CN104721992A - Combined distribution type oil discharging and nitrogen inflating fire extinguishing system and method - Google Patents
Combined distribution type oil discharging and nitrogen inflating fire extinguishing system and method Download PDFInfo
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- CN104721992A CN104721992A CN201510118997.5A CN201510118997A CN104721992A CN 104721992 A CN104721992 A CN 104721992A CN 201510118997 A CN201510118997 A CN 201510118997A CN 104721992 A CN104721992 A CN 104721992A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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Abstract
The invention discloses a combined distribution type oil discharging and nitrogen inflating fire extinguishing system. The combined distribution type oil discharging and nitrogen inflating fire extinguishing system comprises a nitrogen gas source, a control cabinet, a fire disaster detector arranged on the top of each transformer, and a transformer oil storage control system with a gas relay, a transformer oil discharging system with an oil discharging control valve and a transformer nitrogen inflating system with a nitrogen inflating control valve which are arranged on each transformer; the transformer nitrogen inflating systems are connected with the nitrogen gas source; the fire disaster detectors, the gas relays, the oil discharging control valves and the nitrogen inflating control valves are electrically connected with the control cabinet; each nitrogen inflating system comprises a unidirectional throttling valve, a nitrogen inflating pipeline and a constant-temperature valve; each nitrogen inflating pipeline is communicated with the nitrogen gas source and penetrates through a transformer wall body at the lower side part of an oil storage cabinet to extent into the oil storage cabinet; and each constant-temperature valve is arranged on the corresponding nitrogen inflating pipeline in the oil storage cabinet, and each unidirectional throttling valve is arranged on the nitrogen inflating pipeline between the corresponding nitrogen inflating control valve and the corresponding transformer. The combined distribution type oil discharging and nitrogen inflating fire extinguishing system has a very good application value in industry.
Description
Technical field
The present invention relates to oil-filled transformer technical field of fire control, be specifically related to a kind of combined imputation type oil extraction and fill nitrogen fire extinguishing system and extinguishing method.
Background technology
Oil-filled transformer is the core component of transformer station, and most transformer station all adopts Large Oil immersion transformer as main transformer.There is in the oil conservater of oil-filled transformer the transformer oil measuring greatly insulating radiation effect.Transformer oil flash is at about 135 DEG C under normal circumstances, but after oil-filled transformer uses a period of time, if transformer occur inside occur loose contact, turn-to-turn short circuit or overlond running time, can cause oil conservater internal high temperature, high temperature can make transformer oil cracking produce the inflammable gases such as H2, C2H2.Above-mentioned inflammable gas is blended in transformer oil, causes transformer oil flash to drop to about 50 DEG C, significantly lower than the upper limit running temperature 85 DEG C of oil-filled transformer.
Have the oil-filled transformer of the inflammable gases such as H2, C2H2 in oil conservater, if there is breaking, transformer oil produces with extraneous air and contacts, as long as oil storage in-cabinet temperature is more than 50 DEG C, transformer oil vigorous combustion will be caused, cause oil-filled transformer to explode, bring the heavy losses of property.Therefore, regulation individual capacity is that the main transformer of more than 125MVA should arrange fire extinguishing system in " thermal power plant and Substation Design fire safety rules " (GB50229-2006).It is the extinguishing device that the current most main transformer of transformer substation of China adopts that nitrogen extinguishing device is filled in oil extraction.
As shown in Figure 2, oil extraction is filled nitrogen extinguishing device and is comprised switch board A11, transformer oil storage control system, transformer oil draining system, transformer Nitrogen filling system, is arranged on the fire detector A10 of transformer top.Wherein, transformer oil storage control system comprises the fuel feed pump being arranged on oil conservater A12 top and being connected with oil conservater A12, the conservator A1 be connected with the fuel feeding end of fuel feed pump, in the fuel feed pump near transformer, be provided with Buchholz relay A3, the fuel feed pump near conservator A1 is provided with flow control valve A2; Transformer oil draining system comprises the drain line A5 being arranged on oil conservater A12 upper lateral part and being connected with oil conservater A12, be arranged on the oil hole A4 immediately below drain line A5 oil-out, be arranged on the oil extraction control valve A6 on drain line A5, the setting position of drain line A5 on oil conservater A12 is lower than the setting position of fuel feed pump on oil conservater A12; Transformer Nitrogen filling system comprises Nitrogen source gases A7, and nitrogen blanketing valve road A8, Nitrogen source gases A7 are connected with oil conservater A12 by nitrogen blanketing valve road A8, and nitrogen blanketing valve road A8 is provided with and fills nitrogen control valve A9; Buchholz relay A3, fire detector A10, oil extraction control valve A6, fill nitrogen control valve A9 and be all electrically connected with switch board A11, switch board A11 is made up of central processing unit, touch-screen and contactless solid-state relay usually.When transformer fault, if when oil conservater A12 internal temperature and pressure are elevated to setting value, fire detector A10 and Buchholz relay A3 works, and produces alarm signal and passes to switch board A11; After the switch trip of main transformer three side, switch board A11 instruction oil extraction control valve A6 opens and oil conservater A12 inner top deep fat is drained into oil hole A4 fast with release pressure, and meanwhile, the flow control valve A2 between conservator A1 and oil conservater A12 closes automatically; When insulating oil drain time reaches setting duration, switch board A11 instruction is filled nitrogen control valve A9 and is opened the nitrogen being injected setting pressure and flow by nitrogen blanketing valve road A8 in oil conservater A12.Nitrogen enters in oil conservater A12, rises to insulating oil top with intensive bubble form bottom insulating oil, and nitrogen covers oil meter face gradually, makes oily surface oxygen content reach minimum, effectively fire-retardant, eliminates disaster hidden-trouble in A-stage.Simultaneously in nitrogen uphill process, because oil reservoir upper and lower in oil conservater A12 is stirred mixing, reduce the temperature contacting pasta with air fast.
But because transformer station has very complicated electromagnetic environment, after fire detector A10 and Buchholz relay A3 uses a period of time, rate of false alarm increases along with the increase of service time, and wrong report can allow oil extraction fill the malfunction of nitrogen extinguishing device, cause main transformer to trip, cause large area burst power outage.Report to reduce the harm that brings by mistake, during the actual operation of transformer station, by every platform immersion transformer, arrange a set of oil extraction fill nitrogen extinguishing device, manually operation oil extraction fills nitrogen extinguishing device to go out the disaster hidden-trouble except transformer.
Technique scheme, realize the fire extinguishing system construction of whole transformer station, needs to fill nitrogen extinguishing device to the oil extraction that every platform transformer configuration is independent, and fire extinguishing system construction and maintenance cost are very high.Even if build up, carry out extinguishing operation to multiple transformer, need repeatedly manual operation, the personal safety of the lower operating personnel of operating efficiency can not get ensureing.
Publication number is the Chinese patent literature of CN203763724U, installation oil extraction is needed to fill nitrogen extinguishing device for each transformer, carry out putting out a fire to multiple transformer and need to carry out the technical problem of repeatedly manual working, disclose a kind of main transformer oil extraction and fill nitrogen extinguishing device.This device is made up of fire detector, selection cut-off valve, selection nitrogen fill valve, selection draining valve, fire hydrant cabinet, switch board; Select draining valve, select nitrogen fill valve, select cut-off valve to be magnetic valve; Be provided with a set of oil extraction in switch board and fill nitrogen extinguishing device control loop, the fire signal that the fire detector that this control loop receives two main transformer tops sends, and control to select draining valve, select nitrogen fill valve and select cut-off valve; The a set of nitrogen cylinder filling nitrogen fire extinguishing for two main transformers is provided with in fire hydrant cabinet; Nitrogen extinguishing device is filled in this oil extraction can protect two main transformers simultaneously; When main transformer breaking out of fire, the fire signal that the fire detector catching fire main transformer top sends, fire signal is uploaded to switch board, determine the main transformer that catches fire, send unblanking by switch board and correspond to selection draining valve on owner of the house where a fire started's transformer drain line, some transformers oil is drained into emergency oil pond; Switch board sends signal at stop and catches fire main transformer conservator to the selection cut-off valve in fuel tank feed circuit; Switch board sends the selection nitrogen fill valve that unblanking catches fire on the nitrogen blanketing valve road of main transformer, fills nitrogen facing to owner of the house where a fire started's transformer, reaches the effect of fire extinguishing.But because the program does not solve after fire detector and Buchholz relay use a period of time, rate of false alarm increases along with the increase of service time, wrong report can allow the malfunction of oil extraction nitrogen charging device, main transformer is caused to trip, cause the technical problem of large area burst power outage, therefore, the program is that technical one realizes possibility, does not have industry using value.
Publication number is the Chinese patent literature of CN201643489U, installation oil extraction is needed to fill nitrogen extinguishing device for each transformer, carry out putting out a fire to multiple transformer and need to carry out the technical problem of repeatedly manual working, as shown in Figure 3, disclose a kind of combined imputation type oil extraction and fill nitrogen fire extinguishing system, this system comprises and is positioned at fire detector B4 on each single-phase transformer and Buchholz relay B3, Buchholz relay B3 connects conservator B1 by control fuel tap, and each single-phase transformer is all configured with drain line B9 and inflated with nitrogen pipeline B10, the drain line B9 of each single-phase transformer arranges draining valve B11, this system also comprises one group of nitrogen cylinder B5, and the outlet of nitrogen cylinder B5 arranges a header B12, header B12 connects at least two selector valve B13, selector valve B13 and communicates with inflated with nitrogen pipeline B10, selector valve B13, draining valve B11, fire detector B4, the Buchholz relay B3 of described each single-phase transformer are all connected with controlling alarm cabinet B7 with flow control valve B2.This oil extraction is filled nitrogen extinguishing device and is achieved optimum management to multiple single-phase transformer extinguishing action.But because the program does not solve after fire detector and Buchholz relay use a period of time, rate of false alarm increases along with the increase of service time, wrong report can allow the malfunction of oil extraction nitrogen charging device, main transformer is caused to trip, cause the technical problem of large area burst power outage, therefore, the program is that technical one realizes possibility, does not have industry using value.
In sum, an existing switch board carries out the technical scheme of extinguishing operation to multiple oil-filled transformer, owing to not solving after fire detector and Buchholz relay use a period of time, rate of false alarm increases along with the increase of service time, wrong report can allow oil extraction fill the malfunction of nitrogen extinguishing device, causes main transformer to trip, and causes the technical problem of large area burst power outage, only belong to technical one and realize possibility, there is no industry using value.
Summary of the invention
Technical problem to be solved by this invention is to provide an operable switch board in a kind of industry and fills nitrogen fire extinguishing system to the combined imputation type oil extraction that multiple oil-filled transformer carries out extinguishing operation, thus the use cost of nitrogen fire extinguishing system is filled in the transformer oil extraction reducing transformer station further, improve running quality and operational efficiency that nitrogen fire extinguishing system is filled in oil extraction.
The technical scheme that technical solution problem of the present invention adopts is:
Nitrogen fire extinguishing system is filled in combined imputation type oil extraction, comprise Nitrogen source gases, switch board, be arranged on the fire detector of each transformer top, be arranged on the transformer oil storage control system of the band Buchholz relay on each transformer, be with the transformer oil draining system of oil extraction control valve, be with the transformer Nitrogen filling system filling nitrogen control valve, the transformer Nitrogen filling system of each transformer is all connected with Nitrogen source gases; Fire detector, Buchholz relay, the oil extraction control valve of each transformer, fill nitrogen control valve and be all electrically connected with switch board; The Nitrogen filling system of each transformer also comprises one-way throttle valve, nitrogen blanketing valve road, constant temperature valve, the source of the gas link on nitrogen blanketing valve road is connected with Nitrogen source gases, the oil conservater link on nitrogen blanketing valve road extends in oil conservater through the transformer wall body of oil conservater following side, constant temperature valve is arranged on the nitrogen blanketing valve road in oil conservater, and one-way throttle valve is arranged on the nitrogen blanketing valve road filled between nitrogen control valve and transformer.
Further, the nitrogen blanketing valve road of the transformer Nitrogen filling system of each transformer becomes at least two at corresponding transformer external shunt and fills nitrogen arm, every root fills nitrogen arm and all extends in oil conservater through the transformer wall body of oil conservater following side, and the every root in oil conservater fills on nitrogen arm and is provided with constant temperature valve.
Further, Nitrogen source gases comprises nitrogen cylinder group and header, nitrogen cylinder group comprises at least two nitrogen cylinders, header comprises gas transmission supervisor and parallel at least two arms that conflux be arranged on gas transmission supervisor, each arm that confluxes is responsible for gas transmission and is connected, the gas outlet of each nitrogen cylinder is corresponding with header arm that confluxes to be communicated with, and gas transmission supervisor is connected with nitrogen blanketing valve road.
Further, the transformer Nitrogen filling system of each transformer also comprises air bleeding valve, and air bleeding valve is arranged on the nitrogen blanketing valve road between the one-way throttle valve of corresponding transformer Nitrogen filling system and transformer.
The present invention also soluble technical problem is to provide a kind of combined imputation type oil extraction that can industrially apply and fills nitrogen extinguishing method, comprises the following steps:
Step 1, nitrogen storage tolerance control: need oil extraction to fill in the oil-filled transformer of nitrogen flame failure protection with all, the nitrogen amount that maximum that oil-filled transformer of oil conservater capacity once fills nitrogen fire extinguishing calculates a reference value as nitrogen storage gauge, this nitrogen storage gauge is calculated a reference value and take advantage of 2 as the nitrogen gross reserves of Nitrogen source gases, be filled with the nitrogen of this nitrogen gross reserves by nitrogen charging device to Nitrogen source gases; The computing formula that nitrogen storage gauge calculates a reference value is:
V＝K*S*Q*T
Wherein, V is that nitrogen storage gauge calculates a reference value, and K is the safety coefficient of maximum that oil-filled transformer of oil conservater capacity, and the span of K is 1.05 ~ 1.30; S is the horizontal projected area of maximum that oil-filled transformer of oil conservater capacity; To be nitrogen blanketing valve road fill nitrogen fire extinguishing to that oil-filled transformer that oil conservater capacity is maximum to Q fills nitrogen intensity, is also the nitrogen amount that unit projection area passes through within the unit interval; T is that the duration of nitrogen fire extinguishing is filled to that oil-filled transformer that oil conservater capacity is maximum in nitrogen blanketing valve road.
Step 2, pre-oil extraction of reporting to the police fill nitrogen: distribute an address code on switch board each oil-filled transformer, after switch board receives the alarm signal of Buchholz relay or fire detector, judge alarm signal is from which oil-filled transformer, and recall oil extraction time of carrying out needed for this oil-filled transformer and needed for the nitrogen amount that passes into, the oil extraction control valve of the oil draining system of this oil-filled transformer of switch board is opened, discharge the insulating oil in this transformer oil storage, meanwhile, the flow control valve between conservator and oil conservater is closed automatically; When insulating oil drain time reaches scheduled duration, the nitrogen control valve that fills of the transformer Nitrogen filling system of this transformer of switch board instruction is opened, and passes into the nitrogen of setting pressure and flow in nitrogen blanketing valve road;
Step 3, temperature control fill nitrogen fire extinguishing: when the insulating oil temperature in oil storage tank of oil immersed transformer reaches predetermined temperature, constant temperature valve opening, by being filled with nitrogen in nitrogen blanketing valve road direction Oil Tank, carry out filling nitrogen fire extinguishing.
Further, the residual nitrogen got rid of in nitrogen blanketing valve road is also comprised: air bleeding valve is set on the nitrogen blanketing valve road between the one-way throttle valve and transformer of the transformer Nitrogen filling system of each transformer after step 3, when constant temperature valve closing, oil extraction is filled after nitrogen operation completes, open air bleeding valve, the nitrogen discharge remained in nitrogen blanketing valve road is fallen.
Combined imputation type oil extraction of the present invention is filled nitrogen fire extinguishing system and is applicable to carry out oil extraction to the transformer of transformer station and fills nitrogen extinguishing operation, and its transformer cluster that also can be used for industrial zone or Campus carries out oil extraction and fills nitrogen extinguishing operation.
Compared with prior art, the invention has the beneficial effects as follows:
1, nitrogen fire extinguishing system is filled in combined imputation type oil extraction of the present invention, in oil conservater, nitrogen is passed into based on alarm signal compared to prior art, the transformer allowing transformer switch trip fills nitrogen fire-fighting technique scheme, the present invention adopts and in nitrogen blanketing valve road, passes into nitrogen based on alarm signal in advance, reach fire alarm temperature unlatching constant temperature valve based on the insulating oil oil temperature in oil conservater and pass into nitrogen in oil conservater, the transformer allowing transformer switch trip fills nitrogen fire-fighting technique scheme.The present invention when do not reduce prior art fill nitrogen timeliness, employing is immersed in insulating oil, the high-intensity electromagnetic radiation of transformer station does not produce any impact to its action, the constant temperature valve be consistent with insulating oil temperature controls whether in oil conservater, to pass into nitrogen, the accuracy of filling nitrogen operation is high, good reliability, stability is high, can in time the disaster hidden-trouble in oil conservater be eliminated in A-stage, the possibility of very big reduction transformer switch mistrip, corresponding also would not cause large area happen suddenly power outage.Because the present invention adopts the constant temperature valve independent of switch board accurately to control to fill nitrogen operation, thus the technology consequence of any actuation of an alarm of fire detector and Buchholz relay is limited in preliminary filling nitrogen and prepares, also would not fill nitrogen because fire detector or Buchholz relay wrong report cause oil extraction to fill nitrogen fire extinguishing system to oil conservater by mistake, cause transformer to trip, cause large area burst power outage.Therefore the switch board of nitrogen fire extinguishing system core is filled as existing oil extraction and transformer Nitrogen filling system can be accomplished simple as far as possible in design, functionally unexpectedly may be targetedly, manufacturing cost and maintenance cost also can significantly reduce, also just because of this, switch board assembly of the present invention can pass into nitrogen control operation in advance for the transformer Nitrogen filling system of more oil-filled transformers provides, transformer oil draining system for more oil-filled transformers provides oil extraction to control operation, Nitrogen source gases assembly of the present invention can provide high pressure nitrogen for the transformer Nitrogen filling system of more oil-filled transformers, also namely the invention provides an operable switch board in a kind of industry and nitrogen fire extinguishing system is filled to the combined imputation type oil extraction that multiple oil-filled transformer carries out extinguishing operation.
2, nitrogen fire extinguishing system is filled in combined imputation type oil extraction of the present invention, in oil conservater, nitrogen is filled owing to adopting at least two nitrogen arms that fill being provided with constant temperature valve, point that can be higher according to disaster hidden-trouble occurrence probability, arrange targeted specifically and fill nitrogen arm, thus disaster hidden-trouble can be reduced fast, gain time for thoroughly eliminating disaster hidden-trouble.
3, nitrogen fire extinguishing system is filled in combined imputation type oil extraction of the present invention, owing to adopting at least two nitrogen cylinders coupled together by header as Nitrogen source gases, effectively can reduce Nitrogen source gases construction cost and the use cost of the transformer station in remote area, improve ease for use and environmental suitability that nitrogen fire extinguishing system is filled in oil-filled transformer oil extraction of the present invention.
4, nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention, an address code is distributed to each oil-filled transformer owing to adopting, realize the location to alarm signal, the oil extraction of oil extraction control valve is precisely controlled for alarm signal, control to fill nitrogen control valve 9 and pass into nitrogen in advance to the nitrogen blanketing valve road of corresponding transformer, in oil conservater, pass into nitrogen prepare for follow-up; Owing to adopting the constant temperature valve be built in oil conservater insulating oil to respond to the temperature of insulating oil, control to be filled with nitrogen in nitrogen blanketing valve road direction oil conservater by the unlatching of constant temperature valve, carry out filling nitrogen fire extinguishing; Control to be filled with nitrogen in nitrogen blanketing valve road direction oil conservater based on alarm signal relative to prior art, carry out filling nitrogen fire extinguishing; Nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention, when do not reduce fill nitrogen timeliness, adopt very little nitrogen Expenses Cost, the alarm signal wrong report harm that the art methods just effectively eliminating alarm signal control nitrogen blanketing valve road causes, fill nitrogen extinguishing method based on the combined imputation type oil extraction of the present invention of insulating oil temperature in oil conservater simultaneously, specific aim is stronger, accuracy rate is higher, stability is higher, can eliminate in A-stage by the disaster hidden-trouble in oil conservater in time, its industrial applicability be also better.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of the oil extraction nitrogen charging device of prior art.
Fig. 3 is the structural representation that nitrogen fire extinguishing system is filled in the oil extraction of CN201643489U combined imputation type.
Fig. 4 is the flow chart that nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention.
Fig. 5 is the preferred implementing procedure figure that nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention.
In Fig. 1, Reference numeral is expressed as: 1-conservator, 2-flow control valve, 3-Buchholz relay, 4-oil hole, 5-drain line, 6-oil extraction control valve, 7-Nitrogen source gases, 8-nitrogen blanketing valve road, 9-fill nitrogen control valve, 10-fire detector, 11-control cabinet, 12-oil conservater, 501-oil extraction pipe valve, 801-one-way throttle valve, 802-air bleeding valve, 803-constant temperature valve.
In Fig. 2, Reference numeral is expressed as: A1-conservator, A2-flow control valve, A3-Buchholz relay, A4-oil hole, A5-drain line, A6-oil extraction control valve, A7-Nitrogen source gases, A8-nitrogen blanketing valve road, A9-fill nitrogen control valve, A10-fire detector, A11-control cabinet, A12-oil conservater, A501-oil extraction pipe valve, A801-one-way throttle valve, A802-air bleeding valve.
In Fig. 3, Reference numeral is expressed as: B1-conservator, B2-flow control valve, B3-Buchholz relay, B4-fire detector, B5-nitrogen cylinder, B6-fire hydrant cabinet, B7-controlling alarm cabinet, B8-oil hole, B9-drain line, B10-inflated with nitrogen pipeline, B11-draining valve, B12-header, B13-selector valve.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, nitrogen fire extinguishing system is filled in combined imputation type oil extraction of the present invention, comprise Nitrogen source gases 7, switch board 11, be arranged on the fire detector 10 of each transformer top, be arranged on the transformer oil storage control system of the band Buchholz relay 3 on each transformer, be with the transformer oil draining system of oil extraction control valve 6, be with the transformer Nitrogen filling system filling nitrogen control valve 9, the transformer Nitrogen filling system of each transformer is all connected with Nitrogen source gases 7; Fire detector 10, Buchholz relay 3, the oil extraction control valve 6 of each transformer, fill nitrogen control valve 9 and be all electrically connected with switch board 11; The Nitrogen filling system of each transformer also comprises one-way throttle valve 801, nitrogen blanketing valve road 8, constant temperature valve 803, the source of the gas link on nitrogen blanketing valve road 8 is connected with Nitrogen source gases 7, the oil conservater link on nitrogen blanketing valve road 8 extends in oil conservater 12 through the transformer wall body of oil conservater 12 following side, constant temperature valve 803 is arranged on the nitrogen blanketing valve road 8 in oil conservater 12, and one-way throttle valve 801 is arranged on the nitrogen blanketing valve road 8 filled between nitrogen control valve 9 and transformer.
During the invention process, as shown in Figure 1, oil extraction can be carried out at least two transformers and fill nitrogen extinguishing operation.
During the invention process, as shown in Figure 1, the transformer oil storage control system be arranged on each transformer includes conservator 1, fuel feed pump, flow control valve 2, wherein conservator 1 is connected with oil conservater 12 by fuel feed pump, flow control valve 2 is arranged on the fuel feed pump of conservator 1, and the above-mentioned part of transformer oil storage control system is the part of oil-filled transformer; Be arranged on transformer oil draining system on each transformer to form by oil hole 4, drain line 5.
As shown in Figure 1, those skilled in the art, according to the oil capacity of the oil conservater 12 of the maximum transformer of oil content, determine the nitrogen capacity that Nitrogen source gases 7 should have and maximum nitrogen air pressure, determine the volume in oil hole 4, adopt the present invention to carry out the space layout situation that the oil-filled transformer of nitrogen extinguishing operation is filled in oil extraction according to all needs, determine the setting position of Nitrogen source gases 7, switch board 11, according to the physical dimension of self and the surrounding environment of each oil-filled transformer, determine the setting position of oil hole 4, fire detector 10, carry out the oil-filled transformer quantity that nitrogen extinguishing operation is filled in oil extraction as required, determine the number of the control logic of switch board 11, according to the layout of oil-filled transformer, switch board 11 distributes an address code to each oil-filled transformer, this address code is to should the Buchholz relay 3 of oil-filled transformer, fire detector 10, oil extraction control valve 6, fill nitrogen control valve 9, switch board can be judged, and alarm signal is from which oil-filled transformer, the oil extraction control valve 6 controlling which oil-filled transformer is needed to open, how long the oil extraction time is, the nitrogen control valve 9 that fills controlling which oil-filled transformer is needed to open, it is how many for filling nitrogen quantity, fill how long the nitrogen time is, according to specification and the layout on above-mentioned setting position determination drain line 5 and nitrogen blanketing valve road 8, according to the caliber specification of drain line 5, determine the specification of oil extraction control valve 6, according to the caliber specification on nitrogen blanketing valve road 8, determine the specification of filling nitrogen control valve 9, one-way throttle valve 801, constant temperature valve 803.
Nitrogen source gases 7 is high-pressure air source, it can be high pressure nitrogen pipe network, also can adopt at least two nitrogen cylinders composition nitrogen cylinder groups, the gas outlet of each nitrogen cylinder is corresponding with header arm that confluxes to be communicated with, and being responsible for by header gas transmission provides high pressure nitrogen to nitrogen blanketing valve road 8.Large-scale main transformer cluster for large-scale substation then adopts high pressure nitrogen pipe network as Nitrogen source gases 7; For medium-sized, small-sized main transformer cluster, or less than 3 large-scale main transformers then adopt nitrogen cylinder group.
Wherein, constant temperature valve 803, for a kind of gas-liquid valve just come into operation in the recent period, it has when the temperature of insulating oil is higher than predetermined temperature, and constant temperature valve 803 is opened automatically, when the temperature of insulating oil is lower than predetermined temperature, the technical role that constant temperature valve 803 is closed automatically, the operating temperature of constant temperature valve 803 is adjustable to 170 DEG C from 70 DEG C, and those skilled in the art can be arranged according to actual needs, as the constant temperature delivery water valve of Beijing Han Darui new science and technology Co., Ltd; Fill nitrogen control valve 9, oil extraction control valve 6 can be motor-driven valve can be also magnetic valve, usually adopt motor-driven valve; One-way throttle valve 801 is one-way conduction valve, and it allows nitrogen to flow to oil conservater 12 along nitrogen blanketing valve road 8 from Nitrogen source gases 7, does not allow the nitrogen flowed between one-way throttle valve 801 and oil conservater 12 to reflux to Nitrogen source gases 7.
During enforcement, those skilled in the art, arrange Buchholz relay 3 in the fuel feed pump of the oil storage control system first on each transformer, and the setting position of Buchholz relay 3, near transformer, arranges fire detector 10 at the top of each transformer, Nitrogen source gases 7 is then set, the transformer wall body of oil conservater 12 following side of each transformer offers nitrogen blanketing valve road 8 providing holes, oil conservater 12 link on the nitrogen blanketing valve road 8 of each transformer extends in this oil conservater 12 by this providing holes, nitrogen blanketing valve road 8 in oil conservater 12 arranges constant temperature valve 803, constant temperature valve 803 is immersed in the insulating oil in oil conservater 12, nitrogen blanketing valve road 8 near Nitrogen source gases 7 is arranged and fills nitrogen control valve 9, one-way throttle valve 801 is set filling on the nitrogen blanketing valve road 8 between nitrogen control valve 9 and transformer, Nitrogen source gases 7 link on this nitrogen blanketing valve road 8 is connected with Nitrogen source gases 7.The transformer Nitrogen filling system of each oil-filled transformer is can be made into by above-mentioned steps; Then the precalculated position around each oil-filled transformer arranges oil hole 4, the transformer wall body of each oil conservater 12 upper lateral part offers drain line 5 providing holes, drain line 5 providing holes is lower than the setting position of fuel feed pump on this oil conservater 12, by drain line 5 providing holes, drain line 5 is connected with oil conservater 12, the oil-out of drain line 5 is positioned at directly over oil hole 4, drain line 5 arranges oil extraction control valve 6, be can be made into the transformer oil draining system of each oil-filled transformer by above-mentioned steps; Then switch board 11 is arranged on precalculated position, by the fire detector 10 of each transformer, Buchholz relay 3, oil extraction control valve 6, fill nitrogen control valve 9 and be electrically connected a control logic in corresponding switch board 11, and distribute an address code on switch board 11 each transformer.Can be made into oil-filled transformer oil extraction of the present invention by above-mentioned steps and fill nitrogen fire extinguishing system.
During the invention process, Nitrogen source gases 7 export pipeline is also provided with high-pressure manometer, pressure-reducing valve, low pressure gauge, high-pressure manometer is electrically connected with switch board 11, can be judged the gas-storing capacity of Nitrogen source gases 7 by high-pressure manometer switch board 11.
During use, the inflammable gases such as H2, C2H2 in the oil conservater 12 of a certain oil-filled transformer are accumulated to a certain degree, inflammable gas pours in the fuel feed pump of this transformer, and advance along fuel feed pump to conservator 1, when arrive the inflammable gas concentration of Buchholz relay 3 reach a certain amount of after, Buchholz relay 3 works, and produces alarm signal and the corresponding control logic passed on switch board 11.Switch board judges alarm signal is from which oil-filled transformer, the oil extraction control valve 6 of the oil draining system of this transformer of instruction is opened, in the oil conservater 12 of this transformer, insulating oil drains into oil hole 4 with release pressure fast by drain line 5, meanwhile, the flow control valve 2 between conservator 1 and oil conservater 12 is closed automatically; When insulating oil drain time reaches setting duration, this transformer of switch board 11 instruction the nitrogen control valve 9 that fills of transformer Nitrogen filling system open, in nitrogen blanketing valve road 8, pass into the nitrogen of setting pressure and flow.Because constant temperature valve 803 is immersed in the insulating oil in oil conservater 12, the valve body temperature of constant temperature valve 803 and the temperature of insulating oil are consistent, insulating oil temperature does not reach the open temp of constant temperature valve 803, constant temperature valve 803 keeps closed condition, open and fill the nitrogen that nitrogen control valve 9 is filled with and rest in nitrogen blanketing valve road 8, transformer continues to keep normal duty.Once insulating oil temperature rises to the open temp of constant temperature valve 803, constant temperature valve 803 is opened, the switch trip of transformer, nitrogen enters in oil conservater 12, spring up to insulating oil top from bottom insulating oil with intensive bubble form, the nitrogen sprung up causes the upper and lower oil reservoir in oil conservater 12 to stir mixing, contact oil surface temperature with air to decline fast, when nitrogen rises to insulating oil top, blanket of nitrogen is formed on insulating oil top, by the oxygen gases separated in insulating oil and air, effectively fire-retardant, disaster hidden-trouble is eliminated in A-stage.When in oil conservater 12, the temperature of insulating oil drops to uniform temperature, constant temperature valve 803 is closed.
When the fire detector 10 at the top being arranged on a certain oil-filled transformer is reported to the police, after alarm signal passes to switch board 11, working method of the present invention is the same with the working method that Buchholz relay 3 alarm signal passes to after switch board 11, only when the insulating oil temperature in oil conservater 12 reaches the open temp of constant temperature valve 803, constant temperature valve 803 is just opened, just can to oil conservater 12 nitrogen injection, the switch of transformer just can trip.
When being arranged on the fire detector 10 at top of a certain oil-filled transformer, and the Buchholz relay 3 be arranged in fuel feed pump is all to warning, and after respective alarm signal is passed to switch board 11, working method of the present invention is the same with the working method that Buchholz relay 3 alarm signal passes to after switch board 11, only when the insulating oil temperature in oil conservater 12 reaches the open temp of constant temperature valve 803, constant temperature valve 803 is just opened, just can to oil conservater 12 nitrogen injection, the switch of transformer just can trip.
It is more than basic embodiment of the present invention.As can be seen from above-mentioned implementation process, each voltage device by fire detector 10, Buchholz relay 3, switch board 11, Nitrogen source gases 7, nitrogen blanketing valve road 8, fill the warning Nitrogen filling system that nitrogen control valve 9 combines, have and pass into nitrogen in advance in nitrogen blanketing valve road 8, for the follow-up technical role passing into nitrogen and prepare in oil conservater 12, also be the automatic control operation of switch board 1 for alarm signal, fill the first of nitrogen fire extinguishing system from existing oil extraction and pass into nitrogen to nitrogen blanketing valve road 8, in oil conservater 12, be directly filled with nitrogen be restricted to of the present invention and pass into nitrogen through nitrogen blanketing valve road 8 in advance to nitrogen blanketing valve road 8, thus the technology consequence of any actuation of an alarm of fire detector 10 and Buchholz relay 3 is limited in preliminary filling nitrogen and prepares, also would not fill nitrogen because fire detector 10 or Buchholz relay 3 wrong report cause oil extraction to fill nitrogen fire extinguishing system to oil conservater 12 by mistake, transformer is caused to trip, cause large area burst power outage.Nitrogen blanketing valve road 8 and the constant temperature valve 803 be built in insulating oil combine, have and in oil conservater 12, when be filled with nitrogen according to the insulating oil temperature decision in oil conservater 12 and when stop being filled with the technical role of nitrogen, also namely adopt and have the insulating oil oil temperature of decision impact automatically to control to fill nitrogen operation on fire, thus realize only having when the insulating oil temperature in oil conservater 12 reaches early warning temperature, really there is the possibility of fire in transformer, transformer switch is just allowed to trip, in oil conservater 12, pass into nitrogen fast, disaster hidden-trouble is eliminated in A-stage; Simultaneously, based on above-mentioned technical role, nitrogen blanketing valve road 8 and the constant temperature valve 803 be built in insulating oil combine, also have that to make transformer Nitrogen filling system respond alarm signal part in the outer part of transformer oil storage 12 and corresponding switch board 11 simpler in design, only need realize responding the alarm signal of fire detector 10 and Buchholz relay 3, and pass into the technical role of nitrogen in advance in nitrogen blanketing valve road 8; The Nitrogen source gases 7 transformer Nitrogen filling system had for multiple transformer provides the technical role of high pressure nitrogen, thus relatively improves the service efficiency of Nitrogen source gases 7 and reduce the use cost of Nitrogen source gases 7.
As can be seen here, see on the whole, each part of the present invention is interrelated technically, and operation cooperatively interacts.In oil conservater 12, nitrogen is passed into based on alarm signal compared to prior art, the transformer allowing transformer switch trip fills nitrogen fire-fighting technique scheme, the present invention adopts and in nitrogen blanketing valve road 8, passes into nitrogen based on alarm signal in advance, reach fire alarm temperature unlatching constant temperature valve 803 based on the insulating oil oil temperature in oil conservater 12 and pass into nitrogen in oil conservater 12, the transformer allowing transformer switch trip fills nitrogen fire-fighting technique scheme.The present invention when do not reduce prior art fill nitrogen timeliness, employing is immersed in insulating oil, the high-intensity electromagnetic radiation of transformer station does not produce any impact to its action, the constant temperature valve 803 be consistent with insulating oil temperature controls whether in oil conservater 12, to pass into nitrogen, the accuracy of filling nitrogen operation is high, good reliability, stability is high, can in time the disaster hidden-trouble in oil conservater 12 be eliminated in A-stage, the possibility of very big reduction transformer switch mistrip, corresponding also would not cause large area happen suddenly power outage.Because the present invention adopts the constant temperature valve 803 independent of switch board 11 accurately to control to fill nitrogen operation, thus the technology consequence of any actuation of an alarm of fire detector 10 and Buchholz relay 3 is limited in preliminary filling nitrogen and prepares, also would not fill nitrogen because fire detector 10 or Buchholz relay 3 wrong report cause oil extraction to fill nitrogen fire extinguishing system to oil conservater 12 by mistake, cause transformer to trip, cause large area burst power outage.Therefore the switch board 11 of nitrogen fire extinguishing system core is filled as existing oil extraction and transformer Nitrogen filling system can be accomplished simple as far as possible in design, functionally unexpectedly may be targetedly, manufacturing cost and maintenance cost also can significantly reduce, also just because of this, switch board 11 assembly of the present invention can pass into nitrogen control operation in advance for the transformer Nitrogen filling system of more oil-filled transformers provides, transformer oil draining system for more oil-filled transformers provides oil extraction to control operation, Nitrogen source gases 7 assembly of the present invention can provide high pressure nitrogen for the transformer Nitrogen filling system of more oil-filled transformers, also namely the invention provides an operable switch board in a kind of industry and nitrogen fire extinguishing system is filled to the combined imputation type oil extraction that multiple oil-filled transformer carries out extinguishing operation.
Want the disaster hidden-trouble of quick eliminating transformer, need to the insulating oil fast cooling in oil conservater 12, simultaneously quick in oil conservater 12 insulating oil top form one deck blanket of nitrogen, by the oxygen gases separated in insulating oil and air.Existing oil extraction is filled nitrogen fire extinguishing system and is only adopted a nitrogen blanketing valve to pass in oil conservater 12, and the disaster hidden-trouble point usually in oil conservater 12 not often to be in oil conservater 12 directly over nitrogen blanketing valve, therefore can not reduce the temperature of disaster hidden-trouble point place insulating oil fast, blanket of nitrogen can not be formed fast at the insulating oil top at disaster hidden-trouble point place.
Fill nitrogen fire extinguishing quality to improve and fill nitrogen fire-fighting efficiency, the present invention improves further on the basis of basic embodiment, as shown in Figure 1, first preferred embodiment of the present invention is, the nitrogen blanketing valve road 8 of the transformer Nitrogen filling system of each transformer becomes at least two at corresponding transformer external shunt and fills nitrogen arm, every root fills nitrogen arm and all extends in oil conservater 12 through the transformer wall body of oil conservater 12 following side, and the every root in oil conservater 12 fills on nitrogen arm and is provided with constant temperature valve 803.
During enforcement, outside each transformer, nitrogen blanketing valve road 8 is split at least two and fills nitrogen arm, original nitrogen blanketing valve road 8 main line can fill nitrogen arm as one, nitrogen arm access apertures is filled by the transformer wall body of oil conservater 12 following side is arranged, filling nitrogen arm enters in oil conservater 12 by filling nitrogen arm access apertures, and the every root in oil conservater 12 fills on nitrogen arm and arranges constant temperature valve 803.In order to eliminate because the design defect of transformer own causes partial points easily to become the disaster hidden-trouble of disaster hidden-trouble point fast, filling nitrogen arm access apertures first is preferred embodiment arrange to fill nitrogen arm access apertures on the transformer wall body of the below easily becoming disaster hidden-trouble point, and the gas outlet filling nitrogen arm is positioned at easily to be become immediately below disaster hidden-trouble point; Be filled with nitrogen in order to improve by filling nitrogen arm, each disaster hidden-trouble point in time in process oil conservater 12, filling nitrogen arm access apertures second is preferred embodiment be distributed on the transformer wall body of oil conservater 12 outer peripheral face.
During use, when disaster hidden-trouble appears in oil conservater 12 top point, the constant temperature valve 803 that fill nitrogen arm on nearest according to this disaster hidden-trouble point takes the lead in opening, be filled with nitrogen, the nitrogen sprung up causes the insulating oil of this disaster hidden-trouble point bottom to roll up and down stirring, and the insulating oil temperature at disaster hidden-trouble point place reduces fast, blanket of nitrogen is formed on insulating oil top simultaneously at this disaster hidden-trouble point, by the oxygen gases separated in insulating oil and air, effectively fire-retardant, disaster hidden-trouble is eliminated in A-stage.To be rolled up and down stirring by the insulating oil of disaster hidden-trouble point bottom, other constant temperature valves 803 being arranged on oil conservater 12 bottom are also opened in succession, form the blanket of nitrogen of all standing fast, divided by the oxygen in insulating oil and air and separate completely at oil conservater 12 internal upper part.
As can be seen from the implementation process of the first preferred embodiment of the present invention, due to the point higher according to disaster hidden-trouble occurrence probability, arrange targeted specifically and fill nitrogen arm, therefore also just reducing disaster hidden-trouble fast, gaining time for thoroughly eliminating disaster hidden-trouble.
The construction cost of high pressure nitrogen pipe network is higher, along with the development of Transformer Manufacturing Technology, transformer occurs that the probability of fire also reduces gradually, therefore adopt high pressure nitrogen pipe network also very high as the use cost of Nitrogen source gases 7, it is only applicable to provide Nitrogen source gases 7 to the oil extraction Nitrogen filling system of large-scale main transformer cluster.For medium and small sized substation, it only only has several medium-sized or large-scale main transformer, and due to the live load of transformer lower, Nitrogen source gases 7 utilization rate of oil extraction Nitrogen filling system is low, but can not lack, also to be convenient to arrange according to the surrounding environment of transformer.
Therefore, in order to fill the high pressure nitrogen that nitrogen fire extinguishing system provides sufficient for the oil extraction of medium-sized or large-scale main transformer, the present invention improves further on the basis of the second preferred embodiment, as shown in Figure 1, 3rd preferred embodiment of the present invention is, Nitrogen source gases 7 comprises nitrogen cylinder group and header, nitrogen cylinder group comprises at least two nitrogen cylinders, header comprises gas transmission supervisor and parallel at least two arms that conflux be arranged on gas transmission supervisor, each arm that confluxes is responsible for gas transmission and is connected, the gas outlet of each nitrogen cylinder is corresponding with header arm that confluxes to be communicated with, gas transmission supervisor is connected with nitrogen blanketing valve road 8.
During enforcement, adopt at least two nitrogen cylinders composition nitrogen cylinder groups, the gas outlet of each nitrogen cylinder is corresponding with header arm that confluxes to be communicated with, thus formation Nitrogen source gases 7.During enforcement, selector valve can be set at the arm that confluxes, realize nitrogen cylinder by switch selector valve and to be responsible for gas transmission and to be communicated with or to disconnect.Gas transmission supervisor is connected with nitrogen blanketing valve road 8, thus is embodied as nitrogen blanketing valve road 8 high pressure nitrogen is provided.Obviously the nitrogen cylinder group coupled together by header has larger nitrogen storage capacity, and is convenient to arrange, and the use of nitrogen fire extinguishing system is filled in the oil extraction being more suitable for medium-sized or large-scale main transformer.For the transformer station of remote districts not having Nitrogen pipe network, adopt such scheme can fast, convenient composition Large Copacity Nitrogen source gases 7, for medium-sized or large-scale main transformer cluster provides high pressure nitrogen.
Oil extraction is filled after nitrogen operation completes, and also have high pressure nitrogen in nitrogen blanketing valve road 8 between constant temperature valve 803 and one-way throttle valve 801, high pressure nitrogen longer-term persistence, on this part nitrogen blanketing valve road 8, can have influence on the service life of constant temperature valve 803 and choke valve 801.
In order to discharge the high pressure nitrogen between constant temperature valve 803 and one-way throttle valve 801 in nitrogen blanketing valve road 8 in time, the basis of the present invention's any one embodiment in basic embodiment, the first to the 3rd preferred embodiment is improved further, 4th preferred embodiment of the present invention is, the transformer Nitrogen filling system of each transformer also comprises air bleeding valve 802, and air bleeding valve 802 is arranged on the nitrogen blanketing valve road 8 between the one-way throttle valve 801 of corresponding transformer Nitrogen filling system and transformer.
During use, high pressure nitrogen is discharged in time by the air bleeding valve 802 be arranged on the nitrogen blanketing valve road 8 between one-way throttle valve 801 and transformer, effectively can reduce the compression that one-way throttle valve 801 and constant temperature valve 803 bear, thus improve the service life of one-way throttle valve 801 and constant temperature valve 803 further.
It is more than the implementation process that nitrogen fire extinguishing system is filled in oil-filled transformer oil extraction of the present invention.As can be seen from above-mentioned implementation process, present invention achieves and adopt the constant-temperature valve gate control transformer oil extraction be built in insulating oil to fill nitrogen operation, only alarm signal early warning is used for passing into nitrogen in advance in nitrogen blanketing valve road, eliminate fire detector and the harm brought reported by mistake by Buchholz relay, thus provide an operable switch board in a kind of industry to fill nitrogen fire extinguishing system to the combined imputation type oil extraction that multiple oil-filled transformer carries out extinguishing operation; The invention also achieves the point higher according to disaster hidden-trouble occurrence probability, arranging targeted specifically and fill nitrogen arm, thus disaster hidden-trouble can be reduced fast, gaining time for thoroughly eliminating disaster hidden-trouble; The invention also achieves and adopt nitrogen cylinder or at least two nitrogen cylinders being coupled together by header as Nitrogen source gases 7, effectively can reduce Nitrogen source gases construction cost and the use cost of the transformer station in remote area.
Nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention, adopt combined imputation type oil extraction of the present invention to fill nitrogen fire extinguishing system to carry out oil extraction to oil-filled transformer and fill nitrogen extinguishing operation, comprise the control of nitrogen storage storage, warning oil extraction preliminary filling nitrogen, temperature control fill nitrogen three steps, detailed process is as follows:
Step 1, nitrogen storage tolerance control: need oil extraction to fill in the oil-filled transformer of nitrogen flame failure protection with all, the nitrogen amount that maximum that oil-filled transformer of oil conservater 12 capacity once fills nitrogen fire extinguishing calculates a reference value as nitrogen storage gauge, this nitrogen storage gauge is calculated a reference value and take advantage of 2 as the nitrogen gross reserves of Nitrogen source gases 7, be filled with the nitrogen of this nitrogen gross reserves by nitrogen charging device to Nitrogen source gases 7; The computing formula that nitrogen storage gauge calculates a reference value is:
V＝K*S*Q*T
Wherein, V is that nitrogen storage gauge calculates a reference value, and K is the safety coefficient of maximum that oil-filled transformer of oil conservater 12 capacity, and the span of K is 1.05 ~ 1.30; S is the horizontal projected area of maximum that oil-filled transformer of oil conservater 12 capacity; Q be maximum that oil-filled transformer of 8 pairs, nitrogen blanketing valve road oil conservater 12 capacity fill nitrogen fire extinguishing fill nitrogen intensity, be also the nitrogen amount that unit projection area passes through within the unit interval; T is the duration that oil conservater 12 capacity maximum that oil-filled transformer in 8 pairs, nitrogen blanketing valve road fills nitrogen fire extinguishing.
During enforcement, if adopt nitrogen gas cylinder group as Nitrogen source gases 7, then directly add the nitrogen gas cylinder of respective numbers as Nitrogen source gases 7.By being arranged on high-pressure manometer and switch board 11 on Nitrogen source gases 7 export pipeline, implement the gas-storing capacity understanding Nitrogen source gases 7, when Nitrogen source gases 7 is not enough, can by increasing new nitrogen gas cylinder, also once can change all nitrogen gas cylinders, guarantee that Nitrogen source gases 7 has the gas-storing capacity of reply needed for fire.
This step is controlled by nitrogen storage tolerance; both be conducive to reducing nitrogen use cost in the transformer station of remoteness; also be conducive to carrying out after an oil extraction fills nitrogen extinguishing operation; Nitrogen source gases 7 still stores the nitrogen of enough tackling a main transformer fire; thus run under the state making the oil-filled transformer of transformer station fill the protection of nitrogen fire extinguishing system all the time in oil extraction, greatly reduce the operations risks of transformer station.
Step 2, pre-oil extraction of reporting to the police fill nitrogen: distribute an address code on switch board 11 each oil-filled transformer, after switch board 11 receives the alarm signal of Buchholz relay 3 or fire detector 10, judge alarm signal is from which oil-filled transformer, and recall oil extraction time of carrying out needed for this oil-filled transformer and needed for the nitrogen amount that passes into, the oil extraction control valve 6 of the oil draining system of this oil-filled transformer of switch board 11 is opened, discharge the insulating oil in this transformer oil storage 12, meanwhile, the flow control valve 2 between conservator 1 and oil conservater 12 is closed automatically; When insulating oil drain time reaches scheduled duration, this transformer of switch board 11 instruction the nitrogen control valve 9 that fills of transformer Nitrogen filling system open, in nitrogen blanketing valve road 8, pass into the nitrogen of setting pressure and flow.
During enforcement, Buchholz relay 3, fire detector 10, the oil extraction control valve 6 of the corresponding oil-filled transformer of control logic of switch board 11 and fill nitrogen control valve 9, switch board 11 distributes an address code to each oil-filled transformer, by this address code, switch board 11 just can judge alarm signal is from which oil-filled transformer, the oil extraction control valve 6 controlling which oil-filled transformer is needed to open, how long the oil extraction time is, need the nitrogen control valve 9 that fills controlling which oil-filled transformer to open, it is how many for filling nitrogen quantity.
This step distributes an address code by giving each oil-filled transformer on switch board 11, realize the location to alarm signal, oil extraction control valve 6 oil extraction is precisely controlled for alarm signal, control to fill nitrogen control valve 9 and pass into nitrogen in advance to the nitrogen blanketing valve road 8 of corresponding transformer, in oil conservater 12, pass into nitrogen prepare for follow-up.
Step 3, temperature control fill nitrogen: when the insulating oil temperature in oil storage tank of oil immersed transformer 12 reaches predetermined temperature, constant temperature valve 803 is opened, and is filled with nitrogen by nitrogen blanketing valve road 8 in Oil Tank 12, carry out filling nitrogen fire extinguishing.
During enforcement, be immersed in the valve body of constant temperature valve 803 in oil conservater 12 insulating oil and the temperature of insulating oil is consistent.When insulating oil temperature rises to the open temp of constant temperature valve 803, constant temperature valve 803 is opened, nitrogen enters in oil conservater 12, spring up to insulating oil top from bottom insulating oil with intensive bubble form, the nitrogen sprung up causes the upper and lower oil reservoir in oil conservater 12 to stir mixing, contact oil surface temperature with air to decline fast, when nitrogen rises to insulating oil top, blanket of nitrogen is formed on insulating oil top, by the oxygen gases separated in insulating oil and air, effectively fire-retardant, disaster hidden-trouble is eliminated in A-stage.
This step responds to the temperature of insulating oil by the constant temperature valve 803 be built in oil conservater 12 insulating oil, controls nitrogen blanketing valve road 8 be filled with nitrogen by the unlatching of constant temperature valve 803 in oil conservater 12, carries out filling nitrogen fire extinguishing.Control nitrogen blanketing valve road 8 relative to prior art based on alarm signal and be filled with nitrogen in oil conservater 12, carry out filling nitrogen fire extinguishing, the method specific aim of this step is stronger, and accuracy rate is higher, and practicality is stronger.
Oil extraction is filled after nitrogen operation completes, and also have high pressure nitrogen in nitrogen blanketing valve road 8 between constant temperature valve 803 and one-way throttle valve 801, high pressure nitrogen longer-term persistence, on this part nitrogen blanketing valve road 8, can have influence on the service life of constant temperature valve 803 and choke valve 801.
In order to discharge the nitrogen remained in nitrogen blanketing valve road in time, reducing residual nitrogen to the harmful effect of transformer Nitrogen filling system, also comprising step 4 after step 3, be specially:
Get rid of residual nitrogen in nitrogen blanketing valve road: air bleeding valve 802 is set on the nitrogen blanketing valve road 8 between the one-way throttle valve 801 and transformer of the transformer Nitrogen filling system of each transformer, when constant temperature valve 803 is closed, oil extraction is filled after nitrogen operation completes, open air bleeding valve 802, the nitrogen discharge remained in nitrogen blanketing valve road is fallen.
During enforcement, because the diameter on nitrogen blanketing valve road 8 usually can not more than DN25, and length is generally no more than 15 meters, remain in the nitrogen in nitrogen blanketing valve road, very little relative to the gas-storing capacity of Nitrogen source gases 7, it directly emitted, the gas-storing capacity loss of Nitrogen source gases 7 is negligible, nitrogen is as the main component in air simultaneously, is directly discharged in air and can not causes environmental pollution.
It is more than the implementation process that nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention.As can be seen from above-mentioned implementation process, present invention achieves and fill nitrogen extinguishing operation based on the control of insulating oil temperature in oil conservater 12, avoid the serious harm that prior art alarm signal is brought.See on the whole, nitrogen extinguishing method is filled in combined imputation type oil extraction of the present invention, and specific aim is stronger, accuracy rate is higher, stability is higher, can eliminate in A-stage by the disaster hidden-trouble in oil conservater in time, changes existing combined imputation type oil extraction and fills the situation that nitrogen extinguishing method does not have industrial applicability.
Claims (6)
1. nitrogen fire extinguishing system is filled in combined imputation type oil extraction, comprise Nitrogen source gases (7), switch board (11), be arranged on the fire detector (10) of each transformer top, be arranged on the transformer oil storage control system of the band Buchholz relay (3) on each transformer, be with the transformer oil draining system of oil extraction control valve (6), be with the transformer Nitrogen filling system filling nitrogen control valve (9), the described transformer Nitrogen filling system of each transformer is all connected with Nitrogen source gases (7), described fire detector (10), Buchholz relay (3), the oil extraction control valve (6) of each transformer, fill nitrogen control valve (9) and be all electrically connected with switch board (11), it is characterized in that, the Nitrogen filling system of each transformer also comprises one-way throttle valve (801), nitrogen blanketing valve road (8), constant temperature valve (803), the source of the gas link of described nitrogen blanketing valve road (8) is connected with Nitrogen source gases (7), the oil conservater link of described nitrogen blanketing valve road (8) extends in oil conservater (12) through the transformer wall body of oil conservater (12) following side, described constant temperature valve (803) is arranged on the nitrogen blanketing valve road (8) in oil conservater (12), described one-way throttle valve (801) is arranged on the nitrogen blanketing valve road (8) filled between nitrogen control valve (9) and transformer.
2. nitrogen fire extinguishing system is filled in combined imputation type oil extraction according to claim 1, it is characterized in that, the described nitrogen blanketing valve road (8) of the transformer Nitrogen filling system of each transformer becomes at least two at corresponding transformer external shunt and fills nitrogen arm, filling nitrogen arm described in every root all extends in oil conservater (12) through the transformer wall body of oil conservater (12) following side, fills on nitrogen arm and be provided with constant temperature valve (803) described in the every root in oil conservater (12).
3. nitrogen fire extinguishing system is filled in combined imputation type oil extraction according to claim 1 and 2, it is characterized in that, described Nitrogen source gases (7) comprises nitrogen cylinder group and header, described nitrogen cylinder group comprises at least two nitrogen cylinders, described header comprises gas transmission supervisor and parallel at least two arms that conflux be arranged on gas transmission supervisor, the arm that confluxes described in each is responsible for gas transmission and is connected, the gas outlet of each described nitrogen cylinder is corresponding with the arm that confluxes of header to be communicated with, and described gas transmission supervisor is connected with nitrogen blanketing valve road (8).
4. nitrogen fire extinguishing system is filled in combined imputation type oil extraction according to claim 1 and 2, it is characterized in that, the transformer Nitrogen filling system of each transformer also comprises air bleeding valve (802), and described air bleeding valve (802) is arranged on the nitrogen blanketing valve road (8) between the one-way throttle valve (801) of corresponding transformer Nitrogen filling system and transformer.
5. nitrogen extinguishing method is filled in combined imputation type oil extraction, it is characterized in that, adopts combined imputation type oil extraction according to claim 1 to fill nitrogen fire extinguishing system and carries out oil extraction to oil-filled transformer and fill nitrogen extinguishing operation, comprise the following steps:
Step 1, nitrogen storage tolerance control: need oil extraction to fill in the oil-filled transformer of nitrogen flame failure protection with all, the nitrogen amount that maximum that oil-filled transformer of oil conservater capacity once fills nitrogen fire extinguishing calculates a reference value as nitrogen storage gauge, this nitrogen storage gauge is calculated a reference value and take advantage of 2 as the nitrogen gross reserves of Nitrogen source gases, be filled with the nitrogen of this nitrogen gross reserves by nitrogen charging device to Nitrogen source gases; The computing formula that nitrogen storage gauge calculates a reference value is:
V＝K*S*Q*T
Wherein, V is that nitrogen storage gauge calculates a reference value, and K is the safety coefficient of maximum that oil-filled transformer of oil conservater capacity, and the span of K is 1.05 ~ 1.30; S is the horizontal projected area of maximum that oil-filled transformer of oil conservater capacity; To be nitrogen blanketing valve road fill nitrogen fire extinguishing to that oil-filled transformer that oil conservater capacity is maximum to Q fills nitrogen intensity, is also the nitrogen amount that unit projection area passes through within the unit interval; T is that the duration of nitrogen fire extinguishing is filled to that oil-filled transformer that oil conservater capacity is maximum in nitrogen blanketing valve road;
Step 2, pre-oil extraction of reporting to the police fill nitrogen: distribute an address code on switch board each oil-filled transformer, after switch board receives the alarm signal of Buchholz relay or fire detector, judge alarm signal is from which oil-filled transformer, and recall oil extraction time of carrying out needed for this oil-filled transformer and needed for the nitrogen amount that passes into, the oil extraction control valve of the oil draining system of this oil-filled transformer of switch board is opened, discharge the insulating oil in this transformer oil storage, meanwhile, the flow control valve between conservator and oil conservater is closed automatically; When insulating oil drain time reaches scheduled duration, the nitrogen control valve that fills of the transformer Nitrogen filling system of this transformer of switch board instruction is opened, and passes into the nitrogen of setting pressure and flow in nitrogen blanketing valve road;
Step 3, temperature control fill nitrogen fire extinguishing: when the insulating oil temperature in oil storage tank of oil immersed transformer reaches predetermined temperature, constant temperature valve opening, by being filled with nitrogen in nitrogen blanketing valve road direction Oil Tank, carry out filling nitrogen fire extinguishing.
6. nitrogen fire extinguishing system is filled in combined imputation type oil extraction according to claim 5, it is characterized in that, also comprises the residual nitrogen got rid of in nitrogen blanketing valve road after step 3:
Nitrogen blanketing valve road between the one-way throttle valve and transformer of the transformer Nitrogen filling system of each transformer arranges air bleeding valve, and when constant temperature valve closing, oil extraction is filled after nitrogen operation completes, and opens air bleeding valve, is fallen by the nitrogen discharge remained in nitrogen blanketing valve road.
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| CN108281894A (en) * | 2018-03-22 | 2018-07-13 | 中国能源建设集团云南省电力设计院有限公司 | Fire alarm and coordinated control system inside and outside a kind of transformer sleeper fire |
| CN111403153A (en) * | 2020-03-17 | 2020-07-10 | 山东电力设备有限公司 | Transformer oil conservator rapid cut-off and oil discharge device, control system and method |
| CN111710503A (en) * | 2020-07-07 | 2020-09-25 | 国网安徽省电力有限公司电力科学研究院 | Extra-high voltage converter variable force oil discharging and nitrogen injecting device, control system and method |
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