CN212410534U - Converter transformer oil pit fire insulation test platform - Google Patents

Abstract

The utility model discloses a converter transformer oil pit fire insulation test platform, which comprises a simulated overflow fire source, a flame-retardant fire insulation layer, a simulated oil conservator, a matched fire extinguishing system and a matched measurement and control system; the simulated overflow fire source comprises a simulated oil pit and an open oil pool, and the simulated oil pit is covered with a flame-retardant fire-proof layer. The utility model has the advantages that: the converter transformer oil pit fire insulation test platform reconstructs an accident oil pit fire scene caused by converter transformer overflow fire, the influence research of different flame-retardant fire insulation materials and different flame-retardant layer thicknesses on the flame-retardant fire insulation effect of the oil pit is realized, the influence research of a fire water fire extinguishing process on fire spread is realized, the risk research of the accident oil pit caused by overflow of an oil-water mixture in the fire water fire extinguishing process is realized, and the effectiveness and nozzle parameter optimization design research of a bottom layer fixed fire extinguishing system at the position of the protection accident oil pit is also realized.

Description

Converter transformer oil pit fire insulation test platform

Technical Field

The utility model relates to an electrical engineering field, concretely relates to converter transformer oil pit separates fire test platform.

Background

The converter station is an important junction of a power system, and is a station established for converting alternating current into direct current or converting direct current into alternating current in a high-voltage direct-current transmission system and meeting the requirements of the power system on safety, stability and power quality, and the safe and reliable operation of the converter station is the basis of the normal operation of the power system. The converter station contains a large amount of oil-containing equipment, such as a converter transformer, a high-voltage shunt reactor and the like, a base oil pit must be established, and a flame-retardant layer must be arranged in the oil pit of the oil-immersed electrical equipment to avoid potential safety hazards. The oil pit flame-retardant layer structure is used as a first protective barrier which is arranged in advance and used for ensuring quick penetration and safe isolation of the flammable transformer oil when the flammable transformer oil is discharged normally or discharged in an accident, so that the oil pit flame-retardant layer structure can quickly penetrate to prevent leaked high-temperature hot oil from gathering to form oil pool fire and flowing fire when a fire accident occurs, and can prevent flame from burning through the flame-retardant layer to enter the bottom of the oil pit and then spreading to adjacent converter flows to cause the accident expansion, and the oil pit flame-retardant layer structure is a main function of the oil pit flame-retardant layer structure of the converter transformer.

At present, researches on converter transformer fire mainly focus on risk analysis, monitoring and early warning, fire extinguishing technology and the like of converter transformer body fire, and less reconstruction is related to the fire-retardant fire-insulation test of an oil pit at the bottom of the converter transformer. The fire disaster model comprises a transformer body model, an oil collecting pit model, a fire spraying model, a fire trickling model and a high-voltage bushing explosion and crack model, wherein the oil collecting pit model, the fire spraying model, the fire trickling model and the high-voltage bushing explosion and crack model are constructed around the transformer body model, and the situation of the oil-immersed transformer during fire disaster is reflected by simulating various fire situations which are possibly generated when the transformer body fires; and moreover, the fire simulation is carried out through the oil-immersed transformer fire model, so that the validity of extinguishing the oil-immersed transformer fire by various fire extinguishing systems is verified. The reconstruction of the converter transformer oil pit fire is an important subject for solving the problems of converter transformer fire spreading and disaster causing: the testing of the flame retardance and fire insulation of the converter transformer oil pit is carried out, on one hand, the testing method can provide basis for the model selection of the converter transformer accident oil pit flame-retardant layer material, the design and protection of the optimized design of a bottom layer fixed fire extinguishing system nozzle at the accident oil pit and the like; on the other hand, the method is beneficial to fire investigation, disaster mechanism inversion, risk assessment and the like.

At present, the fireproof design of an oil pit of a converter transformer is mainly based on GB50229-2019 fireproof design standards for thermal power plants and substations: the thickness of the pebble layer designed on the fire-insulating layer of the oil pit is not less than 250mm, and the diameter of the pebble is preferably 50-80 mm. However, the recent typical case of converter transformer fire accident shows that the requirement cannot meet the requirement of flame retarding and fire isolating in the case of fire of large oil-filled equipment, fuel oil is easy to gather to form oil pool fire and flowing fire, and meanwhile, the risk of accident expansion caused by the spread of high-temperature oil through an oil pit exists. Therefore, it is urgently needed to develop a converter transformer accident oil pit fire insulation performance test and provide support for the converter transformer oil pit fire disaster mechanism research and the flame retardant layer design.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a converter transformer oil pit separates fire test platform can reconstruct the accident oil pit conflagration scene that probably causes behind the converter transformer fire disaster, realizes different fire-retardant fire material, the research of different fire-retardant layer thickness to the fire-retardant fire effect that separates of oil pit to and different fire-retardant material permeability research. And the comprehensive system research can be carried out on the aspects of the research on the overflow risk of the oil-water mixture of the accident oil pit, the fire spreading risk, the effectiveness of various fire suppression technologies and the like in the fire extinguishing process.

The utility model discloses a realize solving above-mentioned technical problem through following technical means: a converter transformer oil pit fire insulation test platform comprises a simulated overflow fire source, a flame-retardant fire insulation layer, a simulated oil conservator, a matched fire extinguishing system and a matched measurement and control system;

the simulated overflow fire source comprises a simulated oil pit and an open oil pool arranged above the simulated oil pit, the simulated oil pit leads to an external accident oil collecting pool, the simulated oil pit is covered with the flame-retardant fire-insulating layer, and the flame-retardant fire-insulating layer is positioned below the open oil pool;

the simulation oil conservator comprises a simulation oil conservator cavity and an oil conservator heating device arranged in the simulation oil conservator cavity, and the simulation oil conservator cavity is communicated with the opening oil pool;

the matched measurement and control system comprises an ignition system capable of igniting the open oil sump, a temperature acquisition system capable of acquiring the temperature of the simulated overflow fire source and the temperature of the simulated conservator, an image acquisition system capable of acquiring the internal image of the simulated oil sump and the image of the simulated overflow fire source, and a flow acquisition system capable of acquiring the flow of the simulated conservator leading to the open oil sump and the flow of the simulated oil sump leading to the peripheral accident oil sump.

The utility model provides a converter transformer oil pit fire insulation test platform is when the actual application, conservator heating device preheats the transformer oil in the simulation conservator cavity, so that follow-up burning, preheated transformer oil pours into the opening oil bath, ignition system lights the transformer oil in the opening oil bath, transformer oil continuously pours into the opening oil bath, burning transformer oil overflows from the opening oil bath, and then simulation overflow fire source, fire-retardant fire insulation layer is used for stopping burning and preventing the fire that flows into the simulation oil pit, the transformer oil that flows into the simulation oil pit leads to the accident oil collecting tank of peripheral hardware, in the test process, according to the condition of fire, can put out a fire through supporting fire extinguishing system, temperature acquisition system gathers simulation overflow fire source temperature and simulation conservator temperature, image acquisition system gathers simulation oil pit internal image and simulation overflow fire source image, the flow acquisition system acquires flow of a simulation conservator cavity leading to an open oil pool and flow of a simulation oil pit leading to an external accident oil collecting pool, and further simulates three scenes of high-temperature hot oil flowing to the surface of the oil pit, fire on the surface of the oil pit and fire at the bottom of the oil pit after the transformer bushing is cracked, so that the development and evolution process of high-temperature hot oil fire of the converter transformer fire can be truly reproduced, and in the aspects of flame-retardant fire-isolation test and fire protection of the oil pit of the converter transformer, a test platform can realize the test of the flame-retardant fire-isolation materials and the flame-retardant layer thicknesses in the oil pit under the scene of the converter transformer fire, and the test of the permeability of different flame-retardant materials, thereby providing a basis for the type selection, design and; in the aspect of evaluating the spreading risk of the converter transformer oil pit fire, the test platform can realize the research on the influence of the fire-fighting water fire-fighting process on the fire spreading, the research on the risk of the oil-water mixture overflowing the oil pit in the fire-fighting water fire-fighting process, and also can provide a basis for protecting the optimal design of a fixed fire-fighting system nozzle; therefore, the test platform is specially used for carrying out comprehensive system reconstruction in the process of generating, developing and spreading oil pit fire caused by converter transformer overflow fire, can simultaneously realize the test of fire insulation effect of the fire-retardant fire insulation layer, the test of permeability of different fire-retardant materials, the test of risk of spreading or overflowing oil pit of oil-water mixture in the fire-fighting process, the test and evaluation of the performance of a fixed fire-extinguishing system and the like, can truly reproduce the development process of high-temperature hot oil fire of converter transformer fire, and simultaneously ensures the repeatability of the test.

Preferably, the opening oil pool is a cuboid with an opening at the top, at least two simulation oil spilling grooves are formed in the long side walls of the two sides of the opening oil pool, the horizontal distance between every two adjacent simulation oil spilling grooves is equal, the positions where the simulation oil spilling grooves are located are gradually increased along the length direction of the opening oil pool, and the vertical distance between every two adjacent simulation oil spilling grooves is equal.

In the aspect of converter transformer fire scene design, the test platform designs a plurality of simulated oil overflow grooves with different heights to simulate different numbers of sleeve explosion overflow fire scenes, including three scenes of high-temperature hot oil flowing to the surface of an oil pit, fire on the surface of the oil pit and fire at the bottom of the oil pit after the sleeves with different numbers are exploded, and can truly reproduce the development and evolution process of the high-temperature hot oil of the converter transformer fire.

Optimized, the opening oil pool is a cuboid with an opening at the top, and the projection of the opening oil pool in the vertical direction is located in the range of the simulated oil pit.

Preferably, the flame-retardant fire-insulating layer comprises a steel fixing net and a flame-retardant fire-insulating material arranged in the steel fixing net;

a support frame is arranged in the simulation oil pit, the steel fixing net is arranged on the support frame, and the steel fixing net covers the simulation oil pit.

In the actual test process, can change different types of fire-retardant fire material that separates in the steel fixed network to lay different thickness, and then test the fire-retardant fire effect that separates of the fire-retardant fire layer of different types and thickness, simple structure, simple to operate.

Preferably, the length, the width and the height of the simulation conservator are respectively 5-8m, 1-2m and 2-3m, the transformer oil in the simulation conservator is one of KI-50X, K25, the oil quantity in the simulation conservator is 2-8t, and the bottom of the simulation conservator is at least 0.5m higher than the top of the opening oil pool.

Optimized, supporting fire extinguishing systems is including fixed water spraying fire extinguishing systems, portable water fire engine, and fixed water spraying fire extinguishing systems can spout to fire-retardant fire insulation layer, portable water fire engine can spout to the opening oil bath.

Optimally, the fixed water spraying fire extinguishing system comprises two rows of spray heads which are symmetrically arranged at two sides of the flame-retardant fire-insulating layer, the spray heads horizontally face the flame-retardant fire-insulating layer, each row of spray heads is 0.3-0.5m away from the edge of the flame-retardant fire-insulating layer, the distance between two adjacent spray heads in each row of spray heads is 0.6-1.5m, and the distance between the spray heads and the ground is 0.5-1.0 m;

the distance between the movable water fire truck and the flame-retardant fire-insulating layer is 5-10m, and the water carrying capacity is 6-10 t.

Optimally, the temperature acquisition system comprises an infrared camera which is arranged 4-8m away from the edge of the flame-retardant fire-proof layer, and the distance between the infrared camera and the ground is 2.5-3.5 m;

the thermocouple is arranged in the opening oil pool and the simulation conservator;

the temperature data acquisition system is connected with the infrared camera and the thermocouple.

The infrared camera can record the testing process and gather the temperature data in the testing process, and the thermocouple is arranged in detecting the temperature in opening oil bath and the simulation conservator, and temperature data acquisition system is used for gathering and storing infrared camera, thermocouple record or the information that detects.

Optimally, the image acquisition system comprises two ground cameras which are arranged on two sides of the flame-retardant fire-proof layer;

the high-definition video camera is arranged in the simulated oil pit, and the miniature camera is arranged in a channel leading from the simulated oil pit to the peripheral accident oil collecting pool;

the system also comprises a multi-channel video data acquisition system connected with the ground camera, the high-definition video camera and the miniature camera.

The ground camera records the external fire condition, the high-definition video camera records the fire condition in the simulated oil pit, the micro camera is used for observing whether the simulated oil pit is led to the channel of the peripheral accident oil collecting pool to flow smoothly, and the multi-channel video data acquisition system is used for recording and storing the video of the ground camera, the high-definition video camera and the micro camera.

Optimally, the flow acquisition system comprises a flow indicator probe which is arranged in a channel of a simulation conservator cavity leading to an open oil pool and a channel of a simulation oil pit leading to an accident oil pool arranged outside;

and the flow data acquisition system is connected with the flow indicator probe.

The flow indicator probe detects the flow of the simulation conservator cavity in a channel leading to the open oil pool and the flow of the simulation oil pit in an accident oil collecting pool channel leading to the peripheral equipment, and the flow data acquisition system acquires and records the flow.

The utility model has the advantages that:

1. the utility model provides a converter transformer oil pit fire insulation test platform is when the actual application, conservator heating device preheats the transformer oil in the simulation conservator cavity, so that follow-up burning, preheated transformer oil pours into the opening oil bath, ignition system lights the transformer oil in the opening oil bath, transformer oil continuously pours into the opening oil bath, burning transformer oil overflows from the opening oil bath, and then simulation overflow fire source, fire-retardant fire insulation layer is used for stopping burning and preventing the fire that flows into the simulation oil pit, the transformer oil that flows into the simulation oil pit leads to the accident oil collecting tank of peripheral hardware, in the test process, according to the condition of fire, can put out a fire through supporting fire extinguishing system, temperature acquisition system gathers simulation overflow fire source temperature and simulation conservator temperature, image acquisition system gathers simulation oil pit internal image and simulation overflow fire source image, the flow acquisition system acquires flow of a simulation conservator cavity leading to an open oil pool and flow of a simulation oil pit leading to an external accident oil collecting pool, and further simulates three scenes of high-temperature hot oil flowing to the surface of the oil pit, fire on the surface of the oil pit and fire at the bottom of the oil pit after the transformer bushing is cracked, so that the development and evolution process of high-temperature hot oil fire of the converter transformer fire can be truly reproduced, and in the aspects of flame-retardant fire-isolation test and fire protection of the oil pit of the converter transformer, a test platform can realize the test of the flame-retardant fire-isolation materials and the flame-retardant layer thicknesses in the oil pit under the scene of the converter transformer fire, and the test of the permeability of different flame-retardant materials, thereby providing a basis for the type selection, design and; in the aspect of evaluating the spreading risk of the converter transformer oil pit fire, the test platform can realize the research on the influence of the fire-fighting water fire-fighting process on the fire spreading, the research on the risk of the oil-water mixture overflowing the oil pit in the fire-fighting water fire-fighting process, and also can provide a basis for protecting the optimal design of a fixed fire-fighting system nozzle; therefore, the test platform is specially used for carrying out comprehensive system reconstruction in the process of generating, developing and spreading oil pit fire caused by converter transformer overflow fire, can simultaneously realize the test of fire insulation effect of the fire-retardant fire insulation layer, the test of permeability of different fire-retardant materials, the test of risk of spreading or overflowing oil pit of oil-water mixture in the fire-fighting process, the test and evaluation of the performance of a fixed fire-extinguishing system and the like, can truly reproduce the development process of high-temperature hot oil fire of converter transformer fire, and simultaneously ensures the repeatability of the test.

2. In the aspect of converter transformer fire scene design, the test platform designs a plurality of simulated oil overflow grooves with different heights to simulate different numbers of sleeve explosion overflow fire scenes, including three scenes of high-temperature hot oil flowing to the surface of an oil pit, fire on the surface of the oil pit and fire at the bottom of the oil pit after the sleeves with different numbers are exploded, and can truly reproduce the development and evolution process of the high-temperature hot oil of the converter transformer fire.

3. In the actual test process, can change different types of fire-retardant fire material that separates in the steel fixed network to lay different thickness, and then test the fire-retardant fire effect that separates of the fire-retardant fire layer of different types and thickness, simple structure, simple to operate.

4. The infrared camera can record the testing process and gather the temperature data in the testing process, and the thermocouple is arranged in detecting the temperature in opening oil bath and the simulation conservator, and temperature data acquisition system is used for gathering and storing infrared camera, thermocouple record or the information that detects.

5. The ground camera records the external fire condition, the high-definition video camera records the fire condition in the simulated oil pit, the micro camera is used for observing whether the simulated oil pit is led to the channel of the peripheral accident oil collecting pool to flow smoothly, and the multi-channel video data acquisition system is used for recording and storing the video of the ground camera, the high-definition video camera and the micro camera.

6. The flow indicator probe detects the flow of the simulation conservator cavity in a channel leading to the open oil pool and the flow of the simulation oil pit in an accident oil collecting pool channel leading to the peripheral equipment, and the flow data acquisition system acquires and records the flow.

Drawings

Fig. 1 is a schematic structural diagram of a converter transformer oil pit fire insulation test platform in the embodiment of the utility model;

FIG. 2 is a schematic diagram of an embodiment of the present invention illustrating an overflow fire source;

fig. 3 is a schematic view of a support frame in an embodiment of the present invention;

FIG. 4 is a schematic view of a flame-retardant layer according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a simulation conservator in an embodiment of the present invention;

fig. 6 is a schematic view of the arrangement of a high-definition video camera for simulating the bottom of an oil pit in the embodiment of the present invention;

FIG. 7 is a schematic diagram of the arrangement of the fire extinguishing system and the ground camera according to the embodiment of the present invention;

wherein the content of the first and second substances,

simulated overflow fire source-1, simulated oil pit-11, open oil pool-12, support frame-111, oil discharge pipeline-112 and simulated oil overflow tank-121;

a flame-retardant fire-insulating layer-2, a steel fixing net-21 and a flame-retardant fire-insulating material-22;

a simulated oil conservator-3, a simulated oil conservator cavity-31, an oil conservator heating device-32 and an oil pipeline-33;

a matched fire extinguishing system-4, a fixed water spraying fire extinguishing system-41, a movable water fire truck-42 and a spray head-411;

the system comprises a matched measurement and control system-5, an ignition system-51, a temperature acquisition system-52, an image acquisition system-53, a flow acquisition system-54, an infrared camera-521, a thermocouple-522, a ground camera-531, a high-definition video camera-532, a miniature camera-533, a flow indicator probe-541 and a flow control valve-542.

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.

The first embodiment is as follows:

as shown in fig. 1 and 7, the converter transformer oil pit fire insulation test platform comprises a simulated overflow fire source 1, a flame-retardant fire insulation layer 2, a simulated oil conservator 3, a matched fire extinguishing system 4 and a matched measurement and control system 5.

For convenience of description and understanding, the perspective of fig. 1 is taken as the front view perspective, and the rest of the orientations are taken as the reference.

As shown in fig. 1, the simulated overflow fire source 1 includes a simulated oil pit 11, and an open oil sump 12 disposed above the simulated oil pit 11, the simulated oil pit 11 leads to an external accident oil sump (not shown in the figure), the simulated oil pit 11 leads to the external accident oil sump by connecting through an oil discharge pipeline 112, the oil discharge pipeline 112 is made of stainless steel and seamless welded steel pipe, and the pipe diameter is not less than DN 60. The flame-retardant fire-insulating layer 2 covers the simulated oil pit 11, and the flame-retardant fire-insulating layer 2 is positioned below the open oil pool 12, in the embodiment, the simulated oil pit 11 is arranged on the ground.

As shown in fig. 2, the open oil sump 12 is a rectangular parallelepiped with an open top, and at least two simulated oil spilling grooves 121 are formed on the long side walls on both sides of the open oil sump 12, in this embodiment, three simulated oil spilling grooves 121 are formed on the long side wall on each side of the open oil sump 12, the length of each simulated oil spilling groove 121 is 0.6m, the depth of each simulated oil spilling groove 121 is 0.1m, the horizontal distance between two adjacent simulated oil spilling grooves 121 is equal, the positions where the simulated oil spilling grooves 121 are located are gradually increased along the length direction of the open oil sump 12, the vertical distance between the central points of the two adjacent simulated oil spilling grooves 121 is equal, and the vertical distances from the top of the open oil sump 12 to the central points of the three simulated oil spilling grooves 121 are respectively 0.25m, 0.15 m.

As shown in fig. 1, the projection of the open oil pool 12 in the vertical direction is located within the range of the simulated oil pit 11, the length, width and height of the open oil pool 12 are respectively 3m, 1m and 0.5m, the length direction of the open oil pool 12 is along the left-right direction, the bottom of the open oil pool 12 is 3.5m away from the ground, the distance between the four sides of the open oil pool 12 and the four sides corresponding to the simulated oil pit 11 is 2-3m, in this embodiment, the distance between the four sides of the open oil pool 12 and the four sides corresponding to the simulated oil pit 11 is 2m, and the open oil pool 12 is fixed above the simulated oil pit 11 through a bracket.

As shown in fig. 1 and 4, the flame-retardant fire-barrier layer 2 comprises a steel fixing net 21 and a flame-retardant fire-barrier material 22 arranged in the steel fixing net 21; the aperture size of the mesh of the steel fixing net 21 is 10-20mm, the steel fixing net 21 can be woven by steel wires, and a sheet-shaped steel grating is manufactured according to the set specification and size. The flame-retardant fire-insulating material 22 can be cobblestones or novel ceramic foam glass particles, and the particle size range of the flame-retardant fire-insulating material 22 is 25-100 mm.

As shown in fig. 3, a support frame 111 is disposed in the simulated oil pit 11, the support frame 111 is a steel support structure, a main frame around the support frame is embedded into four walls of the simulated oil pit 11, the embedding depth is not less than 0.1m, and the surface bearing capacity of the support frame 111 is not less than 600kg/m²Said steel being fixedThe fixed net 21 is arranged on the support frame 111, and the steel fixed net 21 covers the simulated oil pit 11, specifically, the steel grids encapsulating the flame-retardant fire-proof material 22 are connected with each other through the support frame 111 to cover the upper part of the simulated oil pit 11, the thickness of the flame-retardant fire-insulating layer 2 is changed by presetting steel grids with different packaging thicknesses, and in specific implementation, only one layer of steel grating can be laid on the support frame 111, and the spaces between the steel grating and the four walls of the simulated oil pit 11 are filled with the flame-retardant fire-insulating materials 22 with different thicknesses, in addition, while one layer of steel grating is laid on the support frame 111, four steel grids are arranged around the steel grid at the bottom, the space surrounded by the steel grids is filled with flame-retardant fire-proof materials 22, the top of the fire retardant and fire insulating material 22 is then sealed with steel grids, which may be bolted or wired together.

As shown in fig. 5, the simulated conservator 3 includes a simulated conservator cavity 31 and an conservator heating device 32 disposed in the simulated conservator cavity 31, the conservator heating device 32 is an electric arc electric heating device, the electric arc electric heating device is heated by heating wire circulation, and the heating power range is 5-50 kW. Simulation conservator cavity 31 accesss to opening oil bath 12, simulation conservator cavity 31 accesss to opening oil bath 12 and connects the realization through defeated oil pipe way 33, and defeated oil pipe way 33 adopts stainless steel seamless welding steel pipe, and the pipe diameter is not less than DN 60. The flow control valve 542 is arranged in the oil pipeline 33 leading from the simulated conservator cavity 31 to the opening oil pool 12, the flow control valve 542 is manual or automatic, when the flow control valve 542 is set to be automatic, the flow control valve 542 can adopt an electric butterfly valve, and a PLC and the like can be arranged outside to control the flow control valve 542.

The length, the width and the height of the simulation conservator 3 are respectively 5-8m, 1-2m and 2-3m, the length, the width and the height of the simulation conservator 3 are respectively 5m, 1m and 2m in the embodiment, the length direction of the simulation conservator 3 is along the front-back direction, transformer oil in the simulation conservator 3 is one of KI-50X, K25, the oil amount in the simulation conservator 3 is 2-8t, the oil amount in the embodiment is 2t, the bottom of the simulation conservator 3 is at least 0.5m higher than the top of the open oil pool 12, and the simulation conservator 3 is erected above the ground through a support.

As shown in fig. 7, the fire extinguishing system 4 includes a fixed water spraying fire extinguishing system 41 and a movable water fire truck 42, the fixed water spraying fire extinguishing system 41 can spray to the flame-retardant fire-insulating layer 2, the movable water fire truck 42 can spray to the open oil sump 12, an additional interface is reserved in the converter transformer oil sump fire-insulating test platform, and the additional interface can be used for setting other types of fire extinguishing systems in the platform, and the reserved interface can be closed in a non-use state.

As shown in fig. 7, the fixed water spray fire-extinguishing system 41 comprises two rows of nozzles 411 symmetrically arranged at the front and the rear sides of the flame-retardant fire-insulating layer 2, the nozzles 411 are horizontally oriented to the flame-retardant fire-insulating layer 2, each row of nozzles 411 is 0.3-0.5m, in this embodiment 0.3m, each row is provided with 6 nozzles 411, the nozzles 411 are medium-speed water spray nozzles, in each row of nozzles 411, the distance between two adjacent spray nozzles 411 is 0.6-1.5m, in this embodiment 0.6m, the distance between the spray nozzles 411 and the ground is 0.5-1.0m, in this embodiment 0.5m, the fixed water spraying fire extinguishing system 41 can be controlled by a control unit such as a PLC, the distance between the movable water fire truck 42 and the flame-retardant fire-insulating layer is 5-10m, in this embodiment 5m, the water carrying amount is 6-10t, in this embodiment 6t, and the movable water fire truck 42 is positioned on the left side of the flame-retardant fire-insulating layer 2.

As shown in fig. 1 and 2, the measurement and control system 5 includes an ignition system 51 capable of igniting the open oil sump 12, a temperature acquisition system 52 capable of acquiring the temperature of the simulated overflow fire source 1 and the temperature of the simulated conservator 3, an image acquisition system 53 capable of acquiring the image inside the simulated oil sump 11 and the image of the simulated overflow fire source 1, and a flow acquisition system 54 capable of acquiring the flow of the simulated conservator cavity 31 leading to the open oil sump 12 and the flow of the simulated oil sump 11 leading to the external accident oil sump.

As shown in fig. 2, the ignition system 51 employs an arc ignition device, which is a prior art device, and is disposed at an opening of the open oil sump 12.

The whole test can be controlled by a control unit which can adopt a PLC (programmable logic controller) which is the prior art, and the corresponding control can be realized by programming according to the requirement by the technical personnel in the field.

The electric arc ignition device is controlled by a PLC, power-on ignition or power-off ignition stopping are realized by controlling the on-off of a power supply of the electric arc ignition device, and the on-off of the power supply of the electric arc ignition device can realize remote automatic control.

As shown in fig. 1, the temperature collecting system 52 includes an infrared camera 521 which is positioned 4-8m away from the edge of the fire-retardant layer 2, in this embodiment 4m, the infrared camera 521 is 2.5-3.5m away from the ground, in this embodiment 2.5m, and the infrared camera 521 is positioned at the left side of the fire-retardant layer 2.

As shown in fig. 2 and 5, the oil conservator also comprises a thermocouple 522 arranged in the opening oil pool 12 and the simulation oil conservator 3; thermocouples 522 all adopt high-precision K-type thermocouples, and the positions of the thermocouples 522 in the open oil pool 12 are as follows: the thermocouples 522 are arranged on the left side wall and the right side wall of the open oil pool 12, three thermocouples are arranged on each side wall, one thermocouple is arranged at the middle position of the front side and the middle position of the rear side of each side wall, one thermocouple is arranged at a position which is 0.2m away from the middle thermocouple 522 in the front and the rear side, and the heights of the six thermocouples 522 in the open oil pool 12 are equal.

As shown in fig. 5, the thermocouples 522 in the simulated conservator 3 are arranged at the central position of the front and back surfaces of the simulated conservator cavity 31 and one each at a position which is 0.15m away from the central position horizontally from the left and right sides, and the heights of all the thermocouples 522 in the simulated conservator 3 are equal.

The temperature monitoring device further comprises a temperature data acquisition system connected with the infrared camera 521 and the thermocouple 522, wherein the temperature data acquisition system is in the prior art and can display and record temperature values detected by the infrared camera 521 and the thermocouple 522.

As shown in fig. 7, the image capturing system 53 includes two ground cameras 531 disposed on the front and rear sides of the flame-retardant fire-barrier layer 2, the two ground cameras 531 are 5m away from the edge of the flame-retardant fire-barrier layer 2, and the heights of the two ground cameras 531 from the ground are 3m and 8m, respectively, and are used for observing the combustion condition of the simulated oil pit 11 and finishing the combustion condition.

As shown in fig. 6, a high-definition video camera 532 disposed in the simulated oil sump 11 and a micro-camera 533 disposed in the passage from the simulated oil sump 11 to the external accident oil sump are also included.

As shown in fig. 1 and 6, the high definition video cameras 532 in the simulated oil sump 11 are specifically distributed as follows: the left side of a simulated oil pit 11 below the flame-retardant fire-barrier layer 2 is provided with a first high-definition video camera 532 (observing a fire point in the right direction), the right side of the simulated oil pit 11 is provided with a second high-definition video camera 532 (observing the position of an oil outlet of the simulated oil pit 11 below), the left front side of the simulated oil pit 11 is provided with a third high-definition video camera 532 (observing a fire point in the right rear direction), the front side of the simulated oil pit 11 is provided with a fourth high-definition video camera 532 (observing a fire point in the right rear direction), the right rear direction of the simulated oil pit 11 is provided with a fifth high-definition video camera 532 (observing a fire point in the left front direction), and the flame combustion condition at the bottom of the flame-retardant fire-barrier layer 2 in the shooting test.

As shown in fig. 6, the micro-camera 533 is disposed in the oil drain line 112 and is away from the oil drain port of the oil drain line 112 (i.e., the oil drain port 5m of the simulated oil sump 11), and the micro-camera 533 photographs the water drained from the line during the test. All cameras in this embodiment all adopt high temperature resistant cameras.

The system is characterized by further comprising a multi-channel video data acquisition system connected with the ground camera 531, the high-definition video camera 532 and the micro camera 533, wherein the multi-channel video data acquisition system is in the prior art and can record pictures shot by the ground camera 531, the high-definition video camera 532 and the micro camera 533.

As shown in fig. 1, the flow collection system 54 includes a flow indicator probe 541 disposed in the passage of the simulated conservator cavity 31 to the open oil sump 12 and the simulated oil sump 11 to the peripheral accident sump passage; specifically, the flow indicator probe 541 in the oil drain line 112 is disposed 0.2m from the oil drain port of the oil drain line 112. The flow rate indicator probe 541 detects the flow rate and transmits a signal to the external control system, and the external control system controls the opening degree of the flow control valve 542, so that the flow rate is controlled.

Also included is a flow data acquisition system connected to the flow indicator probe 541, which is prior art and is capable of acquiring the amount of flow detected by the flow indicator probe 541.

The working principle is as follows:

as shown in fig. 1, in the testing platform for testing the fire insulation of the converter transformer oil sump in the present invention, when in actual application, the conservator heating device 32 preheats the transformer oil in the simulated conservator cavity 31 to facilitate the subsequent combustion, the preheated transformer oil is injected into the open oil sump 12, the ignition system 51 ignites the transformer oil in the open oil sump 12, the transformer oil is continuously injected into the open oil sump 12, the combusted transformer oil overflows from the open oil sump 12 to simulate the overflow fire source, the flame-retardant fire-insulating layer 2 is used to prevent the combustion and prevent the fire from flowing into the simulated oil sump 11, the transformer oil flowing into the simulated oil sump 11 leads to the accident oil sump of the peripheral equipment, during the testing process, according to the fire situation, the fire can be extinguished through the fixed water spraying fire extinguishing system 41 and the mobile water fire truck 42, the temperature acquisition system 52 acquires the temperature of the simulated overflow fire source 1 and the temperature of the simulated conservator 3, the image acquisition system 53 acquires images inside the simulated oil pit 11 and images of the simulated overflow fire source 1, the flow acquisition system 54 acquires three scenes, namely flow of the simulated conservator cavity 31 leading to the open oil pool 12 and flow of the simulated oil pit 11 leading to an external accident oil collection pool, and then high-temperature hot oil flows to the surface of the oil pit, surface fire of the oil pit and bottom fire of the oil pit after the casing of the simulated transformer is cracked, so that the development and evolution process of high-temperature hot oil fire of the converter transformer fire can be truly reproduced, and in the aspects of flame-retardant fire-isolation test and fire protection of the oil pit of the converter transformer, the test platform can realize the test of the flame-retardant fire-isolation materials and the flame-retardant layer thicknesses in the oil pit under the scene of the converter transformer fire, and the test of the permeability of the different flame-retardant materials, so as to provide basis for the selection; in the aspect of evaluating the spreading risk of the converter transformer oil pit fire, the test platform can realize the research on the influence of the fire-fighting water fire-fighting process on the fire spreading, the research on the risk of the oil-water mixture overflowing the oil pit in the fire-fighting water fire-fighting process, and also can provide a basis for protecting the optimal design of a fixed fire-fighting system nozzle; therefore, the test platform is specially used for carrying out comprehensive system reconstruction in the process of generating, developing and spreading oil pit fire caused by converter transformer overflow fire, can simultaneously realize the test of fire insulation effect of the fire-retardant fire insulation layer, the test of permeability of different fire-retardant materials, the test of risk of spreading or overflowing oil pit of oil-water mixture in the fire-fighting process, the test and evaluation of the performance of a fixed fire-extinguishing system and the like, can truly reproduce the development process of high-temperature hot oil fire of converter transformer fire, and simultaneously ensures the repeatability of the test.

Example two:

the utility model provides a converter transformer oil pit separates fire test platform's concrete test method as follows, including following step:

firstly, according to the structure of the first embodiment, in this embodiment, the fire-retardant layer 2 is set to 250mm, and when the pebbles are selected as the internal fire-retardant layer 22, the particle size is in the range of 50-80mm, or new ceramic foam glass particles are adopted, the particle size is in the range of 25-60mm, and in this embodiment, the pebbles with the particle size of 50mm are adopted.

The high definition video camera 532 is debugged to ensure normal operation, and in addition, the infrared camera 521 and the ground camera 531 are aligned to the position to be shot, and all pictures are output to an external display.

The following steps are then carried out:

s1, simulating oil injection of an oil conservator and preheating:

closing a channel of the simulated conservator cavity 31 leading to the open oil sump 12, specifically, manually closing the flow control valve 542, injecting transformer oil into the simulated conservator cavity 31, and filling the simulated conservator cavity 31, wherein the weight of the transformer oil in the simulated conservator cavity 31 is 8t, and preheating the transformer oil by using the conservator heating device 32, wherein the preheating temperature is determined according to the requirement in the actual test and the type of the transformer oil;

s2, filling oil into the open oil pool:

injecting the preheated transformer oil in the simulation conservator cavity 31 into the open oil pool 12, and simulating that the ignition starting time meets the requirements of table 1 when different numbers of sleeves are cracked and overflowed;

TABLE 1 simulation of ignition timing requirements for different numbers of casings during burst flooding

s3, open sump firing:

according to the number of the simulation sleeves, when the requirements of the table 1 are met, igniting the transformer oil in the open oil pool 12 by using the ignition system 51, continuously injecting the transformer oil into the open oil pool 12, and remotely controlling to close the ignition system 51 when flame continuously and autonomously burns for no less than 20 s;

s4, flow record:

starting timing from the turning-off of the ignition system 51, recording the flow of a channel leading from the simulation conservator cavity 31 to the open oil sump 12 every t, namely reading of a remote display of a flow indicator probe 541 in the oil pipeline 33, wherein t is not more than 15s, and simultaneously observing and recording the change conditions of the fire behaviors of the upper part and the lower part of the flame-retardant fire-proof layer 2 in the process that the open oil sump 12 overflows and flows into the simulation oil sump 11, for example, if the bottom of the simulation oil sump 11 catches fire, observing whether the fire behavior enters the simulation oil sump 11 into an oil discharge pipeline 112 leading to an external accident oil sump;

s5, fire extinguishing by the flame-retardant fire-proof layer:

if the bottom of the simulated oil pit 11 catches fire, the fixed water spraying fire extinguishing system 41 is started to cool the fire spot on the upper part of the flame-retardant fire-insulating layer 2, the fire situation on the upper part of the flame-retardant fire-insulating layer 2 of the simulated oil pit 11 is observed through the ground camera 531 in the image acquisition system 53, and the fire situation on the lower part of the simulated oil pit 11 is observed through the high-definition video camera 532;

s6, open oil pool fire extinguishing:

when the bottom of the flame-retardant fire-barrier layer 2 is confirmed to be on fire (from the end of ignition to the time of ignition at the bottom of the flame-retardant fire-barrier layer 2, namely the failure time of the flame-retardant fire-barrier layer 2), the movable water fire truck 42 is started to extinguish the fire of the open oil pool 12, the water flow is 10-20L/s and lasts for 10-20min, 6000-plus-water 24000L is sprayed, the infrared camera 521 in the temperature acquisition system 52 records the temperature and the fire behavior of the open oil pool 12, the ground camera 531 in the image acquisition system 53 records the fire extinguishing process, the fire behavior change condition and whether an oil-water mixture overflows to the ground around the open oil pool 12, the high-definition video camera 532 and the micro camera 533 observe whether the drainage at the lower part of the simulated oil pit 11 is smooth, and the flow of the simulated oil pit 11 to an oil collecting pool for an external;

s7, closing the test platform:

after the open oil pool 12 and the open fire on the upper part and the lower part of the flame-retardant fire-insulating layer 2 are completely extinguished, closing a channel of the simulated conservator cavity 31 leading to the open oil pool 12, namely closing the flow control valve 542, continuously spraying the fixed water spraying fire extinguishing system 41 and the mobile fire truck 42 until the temperature of the oil in the open oil pool 12 is reduced to be below 100 ℃, continuously spraying for 10-30s to finish spraying, ending the test, closing the matched measurement and control system 5, storing data, pictures and videos, and cleaning the open oil pool 12 and the simulated oil pit 11 after the transformer oil is cooled to the normal temperature;

s8, replacing the flame-retardant fire-insulating layer 2 with different thicknesses and different flame-retardant fire-insulating materials, and repeating the steps s1-s7 to realize the fire-insulating test of the flame-retardant fire-insulating layer 2 with different thicknesses and different flame-retardant fire-insulating materials.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art 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 (10)

1. The utility model provides a converter transformer oil pit separates fire test platform which characterized in that: comprises a simulated overflow fire source (1), a flame-retardant fire-insulating layer (2), a simulated oil conservator (3), a matched fire extinguishing system (4) and a matched measurement and control system (5);

the simulated overflow fire source (1) comprises a simulated oil pit (11) and an open oil pool (12) arranged above the simulated oil pit (11), the simulated oil pit (11) leads to an external accident oil collecting pool, the flame-retardant fire-insulating layer (2) covers the simulated oil pit (11), and the flame-retardant fire-insulating layer (2) is positioned below the open oil pool (12);

the simulation oil conservator (3) comprises a simulation oil conservator cavity (31) and an oil conservator heating device (32) arranged in the simulation oil conservator cavity (31), and the simulation oil conservator cavity (31) leads to the opening oil pool (12);

the supporting measurement and control system (5) comprises an ignition system (51) capable of igniting the open oil pool (12), a temperature acquisition system (52) capable of acquiring the temperature of the simulated overflow fire source (1) and the temperature of the simulated oil conservator (3), an image acquisition system (53) capable of acquiring the internal image of the simulated oil sump (11) and the image of the simulated overflow fire source (1), and a flow acquisition system (54) capable of acquiring the flow of the simulated oil conservator cavity (31) leading to the open oil pool (12) and the flow of the simulated oil sump (11) leading to the peripheral accident oil sump.

2. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the opening oil pool (12) is a cuboid with an opening at the top, at least two simulated oil overflow grooves (121) are formed in the long side walls of the two sides of the opening oil pool (12), the horizontal distance between every two adjacent simulated oil overflow grooves (121) is equal, the positions where the simulated oil overflow grooves (121) are located are gradually increased along the length direction of the opening oil pool (12), and the vertical distances between every two adjacent simulated oil overflow grooves (121) are equal.

3. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the opening oil pool (12) is a cuboid with an opening at the top, and the projection of the opening oil pool (12) in the vertical direction is positioned in the range of the simulated oil pit (11).

4. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the flame-retardant fire-insulating layer (2) comprises a steel fixing net (21) and a flame-retardant fire-insulating material (22) arranged in the steel fixing net (21);

a supporting frame (111) is arranged in the simulated oil pit (11), the steel fixing net (21) is arranged on the supporting frame (111), and the simulated oil pit (11) is covered by the steel fixing net (21).

5. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the length, the width and the height of the simulation conservator (3) are respectively 5-8m, 1-2m and 2-3m, transformer oil in the simulation conservator (3) is one of KI-50X, K25, the oil quantity in the simulation conservator (3) is 2-8t, and the bottom of the simulation conservator (3) is at least 0.5m higher than the top of the open oil pool (12).

6. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: supporting fire extinguishing systems (4) are including fixed water spraying fire extinguishing systems (41), portable water fire engine (42), and fixed water spraying fire extinguishing systems (41) can be spouted to fire-retardant fire insulation layer (2), portable water fire engine (42) can be spouted to opening oil bath (12).

7. The converter transformer oil pit fire insulation test platform according to claim 6, characterized in that: the fixed water spraying fire extinguishing system (41) comprises two rows of nozzles (411) symmetrically arranged at two sides of the flame-retardant fire-insulating layer (2), the nozzles (411) horizontally face the flame-retardant fire-insulating layer (2), each row of nozzles (411) is 0.3-0.5m away from the edge of the flame-retardant fire-insulating layer (2), the distance between every two adjacent nozzles (411) in each row of nozzles (411) is 0.6-1.5m, and the distance between the nozzles (411) and the ground is 0.5-1.0 m;

the distance between the movable water fire truck (42) and the flame-retardant fire-insulating layer (2) is 5-10m, and the water carrying capacity is 6-10 t.

8. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the temperature acquisition system (52) comprises an infrared camera (521) which is arranged 4-8m away from the edge of the flame-retardant fire-insulating layer (2), and the distance between the infrared camera (521) and the ground is 2.5-3.5 m;

the device also comprises a thermocouple (522) arranged in the opening oil pool (12) and the simulation conservator (3);

the temperature data acquisition system is connected with the infrared camera (521) and the thermocouple (522).

9. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the image acquisition system (53) comprises two ground cameras (531) arranged at two sides of the flame-retardant fire-proof layer (2);

the device also comprises a high-definition video camera (532) arranged in the simulated oil sump (11), and a micro camera (533) arranged in a passage of the simulated oil sump (11) leading to an external accident oil collecting pool;

the system also comprises a multi-channel video data acquisition system connected with the ground camera (531), the high-definition video camera (532) and the micro camera (533).

10. The converter transformer oil pit fire insulation test platform according to claim 1, characterized in that: the flow acquisition system (54) comprises a flow indicator probe (541) which is arranged in a channel of the simulation conservator cavity (31) leading to the open oil pool (12) and a channel of the simulation oil pit (11) leading to an accident oil pool arranged outside;

also included is a flow data acquisition system connected to the flow indicator probe (541).

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