CN105185543A - Explosion-proof 75MVA transformer - Google Patents
Explosion-proof 75MVA transformer Download PDFInfo
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- CN105185543A CN105185543A CN201510678491.XA CN201510678491A CN105185543A CN 105185543 A CN105185543 A CN 105185543A CN 201510678491 A CN201510678491 A CN 201510678491A CN 105185543 A CN105185543 A CN 105185543A
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Abstract
The invention discloses an explosion-proof 75MVA transformer. The explosion-proof 75MVA transformer comprises a fire extinguishing mechanism, a pressure releasing mechanism, a leak detecting mechanism and a control mechanism which are connected onto a transformer body, wherein an explosion-proof system of the transformer comprises a control unit, a purifying unit, a leak detection unit, a fire extinguishing unit, a pressure releasing unit and a transformer unit; the purifying unit, the leak detection unit, the fire extinguishing unit, the pressure releasing unit and the transformer unit are regulated and controlled in a unified manner through the control unit. The explosion-proof 75MVA transformer has the benefits that transformer explosion can be effectively prevented, personal safety and property safety can be protected, the structure can monitor different parts on a winding, and in-time early-warning and explosion-proof actions can be finished when in a short circuit. Cooling of the short circuit parts can be primarily conducted, meanwhile fire extinguishing gas can be uniformly sprayed at the top of the transformer, the explosion-proof means can be strengthened, pressure release of the transformer can be conducted in time, and meanwhile waste of transformer oil can be avoided. Sensors of the transformer are prepared by adopting a special material, so that relatively strong sensitivity is achieved, and false operation or false alarm of the transformer can be effectively prevented.
Description
Technical field
The present invention relates to a kind of explosion-proof 75MVA transformer.
Background technology
Along with the development of science and technology, transformer voltage grade is more and more higher, and capacity is increasing, careless slightlyly just easily leads to major break down, and the security reliability of power supply becomes more important.Being called as active anti-explosion fire fire-extinguishing apparatus, is the loyal guard of oil-immersed type transformer, will more be widely used in transformer station and power station, will produce make larger contribution for national power plant and substation safety.The oil-immersed type transformer of 75MVA is one of power equipment of the main application of power plant and transformer station.The cracking corrosiveness of the long-term running overload of transformer, insulating oil all can cause winding insulation aging, rotten, dielectric strength is reduced, loses insulating effect time serious, cause winding interturn short-circuit; Transformer water inlet makes dielectric strength reduce and cause turn-to-turn short circuit; Welding slag, the foreign material (as screen pack and activated alumina) such as ferromagnetic enter transformer, and workmanship is bad all can cause winding interturn short-circuit.Winding be short-circuited fault time produce electrical discharge arc, its temperature reaches more than 3000 DEG C, and insulating oil, under high temperature action, decomposites the fuel gas such as a large amount of hydrogen, acetylene, methane.Simultaneous internal pressure constantly increases, and when pressure exceedes the mechanical strength of fuel tank, oil spout or fuel tank explosion will occur.Reach finite concentration when fuel gas mixes with air, the transformer oil in casing burns at once.Transformer oil a large amount of abrim in transformer, transformer oil flash-point is about 135 DEG C, and burning-point is 165 DEG C ~ 190 DEG C, and self-ignition point is about 330 DEG C.Transformer oil is a kind of is flammable iknsulating liquid, so selecting to install, use during oil-immersed type transformer and will adopt fire prevention measure, particularly in Automatization Technology in Transformer Substation, more should select the fire-extinguishing apparatus of initiative, guaranteeing the security reliability of transformer station.When transformer breaks down, if the rupture disk of pressure detector, on-load voltage regulating switch and sleeve pipe and explosion inductor cannot send signal, anti-explosion fire system just can be named as by traditional nitrogen extinguishing method, and " discharge and stir " makes reinforcement.This in period system by two signal enablings: the high temperature signal from flame detector adds electic protection (ground connection; pressure relief valve; high electric current or gas) one of them signal in order to increase detection fire (any source) area, the hygrosensor of transformer-cabinet, on-load voltage regulating switch and sleeve pipe can link together.
Summary of the invention
The object of the invention is to: for above-mentioned Problems existing; a kind of explosion-proof 75MVA transformer is provided; can make effectively to prevent Explosion of Transformer; the protection person and the safety of property, and when short circuit, timely early warning and complete explosion-proof action; can lower the temperature for the position of short circuit by emphasis; strengthen explosion-proof means, can bleed off pressure transformer in time, the waste of transformer oil can be avoided simultaneously.Can the misoperation of effective anti-locking apparatus or false alarm.Can by unified for explosion protection system regulation and control, make the cooperation that unit is good, the more effective raising explosion-proof of the system between unit can be made, the accident that each pressure sensor causes when can reduce signal wrong report, improve explosion-proof effect safely and effectively, reduce the pressure of inside transformer, so that prevent the generation of second accident.Avoid the waste of transformer oil simultaneously, in time transformer oil shifted and lower the temperature, purify.The security reliability of explosion-proof fire-extinguishing system is effectively provided.
The technical solution used in the present invention is as follows:
The invention discloses a kind of explosion-proof 75MVA transformer, comprise the fire suppression mechanism be connected on transformer, pressure release mechanism, leakage detecting device and controlling organization;
Described transformer, comprises housing, conservator, iron core, winding; Conservator is located at housing upper end, and is connected by pipeline with housing, and this pipeline is provided with Buchholz relay and cut-off valve; The winding of three-phase is located in housing, in winding, be enclosed with iron core, respectively arranges a temperature sensor in upper, middle and lower three positions of the winding of three-phase; A pressure sensor is set respectively in the upper, middle and lower of housing;
Described fire suppression mechanism, comprises fire extinguishing box, fire suppression bottle, gas boosting pump; Fire suppression bottle is arranged in fire extinguishing box, and on the top of hull outside and the winding of three-phase, the relative position in middle part, bottom is connected to electromagnetically operated valve; The electromagnetically operated valve of bottom and the electromagnetically operated valve at middle part are connected on the electromagnetically operated valve of fire suppression bottle respectively by pipeline; The electromagnetically operated valve on top connects gas boosting pump by pipeline, and this gas boosting pump is arranged on the top of fire extinguishing box, and gas boosting pump is connected with the electromagnetically operated valve of fire suppression bottle; Pressure sensor is provided with for detecting the pressure of this electromagnetically operated valve place fire-suppressant gas at the electromagnetically operated valve place be connected with housing; Fire suppression bottle is provided with heater;
Described pressure release mechanism, comprises oil extraction case, oil extraction pond, oil drain pump, igniter; The below of transformer is located at by oil extraction case, is connected with an electromagnetically operated valve respectively at the middle part of transformer shell and lower outside, and is connected in oil extraction case by this valve with electrically motorized operation; Be provided with oil drain out at oil extraction lower box part, this oil drain out place is provided with safety valve; Safety valve is connected with outside the housing upper of transformer, this safety valve is communicated in oil extraction pond by upper oil exit pipe, oil extraction is provided with water film in pond, the outlet of upper oil exit pipe is arranged in water layer, oil drain pump is arranged on on oil exit pipe for oil extraction, upper oil exit pipe through fire extinguishing box, and is provided with heat exchanger between upper oil exit pipe and fire suppression bottle; Be connected with exhaust outlet on the top in oil extraction pond by pipeline, this exhaust outlet be located at away from transformer at least 12m position and this exhaust ports is provided with igniter; Case top is provided with pressure relief valve, and this pressure relief valve is connected to exhaust outlet by pipeline
Described leakage detecting device, comprises heat insulation loop, and heat insulation loop is set in pressure release mechanism, junction between fire suppression mechanism and transformer three or between its inner each parts, has temperature sensor in the arranged outside of heat insulation loop;
Described controlling organization, comprises controller, communicator; Be located at leakage detecting device, pressure release mechanism, fire suppression mechanism or transformer to be connected by cable with controller, communicator is connected by cable with controller, and communicator is connected with external network by optical fiber.
Further, described housing internal upper part is provided with nozzle mechanism, this nozzle mechanism is connected with the electromagnetically operated valve of housing upper, nozzle mechanism comprises spray seat, shower nozzle and connector, shower nozzle is connected by connector with spray seat, has the booster cavity of taper in shower nozzle, and shower nozzle adopts atomizer, connector is active connection, and this connector makes shower nozzle reciprocating motion thus evenly sprays.
Further, described oil extraction case is connected with purification mechanism, and this purification mechanism comprises self-fractionating pump, clarifier and magnetic separator.
Further, be provided with fuel level sensor, temperature sensor, pressure sensor in described oil extraction case, the tank wall lateral wall of oil extraction case is provided with radiator, and row's tank bottoms is provided with magnet strip.
Further, the two ends of described oil drain pump are parallel with unidirectional valve.
Further, described fire suppression bottle comprises helium tank, nitrogen pot, heptafluoro-propane tank, arranges gas and vapor permeation mechanism on the top of fire suppression bottle.
Further, the current-carrying part in described pressure sensor, temperature sensor or fuel level sensor is made up of grapheme material.
Due to said mechanism; can make effectively to prevent Explosion of Transformer; the protection person and the safety of property, this structure to all can monitor everywhere on winding, and when short circuit; timely early warning and complete explosion-proof action; can lower the temperature for the position of short circuit by emphasis, evenly spray fire-suppressant gas at transformer top simultaneously, strengthen explosion-proof means; can bleed off pressure transformer in time, the waste of transformer oil can be avoided simultaneously.Its each transducer adopts special material to make to have stronger, sensitivity, can the misoperation of effective anti-locking apparatus or false alarm.
Further, the explosion protection system of this transformer, comprising:
Control unit;
Transformer unit, comprises housing, conservator, iron core, winding; Conservator is fixed on case top and is communicated in housing by Buchholz relay and cut-off valve; The winding of three-phase is located in housing, is enclosed with iron core in each winding, respectively arranges a temperature sensor in upper, middle and lower three positions of each winding; A pressure sensor is set respectively in the upper, middle and lower of housing, for detecting oil temperature in housing or methane gas temperature; The below of transformer is provided with basement;
Pressure relief unit, comprises oil extraction case, oil extraction pond, oil drain pump, igniter, pressure relief valve; Oil extraction case is located in the basement of the below of transformer, and at the middle part of transformer shell and lower outside homogeneous electromagnetically operated valve, two electromagnetically operated valves are also connected with oil extraction case after connecting; Be provided with oil drain out at oil extraction lower box part, oil drain out is provided with the safety valve that rated pressure is 55kpa; Being connected with a rated pressure outside the housing upper of transformer is 52kpa safety valve, this safety valve is switched in oil extraction pond by upper oil exit pipe, the water film that thickness is 10-20cm is provided with in oil extraction pond, the outlet of upper oil exit pipe is arranged in water film, oil drain pump is arranged on extraction speed oil exit pipe being accelerated its oil and is convenient to oil extraction, and upper oil exit pipe is through the middle part of fire extinguishing box; Be parallel with a Unidirectional solenoid valve in the both sides of oil drain pump, the pipeline being 5-8cm by caliber above oil extraction pond is connected with exhaust outlet, and this exhaust outlet away from transformer at least 12m, and is provided with igniter in this exhaust ports; Igniter is by being connected with control unit; The rated pressure of pressure relief valve is 45kpa-50kpa, this pressure relief valve by pipeline communication to exhaust outlet;
Gas mixing units, comprise blender, electromagnetically operated valve, fire suppression bottle, fire suppression bottle comprises helium tank, nitrogen pot, heptafluoro-propane tank, fire suppression bottle exit is connected with Pressure gauge, pressure sensor, rated pressure are 70kpa electromagnetically operated valve, initial pressure in blender is 100 ± 10%kpa, is provided with hybrid chamber in blender, and hybrid chamber is provided with pressure sensor, the exit of blender is provided with electromagnetically operated valve, and hybrid chamber is connected with the electromagnetically operated valve on fire suppression bottle;
Fire extinguishing unit, comprise gas boosting pump, nozzle mechanism, heater and heat exchanger, nozzle mechanism comprises shower nozzle and spray seat, and spray seat is connected by active connection with shower nozzle; Heat exchanger is arranged between oil exit pipe and fire suppression bottle for heat exchange; Heater is arranged on fire suppression bottle, and fire suppression bottle is connected with pressure sensor; On the top of hull outside and the winding of three-phase, the relative position in middle part, bottom connects an electromagnetically operated valve respectively; The electromagnetically operated valve of bottom is connected with blender with after the electromagnetically operated valve parallel connection at middle part; The electromagnetically operated valve on top connects gas boosting pump by pipeline, and the electromagnetically operated valve on top is connected on the nozzle mechanism of inside transformer simultaneously, and this gas boosting pump is connected with blender; Pressure sensor is provided with for detecting the pressure of this electromagnetically operated valve place fire-suppressant gas at the electromagnetically operated valve place be connected with housing; Fire suppression bottle is provided with heater;
Leak detection unit, comprise heat insulation loop, heat insulation loop ring set, in the junction of pipeline, is outside equipped with temperature sensor at thermal insulation layer, and each temperature sensor is connected with control unit;
Clean unit, comprises self-fractionating pump, clarifier and magnetic separator; The oil drain out place pipe side wall of oil extraction case is connected with clarifier, 50-80 object screen pack is set in the porch of clarifier, in clarifier, be provided with the filtration core of accordion, filtration core adopts the polypropylene of 2-3mm to be that material is made, and is also arranged with thickness 1-1.2mm nonwoven layer outward at filtration core; Be connected with magnetic separator in the exit of clarifier, be provided with magnetic board in the both sides of magnetic separator, between magnetic board, there is parallel magnetic field, be provided with 80-100 object ceramic network in the inside of magnetic separator and thickness is the active carbon net of 3-3.5mm; Be connected with self-fractionating pump in the outlet of magnetic separator, self-fractionating pump is connected to oil extraction box top, and the lateral wall of oil extraction case is provided with radiator, and row's tank bottoms is provided with magnet strip;
Control unit is connected with clean unit, unit of hunting leak, put out a fire unit, pressure relief unit and transformer unit, for gathering the signal of unit and controlling the action of unit and the action that cooperatively interacts, unit the current-carrying part of temperature sensor, pressure sensor or fuel level sensor that uses be made up of Graphene.
Due to said system, can by unified for explosion protection system regulation and control, make the cooperation that unit is good, the more effective raising explosion-proof of the system between unit can be made, the accident that each pressure sensor causes when can reduce signal wrong report, improve explosion-proof effect safely and effectively, the pressure of inside transformer can be reduced to greatest extent, so that prevent the generation of second accident.Avoid the waste of transformer oil simultaneously, in time transformer oil shifted and lower the temperature, purify.The security reliability of explosion-proof fire-extinguishing system is effectively provided.
Further, the explosion-proof method of this explosion protection system:
(1) initial pressure, in its helium tank, nitrogen pot, heptafluoro-propane tank is for being respectively 8 ± 10%MPa, 10 ± 10%MPa, 6.5 ± 10%kpa;
(2), first control unit is opened electromagnetically operated valve above helium tank and note helium in blender, to the air pressure in blender to 20-22kpa, then helium tank electromagnetically operated valve is closed, and controlling nitrogen pot, to note air pressure in nitrogen to blender in blender be 50-53kpa, then nitrogen pot is closed, and control heptafluoro-propane tank open be air pressure in blender to 60-65kpa, then close heptafluoro-propane tank;
(3), by the electromagnetically operated valve at mixer outlet place open, close this electromagnetically operated valve after rising to 15-18kpa atmospherically in the pipeline that blender is connected with transformer, the air pressure now in blender drops to 30-35kpa;
(4), control unit to open or close in helium tank, heptafluoro-propane tank and nitrogen pot to blender air pressure successively to 80kpa, and to make in blender content than helium: heptafluoro-propane: nitrogen=(8.5-9.4): (4.6-5.3): (11.3-15.2); Then continuing to open or close air pressure in helium tank, heptafluoro-propane tank and nitrogen pot to blender successively according to this ratio is 100 ± 10%kpa;
(5), when the Pressure Drop in helium tank, nitrogen pot, heptafluoro-propane is to the 15%-20% of its initial pressure, should supplement in time;
(6), controller according to the position of temperature sensor winding recording maximum temperature value, judge short dot position; After the electromagnetically operated valve at mixer outlet place is opened, control unit is according to the position of short dot, and the electromagnetically operated valve of the fire extinguishing unit that this short dot of command range is nearest opens to lower the temperature to short dot;
(7), control unit is when recording transformer internal short-circuit point temperature higher than 55 DEG C, and control unit sends alarm signal; During higher than 65 DEG C, Buchholz relay detects methane gas simultaneously, and control unit sends light gas alarming signal; During higher than 85 DEG C, Buchholz relay detects the change of oil stream simultaneously, and control unit sends grave gas signal, simultaneously the input power-off of control unit control transformer; When temperature is higher than 95 degrees Celsius, the electromagnetically operated valve of fire extinguishing unit is opened;
(8) after the pressure, in blender reduces, controller controls helium tank, the electromagnetically operated valve on nitrogen pot and heptafluoro-propane tank top partially opens, and with helium: heptafluoro-propane: the ratio of nitrogen=9:4.8:12 enters in blender and is combined into mist is that the air pressure in blender is not less than 95kpa;
(9) when the mean temperature, in transformer is higher than 85 degrees Celsius, control unit controls to open with the electromagnetically operated valve on fire extinguishing unit top, control booster pump to open simultaneously, mist is pressurized to more than 250kpa by booster pump, and sprayed by the nozzle on transformer top, nozzle reciprocating motion, sprays mist uniformly;
(10), the heat exchanger of fire extinguishing unit absorbs the heat of transformer oil of discharging, and heats fire suppression bottle, the pressure of fire suppression bottle raised, is convenient to the helium in fire suppression bottle, heptafluoro-propane or nitrogen and gasifies;
(11), when the air pressure in helium, heptafluoro-propane or nitrogen is lower than 3.3MPa, the heater that controller controls fire extinguishing unit heats fire suppression bottle, makes the pot temperature average out to 55 DEG C-60 DEG C of fire suppression bottle.
(12), when transformer internal pressure is greater than 50kpa, control unit controls cut-off valve and closes, and pressure relief valve is opened, and transformer oil or the pipeline of gas through being connected with pressure relief valve are discharged to the exhaust ports of pressure relief unit;
(13), when transformer internal pressure is greater than 55kpa, oil pressure makes the safety valve on the oil exit pipe of transformer top open, unidirectional valve on oil exit pipe is discharged, when the pressure in oil exit pipe is greater than 60kpa, control unit controls oil drain pump and opens, pressure in oil exit pipe is reduced to below 58kpa, accelerates the release of transformer internal pressure;
(14), when transformer internal pressure is greater than 61kpa, the electromagnetically operated valve be connected with oil extraction case in the middle part of controller control transformer is opened, and is transferred to by transformer oil in oil extraction case;
(15), when transformer internal pressure is greater than 70kpa, the electromagnetically operated valve that controller control transformer bottom is connected with oil extraction case is opened;
(16), when the pressure in oil extraction case is greater than 55kpa, the safety valve of oil extraction case lower end is opened;
(17), when transformer internal pressure is reduced to 55kpa make, the closed electromagnetic valve of the pipeline that control unit control transformer is connected with oil extraction case;
(18), exhaust ports detects air-flow, control unit control igniter fire;
(19), control unit detect the transformer oil in oil extraction case more than its capacity three people for the moment, control self-fractionating pump and start;
(20), self-fractionating pump extracts transformer oil in oil extraction case after filtration after net filtration, and enter clarifier, transformer oil filters by the filter core in clarifier and nonwoven layer;
(21), enter magnetic separator from the transformer oil of clarifier output, the active carbon layer in magnetic separator, filters again by transformer oil; The electromagnetic field of 820T-910T is provided with in magnetic separator;
(22), the transformer oil of magnetic separator input flows in oil extraction case after self-fractionating pump.
Due to said method, adopt mixed type fire-suppressant gas, single fire-suppressant gas can be avoided to cause unnecessary loss because of himself defect, ensure Supply Security to greatest extent.The method is to connection blender simultaneously, and carry out pressurising with the pipeline in blender, the failure rate of these equipment can be reduced, utilize the non-oxidizability improving its fire extinguishing unit relevant device, the fail safe of antiknock device can be ensured, the proper proportion of its gas effectively can improve explosion-proof capabilities equally, the generation of second accident directly can be avoided to the method for short dot cooling, reduce the influence degree of its short circuit, other equipment of surrounding can be protected, reduce loss, fire suppression bottle is heated, be conducive to the Quick-gasifying of fire-suppressant gas in tank, improve its explosion-proof efficiency and reduce reflecting time.Can effectively by earth pressure release, explosion-proof safety and stability can be improved, the increase row pressure channel suitable according to the transformation of transformer internal pressure, avoid because transformer oil pressure exceedes the upper limit of single delivery mode, and cause damage, on the other hand, to the pleasantly surprised process of transformer oil after discharge, its methane gas produced, such as: the imflammable gas such as hydrogen, acetylene, methane, be transferred to the burning of safe place, avoid because of these that imflammable gas density is too high causes blast, and the safety of the harm person or equipment.Avoid waste, avoid the pollution of transformer oil to environment simultaneously, improve the feature of environmental protection, avoid transformer oil on the impact of human body, and transformer oil remains the impact on soil, re-use after transformer oil can being cleaned, reduce the cost that transformer comes into operation again.Another is convenient, said method adopts and first inflates the mode bled off pressure again, pressure when can avoid Transformer Winding temperature more than 85 DEG C explodes the impact of stage to transformer shell, at the very start transformer boost is opened to safety valve, when avoiding pressure to explode, safety valve can not open the impact to equipment in time.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, can make effectively to prevent Explosion of Transformer, the protection person and the safety of property, this structure to all can monitor everywhere on winding, and when short circuit, timely early warning and complete explosion-proof action.
2, can lower the temperature for the position of short circuit by emphasis, evenly spray fire-suppressant gas at transformer top simultaneously, strengthen explosion-proof means, can bleed off pressure transformer in time, while can avoid the waste of transformer oil.Its each transducer adopts special material to make to have stronger, sensitivity, can the misoperation of effective anti-locking apparatus or false alarm.
3, its explosion protection system simplicity of design, can be good make the raising explosion-proof performance that cooperatively interacts between unit, prevent the generation of second accident.Avoid the waste of transformer oil simultaneously, in time transformer oil shifted and lower the temperature, purify.The security reliability of explosion-proof fire-extinguishing system is effectively provided.
4, can recycle transformer oil, avoid waste, cost-saving, avoid environmental pollution simultaneously.
5, the mode bled off pressure again is first inflated in employing, can avoid pressure and explode the stage to the impact set.
Accompanying drawing explanation
Fig. 1 is 75MVA transformer device structure figure explosion-proof in the present invention;
Mark in figure: 1-transformer, 2-conservator, 3-fire suppression mechanism, 4-pressure release mechanism, 5-purification mechanism.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
specific embodiment 1:
As shown in Figure 1,
A kind of explosion-proof 75MVA transformer of the present invention, comprises the fire suppression mechanism 3 be connected on transformer 1, pressure release mechanism 4, leakage detecting device and controlling organization;
Transformer 1, comprises housing, conservator 2, iron core, winding; Conservator 2 is located at housing upper end, and is connected by pipeline with housing, and this pipeline is provided with Buchholz relay and cut-off valve; The winding of three-phase is located in housing, in winding, be enclosed with iron core, respectively arranges a temperature sensor in upper, middle and lower three positions of the winding of three-phase; A pressure sensor is set respectively in the upper, middle and lower of housing;
Fire suppression mechanism 3, comprises fire extinguishing box, fire suppression bottle, gas boosting pump; Fire suppression bottle is arranged in fire extinguishing box, and on the top of hull outside and the winding of three-phase, the relative position in middle part, bottom is connected to electromagnetically operated valve; The electromagnetically operated valve of bottom and the electromagnetically operated valve at middle part are connected on the electromagnetically operated valve of fire suppression bottle respectively by pipeline; The electromagnetically operated valve on top connects gas boosting pump by pipeline, and this gas boosting pump is arranged on the top of fire extinguishing box, and gas boosting pump is connected with the electromagnetically operated valve of fire suppression bottle; Pressure sensor is provided with for detecting the pressure of this electromagnetically operated valve place fire-suppressant gas at the electromagnetically operated valve place be connected with housing; Fire suppression bottle is provided with heater;
Pressure release mechanism 4, comprises oil extraction case, oil extraction pond, oil drain pump, igniter; The below of transformer 1 is located at by oil extraction case, is connected with an electromagnetically operated valve respectively at the middle part of the housing of transformer 1 and lower outside, and is connected in oil extraction case by this valve with electrically motorized operation; Be provided with oil drain out at oil extraction lower box part, this oil drain out place is provided with safety valve; Safety valve is connected with outside the housing upper of transformer 1, this safety valve is communicated in oil extraction pond by upper oil exit pipe, oil extraction is provided with water film in pond, the outlet of upper oil exit pipe is arranged in water layer, oil drain pump is arranged on on oil exit pipe for oil extraction, upper oil exit pipe through fire extinguishing box, and is provided with heat exchanger between upper oil exit pipe and fire suppression bottle; Be connected with exhaust outlet on the top in oil extraction pond by pipeline, this exhaust outlet be located at away from transformer 1 at least 12m position and this exhaust ports is provided with igniter; Case top is provided with pressure relief valve, and this pressure relief valve is connected to exhaust outlet by pipeline
Leakage detecting device, comprises heat insulation loop, and heat insulation loop is set in pressure release mechanism 4, junction between fire suppression mechanism 3 and transformer 1 three or between its inner each parts, has temperature sensor in the arranged outside of heat insulation loop; Temperature sensor in heat insulation loop is used for collecting in controller, and controller can according to the temperature averages of the temperature sensor collection outside its all temperature heat insulation loop and temperature be the highest or minimum, judges that this peak or minimum place have leak point.
Controlling organization, comprises controller, communicator; Be located at leakage detecting device, pressure release mechanism 4, fire suppression mechanism 3 or transformer 1 to be connected by cable with controller, communicator is connected by cable with controller, and communicator is connected with external network by optical fiber.
Housing internal upper part is provided with nozzle mechanism, this nozzle mechanism is connected with the electromagnetically operated valve of housing upper, nozzle mechanism comprises spray seat, shower nozzle and connector, shower nozzle is connected by connector with spray seat, there is in shower nozzle the booster cavity of taper, shower nozzle adopts atomizer, and connector is active connection, and this connector makes shower nozzle reciprocating motion thus evenly sprays.
Oil extraction case is connected with purification mechanism 5, and this purification mechanism 5 comprises self-fractionating pump, clarifier and magnetic separator.
Be provided with fuel level sensor, temperature sensor, pressure sensor in oil extraction case, the tank wall lateral wall of oil extraction case is provided with radiator, and row's tank bottoms is provided with magnet strip.
The two ends of oil drain pump are parallel with unidirectional valve.
Fire suppression bottle comprises helium tank, nitrogen pot, heptafluoro-propane tank, arranges gas and vapor permeation mechanism on the top of fire suppression bottle.
Current-carrying part in pressure sensor, temperature sensor or fuel level sensor is made up of grapheme material.
Due to said mechanism; can make effectively to prevent transformer 1 from exploding; the protection person and the safety of property, this structure to all can monitor everywhere on winding, and when short circuit; timely early warning and complete explosion-proof action; can lower the temperature for the position of short circuit by emphasis, evenly spray fire-suppressant gas at transformer 1 top simultaneously, strengthen explosion-proof means; can bleed off pressure transformer 1 in time, the waste of transformer 1 oil can be avoided simultaneously.Its each transducer adopts special material to make to have stronger, sensitivity, can the misoperation of effective anti-locking apparatus or false alarm.
specific embodiment 2:
According to the transformer of specific embodiment 1, the explosion protection system of this transformer, comprising:
Control unit;
Transformer 1 unit, comprises housing, conservator 2, iron core, winding; Conservator 2 is fixed on case top and is communicated in housing by Buchholz relay and cut-off valve; The winding of three-phase is located in housing, is enclosed with iron core in each winding, respectively arranges a temperature sensor in upper, middle and lower three positions of each winding; A pressure sensor is set respectively in the upper, middle and lower of housing, for detecting oil temperature in housing or methane gas temperature; The below of transformer 1 is provided with basement;
Pressure relief unit, comprises oil extraction case, oil extraction pond, oil drain pump, igniter, pressure relief valve; Oil extraction case is located in the basement of the below of transformer 1, and at the middle part of the housing of transformer 1 and lower outside homogeneous electromagnetically operated valve, two electromagnetically operated valves are also connected with oil extraction case after connecting; Be provided with oil drain out at oil extraction lower box part, oil drain out is provided with the safety valve that rated pressure is 55kpa; Being connected with a rated pressure outside the housing upper of transformer 1 is 52kpa safety valve, this safety valve is switched in oil extraction pond by upper oil exit pipe, the water film that thickness is 10-20cm is provided with in oil extraction pond, the outlet of upper oil exit pipe is arranged in water film, oil drain pump is arranged on extraction speed oil exit pipe being accelerated its oil and is convenient to oil extraction, and upper oil exit pipe is through the middle part of fire extinguishing box; Be parallel with a Unidirectional solenoid valve in the both sides of oil drain pump, the pipeline being 5-8cm by caliber above oil extraction pond is connected with exhaust outlet, and this exhaust outlet away from transformer 1 at least 12m, and is provided with igniter in this exhaust ports; Igniter is by being connected with control unit; The rated pressure of pressure relief valve is 45kpa-50kpa, this pressure relief valve by pipeline communication to exhaust outlet;
Gas mixing units, comprise blender, electromagnetically operated valve, fire suppression bottle, fire suppression bottle comprises helium tank, nitrogen pot, heptafluoro-propane tank, fire suppression bottle exit is connected with Pressure gauge, pressure sensor, rated pressure are 70kpa electromagnetically operated valve, initial pressure in blender is 100 ± 10%kpa, is provided with hybrid chamber in blender, and hybrid chamber is provided with pressure sensor, the exit of blender is provided with electromagnetically operated valve, and hybrid chamber is connected with the electromagnetically operated valve on fire suppression bottle;
Fire extinguishing unit, comprise gas boosting pump, nozzle mechanism, heater and heat exchanger, nozzle mechanism comprises shower nozzle and spray seat, and spray seat is connected by active connection with shower nozzle; Heat exchanger is arranged between oil exit pipe and fire suppression bottle for heat exchange; Heater is arranged on fire suppression bottle, and fire suppression bottle is connected with pressure sensor; On the top of hull outside and the winding of three-phase, the relative position in middle part, bottom connects an electromagnetically operated valve respectively; The electromagnetically operated valve of bottom is connected with blender with after the electromagnetically operated valve parallel connection at middle part; The electromagnetically operated valve on top connects gas boosting pump by pipeline, and the electromagnetically operated valve on top is connected on the nozzle mechanism of transformer 1 inside simultaneously, and this gas boosting pump is connected with blender; Pressure sensor is provided with for detecting the pressure of this electromagnetically operated valve place fire-suppressant gas at the electromagnetically operated valve place be connected with housing; Fire suppression bottle is provided with heater;
Leak detection unit, comprise heat insulation loop, heat insulation loop ring set, in the junction of pipeline, is outside equipped with temperature sensor at thermal insulation layer, and each temperature sensor is connected with control unit;
Clean unit, comprises self-fractionating pump, clarifier and magnetic separator; The oil drain out place pipe side wall of oil extraction case is connected with clarifier, 50-80 object screen pack is set in the porch of clarifier, in clarifier, be provided with the filtration core of accordion, filtration core adopts the polypropylene of 2-3mm to be that material is made, and is also arranged with thickness 1-1.2mm nonwoven layer outward at filtration core; Be connected with magnetic separator in the exit of clarifier, be provided with magnetic board in the both sides of magnetic separator, between magnetic board, there is parallel magnetic field, be provided with 80-100 object ceramic network in the inside of magnetic separator and thickness is the active carbon net of 3-3.5mm; Be connected with self-fractionating pump in the outlet of magnetic separator, self-fractionating pump is connected to oil extraction box top, and the lateral wall of oil extraction case is provided with radiator, and row's tank bottoms is provided with magnet strip;
Control unit and clean unit, unit of hunting leak, put out a fire unit, pressure relief unit and transformer 1 unit be connected, for gathering the signal of unit and controlling the action of unit and the action that cooperatively interacts, unit the current-carrying part of temperature sensor, pressure sensor or fuel level sensor that uses be made up of Graphene.
Due to said system, can by unified for explosion protection system regulation and control, make the cooperation that unit is good, the more effective raising explosion-proof of the system between unit can be made, the accident that each pressure sensor causes when can reduce signal wrong report, improve explosion-proof effect safely and effectively, the pressure of transformer 1 inside can be reduced to greatest extent, so that prevent the generation of second accident.Avoid the waste of transformer 1 oil simultaneously, in time transformer 1 oil shifted and lower the temperature, purify.The security reliability of explosion-proof fire-extinguishing system is effectively provided.
specific embodiment 3:
According to the explosion protection system of specific embodiment 2, the explosion-proof method of this explosion protection system:
(1) initial pressure, in its helium tank, nitrogen pot, heptafluoro-propane tank is for being respectively 8 ± 10%MPa, 10 ± 10%MPa, 6.5 ± 10%kpa;
(2), first control unit is opened electromagnetically operated valve above helium tank and note helium in blender, to the air pressure in blender to 20-22kpa, then helium tank electromagnetically operated valve is closed, and controlling nitrogen pot, to note air pressure in nitrogen to blender in blender be 50-53kpa, then nitrogen pot is closed, and control heptafluoro-propane tank open be air pressure in blender to 60-65kpa, then close heptafluoro-propane tank;
(3), by the electromagnetically operated valve at mixer outlet place open, close this electromagnetically operated valve after rising to 15-18kpa atmospherically in the pipeline that blender is connected with transformer 1, the air pressure now in blender drops to 30-35kpa;
(4), control unit to open or close in helium tank, heptafluoro-propane tank and nitrogen pot to blender air pressure successively to 80kpa, and to make in blender content than helium: heptafluoro-propane: nitrogen=(8.5-9.4): (4.6-5.3): (11.3-15.2); Then continuing to open or close air pressure in helium tank, heptafluoro-propane tank and nitrogen pot to blender successively according to this ratio is 100 ± 10%kpa;
(5), when the Pressure Drop in helium tank, nitrogen pot, heptafluoro-propane is to the 15%-20% of its initial pressure, should supplement in time;
(6), controller according to the position of temperature sensor winding recording maximum temperature value, judge short dot position; After the electromagnetically operated valve at mixer outlet place is opened, control unit is according to the position of short dot, and the electromagnetically operated valve of the fire extinguishing unit that this short dot of command range is nearest opens to lower the temperature to short dot;
(7), control unit is when recording transformer 1 internal short-circuit point temperature higher than 55 DEG C, and control unit sends alarm signal; During higher than 65 DEG C, Buchholz relay detects methane gas simultaneously, and control unit sends light gas alarming signal; During higher than 85 DEG C, Buchholz relay detects the change of oil stream simultaneously, and control unit sends grave gas signal, simultaneously the input power-off of control unit control transformer 1; When temperature is higher than 95 degrees Celsius, the electromagnetically operated valve of fire extinguishing unit is opened;
(8) after the pressure, in blender reduces, controller controls helium tank, the electromagnetically operated valve on nitrogen pot and heptafluoro-propane tank top partially opens, and with helium: heptafluoro-propane: the ratio of nitrogen=9:4.8:12 enters in blender and is combined into mist is that the air pressure in blender is not less than 95kpa;
(9) when the mean temperature, in transformer 1 is higher than 85 degrees Celsius, control unit controls to open with the electromagnetically operated valve on fire extinguishing unit top, control booster pump to open simultaneously, mist is pressurized to more than 250kpa by booster pump, and sprayed by the nozzle on transformer 1 top, nozzle reciprocating motion, sprays mist uniformly;
(10), the heat exchanger of fire extinguishing unit absorbs the heat of transformer oil of discharging, and heats fire suppression bottle, the pressure of fire suppression bottle raised, is convenient to the helium in fire suppression bottle, heptafluoro-propane or nitrogen and gasifies;
(11), when the air pressure in helium, heptafluoro-propane or nitrogen is lower than 3.3MPa, the heater that controller controls fire extinguishing unit heats fire suppression bottle, makes the pot temperature average out to 55 DEG C-60 DEG C of fire suppression bottle.
(12), when transformer 1 internal pressure is greater than 50kpa, control unit controls cut-off valve and closes, and pressure relief valve is opened, and transformer 1 oil or the pipeline of gas through being connected with pressure relief valve are discharged to the exhaust ports of pressure relief unit;
(13), when transformer 1 internal pressure is greater than 55kpa, oil pressure makes the safety valve on the oil exit pipe of transformer 1 top open, unidirectional valve on oil exit pipe is discharged, when the pressure in oil exit pipe is greater than 60kpa, control unit controls oil drain pump and opens, pressure in oil exit pipe is reduced to below 58kpa, accelerates the release of transformer 1 internal pressure;
(14), when transformer 1 internal pressure is greater than 61kpa, the electromagnetically operated valve be connected with oil extraction case in the middle part of controller control transformer 1 is opened, and is transferred in oil extraction case by transformer 1 oil;
(15), when transformer 1 internal pressure is greater than 70kpa, the electromagnetically operated valve that controller control transformer 1 bottom is connected with oil extraction case is opened;
(16), when the pressure in oil extraction case is greater than 55kpa, the safety valve of oil extraction case lower end is opened;
(17), when transformer 1 internal pressure is reduced to 55kpa make, the closed electromagnetic valve of the pipeline that control unit control transformer 1 is connected with oil extraction case;
(18), exhaust ports detects air-flow, control unit control igniter fire;
(19), control unit detect transformer 1 oil in oil extraction case more than its capacity three people for the moment, control self-fractionating pump and start;
(20), self-fractionating pump extracts transformer 1 oil in oil extraction case after filtration after net filtration, and enter clarifier, transformer 1 oil filters by the filter core in clarifier and nonwoven layer;
(21), enter magnetic separator from transformer 1 oil of clarifier output, the active carbon layer in magnetic separator, filters again by transformer 1 oil; The electromagnetic field of 820T-910T is provided with in magnetic separator;
(22), transformer 1 oil of magnetic separator input flows in oil extraction case after self-fractionating pump.
Due to said method, adopt mixed type fire-suppressant gas, single fire-suppressant gas can be avoided to cause unnecessary loss because of himself defect, ensure Supply Security to greatest extent.The method is to connection blender simultaneously, and carry out pressurising with the pipeline in blender, the failure rate of these equipment can be reduced, utilize the non-oxidizability improving its fire extinguishing unit relevant device, the fail safe of antiknock device can be ensured, the proper proportion of its gas effectively can improve explosion-proof capabilities equally, the generation of second accident directly can be avoided to the method for short dot cooling, reduce the influence degree of its short circuit, other equipment of surrounding can be protected, reduce loss, fire suppression bottle is heated, be conducive to the Quick-gasifying of fire-suppressant gas in tank, improve its explosion-proof efficiency and reduce reflecting time.Can effectively by earth pressure release, explosion-proof safety and stability can be improved, the increase row pressure channel suitable according to the transformation of transformer 1 internal pressure, avoid because transformer 1 oil pressure exceedes the upper limit of single delivery mode, and cause damage, on the other hand, to the oily pleasantly surprised process of transformer 1 after discharge, its methane gas produced, such as: the imflammable gas such as hydrogen, acetylene, methane, be transferred to the burning of safe place, avoid because of these that imflammable gas density is too high causes blast, and the safety of the harm person or equipment.Avoid waste, avoid transformer 1 oil to the pollution of environment simultaneously, improve the feature of environmental protection, avoid transformer 1 oil on the impact of human body, and the residual impact on soil of transformer 1 oil, can re-use after clean for transformer 1 oil, reduce the cost that transformer 1 comes into operation again.Another is convenient, said method adopts and first inflates the mode bled off pressure again, pressure when can avoid transformer 1 winding temperature more than 85 DEG C explodes the impact of stage to the housing of transformer 1, boost to safety valve to transformer 1 at the very start to open, when avoiding pressure to explode, safety valve can not open the impact to equipment in time.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, can make effectively to prevent transformer 1 from exploding, the protection person and the safety of property, this structure to all can monitor everywhere on winding, and when short circuit, timely early warning and complete explosion-proof action.
2, can lower the temperature for the position of short circuit by emphasis, evenly spray fire-suppressant gas at transformer 1 top simultaneously, strengthen explosion-proof means, can bleed off pressure transformer 1 in time, while can avoid the waste of transformer 1 oil.Its each transducer adopts special material to make to have stronger, sensitivity, can the misoperation of effective anti-locking apparatus or false alarm.
3, its explosion protection system simplicity of design, can be good make the raising explosion-proof performance that cooperatively interacts between unit, prevent the generation of second accident.Avoid the waste of transformer 1 oil simultaneously, in time transformer 1 oil shifted and lower the temperature, purify.The security reliability of explosion-proof fire-extinguishing system is effectively provided.
4, can recycle transformer 1 oil, avoid waste, cost-saving, avoid environmental pollution simultaneously.
5, the mode bled off pressure again is first inflated in employing, can avoid pressure and explode the stage to the impact set.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an explosion-proof 75MVA transformer, is characterized in that, comprises the fire suppression mechanism be connected on transformer, pressure release mechanism, leakage detecting device and controlling organization;
Described transformer, comprises housing, conservator, iron core, winding; Conservator is located at housing upper end, and is connected by pipeline with housing, and this pipeline is provided with Buchholz relay and cut-off valve; The winding of three-phase is located in housing, in winding, be enclosed with iron core, respectively arranges a temperature sensor in upper, middle and lower three positions of the winding of three-phase; A pressure sensor is set respectively in the upper, middle and lower of housing;
Described fire suppression mechanism, comprises fire extinguishing box, fire suppression bottle, gas boosting pump; Fire suppression bottle is arranged in fire extinguishing box, and on the top of hull outside and the winding of three-phase, the relative position in middle part, bottom is connected to electromagnetically operated valve; The electromagnetically operated valve of bottom and the electromagnetically operated valve at middle part are connected on the electromagnetically operated valve of fire suppression bottle respectively by pipeline; The electromagnetically operated valve on top connects gas boosting pump by pipeline, and this gas boosting pump is arranged on the top of fire extinguishing box, and gas boosting pump is connected with the electromagnetically operated valve of fire suppression bottle; Pressure sensor is provided with for detecting the pressure of this electromagnetically operated valve place fire-suppressant gas at the electromagnetically operated valve place be connected with housing; Fire suppression bottle is provided with heater;
Described pressure release mechanism, comprises oil extraction case, oil extraction pond, oil drain pump, igniter; The below of transformer is located at by oil extraction case, is connected with an electromagnetically operated valve respectively at the middle part of transformer shell and lower outside, and is connected in oil extraction case by this valve with electrically motorized operation; Be provided with oil drain out at oil extraction lower box part, this oil drain out place is provided with safety valve; Safety valve is connected with outside the housing upper of transformer, this safety valve is communicated in oil extraction pond by upper oil exit pipe, oil extraction is provided with water film in pond, the outlet of upper oil exit pipe is arranged in water layer, oil drain pump is arranged on on oil exit pipe for oil extraction, upper oil exit pipe through fire extinguishing box, and is provided with heat exchanger between upper oil exit pipe and fire suppression bottle; Be connected with exhaust outlet on the top in oil extraction pond by pipeline, this exhaust outlet be located at away from transformer at least 12m position and this exhaust ports is provided with igniter; Case top is provided with pressure relief valve, and this pressure relief valve is connected to exhaust outlet by pipeline
Described leakage detecting device, comprises heat insulation loop, and heat insulation loop is set in pressure release mechanism, junction between fire suppression mechanism and transformer three or between its inner each parts, has temperature sensor in the arranged outside of heat insulation loop;
Described controlling organization, comprises controller, communicator; Be located at leakage detecting device, pressure release mechanism, fire suppression mechanism or transformer to be connected by cable with controller, communicator is connected by cable with controller, and communicator is connected with external network by optical fiber.
2. explosion-proof 75MVA transformer according to claim 1, it is characterized in that, described housing internal upper part is provided with nozzle mechanism, this nozzle mechanism is connected with the electromagnetically operated valve of housing upper, and nozzle mechanism comprises spray seat, shower nozzle and connector, and shower nozzle is connected by connector with spray seat, there is in shower nozzle the booster cavity of taper, shower nozzle adopts atomizer, and connector is active connection, and this connector makes shower nozzle reciprocating motion thus evenly sprays.
3. explosion-proof 75MVA transformer according to claim 2, is characterized in that, described oil extraction case is connected with purification mechanism, and this purification mechanism comprises self-fractionating pump, clarifier and magnetic separator.
4. explosion-proof 75MVA transformer according to claim 3, is characterized in that, is provided with fuel level sensor, temperature sensor, pressure sensor in described oil extraction case, and the tank wall lateral wall of oil extraction case is provided with radiator, and row's tank bottoms is provided with magnet strip.
5. explosion-proof 75MVA transformer according to claim 4, it is characterized in that, the two ends of described oil drain pump are parallel with unidirectional valve.
6. explosion-proof 75MVA transformer according to claim 5, is characterized in that, described fire suppression bottle comprises helium tank, nitrogen pot, heptafluoro-propane tank, arranges gas and vapor permeation mechanism on the top of fire suppression bottle.
7. explosion-proof 75MVA transformer according to claim 6, it is characterized in that, the current-carrying part in described pressure sensor, temperature sensor or fuel level sensor is made up of grapheme material.
8. the explosion-proof 75MVA transformer according to any one of claim 1-7, it is characterized in that, the explosion protection system of this transformer, comprising:
Control unit;
Transformer unit, comprises housing, conservator, iron core, winding; Conservator is fixed on case top and is communicated in housing by Buchholz relay and cut-off valve; The winding of three-phase is located in housing, is enclosed with iron core in each winding, respectively arranges a temperature sensor in upper, middle and lower three positions of each winding; A pressure sensor is set respectively in the upper, middle and lower of housing, for detecting oil temperature in housing or methane gas temperature; The below of transformer is provided with basement;
Pressure relief unit, comprises oil extraction case, oil extraction pond, oil drain pump, igniter, pressure relief valve; Oil extraction case is located in the basement of the below of transformer, and at the middle part of transformer shell and lower outside homogeneous electromagnetically operated valve, two electromagnetically operated valves are also connected with oil extraction case after connecting; Be provided with oil drain out at oil extraction lower box part, oil drain out is provided with the safety valve that rated pressure is 55kpa; Being connected with a rated pressure outside the housing upper of transformer is 52kpa safety valve, this safety valve is switched in oil extraction pond by upper oil exit pipe, the water film that thickness is 10-20cm is provided with in oil extraction pond, the outlet of upper oil exit pipe is arranged in water film, oil drain pump is arranged on extraction speed oil exit pipe being accelerated its oil and is convenient to oil extraction, and upper oil exit pipe is through the middle part of fire extinguishing box; Be parallel with a Unidirectional solenoid valve in the both sides of oil drain pump, the pipeline being 5-8cm by caliber above oil extraction pond is connected with exhaust outlet, and this exhaust outlet away from transformer at least 12m, and is provided with igniter in this exhaust ports; Igniter is by being connected with control unit; The rated pressure of pressure relief valve is 45kpa-50kpa, this pressure relief valve by pipeline communication to exhaust outlet;
Gas mixing units, comprise blender, electromagnetically operated valve, fire suppression bottle, fire suppression bottle comprises helium tank, nitrogen pot, heptafluoro-propane tank, fire suppression bottle exit is connected with Pressure gauge, pressure sensor, rated pressure are 70kpa electromagnetically operated valve, initial pressure in blender is 100 ± 10%kpa, is provided with hybrid chamber in blender, and hybrid chamber is provided with pressure sensor, the exit of blender is provided with electromagnetically operated valve, and hybrid chamber is connected with the electromagnetically operated valve on fire suppression bottle;
Fire extinguishing unit, comprise gas boosting pump, nozzle mechanism, heater and heat exchanger, nozzle mechanism comprises shower nozzle and spray seat, and spray seat is connected by active connection with shower nozzle; Heat exchanger is arranged between oil exit pipe and fire suppression bottle for heat exchange; Heater is arranged on fire suppression bottle, and fire suppression bottle is connected with pressure sensor; On the top of hull outside and the winding of three-phase, the relative position in middle part, bottom connects an electromagnetically operated valve respectively; The electromagnetically operated valve of bottom is connected with blender with after the electromagnetically operated valve parallel connection at middle part; The electromagnetically operated valve on top connects gas boosting pump by pipeline, and the electromagnetically operated valve on top is connected on the nozzle mechanism of inside transformer simultaneously, and this gas boosting pump is connected with blender; Pressure sensor is provided with for detecting the pressure of this electromagnetically operated valve place fire-suppressant gas at the electromagnetically operated valve place be connected with housing; Fire suppression bottle is provided with heater;
Leak detection unit, comprise heat insulation loop, heat insulation loop ring set, in the junction of pipeline, is outside equipped with temperature sensor at thermal insulation layer, and each temperature sensor is connected with control unit;
Clean unit, comprises self-fractionating pump, clarifier and magnetic separator; The oil drain out place pipe side wall of oil extraction case is connected with clarifier, 50-80 object screen pack is set in the porch of clarifier, in clarifier, be provided with the filtration core of accordion, filtration core adopts the polypropylene of 2-3mm to be that material is made, and is also arranged with thickness 1-1.2mm nonwoven layer outward at filtration core; Be connected with magnetic separator in the exit of clarifier, be provided with magnetic board in the both sides of magnetic separator, between magnetic board, there is parallel magnetic field, be provided with 80-100 object ceramic network in the inside of magnetic separator and thickness is the active carbon net of 3-3.5mm; Be connected with self-fractionating pump in the outlet of magnetic separator, self-fractionating pump is connected to oil extraction box top, and the lateral wall of oil extraction case is provided with radiator, and row's tank bottoms is provided with magnet strip;
Control unit is connected with clean unit, unit of hunting leak, put out a fire unit, pressure relief unit and transformer unit, for gathering the signal of unit and controlling the action of unit and the action that cooperatively interacts, unit the current-carrying part of temperature sensor, pressure sensor or fuel level sensor that uses be made up of Graphene.
9. explosion-proof 75MVA transformer according to claim 8, is characterized in that, the explosion-proof method of this explosion protection system:
(1) initial pressure, in its helium tank, nitrogen pot, heptafluoro-propane tank is for being respectively 8 ± 10%MPa, 10 ± 10%MPa, 6.5 ± 10%kpa;
(2), first control unit is opened electromagnetically operated valve above helium tank and note helium in blender, to the air pressure in blender to 20-22kpa, then helium tank electromagnetically operated valve is closed, and controlling nitrogen pot, to note air pressure in nitrogen to blender in blender be 50-53kpa, then nitrogen pot is closed, and control heptafluoro-propane tank open be air pressure in blender to 60-65kpa, then close heptafluoro-propane tank;
(3), by the electromagnetically operated valve at mixer outlet place open, close this electromagnetically operated valve after rising to 15-18kpa atmospherically in the pipeline that blender is connected with transformer, the air pressure now in blender drops to 30-35kpa;
(4), control unit to open or close in helium tank, heptafluoro-propane tank and nitrogen pot to blender air pressure successively to 80kpa, and to make in blender content than helium: heptafluoro-propane: nitrogen=(8.5-9.4): (4.6-5.3): (11.3-15.2); Then continuing to open or close air pressure in helium tank, heptafluoro-propane tank and nitrogen pot to blender successively according to this ratio is 100 ± 10%kpa;
(5), when the Pressure Drop in helium tank, nitrogen pot, heptafluoro-propane is to the 15%-20% of its initial pressure, should supplement in time;
(6), controller according to the position of temperature sensor winding recording maximum temperature value, judge short dot position; After the electromagnetically operated valve at mixer outlet place is opened, control unit is according to the position of short dot, and the electromagnetically operated valve of the fire extinguishing unit that this short dot of command range is nearest opens to lower the temperature to short dot;
(7), control unit is when recording transformer internal short-circuit point temperature higher than 55 DEG C, and control unit sends alarm signal; During higher than 65 DEG C, Buchholz relay detects methane gas simultaneously, and control unit sends light gas alarming signal; During higher than 85 DEG C, Buchholz relay detects the change of oil stream simultaneously, and control unit sends grave gas signal, simultaneously the input power-off of control unit control transformer; When temperature is higher than 95 degrees Celsius, the electromagnetically operated valve of fire extinguishing unit is opened;
(8) after the pressure, in blender reduces, controller controls helium tank, the electromagnetically operated valve on nitrogen pot and heptafluoro-propane tank top partially opens, and with helium: heptafluoro-propane: the ratio of nitrogen=9:4.8:12 enters in blender and is combined into mist is that the air pressure in blender is not less than 95kpa;
(9) when the mean temperature, in transformer is higher than 85 degrees Celsius, control unit controls to open with the electromagnetically operated valve on fire extinguishing unit top, control booster pump to open simultaneously, mist is pressurized to more than 250kpa by booster pump, and sprayed by the nozzle on transformer top, nozzle reciprocating motion, sprays mist uniformly;
(10), the heat exchanger of fire extinguishing unit absorbs the heat of transformer oil of discharging, and heats fire suppression bottle, the pressure of fire suppression bottle raised, is convenient to the helium in fire suppression bottle, heptafluoro-propane or nitrogen and gasifies;
(11), when the air pressure in helium, heptafluoro-propane or nitrogen is lower than 3.3MPa, the heater that controller controls fire extinguishing unit heats fire suppression bottle, makes the pot temperature average out to 55 DEG C-60 DEG C of fire suppression bottle;
(12), when transformer internal pressure is greater than 50kpa, control unit controls cut-off valve and closes, and pressure relief valve is opened, and transformer oil or the pipeline of gas through being connected with pressure relief valve are discharged to the exhaust ports of pressure relief unit;
(13), when transformer internal pressure is greater than 55kpa, oil pressure makes the safety valve on the oil exit pipe of transformer top open, unidirectional valve on oil exit pipe is discharged, when the pressure in oil exit pipe is greater than 60kpa, control unit controls oil drain pump and opens, pressure in oil exit pipe is reduced to below 58kpa, accelerates the release of transformer internal pressure;
(14), when transformer internal pressure is greater than 61kpa, the electromagnetically operated valve be connected with oil extraction case in the middle part of controller control transformer is opened, and is transferred to by transformer oil in oil extraction case;
(15), when transformer internal pressure is greater than 70kpa, the electromagnetically operated valve that controller control transformer bottom is connected with oil extraction case is opened;
(16), when the pressure in oil extraction case is greater than 55kpa, the safety valve of oil extraction case lower end is opened;
(17), when transformer internal pressure is reduced to 55kpa make, the closed electromagnetic valve of the pipeline that control unit control transformer is connected with oil extraction case;
(18), exhaust ports detects air-flow, control unit control igniter fire;
(19), control unit detect the transformer oil in oil extraction case more than its capacity three people for the moment, control self-fractionating pump and start;
(20), self-fractionating pump extracts transformer oil in oil extraction case after filtration after net filtration, and enter clarifier, transformer oil filters by the filter core in clarifier and nonwoven layer;
(21), enter magnetic separator from the transformer oil of clarifier output, the active carbon layer in magnetic separator, filters again by transformer oil; The electromagnetic field of 820T-910T is provided with in magnetic separator;
(22), the transformer oil of magnetic separator input flows in oil extraction case after self-fractionating pump.
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| CN106158270A (en) * | 2016-08-29 | 2016-11-23 | 中车大连机车车辆有限公司 | Electric locomotive oil immersed type traction trans former gas shield controls device and control method thereof |
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| CN202564023U (en) * | 2012-04-17 | 2012-11-28 | 郑州赛奥电子股份有限公司 | On-line oil filtering system of oil-immersed transformer |
| CN203842216U (en) * | 2014-04-18 | 2014-09-24 | 常州市盈能电气有限公司 | Anti-explosion fire extinguishing device of transformer |
| CN104436477A (en) * | 2014-12-01 | 2015-03-25 | 国家电网公司 | Comprehensive fire fighting system and comprehensive fire fighting method of large-size oil-containing equipment of transformer substation |
| CN204447042U (en) * | 2015-01-28 | 2015-07-08 | 保定博为世能电气有限公司 | A kind of transformer and on-load voltage regulating switch one oil-drainage nitrogen-filling fire-extinguishing |
| CN104722225A (en) * | 2015-03-18 | 2015-06-24 | 国家电网公司 | Electrified replenishing device for transformer oil additive |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106158270A (en) * | 2016-08-29 | 2016-11-23 | 中车大连机车车辆有限公司 | Electric locomotive oil immersed type traction trans former gas shield controls device and control method thereof |
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