Large pumped storage transformer oil cooling circulation monitoring device

Abstract

The utility model discloses a large pumped storage transformer oil cooling circulation monitoring device which comprises a cooling oil inlet and a cooling oil outlet which are arranged on a main transformer, the cooling oil inlet and the cooling oil outlet are mutually connected through a circulating pipe (1), and an oil pump (2), an on-line monitoring device (3) and a cooling mechanism are sequentially connected to the circulating pipe (1). The on-line monitoring device (3) is used for performing oil chromatographic analysis on the cooling oil; the cooling mechanism comprises a plurality of coolers which are arranged side by side, a water cooling assembly is arranged outside each cooler, a main return pipe (4) is connected to the outside of each cooler, and a three-way electric control reversing valve (5) is arranged at the joint of each cooler and the main return pipe (4). According to the utility model, the energy consumption of the cooling mechanism can be reduced while the cooling effect on the cooling oil of the main transformer is ensured.

Description

Technical Field

[0001] The utility model relates to a transformer monitoring device, in particular to an oil cooling cycle monitoring device for a large-scale pumped storage transformer. Background Art

[0002] Because the cooling oil in the main transformer of a pumped-storage power station continuously heats up during operation, manufacturers need to circulate and cool the cooling oil to keep it within a preset temperature range. Currently, manufacturers install a temperature sensor on the main transformer to monitor the current temperature of the cooling oil. When the temperature exceeds a threshold, the cooling oil is pumped out and sent to a cooling mechanism, which rapidly cools the oil before re-sending it to the main transformer, thus achieving its circulating cooling function.

[0003] However, this cooling method has the drawback that, when the cooling mechanism is activated, the cooling oil in the main transformer cools down rapidly, while when it is deactivated, the cooling oil reaches a temperature threshold, causing the operating temperature of the cooling oil to fluctuate within the threshold range, thereby affecting the operating stability of the main transformer. Furthermore, because the cooling oil heats up at different rates when the main transformer is in different operating conditions, manufacturers must use high-power cooling mechanisms to ensure rapid cooling of the cooling oil under specific operating conditions, thereby increasing the cooling mechanism's power consumption during operation. Furthermore, if the cooling mechanism were to continuously cool the cooling oil during the main transformer operation, it would result in overcooling of the cooling oil and a significant increase in energy consumption, thus failing to meet the manufacturer's economic needs.

[0004] Therefore, the existing cooling method for the cooling oil of the main transformer has the problems of poor cooling effect and high energy consumption. Utility Model Content

[0005] The purpose of the utility model is to provide a large-scale pumped storage transformer oil cooling cycle monitoring device, which can reduce the energy consumption of the cooling mechanism while ensuring the cooling effect of the main transformer cooling oil.

[0006] The technical solution of the utility model is as follows: a large-scale pumped storage transformer oil cooling circulation monitoring device comprises a cooling oil inlet and a cooling oil outlet arranged on a main transformer, the cooling oil inlet and the cooling oil outlet are interconnected via a circulation pipe, an oil pump, an online monitoring device and a cooling mechanism are sequentially connected to the circulation pipe, and the online monitoring device is used to perform oil chromatography analysis on the cooling oil; the cooling mechanism comprises a plurality of coolers arranged side by side, each cooler is provided with a water cooling assembly on the outside, the plurality of coolers are connected to a main return pipe on the outside, and a three-way electrically controlled reversing valve is provided at the connection between each cooler and the main return pipe.

[0007] In the aforementioned large-scale pumped storage transformer oil cooling cycle monitoring device, the cooler includes a main cooler, an auxiliary cooler and a standby cooler. The main cooler is used to cool the cooling oil during the operation of the main transformer. The auxiliary cooler is used to turn on after the cooling oil reaches a temperature threshold and cool the cooling oil together with the main cooler; the standby cooler is used to turn on and cool the cooling oil when any one of the main cooler and the auxiliary cooler fails.

[0008] In the aforementioned large-scale pumped storage transformer oil cooling cycle monitoring device, there are multiple auxiliary coolers, and each auxiliary cooler is turned on and cools the cooling oil after the cooling oil reaches a different temperature threshold.

[0009] In the aforementioned large-scale pumped storage transformer oil cooling cycle monitoring device, the cooling mechanism includes a box body, which is provided with a plurality of cooling chambers separated from each other. Each cooling chamber is provided with a cooler, and the end of the cooler extends to the outside of the box body and is connected to the main return pipe.

[0010] In the aforementioned large-scale pumped-storage transformer oil cooling cycle monitoring device, the cooler is a U-shaped tube or an S-shaped tube, and the two ends of the cooler are connected to the main return pipe through a three-way electrically controlled reversing valve. The water cooling component is a spray pipe located in the cooling chamber, and a plurality of nozzles are distributed at intervals on the spray pipe. The outside of the spray pipe extends to the outside of the box and is connected to the spray mechanism. The spray pipe is used to spray cooling water onto the surface of the U-shaped tube to achieve cooling.

[0011] In the aforementioned large-scale pumped storage transformer oil cooling cycle monitoring device, a cooling water outlet pipe is provided at the bottom of the cooling chamber, and a liquid flow meter is provided on the cooling water outlet pipe. The liquid flow meter is used to detect the water output after any water cooling component is turned on.

[0012] Compared with the prior art, the present invention has the following features:

[0013] (1) The present invention defines the structure of the cooling mechanism so that the device can control the number of coolers opened according to the temperature of the cooling oil of the main transformer, thereby effectively reducing the overall energy consumption of the cooling mechanism while ensuring the cooling effect of the cooling oil, and is suitable for different main transformer working conditions;

[0014] (2) By dividing the cooler into a main cooler, an auxiliary cooler and a standby cooler, the main cooler can continuously cool the cooling oil when the main transformer is working, thereby alleviating the temperature rise of the cooling oil under normal working conditions, avoiding the fluctuation of the cooling oil within the temperature threshold range, and improving its working stability; by setting up a standby cooler, it can also replace any cooler to cool the cooling oil when a failure occurs, thereby further improving the stability of the utility model;

[0015] (3) On the basis of the above, the present invention also specifically defines the structure of the cooling mechanism and the water cooling component so that it can achieve the above cooling effect; through the structural definition of the spray mechanism, the cooling water outlet pipe and the circulating water pool, it is possible to achieve static cooling and circulating spraying of the cooling water, thereby ensuring the water cooling effect of the cooling oil of the present invention;

[0016] Therefore, the utility model can reduce the energy consumption of the cooling mechanism while ensuring the cooling effect of the cooling oil of the main transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of Example 1;

[0018] Figure 2 is a schematic structural diagram of Example 2;

[0019] Figure 3 This is a schematic diagram of the connection between the cooling mechanism, the spraying mechanism and the circulating water pool in Example 2.

[0020] The markings in the accompanying drawings are: 1-circulation pipe, 2-oil pump, 3-online monitoring device, 4-main return pipe, 5-three-way electric control reversing valve, 6-main cooler, 7-auxiliary cooler, 8-standby cooler, 9-box, 10-cooling chamber, 11-spray pipe, 12-spray mechanism, 13-cooling water outlet pipe, 14-circulating water tank. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0022] Example 1. A large pumped storage transformer oil cooling cycle monitoring device, comprising: Figure 1 As shown, it includes a cooling oil inlet and a cooling oil outlet provided on the main transformer, the cooling oil inlet and the cooling oil outlet are interconnected via a circulation pipe 1, the circulation pipe 1 is sequentially connected to an oil pump 2, an online monitoring device 3 and a cooling mechanism, the online monitoring device 3 is used to perform oil chromatography analysis on the cooling oil; the cooling mechanism includes a plurality of coolers arranged side by side, each cooler is a conventional cooler for cooling oil of the main transformer, and the cooling efficiency and energy consumption of different coolers are different from each other; the outsides of the plurality of coolers are all connected to a main return pipe 4, and a three-way electrically controlled reversing valve 5 is provided at the connection between each cooler and the main return pipe 4.

[0023] The cooler includes a main cooler 6, an auxiliary cooler 7 and a standby cooler 8. The main cooler 6 is used to cool the cooling oil during the operation of the main transformer. The auxiliary cooler 7 is used to start after the cooling oil reaches a temperature threshold and cool the cooling oil together with the main cooler 6; the standby cooler 8 is used to start and cool the cooling oil when either the main cooler 6 or the auxiliary cooler 7 fails.

[0024] An oil temperature sensor is provided in the main transformer, and the cooler is turned on or off according to monitoring data of the oil temperature sensor.

[0025] There are two auxiliary coolers 7, one of which is turned on when the cooling oil reaches 55°C, and cools the cooling oil together with the main cooler 6; the other auxiliary cooler 7 is turned on when the cooling oil reaches 65°C, and cools the cooling oil together with the main cooler 6 and the previous auxiliary cooler 7.

[0026] Working Principle of the Utility Model: During use, the oil pump 2 and circulation pipe 1 work together to pump cooling oil from the main transformer and deliver it sequentially to the online monitoring device 3 and the main return pipe 4. The online monitoring device 3 then performs oil chromatography on the cooling oil, determining whether the main transformer is faulty based on the dissolved gas components and content in the cooling oil. After exiting the online monitoring device 3, the cooling oil enters the main cooler 6, where it is cooled. After exiting the main cooler 6, the cooling oil returns directly to the circulation pipe 1 through the main return pipe 4 and flows back into the main transformer, thus achieving continuous circulation and cooling of the cooling oil.

[0027] When the cooling oil is still in a temperature-raising state and reaches 55°C due to the cooling effect of the main cooler 6, one of the auxiliary coolers 7 is turned on and the cooling oil passes through the main cooler 6 and the auxiliary cooler 7 in sequence during the cooling cycle, thereby improving the cooling effect on the cooling oil and preventing further temperature rise of the cooling oil. Similarly, when the cooling oil is still in a temperature-raising state and reaches 65°C in this state, another auxiliary cooler 7 is turned on, thereby using three groups of coolers to cool the cooling oil in sequence, further improving the cooling effect on the cooling oil and ensuring the operating stability of the main transformer. If the main cooler 6 or any of the auxiliary coolers 7 fails, the three-way electrically controlled reversing valve 5 is used to close the cooler and then open the backup cooler 8, thereby using the backup cooler 8 to cool the cooling oil instead of the main cooler, thus ensuring the cooling stability of the cooling oil and leaving sufficient time for the manufacturer to repair.

[0028] Example 2. A large pumped storage transformer oil cooling cycle monitoring device, comprising: Figure 2-3As shown, it includes a cooling oil inlet and a cooling oil outlet arranged on the main transformer. The cooling oil inlet and the cooling oil outlet are interconnected through a circulation pipe 1. The circulation pipe 1 is sequentially connected to an oil pump 2, an online monitoring device 3 and a cooling mechanism. The online monitoring device 3 is used to perform oil chromatography analysis on the cooling oil; the cooling mechanism includes a plurality of coolers arranged side by side, each cooler is provided with a water cooling component on the outside, and the outsides of the plurality of coolers are connected to a main return pipe 4. A three-way electrically controlled reversing valve 5 is provided at the connection between each cooler and the main return pipe 4.

[0029] The cooler includes a main cooler 6, an auxiliary cooler 7 and a standby cooler 8. The main cooler 6 is used to cool the cooling oil during the operation of the main transformer. The auxiliary cooler 7 is used to start after the cooling oil reaches a temperature threshold and cool the cooling oil together with the main cooler 6; the standby cooler 8 is used to start and cool the cooling oil when either the main cooler 6 or the auxiliary cooler 7 fails.

[0030] An oil temperature sensor is provided in the main transformer, and the cooler is turned on or off according to monitoring data of the oil temperature sensor.

[0031] There are multiple auxiliary coolers 7 , and each auxiliary cooler 7 is turned on and cools down the cooling oil after the cooling oil reaches a different temperature threshold.

[0032] The cooling mechanism includes a box body 9 , in which a plurality of mutually separated cooling chambers 10 are provided. Each cooling chamber 10 is provided with a cooler, and the end of the cooler extends to the outside of the box body 9 and is connected to the main return pipe 4 .

[0033] The cooler is a U-shaped tube or an S-shaped tube, and both ends of the cooler are connected to the main return pipe 4 through a three-way electrically controlled reversing valve 5. The water cooling component is a spray pipe 11 located in the cooling chamber 10. A plurality of nozzles are distributed at intervals on the spray pipe 11. The outside of the spray pipe 11 extends to the outside of the box 9 and is connected to the spray mechanism 12. The spray pipe 11 is used to spray cooling water onto the surface of the U-shaped tube to achieve cooling.

[0034] A cooling water outlet pipe 13 is provided at the bottom of the cooling chamber 10, and a liquid flow meter is provided on the cooling water outlet pipe 13. The liquid flow meter is used to detect the water output of any water-cooling component after it is turned on. When the water output of the water-cooling component is lower than the threshold, it indicates that the cooler has failed, and then the cooler is turned off and the standby cooler 8 is turned on.

[0035] The outside of the cooling water outlet pipe 13 is connected to a circulating water pool 14 . The cooling water is discharged through the cooling water outlet pipe 13 and enters the circulating water pool 14 . The spray mechanism 12 extracts the cooling water from the bottom of the circulating water pool 14 .

[0036] Compared to Example 1, this embodiment further refines the structure of the cooling mechanism and water-cooling assembly, enabling cooling oil to flow into the cooler. This allows an external spray mechanism 12 to spray cooling water onto the cooler surface, exchanging heat with the cooling oil inside and achieving a cooling effect. After spraying, the cooling water then flows to the bottom of the cooling chamber 10, where it is collected by a cooling water outlet pipe 13 and uniformly flows into a circulating water tank 14. The cooling water outlet pipe 13 on the cooling water outlet pipe 13 monitors the spray rate of the spray mechanism 12. If a malfunction occurs, the cooler is shut down and the backup cooler 8 is activated, thereby achieving a switching function.

Claims

1. A large pumped storage transformer oil cooling cycle monitoring device, characterized by: The invention comprises a cooling oil inlet and a cooling oil outlet arranged on a main transformer, wherein the cooling oil inlet and the cooling oil outlet are connected to each other via a circulation pipe (1), and the circulation pipe (1) is sequentially connected to an oil pump (2), an online monitoring device (3) and a cooling mechanism, wherein the online monitoring device (3) is used to perform oil chromatography analysis on the cooling oil; the cooling mechanism comprises a plurality of coolers arranged side by side, each cooler being provided with a water cooling assembly on the outside, the plurality of coolers being connected to a main return pipe (4) on the outside, and a three-way electrically controlled reversing valve (5) being provided at the connection between each cooler and the main return pipe (4).

2. A large-scale pumped storage transformer oil cooling cycle monitoring device according to claim 1, characterized in that: The cooler comprises a main cooler (6), an auxiliary cooler (7) and a standby cooler (8); the main cooler (6) is used to cool the cooling oil during the operation of the main transformer; the auxiliary cooler (7) is used to start after the cooling oil reaches a temperature threshold and cool the cooling oil together with the main cooler (6); and the standby cooler (8) is used to start and cool the cooling oil when any one of the main cooler (6) and the auxiliary cooler (7) fails.

3. A large-scale pumped storage transformer oil cooling cycle monitoring device according to claim 2, characterized in that: There are multiple auxiliary coolers (7), and each auxiliary cooler (7) is turned on and cools the cooling oil after the cooling oil reaches a different temperature threshold.

4. A large-scale pumped storage transformer oil cooling cycle monitoring device according to claim 1, characterized in that: The cooling mechanism comprises a box (9), wherein a plurality of mutually separated cooling chambers (10) are provided in the box (9), and each cooling chamber (10) is provided with a cooler, the end of the cooler extending to the outside of the box (9) and connected to the main return pipe (4).

5. A large-scale pumped storage transformer oil cooling cycle monitoring device according to claim 4, characterized in that: The cooler is a U-shaped tube or an S-shaped tube, and both ends of the cooler are connected to the main return pipe (4) via a three-way electrically controlled reversing valve (5). The water cooling component is a spray pipe (11) located in the cooling chamber (10), and a plurality of nozzles are distributed at intervals on the spray pipe (11). The outside of the spray pipe (11) extends to the outside of the box (9) and is connected to a spray mechanism (12). The spray pipe (11) is used to spray cooling water onto the surface of the U-shaped tube to achieve cooling.

6. A large-scale pumped storage transformer oil cooling cycle monitoring device according to claim 5, characterized in that: A cooling water outlet pipe (13) is provided at the bottom of the cooling chamber (10), and a liquid flow meter is provided on the cooling water outlet pipe (13). The liquid flow meter is used to detect the water output of any water cooling component after it is turned on.

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