Prefabricated transformer substation

Abstract

The utility model relates to the field of fire prevention, suppression or extinguishing of electrical equipment, in particular to a prefabricated substation. The prefabricated substation comprises a box body, a transformer is arranged in the box body, the prefabricated substation further comprises a fire extinguishing system, and the fire extinguishing system comprises a fire-fighting bottle, a fire extinguishing pipeline communicated with the fire-fighting bottle, a fire detector and a controller. A plurality of branch pipelines of the fire extinguishing pipeline are connected to the bottom of the transformer oil tank so that the fire extinguishing medium in the fire fighting bottle can be injected into the bottom of the transformer oil tank, and the controller is connected with an electric control valve on the fire extinguishing pipeline; the pressure relief device is used for relieving pressure of the transformer oil tank when fire extinguishing media are injected into the transformer oil tank. The fire-fighting bottle is connected with the fire extinguishing pipeline, and the fire extinguishing pipeline is connected to the bottom of the transformer oil tank through the branch pipelines, so that when a fire behavior is monitored, a fire extinguishing medium in the fire-fighting bottle can be injected into the bottom of the transformer oil tank, the oil temperature is reduced, oxygen is isolated, and the purpose of efficient fire extinguishing is achieved.

Description

Technical Field

[0001] The utility model relates to the field of fire prevention, suppression or extinguishing of electrical equipment, in particular to a prefabricated transformer substation. Background Art

[0002] Substation refers to the place in the power system where voltage and current are transformed, electric energy is received and distributed. Transformer is an important equipment in power plants and substations, and has a great impact on the quality of power supply and the stability of power system operation. Once a transformer catches fire for some reason, the power system will lose power and be paralyzed, which will not only affect the stability of power supply, but also cause huge property losses and even endanger life safety. Therefore, it is particularly important to install a fire extinguishing system in the substation.

[0003] The Chinese utility model patent with the authorization announcement number CN212571886U discloses an intelligent fire-fighting prefabricated substation, which has three compartments: a high-voltage room, a transformer room, and a low-voltage room. Temperature-sensing and smoke-sensing components are installed in the three compartments, and a perfluorohexanone fire extinguishing agent solvent bottle, i.e., a fire bottle, is installed on the outside of the substation. The outlet end of the fire bottle is connected to the gas jet assembly of the three compartments through a pipeline. The gas jet assembly includes a gas nozzle and an electromagnetic selector valve that controls the on-off of the gas nozzle side pipeline. When a fire occurs in a compartment, the temperature-sensing and smoke-sensing components transmit the fire signal to the control system, and then the control system opens the electromagnetic selector valve of the corresponding compartment, so that the fire-extinguishing gas in the fire bottle is ejected from the nozzle to extinguish the fire. Among them, the transformer, which is the core primary equipment of the substation, is mostly an oil-immersed natural cooling transformer, which consumes a huge amount of oil. Once a fire occurs in the transformer room, the pressure in the transformer oil tank increases and the temperature rises sharply, which may cause an explosion in severe cases. However, the gas jet assembly in the compartment can only extinguish the fire on the outside of the transformer, and it is difficult to effectively extinguish the fire inside the transformer tank, causing the fire to spread. Utility Model Content

[0004] The utility model aims to provide a prefabricated substation to solve the problem that the substation fire extinguishing system in the prior art can only extinguish the fire outside the transformer when a fire occurs, but is difficult to efficiently extinguish the fire inside the transformer oil tank, resulting in the expansion of the fire.

[0005] Based on the above technical problems, a prefabricated substation of the present utility model includes a box body, a transformer is arranged inside the box body, and further includes a fire extinguishing system. The fire extinguishing system includes a fire extinguisher bottle, a fire extinguishing pipeline communicated with the fire extinguisher bottle, a fire detector and a controller. The fire extinguishing pipeline includes a transformer fire extinguishing pipeline, and the transformer fire extinguishing pipeline includes a plurality of branch pipelines. The plurality of branch pipelines are connected to the bottom of the transformer oil tank so that the fire extinguishing medium in the fire extinguisher bottle can be injected into the bottom of the transformer oil tank. The controller is controllably connected to an electric control valve on the fire extinguishing pipeline. The prefabricated substation further includes a pressure relief mechanism for relieving the pressure of the transformer oil tank when injecting the fire extinguishing medium into the transformer oil tank.

[0006] The present utility model aims at improving the problem that in the existing substation fire extinguishing system, when a fire occurs, it can only extinguish the fire outside the transformer, and it is difficult to efficiently extinguish the fire inside the transformer oil tank, resulting in the spread of the fire. The fire extinguisher bottle is connected to the fire extinguishing pipeline, and the fire extinguishing pipeline is connected to the bottom of the transformer oil tank through a plurality of branch pipelines, so that when a fire is detected, the fire extinguishing medium in the fire extinguisher bottle can be injected into the bottom of the transformer oil tank. At the same time, the pressure relief mechanism relieves the pressure of the transformer oil tank to prevent the excessive pressure in the transformer oil tank from affecting the safety of the fire extinguishing process and the injection efficiency of the fire extinguishing gas. The fire extinguishing medium entering the transformer oil tank through the plurality of branch pipelines can form a large number of bubbles and rise in the transformer oil tank to quickly exchange heat with the high-temperature oil in the transformer oil tank, thereby reducing the oil temperature and also isolating oxygen, so as to achieve the purpose of efficient fire extinguishing.

[0007] Further, the plurality of branch pipelines are horizontally and evenly arranged on the side surface of the transformer oil tank.

[0008] Further, the plurality of branch pipelines are all arranged on the side surface of the transformer oil tank adjacent to the side wall where the radiator is located.

[0009] Further, the pressure relief mechanism includes a pressure relief oil pool and a pressure relief pipeline connecting the pressure relief oil pool and the transformer oil tank. A control valve controllably connected to the controller is arranged on the pressure relief pipeline.

[0010] Further, an oil pump is connected in series on the pressure relief pipeline, and the oil pump is controllably connected to the controller.

[0011] Further, the pressure relief pipeline is connected to the side wall of the transformer oil tank where the radiator is located. The connection position of the pressure relief pipeline and the transformer oil tank is close to the upper oil inlet pipe section where the radiator is connected to the transformer oil tank and is arranged on the lower side of the upper oil inlet pipe section.

[0012] Further, the pressure relief oil pool is arranged at the bottom of the box body corresponding to the transformer room.

[0013] Further, the fire detector includes an oil temperature detector and a gas detector.

[0014] Further, the fire extinguisher bottle and the controller are arranged in the low-pressure chamber of the box body.

[0015] Further, the fire extinguishing system further includes fire detectors installed in the low-pressure chamber, high-pressure chamber, and transformer chamber. The fire extinguishing pipeline further includes compartment fire extinguishing pipelines. The compartment fire extinguishing pipelines include three compartment branch pipelines, and the three compartment branch pipelines are connected to the top nozzles of the low-pressure chamber, high-pressure chamber, and transformer chamber so that the fire extinguishing medium in the fire extinguisher bottle can extinguish the fire in the compartment through the nozzles. The controller is connected to the shut-off valve on the compartment branch pipeline for control. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a prefabricated substation of the present utility model;

[0017] Figure 2 is Figure 1 Top view;

[0018] Figure 3 It is a control block diagram of the controller.

[0019] In the figure: 1, cabinet body; 2, fire extinguisher bottle; 3, controller; 4, fire detector; 5, fire extinguishing pipeline; 6, electric control valve; 7, oil pump; 8, fire situation detector; 9, high-pressure chamber; 10, transformer chamber; 11, low-pressure chamber; 12, transformer oil tank; 13, high-voltage switch; 14, pressure relief oil pool; 15, low-voltage switch; 16, control valve; 17, shut-off valve; 18, nozzle; 19, transformer fire extinguishing pipeline, 20, branch pipeline. Detailed Embodiment

[0020] In the prior art, in a prefabricated substation, a controller, a temperature and smoke sensing component, and a fire extinguisher bottle are often installed in a box body. The outlet end of the fire extinguisher bottle is connected to a gas jetting component in the compartment through a pipeline, and an electromagnetic selection valve is installed on the pipeline. When the temperature and smoke sensing component monitors a fire in the compartment, it transmits a signal to the controller, and the controller opens the electromagnetic selection valve, so that the fire extinguishing gas in the fire extinguisher bottle can be ejected from the gas jetting component to extinguish the fire in the compartment. Since most substations use oil-immersed natural cooling transformers and the oil consumption is huge, once a fire breaks out in the transformer chamber, the pressure in the transformer oil tank increases and the temperature rises sharply, which may cause an explosion in severe cases. However, the gas jetting component in the compartment can only extinguish the fire outside the transformer and it is difficult to efficiently extinguish the fire inside the transformer oil tank.

[0021] The present utility model proposes an improved technical solution for the problems existing in the above technical solutions. The core concept of the present utility model is: connecting a fire extinguishing bottle to a fire extinguishing pipeline, and the fire extinguishing pipeline is connected to the bottom of a transformer oil tank through a plurality of branch pipelines, so that when a fire is detected, the fire extinguishing medium in the fire extinguishing bottle can be injected into the bottom of the transformer oil tank. At the same time, a pressure relief mechanism relieves the pressure of the transformer oil tank to prevent excessive pressure in the transformer oil tank from affecting the injection efficiency of the fire extinguishing gas. The fire extinguishing medium enters the transformer oil tank to form bubbles and rises in the transformer oil tank to quickly exchange heat with the high-temperature oil in the transformer oil tank, thereby reducing the oil temperature and also isolating oxygen, so as to achieve the purpose of efficient fire extinguishing.

[0022] Based on the above inventive concept, a prefabricated substation of the present utility model includes a box body. A high-voltage switch 13, a transformer, and a low-voltage switch 15 are arranged in the box body, and the prefabricated substation is divided into a high-voltage chamber 9, a transformer chamber 10, and a low-voltage chamber 11 as shown by a partition board. It also includes a fire extinguishing system. The fire extinguishing system includes a fire extinguishing bottle 2. In this embodiment, the fire extinguishing bottle contains liquid carbon dioxide. In other embodiments, liquid nitrogen or perfluoromethylcyclohexane fire extinguishing agent can also be used. The fire extinguishing system further includes a fire extinguishing pipeline 5 communicated with the fire extinguishing bottle 2, a fire detector 8, and a controller 3. The fire extinguishing pipeline 5 includes a transformer fire extinguishing pipeline 19. The transformer fire extinguishing pipeline includes a plurality of branch pipelines 20. The plurality of branch pipelines 20 are connected to the bottom of the transformer oil tank 12 so that the fire extinguishing medium in the fire extinguishing bottle 2 can be injected into the bottom of the transformer oil tank 12. Arranging a plurality of branch pipelines can enable the fire extinguishing medium of the fire extinguishing bottle 2 to enter the transformer oil tank 12 from a plurality of inlets to improve the fire extinguishing efficiency of the fire extinguishing medium. The controller 3 is controllably connected to an electric control valve 6 on the fire extinguishing pipeline 5. The prefabricated substation further includes a pressure relief mechanism. The transformer oil tank 12 is hermetically arranged. Injecting the fire extinguishing medium into the transformer oil tank 12 will cause the pressure in the transformer oil tank 12 to increase. At this time, a pressure relief mechanism needs to be provided to relieve the pressure of the transformer oil tank 12 to ensure the safety of the fire extinguishing process and also ensure the injection efficiency of the fire extinguishing medium. Figure 1 When the fire detector 8 detects a fire, it transmits a signal to the controller 3, as

[0023] shown. Figure 3As shown, the controller controls the electric control valve of the transformer oil circuit, and also controls the tripping of the high-voltage switch and the low-voltage switch. At this time, the three compartments are tripped and de-energized. At the same time, the controller 3 controls the electric control valve 6 on the fire extinguishing pipeline 5 to conduct the fire extinguishing pipeline 5, so that the fire extinguishing medium in the fire extinguisher bottle 2 can be injected into the bottom of the transformer oil tank 12 through multiple branch pipelines. At the same time, the pressure relief mechanism also relieves the pressure of the transformer oil tank 12 to ensure the safety of the fire extinguishing process and the injection efficiency of the fire extinguishing medium. The fire extinguishing medium enters the transformer oil tank 12 to form bubbles and rises in the transformer oil tank 12 to quickly exchange heat with the high-temperature oil in the transformer oil tank 12, thereby reducing the oil temperature and also isolating oxygen, so as to achieve the purpose of efficient fire extinguishing.

[0024] In this embodiment, the multiple branch pipelines are horizontally and evenly arranged on the side surface of the transformer oil tank 12. It can make the fire extinguishing medium in the fire extinguisher bottle 2 enter the transformer oil tank 12 evenly, so as to evenly exchange heat and extinguish the fire with the high-temperature oil in the transformer oil tank 12, avoiding inconsistent oil temperatures in different areas of the transformer when using the fire extinguishing medium. In addition, in other embodiments, the branch pipelines can also be evenly arranged on the bottom plane of the transformer oil tank, as long as it meets the requirement that the fire extinguishing medium can cool the high-temperature oil in the transformer oil tank.

[0025] In this embodiment, the multiple branch pipelines are all arranged on the side surface of the transformer oil tank 12 adjacent to the side wall where the radiator is located. In this embodiment, radiators are arranged on both sides of the transformer oil tank 12 to facilitate the heat dissipation of the transformer oil tank 12. Arranging the branch pipelines on the side surface of the transformer oil tank 12 adjacent to the side wall where the radiator is located can avoid interference between the branch pipelines and the radiator and is convenient for installation.

[0026] In this embodiment, the pressure relief mechanism includes a pressure relief oil pool 14 and a pressure relief pipeline connecting the pressure relief oil pool 14 and the transformer oil tank 12. A control valve 16 controlled by the controller 3 is arranged on the pressure relief pipeline. When the fire detector 8 detects a fire, the fire extinguishing medium in the fire extinguisher bottle 2 is injected into the bottom of the transformer oil tank 12. At the same time, the controller 3 transmits the fire signal to the control valve 16 to conduct the pressure relief pipeline to relieve the pressure of the transformer oil tank 12. The high-temperature oil in the transformer oil tank 12 can flow to the pressure relief oil pool 14 along the pressure relief pipeline. The fire extinguishing medium enters the transformer oil tank 12 to form bubbles and rises in the transformer oil tank 12, and finally can also be discharged along the pressure relief pipeline. In addition, in other embodiments, an exhaust pipeline can be opened at the upper part of the transformer oil tank to relieve the pressure of the transformer oil tank.

[0027] In this embodiment, an oil pump 7 is connected in series on the pressure relief pipeline, and the oil pump 7 is controlled and connected to the controller 3. When the oil temperature in the transformer oil tank 12 rises and when a fire extinguishing medium is injected into the transformer oil tank 12, the pressure in the transformer oil tank 12 will rise. If relying solely on the pressure in the transformer oil tank 12 to discharge the high-temperature oil and gas in the tank, it is difficult to ensure the pressure relief efficiency, and it is very difficult to quickly contain a fire in case of a fire. Therefore, this embodiment provides a preferred solution: an oil pump 7 is connected in series on the pressure relief pipeline. When a fire is detected, the controller 3 controls the oil pump 7 to work, and the high-temperature oil in the transformer oil tank 12 can be quickly pumped out. Thus, the fire can be quickly contained and the fire extinguishing efficiency is improved.

[0028] In this embodiment, the pressure relief pipeline is connected to the side wall where the radiator of the transformer oil tank 12 is located. The connection position of the pressure relief pipeline and the transformer oil tank 12 is close to the upper oil inlet pipe section where the radiator is connected to the transformer oil tank 12, and is arranged on the lower side of the upper oil inlet pipe section. The connection position of the pressure relief pipeline and the transformer oil tank 12 is set at the lower part of the oil inlet pipe, so that the high-temperature oil in the upper part of the transformer oil tank can be quickly discharged along the pressure relief pipeline, the oil level and oil temperature inside the transformer can be quickly reduced, and the working efficiency is improved.

[0029] In this embodiment, the pressure relief oil pool 14 is arranged at the bottom of the box body corresponding to the transformer chamber 10. The pressure relief oil pool 14 of this embodiment is arranged at the bottom of the transformer chamber 10 so that the high-temperature oil in the transformer oil tank 12 can also enter the pressure relief oil pool 14 along the pressure relief pipeline when there is no power device. Of course, it also facilitates the layout of the pipeline, saves the pipeline and enables the high-temperature oil to quickly flow into the pressure relief oil pool 14. In addition, in other embodiments, the pressure relief oil pool 14 can also be arranged at the bottom of the box body corresponding to the high-voltage chamber 9 or the low-voltage chamber 11. Of course, the pressure relief oil pool 14 can also be arranged outside the box body, as long as it is satisfied that when the pressure relief work is carried out, the high-temperature oil in the transformer oil tank can enter the pressure relief oil pool 14 through the pressure relief pipeline.

[0030] The fire detector 8 of this embodiment is arranged on the transformer oil tank 12 and includes an oil temperature detector and a gas detector. The oil temperature detector is used to monitor the oil temperature in the transformer oil tank 12, and the gas detector is used to monitor the gas concentration in the transformer chamber 10. When the oil temperature in the transformer oil tank 12 exceeds the standard or the gas concentration in the transformer chamber 10 exceeds the standard, the oil temperature detector and the gas detector transmit signals to the controller 3, and the controller 3 performs subsequent fire extinguishing procedures. Setting the oil temperature detector and the gas detector at the same time can monitor the fire situation within two standards, can more comprehensively reflect the operating state of the transformer oil tank 12, and can timely detect potential safety hazards. In other embodiments, the fire detector can also be a smoke detector and an infrared temperature sensor.

[0031] In this embodiment, the fire extinguisher bottle 2 and the controller 3 are arranged in the low-voltage chamber 11 of the box body. A cabinet 1 is arranged in the low-voltage chamber 11, and the fire extinguisher bottle 2 and the controller 3 are arranged in the cabinet 1 in the low-voltage chamber 11, which facilitates maintenance when problems occur with the fire extinguisher bottle 2 and the controller 3, makes the structure of the entire substation more compact, saves space, and at the same time, it is not easy to catch fire in the low-voltage chamber 11. Thus, it is ensured that the controller 3 and the fire extinguisher bottle 2 are not easily damaged, and the fire extinguishing system will not be paralyzed, ensuring the reliability and safety of the fire extinguishing system. In addition, in other embodiments, the fire extinguisher bottle 2 and the controller 3 can also be placed outside the box body, as long as it is ensured that the fire extinguishing system can operate stably.

[0032] In this embodiment, the fire extinguishing system further includes the fire detectors 4 as shown in Figure 2 installed in the low-voltage chamber 11, the high-voltage chamber 9, and the transformer chamber 10. The fire extinguishing pipeline 5 further includes a compartment fire extinguishing pipeline. The compartment fire extinguishing pipeline includes three compartment branch pipelines, and the three compartment branch pipelines are connected to the top nozzles 18 of the low-voltage chamber 11, the high-voltage chamber 9, and the transformer chamber 10 so that the fire extinguishing medium in the fire extinguisher bottle 2 can extinguish the fire in the compartment through the nozzles 18. The controller 3 is controllably connected to the cut-off valve 17 as shown in Figure 2 on the compartment branch pipeline. When the fire detector 4 detects a fire in the corresponding compartment, it transmits a fire signal to the controller 3, and the controller 3 controls the cut-off valve 17 of the corresponding compartment to open so that the fire extinguishing medium in the fire extinguisher bottle 2 can be ejected from the nozzles 18 of the corresponding compartment to extinguish the fire in the compartment where the fire occurs.

[0033] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should, by the same token, be included in the protection scope of the present invention.

Claims

1. A prefabricated substation, comprising a box body, a transformer is arranged in the box body, and further comprising a fire extinguishing system, the fire extinguishing system includes a fire extinguisher bottle, a fire extinguishing pipeline communicated with the fire extinguisher bottle, a fire detector and a controller, and is characterized in that: The fire extinguishing pipeline includes a transformer fire extinguishing pipeline. The transformer fire extinguishing pipeline includes a plurality of branch pipelines, and the plurality of branch pipelines are connected to the bottom of the transformer oil tank so that the fire extinguishing medium in the fire extinguishing bottle can be injected into the bottom of the transformer oil tank. The controller is controllably connected to the electric control valve on the fire extinguishing pipeline. The prefabricated substation further includes a pressure relief mechanism for relieving the pressure of the transformer oil tank when injecting the fire extinguishing medium into the transformer oil tank.

2. The prefabricated substation according to claim 1, characterized in that: The plurality of branch pipelines are horizontally and evenly arranged on the side surface of the transformer oil tank.

3. The prefabricated substation according to claim 2, wherein: The plurality of branch pipelines are all arranged on the side surface of the transformer oil tank adjacent to the side wall where the radiator is located.

4. The prefabricated substation according to any one of claims 1 to 3, characterized in that: The pressure relief mechanism includes a pressure relief oil pool and a pressure relief pipeline connecting the pressure relief oil pool and the transformer oil tank. A control valve controllably connected to the controller is arranged on the pressure relief pipeline.

5. The prefabricated substation according to claim 4, characterized in that: An oil pump is connected in series on the pressure relief pipeline, and the oil pump is controllably connected to the controller.

6. The prefabricated substation according to claim 4, characterized in that: The pressure relief pipeline is connected to the side wall of the transformer oil tank where the radiator is located. The connection position of the pressure relief pipeline and the transformer oil tank is close to the upper oil inlet pipe section where the radiator is connected to the transformer oil tank, and is arranged on the lower side of the upper oil inlet pipe section.

7. The prefabricated substation according to claim 4, characterized in that: The pressure relief oil pool is arranged at the bottom of the box body corresponding to the transformer room.

8. The prefabricated substation according to any one of claims 1 to 3, characterized in that: The fire detector includes an oil temperature detector and a gas detector.

9. The prefabricated substation according to any one of claims 1-3, characterized in that: The fire extinguishing bottle and the controller are arranged in the low-voltage chamber of the box body.

10. The prefabricated substation according to any one of claims 1-3, characterized in that: The fire extinguishing system further includes fire detectors installed in the low-voltage chamber, high-voltage chamber, and transformer room. The fire extinguishing pipeline further includes an inter-compartment fire extinguishing pipeline. The inter-compartment fire extinguishing pipeline includes three inter-compartment branch pipelines, and the three inter-compartment branch pipelines communicate with the top nozzles of the low-voltage chamber, high-voltage chamber, and transformer room so that the fire extinguishing medium in the fire extinguishing bottle can extinguish the fire in the inter-compartment through the nozzles. The controller is controllably connected to the shut-off valve on the inter-compartment branch pipeline.

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