixedly embedded in the cover plate of the transformer body 2, and the positioning ring 122 is fixedly set inside the detection cylinder 121. It should be noted that, with the positioning ring 122 as a dividing point, the inside of the detection cylinder 121 is divided into an upper cylinder section 211 and a lower cylinder section 212, and the lower part of the detection cylinder 121 with the positioning ring 122 as a dividing point is the lower cylinder section 212, and the lower cylinder section 212 is located below the cover plate of the transformer body 2 and immersed in the oil, with the positioning ring 122 as a dividing point. The part above the point is the upper cylinder section 211, and the upper cylinder section 211 is above the cover plate. In addition, a piston disc 123 is slidably arranged inside the detection cylinder 121, and the outer circumferential outer wall of the piston disc 123 is slidably sealed with the inner wall of the detection cylinder 121. The piston disc 123 is located above the positioning ring 122 and contacts the upper end surface of the positioning ring 122. More specifically, a sealing rubber ring is arranged on the outer circumferential outer wall of the piston disc 123, and the sliding seal between the piston disc 123 and the detection cylinder 121 is achieved through the sealing rubber ring. It should be noted that the sealing rubber ring is set to a high temperature resistant material. Therefore, the interior of the detection cylinder 121 is separated by the piston disc 123, so that the lower cylinder section 212 inside the detection cylinder 121 is a sealed compartment, and the interior of the lower cylinder section 212 can be filled with gas.

[0029] According to the law of gas expansion, when a certain volume of gas is heated, it will expand in volume. Therefore, when the oil temperature inside the transformer body 2 increases, the gas inside the lower barrel section 212 will be heated, and the gas heating will cause the volume to expand and thus push the piston disc 123 upward. In addition, a connecting rod 124 is fixedly arranged above the piston disc 123, and the top of the connecting rod 124 passes through the top wall of the detection cylinder 121 and extends to the top of the outside of the detection cylinder 121. In addition, a sensing element 125 is fixedly arranged at one end of the connecting rod 124 located above the outside of the detection cylinder 121. Therefore, as the oil temperature inside the transformer body 2 increases, the sensing element 125 will gradually When the oil temperature inside the transformer body 2 is at a fixed temperature, the induction member 125 will also move to a fixed height. In the prior art, the upper oil temperature of the transformer in my country shall not exceed 95°C. When the oil temperature inside the transformer body 2 rises to 95°, the oil temperature of the transformer body 2 reaches the upper limit. Therefore, by setting the induction component 101 at the height to which the induction member 125 moves when the oil temperature rises to 95°, when the oil temperature inside the transformer body 2 rises to 95°, the induction member 125 contacts the induction component 101 and sends a signal to the central control module 5, so that the central control module 5 starts the cooling mechanism 4 to cool the oil inside the oil tank.

[0030] Therefore, by setting the structures such as the detection tube 121 and the piston disk 123, it is prevented that the electronic components inside the sensor are easily damaged by being affected by high temperature for a long time when the temperature is detected by the sensor;

[0031] Specifically, Figure 1 As shown, the cooling mechanism 4 includes a cooling water tank 401, a cooling water pipe 402 and a water pump 403, wherein the cooling water tank 401 is fixedly arranged above the base 3, and a coolant is arranged inside the cooling water tank 401, and one end of the cooling water pipe 402 is fixedly connected to the outer wall of the oil tank of the transformer body 2, and one end of the cooling water pipe 402 extends to the inside of the oil tank of the transformer body 2 and is located above the inside of the oil tank, and the other end of the cooling water pipe 402 extends from the top of the cooling water tank 401 to the inside of the cooling water tank 401 and extends out from the bottom of the cooling water tank 401. In addition, the cooling water pipe The other end of the cooling water pipe 402 extending from the bottom of the cooling water tank 401 is fixedly connected to the outer wall of the transformer body 2 and extends to the bottom of the oil tank. A water pump 403 is also installed at the cooling water pipe 402. The oil in the oil tank is sucked out by the water pump 403 and the cooling water pipe 402, and when the oil enters the cooling water tank 401 from the cooling water pipe 402, it exchanges heat with the coolant in the cooling water tank 401. Then, the oil enters the oil tank from the cooling water pipe 402, thereby exchanging heat and cooling the oil in the transformer body 2. The water pump 403 is electrically connected to the central control module 5 through a wire.

[0032] Since the oil temperature is detected by the detection mechanism 1, the detection mechanism 1 only starts the cooling mechanism 4 to perform emergency cooling of the oil temperature when the oil temperature reaches the upper limit temperature. The staff cannot accurately know the oil temperature. In order to further improve the accuracy of the oil temperature detection of the transformer body 2, Figure 1 and Figure 4 As shown, a temperature sensor 6 is installed at one end where the cooling water pipe 402 is connected to the top of the oil tank of the transformer body 2. In other words, the temperature sensor 6 is arranged at the water inlet end of the cooling water pipe 402, and the temperature sensor 6 is located at a section of the cooling water pipe 402 that is outside the transformer body 2, so that the temperature sensor 6 is outside the transformer body 2. Therefore, the upper limit oil temperature of the oil tank is pre-detected by the detection mechanism 1. When the oil temperature of the oil tank reaches the upper limit, the water pump 403 is started, and the cooling water pipe 402 exchanges heat and cools the oil inside the oil tank with the coolant through the cooling water tank 401, and circulates. At this time, the temperature sensor 6 at the water inlet end of the cooling water pipe 402 detects the oil temperature of the oil entering the cooling water pipe 402, and the temperature sensor 6 is electrically connected to the central control module 5. In addition, by setting a remote terminal in the central control module 5, the staff can obtain the accurate value of the oil temperature, so that the staff can know how much the oil temperature exceeds the limit, which is convenient for the staff to make maintenance judgments on the transformer body 2;

[0033] By setting up the detection mechanism 1 and the temperature sensor 6, the detection mechanism 1 can be used for pre-detection. After the pre-detection temperature reaches the upper limit, the oil enters the cooling water pipe 402. At this time, the temperature sensor 6 is used for accurate detection, thereby preventing the temperature sensor 6 from being immersed in oil for a long time, and preventing the temperature sensor 6 from being damaged by the high temperature for a long time.

[0034] Furthermore, when the upper limit of the oil temperature is detected by the detection mechanism 1, since the oil temperature inside the transformer body 2 will be affected by the ambient temperature, the temperature rise standard of the transformer in my country is based on the ambient temperature of 40°C, so the upper oil temperature of the transformer shall not exceed 40°C+55°C=95°C. When the ambient temperature is 40°, that is, the oil temperature of the transformer body 2 shall not exceed 95°, that is, 95° is the highest upper limit temperature, but when the ambient temperature does not reach 40°, that is, the upper limit temperature will be lower than 95°. For example, when the ambient temperature is 35°, 35°+55°=90°, and the induction component 101 is set at a height of 95°, when the oil temperature has exceeded the limit, the induction component 101 and the induction member 125 cannot contact each other, and then the cooling mechanism 4 cannot be started, and no signal can be sent, which will cause the oil temperature to be too high for a long time and cause losses;

[0035] Therefore, in this embodiment, the sensing height of the sensing component 101 is set to be adjustable according to the ambient temperature. Specifically, Figure 1 , Figure 2 and Figure 5As shown, the induction assembly 101 includes an induction tube 111, a limiting ring 112, a moving disk 113, a moving rod 114 and a second induction member 115, wherein the induction tube 111 is fixedly arranged above the cover plate of the transformer body 2, and the induction tube 111 specifically includes a tube 1 1111 and a tube 2 1112, wherein the tube 2 1112 is fixedly arranged at the top of the tube 1 1111, and the tube 1 1111 is arranged above the cover plate of the transformer body 2, the tube 2 1112 and the tube 1 1111 are concentric with each other and communicated with each other, the inner diameter of the tube 1 1111 is larger than the inner diameter of the tube 2 1112, the inner part of the tube 2 1112 is also fixedly arranged with a limiting ring 112, and the moving disk 113 is arranged above the limiting ring 112, and the moving disk 113 and the tube 2 111 are connected to each other. 2 is matched with the inner wall sliding seal, the interior of the cylinder 1 1111 is provided with a heat-expanding material, which can be specifically set as mercury. In addition, the material of the cylinder 1 1111 is set as a heat-conducting material. Since the cylinder 1 1111 and the cylinder 2 1112 are both arranged above the cover plate, the cylinder 1 1111 is at the ambient temperature. Therefore, the heat-expanding material can expand through the increase of the ambient temperature, thereby pushing the moving disk 113 to rise. In addition, a moving rod 114 is fixedly arranged above the moving disk 113, and the other end of the moving rod 114 passes through the top wall of the cylinder 2 1112, and the end of the moving rod 114 located outside the cylinder 2 1112 is fixedly provided with a sensing piece 2 115, and the sensing piece 2 115 and the sensing piece 1 125 are on the same vertical axis, and the sensing piece 2 115 and the sensing piece 1 125 are on the same vertical axis. 15 is located above the sensing element 125. By setting the height of the limiting ring 112, when the ambient temperature is 30 degrees, the volume of the heat-expandable material expands to make the movable plate 113 above the limiting ring 112 and in contact with the limiting ring 112. Therefore, the upper limit temperature of the oil temperature is 85 degrees at this time. In addition, the position of the sensing element 115 is set at the position where the sensing element 125 is located when the oil temperature reaches 85 degrees. In other words, when the ambient temperature is 30 degrees or lower than 30 degrees, the movable plate 113 is always above the limiting ring 112 and in contact with the limiting ring 112, and the position of the sensing element 115 is always at 85 degrees. The position of the sensing element 125 is located when the ambient temperature is 30 degrees or lower than 30 degrees. When the oil temperature inside the oil tank rises to 85°, the oil temperature in the oil tank reaches the upper limit. At this time, the gas inside the detection cylinder 121 expands due to heat, causing the piston disk 123 to move up, thereby causing the induction member 125 to move up and contact the induction member 2 115 to start the cooling mechanism 4. Correspondingly, when the ambient temperature reaches above 30°, for example, when the ambient temperature reaches 40°, the upper limit of the oil temperature is 95°. The heat-expanded material inside the cylinder 1111 at 40° will cause the movable disk 113 to move up, thereby causing the position of the induction member 2 115 to move up to a height higher than the corresponding height of 85°. At this time, when the oil temperature reaches 85°, the induction member 125 will not contact the induction member 2 115, thereby causing the transformer body 2 to work normally. Only when the oil temperature reaches 95°,The induction member 125 moves upward and contacts the induction member 115 to start the cooling mechanism 4. Therefore, the contact between the induction member 125 and the induction member 115 can be combined with the ambient temperature to start the cooling mechanism 4, so that the timing of starting the cooling mechanism 4 is more reasonable;

[0036] Specifically, the sensing element 125 and the sensing element 2 115 can be configured as sensors, so that the sensing element 125 and the sensing element 2 115 contact each other and send a signal to the central control module 5 , so that the central control module 5 starts the water pump 403 to perform heat exchange cooling of the oil.

[0037] The principle of the present invention is as follows: when the present invention is in operation, when the oil temperature inside the transformer body 2 rises, the gas inside the lower barrel section 212 will be heated, and the heated gas will expand in volume and push the piston disc 123 upward. Therefore, as the oil temperature inside the transformer body 2 rises, the induction member 125 will also gradually rise. When the oil temperature inside the transformer body 2 is at a fixed temperature, the induction member 125 will also move to a fixed height. In the prior art, the upper oil temperature of my country's transformers shall not exceed 95°C. When the oil temperature inside the transformer body 2 rises to 95°, the oil temperature of the transformer body 2 reaches the upper limit. Therefore, by setting the induction component 101 at the height to which the induction member 125 moves when the oil temperature rises to 95°, When the oil temperature inside the transformer body 2 rises to 95°, the induction element 125 contacts the induction component 101 and sends a signal to the central control module 5, and then the central control module 5 starts the cooling mechanism 4 to cool the oil inside the oil tank, the water pump 403 starts, and the cooling water pipe 402 exchanges heat and cools the oil inside the oil tank through the cooling water tank 401 with the coolant, and circulates the oil. At this time, the temperature sensor 6 at the water inlet end of the cooling water pipe 402 detects the oil temperature of the oil entering the cooling water pipe 402, and by setting a remote terminal in the central control module 5, the staff can obtain the accurate value of the oil temperature, so that the staff can know how much the oil temperature exceeds the limit, which is convenient for the staff to make maintenance judgments on the transformer body 2.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A safety fault detection device for an oil-immersed transformer, comprising a detection mechanism (1), characterized in that: The detection mechanism (1) is arranged on a cover plate of the oil tank of the transformer body (2), and a detection end of the detection mechanism (1) extends to the interior of the oil tank of the transformer body (2) and is immersed in the oil. A cooling mechanism (4) is also arranged on one side of the transformer body (2), and the cooling mechanism (4) is set to a closed state under normal conditions. When the detection mechanism (1) detects that the oil temperature of the transformer body (2) is too high and reaches an upper limit temperature, the cooling mechanism (4) is turned on. The opening of the cooling mechanism (4) is electrically controlled by a central control module (5), and the detection mechanism (1) is electrically connected to the central control module (5); The detection mechanism (1) comprises a sensing component (101) and a detection component (102), wherein the sensing component (101) is arranged above a cover plate of a transformer body (2), and the detection component (102) is embedded in the cover plate of the transformer body (2), and the top end and the bottom end of the detection component (102) are respectively located above and below the cover plate of the transformer body (2); The detection assembly (102) comprises a detection cylinder (121), a positioning ring (122), a piston disc (123), a connecting rod (124) and a sensing element (125). The detection cylinder (121) is embedded in the cover plate of the transformer body (2). The detection cylinder (121) is fixedly provided with a positioning ring (122) inside. The detection cylinder (121) is divided into an upper cylinder section (211) and a lower cylinder section (212) by the positioning ring (122). The lower cylinder section (212) of the detection cylinder (121) is located below the cover plate of the transformer body (2) and immersed in oil. The upper cylinder section (211) is located above the cover plate of the transformer body (2). The detection cylinder (121) is also slidably provided with a piston disc (123) inside. The piston disc (123) The outer circumferential wall of the detection tube (123) is slidably sealed with the inner wall of the detection tube (121); the piston disk (123) is located above the positioning ring (122) and contacts the upper end surface of the positioning ring (122); the interior of the lower tube section (212) is filled with gas; a connecting rod (124) is fixedly arranged above the piston disk (123); the top end of the connecting rod (124) penetrates the top wall of the detection tube (121) and extends to the top of the outside of the detection tube (121); a sensing element 1 (125) is fixedly arranged at one end of the connecting rod (124) located above the outside of the detection tube (121); the sensing component (101) is located above the sensing element 1 (125), and the sensing element 1 (125) contacts the sensing component (101) so that the cooling mechanism (4) is started.

2. A safety fault detection device for an oil-immersed transformer according to claim 1, characterized in that: The detection tube (121) is made of a heat-conducting material, and the piston disc (123) is slidably sealed with the inner wall of the detection tube (121) via a sealing rubber ring.

3. A safety fault detection device for an oil-immersed transformer as claimed in claim 2, characterized in that: The cooling mechanism (4) comprises a cooling water tank (401), a cooling water pipe (402) and a water pump (403); the cooling water tank (401) is arranged on one side of the transformer body (2) through a base (3); one end of the cooling water pipe (402) is located above the inside of the oil tank of the transformer body (2); the other end of the cooling water pipe (402) extends from the top of the cooling water tank (401) to the inside of the cooling water tank (401) and then extends from the bottom of the cooling water tank (401) to the bottom of the oil tank of the transformer body (2) to form a cooling circulation pipeline; a water pump (403) is also installed at the cooling water pipe (402) to provide power for the circulation of oil; the water pump (403) is electrically connected to the central control module (5) through a wire.

4. A safety fault detection device for an oil-immersed transformer as claimed in claim 3, characterized in that: A temperature sensor (6) is installed at the oil inlet end of the cooling water pipe (402), and the temperature sensor (6) is located outside the transformer body (2). The temperature sensor (6) is electrically connected to the central control module (5).

5. A safety fault detection device for oil-immersed transformers as claimed in claim 4, characterized in that: The sensing height of the sensing component (101) is configured to be adjustable according to the ambient temperature.

6. A safety fault detection device for an oil-immersed transformer as claimed in claim 5, characterized in that: The induction assembly (101) comprises an induction tube (111), a limiting ring (112), a movable plate (113), a movable rod (114) and a second induction member (115); the induction tube (111) is fixedly arranged above a cover plate of a transformer body (2); the induction tube (111) comprises a first tube (1111) and a second tube (1112); the second tube (1112) is fixedly arranged at the top of the first tube (1111) and is concentric with each other; a limiting ring (112) is also fixedly arranged inside the second tube (1112); the upper end of the limiting ring (112) is A moving disk (113) is provided on the side, and the moving disk (113) is slidably sealed with the inner wall of the second tube (1112); a heat-expanding material is provided inside the first tube (1111); a moving rod (114) is fixedly provided above the moving disk (113), and the other end of the moving rod (114) passes through the top wall of the second tube (1112); a sensing element (115) is fixedly provided at one end of the moving rod (114) located outside the second tube (1112); the sensing element (115) is located above the sensing element (125) and is coaxially arranged.

7. A safety fault detection device for an oil-immersed transformer as claimed in claim 6, characterized in that: The material of the first tube (1111) is set to be a heat-conducting material, the inner diameter of the first tube (1111) is larger than the inner diameter of the second tube (1112), and the first sensing element (125) sends a signal to the central control module (5) when it contacts the second sensing element (115).

8. A safety fault detection device for an oil-immersed transformer as claimed in claim 7, characterized in that: The heat-expanding material inside the tube 1 (1111) is configured as mercury.

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