Floor type oil storage device used in power transformation system

Abstract

The invention relates to oil storage compensation equipment in the power transformation industry, in particular to a floor type oil storage device for a power transformation system, which is characterized in that an oil storage cabinet and a pressure balancing device are arranged on the ground, transformer insulating oil is filled in the oil storage cabinet, and pressure medium oil is filled in the pressure balancing device; the transformer insulating oil pipeline system communicates the lower portion of the oil conservator with the upper portion of the transformer, and the pressure medium oil connecting pipe communicates the upper portion of the oil conservator with the lower portion of the pressure balancing device. The transformer oil conservator can be arranged on the ground, does not occupy the upper space of the transformer oil tank, does not affect arrangement of other parts, has a pressure compensation function, can offset the siphon effect on the transformer oil tank after the position of the oil conservator is lowered, and avoids negative pressure generated in the transformer oil tank; the device can be arranged in a centralized manner and used by multiple transformers at the same time, is convenient to monitor, maintain and overhaul, does not need climbing operation, and saves manpower and material resources.

Description

Technical Field

[0001] The present invention relates to an oil storage compensation device in the power transformation industry, and more specifically to a floor-mounted oil storage device for a power transformation system. Background Art

[0002] In a power transformation system, transformers can be classified into dry-type transformers and oil-immersed transformers according to different insulating media. When an oil-immersed transformer is in operation, heat is dissipated inside it, causing the temperature of the transformer oil in the oil tank to rise. Since the transformer oil is a liquid, it has the phenomenon of thermal expansion and contraction. If the periphery of the oil tank is completely enclosed, the pressure inside the oil tank will increase after the transformer oil expands due to temperature rise, resulting in deformation, damage, or even explosion of the oil tank. Therefore, a volume compensation device needs to be set for the oil tank, which can press the excess oil into the compensation device when the internal pressure of the oil tank becomes large to release the pressure; conversely, when the pressure drops, the oil in the compensation device is sucked back. In this way, no large deformation will occur in the oil tank regardless of temperature changes. The conventional design scheme is to install an oil conservator on the upper part of the transformer oil tank, which is connected to the transformer oil tank through a pipeline. The oil conservator of the transformer has two functions. One is to provide space for the thermal expansion and contraction of the transformer oil in the transformer oil tank; the other is to separate the transformer oil from the external atmosphere to prevent the transformer oil from contacting water vapor and oxygen in the air and causing aging and deterioration. Currently, the following technical deficiencies exist in all oil conservators on the market:

[0003] 1. The oil conservator is generally installed on the top of the transformer oil tank. However, since there are also many pipelines and components arranged on the top of the transformer oil tank, the space occupied by the oil conservator will affect the arrangement of other components and the insulation distance from other electrical components. If the size of the oil conservator is too large, there is currently another solution, which is to set up a bracket on the ground near the transformer, with a height higher than that of the transformer oil tank, and then place the oil conservator on the bracket and connect it to the transformer oil tank through a pipeline. Although this solution solves the problem of the oil conservator occupying the space on the top of the transformer, due to the addition of the bracket, it occupies additional building space and the cost is too high.

[0004] 2. The weight of the oil conservator (which can reach more than ten tons in the case of a heavy one) will cause stress concentration near the support points of the transformer oil tank cover, affecting the overall stress condition of the transformer. In order for the oil tank to bear the gravity of the oil conservator, a high-strength bracket that meets the full-load condition of the oil conservator needs to be designed, which puts forward high requirements for the design of the oil tank structure and the bracket, increasing the material cost and manufacturing difficulty.

[0005] 3. A substation requires multiple transformers, and each transformer needs to be equipped with an oil conservator. During equipment operation, personnel need to be arranged to conduct regular inspections to observe the oil level of each oil conservator to judge the overall operation condition of the transformer. Each oil conservator is scattered and cannot be monitored centrally, and it is not easy to detect abnormalities in a single oil conservator in a timely manner.

[0006] 4. During the daily maintenance and overhaul of the equipment, since the oil conservator is placed on the upper part of the transformer oil tank, it requires operators to work at heights and corresponding climbing and hoisting equipment needs to be equipped, which increases the complexity of the maintenance and overhaul work. At the same time, during the operation, it is necessary to cut off the power supply of the lower transformer, and the power cut will affect the surrounding production and life, and the power supply bureau needs to submit a report for approval.

[0007] Due to the above various deficiencies in the prior art, transformer users are very eager to move the oil storage device to the ground. So far, there is no feasible example in the industry that can successfully relocate the oil storage device to the ground. The invention patent with the publication number CN102024549A, which was published on April 20, 2011, discloses a "ground-mounted oil conservator", which is a solution to place the oil conservator at a position lower than the transformer oil tank cover, but this solution has technical defects. When the oil conservator is placed at a position lower than the transformer oil tank cover, due to the height difference, the transformer oil will form a huge pressure on the lower-positioned oil conservator. At the same time, due to the siphon effect, this solution will cause a negative pressure inside the transformer, that is, the internal pressure of the transformer is less than the external atmospheric pressure. This phenomenon will make it easy for oxygen or moisture in the atmosphere to enter the transformer, affecting the normal operation of the transformer. Summary of the Invention

[0008] In order to solve the problem of placing the oil storage device on the ground, the purpose of the present invention is to provide a ground-mounted oil storage device for a power transformation system.

[0009] The purpose of the present invention is achieved by the following technical solutions:

[0010] The present invention includes an oil conservator, a pressure balancing device, a pressure medium oil connecting pipe, and a transformer insulating oil pipeline system. The oil conservator and the pressure balancing device are both arranged on the ground. The oil conservator includes a cylinder body, a corrugated core, and a base A. The cylinder body is installed on the ground through the base A. The corrugated core is located inside the cylinder body, and the lower part of the corrugated core is fixedly connected to the cylinder body. The upper part of the cylinder body is connected to the lower part of the pressure balancing device through the pressure medium oil connecting pipe. The upper part of the cylinder body is respectively provided with an oil conservator exhaust pipe and a cylinder body exhaust pipe. One end of the oil conservator exhaust pipe is communicated with the atmosphere, and the other end is communicated with the inner cavity of the corrugated core. One end of the cylinder body exhaust pipe is communicated with the atmosphere, and the other end is communicated with the inner cavity of the cylinder body. The lower part of the cylinder body is provided with an oil conservator connecting pipe. One end of the oil conservator connecting pipe is communicated with the inner cavity of the corrugated core, and the other end is connected to the upper part of the transformer through the transformer insulating oil pipeline system. The inner cavity of the corrugated core is filled with transformer insulating oil. The pressure balancing device includes a housing, a base B, and an adjustable high-pressure air pump. The housing is installed on the ground through the base B. The inside of the housing is divided into a pressure release air chamber, a pressure medium oil chamber, an air pump chamber, and a pressurizing air chamber that are independently sealed from each other. The pressure medium oil chamber is filled with pressure medium oil, and the lower part of the pressure medium oil chamber is connected to the upper part of the cylinder body through the pressure medium oil connecting pipe. An adjustable high-pressure air pump for injecting high-pressure air into the pressurizing air chamber is installed in the air pump chamber. The pressure medium oil chamber is respectively connected to the pressure release air chamber and the pressurizing air chamber through a one-way pressure regulating valve A and a one-way pressure regulating valve B. The pressure release air chamber is communicated with the atmosphere through a pressure release valve.

[0011] Wherein: The upper part of the cylinder body is provided with a pressure balancing pipeline interface. One end of the pressure balancing pipeline interface is communicated with the inner cavity of the cylinder body, and the other end of the pressure balancing pipeline interface is provided with a butterfly valve A for communicating with the pressure medium oil connecting pipe.

[0012] The upper part of the corrugated core is respectively provided with a limiting column and guide wheels. There are multiple guide wheels, which are evenly distributed along the circumferential direction of the upper part of the corrugated core. Each guide wheel rolls along the inner wall of the cylinder body when the corrugated core expands or contracts. The limiting column is located inside each guide wheel and is used to limit the expansion of the corrugated core.

[0013] An oil conservator liquid level gauge and a pressure medium oil injection pipe are respectively installed on the side wall of the cylinder body. The oil conservator liquid level gauge is arranged at a position close to the upper part of the cylinder body and is used to display the real-time height of the expansion of the corrugated core. The pressure medium oil injection pipe is arranged at a position close to the lower part of the cylinder body, and pressure medium oil is injected into the space between the inside of the cylinder body and the outside of the corrugated core through the pressure medium oil injection pipe. The corrugated core separates the transformer insulating oil from the pressure medium oil. A transformer insulating oil injection pipe and a pressure gauge A are respectively provided on the oil conservator connecting pipe.

[0014] The air pump chamber, the pressurized air chamber, and the pressure release air chamber are all located above the pressure medium oil chamber. The high-pressure air from the adjustable high-pressure air pump to the pressurized air chamber enters the pressure medium oil chamber through the one-way pressure regulating valve B. The high-pressure air with excessive internal pressure in the pressure medium oil chamber enters the pressure release air chamber through the one-way pressure regulating valve A and is then depressurized through the pressure release valve.

[0015] A pressure medium oil interface for communicating with the pressure medium oil connecting pipe is provided at the lower part of the housing. An oil injection pipe for injecting pressure medium oil into the inner cavity of the housing is provided at a position near the lower part of the housing.

[0016] A maintenance flange is provided at the upper part of the housing. The maintenance flange is located between the pressurized air chamber and the pressure release air chamber and is used for the inspection and maintenance of the pressurized air chamber and the pressure release air chamber. An air pump maintenance window is opened on the housing corresponding to the air pump chamber.

[0017] A communicating pipe type oil level gauge and a pressure gauge B are respectively installed on the side surface of the housing corresponding to the pressure medium oil chamber. The communicating pipe type oil level gauge is used to display the oil level in the pressure medium oil chamber, and the pressure gauge B is used to display the air pressure in the pressure medium oil chamber. A control cabinet is fixedly connected to the side surface of the housing. The control cabinet is connected to the adjustable high-pressure air pump and is used to control the operation of the adjustable high-pressure air pump.

[0018] The transformer insulating oil pipeline system includes a transformer and oil conservator connecting pipe, a butterfly valve B, an exhaust valve, a butterfly valve C, a gas relay, and a working pressure gauge. The upper part of the transformer is connected to the oil conservator through the transformer and oil conservator connecting pipe. The butterfly valve B and the butterfly valve C are respectively provided on the transformer and oil conservator connecting pipe. The gas relay and the working pressure gauge are located on the pipeline between the transformer and the butterfly valve C. The exhaust valve is located on the pipeline between the butterfly valve B and the butterfly valve C.

[0019] One or more oil conservators are provided. When there are multiple oil conservators, they are interconnected through the oil conservator connecting pipes at the lower parts of the oil conservators. At the same time, the upper parts of the oil conservators are respectively connected to the pressure balancing device, that is, one pressure balancing device provides pressure medium oil for multiple oil conservators at the same time.

[0020] The advantages and positive effects of the present invention are as follows:

[0021] 1. The present invention can replace the traditional oil conservator to realize the storage and compensation of transformer oil. The present invention can be arranged on the ground, does not occupy the space above the transformer oil tank, does not affect the arrangement of other components, and at the same time reduces the weight pressure on the transformer oil tank, enabling the design of the oil tank to be more lightweight.

[0022] 2. The present invention has a pressure compensation function, which can offset the siphon effect formed on the transformer oil tank due to the lowering of the position of the conservator, avoid the generation of negative pressure inside the transformer oil tank, and does not affect its normal operation.

[0023] 3. The present invention can be centrally arranged and used by multiple transformers simultaneously, facilitating monitoring, maintenance and repair, without the need for climbing operations, saving manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall layout of the present invention and the transformer;

[0025] Figure 2 is a structural sectional view of the conservator of the present invention;

[0026] Figure 3 is a structural sectional view of the pressure balance device of the present invention;

[0027] Figure 4 is a schematic diagram of the structure of the transformer insulating oil pipeline system of the present invention;

[0028] Wherein: 1 is the conservator, 101 is the cylinder body, 102 is the conservator liquid level gauge, 103 is the conservator exhaust pipe, 104 is the corrugated core, 105 is the pressure medium oil injection pipe, 106 is the base A, 107 is the conservator connecting pipe, 108 is the transformer insulating oil injection pipe, 109 is the pressure gauge A, 110 is the limit post, 111 is the guide wheel, 112 is the cylinder body exhaust pipe, 113 is the pressure balance pipeline interface, 114 is the butterfly valve A, 115 is the transformer insulating oil;

[0029] 2 is the pressure balance device, 201 is the maintenance flange, 202 is the pressure release air chamber, 203 is the pressure release valve, 204 is the one-way pressure regulating valve A, 205 is the one-way pressure regulating valve B, 206 is the outer shell, 207 is the communicating pipe type oil level gauge, 208 is the injection pipe, 209 is the pressure medium oil interface, 210 is the pressure medium oil chamber, 211 is the base B, 212 is the control cabinet, 213 is the pressure gauge B, 214 is the air pump chamber, 215 is the adjustable high-pressure air pump, 216 is the air pump maintenance window, 217 is the pressurizing air chamber, 218 is the pressure medium oil;

[0030] 3 is the pressure medium oil connecting pipe;

[0031] 4 is the transformer insulating oil pipeline system, 401 is the transformer and conservator connecting pipe, 402 is the butterfly valve B, 403 is the exhaust valve, 404 is the butterfly valve C, 405 is the gas relay, 406 is the working pressure gauge;

[0032] 5 is the transformer. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] As Figure 1 shown, the present invention includes an oil conservator 1, a pressure balancing device 2, a pressure medium oil connecting pipe 3, and a transformer insulating oil pipeline system 4. The oil conservator 1 and the pressure balancing device 2 are both arranged on the ground. The oil conservator 1 contains transformer insulating oil 115 inside, and the pressure balancing device 2 contains pressure medium oil 218 inside. The lower part of the oil conservator 1 is connected to the upper part of the transformer 5 through the transformer insulating oil pipeline system 4, and the upper part of the oil conservator 1 is connected to the lower part of the pressure balancing device 2 through the pressure medium oil connecting pipe 3.

[0035] As Figure 1 and Figure 2 shown, the oil conservator 1 of this embodiment includes a cylinder body 101, a corrugated core 104, and a base A106. The base 106 is installed on the ground, the cylinder body 101 is fixed on the base 106, the corrugated core 104 is located inside the cylinder body 101, and the lower part of the corrugated core 104 is fixedly connected to the cylinder body 101. The upper part of the cylinder body 101 is respectively provided with an oil conservator exhaust pipe 103, a cylinder body exhaust pipe 112, and a pressure balancing pipeline interface 113. One end of the oil conservator exhaust pipe 103 is communicated with the atmosphere, and the other end passes through the upper part of the cylinder body 101 and is connected to the inner cavity of the corrugated core 104. One end of the cylinder body exhaust pipe 112 is communicated with the atmosphere, and the other end is connected to the inner cavity of the cylinder body 101. One end of the pressure balancing pipeline interface 113 is communicated with the inner cavity of the cylinder body 101, and a butterfly valve A114 is provided at the other end of the pressure balancing pipeline interface 113 for communicating with the pressure medium oil connecting pipe 3. The upper part of the cylinder body 101 is connected to the lower part of the pressure balancing device 2 through the pressure medium oil connecting pipe 3. Valves for controlling the pipeline switch are respectively provided on the oil conservator exhaust pipe 103 and the cylinder body exhaust pipe 112 of this embodiment. A connecting pipe 107 of the oil conservator is provided at the lower part of the cylinder body 101. One end of the connecting pipe 107 of the oil conservator is communicated with the inner cavity of the corrugated core 104, and the other end is connected to the upper part of the transformer 5 through the transformer insulating oil pipeline system 4. A transformer insulating oil injection pipe 108 and a pressure gauge A109 are installed on the connecting pipe 107 of the oil conservator.

[0036] In this embodiment, a limiting post 110 and guide wheels 111 are respectively provided on the upper part of the corrugated core 104. There are multiple guide wheels 111, which are evenly distributed along the circumferential direction of the upper part of the corrugated core 104. Each guide wheel 111 rolls along the inner wall of the cylinder body 101 when the corrugated core 104 expands or contracts. The limiting post 110 is located inside each guide wheel 111 for restricting the expansion of the corrugated core 104.

[0037] On the side wall of the cylinder body 101 of this embodiment, an oil conservator level gauge 102 and a pressure medium oil injection pipe 105 are respectively installed. The pressure medium oil injection pipe 105 is arranged at the lower part of the side wall of the cylinder body 101, and the oil conservator level gauge 102 is arranged near the upper part of the cylinder body 101, and is used to display the real-time height of the expansion of the corrugated core 104. The inner cavity of the corrugated core 104 is filled with transformer insulating oil 115, and pressure medium oil 218 is injected into the space between the inside of the cylinder body 101 and the outside of the corrugated core 104 through the pressure medium oil injection pipe 105. The corrugated core 104 separates the transformer insulating oil 115 from the pressure medium oil 218 and they do not contact each other.

[0038] The pressure balancing device 2 of this embodiment includes a housing 206, a base B211 and an adjustable high-pressure air pump 215. The base 211 is arranged on the ground, and the housing 206 is installed on the base 211. The interior of the housing 206 is divided into four mutually independent sealed spaces: a pressure release air chamber 202, a pressure medium oil chamber 210, an air pump chamber 214 and a pressurizing air chamber 217. The pressure medium oil chamber 210 is filled with pressure medium oil 218. A pressure medium oil interface 209 for connecting a pressure medium oil connecting pipe 3 is provided at the lower part of the pressure medium oil chamber 210. The pressure medium oil interface 209 is connected to the upper part of the cylinder body 101 through the pressure medium oil connecting pipe 3. The air pump chamber 214 is located at the leftmost side of the upper part of the pressure medium oil chamber 210, and an adjustable high-pressure air pump 215 is installed inside. An air pump maintenance window 216 is opened on the housing 206 corresponding to the air pump chamber 214. The adjustable high-pressure air pump 215 can inject high-pressure air into the pressurizing air chamber 217. The pressure medium oil chamber 210 is respectively connected to the pressure release air chamber 202 and the pressurizing air chamber 217 through a one-way pressure regulating valve A204 and a one-way pressure regulating valve B205. The pressure release air chamber 202 is communicated with the atmosphere through a pressure release valve 203. The high-pressure air injected by the adjustable high-pressure air pump 215 into the pressurizing air chamber 217 enters the pressure medium oil chamber 210 through the one-way pressure regulating valve B205. When the pressure of the high-pressure gas inside the pressure medium oil chamber 210 is too high, the high-pressure air enters the pressure release air chamber 202 through the one-way pressure regulating valve A204 and is then depressurized through the pressure release valve 203. The pressure of the high-pressure air in this embodiment is determined by the height difference between the upper part of the transformer 5 and the oil conservator 1. According to different models of the transformer 5, the height difference is 3 to 10 meters, and the pressure of the high-pressure air injected by the adjustable high-pressure air pump 215 into the pressurizing air chamber 217 is 0.5 to 2 atmospheres.

[0039] In the upper part of the housing 206 of this embodiment, a maintenance flange 201 is provided. The maintenance flange 201 is located between the pressure release air chamber 202 and the pressurizing air chamber 217, and is used for the inspection and maintenance of the pressurizing air chamber 217 and the pressure release air chamber 202. On the side surface of the housing 206 corresponding to the pressure medium oil chamber 210, a communicating tube type oil level gauge 207, a pressure gauge B213 and an oil injection tube 208 are respectively installed. The communicating tube type oil level gauge 207 is used to display the oil level in the pressure medium oil chamber 210, and the pressure gauge B213 is used to display the air pressure in the pressure medium oil chamber 210. The control cabinet 212 is fixed on the side surface of the housing 206, and the control cabinet 212 is connected to the adjustable high-pressure air pump 215 for controlling the operation of the adjustable high-pressure air pump 215. The oil injection tube 208 is arranged at a position near the lower part of the housing 206 and is used for injecting the pressure medium oil 218 into the inner cavity of the housing 206.

[0040] The transformer insulating oil pipeline system 4 of this embodiment includes a transformer and conservator connecting pipe 401, a butterfly valve B402, an exhaust valve 403, a butterfly valve C404, a gas relay 405 and a working pressure gauge 406. The upper part of the transformer 5 is connected to the conservator through the transformer and conservator connecting pipe 401 and the conservator connecting pipe 107. The butterfly valve B402 and the butterfly valve C404 are respectively arranged on the transformer and conservator connecting pipe 401. The gas relay 405 and the working pressure gauge 406 are located on the pipeline between the transformer 5 and the butterfly valve C404, and the exhaust valve 403 is located on the pipeline between the butterfly valve B402 and the butterfly valve C404.

[0041] One or more conservators 1 can be provided in this embodiment. When there are multiple conservators 1, they are interconnected through the conservator connecting pipes 107 at the lower parts of the conservators 1. At the same time, the pressure balance pipeline interfaces 113 at the upper parts of the conservators 1 are respectively connected to the pressure balance device 2, that is, one pressure balance device 2 provides the pressure medium oil 218 for multiple conservators 1 at the same time.

[0042] The working principle of the present invention is:

[0043] After all components of the present invention are connected and installed to the transformer 5, open the butterfly valve B402 and the butterfly valve C404, open the conservator exhaust pipe 103 and the cylinder exhaust pipe 112 in the conservator 1, and then inject transformer insulating oil into the transformer 5 until the transformer insulating oil fills the entire transformer 5 and flows into the corrugated core 104 in the conservator 1 through the transformer insulating oil pipeline system 4; then stop injecting oil into the transformer 5 and instead inject oil from the transformer insulating oil injection pipe 108 until the transformer insulating oil in the corrugated core 104 flows out from the conservator exhaust pipe 103, indicating that the corrugated core 104 is full and the air has been exhausted; at this time, close the conservator exhaust pipe 103, and the partial injection of the transformer insulating oil is completed. Due to the height difference between the lower part of the conservator 1 and the upper part of the transformer 5, at this time, the inside of the corrugated core 104 bears the positive pressure brought by the height of the transformer insulating oil, causing the corrugated core 104 to expand, and the limit post 110 approaches or abuts against the upper cover of the cylinder 101.

[0044] Next, inject the pressure medium oil 218. First, keep the cylinder exhaust pipe 112 in the conservator 1 open, and inject the pressure medium oil 218 into the space between the inside of the cylinder 101 and the outside of the corrugated core 104 from the pressure medium oil injection pipe 105. When the pressure medium oil 218 flows out from the cylinder exhaust pipe 112, close the cylinder exhaust pipe 112; continue to inject the pressure medium oil 218 so that the pressure medium oil 218 sequentially passes through the pressure balance pipeline interface 113, the pressure medium oil connecting pipe 3, and the pressure medium oil interface 209 and enters the pressure medium oil chamber 210 in the pressure balance device 2. After that, to increase the injection speed, the pressure medium oil 218 can be injected simultaneously from the injection pipe 208 until the pressure medium oil 218 fills two-thirds of the volume of the pressure medium oil chamber 210, and the injection of the pressure medium oil 218 ends. At this time, the entire system is ready, the reading of the conservator level gauge 102 in the conservator 1 is at or near the maximum value, the oil level of the communicating type oil level gauge 207 in the pressure balance device 2 is at two-thirds, and the working pressure gauge 406 on the upper part of the transformer 5 should be negative (i.e., lower than the atmospheric pressure).

[0045] After that, perform the inflation operation. Open the control cabinet 212 in the pressure balance device 2, start the adjustable high-pressure air pump 215, and inflate the pressurizing air chamber 217. The high-pressure air enters the pressure medium oil chamber 210 through the one-way pressure regulating valve B205. The air pressure will be converted into the oil pressure of the pressure medium oil 218 and transmitted into the cylinder 101 of the conservator 1, pushing the upper part of the corrugated core 104 to contract. After the corrugated core 104 contracts, the oil pressure of the transformer insulating oil 115 inside it increases, and further causes the reading of the working pressure gauge 406 on the upper part of the transformer 5 to increase. When the reading of the working pressure gauge 406 is 200 Pa, close the adjustable high-pressure air pump 215, and at this time, the inflation is completed. The entire system is in a pressure balance state, and the final pressure on the transformer 5 is a slightly positive pressure of 200 Pa, meeting the requirements of the slightly positive pressure of the transformer.

[0046] After the inflation is completed, the transformer 5 is ready for normal operation. When the transformer 5 is operating normally at the rated power, the reading of the conservator level gauge 102 in the conservator 1 is taken as the rated oil level, and the reading of the pressure gauge B213 in the pressure balance device 2 is taken as the rated balance pressure. For transformers of different heights, their rated oil levels and rated balance pressures are also different. Based on the rated balance pressure, with a fluctuation range of ±10%, the release pressure of the pressure relief valve 203 and the opening pressure of the adjustable high-pressure air pump 215 are respectively set. When the power of the transformer 5 decreases, the heat dissipated during its operation also decreases, the insulating oil of the transformer cools and contracts, and the corrugated core 104 in the conservator 1 also contracts accordingly. Eventually, the pressure in the pressure medium oil chamber 210 of the pressure balance device 2 decreases, and the reading of the pressure gauge B213 drops. When the pressure drops below 90% of the rated balance pressure, the control cabinet 212 starts the adjustable high-pressure air pump 215 to inflate and boost the pressure to maintain system balance. When the power of the transformer 5 increases, the heat dissipated during its operation also increases, the insulating oil of the transformer heats up and expands, and the corrugated core 104 in the conservator 1 also expands accordingly. Eventually, the pressure in the pressure medium oil chamber 210 of the pressure balance device 2 increases, and the reading of the pressure gauge B213 rises. When the pressure rises above 110% of the rated balance pressure, the pressure relief valve 203 opens to exhaust and relieve the pressure to maintain system balance.

Claims

1. A floor-mounted oil storage device for a power transformation system, characterized in that: It includes an oil storage tank (1), a pressure balance device (2), a pressure medium oil connecting pipe (3) and a transformer insulating oil pipeline system (4). The oil storage tank (1) and the pressure balance device (2) are both arranged on the ground. The oil storage tank (1) includes a cylinder body (101), a corrugated core (104) and a base A (106). The cylinder body (101) is installed on the ground through the base A (106). The corrugated core (104) is located inside the cylinder body (101), and the lower part of the corrugated core (104) is fixedly connected to the cylinder body (101). The upper part of the cylinder body (101) is connected to the lower part of the pressure balance device (2) through the pressure medium oil connecting pipe (3). The upper part of the cylinder body (101) is respectively provided with an oil storage tank exhaust pipe (103) and a cylinder body exhaust pipe (112). One end of the oil storage tank exhaust pipe (103) is communicated with the atmosphere, and the other end is communicated with the inner cavity of the corrugated core (104). One end of the cylinder body exhaust pipe (112) is communicated with the atmosphere, and the other end is communicated with the inner cavity of the cylinder body (101). The lower part of the cylinder body (101) is provided with an oil storage tank connecting pipe (107). One end of the oil storage tank connecting pipe (107) is communicated with the inner cavity of the corrugated core (104), and the other end is connected to the upper part of the transformer (5) through the transformer insulating oil pipeline system (4). The inner cavity of the corrugated core (104) is filled with transformer insulating oil (115). The pressure balance device (2) includes a housing (206), a base B (211) and an adjustable high-pressure air pump (215). The housing (206) is installed on the ground through the base B (211). The inside of the housing (206) is divided into a pressure release air chamber (202), a pressure medium oil chamber (210), an air pump chamber (214) and a pressurized air chamber (217) that are independently sealed from each other. The pressure medium oil chamber (210) is filled with pressure medium oil (218), and the lower part of the pressure medium oil chamber (210) is connected to the upper part of the cylinder body (101) through the pressure medium oil connecting pipe (3). An adjustable high-pressure air pump (215) for injecting high-pressure air into the pressurized air chamber (217) is installed in the air pump chamber (214). The pressure medium oil chamber (210) is respectively connected to the pressure release air chamber (202) and the pressurized air chamber (217) through a one-way pressure regulating valve A (204) and a one-way pressure regulating valve B (205). The pressure release air chamber (202) is communicated with the atmosphere through a pressure release valve (203).

2. The floor-mounted oil storage device for a power transformation system according to claim 1, characterized in that: The upper part of the cylinder body (101) is provided with a pressure balance pipeline interface (113). One end of the pressure balance pipeline interface (113) is communicated with the inner cavity of the cylinder body (101), and the other end of the pressure balance pipeline interface (113) is provided with a butterfly valve A (114) for communicating with the pressure medium oil connecting pipe (3).

3. The floor-mounted oil storage device for a power transformation system according to claim 1, It is characterized in that: On the upper part of the corrugated core body (104), a limiting column (110) and guide wheels (111) are respectively arranged. There are multiple guide wheels (111), which are evenly distributed circumferentially along the upper part of the corrugated core body (104). Each guide wheel (111) rolls along the inner wall of the cylinder body (101) when the corrugated core body (104) expands or contracts; the limiting column (110) is located inside each guide wheel (111) and is used to limit the expansion of the corrugated core body (104).

4. The floor-mounted oil storage device for a power transformation system according to claim 1, It is characterized in that: An oil storage tank liquid level gauge (102) and a pressure medium oil injection pipe (105) are respectively installed on the side wall of the cylinder body (101). The oil storage tank liquid level gauge (102) is arranged at a position close to the upper part of the cylinder body (101) and is used to display the real-time height of the expansion of the corrugated core body (104); the pressure medium oil injection pipe (105) is arranged at a position close to the lower part of the cylinder body (101), and pressure medium oil (218) is injected into the space between the inside of the cylinder body (101) and the outside of the corrugated core body (104) through the pressure medium oil injection pipe (105); the corrugated core body (104) separates the transformer insulating oil (115) from the pressure medium oil (218); a transformer insulating oil injection pipe (108) and a pressure gauge A (109) are respectively arranged on the oil storage tank connecting pipe (107).

5. The floor-mounted oil storage device for a power transformation system according to claim 1, It is characterized in that: The air pump chamber (214), the pressurized air chamber (217) and the pressure release air chamber (202) are all located above the pressure medium oil chamber (210). The high-pressure air of the adjustable high-pressure air pump (215) enters the pressure medium oil chamber (210) through the one-way pressure regulating valve B (205). The high-pressure air with too high internal pressure in the pressure medium oil chamber (210) enters the pressure release air chamber (202) through the one-way pressure regulating valve A (204), and then is depressurized through the pressure release valve (203).

6. The floor-mounted oil storage device for a power transformation system according to claim 1, It is characterized in that: A pressure medium oil interface (209) for communicating with the pressure medium oil connecting pipe (3) is arranged at the lower part of the outer shell (206), and an oil injection pipe (208) for injecting pressure medium oil (218) into the inner cavity of the outer shell (206) is arranged at a position close to the lower part of the outer shell (206).

7. The floor-mounted oil storage device for a power transformation system according to claim 1, It is characterized in that: A maintenance flange (201) is arranged at the upper part of the outer shell (206). The maintenance flange (201) is located between the pressurized air chamber (217) and the pressure release air chamber (202) and is used for the inspection and maintenance of the pressurized air chamber (217) and the pressure release air chamber (202); an air pump maintenance window (216) is opened on the outer shell (206) corresponding to the air pump chamber (214).

8. The floor-mounted oil storage device for a power transformation system according to claim 1, It is characterized in that: On the side of the outer shell (206) corresponding to the pressure medium oil chamber (210), a communicating tube type oil level gauge (207) and a pressure gauge B (213) are respectively installed. The communicating tube type oil level gauge (207) is used to display the oil level in the pressure medium oil chamber (210), and the pressure gauge B (213) is used to display the air pressure in the pressure medium oil chamber (210). A control cabinet (212) is fixedly connected to the side of the outer shell (206). The control cabinet (212) is connected to an adjustable high-pressure air pump (215) and is used to control the operation of the adjustable high-pressure air pump (215).

9. The floor-mounted oil storage device for a substation system according to claim 1, characterized in that: The transformer insulating oil pipeline system (4) includes a transformer and conservator connecting pipe (401), a butterfly valve B (402), an exhaust valve (403), a butterfly valve C (404), a gas relay (405), and a working pressure gauge (406). The upper part of the transformer (5) is connected to the conservator through the transformer and conservator connecting pipe (401) and the conservator connecting pipe (107). A butterfly valve B (402) and a butterfly valve C (404) are respectively provided on the transformer and conservator connecting pipe (401). The gas relay (405) and the working pressure gauge (406) are located on the pipeline between the transformer (5) and the butterfly valve C (404), and the exhaust valve (403) is located on the pipeline between the butterfly valve B (402) and the butterfly valve C (404).

10. The floor-mounted oil storage device for a substation system according to claim 1, characterized in that: There is one or more conservators (1). When there are multiple conservators (1), they are interconnected through the conservator connecting pipes (107) at the lower parts of the conservators (1). At the same time, the upper parts of the conservators (1) are respectively connected to the pressure balancing device (2), that is, one pressure balancing device (2) provides pressure medium oil (218) for multiple conservators (1) simultaneously.

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