CN218392004U - Oil collecting pit overflow risk detection device for converter station/transformer substation - Google Patents

Abstract

The utility model discloses an oil collecting pit overflow risk detection device for a converter station/transformer substation; an oil pit of the local model with the reduced size is installed above the second box body, a pipeline is installed between one end of the first box body and one end of the shell, a spray head is installed at one end, corresponding to the shell, of the pipeline, a liquid discharge pipe is communicated with the other end, opposite to the spray head, of the shell, and a pebble layer is laid at the bottom of the shell. The method is used for detecting whether various mixed liquids have overflow risks in unit time, wherein the mixed liquids refer to solutions formed by mixing oil and fire extinguishing media. Theoretical reference is provided for arranging fire extinguishing medium and setting the spraying amount of the fire extinguishing medium in a converter transformer station, and the achievement can provide technical support for improving the fire fighting capacity of the ultrahigh voltage engineering in operation and construction and provide technical support for the subsequent establishment of relevant fire fighting regulation specifications of the ultrahigh voltage converter station.

Description

Oil collecting pit overflow risk detection device for converter station/transformer substation

Technical Field

The utility model belongs to the technical field of power station fire-fighting equipment detects, especially, relate to an oil collecting pit that is used for converter station/transformer substation and spills over risk detection device.

Background

The power grid is an important life line of national economy, ensures safe, reliable and stable operation of the power grid, and is vital to promotion and guarantee of national economy development. In a power transmission and transformation system of a power grid engineering, a converter station is the basis of long-distance high-voltage power transmission, has great significance in stable operation and is directly concerned with the safety of a power system and the quality guarantee of electric energy. The national grid company forms a multi-voltage-level power grid which is layered, partitioned and clear in structure and comprises an extra-high voltage power grid serving as a backbone grid frame, an extra-high voltage power transmission grid, a high voltage power transmission grid and a power distribution network. With the rapid development of the power grid scale and technology, fire fighting of different voltage classes faces different fire risks.

The converter station has large number of running equipment and high equipment running temperature, and belongs to key fire-fighting and fire-fighting units. The diversity and technical complexity of electrical equipment devices impose strict requirements on the fire protection of the converter station. Because the converter station uses a large amount of oil-filled electrical equipment, fire accidents mostly belong to explosion or fire accidents caused by the oil-filled equipment, light persons damage the switch equipment to cause monopole shutdown, heavy persons burn the converter equipment to force shutdown for maintenance, power transmission is seriously influenced, and even the operation safety of a cross-regional power grid is endangered.

The national grid deploys a series of fire-fighting capacity improving measures aiming at large-scale oil-filled equipment areas of a flow-changing station and a transformer substation, wherein the added systems comprise a fire-fighting water monitor system, a low-power foam monitor system, a compressed air foam monitor system, an emergency oil discharge system and the like. Experiments prove that the newly added typical systems can effectively improve the fire handling capacity of the converter station. The fire extinguishing medium cannot extinguish the fire for the first time, the principle is that the fire extinguishing medium covers the surface of the combustible oil, the oil is prevented from contacting with air, oxygen is isolated, and therefore the fire extinguishing purpose is achieved, and after the fire extinguishing medium and the combustible oil are mixed, the volume of the fire extinguishing medium is increased, the fire extinguishing medium can diffuse to the surroundings, and the fire is spread. In order to prevent the overflowing oil from diffusing, oil pits are arranged around the converter transformer, and the bottom of the converter transformer is separately provided with a foundation for supporting large-scale oil-filled equipment.

As shown in fig. 1, the bottom construction of the large oil-filled equipment is excavation of a foundation pit, then cement enclosure is constructed to form an oil pit, a foundation is built in the center of the oil pit and used for supporting the large oil-filled equipment, most of the existing oil pits are basically the same as the structure of fig. 1, the oil pit is separated into two parts by the foundation, a pebble layer is laid at the bottom of the oil pit, the thickness of the pebble layer is 300mm, the pebble layer is composed of graded pebbles with the grain diameter of 50mm-80mm, the porosity is about 30%, pores of the pebble layer are used for penetrating combustible oil and fire extinguishing media, and after the combustible oil penetrates the pebble layer, the low porosity of the pebble layer can block air, directly pinch off a fire source, and meanwhile, the heat absorption of the pebble layer is beneficial to temperature reduction and fire extinguishment. Finished galvanized steel grids are correspondingly installed at the tops of the oil pits, the grid mesh size is 50 x 50, grid rib plates are 10mm thick, and the net size of holes is 40 x 40, so that the finished galvanized steel grids are used for ground surface support and are convenient for workers to normally operate.

The end part of the oil pit at one side is provided with an oil collecting pit, the oil collecting pit is positioned below the pebble layer, the oil collecting pit is communicated with a liquid discharge pipe and is used for collecting mixed liquid (the mixed liquid comprises oil and fire extinguishing medium) of the oil pits at two sides, and the oil collecting pit is arranged at only one side, so one side of the foundation corresponding to the oil collecting pit is communicated with a communicating pipe which is used for communicating the oil pits at two sides, and the pipe bottom of the communicating pipe is flush with the bottom of the oil pit.

For a station, after a plurality of systems are newly added, for an oil pit system similar to the oil pit system with the structure shown in fig. 1, the original emergency oil discharge accident pipeline is considered to be a deep buried pipe in a converter transformer square or other places and is not synchronously upgraded. The fire extinguishing system matched with the oil pit area is various, the fire extinguishing system only has unilateral water as a fire extinguishing medium possibly matching water and foam to form the fire extinguishing medium, the proportioning relation between the type composition and the spraying amount of the fire extinguishing medium is different for different convertor stations, so that the mixed liquid component formed by mixing the fire extinguishing medium and oil flowing out of the convertor stations is complex, and on one hand, a liquid discharge pipeline is not upgraded and matched in time for the situation. The mixed liquid is collected at the pipe orifice of the liquid discharge pipe, and the mixed liquid collected by the oil pit can not be discharged in time due to limited discharge capacity of the liquid discharge pipe, so that overflow risk is caused. The overflowing mixed liquid contains combustible oil, and may overflow an oil pit to form a flowing fire.

On the other hand, because the oil pit has no overhead layer, the mixed liquid does not permeate to the next layer but flows towards the direction of the oil collecting pit in the oil pit, the mixed liquid needs to pass through the pores of the pebble layer in the flowing process, the surface adhesive force of the pebbles and the mixed liquid has certain barrier effect on the flowing of the mixed liquid, the flow rate of the mixed liquid is reduced, the mixed liquid cannot reach the oil collecting pit in time, and accumulation is formed in the oil pit, so that the overflow risk is generated.

In summary, with the oil pit structure similar to that shown in fig. 1, the flow rate of the drain pipe and the pebble layer are both key factors that influence whether the mixed liquid can be discharged in time. If this influencing factor is present, there is an uncertain problem as to whether the mixed liquid of the fire extinguishing medium and the oil in the converter transformer station will run into an overflow under the influence of the above two influencing factors. Therefore, the utility model discloses mainly be to this uncertain problem, propose the sump pit that is used for converter station/transformer substation and spill over risk detection device and detection method, confirm with the condition that has the cobble layer to obstruct at the fluid-discharge tube flow, detect the mixed liquid that different fire extinguishing medium and oil constitute, whether can appear spilling over the risk under the condition of the actual ejection velocity of flow of simulation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that under the circumstances that the flowing back pipe flow was confirmed and had the pebble bed to obstruct, detect the mixed liquid that different fire extinguishing medium and oil are constituteed, whether can appear spilling over the risk under the circumstances of the actual velocity of flow of spouting of simulation

The utility model discloses a following technical means realizes solving above-mentioned technical problem:

oil collecting pit overflow risk detection device for converter station/substation,

the fire extinguishing device comprises a first box body for containing a mixed liquid of transformer oil and a fire extinguishing medium;

the second tank body is used for receiving the mixed liquid of the transformer oil and the fire extinguishing medium;

an oil pit of a local model with a reduced size is arranged above the second box body, the oil pit comprises a shell, the shell is cuboid, and the upper side of the shell is open;

a pipeline is arranged between the first box body and one end of the shell, a spray head is arranged at one end of the pipeline corresponding to the shell, the spray head is positioned above the end side of the shell, and the pipeline is connected with a water pump, a pressure gauge, an adjusting valve and a flowmeter in series;

the bottom of the other end of the shell, which is opposite to the spray head, is communicated with a liquid discharge pipe, and the liquid discharge pipe is positioned above the opening of the second box body; and a pebble layer is paved at the bottom of the shell.

Furthermore, the fluid-discharge tube is detachably mounted, the lower end of the fluid-discharge tube is aligned with the opening of the second box body, the upper end of the fluid-discharge tube is provided with a butt flange, the shell is correspondingly provided with a fluid-discharge hole, the circumferential side of the fluid-discharge hole is provided with a screw hole for aligning with the butt flange, and the butt flange and the screw hole are fixedly mounted through bolts.

Furthermore, the device also comprises a support frame, wherein a support plate is fixed at the top of the support frame; the housing is placed on a support plate; the second box body is positioned in the support frame; the supporting plate is provided with a through hole for the liquid discharge pipe to pass through, and the supporting frame is of a frame type.

Furthermore, universal wheels are arranged at four top corners of the supporting frame; turning the support frame to form a movable container; the support frame can contain a shell, a first box body, a second box body, a pipeline and all parts connected to the pipeline in series.

Furthermore, a baffle is inserted into one side of the outer shell corresponding to the spray head, a spraying area is formed between the baffle and the end side of the outer shell, and the spray head extends to the spraying area; the bottom edge of the baffle is in contact with the upper surface of the pebble layer.

Further, baffle demountable installation has the fixture block in the shell, shell avris, the fixture block symmetry is fixed in the shell both sides, and for the avris position installation of baffle, the fixture block correspondence is seted up and is blocked the draw-in groove of baffle avris into.

Furthermore, the lateral wall of one side of shell is made for transparent material's ya keli board.

Furthermore, a connecting pipe is communicated between the first box body and the second box body, the connecting pipe is connected with a valve in series, and the first box body and the second box body are externally sleeved with a frame for protection and support.

The utility model has the advantages of:

the detection device simulates a local model with a reduced size according to the specification of an actual oil pit and is used for detecting the overflow risk of a converter transformer substation. The device is used for detecting whether overflow risks occur in unit time in various mixed liquids, wherein the mixed liquids refer to solutions formed by mixing oil and fire extinguishing media, and theoretical references are provided for fire extinguishing media arranged in a converter transformer site and fire extinguishing medium spraying amount.

The achievement can provide technical support for improving the fire-fighting capacity of the ultra-high voltage engineering in operation and under construction, and provides technical support for the subsequent establishment of relevant fire-fighting regulation specifications of the ultra-high voltage converter station.

The universal wheel is installed at the top of the supporting frame, a container is formed after the supporting frame is turned, other parts such as the two box bodies and the shell can be placed in the container to be stored in a unified mode, the supporting frame is convenient to move, and parts are prevented from being lost.

Drawings

Fig. 1 is a structural diagram of a current converting station in an actual state introduced in the background art of the present invention.

Fig. 2 is an overall structure diagram of the device in the embodiment of the present invention.

Fig. 3 is a structural diagram of the device according to the embodiment of the present invention after the second box and the housing are disassembled and cut.

In the drawings, the components represented by the respective reference numerals are listed below:

the device comprises a first box body 1, a second box body 2, a shell 4, a pipeline 3, a spray head 35, a water pump 31, a pressure gauge 32, a regulating valve 33, a flow meter 34, a liquid discharge pipe 6, a pebble layer 41, a butting flange 61, a liquid discharge hole 42, a screw hole 43, a bolt 62, a supporting plate 5, a through hole 51, a supporting frame 52, a baffle 7, a fixture block 71, an acrylic plate 44, a frame 21, a discharge opening 51', a universal wheel 521, a connecting pipe 11 and a valve 12.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 2 and 3: the oil collecting pit overflow risk detection device for the converter station/transformer substation comprises a first box body 1 for containing transformer oil and fire extinguishing medium mixed liquid; comprises a second box body 2 for receiving the mixed liquid of the transformer oil and the fire extinguishing medium; an oil pit of a local model with a reduced size is arranged above the second box body 2, the oil pit comprises a shell 4, the shell 4 is cuboid, and the upper side of the shell 4 is open; the shell is made of iron sheet.

A pipeline 3 is arranged between the first box body 1 and one end of the shell 4, a spray head 35 is arranged at one end of the pipeline 3 corresponding to the shell 4, the spray head 35 is positioned above the end side of the shell 4, and the pipeline 3 is connected with a water pump 31, a pressure gauge 32, an adjusting valve 33 and a flow meter 34 in series; the pipeline is used for conveying liquid in the first box body to the spray head, the liquid is sprayed out through the spray head, the pipeline is integrally horizontal and has the same height, and the pipeline is provided with a supporting structure and is positioned at the bottom of the communicating end of the first box body. The pressure gauge is a mechanical pressure gauge and is used for monitoring the liquid pressure in the test process. The flowmeter is an electromagnetic flowmeter and is used for monitoring the flow in the test process.

The other end of the shell 4 opposite to the spray head 35 is communicated with a liquid discharge pipe 6, the liquid discharge pipe 6 is positioned above the second box body 2, and a pebble layer 41 is paved at the bottom of the shell 4. The drain pipe adopts DN50 specification. The thickness of the pebble layer is 300mm, the pebble layer is composed of graded pebbles with the grain diameter of 50mm-80mm, the porosity is about 30%, and the height of the pebble layer and the upper side opening side of the shell is also 300mm.

As shown in fig. 3: the liquid discharge pipe 6 is detachably mounted, the lower end of the liquid discharge pipe 6 is aligned with the opening of the second box 2, the upper end of the liquid discharge pipe 6 is provided with a butting flange 61, the shell 4 is correspondingly provided with a liquid discharge hole 42, the circumferential side of the liquid discharge hole 42 is provided with a screw hole 43 used for aligning with the butting flange 61, and the butting flange 61 and the screw hole 43 are fixedly mounted through bolts 62.

As shown in fig. 3: a supporting plate 5 is arranged between the shell 4 and the second box body 2, the supporting plate 5 is used for supporting the bottom of the shell, a through hole 51 for the liquid discharge pipe 6 to pass through is formed in the shell 4, the supporting plate 5 is supported by a supporting frame 52, and the supporting frame 52 is of a frame type.

As shown in fig. 3: a baffle 7 is inserted into one side of the outer shell 4 corresponding to the spray head 35, a spraying area is formed between the baffle 7 and the end side of the outer shell 4, and the spray head 35 extends to the spraying area. The baffle plate is used for preventing the spray head from spraying outwards, and the lower side of the baffle plate is positioned on the upper side of the pebble bed and does not block the pebble bed.

As shown in fig. 3: the baffle 7 is detachably mounted on the housing 4, the side of the housing 4 is provided with a fixture block 71, the fixture blocks 71 are symmetrically fixed on two sides of the housing 4, the fixture block 71 is mounted on the side of the baffle 7, and a clamping groove clamped into the side of the baffle 7 is correspondingly formed in the fixture block 71.

As shown in fig. 1: the single-side wall of the housing 4 is made of an acrylic plate 44 made of a transparent material. The outer surface of the transparent surface is provided with a graduated scale for convenient observation and reading. The flow of the internal mixed liquid is clearly observed.

As shown in fig. 2 and 3: still communicate between first box 1 and the second box 2 and have connecting pipe 11, connecting pipe 11 has concatenated valve 12, and first box 1 and the outside frame 21 that is used for protection and support that all cup joints of second box 2. The first box body and the second box body are plastic box bodies, the first box body and the second box body are box bodies of the same specification, and the frame is formed by splicing transverse and longitudinal steel bars. The connecting pipe is used for communicating first box and second box, makes the mixed liquid in two boxes can recycle, when need using the same mixed liquid to different specification test assembly, can open the mixed liquid circulation each other between the valve messenger two boxes.

In this embodiment, in order to facilitate the removal of the pebbles after the detection is finished, a blanking port is formed at the bottom of the housing, and the blanking port is sealed and plugged by a flange plate. Correspondingly, a discharge opening 51' is formed at the position of the support plate 5 below the discharge opening. The discharge openings 51' are offset from the plane of the second box 2 to facilitate the placement of the pebble collection box in the support frame 52.

In order to store all parts and boxes uniformly after detection is finished and avoid loss, universal wheels 521 are installed at four top corners of the support frame 52 in the embodiment; turning the support frame 52 to form a movable container; the support frame 52 can accommodate the housing 4, the first casing 1, the second casing 2, the pipes and all the components connected in series to the pipes. The support frame can be pushed to move, and the operation is convenient and fast.

The detection method of the oil sump overflow risk detection device for the converter station/substation comprises the following steps,

(1) Debugging a water pump, a flowmeter, an adjusting valve and a pressure gauge related to the test model to ensure that the flow and pressure readings are displayed clearly;

(2) Adding a mixed solution for test into the first box body, wherein the mixed solution is one of an oil-water mixed solution, an oil 3% foam mixed solution and an oil-water 3% foam mixed solution;

(3) Starting a water pump, controlling the flow of a pipeline according to the preset regulating valve for detection, and spraying the end part area of the oil pit through a spray head;

(4) Recording data in a manual or camera shooting mode;

(5) After the detection is finished, the baffle is pulled out, the sealing door is opened, and the pebbles are discharged from the discharge opening;

(6) The dismounting device overturns the support frame 52, then places the dismounted first box body, second box body, shell, pipeline and all parts connected in series on the pipeline on the support frame 52, and pushes the parts to the storehouse for next use.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (8)

1. A sump pit overflow risk detection device for a converter station/substation,

comprises a first box body (1) for containing the mixed liquid of the transformer oil and the fire extinguishing medium;

comprises a second box body (2) for receiving the mixed liquid of the transformer oil and the fire extinguishing medium;

an oil pit of a local model with a reduced size is arranged above the second box body (2), the oil pit comprises a shell (4), the shell (4) is cuboid, and the upper side of the shell (4) is open;

a pipeline (3) is arranged between the first box body (1) and one end of the shell (4), a spray head (35) is arranged at one end, corresponding to the shell (4), of the pipeline (3), the spray head (35) is located above the end side of the shell (4), and a water pump (31), a pressure gauge (32), an adjusting valve (33) and a flow meter (34) are connected to the pipeline (3) in series;

the bottom of the other end, opposite to the spray head (35), of the shell (4) is communicated with a liquid discharge pipe (6), and the liquid discharge pipe (6) is positioned above an opening of the second box body (2); a pebble layer (41) is paved at the bottom of the shell (4).

2. The oil sump pit overflow risk detection device for the converter station/substation according to claim 1, wherein the drain pipe (6) is detachably mounted, the lower end of the drain pipe (6) is aligned with the opening of the second box body (2), the upper end of the drain pipe (6) is provided with a butt flange (61), the housing (4) is correspondingly provided with a drain hole (42), the circumferential side of the drain hole (42) is provided with a screw hole (43) for aligning with the butt flange (61), and the butt flange (61) and the screw hole (43) are fixedly mounted through a bolt (62).

3. The oil sump overflow risk detection device for the converter station/substation according to claim 2, characterized by further comprising a support frame (52), wherein a support plate (5) is fixed on the top of the support frame (52); the housing (4) is placed on a support plate (5); the second box body (2) is positioned in the support frame (52); the supporting plate (5) is provided with a through hole (51) for the liquid discharge pipe (6) to pass through, and the supporting frame (52) is of a frame type.

4. The oil collecting pit overflow risk detection device for the converter station/substation according to any one of claims 1 to 3, wherein a baffle (7) is inserted into one side of the outer shell (4) corresponding to the spray nozzle (35), a spray area is formed between the baffle (7) and the end side of the outer shell (4), and the spray nozzle (35) extends to the spray area; the bottom edge of the baffle is in contact with the upper surface of the pebble bed.

5. The oil collecting pit overflow risk detection device for the converter station/substation as claimed in claim 4, wherein the baffle (7) is detachably mounted on the housing (4), a fixture block (71) is arranged on the side of the housing (4), the fixture blocks (71) are symmetrically fixed on two sides of the housing (4), and are mounted relative to the side of the baffle (7), and a clamping groove clamped into the side of the baffle (7) is correspondingly formed in each fixture block (71).

6. The oil puddle overflow risk detection device for a converter station/substation according to any one of claims 1-3, characterized in that the single-sided side wall of the housing (4) is made of acrylic plates (44) of transparent material.

7. The oil collecting pit overflow risk detection device for the converter station/substation according to any one of claims 1 to 3, wherein a connecting pipe (11) is further communicated between the first box body (1) and the second box body (2), the connecting pipe (11) is connected with a valve (12) in series, and a frame (21) for protection and support is sleeved outside.

8. The oil sump overflow risk detection device for the converter station/substation according to claim 3, wherein universal wheels (521) are mounted at four corners of the support frame (52); turning the support frame (52) to form a movable container; the support frame (52) can accommodate the shell (4), the first box body (1), the second box body (2), the pipeline and all parts connected in series on the pipeline.

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