Water spray fire extinguishing system based on extra-high voltage converter station

Abstract

The invention relates to the technical field of extra-high voltage converter station fire extinguishing systems, and provides a water spray fire extinguishing system based on an extra-high voltage converter station, the water spray fire extinguishing system comprises a fire pool, a fire pump, a water supply network, a deluge valve group, a filter, a water spray nozzle, a water spray controller and a detection alarm device, the water spray nozzle is arranged in the extra-high voltage converter station; the water supply network is connected with the fire pool and the water mist nozzles, and water is conveyed from the fire pool to the water mist nozzles through the fire pump; the filter is mounted at a water inlet of the water supply network; the detection alarm device is arranged in the extra-high voltage converter station and is used for detecting a fire disaster and sending out an alarm signal; the system is simple in structure, convenient to install, easy to operate, high in fire extinguishing efficiency and capable of ensuring that the side switch and the middle switch of the string where the converter transformer is located are both in the open position, that is, when the converter transformer is not electrified, the deluge valve has the starting condition, misoperation of the deluge valve system when the converter transformer operates in an electrified mode is prevented, and comprehensive fire protection is provided for the extra-high voltage converter station.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing systems for ultra-high voltage converter stations, and in particular to a water spray fire extinguishing system based on ultra-high voltage converter stations. Background Art

[0002] UHV converter station refers to a converter station used for high-voltage direct current transmission, which can convert alternating current into high-voltage direct current, or vice versa. UHV converter stations are usually used for long-distance power transmission and power exchange between two AC power grids. In UHV converter stations, the converter transformer is the most important and core equipment. The converter transformer is an oil-filled equipment. Once an internal failure causes a fire, the consequences are very serious. In order to enhance the fire-fighting ability of the converter transformer, a water spray fire-fighting system is usually installed in the converter transformer area of ​​the UHV converter station. In the extreme case of a fire in the converter transformer, it can effectively improve the fire-fighting, cooling, and fire-prevention capabilities of the converter area.

[0003] The water spray fire extinguishing system of the UHV converter station is a special fire fighting system used to timely and effectively extinguish fires when a fire occurs. The system is usually composed of water spray fire extinguishers, deluge valve systems, fire alarm systems, etc., to ensure reliable and effective fire fighting operations under special environments such as high voltage and high current. In general, the water spray fire extinguishing system of the UHV converter station is an advanced fire fighting system that integrates multiple technologies such as automation, remote control and emergency mechanical start-up, providing comprehensive fire protection for the UHV converter station.

[0004] After searching, the existing patent (Announcement No.: CN 217745447 U) discloses a fire extinguishing system for a UHV converter station, which relates to the technical field related to fire fighting in UHV converter stations, specifically including a compressed air foam generating component and a high-lift fire-fighting robot. Among them, the compressed air foam generating component includes a compressed air foam generating device, an air compressor connected to the compressed air foam generating device, a water tank connected to the compressed air foam generating device through a fire main, multiple groups of fire pumps connected in parallel to the fire main, and a foam tank connected to the other end of the compressed air foam generating device. The high-lift fire-fighting robot is connected to the compressed air foam generating device through a fire hose. The utility model connects the high-lift fire-fighting robot to the compressed air foam generating device to quickly extinguish the fire of any converter transformer, thereby improving the overall fire-fighting capability of the converter station and reducing personal injury.

[0005] However, in the implementation of relevant technologies, the following problems were found: the above-mentioned fire extinguishing system has no interlocking conditions in manual start-up or mechanical emergency start-up mode, and the water spray fire extinguishing system is prone to malfunction, which will cause insulation flashover failure of the converter transformer. When the water spray system malfunctions, a large amount of water mist is sprayed onto the converter transformer body. Once the water vapor enters the junction box of the non-electrical protection tripping of the gas relay, pressure release, oil flow relay, etc., the secondary insulation of the cable is reduced and the non-electrical protection of the converter transformer is malfunctioning and tripping. Once the converter transformer fails and trips, when the UHV converter station is transmitting power at full load, a huge load will be lost instantly, causing immeasurable losses to the power grid and not conducive to the safe and reliable operation of the power grid. Summary of the invention

[0006] The present invention proposes a water spray fire extinguishing system based on an ultra-high voltage converter station, aiming to solve the problem that the fire extinguishing system of the existing ultra-high voltage converter station is prone to malfunction of the water spray fire extinguishing system, thereby causing insulation flashover failure of the converter transformer, which is not conducive to the safe and reliable operation of the power grid.

[0007] The technical solution of the present invention is as follows: A water spray fire extinguishing system based on a UHV converter station includes a fire water pool, a fire water pump, a water supply network, a deluge valve group, a filter, a water mist nozzle, a water spray controller and a detection alarm device.

[0008] The deluge valve assembly is composed of a deluge valve, a solenoid valve, a pressure switch, a hydraulic alarm, a pressure gauge and matching valve components;

[0009] The water spray nozzle is arranged inside the UHV converter station and is used to spray water mist in case of fire;

[0010] The water supply network connects the fire water pool and the water mist nozzle, and transports water from the fire water pool to the water mist nozzle through the fire water pump;

[0011] The filter is installed at the water inlet of the water supply network;

[0012] The water spray controller is used to control the opening and closing of the water mist nozzle and adjust the density of the water mist sprayed by the water mist nozzle;

[0013] The detection and alarm device is arranged inside the UHV converter station and is used for detecting fire and sending out an alarm signal.

[0014] Furthermore, the fire pump outlet is provided with a bypass pipe and an electric drain valve, and is connected to a fire water tank, which can meet the needs of regular automatic inspection of the fire protection system.

[0015] Furthermore, the detection alarm device includes a smoke detector, a temperature detector and two temperature sensing cables, one of which is a switch-type temperature sensing cable, 5 to 10 mm away from the transformer surface, and the other is an analog temperature sensing cable, arranged close to the transformer surface.

[0016] Furthermore, the temperature sensing cable also includes:

[0017] Temperature measurement module: used to measure the temperature of the object being measured;

[0018] Signal processing module: used to receive and process the signal sent by the temperature measurement module, and amplify, filter and digitize the signal to ensure the accuracy of the final temperature data;

[0019] Communication module: The temperature sensing cable exchanges data with the host computer through the communication module to transmit temperature data and control signals;

[0020] Power module: provides power for the entire temperature sensing cable.

[0021] Furthermore, the hydraulic alarm is installed on the outer wall of the deluge valve chamber, and the connecting pipe between the hydraulic alarm and the alarm valve is made of galvanized steel pipe.

[0022] Furthermore, the water mist nozzle adopts a centrifugal atomization type water mist nozzle.

[0023] Furthermore, the pipes of the water supply network are connected by clamp grooves and are made of galvanized steel pipes.

[0024] Furthermore, the water spray controller is provided with three control modes: automatic control, manual control and emergency operation. A fire pump room is also provided inside the UHV converter station. The fire pump room is provided with an on-site control device for a fire water pump and a fire control cabinet.

[0025] Furthermore, the water inlet pipe of the fire water tank has a diameter of DN50 and a flow rate of 10m3 / h. The water inlet of the fire water tank is controlled by a liquid level meter and an electric butterfly valve, and is provided with a manhole. The fire water tank is also provided with a ventilation pipe, an overflow drain pipe and a high and low liquid level alarm display device.

[0026] Furthermore, a normally closed contact of a switch of the 500kV GIS AC field string where the converter transformer is located is connected in series in the start-up circuit of the deluge valve.

[0027] The working principle and beneficial effects of the present invention are:

[0028] 1. In the present invention: when a fire occurs, the system can detect a temperature rise through a temperature sensing cable, and the temperature sensing cable detection module will send a signal to the fire protection system host. According to the setting of the host screen, the system will remind the operating staff on duty to manually start the deluge valve to spray water to extinguish the fire, or automatically send a control command to the local control box of the deluge valve to automatically open the deluge valve to spray water to extinguish the fire; in addition, the start-up circuit of the deluge valve is also connected in series with the normally closed contacts of the switch of the 500kV GIS AC field string where the converter transformer is located, ensuring that the side switches and the middle switches of the string where the converter transformer is located are in the open position, that is, the deluge valve has the start-up conditions only when the converter transformer is not energized, to prevent the deluge valve system from malfunctioning when the converter transformer is energized, thereby effectively avoiding the converter transformer insulation flashover failure and improving the safe and reliable operation of the power grid.

[0029] 2. In the present invention: when a fire occurs, the fire alarm signal is transmitted to the fire control room, and the deluge valve and the fire pump are automatically opened to realize automatic water spraying fire extinguishing. When the manual control mode is adopted, after the fire alarm signal is manually confirmed, the deluge valve and the fire pump are manually started remotely in the control room to realize water spraying fire extinguishing by the water spray system. The fire pump room is provided with an on-site control device of the fire pump and a fire control cabinet, which can manually operate the fire pump and the deluge valve on-site to realize the emergency operation of the water spray fire extinguishing system, and has higher safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a fire extinguishing start-up control flow chart of a water spray fire extinguishing system based on an ultra-high voltage converter station proposed by the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 , the present invention provides a technical solution:

[0034] A water spray fire extinguishing system based on an ultra-high voltage converter station comprises a fire water pool, a fire water pump, a water supply network, a deluge valve group, a filter, a water mist nozzle, a water spray controller and a detection alarm device, wherein the deluge valve group consists of a deluge valve, a solenoid valve, a pressure switch, a hydraulic alarm, a pressure gauge and matching valve components; the water spray nozzle is arranged inside the ultra-high voltage converter station and is used to spray water mist in case of fire; the water supply network connects the fire water pool and the water mist nozzle, and transports water from the fire water pool to the water mist nozzle through the fire water pump; the filter is installed at the water inlet of the water supply network; the water spray controller is used to control the opening and closing of the water mist nozzle and adjust the density of the water mist sprayed by the water mist nozzle; the detection alarm device is arranged inside the ultra-high voltage converter station and is used to detect fire and send out an alarm signal.

[0035] In this embodiment, a bypass pipe and an electric drain valve are provided at the outlet of the fire pump and are connected to the fire water tank, which can meet the needs of regular automatic inspection of the fire protection system.

[0036] In this embodiment, the detection alarm device includes a smoke detector, a temperature detector and two temperature sensing cables, one of which is a switch-type temperature sensing cable, which is 5 to 10 mm away from the surface of the transformer, and the other is an analog temperature sensing cable, which is arranged close to the surface of the transformer; wherein the temperature sensing cable also includes: a temperature measuring module: used to measure the temperature of the object being measured; a signal processing module: used to receive and process the signal sent by the temperature measuring module, and amplify, filter and digitize the signal to ensure the accuracy of the temperature data finally obtained; a communication module: the temperature sensing cable exchanges data with the host computer through the communication module, which is used to transmit temperature data and control signals; a power supply module: provides power for the entire temperature sensing cable.

[0037] By adopting the above technical solution, all-round protection of the transformer is achieved, and the surface temperature rise of the transformer and external fire can be sensed in time, so that fire hazards can be discovered at the first time and the fire extinguishing system can be activated in time to reduce disasters.

[0038] In this embodiment, the hydraulic alarm is installed on the outer wall of the deluge valve room, and the connecting pipe between the hydraulic alarm and the alarm valve is made of galvanized steel pipe; the main function of the deluge valve group is to connect or shut off the water supply of the water spray fire extinguishing system. It can be opened by a remote electric control signal, or it can be opened by receiving a transmission pipe signal or directly opened by a manual emergency operation valve.

[0039] In this embodiment, the water mist nozzle adopts a centrifugal atomization type water mist nozzle; the water mist nozzle has the characteristics of uniform distribution, high coverage, high spray volume, etc., and has a large effective range and good fire extinguishing effect.

[0040] In this embodiment, the pipes of the water supply network are connected by clamp groove type, and the material is galvanized steel pipe; this connection method is not only convenient for the installation of the pipes, but also firmly installed, because the ring pipe around the transformer in the ultra-high voltage converter station must maintain a certain safety distance from the transformer casing, and shaking or falling is never allowed. The transformer is far away from the surrounding walls, and the pipe bracket cannot be fixed on the wall and extended too far. In order to avoid large shaking of the pipe during the spraying process, channel steel or angle steel is erected around the transformer and welded, and then horizontal channel steel is welded on the channel steel or angle steel to form a fence-type bracket, and then the ring pipe and the riser are arranged on the side thereof, holes are opened on the bracket at the specified distance, and fixed with U-shaped clips. After fixing in this way, the pipe is fixed very firmly, which can effectively avoid shaking and loosening, thereby improving the operation stability and reliability of the water spray fire extinguishing system.

[0041] In this embodiment, the water spray controller has three control modes: automatic control, manual control and emergency operation. A fire pump room is also provided inside the UHV converter station. The fire pump room is provided with a local control device for a fire water pump and a fire control cabinet. When a fire occurs, a fire alarm signal is transmitted to the fire control room, and the deluge valve and the fire water pump are automatically opened to realize automatic water spraying and fire extinguishing. When the manual control mode is adopted, after the fire alarm signal is manually confirmed, the deluge valve and the fire water pump are manually started remotely in the control room to realize water spraying and fire extinguishing by the water spray system. The fire pump room is provided with a local control device for a fire water pump and a fire control cabinet, and the fire water pump and the deluge valve can be manually operated on site to realize the emergency operation of the water spray fire extinguishing system.

[0042] In this embodiment, the water inlet pipe of the fire water pool has a diameter of DN50 and a flow rate of 10m3 / h. The water inlet of the fire water pool is controlled by a liquid level meter and an electric butterfly valve, and a manhole is provided to facilitate daily cleaning and maintenance of the fire water pool. The fire water pool is also provided with a ventilation pipe, an overflow drain pipe and a high and low liquid level alarm display device; the response time of the water spray fire extinguishing system can be shortened and the fire extinguishing efficiency can be improved.

[0043] Among them, the normally closed contacts of the switches in the 500kV GIS AC field string where the converter transformer is located are connected in series in the starting circuit of the deluge valve; it can ensure that the side switches and the middle switches in the string where the converter transformer is located are in the open position, that is, the deluge valve is able to start only when the converter transformer is not energized, preventing the deluge valve system from malfunctioning when the converter transformer is energized, thereby improving the safety of the fire extinguishing system.

[0044] It should be noted that the water spray fire extinguishing system based on the UHV converter station has a simple structure, is easy to install, easy to operate, and has high fire extinguishing efficiency. Its fire extinguishing medium is water, which is easy to use and relatively cheap. It can also be used for fire control and protective cooling, providing comprehensive fire protection for the UHV converter station.

[0045] The process of fire extinguishing implemented by the system is as follows: when a fire occurs, the temperature sensing cable on the converter transformer body detects a temperature rise, and the temperature sensing cable detection module will send a signal to the fire protection system host. According to the settings of the host screen, the system will remind the operating staff on duty to manually start the deluge valve to spray water to extinguish the fire, or automatically send a control command to the local control box of the deluge valve to automatically open the deluge valve to spray water to extinguish the fire; in addition, the starting circuit of the deluge valve is also connected in series with the 500kV DC power supply of the converter transformer. The normally closed contacts of the switches in the GIS AC field string ensure that the side switches and the middle switches in the string where the converter transformer is located are in the open position, that is, the deluge valve is capable of starting only when the converter transformer is not energized, to prevent the deluge valve system from malfunctioning when the converter transformer is energized. In addition, when a fire occurs, the fire alarm signal is transmitted to the fire control room, automatically opening the deluge valve and the fire pump to achieve automatic water spraying and extinguishing. When manual control is used, after the fire alarm signal is manually confirmed, the deluge valve and the fire pump are manually started remotely in the control room to achieve water spraying and extinguishing by the water spray system. The fire pump room is equipped with an on-site control device for the fire pump and a fire control cabinet, which can manually operate the fire pump and the deluge valve on-site to achieve emergency operation of the water spray fire extinguishing system.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water spray fire extinguishing system based on a UHV converter station, comprising a fire water pool, a fire water pump, a water supply network, a deluge valve group, a filter, a water mist nozzle, a water spray controller and a detection alarm device, characterized in that: The deluge valve assembly is composed of a deluge valve, a solenoid valve, a pressure switch, a hydraulic alarm, a pressure gauge and matching valve components; The water spray nozzle is arranged inside the UHV converter station and is used to spray water mist in case of fire; The water supply network connects the fire water pool and the water mist nozzle, and transports water from the fire water pool to the water mist nozzle through the fire water pump; The filter is installed at the water inlet of the water supply network; The water spray controller is used to control the opening and closing of the water mist nozzle and adjust the density of the water mist sprayed by the water mist nozzle; The detection and alarm device is arranged inside the UHV converter station and is used for detecting fire and sending out an alarm signal.

2. A water spray fire extinguishing system based on a UHV converter station according to claim 1, characterized in that: The fire water pump outlet is provided with a bypass pipe and an electric drain valve, and is connected to a fire water tank.

3. The water spray fire extinguishing system based on the UHV converter station according to claim 1 is characterized in that: The detection alarm device includes a smoke detector, a temperature detector and two temperature sensing cables, one of which is a switch-type temperature sensing cable, which is 5 to 10 mm away from the transformer surface, and the other is an analog temperature sensing cable, which is arranged close to the transformer surface.

4. A water spray fire extinguishing system based on a UHV converter station according to claim 3, characterized in that: The temperature sensing cable also includes: Temperature measurement module: used to measure the temperature of the object being measured; Signal processing module: used to receive and process the signal sent by the temperature measurement module, and amplify, filter and digitize the signal to ensure the accuracy of the final temperature data; Communication module: The temperature sensing cable exchanges data with the host computer through the communication module to transmit temperature data and control signals; Power module: provides power for the entire temperature sensing cable.

5. The water spray fire extinguishing system based on the UHV converter station according to claim 1 is characterized in that: The hydraulic alarm is installed on the outer wall of the deluge valve room, and the connecting pipe between the hydraulic alarm and the alarm valve is a galvanized steel pipe.

6. The water spray fire extinguishing system based on the UHV converter station according to claim 1 is characterized in that: The water mist nozzle adopts a centrifugal atomization type water mist nozzle.

7. The water spray fire extinguishing system based on the UHV converter station according to claim 1 is characterized in that: The pipes of the water supply network are connected by clamp grooves and are made of galvanized steel pipes.

8. The water spray fire extinguishing system based on the UHV converter station according to claim 1 is characterized in that: The water spray controller is provided with three control modes: automatic control, manual control and emergency operation. A fire pump room is also provided inside the UHV converter station. The fire pump room is provided with an on-site control device for a fire water pump and a fire control cabinet.

9. The water spray fire extinguishing system based on the UHV converter station according to claim 1 is characterized in that: The water inlet pipe diameter of the fire water tank is DN50, and the flow rate is 10m3 / h. The water inlet of the fire water tank is controlled by a liquid level meter and an electric butterfly valve, and is provided with a manhole. The fire water tank is also provided with a ventilation pipe, an overflow drain pipe, and a high and low liquid level alarm display device.

10. The water spray fire extinguishing system based on the UHV converter station according to claim 1, characterized in that: The start-up circuit of the deluge valve is connected in series with the normally closed contact of the switch of the 500kV GIS AC field string where the converter transformer is located.

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