CN105185542A - Explosion-proof 75MVA transformer system - Google Patents

Explosion-proof 75MVA transformer system Download PDF

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Publication number
CN105185542A
CN105185542A CN201510678450.0A CN201510678450A CN105185542A CN 105185542 A CN105185542 A CN 105185542A CN 201510678450 A CN201510678450 A CN 201510678450A CN 105185542 A CN105185542 A CN 105185542A
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transformer
oil
pressure
blender
electromagnetically operated
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夏烬楚
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Abstract

The invention discloses an explosion-proof 75MVA transformer system which comprises a fire extinguishing mechanism, a pressure releasing mechanism, a leak detecting mechanism and a control mechanism which are connected to a transformer body, wherein the transformer system 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

A kind of explosion-proof 75MVA voltage transformer system
Technical field
The present invention relates to a kind of explosion-proof 75MVA voltage transformer system.
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 voltage transformer system is provided, systematic unity can be regulated and controled, make the cooperation that unit is good, can make the more effective raising explosion-proof of the system between unit, the accident caused when each pressure sensor can reduce signal wrong report, improves 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 1 oil simultaneously, in time transformer oil shifted and lower the temperature, purify.Can the misoperation of effective anti-locking apparatus or false alarm.Systematic unity can be regulated and controled, 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.
The technical solution used in the present invention is as follows:
The invention discloses a kind of explosion-proof 75MVA voltage transformer system, 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, systematic unity can be regulated and controled, 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 gas and vapor permeation method of this 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.
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.Simultaneously the method to connect blender and and blender in pipeline carry out pressurising, 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, avoids the defect of each single fire-suppressant gas simultaneously.
Further, the extinguishing method of this system:
(1), 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;
(2), 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;
(3) 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;
(4) 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;
(5), 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;
(6), 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.
Due to said method; fire-suppressant gas is utilized to lower the temperature to short dot; avoid the too high impact on equipment part fatigue strength of local temperature in transformer; 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.Its utilize discharge transformer oil heat or to heater, fire suppression bottle is heated, is conducive to the Quick-gasifying of fire-suppressant gas in tank, improve its explosion-proof efficiency and reduce reflecting time.
Further, the earth pressure release method of this system:
(1), 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;
(2), 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;
(3), 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;
(4), 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;
(5), when the pressure in oil extraction case is greater than 55kpa, the safety valve of oil extraction case lower end is opened;
(6), 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;
(7), exhaust ports detects air-flow, control unit control igniter fire.
Due to said method, can effectively by earth pressure release, simultaneously, transformer oil in transformer is shifted, cooling, purification, effectively can avoid the generation of second accident, explosion-proof safety and stability can be improved, the increase row pressure channel suitable according to the transformation of transformer internal pressure, the mode being earth pressure release is more various, 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: hydrogen, acetylene, the imflammable gas such as methane, be transferred to safe place burning, avoid because of these that imflammable gas density is too high causes blast, and the safety of the harm person or equipment.
Further, the recovery and purification method of this system:
(1), 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;
(2), 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;
(3), 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;
(4), the transformer oil of magnetic separator input flows in oil extraction case after self-fractionating pump.
The method of above-mentioned reclaiming clean, transformer oil can be recycled, 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.
Further, the explosion-proof method of this 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.
Owing to have employed said structure.
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 system is simple, 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 voltage transformer system structure chart 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,
Explosion-proof 75MVA voltage transformer system of the present invention, 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, systematic unity can be regulated and controled, 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 2:
According to the system of specific embodiment 1, the gas and vapor permeation method of this 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.
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.Simultaneously the method to connect blender and and blender in pipeline carry out pressurising, 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, avoids the defect of each single fire-suppressant gas simultaneously.
specific embodiment 3:
According to the system of specific embodiment 1, the extinguishing method of this system:
(1), 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;
(2), 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;
(3) 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;
(4) 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;
(5), 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;
(6), 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.
Due to said method; fire-suppressant gas is utilized to lower the temperature to short dot; avoid the too high impact on equipment part fatigue strength of local temperature in transformer 1; 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.Its utilize discharge transformer 1 oil heat or to heater, fire suppression bottle is heated, is conducive to the Quick-gasifying of fire-suppressant gas in tank, improve its explosion-proof efficiency and reduce reflecting time.
specific embodiment 4:
According to the system of specific embodiment 1, the earth pressure release method of this system:
(1), 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;
(2), 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;
(3), 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;
(4), 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;
(5), when the pressure in oil extraction case is greater than 55kpa, the safety valve of oil extraction case lower end is opened;
(6), 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;
(7), exhaust ports detects air-flow, control unit control igniter fire.
Due to said method, can effectively by earth pressure release, simultaneously, transformer 1 oil in transformer 1 is shifted, cooling, purification, effectively can avoid the generation of second accident, explosion-proof safety and stability can be improved, the increase row pressure channel suitable according to the transformation of transformer 1 internal pressure, the mode being earth pressure release is more various, 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: hydrogen, acetylene, the imflammable gas such as methane, be transferred to safe place burning, avoid because of these that imflammable gas density is too high causes blast, and the safety of the harm person or equipment.
specific embodiment 5:
According to the system of specific embodiment 1, the recovery and purification method of this system:
(1), 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;
(2), 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;
(3), 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;
(4), transformer 1 oil of magnetic separator input flows in oil extraction case after self-fractionating pump.
The method of above-mentioned reclaiming clean, transformer 1 oil can be recycled, 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.
specific embodiment 6:
According to the system of specific embodiment 1, the explosion-proof method of this 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 system is simple, 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 (6)

1. an explosion-proof 75MVA voltage transformer system, is characterized in that, 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.
2. explosion-proof 75MVA voltage transformer system according to claim 1, is characterized in that, the gas and vapor permeation method of this 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%MPa;
(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.
3. explosion-proof 75MVA voltage transformer system according to claim 1, is characterized in that, the extinguishing method of this system:
(1), 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;
(2), 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;
(3) 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;
(4) 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;
(5), 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;
(6), 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.
4. explosion-proof 75MVA voltage transformer system according to claim 1, is characterized in that, the earth pressure release method of this system:
(1), 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;
(2), 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;
(3), 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;
(4), 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;
(5), when the pressure in oil extraction case is greater than 55kpa, the safety valve of oil extraction case lower end is opened;
(6), 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;
(7), exhaust ports detects air-flow, control unit control igniter fire.
5. explosion-proof 75MVA voltage transformer system according to claim 9, is characterized in that, the recovery and purification method of this system:
(1), 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;
(2), 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;
(3), 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;
(4), the transformer oil of magnetic separator input flows in oil extraction case after self-fractionating pump.
6. explosion-proof 75MVA voltage transformer system according to claim 1, is characterized in that, the explosion-proof method of this 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.
CN201510678450.0A 2015-10-20 2015-10-20 Explosion-proof 75MVA transformer system Pending CN105185542A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108257346A (en) * 2018-01-10 2018-07-06 宁波海蔓汽车科技有限公司 Reactor explosion alarming device
CN109701182A (en) * 2018-12-23 2019-05-03 中国电建集团福建省电力勘测设计院有限公司 Novel flexible DC converter based on two from three mode becomes fire-fighting system
CN109985334A (en) * 2019-03-13 2019-07-09 国网宁夏电力有限公司电力科学研究院 A kind of transformer intensity of a fire suppressing method and system
CN110057489A (en) * 2019-05-07 2019-07-26 北京中瑞和电气有限公司 A kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature
CN112066259A (en) * 2019-06-11 2020-12-11 特变电工沈阳变压器集团有限公司 Automatic quick oil discharge system for converter transformer
CN112147500A (en) * 2020-09-25 2020-12-29 国网安徽省电力有限公司电力科学研究院 Gas relay calibration device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010027908A (en) * 2008-07-22 2010-02-04 Mitsubishi Electric Corp Oil-filled electric apparatus state analyzing device, and oil-filled electric apparatus state analyzing method
CN201783112U (en) * 2010-08-06 2011-04-06 陕西德凯电力机械有限公司 Oil-immersed transformer pressure-protection nitrogen-charging fire-extinguishing device
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
CN203370216U (en) * 2013-07-05 2014-01-01 赖耀华 Transformer with nitrogen-injection fire extinguishing device
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010027908A (en) * 2008-07-22 2010-02-04 Mitsubishi Electric Corp Oil-filled electric apparatus state analyzing device, and oil-filled electric apparatus state analyzing method
CN201783112U (en) * 2010-08-06 2011-04-06 陕西德凯电力机械有限公司 Oil-immersed transformer pressure-protection nitrogen-charging fire-extinguishing device
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
CN203370216U (en) * 2013-07-05 2014-01-01 赖耀华 Transformer with nitrogen-injection fire extinguishing device
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

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
吴簪麟: "油浸变压器防爆防火灭火装置的工况分析及检修探讨", 《山东电力技术》 *
江华生: "500kV变电所油浸电力变压器灭火***的选用", 《消防技术与产品信息》 *
靳自兵: "排油充氮灭火装置在电力变压器防火保护中的应用探讨", 《中国公共安全(学术版)》 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108257346A (en) * 2018-01-10 2018-07-06 宁波海蔓汽车科技有限公司 Reactor explosion alarming device
CN109701182A (en) * 2018-12-23 2019-05-03 中国电建集团福建省电力勘测设计院有限公司 Novel flexible DC converter based on two from three mode becomes fire-fighting system
CN109701182B (en) * 2018-12-23 2023-09-19 中国电建集团福建省电力勘测设计院有限公司 Novel flexible direct-current converter transformer fire-fighting fire-extinguishing system based on three-taking-two mode
CN109985334A (en) * 2019-03-13 2019-07-09 国网宁夏电力有限公司电力科学研究院 A kind of transformer intensity of a fire suppressing method and system
CN110057489A (en) * 2019-05-07 2019-07-26 北京中瑞和电气有限公司 A kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature
CN112066259A (en) * 2019-06-11 2020-12-11 特变电工沈阳变压器集团有限公司 Automatic quick oil discharge system for converter transformer
CN112147500A (en) * 2020-09-25 2020-12-29 国网安徽省电力有限公司电力科学研究院 Gas relay calibration device
CN112147500B (en) * 2020-09-25 2023-10-31 国网安徽省电力有限公司电力科学研究院 Gas relay calibration device

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Application publication date: 20151223