CN213100536U - Oil-immersed transformer gas control oil discharge nitrogen injection fire extinguishing device - Google Patents
Oil-immersed transformer gas control oil discharge nitrogen injection fire extinguishing device Download PDFInfo
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- CN213100536U CN213100536U CN202021347286.8U CN202021347286U CN213100536U CN 213100536 U CN213100536 U CN 213100536U CN 202021347286 U CN202021347286 U CN 202021347286U CN 213100536 U CN213100536 U CN 213100536U
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Abstract
The patent relates to a gas control oil discharge nitrogen injection fire extinguishing device for an oil immersed transformer, which consists of a pneumatic valve, a sealing diaphragm, a pneumatic control valve group and a nitrogen source. When the transformer has fire risk and needs oil drainage, the sealing diaphragm is firstly opened through the pneumatic control valve group, and then the pneumatic oil drainage valve and the pneumatic nitrogen injection valve are opened. The system is provided with the linkage valve which is mechanically linked with the pneumatic oil discharge valve on the nitrogen injection pipeline, so that the reliability of oil discharge and nitrogen injection is improved; the sealing membrane which is opened by air control is adopted, so that the leakage of the oil discharge pipeline can be completely avoided; meanwhile, necessary conditions for judging whether the transformer performs oil discharge and nitrogen injection light detection and pressure detection are added, and system misoperation is effectively prevented. The poor scheduling problem of current nitrogen fire extinguishing systems is annotated to oil extraction reliability is poor and leakproofness is not good has been solved to this scheme.
Description
Technical Field
The utility model relates to an oil-immersed transformer gas accuse oil extraction notes nitrogen extinguishing device belongs to power equipment safety field.
Background
According to the power system specification, when a medium-large transformer has a major fault and a combustion risk occurs, transformer insulating oil is quickly discharged to an accident oil storage pool, and nitrogen is injected into the transformer. However, the existing oil-discharging nitrogen-injecting fire extinguishing equipment operated on the net has a plurality of problems, wherein the main problems comprise: the oil discharge pipeline adopts a butterfly valve, and a reliable secondary sealing means is not provided, so that the sealing is not tight, and the risk of loss of insulating oil is high; a suspension type heavy hammer and electromagnetic pin opening mode is adopted, the risk of misoperation and refusal operation is high, and once oil is discharged, the oil can not be closed under remote control; after the transformer is in fire, once the automatic and remote control is not started, the transformer can only burn by fire due to the fact that a safe area is not provided with a manual control starting function; the automatic starting logic judgment condition of oil discharge and nitrogen injection is incomplete, and the detection of optical signals and pressure signals inside the transformer is lacked, so that the judgment cannot be accurately carried out; the nitrogen injection fire extinguishing system is inconvenient for effective simulation operation, and difficulty is brought to the test of the reliability of the nitrogen injection fire extinguishing system in a given period. Therefore, almost all oil-discharging nitrogen-injecting fire extinguishing systems cannot be completely and normally operated at present, and the operation safety of a transformer and a power grid is seriously influenced.
Disclosure of Invention
The invention provides a reliable oil-immersed transformer pneumatic control oil discharge and nitrogen injection fire extinguishing device, which can ensure reliable sealing of an oil discharge pipeline during normal operation of a transformer, effectively avoid misoperation and false triggering of oil discharge and nitrogen injection, realize remote manual and remote automatic quick opening of oil discharge and nitrogen injection valves of the transformer, turn off a connecting valve between an oil storage cabinet and the transformer and simultaneously inject flame retardant gas into the transformer to realize fire extinguishing and fire prevention when the transformer breaks down and has fire hazard.
The invention creates the following concrete technical scheme: an oil immersed transformer gas control oil discharge nitrogen injection fire extinguishing device comprises a transformer oil discharge pipeline and a valve, a transformer nitrogen injection pipeline and a valve; the transformer oil discharge pipeline is connected with a pneumatic oil discharge valve which is controlled to be opened and closed pneumatically; the transformer nitrogen injection pipeline is connected with a pneumatic nitrogen injection valve which is controlled to be opened and closed pneumatically, and is also connected with a linkage valve which is mechanically linked with a pneumatic oil discharge valve on the oil discharge pipeline in series; valve core rotating shafts of the pneumatic oil drain valve and the linkage valve are connected through a transmission connecting rod, and when the pneumatic oil drain valve is opened and closed on an oil drain pipeline, the linkage valve is driven to be opened and closed through the transmission connecting rod.
The transformer oil discharge pipeline and the transformer nitrogen injection pipeline both enter the fire-fighting cabinet, the oil discharge pipeline enters the fire-fighting cabinet and is sequentially connected with the overhaul valve, the pneumatic oil discharge valve and the oil leakage monitoring window, and then the oil discharge pipeline extends out of the fire-fighting cabinet and enters the oil storage pool; the nitrogen injection pipeline enters the fire-fighting cabinet and is sequentially connected with the linkage valve, the oil-gas isolation valve, the pneumatic nitrogen injection valve, the gas source main valve and the nitrogen source.
A pipeline is arranged between the outlet of the air source main valve and the pneumatic nitrogen injection valve and leads to an air inlet of the pneumatic control valve group; the pneumatic control valve group comprises an oil discharge control valve, a nitrogen injection control valve and an oil discharge nitrogen injection closing control valve; the outlet of the oil discharge control valve is connected with the opening driving port of the pneumatic actuator of the pneumatic oil discharge valve through a pipeline, the outlet of the nitrogen injection control valve is connected with the opening driving port of the pneumatic actuator of the pneumatic nitrogen injection valve through a pipeline, and the outlet of the oil discharge nitrogen injection closing control valve is simultaneously connected with the closing driving ports of the pneumatic oil discharge valve and the pneumatic nitrogen injection valve pneumatic actuator through pipelines.
The pneumatic oil drain valve outlet is provided with a sealing diaphragm opened by pneumatic control, a diaphragm opening control pipeline for controlling the opening of the sealing diaphragm is connected to a pipeline between the sealing diaphragm and the pneumatic oil drain valve, a diaphragm opening control valve is further arranged in the pneumatic control valve group, the diaphragm opening control pipeline is communicated to the gas outlet of the diaphragm opening control valve, and the gas inlet of the diaphragm opening control valve is communicated with the gas outlet of the gas source main valve.
The transmission connecting rod is composed of three rods and two shafts, and connecting rods at two ends are respectively connected with a valve core rotating shaft of a pneumatic oil discharge valve on an oil discharge pipeline and a linkage valve on a nitrogen injection pipeline.
The air source main valve, the diaphragm opening control valve, the oil discharge control valve and the nitrogen injection control valve are two-position three-way electromagnetic valves, wherein an exhaust port communicated with the atmosphere is communicated with an outlet pipeline communicated with the atmosphere when the valves are powered off.
A pneumatic cut-off valve is arranged on a connecting pipeline of the transformer and the oil storage cabinet, and when a pneumatic oil drain valve in the fire-fighting cabinet is opened, the pneumatic cut-off valve is controlled to be closed.
An oil discharge pipeline is connected to the transformer oil storage cabinet, a pneumatic oil discharge valve of the oil storage cabinet is arranged, when the pneumatic oil discharge valve in the fire-fighting cabinet is opened, the pneumatic oil discharge valve of the oil storage cabinet is controlled to be opened, and insulating oil in the oil storage cabinet is discharged into an oil storage pool through the pipeline.
The transformer is provided with a photoelectric sensor for detecting an optical signal inside the transformer oil tank, and when the photoelectric sensor detects a fire optical signal, the photoelectric sensor triggers the oil discharge pipeline to be opened and the nitrogen injection pipeline to be opened as one of necessary conditions.
A pressure sensor for detecting the internal pressure of the transformer oil tank is arranged on the transformer oil tank or a pipeline for connecting the transformer with the pneumatic oil discharge valve, and when the pressure sensor detects the pressure of 60KPa or more, the pressure sensor triggers the opening of an oil discharge pipeline as one of necessary conditions for oil discharge, nitrogen injection and fire extinguishing.
Technical characteristics
This oil-immersed transformer gas accuse oil extraction notes nitrogen extinguishing device has following advantage:
1. on an oil discharge pipeline, an oil discharge ball valve opened by air control is adopted to replace a heavy hammer electromagnetic pin of a traditional product to open an oil discharge butterfly valve, so that the reliability and the safety of an oil discharge mechanism are greatly improved, and the risk of misoperation and operation refusal is solved; the ball valve is adopted to replace a butterfly valve, so that the sealing reliability is improved;
2. on the nitrogen injection pipeline, a pneumatic nitrogen injection ball valve is adopted to replace an electromagnetic valve of a traditional product to control nitrogen release, so that the anti-interference capability and the anti-misoperation capability of the nitrogen release are improved; meanwhile, the interlocking valve is arranged on the nitrogen injection pipeline and is in mechanical linkage with the pneumatic oil discharge valve, so that the nitrogen injection after oil discharge can be ensured, and the safety of nitrogen injection and the reliability of sealing are improved; the mechanical linkage adopts a transmission connecting rod consisting of three rods and two shafts, and connecting rods at two ends are respectively connected with a pneumatic oil discharge valve and a nitrogen injection mechanical linkage valve opening and closing rotating shaft, so that the structure is simple, reliable and practical;
3. in the pneumatic control valve group, all control electromagnetic valves adopt exhaust type two-position three-way electromagnetic valves, and air outlets are normally open to the atmosphere under the condition of no power supply, so that system misoperation caused by valve air leakage can be avoided, and the reliability of pneumatic control is greatly improved; meanwhile, an independent main valve is arranged, a two-position three-way electromagnetic valve is also adopted, the air outlet is normally open to the atmosphere under the condition of no power supply, and a high-power electromagnetic valve with stronger anti-interference capability can be selected. The influence of strong electromagnetic interference on the system can be isolated due to the adoption of pneumatic control;
4. the pneumatic oil drain valve is characterized in that a pneumatic control opened sealing membrane is arranged at the outlet of the pneumatic oil drain valve on the oil drain pipeline, the sealing membrane is opened firstly through air pressure, and then the oil drain valve is opened, so that the oil drain pipeline can be effectively sealed, and oil can be discharged by mistake;
5. the scheme increases necessary conditions for judging the light detection and pressure detection of transformer fault oil discharge and nitrogen injection, and can effectively improve the reliability and effectiveness of automatic start of the oil discharge and nitrogen injection fire extinguishing system;
6. the oil discharge valve and the nitrogen injection valve are both pneumatic control valves, so that oil discharge and nitrogen injection can be remotely and rapidly started, oil discharge and nitrogen injection can be remotely closed, and the problem that the existing oil discharge and nitrogen injection fire extinguishing system cannot be remotely controlled to be closed after being started is solved;
7. the method can be used for the reconstruction of the existing accident oil discharge pipeline and the updating of the oil discharge pipeline and the nitrogen injection pipeline of the existing oil discharge and nitrogen injection fire extinguishing system, the system reliability can be greatly improved, and the safety level of the transformer is improved.
Drawings
Fig. 1 is a schematic structural diagram of a fire-fighting cabinet of a pneumatic-control oil-discharging nitrogen-injecting fire-extinguishing device of an oil-immersed transformer.
Fig. 2 is a front view of a mechanical linkage mechanism of the pneumatic control oil discharge and nitrogen injection fire extinguishing device of the oil immersed transformer.
Fig. 2a is a side view of a mechanical linkage mechanism of a pneumatic control oil discharge and nitrogen injection fire extinguishing device of an oil immersed transformer.
Fig. 3 is a schematic diagram of an embodiment of a pneumatic-control oil-discharging nitrogen-injecting fire extinguishing device for an oil immersed transformer.
Fig. 4 is a schematic diagram of a second embodiment of a pneumatic-control oil-discharging nitrogen-injecting fire extinguishing device for an oil immersed transformer.
Fig. 5 is a schematic diagram of a third embodiment of a pneumatic-control oil-discharging nitrogen-injecting fire extinguishing device for an oil immersed transformer.
Wherein: 1-maintenance valve, 2-pneumatic oil discharge valve, 3-sealing diaphragm, 4-oil leakage monitoring window, 5-nitrogen cylinder, 6-gas cylinder main valve, 7-pressure reducing valve group, 8-gas source main valve, 9-linkage valve, 10-transmission connecting rod, 11-oil gas isolating valve, 12-nitrogen injection valve, 13-nitrogen injection valve pneumatic actuator, 14-nitrogen injection control valve, 15-nitrogen injection valve opening control pipeline, 16-oil discharge and nitrogen injection closing control valve, 17-oil discharge and nitrogen injection valve closing control pipeline, 18-diaphragm opening control valve, 19-oil discharge control valve, 20-oil discharge opening control pipeline, 21-diaphragm opening control pipeline, 22-oil discharge valve pneumatic actuator, 23-pressure switch, 24-pneumatic stop valve, 25-stop valve pneumatic actuator, 26-oil storage cabinet pneumatic oil discharge valve, 27-oil storage cabinet oil discharge valve pneumatic actuator, 28-pressure sensor, 29-photoelectric sensor.
Detailed Description
The first implementation example is as follows:
as shown in fig. 1 to 3, in the air-controlled oil-discharging nitrogen-injecting fire extinguishing device for the oil-immersed transformer, an oil-discharging pipeline communicated with an oil tank of the transformer enters a fire-fighting cabinet, and is sequentially connected with an overhaul valve 1, a pneumatic oil-discharging valve 2 and a sealing diaphragm 3, and an outlet of the sealing diaphragm 3 enters an underground oil pool through a connecting pipeline of an oil-leakage monitoring window 4; and a nitrogen injection pipeline communicated with the transformer oil tank enters the fire-fighting cabinet and is sequentially connected with a linkage valve 9, an oil-gas isolation valve 11, a nitrogen injection valve 12, an air source main valve 8, an air bottle main valve 6 and a nitrogen bottle 5. Wherein, the pressure reducing valve group 7 comprises a pressure meter and a pressure alarm switch. The pneumatic oil drain valve 2 and the linkage valve 9 realize mechanical linkage through a transmission connecting rod 10. A three-way pipeline is arranged between the nitrogen injection valve 12 and the air source main valve 8 and is connected to a combined air inlet of a pneumatic control valve group, and the pneumatic control valve group consists of a membrane opening control valve 18, an oil discharge control valve 19, a nitrogen injection control valve 14 and an oil discharge and nitrogen injection closing control valve 16. The air outlet end of the 'membrane opening control valve' 18 is connected with a 'membrane opening control pipeline' 21 and communicated with a pipeline between the 'sealing membrane' 3 and the 'pneumatic oil drain valve' 2; an air outlet end of an oil discharge control valve 19 is connected with an oil discharge opening control pipeline 20 to a valve opening driving port (air inlet) A of an oil discharge valve pneumatic actuator 22; the air outlet end of the nitrogen injection control valve 14 is connected with a nitrogen injection valve opening control pipeline 15 to a valve opening driving port (air inlet) A of a nitrogen injection valve pneumatic actuator 13; the air outlet end of the oil discharge and nitrogen injection closing control valve 16 is connected with an oil discharge and nitrogen injection closing control pipeline 17 to a valve closing driving port (air inlet) B of an oil discharge valve pneumatic actuator 22 and a nitrogen injection valve pneumatic actuator 13 respectively; a "pressure switch" 23 is arranged on the pipeline between the "pneumatic oil drain valve" 2 and the "sealing diaphragm" 3 and sends a feedback signal when the sealing diaphragm is opened. The components and piping system are shown in fig. 3. When the connection enters a working state, the maintenance valve 1 is in an open state, the pneumatic oil discharge valve 2 is in a closed state, the linkage valve 9 is in a closed state, the nitrogen injection valve 12 is in a closed state, and all control valves in the air source main valve 8 and the pneumatic control valve group are in a closed state which cannot be electrified. The pressure reducing valve group 7, the gas cylinder main valve 6 and the nitrogen cylinder 5 jointly form a nitrogen source, the gas cylinder main valve 6 is in an open state when in a manual mode, and can be combined with or simultaneously opened by the gas source main valve 8 if a flat head electromagnetic valve is adopted.
The working process is as follows: when the transformer normally operates, the manual 'gas cylinder main valve' 6 is in an open state, the 'gas source main valve' 8 is in a closed state, high-pressure nitrogen in the 'nitrogen cylinder' 5 is decompressed to 0.6-0.8MPa through the 'decompression valve group' 7, the air pressure is isolated downwards by the 'gas source main valve' 8, and the 'gas source main valve' 8 is of a two-position three-way valve type, and the gas outlet end of the 'gas source main valve' 8 is communicated with the atmosphere; all the control valves of the pneumatic control valve group are in a closed state, a two-position three-way valve type is selected, and the air outlet end is communicated with the atmosphere, so that all the pneumatic control pipelines are communicated with the atmosphere and are in a normal pressure state. When a transformer has a serious fault, a pressure release valve action signal, a heavy gas action signal, a breaker tripping signal and a fire detector send signals, an air source main valve 8 is powered on and opened, a diaphragm opening control valve 18 is powered on and opened, nitrogen enters a pipeline between a diaphragm opening control pipeline 21 and a pneumatic oil discharge valve 2 and a sealing diaphragm 3, when the pressure reaches above 0.06MPa, a diaphragm is exploded, a pressure switch 23 sends a diaphragm opening feedback signal and triggers the diaphragm opening control valve 18 to lose power and close and a fuel discharge control valve 19 to be powered on and opened, the nitrogen enters a fuel discharge opening control pipeline 20 and reaches a fuel discharge valve pneumatic actuator 22 valve opening air inlet A and drives the pneumatic oil discharge valve 2 to open, the pneumatic oil discharge valve 2 is opened while a linkage valve 9 on a nitrogen injection pipeline is driven by a transmission connecting rod 10 to open, at the moment, the oil discharge pipeline of the transformer is opened to realize oil discharge. According to setting, after delaying for a plurality of seconds (2-30 seconds are adjustable), the nitrogen injection control valve 14 is powered on and opened, nitrogen reaches the nitrogen injection valve pneumatic actuator 13 through the nitrogen injection valve opening control pipeline 15 to open the valve opening air inlet A and drive the nitrogen injection valve 12 to open, and the nitrogen enters the transformer through the nitrogen injection pipeline, so that stirring cooling and covering fire extinguishing of transformer oil are realized. The 'oil drain valve pneumatic actuator' 22 and the 'nitrogen injection valve pneumatic actuator' 13 are both provided with opening and closing contact signal feedback, and the electricity is stopped after a delay of several seconds after receiving the opening in-place signal. When oil drainage and nitrogen injection are required to be closed, the oil drainage and nitrogen injection closing control valve 16 is powered on to be opened, nitrogen respectively flows to the valve closing air inlet B of the oil drainage valve pneumatic actuator 22 and the valve closing air inlet B of the nitrogen injection valve pneumatic actuator 13 through the oil drainage and nitrogen injection closing control pipeline 17, and the pneumatic oil drainage valve 2 and the nitrogen injection valve 12 are driven to be closed.
Wherein, the 'sealing diaphragm' 3, the 'pneumatic oil drain valve' 2 and the 'nitrogen injection valve' 12 are all provided with opening indication signals, and simultaneously, nitrogen injection and oil drain state signals can be also arranged and fed back to the background control system. The sealing membrane 3 can be a stainless steel positive arch rupture disk or other metal or non-metal membranes which can be rapidly ruptured under certain pressure, can ensure reliable sealing of an oil discharge pipeline when the transformer normally operates, and can be ruptured through remote control of air pressure when fire hazard exists.
The pneumatic actuator is a part of a pneumatic valve, the pneumatic oil discharge valve 2 and the oil discharge valve pneumatic actuator 22 jointly form a pneumatic oil discharge valve, the nitrogen injection valve 12 and the nitrogen injection valve pneumatic actuator 13 jointly form a pneumatic nitrogen injection valve, and the pneumatic nitrogen injection valve and the nitrogen injection valve pneumatic actuator can be selected from conventional products sold on the market, such as the pneumatic oil discharge valve is selected from models Q641F-16P, and the pneumatic nitrogen injection valve is selected from models Q611F-16P.
The pneumatic oil drain valve and the pneumatic nitrogen injection valve can adopt pneumatic valves with structures such as a pneumatic butterfly valve, a pneumatic ball valve and the like. When the pneumatic ball valve is adopted, the sealing of the ball valve is relatively reliable, so that a sealing diaphragm 3 can be eliminated, a diaphragm opening control valve 18 and a diaphragm opening control pipeline 21 are eliminated from the pneumatic control valve group, and the device is simpler; however, if a pneumatic butterfly valve is adopted, a sealing diaphragm must be adopted for secondary sealing because the butterfly valve is unreliable in sealing. The pneumatic valve can also be selected to be only opened with a single pneumatic normally closed valve, such as a pneumatic stop valve, a diaphragm valve and the like, and the driving air source unit can reduce one path of air supply. The linkage valve 9 on the nitrogen injection pipeline can be a ball valve with reliable sealing. The oil leakage monitoring window 4 on the oil drainage pipeline is not necessary to be arranged and is usually selected according to the requirements of users, and the work of the device is not influenced.
The linkage valve 9 on the nitrogen injection pipeline is mechanically linked with the pneumatic oil discharge valve through a transmission connecting rod 10, the transmission connecting rod 10 is a three-rod two-shaft mechanism consisting of swing rods at two ends and a connecting rod in the middle, and the swing rods at two ends are respectively connected with a rotating shaft synchronous with a valve core on an oil discharge pneumatic actuator 22 of the pneumatic oil discharge valve and a valve core shaft of the linkage valve 9. The linkage valve 9 is synchronously opened or closed along with the pneumatic oil discharge valve, so that oil discharge and nitrogen injection linkage control can be realized, nitrogen injection misoperation during oil discharge is avoided, and the reliability and safety of the oil discharge and nitrogen injection fire extinguishing system are improved. A schematic of the mechanical linkage is shown in fig. 2 and 2 a.
In the pneumatic control unit, an air source main valve 8, a diaphragm opening control valve 18, an oil discharge control valve 19, a nitrogen injection control valve 14 and an oil discharge nitrogen injection closing control valve 16 all adopt exhaust type two-position three-way electromagnetic valves, the electromagnetic valves are closed when the air outlet is communicated with the atmosphere in a power-off state, and the electromagnetic valves are closed when power is supplied, so that system misoperation caused by air leakage of the valves can be avoided, and the reliability of pneumatic control is greatly improved.
In order to prevent the insulating oil of the transformer from entering a nitrogen pipeline, an oil-gas isolating valve 11 is arranged at the lower end of the linkage valve 9. In order to realize nitrogen injection flow adjustment, a flow regulating valve can be arranged at the front end or the rear end of the nitrogen injection valve 12, and a high-sealing low-leakage valve can be additionally arranged to further prevent nitrogen from entering by mistake.
The oil discharge and nitrogen injection closing control valve 16 can realize the closing of oil discharge and nitrogen injection, and solves the problem that the existing oil discharge and nitrogen injection fire extinguishing system cannot be closed remotely after being opened.
Example two:
as shown in figure 4, the pneumatic control oil-discharging nitrogen-injecting fire extinguishing device for the oil immersed transformer separates a pneumatic control valve group from a fire-fighting cabinet beside the transformer to the safety side of a fire wall, and a pneumatic control unit can be arranged on the safety side of the fire wall in a control box mode, so that the oil-discharging nitrogen-injecting fire extinguishing operation can be controlled in the safety area on site. The pneumatic control unit comprises a pneumatic control valve group, a gas source main valve, a pressure reducing valve group and a nitrogen cylinder. Both the main valve and the control valve can be set to be manual control and electric control. The execution parts of a pneumatic oil discharge valve 2, a nitrogen injection valve 12, a nitrogen cylinder 5 and the like are arranged in a fire-fighting cabinet beside the transformer, and an oil discharge port at the lower part of a sealing membrane 3 is communicated with an underground oil pool. Each control pipeline is communicated between the fire-fighting cabinet and the pneumatic control unit, and the control pipelines are stainless steel pipes. An air inlet of an air source main valve 8 in the pneumatic control unit is connected with a pressure reducing valve group 7, an outlet of the air source main valve 8 is connected with an air inlet of the pneumatic control valve group, a power air source is provided for a diaphragm opening control valve 18, an oil discharging control valve 19, a nitrogen injection control valve 14, an oil discharging and nitrogen injection closing control valve 16, and the power air source is used for controlling pneumatic actuating mechanisms such as a pneumatic oil discharging valve 2, a sealing diaphragm 3 and a nitrogen injection valve 12 in the fire fighting cabinet to work, and the working process is the same as that of the first embodiment.
Example three:
as shown in fig. 5, on the basis of the first or second technical solutions of the embodiments, a normally open pneumatic "cut-off valve" 24 is disposed on a pipeline connecting an oil conservator of a transformer and an oil tank of the transformer, and a control pipeline controlling the closing of the pneumatic "cut-off valve" 24 is connected in parallel to an "oil discharge opening control pipeline" 20. When the transformer has serious faults and a fire disaster occurs, the pneumatic cut-off valve 24 of the oil storage cabinet is closed while oil is discharged, and the insulation oil in the oil storage cabinet is isolated from the transformer.
The lower part of the transformer oil conservator is connected with a pipeline leading to an oil conservator at the lower part of the transformer, the upper part of the pipeline is provided with a normally closed 'oil conservator pneumatic oil drain valve' 26, and a control pipeline controlling the opening of the pneumatic oil drain valve is connected in parallel to an 'oil drain opening control pipeline' 20. After the oil-discharging nitrogen-injecting fire-extinguishing pipeline of the transformer is opened due to serious faults, the pneumatic oil-discharging valve 15 of the oil storage cabinet is opened through pneumatic control, and insulating oil in the oil storage cabinet flows into an oil storage pool at the lower part of the transformer.
The pneumatic stop valve 24 and the pneumatic oil drain valve 26 of the oil conservator can be provided with manual actuators for controlling the opening and closing of the valves.
A pressure sensor 28 is arranged on a transformer oil tank to acquire a pressure signal inside the transformer, the pressure sensor 28 is communicated with insulating oil inside the transformer oil tank to detect oil pressure, when the oil pressure inside the transformer is close to a dangerous pressure value (the allowable pressure of the transformer oil tank, the oil tank has a cracking risk), a signal is sent out, and the signal is used as one of necessary conditions for starting oil discharge and nitrogen injection of the transformer and is used for determining whether an oil discharge gas control device is started or not.
A photoelectric sensor 29 is arranged on a transformer oil tank to collect light wave signals inside the transformer, and the photoelectric sensor 29 collects arc light waves and flame light waves generated inside the transformer through a light guide element and sends signals which are used as one of necessary conditions for starting the transformer to discharge oil and inject nitrogen and are used for determining whether an air control oil discharge device is started or not.
At present, the existing oil-discharging nitrogen-injecting fire extinguishing device for the transformer has the necessary conditions for starting the oil discharging of the transformer, including: the gas relay is used for receiving a heavy gas action signal, a circuit breaker tripping signal, a pressure release valve action signal and a transformer external flame signal. The reliability of the flame signal outside the transformer is poor, and the internal faults and risks of the transformer cannot be represented, so that the increase of the light wave signal acquisition inside the transformer and the pressure acquisition inside the transformer have important significance in reliably implementing oil discharge and nitrogen injection of the transformer.
This patent transformer gas accuse oil extraction nitrogen injection device can add the maintenance valve after annotating the nitrogen pipeline and getting into the fire control cabinet, under closing oil extraction pipeline maintenance valve and annotating nitrogen pipeline maintenance valve state, regularly carries out system simulation operation test, and whether the test system device is normal. If the nitrogen injection pipeline is not provided with the maintenance valve, the mechanical interlocking between the interlocking valve and the oil discharge valve can be disconnected, and then a simulation test is carried out.
Claims (10)
1. An oil immersed transformer gas control oil discharge nitrogen injection fire extinguishing device comprises a transformer oil discharge pipeline and a valve, a transformer nitrogen injection pipeline and a valve; the method is characterized in that: the transformer oil discharge pipeline is connected with a pneumatic oil discharge valve which is controlled to be opened and closed pneumatically; the transformer nitrogen injection pipeline is connected with a pneumatic nitrogen injection valve which is controlled to be opened and closed pneumatically, and is also connected with a linkage valve which is mechanically linked with a pneumatic oil discharge valve on the oil discharge pipeline in series; valve core rotating shafts of the pneumatic oil drain valve and the linkage valve are connected through a transmission connecting rod, and when the pneumatic oil drain valve is opened and closed on an oil drain pipeline, the linkage valve is driven to be opened and closed through the transmission connecting rod.
2. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 1, further characterized in that: the transformer oil discharge pipeline and the transformer nitrogen injection pipeline both enter the fire-fighting cabinet, the oil discharge pipeline enters the fire-fighting cabinet and is sequentially connected with the overhaul valve, the pneumatic oil discharge valve and the oil leakage monitoring window, and then the oil discharge pipeline extends out of the fire-fighting cabinet and enters the oil storage pool; the nitrogen injection pipeline enters the fire-fighting cabinet and is sequentially connected with the linkage valve, the oil-gas isolation valve, the pneumatic nitrogen injection valve, the gas source main valve and the nitrogen source.
3. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 2, further characterized in that: a pipeline is arranged between the outlet of the air source main valve and the pneumatic nitrogen injection valve and leads to an air inlet of the pneumatic control valve group; the pneumatic control valve group comprises an oil discharge control valve, a nitrogen injection control valve and an oil discharge nitrogen injection closing control valve; the outlet of the oil discharge control valve is connected with the opening driving port of the pneumatic actuator of the pneumatic oil discharge valve through a pipeline, the outlet of the nitrogen injection control valve is connected with the opening driving port of the pneumatic actuator of the pneumatic nitrogen injection valve through a pipeline, and the outlet of the oil discharge nitrogen injection closing control valve is simultaneously connected with the closing driving ports of the pneumatic oil discharge valve and the pneumatic nitrogen injection valve pneumatic actuator through pipelines.
4. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 2, further characterized in that: the outlet of the pneumatic oil drain valve is provided with a pneumatically opened sealing diaphragm, a diaphragm opening control pipeline for controlling the opening of the sealing diaphragm is connected to a pipeline between the sealing diaphragm and the pneumatic oil drain valve, a diaphragm opening control valve is further arranged in the pneumatic control valve group, the diaphragm opening control pipeline is communicated to the gas outlet of the diaphragm opening control valve, and the gas inlet of the diaphragm opening control valve is communicated with the gas outlet of the gas source main valve.
5. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 1, further characterized in that: the transmission connecting rod is composed of three rods and two shafts, and connecting rods at two ends are respectively connected with a valve core rotating shaft of a pneumatic oil discharge valve on an oil discharge pipeline and a linkage valve on a nitrogen injection pipeline.
6. An oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 2 or 3, further characterized in that: the air source main valve, the diaphragm opening control valve, the oil discharge control valve and the nitrogen injection control valve are two-position three-way electromagnetic valves, wherein an exhaust port communicated with the atmosphere is communicated with an outlet pipeline communicated with the atmosphere when the valves are powered off.
7. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 2, further characterized in that: a pneumatic cut-off valve is arranged on a connecting pipeline of the transformer and the oil storage cabinet, and when a pneumatic oil drain valve in the fire-fighting cabinet is opened, the pneumatic cut-off valve is controlled to be closed.
8. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 2, further characterized in that: an oil discharge pipeline is connected to the transformer oil storage cabinet, a pneumatic oil discharge valve of the oil storage cabinet is arranged, when the pneumatic oil discharge valve in the fire-fighting cabinet is opened, the pneumatic oil discharge valve of the oil storage cabinet is controlled to be opened, and insulating oil in the oil storage cabinet is discharged into an oil storage pool through the pipeline.
9. The oil-immersed transformer pneumatic control oil discharge nitrogen injection fire extinguishing device according to claim 1, further characterized in that: the transformer is provided with a photoelectric sensor for detecting an optical signal inside the transformer oil tank, and when the photoelectric sensor detects a fire optical signal, the photoelectric sensor triggers the oil discharge pipeline to be opened and the nitrogen injection pipeline to be opened as one of necessary conditions.
10. The oil-immersed transformer pneumatic control oil discharge and nitrogen injection fire extinguishing device according to claim 1, further characterized in that: a pressure sensor for detecting the internal pressure of the transformer oil tank is arranged on the transformer oil tank or a pipeline for connecting the transformer with the pneumatic oil discharge valve, and when the pressure sensor detects the pressure of 60KPa or more, the pressure sensor triggers the opening of an oil discharge pipeline as one of necessary conditions for oil discharge, nitrogen injection and fire extinguishing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921766798 | 2019-10-21 | ||
| CN2019217667985 | 2019-10-21 |
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| CN202021347286.8U Active CN213100536U (en) | 2019-10-21 | 2020-07-10 | Oil-immersed transformer gas control oil discharge nitrogen injection fire extinguishing device |
| CN202021346108.3U Active CN213049093U (en) | 2019-10-21 | 2020-07-10 | Pneumatic oil-discharging nitrogen-injecting fire extinguishing system for transformer |
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2020
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