CN212411789U - Extra-high voltage current conversion emergency oil discharge nitrogen injection device and control system - Google Patents
Extra-high voltage current conversion emergency oil discharge nitrogen injection device and control system Download PDFInfo
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Abstract
An extra-high voltage converter transformer emergency oil discharge and nitrogen injection device and a control system belong to the field of extra-high voltage converter transformer emergency oil discharge and comprise a body tee joint, a stop valve, a body oil tank oil discharge device, an oil storage cabinet oil discharge device, a nitrogen injection device and an accident oil pool; the body tee joint is arranged between the upper part of a body oil tank and the bottom of an oil conservator, a first port of the body tee joint is connected with the bottom of the oil conservator through a pipeline, a second port of the body tee joint is connected with an oil discharging device of the oil conservator through a pipeline, a third port of the body tee joint is provided with a stop valve, an output port of the stop valve is connected with the body oil tank through a pipeline, the oil discharging device of the body oil tank is connected with the bottom of the body oil tank through a pipeline, and output ends of the oil discharging device of the body oil tank and the oil discharging device of the; the main body oil tank is provided with an inflation inlet connected with a nitrogen injection device; the inside oil of body oil tank and oil conservator is discharged to quick safe and reliable ground when initial stage conflagration takes place, avoids the air admission body oil tank to lead to the intensity of a fire to stretch.
Description
Technical Field
The utility model belongs to extra-high voltage current conversion emergency oil extraction field, concretely relates to extra-high voltage current conversion emergency oil extraction nitrogen injection device, control system.
Background
The ultra-high voltage is a voltage grade of 1000 kilovolts of alternating current or more and 800 kilovolts of direct current or more, and the ultra-high voltage transmission is mainly characterized by high voltage, large transmission capacity and narrow line corridor and is suitable for high-power and long-distance transmission.
The converter station is a system for performing mutual energy conversion between direct current and alternating current in an extra-high voltage transmission project, and comprises the following equipment except equipment such as an alternating current field and the like which are the same as an alternating current transformer substation: a current converter, a converter transformer, an AC/DC filter, reactive power compensation equipment, a smoothing reactor and the like.
The converter transformer is a key device which is vital in an extra-high voltage transmission project, is a core device of interfaces at both ends of rectification and inversion in an alternating current and direct current transmission system, and belongs to an oil-immersed transformer. The transformer oil filled in the oil tank of the oil-immersed transformer is hydrocarbon liquid mixture which is extracted from crude oil and mainly contains naphthenic base, and is generally divided into-25 (condensation point) number transformer oil and-45 number transformer oil, and is commonly used as-25 number transformer oil. The initial boiling point of the transformer oil is more than 300 ℃, the flash point of the transformer oil is more than 140 ℃ when the transformer oil leaves a factory, and after the transformer oil is filled into a transformer and works for a long time, a small amount of hydrogen and light hydrocarbon can be generated due to local high-temperature and high-voltage cracking, so that gaseous combustible substances are mixed in a gas phase space.
By induction and analysis of a plurality of oil immersed transformer fire cases at home and abroad, the fire modes of the oil immersed transformer can be divided into three categories: the fire disaster of the root part of the insulator, the fire disaster of the partial oil tank and the fire disaster of the whole oil tank at the initial stage. The fire mainly breaks out at the root of the insulator in the initial stage, the fire mainly breaks out at the root of the insulator in the local oil tank, and the fire is rarely broken out in the whole oil tank.
Because the gas-phase space in the insulator is most prone to generate electric sparks, and the insulator is the weakest part of the oil-immersed transformer, the initial fire of the oil-immersed transformer is often expressed as explosion and ignition at the root of the insulator. When the oil immersed transformer oil is on fire, the oil product is mostly at a higher temperature, and when the fire extinguishing system acts, the oil product is usually burnt for a certain time, so that the metal structure is heated to a higher temperature. Therefore, the main characteristic of the oil immersed transformer fire is the combined action of oil fire and a high-temperature metal structure.
The converter transformer used in the field of extra-high voltage transmission contains a large amount of transformer oil, the oil storage amount in an extra-high voltage converter transformer body oil tank in China is about 130-200 tons, the oil storage amount of an oil storage cabinet is generally 10-30 tons, most types are Kunlun KI50X, and the oil storage cabinet is communicated with the body oil tank through a valve, so that the oil storage amount in the whole converter transformer is about 140-230 tons. When the root of the network side bushing insulator explodes and fires, secondary damage to an extra-high voltage converter transformer body oil tank can be caused, a gap is exploded on the converter transformer body oil tank, a large amount of transformer oil overflows through the transformer gap under the action of gravity, flows over the complex surface of the transformer and is partially ignited, complex vertical flowing is formed, continuous fuel supply is provided for an external fire source of the transformer to generate continuous combustion, meanwhile, the ignited transformer oil fire outside has a heating effect on the transformer body, the oil temperature inside the transformer is increased, the transformer oil expands due to thermal expansion and cold contraction, the externally leaked oil quantity is further increased, the fire is further deteriorated and out of control, and the transformer oil is almost not covered by a fire extinguishing agent, and the transformer oil tank is one of the root causes that the fire of the converter transformer for extra-high voltage transmission is difficult to extinguish.
Therefore, when a fire accident happens to the ultra-high voltage converter transformer, how to discharge a large amount of transformer oil in the converter transformer to the accident oil pool is very necessary, so that the possibility of out-of-control fire is reduced, the fire fighting difficulty is weakened, and the fire fighting success rate is improved.
In the prior art, the application publication date is 2018, 11 and 13, and the application publication number is CN108806932A, which is a chinese patent application entitled "high-temperature flame-retardant combined valve control system for an emergency oil discharge pipeline of an extra-high voltage transformer", and discloses a high-temperature flame-retardant combined valve control system for an emergency oil discharge pipeline of an extra-high voltage transformer.
The above-mentioned chinese patent application has the following disadvantages:
(1) the oil storage cabinet and the body oil tank jointly adopt a set of oil discharge system, because the converter transformer body oil tank discharges oil forcibly, a certain pressure exists in an oil discharge pipeline, and the oil in the oil storage cabinet is realized by the natural pressure of the height of an oil surface, if the oil discharge of the oil storage cabinet is connected with the oil discharge pipeline of the transformer body, the oil discharge time of the oil storage cabinet is too long, or the oil in the oil storage cabinet cannot be discharged at all due to the pressure effect;
(2) fire retardation design is only carried out on the accumulated oil discharging pool to the accident oil pool, and fire retardation design is not carried out on the whole system, so that flame can enter an evacuated oil pipe together with a large amount of unburned combustible steam and air which is not premixed and reacted in the oil discharging process, and the fire can spread in the oil pipe;
(3) all valves are designed in series, the reliability of the system is not high, and if a single valve fails to open, the system cannot discharge oil.
When oil is discharged in an emergency mode, along with the reduction of the oil level of the converter transformer body oil tank, air outside the converter transformer body oil tank can blow into the converter transformer body oil tank from a transformer gap, and fire can spread inside the converter transformer body oil tank due to the fact that the air enters the emptied converter transformer body oil tank; in the prior art, a mode of injecting nitrogen into the converter transformer body oil tank is adopted while oil is discharged from the converter transformer body oil tank, so that the problem is solved, the fire extinguishing efficiency is high, the non-afterburning fire extinguishing time is less than 2min, the fire extinguishing time is only 22s during testing, the continuous nitrogen charging time is more than 30min, and the temperature of the oil tank can be reduced to be below 0 ℃; compared with a foam spray fire extinguishing device, the device does not need to build a fire room and a spray pipe network. The foam tank and the nitrogen cylinder group have large volume and high cost, and the disassembly of the transformer is influenced when the spraying pipe network is overhauled. The foam fire extinguishing agent has long service life, no timeliness of the nitrogen fire extinguishing agent and low cost.
Experimental research shows that if the insulation ignited inside the transformer is cooled without the protection of nitrogen, the transformer oil can still be radiated to form combustion, so that the oil inside the transformer is re-combusted, the injected nitrogen plays a role in controlling the combustion of the transformer oil inside, and when the flow of the injected nitrogen is larger than the loss flow of the outlet of the base opening of the sleeve of the transformer, the combustion of the transformer oil inside can be completely choked (when oil discharge stops, the oil level of the residual transformer is about one third of the original liquid level).
For example, in the prior art, a chinese patent of "combined distribution type oil discharge and nitrogen charge fire extinguishing system and fire extinguishing method" with an authorization notice number of CN104721992B and an authorization notice date of 2017, 6 and 9 discloses a combined distribution type oil discharge and nitrogen charge fire extinguishing system, which comprises a nitrogen gas source, a control cabinet, a fire detector arranged at the top of each transformer, a transformer oil storage control system with a gas relay, a transformer oil discharge system with an oil discharge control valve, and a transformer nitrogen charge system with a nitrogen charge control valve, which are arranged on each transformer, wherein the transformer nitrogen charge system is communicated with the nitrogen gas source; the fire detector, the gas relay, the oil discharge control valve and the nitrogen charging control valve are all electrically connected with the control cabinet; the nitrogen charging system further comprises a one-way throttle valve, a nitrogen charging pipeline and a constant temperature valve, the nitrogen charging pipeline is communicated with a nitrogen gas source, the nitrogen charging pipeline penetrates through the transformer wall body on the lower side portion of the oil storage cabinet and extends into the oil storage cabinet, the constant temperature valve is arranged on the nitrogen charging pipeline in the oil storage cabinet, and the one-way throttle valve is arranged on the nitrogen charging pipeline between the nitrogen charging control valve and the transformer.
Although the Chinese invention patent solves the technical problems that after a fire detector and a gas relay are used for a period of time, the false alarm rate is increased along with the increase of the service time, the false alarm can cause the malfunction of an oil discharge and nitrogen charging device, so that a main transformer trips, and a large-area sudden power failure accident is caused. However, the above-mentioned chinese patent has the following disadvantages in addition to the disadvantages of the above-mentioned "high temperature flame retardant combined valve control system for extra-high voltage transformer accident oil discharge pipeline": nitrogen is injected from the bottom of the oil tank of the converter transformer body, so that the fire extinguishing effect is poor.
Therefore, when an initial fire of the ultrahigh voltage converter transformer occurs, how to quickly, safely and reliably discharge a large amount of transformer oil in the main oil tank and the oil conservator and prevent air outside the main oil tank of the converter transformer from leaking into the main oil tank of the converter transformer from a gap of the transformer is a problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that solve lies in how when extra-high voltage converter transformer initial stage conflagration takes place, how quick, safe, the inside a large amount of transformer oil of body oil tank and the oil conservator of discharging reliably and prevent that the outside air of converter transformer body oil tank can follow the transformer breach and scurry into converter transformer body oil tank.
The utility model discloses a solve above-mentioned technical problem through following technical scheme.
The extra-high voltage current conversion emergency oil discharge and nitrogen injection device is used for oil discharge of a current conversion main oil tank (1) and an oil storage cabinet (10), and comprises a main body tee joint (11), a stop valve (12), a main oil tank oil discharge device, an oil storage cabinet oil discharge device, a plurality of nitrogen injection devices and an accident oil pool; the oil tank is characterized in that the body tee joint (11) is arranged between the upper part of the body oil tank (1) and the bottom of the oil conservator (10), a first port of the body tee joint (11) is connected with the bottom of the oil conservator through a pipeline, a second port of the body tee joint is connected with an oil discharging device of the oil conservator through a pipeline, a cut-off valve (12) is arranged at a third port of the body tee joint, an output port of the cut-off valve (12) is connected with the body oil tank (1) through a pipeline, the oil discharging device of the body oil tank is connected to the bottom of the body oil tank (1) through a pipeline, and output ends of the oil discharging device of the body oil tank and the oil discharging device of; a plurality of inflation ports are formed in the upper middle parts of the two sides of the main body oil tank (1), and the plurality of nitrogen injection devices are connected with the plurality of inflation ports; when discharging oil, the cut-off valve (12) is closed to cut off the oil supply pipeline of the oil storage cabinet (10) to the body oil tank (1), the body oil tank oil discharging device and the oil storage cabinet oil discharging device respectively and independently discharge oil to the accident oil pool, and meanwhile, a plurality of nitrogen injection devices inject nitrogen into the body oil tank (1).
Extra-high voltage change of current becomes emergent oil extraction device when receiving row oil actuating signal, close the cutoff valve, cut off the oil storage cabinet to the flame retardant type spark arrester oil drain pipe of body oil tank, body oil tank and oil storage cabinet adopt one set of independent oil extraction of oil extraction system respectively, the oil of oil storage cabinet no longer gets into the body oil tank, the oil extraction time shortens greatly, in emergent oil extraction, nitrogen injection device fills into nitrogen gas in to the body oil tank, avoid the change of current of the entering evacuation of air to become the body oil tank situation and lead to the intensity of a fire at the inside stretching of change of current change body oil tank.
As the utility model discloses technical scheme's further improvement, body oil tank oil extraction device include that maintenance valve (2), first oil flowmeter (3), the first dualization are prepared electronic valves (4), a plurality of body oil tank and are revealed alarm instrument (5), a plurality of body oil tank butterfly valve (6), body oil tank (1), maintenance valve (2), first oil flowmeter (3), the first dualization is prepared electronic valves (4), a plurality of body oil tank and is revealed alarm instrument (5), a plurality of body oil tank butterfly valve (6) and loop through the pipeline along x axle negative direction and be connected with the accident oil bath.
As the utility model discloses technical scheme's further improvement, oil conservator oil extraction device include that the dualization of second prepares electronic valves (13), second oil flowmeter (14), alarm instrument (15), a plurality of oil conservator butterfly valve (16) are revealed to a plurality of oil conservators, the dualization of second prepare electronic valves (13), second oil flowmeter (14), a plurality of oil conservators reveal alarm instrument (15), a plurality of oil conservator butterfly valve (16) loop through the pipeline along y axle burden direction and are connected with the accident oil bath.
As the utility model discloses technical scheme's further improvement, the notes nitrogen device include a plurality of nitrogen gas bottle group (21), converge pneumatic valve (22), gas injection pipeline (23), control valve (24), nitrogen gas filling opening (25), a plurality of nitrogen gas bottle group (21) be connected with the one end of gas injection pipeline (23) through converging pneumatic valve (22), the other end and nitrogen gas filling opening (25) of gas injection pipeline (23) be connected, gas injection pipeline (23) and nitrogen gas filling opening (25) between set up control valve (24), nitrogen gas filling opening (25) be connected with the gas filling opening of body oil tank (1) both sides position on the upper side in the middle part.
As the further improvement of the technical proposal of the utility model, the number calculation formula of the nitrogen gas cylinder group (21) is as follows:
s＝V2/V1 (1)
wherein s is the number of nitrogen cylinders, P1Is the pressure of nitrogen gas in the main oil tank after nitrogen charging, P2Pressure of nitrogen in nitrogen cylinder, V1Is a single bottle of nitrogen gas at a pressure of P1Is filled into the volume, V, occupied in the body oil tank2The volume of the transformer oil in the oil tank body, phi is the diameter of the nitrogen cylinder, and h is the height of the nitrogen cylinder.
As the utility model discloses technical scheme's further improvement, first dualization prepare electrovalve group (4) including two normal close butterfly valves, two normal close butterfly valves connect in parallel back one end and pass through the pipeline to be connected with first oil flowmeter (3), the other end is revealed alarm instrument (5) through pipeline and body oil tank and is connected, the equal independent power supply of power return circuit and the control circuit of every normal close butterfly valve.
As the utility model discloses technical scheme's further improvement, the dualization of second prepare electrovalve group (13) including two normal close butterfly valves, two normal close butterfly valves connect in parallel back one end and pass through the pipeline to be connected with second oil flowmeter (14), the other end is through revealing alarm (15) with the oil conservator and be connected.
As a further improvement of the technical scheme of the utility model, the pipeline adopt the oil drain pipeline of the flame retardant type flame arrester.
A control system applied to the extra-high voltage commutation emergency oil discharging and nitrogen injecting device comprises an oil discharging control cabinet, a first control center and a second control center, wherein the oil discharging control cabinet is integrated with a first oil discharging control unit and a second oil discharging control unit; the oil discharge control cabinet is integrated with a first oil discharge control unit, a second oil discharge control unit and a nitrogen injection control unit; the first control center is respectively connected with the first oil discharge control unit, the second oil discharge control unit and the nitrogen injection control unit; the second control center is respectively connected with the first oil discharge control unit, the second oil discharge control unit and the nitrogen injection control unit; the first oil discharge control unit is respectively connected with the oil discharge device of the main oil tank, the oil discharge device of the oil conservator and the stop valve (12) in a hard wiring mode; the second oil discharge control unit is respectively connected with the oil discharge device of the main oil tank, the oil discharge device of the oil conservator and the stop valve (12) in a hard wiring mode; the nitrogen injection control unit is connected with the nitrogen injection device in a hard-wired mode.
As a further improvement of the technical solution of the present invention, the first control center or the second control center sends an oil discharge start signal, and the signal is simultaneously transmitted to the first oil discharge control unit, the second oil discharge control unit and the nitrogen injection control unit; the first oil discharge control unit transmits signals to the body oil discharge device, the oil storage cabinet oil discharge device and the stop valve (12) respectively; the second oil discharge control unit transmits signals to the oil discharge device of the body, the oil discharge device of the oil conservator and the stop valve (12) respectively; the nitrogen injection control unit sends a signal to the nitrogen injection device; and (3) controlling the cut-off valve (12) to be closed, opening the body oil discharging device, the oil storage cabinet oil discharging device and the nitrogen injection device, discharging the converter oil to the accident oil pool, and injecting nitrogen into the body oil tank (1).
As the utility model discloses technical scheme's further improvement, hard-wiring be high temperature resistant fire-retardant armor shielded cable.
As the utility model discloses technical scheme's further improvement, oil extraction start signal adopt long-range manual electric start mode.
The utility model has the advantages that:
(1) extra-high voltage change of current becomes emergent oil extraction device when receiving row oil actuating signal, close the cutoff valve, cut off the oil storage cabinet to the flame retardant type spark arrester oil drain pipe of body oil tank, body oil tank and oil storage cabinet adopt one set of independent oil extraction of oil extraction system respectively, the oil of oil storage cabinet no longer gets into the body oil tank, the oil extraction time shortens greatly, in emergent oil extraction, nitrogen injection device fills into nitrogen gas in to the body oil tank, avoid the change of current of the entering evacuation of air to become the body oil tank situation and lead to the intensity of a fire at the inside stretching of change of current change body oil tank.
(2) The electric valve group is successively opened in the dualization of body oil tank oil extraction device and oil conservator oil extraction device, carries out the oil extraction, even when single valve breaks down, the oil extraction system still can normally arrange oil, and the reliability is high.
(3) Adopt the oil drain pipe of flame retardant type spark arrester to effectually prevent that flame can get into the oil pipe of evacuation along with a large amount of combustible steam that unburnt and the air of not premixing reaction in the oil drain process, lead to the intensity of a fire to spread in oil pipe, the security is high.
(4) First oil extraction control unit, second oil extraction control unit and the first control center of dualization, second control center cross connection control body oil tank oil extraction device and the dualization of oil conservator oil extraction device through hard wiring configuration electric valve group, and two sets of oil extraction control units independently operate, do not divide the activestandby, prevent to cause the unable condition of starting dualization configuration electric valve group because one of them set of oil extraction control unit breaks down.
(5) The oil discharge starting signal adopts a remote manual electric starting mode, and when an oil discharge system needs to be started, an operator confirms the field condition and can start after double confirmation in a remote control screen or an operation box. Prevent the occurrence of false alarm, small-scale fire alarm and other interference signals, and prevent the huge loss caused by system malfunction.
(6) The oil discharge pipeline penetrates through the cobble layer and is directly introduced into the accident oil pool, and oil discharge tests prove that oil with fire cannot be injected into the accident oil pool.
(7) The monitoring loop of the converter transformer oil discharge system has powerful functions, and the monitoring signals comprise a power supply of the electric ball valve, a power failure control signal, an on/off state signal, an oil leakage signal of an oil discharge pipeline and the like, and are monitored in real time.
(8) The cable adopts fire-resistant cable and adds the design of fire prevention cover, and electric ball valve adopts the comprehensive protection of fire prevention cover, can guarantee still can open the oil extraction in a distant place after 1 hour of direct combustion.
Drawings
Fig. 1 is a structural diagram of an oil discharging device of a main body oil tank in an embodiment of the invention;
fig. 2 is a structural diagram of an oil discharge device of an oil conservator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a nitrogen injection apparatus according to an embodiment of the present invention;
fig. 4 is a block diagram of an emergency oil drainage and nitrogen injection system according to an embodiment of the present invention;
fig. 5 is a control system diagram of an emergency oil-discharging and nitrogen-injecting system according to an embodiment of the present invention;
fig. 6 is a logic diagram of the emergency oil discharge and nitrogen injection start signal generation according to the embodiment of the present invention;
fig. 7 is a starting process of the emergency oil discharging and nitrogen injecting system according to the embodiment of the present invention;
fig. 8 is a test effect diagram of the top nitrogen injection of the emergency oil drainage and nitrogen injection system according to the embodiment of the present invention;
fig. 9 is the utility model discloses emergent oil extraction nitrogen injection system bottom is annotated nitrogen's experimental effect picture.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further described below with reference to the drawings and specific embodiments of the specification:
examples
As shown in fig. 1-3, the extra-high voltage current conversion emergency oil discharge nitrogen injection device comprises a body oil tank 1, an overhaul valve 2, a first oil flow meter 3, a first duplex configuration electric valve bank 4, a plurality of body oil tank leakage alarm devices 5, a plurality of body oil tank butterfly valves 6, an accident oil pool, an oil conservator 10, a body tee joint 11, a cut-off valve 12, a second duplex configuration electric valve bank 13, a second oil flow meter 14, a plurality of oil conservator leakage alarm devices 15, a plurality of oil conservator butterfly valves 16 and a plurality of nitrogen injection devices.
The first port of body tee bend 11 pass through the flame retardant type spark arrester oil drain pipe and be connected with oil conservator 10, the second port passes through the flame retardant type spark arrester oil drain pipe and is connected with second dual configuration electric valve group 13, the third port delivery outlet sets up stop valve 12, the output port of stop valve 12 pass through the flame retardant type spark arrester oil drain pipe and be connected with body oil tank 1.
As shown in fig. 1, the body oil tank 1, the service valve 2, the first oil flow meter 3, the first dual-configuration electric valve bank 4, the leakage alarm instruments 5 of the plurality of body oil tanks and the butterfly valves 6 of the plurality of body oil tanks are connected with the accident oil pool sequentially through the oil discharge pipeline of the explosion-proof flame-retardant type flame arrester along the x-axis negative direction.
First dualization prepare electrovalve group 4 include two normal close butterfly valves, two parallelly connected back one end of normal close butterfly valves are passed through the type spark arrester oil drain pipe of flame retardant and are connected with first oil flowmeter 3, the other end is revealed alarm instrument 5 through type spark arrester oil drain pipe and body oil tank and is connected.
Preferably, 2 body oil tank leak alarm 5 and 2 body oil tank butterfly valves 6 pass through explosion-proof type spark arrester oil drain pipe cross connection along the negative direction of x axle.
As shown in fig. 2, the oil conservator 10, the body tee 11, the second dual-configuration electric valve bank 13, the second oil flow meter 14, the plurality of oil conservator leakage alarm devices 15 and the plurality of oil conservator butterfly valves 16 are connected with the emergency oil pool sequentially through the oil discharge pipeline of the explosion-proof flame retardant type flame arrester along the y-axis negative direction.
The second dual configuration electric valve group 13 include two normally closed butterfly valves, two parallelly connected back one end of normally closed butterfly valves are connected with second oil flow meter 14 through flame retardant type spark arrester oil drain pipe, the other end is revealed alarm instrument 15 through flame retardant type spark arrester oil drain pipe and oil conservator and is connected.
Preferably, the 2 oil conservator leakage alarm instruments 15 and the 2 oil conservator butterfly valves 16 are connected in a staggered mode along the x-axis negative direction through an anti-explosion type flame arrester oil drain pipeline.
The oil flow meter is used for monitoring the flow of the converter transformer oil in the oil discharge pipeline of the explosion-proof flame-retardant fire arrestor in real time.
After the control system sends a signal to the oil discharging device of the main oil tank and the oil discharging device of the oil conservator, the dual-configuration electric valve set is switched from normal close to normal open and enters an oil discharging mode; two normally closed butterfly valves of each dual configuration electric valve group respectively include 1 way independent power supply circuit and control circuit, and the power supply circuit power supply of every normally closed butterfly valve adopts 220V single phase alternating current power supply, gets respectively from the different generating line sections of station with AC system, and the control circuit control power supply of every normally closed butterfly valve is got respectively from station with 110V direct current 1 section and 2 sections, avoids one section direct current generating line decompression or direct current ground connection, leads to the condition that two normally closed butterfly valves can't normally work simultaneously.
The body oil tank leakage alarm 5 is used for monitoring whether leakage exists in an oil discharge pipeline of the anti-explosion flame-retardant type flame arrester in real time when the converter transformer normally operates or during emergency oil discharge.
The oil discharge pipeline of the explosion-proof flame arrester has the wall effect, the heat conduction effect and the flame arresting effect, and prevents flame from entering an evacuated oil pipe along with a large amount of unburnt combustible steam and non-premixed reaction air in the oil discharge process to cause the fire to spread in the oil pipe.
As shown in fig. 3, the nitrogen injection device includes a plurality of nitrogen bottle groups 21, a gas collecting valve 22, an air injection pipeline 23, a control valve 24, and a nitrogen injection port 25, wherein the plurality of nitrogen bottle groups 21 are connected to one end of the air injection pipeline 23 through the gas collecting valve 22, the other end of the air injection pipeline 23 is connected to the nitrogen injection port 25, and the control valve 24 is disposed between the air injection pipeline 23 and the nitrogen injection port 25.
A plurality of inflation ports are arranged at the upper positions of the middle parts of two sides of the main oil tank 1 of the converter transformer and at the position 500 mm-600 mm away from the top of the tank, and nitrogen injection ports 25 of the plurality of nitrogen injection devices are connected with the plurality of inflation ports at the upper positions of the middle parts of two sides of the main oil tank 1. The control valve 24 of the nitrogen injection device is normally closed in a normal state, after the oil is discharged from the body oil tank 1 of the converter transformer for a period of time, after the control system sends an instruction, the control valve 24 is normally opened to charge nitrogen, and the control system of the nitrogen injection device is integrated with the body oil discharge control system and the oil storage cabinet oil discharge control system.
The number calculation formula of the nitrogen cylinders of the nitrogen cylinder group 21 is as follows:
s＝V2/V1 (1)
wherein s is the number of nitrogen cylinders, P1Is the pressure of nitrogen gas in the main oil tank after nitrogen charging, P2Pressure of nitrogen in nitrogen cylinder, V1Is a single bottle of nitrogen gas at a pressure of P1Is filled into the volume, V, occupied in the body oil tank2The volume of the transformer oil in the oil tank body, phi is the diameter of the nitrogen cylinder, and h is the height of the nitrogen cylinder.
As shown in fig. 4, the extra-high voltage commutation emergency oil draining and nitrogen injecting system comprises a control system, a main oil tank oil draining device, an oil conservator oil draining device, a nitrogen injecting device and a stop valve 12, wherein the control system controls the starting and the closing of the main oil tank oil draining device, the oil conservator oil draining device, the nitrogen injecting device and the stop valve 12 according to an oil draining starting signal.
As shown in fig. 5, the control center a is in communication connection with the oil discharge control unit a and the oil discharge control unit B through IEC61850 respectively; the control center B is respectively in communication connection with the oil discharge control unit A and the oil discharge control unit B through IEC 61850; the oil discharge control unit A is respectively connected with a first dual-configuration electric valve group 4 of an oil discharge device of a main oil tank, a second dual-configuration electric valve group 13 of an oil discharge device of an oil conservator and a stop valve 12 in a hard wiring mode; the oil discharge control unit B is respectively connected with a first dual-configuration electric valve group 4 of an oil discharge device of the main oil tank, a second dual-configuration electric valve group 13 of an oil discharge device of the oil conservator and a stop valve 12 in a hard wiring mode; the nitrogen injection control unit is connected with a control valve 24 of the nitrogen injection device in a hard-wired mode.
The control center A or the control center B reports an invitation after eliminating interference conditions such as false alarm, small-scale fire alarm and the like according to field conditions, after comprehensive judgment and processing, the control center A or the control center B remotely and manually sends an oil discharge starting signal, the signal is simultaneously transmitted to an oil discharge control unit A, an oil discharge control unit B and a nitrogen injection control unit, and the oil discharge control unit A respectively transmits the signal to a first dual configuration electric valve group 4 of a body oil discharge device, a second dual configuration electric valve group 13 of an oil storage cabinet oil discharge device and a cut-off valve 12; meanwhile, the oil discharge control unit B respectively transmits signals to a first dual configuration electric valve group 4 of the oil discharge device of the body, a second dual configuration electric valve group 13 of the oil discharge device of the oil conservator and a stop valve 12; the nitrogen injection control unit transmits a signal to a control valve 24 of the nitrogen injection device; and (3) controlling the cut-off valve 12 to be closed, starting the first dual preparation electric valve group 4 and the second dual preparation electric valve group 13, discharging the conversion oil to an accident oil pool, and starting the control valve 24 to inject the nitrogen in the plurality of nitrogen cylinder groups 21 into the main oil tank 1.
Oil extraction control unit A, oil extraction control unit B and the control center A of dualization, control center B cross connection control body oil tank oil extraction device and the dualization of storing up oil tank oil extraction device through hard wiring, and two sets of oil extraction control unit independent operation do not divide the activestandby, prevent to cause the unable condition of starting dualization configuration electric valve because one of them set of oil extraction control unit breaks down.
The oil discharging device of the body oil tank and the oil discharging device of the oil conservator are respectively provided with a monitoring loop for monitoring a power supply power-off signal, a control power supply power-off signal, a valve opening/closing state signal and an oil discharging pipeline oil leakage signal of the doubly-prepared electric valve group.
As shown in fig. 6, the method for generating the oil-draining and nitrogen-injecting start signal includes the following steps:
1) the oil discharge control cabinet receives the heavy gas signal (two out of three), the fire alarm signal (at least two fire alarm signals) and the transformer power-off signal, and outputs the three signals after logical AND; the output logic 'AND' signal is sent to the control center A and the control center B.
2) And after comprehensive judgment processing, the control center A or the control center B remotely and manually sends an oil discharge starting signal to be transmitted to an oil discharge control cabinet.
The oil discharge starting signal adopts a remote manual electric starting mode, so that huge loss caused by system misoperation caused by interference signals such as false alarm, small-scale fire alarm and the like is prevented.
As shown in fig. 7, the starting processes of the oil discharging device of the main oil tank, the oil discharging device of the oil storage tank and the nitrogen injecting device of the extra-high voltage conversion emergency oil discharging and nitrogen injecting system are as follows: the control center A or the control center B powers on the system and sends an oil discharge starting signal to the oil discharge control cabinet, and at the moment, the oil discharge control cabinet controls the cut-off valve (12) to be closed, and a pipeline for supplying oil to the main oil tank (1) together with the oil storage cabinet (10) is cut off; after the oil discharging device of the body oil tank receives an oil discharging starting signal sent by an oil discharging control cabinet, the body oil tank (1) starts to discharge oil, and at the moment, the oil discharging control cabinet starts to time; after the time is counted for 10s in an accumulated mode, the oil discharge control cabinet sends an oil discharge starting signal to the oil discharge device of the oil conservator, and the oil drain device of the oil conservator starts to discharge oil after receiving the oil discharge starting signal; after the timing is accumulated for 15s, the oil discharge control cabinet sends a signal, the nitrogen injection device is started, and nitrogen gas is injected into the main oil tank (1); when the oil level of the main oil tank (1) of the converter transformer reaches the oil discharge end threshold value (the oil level gauge in the main oil tank of the converter transformer reaches the limit value), the oil discharge process of the oil discharge device of the main oil tank and the oil discharge device of the oil conservator is ended, the nitrogen injection device is closed at the same time, and the nitrogen injection process is ended.
Fig. 8 is the utility model discloses emergent oil extraction nitrogen injection system top is annotated nitrogen's experimental effect picture. And (3) adding 93# gasoline 5 liters into a base port of the transformer bushing to serve as combustion-supporting oil, starting to change the color and the concentration of rising smoke after igniting for about 1 minute, heating and evaporating the transformer oil by radiation to form oil gas for continuous combustion, reading the flame temperature of about 750 ℃ through a first thermocouple arranged on the liquid level of the transformer oil after 3 minutes, and approaching the flame temperature when the transformer oil is stably combusted, thereby judging that the transformer oil reaches a stable combustion state.
And (3) starting oil discharge in the 4 th minute, observing a flame burnt at the bottom port of the sleeve by a video provided by an unmanned aerial vehicle, entering the cavity of the transformer along with the falling of the liquid level, keeping the temperature of the thermocouple on the original liquid level stable by about 750 ℃, and simultaneously raising the temperature of the second thermocouple which is 480mm away from the original liquid level to about 700 ℃ from the oil temperature, so as to judge that the burnt flame enters the interior of the transformer along with the falling of the liquid level and continuously and stably burns (when the oil discharge is stopped, the oil level of the transformer is about three fifths of the original liquid level).
Inject nitrogen gas after the 5 th minute and begin to calculate, transformer bushing seat mouth position emits white smoke about 2 minutes back, explains that nitrogen gas begins to take effect this moment, observes bushing base mouth from unmanned aerial vehicle video, observes the inside flame of transformer and diminishes to judge that the nitrogen gas of injecting plays the control action to inside transformer oil burning.
After about 8 minutes of calculation from the beginning of nitrogen gas injection, the top flue gas of the transformer basically disappears, the rest is white smoke and slight temperature difference updraft, the inside is observed through the casing base mouth to the unmanned aerial vehicle video, flame can not be seen, the thermocouple temperature data returns to about 60 ℃, therefore, the inside naked light of the transformer is judged to be extinguished.
And after the nitrogen is injected for about 15 minutes, closing the nitrogen pipeline valve to stop injecting the nitrogen into the transformer, observing the inside of the transformer through the video of the unmanned aerial vehicle, and keeping the temperature data of the thermocouple on the liquid surface at about 60 ℃, so that the situation that the inside of the transformer is smoldered is judged, and the re-combustion is not generated.
Fig. 9 is the utility model discloses emergent oil extraction nitrogen injection system bottom is annotated nitrogen's experimental effect picture. Adding 93# gasoline 5 liters as combustion-supporting oil into a base port of a transformer bushing, burning the gasoline limited in the area range of the base port of the transformer bushing in the initial stage of igniting the gasoline, gradually changing the rising smoke from black smoke to light black smoke after about 1 minute, judging that the combustion-supporting gasoline is completely burnt, evaporating the transformer oil by radiation heating to form oil gas for continuous combustion, reading the flame temperature of about 780 ℃ through a first thermocouple arranged on the liquid level of the transformer oil after 3 minutes, and approaching the flame temperature when the transformer oil is stably burnt, thereby judging that the transformer oil reaches a stable burning state.
After oil discharge starts, the liquid level of transformer oil descends, flame combustion in a base port of a sleeve is observed by a video provided by an unmanned aerial vehicle, the temperature of a first thermocouple is kept stable at about 780 ℃, meanwhile, a second thermocouple which is 480mm away from the original liquid level rises from the oil temperature to the temperature close to the flame at about 550 ℃, and therefore it is judged that the burning flame enters the transformer along with the descending of the liquid level and continuously and stably burns.
The calculation is started after the nitrogen is injected after the 5 th minute, white smoke is emitted from the position of the sleeve seat opening of the transformer after about 3 minutes, the situation that the nitrogen is floated and filled in the ignition position of the upper cavity of the transformer at the moment is shown, part of the nitrogen emits from the ignition opening along with the smoke, the flame inside the transformer is observed to be reduced by observing the sleeve seat opening from the video of the unmanned aerial vehicle, and therefore the injected nitrogen is judged to play a control role in the combustion of the transformer oil inside, but the residual transformer oil level is about one third of the original liquid level when the oil discharge stops because the flow of the injected nitrogen is smaller than the loss flow of the outlet of the sleeve seat opening of the transformer.
After about 15 minutes of calculation from the beginning of nitrogen injection, the top flue gas of the transformer basically disappears, the rest is white smoke and slight temperature difference updraft, the inside is observed through a sleeve base opening in the video of the unmanned aerial vehicle, flame cannot be seen, the temperature data of the thermocouple returns to about 200 ℃, the flame without combustion in the inside is indicated, and therefore it is judged that the open flame in the transformer is extinguished, but the insulation part of the transformer winding is burned and carbonized, and then is internally smoldered.
After about 15 minutes from the beginning of the calculation of injecting nitrogen gas, close nitrogen gas pipeline valve and stop injecting nitrogen gas to transformer inside, the sleeve pipe base mouth at transformer top begins to emit black cigarette after about 10 minutes, observe the transformer inside through the unmanned aerial vehicle video, can see the flame of partial burning, thermocouple temperature data returns to about 300 ℃, judge from this that the insulator of the inside smoldering of transformer is cooling at the protection that does not have nitrogen gas this moment, still can radiate transformer oil and form the burning, cause the after combustion of the inside oil of transformer.
From the experimental results of fig. 8 and 9, it can be seen that: the nitrogen injection contributes to the reduction of internal fire, the degree of the nitrogen injection depends on the speed of the nitrogen injection, and the nitrogen injection effect at the top of the transformer is better than that at the bottom.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (12)
1. The ultra-high voltage current conversion emergency oil discharge and nitrogen injection device is used for oil discharge of a current conversion main body oil tank (1) and an oil storage cabinet (10), and is characterized by comprising a main body tee joint (11), a stop valve (12), a main body oil tank oil discharge device, an oil storage cabinet oil discharge device, a plurality of nitrogen injection devices and an accident oil pool; the oil tank is characterized in that the body tee joint (11) is arranged between the upper part of the body oil tank (1) and the bottom of the oil conservator (10), a first port of the body tee joint (11) is connected with the bottom of the oil conservator through a pipeline, a second port of the body tee joint is connected with an oil discharging device of the oil conservator through a pipeline, a cut-off valve (12) is arranged at a third port of the body tee joint, an output port of the cut-off valve (12) is connected with the body oil tank (1) through a pipeline, the oil discharging device of the body oil tank is connected to the bottom of the body oil tank (1) through a pipeline, and output ends of the oil discharging device of the body oil tank and the oil discharging device of; a plurality of inflation ports are formed in the upper middle parts of the two sides of the main body oil tank (1), and the plurality of nitrogen injection devices are connected with the plurality of inflation ports; when discharging oil, the cut-off valve (12) is closed to cut off the oil supply pipeline of the oil storage cabinet (10) to the body oil tank (1), the body oil tank oil discharging device and the oil storage cabinet oil discharging device respectively and independently discharge oil to the accident oil pool, and meanwhile, a plurality of nitrogen injection devices inject nitrogen into the body oil tank (1).
2. The extra-high voltage converter transformer emergency oil discharging and nitrogen injecting device according to claim 1, wherein the main body oil tank oil discharging device comprises a maintenance valve (2), a first oil flow meter (3), a first duplex configuration electric valve group (4), a plurality of main body oil tank leakage alarm instruments (5) and a plurality of main body oil tank butterfly valves (6), and the main body oil tank (1), the maintenance valve (2), the first oil flow meter (3), the first duplex configuration electric valve group (4), the plurality of main body oil tank leakage alarm instruments (5) and the plurality of main body oil tank butterfly valves (6) are sequentially connected with an accident oil pool through pipelines along an x-axis negative direction.
3. The extra-high voltage converter transformer emergency oil discharging and nitrogen injecting device is characterized in that the oil conservator oil discharging device comprises a second dual configuration electric valve group (13) and a second oil flow meter (14), a plurality of oil conservator leakage alarm instruments (15) and a plurality of oil conservator butterfly valves (16), and the second dual configuration electric valve group (13), the second oil flow meter (14), the plurality of oil conservator leakage alarm instruments (15) and the plurality of oil conservator butterfly valves (16) are sequentially connected with an accident oil pool through pipelines along the y-axis negative direction.
4. The extra-high voltage converter transformer emergency oil discharging and nitrogen injecting device according to claim 1, wherein the nitrogen injecting device comprises a plurality of nitrogen bottle groups (21), an air converging valve (22), an air injecting pipeline (23), a control valve (24) and a nitrogen injecting port (25), the plurality of nitrogen bottle groups (21) are connected with one end of the air injecting pipeline (23) through the air converging valve (22), the other end of the air injecting pipeline (23) is connected with the nitrogen injecting port (25), the control valve (24) is arranged between the air injecting pipeline (23) and the nitrogen injecting port (25), and the nitrogen injecting port (25) is connected with an air injecting port which is arranged on the upper portion of the middle portion of two sides of the main oil tank (1).
5. The extra-high voltage commutation allergic rapid oil discharge and nitrogen injection device according to claim 4, wherein the number of nitrogen cylinders of the nitrogen cylinder group (21) is calculated by the following formula:
s＝V2/V1 (1)
wherein s is the number of nitrogen cylinders, P1Is the pressure of nitrogen gas in the main oil tank after nitrogen charging, P2Pressure of nitrogen in nitrogen cylinder, V1Is a single bottle of nitrogen gas at a pressure of P1Is filled into the volume, V, occupied in the body oil tank2The volume of the transformer oil in the oil tank body, phi is the diameter of the nitrogen cylinder, and h is the height of the nitrogen cylinder.
6. The extra-high voltage commutation allergic oil draining and nitrogen injecting device as claimed in claim 2, wherein the first dual configuration electric valve set (4) comprises two normally closed butterfly valves, one end of each of the two normally closed butterfly valves is connected with the first oil flow meter (3) through a pipeline after being connected in parallel, the other end of each of the two normally closed butterfly valves is connected with the body oil tank leakage alarm (5) through a pipeline, and a power circuit and a control circuit of each of the normally closed butterfly valves are independently powered.
7. The extra-high voltage commutation allergic oil draining and nitrogen injecting device as claimed in claim 3, wherein the second dual configuration electric valve set (13) comprises two normally closed butterfly valves, and after the two normally closed butterfly valves are connected in parallel, one end of the valve set is connected with the second oil flow meter (14) through a pipeline, and the other end of the valve set is connected with the oil conservator leakage alarm (15).
8. The extra-high voltage converter transformer emergency oil discharging and nitrogen injecting device as claimed in claim 1, wherein the pipeline is an explosion-proof flame arrester oil discharging pipeline.
9. The control system applied to the extra-high voltage converter transformer emergency oil discharging and nitrogen injecting device is characterized by comprising an oil discharging control cabinet, a first control center and a second control center, wherein the oil discharging control cabinet is integrated with a first oil discharging control unit and a second oil discharging control unit; the oil discharge control cabinet is integrated with a first oil discharge control unit, a second oil discharge control unit and a nitrogen injection control unit; the first control center is respectively connected with the first oil discharge control unit, the second oil discharge control unit and the nitrogen injection control unit; the second control center is respectively connected with the first oil discharge control unit, the second oil discharge control unit and the nitrogen injection control unit; the first oil discharge control unit is respectively connected with the oil discharge device of the main oil tank, the oil discharge device of the oil conservator and the stop valve (12) in a hard wiring mode; the second oil discharge control unit is respectively connected with the oil discharge device of the main oil tank, the oil discharge device of the oil conservator and the stop valve (12) in a hard wiring mode; the nitrogen injection control unit is connected with the nitrogen injection device in a hard-wired mode.
10. The control system of the extra-high voltage converter transformer emergency oil discharge and nitrogen injection device as claimed in claim 9, wherein the first control center or the second control center sends an oil discharge starting signal, and the signal is simultaneously transmitted to the first oil discharge control unit, the second oil discharge control unit and the nitrogen injection control unit; the first oil discharge control unit transmits signals to the body oil discharge device, the oil storage cabinet oil discharge device and the stop valve (12) respectively; the second oil discharge control unit transmits signals to the oil discharge device of the body, the oil discharge device of the oil conservator and the stop valve (12) respectively; the nitrogen injection control unit sends a signal to the nitrogen injection device; and (3) controlling the cut-off valve (12) to be closed, opening the body oil discharging device, the oil storage cabinet oil discharging device and the nitrogen injection device, discharging the converter oil to the accident oil pool, and injecting nitrogen into the body oil tank (1).
11. The control system of the extra-high voltage converter transformer emergency oil discharging and nitrogen injecting device as claimed in claim 10, wherein the hard wiring is a high temperature resistant flame retardant armored shielding cable.
12. The control system of the extra-high voltage converter transformer emergency oil draining and nitrogen injecting device as claimed in claim 10, wherein the oil draining start signal is a remote manual electric start mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111710513A (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 power 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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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111710513A (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 power 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 |
| CN111710503B (en) * | 2020-07-07 | 2024-05-28 | 国网安徽省电力有限公司电力科学研究院 | Extra-high voltage converter transformer power oil discharge and nitrogen injection device, control system and method |
| CN111710513B (en) * | 2020-07-07 | 2024-09-10 | 国网安徽省电力有限公司电力科学研究院 | Extra-high voltage converter transformer power oil discharge device, control system and method |
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