All-weather transformer accident oil pool for new energy power station in desert area

Abstract

This invention discloses an all-weather transformer emergency oil tank for new energy power plants in desert areas. It includes an oil tank body located underground, a reinforced concrete structure with an internal heating layer. An oil inlet pipe and a drain pipe are installed on the side wall of the oil tank body. The inlet end of the drain pipe is connected to a vertical pipe, and the outlet end is lined with pebbles. The liquid inlet at the bottom of the vertical pipe is located close to the bottom surface of the inner cavity of the oil tank body. A vent pipe is installed at the top of the oil tank body. Temperature sensors, pressure sensors, liquid level sensors, and air quality sensors are installed inside the oil tank body. This invention features a simple structure, convenient construction, high automation, and low maintenance costs. It provides all-weather, low-risk oil-water separation for emergency oil tanks, ensuring the safety of substations. It is environmentally friendly and safe, and very user-friendly for operation and maintenance personnel.

Description

Technical Field

[0001] This invention relates to the field of transformer emergency oil tank technology, and in particular to an all-weather transformer emergency oil tank for new energy power plants in desert areas. Background Technology

[0002] Desert regions, benefiting from their simple land types, minimal surface attachments, and low land costs, have become popular sites for new energy power plant construction in recent years. However, due to the simple power grid structure in desert regions and the high proportion of installed capacity of new energy power plants within their supply areas, the power system stability of new energy power plants in desert regions is weak, resulting in a high failure rate. According to the classification in the "Specification for Calculation of Power System Safety and Stability" (GB / T 40581-2021), an MRSCR less than 2.0 is considered an extremely weak system. In actual engineering practice, the MRSCR of the medium-voltage distribution bus of some new energy power plants is only 1.61, far below the standard line of 2.0 for extremely weak systems. Under the background of extremely weak power system stability, the equipment failure rate of new energy power plants increases significantly. According to feedback from operation and maintenance personnel of some projects, the main transformers of the power plants have experienced minor oil leakage under repeated impacts during operation, and there have even been cases of fires and burns in the step-up transformers of some generating units.

[0003] A transformer emergency oil pool is an auxiliary structure for electrical equipment, set up near a transformer to temporarily collect and store leaked insulating oil. It is also an essential safety and environmental protection facility for new energy power plants in areas with extremely weak power system stability. The transformer emergency oil pool is mainly used to collect rainwater mixed with oil sludge in the transformer's oil storage tank during the rainy season, and to collect emergency oil from the transformer in the event of a malfunction. The former, in smaller quantities, is usually left in the pool, maintaining a stratified state of oil above water. The latter, when receiving larger quantities of oil, may involve the discharge of lower water from the emergency oil pool. Due to the extreme cold of winter temperatures in arid regions, the lower water in the emergency oil pool is prone to freezing. If emergency oil needs to be received in this situation, the lower water cannot be discharged smoothly, affecting the effective volume of the emergency oil pool and, in severe cases, endangering the operational safety of the power station, thus posing a potential hazard to substation operation. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an all-weather transformer emergency oil tank for new energy power plants in desert areas, specifically employing the following technical solution: The all-weather transformer emergency oil tank for new energy power plants in desert areas, as described in this invention, includes an oil tank body located underground. The oil tank body is situated on a concrete foundation and is a reinforced concrete structure with an internal heating layer. An oil inlet pipe is installed on one side wall of the oil tank body, and a drain pipe is installed on the opposite side wall of the oil tank body. The inlet end of the drain pipe is connected to a vertical pipe, and the outlet end of the drain pipe is covered with accumulated pebbles. The bottom of the vertical pipe is a liquid inlet located near the bottom surface of the inner cavity of the oil tank body. A vent pipe is installed at the top of the oil tank body. Temperature sensors, pressure sensors, liquid level sensors, and air quality sensors are installed inside the oil tank body. The signal output terminals of the temperature sensors, pressure sensors, liquid level sensors, and air quality sensors are connected to the signal input terminals of a control center. The control output terminal of the control center is connected to the control input terminal of the heating layer, and the signal output terminal of the control center is connected to a display screen. The display screen is used to display the temperature, pressure, liquid level, and air quality values.

[0005] This invention is used to collect oil-water mixtures formed by rainwater mixing with oil sludge in transformer oil storage tanks during the rainy season, and to collect emergency oil from transformers in the event of operational failures. During the rainy season, the oil-water mixture settles and separates into layers within the oil tank cavity, with the lighter oil on top and the heavier water at the bottom. Temperature sensors monitor the temperature inside the oil tank in real time. Once the temperature drops to freezing point, the heating layer within the reinforced concrete structure is energized to prevent the water layer from freezing and blocking the vertical pipes. This ensures that when receiving emergency oil, the lower layer of water can be smoothly discharged from the emergency oil tank, ensuring the effective volume of the emergency oil tank and guaranteeing the safe operation of the substation.

[0006] Preferably, the oil tank body includes a reinforced concrete layer, a heating layer and a cement mortar plastering layer arranged sequentially from the outside to the inside, wherein the heating layer adopts a carbon fiber electric heating grid.

[0007] In this invention, the reinforced concrete layer ensures the structural strength of the accident oil tank, and the heating layer uses a carbon fiber heating grid with fast heating speed and high heating efficiency, which is conducive to the rapid response of the anti-icing measures of the accident oil tank. The cement mortar plastering on it can effectively prevent the carbon fiber heating grid from being eroded and damaged by the liquid in the oil tank, thus ensuring the heating function of the oil tank.

[0008] Preferably, the oil inlet pipe is positioned higher than the drain pipe, and the heating layer is positioned on the side wall and bottom plate of the oil tank body below the drain pipe.

[0009] The design of the oil inlet pipe being higher than the drain pipe in this invention ensures that the accident oil pool can effectively collect accident oil and separate oil and water. The height restriction of the heating layer is used to reduce construction difficulty and cost while ensuring heating effect.

[0010] Preferably, the outlet end of the drainage pipe is located in the soil below ground level, and the piled pebbles are composed of pebbles of different particle sizes.

[0011] This invention avoids direct drainage into the underground soil by setting up piled pebbles at the outlet end of the drainage pipe. Compared with denser soil, piled pebbles have a larger porosity, which can buffer the water flow rate and allow the external drainage to fully infiltrate into the soil. Specifically, pebbles of appropriate particle size can be selected for mixing and piling based on factors such as soil density and drainage volume.

[0012] Preferably, the vent pipe is an inverted U-shaped structure extending above the ground, and the outlet end of the vent pipe is sealed with wire mesh.

[0013] The present invention uses an inverted U-shaped vent pipe, which can prevent rainwater and debris from entering the oil tank through the pipe body. The wire mesh sealing at its end has a fire-resistant function, ensuring the safety of the emergency oil tank.

[0014] Preferably, the temperature sensor and the air quality sensor are disposed on the inner wall of the oil tank body, the pressure sensor is disposed on the bottom surface of the inner cavity of the oil tank body, and the liquid level sensor is disposed on the top surface of the inner cavity of the oil tank body.

[0015] This invention collects information such as temperature, liquid pressure, and liquid level inside the emergency oil tank by setting up temperature sensors, pressure sensors, and liquid level sensors. The data processing center displays, summarizes, and analyzes the various data, and then implements various countermeasures based on the actual situation. For example, the oil-water boundary is determined based on temperature, pressure, and liquid level information, and the heating time of the heating layer is determined to ensure the unobstructed flow of the drainage pipe with low energy consumption; the air quality monitoring results from the air quality sensor determine whether maintenance personnel are allowed to enter the oil tank.

[0016] Preferably, the top of the oil tank body is provided with an inspection hole, and the inner cavity sidewall of the oil tank body is provided with an inspection ladder.

[0017] This invention includes inspection holes and ladders to facilitate maintenance personnel going down into the well for inspections. Before going down into the well, it is necessary to ensure air quality to avoid gas poisoning and ensure the safety of personnel.

[0018] Preferably, a micro-expansion waterproof mortar sealing layer is provided between the oil inlet pipe, the drain pipe and the oil tank body, and neutral silicone weather-resistant sealant is provided at both the inner and outer ends of the micro-expansion waterproof mortar sealing layer.

[0019] The above structure can effectively solve the sealing problem between the oil inlet pipe, the drain pipe and the oil tank body, preventing the liquid in the oil tank from leaking out and polluting the external environment.

[0020] This invention provides an all-weather transformer emergency oil pool for new energy power plants in desert areas. During the rainy season, it collects rainwater mixed with oil sludge in the transformer's oil storage tank, forming an oil-water mixture. In the event of a transformer malfunction, it collects emergency oil. A heating layer prevents the water in the oil pool from freezing in cold seasons. When a large amount of emergency oil enters the pool, the lower layer of water can be smoothly drained, ensuring the effective volume of the emergency oil pool and guaranteeing the safe operation of the substation. This invention features a simple structure, convenient construction, high automation, and low maintenance costs. It provides all-weather, low-risk oil-water separation for the emergency oil pool, ensuring substation safety. It is environmentally friendly, safe, and very user-friendly for maintenance personnel. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 yes Figure 1 A schematic diagram of the structure of the oil reservoir.

[0023] Figure 3 yes Figure 1 A schematic diagram of the connection structure between the inlet pipe and the oil tank body.

[0024] Figure 4 This is a block diagram illustrating the control principle of the present invention. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific working processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0026] like Figure 1-4 As shown, the all-weather transformer emergency oil tank for new energy power plants in desert areas according to the present invention includes an oil tank body 1 installed underground. The oil tank body 1 is a reinforced concrete structure and is installed on a concrete foundation 2. An oil inlet pipe 3 is provided on the side wall of the oil tank body 1, and a drain pipe 4 is provided on the opposite side wall of the oil tank body 1. The inlet end of the drain pipe 4 is connected to a vertical pipe 5, and the outlet end of the drain pipe 4 is provided with piled pebbles 6. A vent pipe 7 and an inspection hole are provided on the top of the oil tank body 1. A temperature sensor 8, a pressure sensor 9, a liquid level sensor 10, an air quality sensor 11, and an inspection ladder 12 for easy climbing are provided on the inner wall of the oil tank body 1.

[0027] The aforementioned oil tank body 1 is located underground, which optimizes space utilization and reduces fire risk. The underground environment provides insulation, preventing the oil tank from freezing due to rapid cooling caused by direct exposure to air in cold desert conditions. Furthermore, to prevent freezing, the side walls and bottom plate of the oil tank body 1 are heated, consisting of a reinforced concrete layer 1.1, a heating layer 1.2, and a cement mortar finishing layer 1.3 arranged sequentially from the outside in. Typically, the reinforced concrete layer 1.1 is 250mm thick, while the heating layer 1.2 and the cement mortar finishing layer 1.3 are both 20mm thick. The heating layer 1.2 uses a carbon fiber electric heating grid, which heats up quickly upon energization, providing excellent electrothermal effect. In this embodiment, the carbon fiber electric heating grid is embedded in the side wall below the bottom plate and drainage pipe 4 of the oil tank body 1, saving investment while also ensuring effective heating of the lower water layer.

[0028] A micro-expansion waterproof mortar sealing layer 31 is installed between the oil inlet pipe 3 and the drain pipe 4 and the oil tank body 1. Neutral silicone weather-resistant sealant 3.2 is applied to both the inner and outer ends of the micro-expansion waterproof mortar sealing layer 3.1 to solve the sealing problem between the oil inlet pipe 3, drain pipe 4 and the oil tank body 1, preventing liquid leakage from the oil tank and pollution of the external environment. Normally, the oil inlet pipe 3 is installed higher than the drain pipe 4. Since the drain pipe 4 extends directly into the soil, the dense soil cannot absorb a large amount of water in a short time, affecting the drainage of the oil tank body 1. Therefore, piled pebbles 6 are placed at the outlet end of the drain pipe 4. The pebble 6, with its high porosity, buffers the water flow velocity, allowing the external drainage to fully infiltrate the soil. During construction, pebbles of appropriate particle size can be selected for mixing and piling based on factors such as soil density and drainage volume. The aforementioned drain pipe 4 is connected to a vertical pipe 5 located inside the oil tank body 1. The vertical pipe 5 is located near the side wall of the oil tank, with its top higher than the drain pipe 4 and equipped with an air inlet. Its bottom is approximately 10 cm below the bottom of the inner cavity of the oil tank body and is equipped with a liquid inlet. The vent pipe 7 at the top of the oil tank body 1 is an inverted U-shaped structure extending above the ground, and the outlet end of the vent pipe 8 is sealed with wire mesh.

[0029] The temperature sensor 8 is installed on the inner wall of the oil tank body 1, the pressure sensor 9 is installed on the bottom surface of the inner cavity of the oil tank body 1, and the liquid level sensor 10 and the air quality sensor 11 are installed on the top surface of the inner cavity of the oil tank body 1. The signal output terminals of each sensor are connected to the signal input terminals of the control center, and the control output terminals of the control center are connected to the control input terminals of the heating layer 1.2.

[0030] During the rainy season, the oil-water mixture formed by the oil sludge in the transformer's oil storage tank continuously enters the tank body 1 through the oil inlet pipe 3. After settling, it separates into layers, with the lighter oil on top and the heavier water at the bottom. The temperature sensor 8 can detect the temperature in the oil tank in real time. When the cold season arrives, once the liquid temperature is detected to drop to the freezing point, the control center performs a comprehensive analysis based on the received temperature signal, pressure signal, and liquid level signal to calculate the water-oil interface height and control the heating time of the heating layer 1.2 to prevent the water layer from freezing and blocking the vertical pipe 5, ensuring that the transformer can smoothly receive emergency oil in the event of an accident.

[0031] When a transformer malfunctions, the fault oil enters the oil tank body 1 through the inlet pipe 3. Due to the increased oil volume in the tank, under the pressure of the upper oil layer, the lower water enters the vertical pipe 5 from the bottom and is discharged from the oil tank body 1 through the drain pipe 4. Under normal circumstances, the discharge of the lower water increases the effective volume of the oil tank body 1, ensuring that all fault oil is stored within the oil tank body 1 and guaranteeing the safe operation of the substation.

[0032] When it is necessary to inspect the oil tank body 1, first determine whether the conditions for inspection are met based on the air quality value of the air quality sensor 11 displayed on the screen, so as to avoid situations that may harm the health of personnel, such as gas poisoning.

[0033] It should be noted that in the description of this invention, terms such as "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

Claims

1. An all-weather transformer emergency oil tank for new energy power plants in desert areas, characterized in that: The system includes an oil tank body located underground, situated on a concrete foundation. The oil tank body is a reinforced concrete structure with an internal heating layer. An oil inlet pipe is located on one side wall of the oil tank body, and a drain pipe is located on the opposite side wall. The inlet end of the drain pipe is connected to a vertical pipe, and the outlet end is covered with pebbles. The bottom of the vertical pipe is a liquid inlet located near the bottom of the inner cavity of the oil tank body. A vent pipe is located at the top of the oil tank body. Temperature, pressure, liquid level, and air quality sensors are installed within the oil tank body. The signal output terminals of these sensors are connected to the signal input terminals of a control center. The control output terminal of the control center is connected to the control input terminal of the heating layer. The signal output terminal of the control center is connected to a display screen, which displays the temperature, pressure, liquid level, and air quality values.

2. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: The oil tank body includes a reinforced concrete layer, a heating layer and a cement mortar plastering layer arranged sequentially from the outside to the inside, wherein the heating layer adopts a carbon fiber electric heating grid.

3. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: The oil inlet pipe is positioned higher than the drain pipe, and the heating layer is positioned on the side wall and bottom plate of the oil tank body below the drain pipe.

4. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: The outlet end of the drainage pipe is located in the soil below ground level, and the piled pebbles are composed of pebbles of different particle sizes.

5. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: The vent pipe is an inverted U-shaped structure extending above the ground, and the outlet end of the vent pipe is sealed with wire mesh.

6. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: The temperature sensor and air quality sensor are installed on the inner wall of the oil tank body, the pressure sensor is installed on the bottom surface of the inner cavity of the oil tank body, and the liquid level sensor is installed on the top surface of the inner cavity of the oil tank body.

7. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: The top of the oil tank body is provided with an inspection hole, and an inspection ladder is provided on the inner cavity side wall of the oil tank body.

8. The all-weather transformer emergency oil tank for new energy power plants in desert areas according to claim 1, characterized in that: A micro-expansion waterproof mortar sealing layer is provided between the oil inlet pipe, the drain pipe and the oil tank body, and neutral silicone weather-resistant sealant is provided at both the inner and outer ends of the micro-expansion waterproof mortar sealing layer.

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