Drainage accident oil pool suitable for booster station

Abstract

The utility model discloses a drainage accident oil pool suitable for a booster station. The drainage accident oil pool comprises a transformer accident oil storage pool, a secondary oil-water separation pool, a drainage pump pool, an oil blocking wall, an oil-water separation pipe, a drainage pump, a main transformer oil drainage pipe, a cable trench drainage pipe, an outer drainage pipe, a flow blocking wall, a clapper door and a floating ball water level gauge. The accident oil storage tank adopts a two-stage oil-water separation process, and an oil-water mixed solution formed during accident oil discharge of the transformer can achieve a better oil-water separation effect; an accident oil storage pool and a drainage pump pool in a booster station of a wind power plant or a photovoltaic power station are arranged in a combined mode, meanwhile, drained water of a cable channel in an outdoor power distribution device area of the booster station is collected to a shared drainage pump pool in a unified mode, and the drained water is lifted and drained through a drainage pump with an automatic liquid level starting and stopping function. The drainage accident oil pool is convenient for general plane planning of a booster station outdoor power distribution device area, reduces land area and civil engineering investment, and has obvious economic benefits; meanwhile, the system has the characteristics of high automation degree and convenience in operation and maintenance.

Description

Technical Field

[0001] The utility model belongs to the technical field related to civil construction of booster stations in new energy power generation projects, in particular to accident oil pools in booster stations of wind farms or photovoltaic power stations, and is used for discharging water accumulated in cable trenches in outdoor power distribution device areas of booster stations. Background Art

[0002] When the booster station of a wind farm or photovoltaic power station uses an oil-immersed transformer, an accident oil pool needs to be set up to store the accident oil discharged from the transformer. At present, most booster stations are restricted by the terrain conditions of the station site. After the rainwater in the accident oil pool and the underground cable trench in the distribution device area is collected in the station area, the liquid level is still lower than the discharge elevation of the natural drainage system outside the station, and the conditions for gravity discharge to the outside of the station are not met. It is necessary to set up multiple sump pits or drainage pump pools in the cable trench to be discharged to the outside of the booster station through drainage pumps. During the rainy season, the operation and maintenance personnel of the booster station need to frequently monitor the water volume in the cable trench and the sump pit and pump it out at any time. The degree of automation is low, and the operation and maintenance is inconvenient. Moreover, after water accumulates in the conventional accident oil pool, the oil-water mixture produced by the sudden and rapid large-scale oil leakage in the transformer accident state cannot be completely separated instantly, resulting in oil in the external drainage and polluting the environment. Utility Model Content

[0003] The purpose of the utility model is to provide a drainage accident oil pool, and a drainage pump pool in the combined station area outdoor cable trench, which is used to store transformer accident oil in the booster station and discharge rainwater in the cable trench in the outdoor distribution device area, thereby improving the degree of automation, facilitating operation and maintenance, and effectively solving the problem of environmental pollution caused by drainage outside the conventional accident oil pool.

[0004] The technical solution to achieve the purpose of the above utility model is as follows:

[0005] A drainage accident oil pool suitable for a booster station, characterized in that it includes a transformer accident oil storage pool, a secondary oil-water separation pool, and a drainage pump pool, wherein the transformer accident oil storage pool and the secondary oil-water separation pool are connected, and a main transformer oil drain pipe is provided on the upper portion of the transformer accident oil storage pool; an oil-water separation pipe is provided in the secondary oil-water separation pool, and the oil-water separation pipe is connected with the secondary oil-water separation pool and the drainage pump pool; a drainage pump and a float water level gauge of a linked water pump power supply control box are provided in the drainage pump pool, and a cable trench drainage pipe and an external drainage pipe are provided on the upper portion of the drainage pump pool.

[0006] Furthermore, an oil retaining wall is provided between the transformer emergency oil storage tank and the secondary oil-water separation tank, and the bottom elevation of the oil retaining wall is the lowest elevation of the oil storage capacity of the transformer emergency oil storage tank.

[0007] Furthermore, it also includes a flow-blocking wall arranged at the bottom of the secondary oil-water separation tank, and the flow-blocking wall is higher than the bottom elevation of the oil retaining wall.

[0008] Furthermore, it also includes a flap door arranged at the port of the cable trench drainage pipe located in the drainage pump pool.

[0009] The utility model adopts a two-stage oil-water separation process for the accident oil storage tank according to the principle of physical stratification formed by different oil and water densities. The oil-water mixed liquid formed when the transformer is accidentally drained can achieve a better oil-water separation effect, avoiding the discharged rainwater from polluting the environment. The accident oil storage tank and the drainage pump tank in the booster station of the wind farm or photovoltaic power station are integrated into a design, and the drainage of the cable trench in the outdoor power distribution device area of ​​the booster station is uniformly collected into a shared drainage pump tank, and the discharge is lifted by a drainage pump with automatic liquid level start and stop.

[0010] The beneficial effects produced by the utility model are as follows:

[0011] 1) This drainage accident oil pool integrates the drainage pump pool and the accident oil storage pool, which is convenient for the overall planning of the outdoor power distribution device area, reduces the land area and civil engineering investment, and has obvious economic benefits.

[0012] 2) The use of a two-stage oil-water separation process in the accident oil pool can better achieve the separation effect of the oil-water mixture formed by the water accumulated in the oil pool or the water discharged from the transformer water spray fire extinguishing system during the transformer accident oil discharge, thereby solving the risk of oil pollution in the external drainage.

[0013] 3) A floating ball water level gauge is installed in the drainage pump pool to link the switch of the drainage pump control box. The system has a high degree of automation and can realize the automatic start and stop of drainage according to the change of water volume in the pump pool. Compared with the conventional booster station operation and maintenance, which requires frequent monitoring of the water volume in the cable trench and sump during the rainy season and pumping at any time, the drainage accident oil pool is used for automatic discharge of rainwater accumulation in the accident oil pool and the cable trench in the outdoor distribution device area, which is convenient for the operation and maintenance of the booster station. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the planar structure of the utility model for draining an accident oil pool;

[0015] Figure 2 for Figure 1 Schematic diagram of the cross section along line AA;

[0016] Figure 3 for Figure 1 Schematic diagram of the cross section along line BB.

[0017] In the figure: 1. Transformer accident oil storage tank, 2. Secondary oil-water separation tank, 3. Drainage pump tank, 4. Oil retaining wall, 5. Oil-water separation pipe, 6. Drainage pump, 7. Main transformer oil drain pipe, 8. Cable trench drain pipe, 9. External drain pipe, 10. Flow blocking wall, 11. Clapper door, 12. Float water level gauge, H1. Water level of the accident oil tank during normal operation, H2. Elevation of the bottom of the oil retaining wall, i.e. the lowest elevation of the oil storage volume, H3. Start water level of the drainage pump, H4. Stop water level of the drainage pump. DETAILED DESCRIPTION

[0018] Reference Figure 1 , Figure 2 and Figure 3 The utility model includes a transformer accident oil storage tank 1, a secondary oil-water separation tank 2, a drainage pump tank 3, an oil retaining wall 4, an oil-water separation pipe 5, a drainage pump 6, a main transformer oil discharge pipe 7, a cable trench drainage pipe 8, an external drainage pipe 9, a flow blocking wall 10, a clapboard door 11, and a float water level gauge 12. The oil retaining wall 4 is arranged between the transformer accident oil storage tank 1 and the secondary oil-water separation tank 2, and they are connected through the bottom of the oil retaining wall 4. The bottom elevation of the oil retaining wall is the lowest elevation of the oil storage volume of the transformer accident oil storage tank. The main transformer oil discharge pipe 7 is arranged on the upper part of the transformer accident oil storage tank 1. The secondary oil-water separation tank 2 is provided with an oil-water separation pipe 5, and the oil-water separation pipe 5 is connected with the secondary oil-water separation tank 2 and the drainage pump tank 3. The flow blocking wall 10 is arranged at the bottom of the secondary oil-water separation tank 2, and the flow blocking wall 10 is higher than the bottom elevation of the oil retaining wall. The drainage pump pool 3 is provided with a drainage pump 6 and a float water level gauge 12 linked to a water pump power supply control box. A cable trench drainage pipe 8 and an external drainage pipe 9 are provided on the upper part of the drainage pump pool 3. A flap door 11 is provided at the port of the cable trench drainage pipe 8 located in the drainage pump pool 3.

[0019] During the construction of the booster station, the oil retaining pit at the bottom of the oil-immersed transformer is connected to the main transformer oil drain pipe 7 through a pipeline, the sump set in the cable trench in the outdoor distribution device area is connected to the cable trench drain pipe 8 through a pipeline, and the external drain pipe 9 is connected to the rainwater drainage system outside the station.

[0020] After the accident oil pool is built, the transformer accident oil storage pool 1 and the secondary oil-water separation pool 2 connected thereto are first filled with water to the water level H1. When the main transformer needs to discharge oil in an accident, the oil flows into the transformer accident oil storage pool 1 through the main transformer oil discharge pipe 7. Due to the different densities of oil and water, the first-level separation of the oil-water mixture is completed in the accident oil storage pool 1. The transformer oil is located above the water. The generated hydraulic pressure difference presses the water through the lower part of the oil retaining wall 4 into the secondary oil-water separation pool 2. The set flow-blocking wall 10 can stabilize the flow state and velocity of the oil-water mixture formed in the transformer accident oil storage pool 1 when the oil is discharged, which is conducive to improving the first-level oil-water separation effect. If the oil-water mixture flows into the water in the secondary oil-water separation pool 2, the oil-water separation pipe 5 can be used to separate the oil and water again to prevent the transformer oil from flowing into the drainage pump pool 3. The said floating ball water level gauge 12 linked to the water pump power supply control box is provided in the said drainage pump pool 3. After the water in the cable trench or the accident oil storage tank flows into the drainage pump pool 3, the pump pool water level rises from the pump stop water level H4 to the pump start water level H3, then the said floating ball water level gauge 12 is linked to the power supply control box of the said drainage pump 6 to start drainage. The said cable trench drainage pipe 8 is provided with the said flapper door 11 in the said drainage pump pool 3, which can ensure that the water in the said drainage pump pool 3 will not flow back to the cable trench.

[0021] At present, the capacity of a single main transformer in a conventional wind farm or photovoltaic power station booster station is 50 to 325 MVA, and the corresponding single oil volume is 18 to 57 tons. The accident oil pool set up according to the total oil volume of the main transformer with the largest oil volume in the booster station and the pump pool used for drainage of the accident oil pool and the cable trench in the outdoor distribution device area are jointly designed. The flow selection of the drainage pump and the volume size of the pump pool are adjusted and determined according to the drainage requirements of the specific project.

Claims

1. A drainage accident oil pool suitable for a booster station, characterized by: The utility model comprises a transformer accident oil storage tank (1), a secondary oil-water separation tank (2), and a drainage pump tank (3). The transformer accident oil storage tank (1) and the secondary oil-water separation tank (2) are connected. A main transformer oil drain pipe is arranged on the upper part of the transformer accident oil storage tank (1); an oil-water separation pipe (5) is arranged in the secondary oil-water separation tank (2), and the oil-water separation pipe (5) is connected with the secondary oil-water separation tank (2) and the drainage pump tank (3); a drainage pump (6) and a floating ball water level gauge (12) linked to a water pump power supply control box are arranged in the drainage pump tank (3); a cable trench drainage pipe (8) and an external drainage pipe (9) are arranged on the upper part of the drainage pump tank (3).

2. The drainage accident oil pool suitable for a booster station according to claim 1, characterized in that: An oil retaining wall (4) is provided between the transformer accident oil storage tank (1) and the secondary oil-water separation tank (2), and the bottom elevation of the oil retaining wall (4) is the lowest elevation of the oil storage volume of the transformer accident oil storage tank (1).

3. The drainage accident oil pool suitable for a booster station according to claim 2, characterized in that: It also comprises a flow-blocking wall (10) arranged at the bottom of the secondary oil-water separation tank (2), wherein the flow-blocking wall (10) is higher than the bottom elevation of the oil retaining wall (4).

4. The drainage accident oil pool suitable for a booster station according to claim 1, characterized in that: It also includes a flap door (11) arranged at the port of the cable trench drainage pipe (8) located in the drainage pump pool (3).

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