CN111710514A - Extra-high voltage converter transformer emergency oil discharge device, control system and method - Google Patents
Extra-high voltage converter transformer emergency oil discharge device, control system and method Download PDFInfo
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- CN111710514A CN111710514A CN202010648576.4A CN202010648576A CN111710514A CN 111710514 A CN111710514 A CN 111710514A CN 202010648576 A CN202010648576 A CN 202010648576A CN 111710514 A CN111710514 A CN 111710514A
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- 239000003063 flame retardant Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 12
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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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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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C4/00—Flame traps allowing passage of gas but not of flame or explosion wave
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
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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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- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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Abstract
An extra-high voltage converter transformer emergency oil discharge device, a control system and a method belong to the field of extra-high voltage converter transformer emergency oil discharge, and comprise a body tee joint, a cut-off valve, a body oil tank oil discharge device, an oil storage cabinet oil discharge 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 to 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; when discharging oil, the cut-off valve is closed to cut off the oil supply pipeline from the oil storage cabinet to the body oil tank, the oil discharge device of the body oil tank and the oil storage cabinet independently discharges oil, and the transformer oil in the body oil tank and the oil storage cabinet is rapidly discharged when an initial fire disaster occurs.
Description
Technical Field
The invention belongs to the field of extra-high voltage converter transformer emergency oil discharge, and particularly relates to an extra-high voltage converter transformer emergency oil discharge device, a control system and a control method.
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, so that the oil discharge time is too long, and the actual requirements on the site cannot be met;
(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.
Therefore, when a fire disaster occurs in the initial stage of the ultrahigh voltage converter transformer, how to quickly, safely and reliably discharge a large amount of transformer oil in the main oil tank and the oil conservator is a problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of how to quickly, safely and reliably discharge a large amount of transformer oil in a body oil tank and an oil storage cabinet when a fire disaster occurs at the initial stage of an extra-high voltage converter transformer.
The invention solves the technical problems through the following technical scheme.
An extra-high voltage current conversion emergency oil discharge 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 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; when oil needs to be discharged, the stop valve (12) is closed to cut off an oil supply pipeline from the oil storage cabinet (10) to the main oil tank (1), and the main oil tank oil discharging device and the oil storage cabinet oil discharging device independently discharge oil to the accident oil pool.
When the ultrahigh voltage current conversion emergency oil discharge device receives an oil discharge starting signal, the cut-off valve is closed, an oil discharge pipeline of an explosion-retardant flame-retardant type flame arrester from the oil storage cabinet to the body oil tank is cut off, the body oil tank and the oil storage cabinet independently discharge oil by adopting a set of oil discharge device respectively, oil in the oil storage cabinet does not enter the body oil tank any more, the oil discharge time is greatly shortened, and the transformer oil is prevented from continuously overflowing and burning; after the oil tank of the body is completely drained, the solid insulation inside the transformer is smaller than the burning fire after oil gas leaks, so that the oil-fire mixture can be effectively prevented from flowing into a valve hall after the side sleeve of the converter transformer is burnt, and the fire is prevented from being expanded.
As a further improvement of the technical scheme, the oil discharging device for the body oil tank comprises an inspection valve (2), a first oil flow meter (3), a first duplex configuration electric valve group (4), a plurality of body oil tank leakage alarm instruments (5) and a plurality of body oil tank butterfly valves (6), wherein the body oil tank (1), the inspection valve (2), the first oil flow meter (3), the first duplex configuration electric valve group (4), the plurality of body oil tank leakage alarm instruments (5) and the plurality of body oil tank butterfly valves (6) are sequentially connected with an accident oil pool through pipelines along the x-axis negative direction.
As a further improvement of the technical scheme of the invention, the oil conservator oil draining device comprises a second dual configuration electric valve group (13), a second oil flow meter (14), a plurality of oil conservator leakage alarm instruments (15) and a plurality of oil conservator butterfly valves (16), wherein 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 emergency oil pool through pipelines along the y-axis negative direction.
As a further improvement of the technical scheme of the invention, the first dual configuration electric valve group (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 instrument (5) through a pipeline, and a power supply loop and a control loop of each normally closed butterfly valve are independently powered.
As a further improvement of the technical scheme of the invention, the second dual configuration electric valve set (13) comprises two normally closed butterfly valves, one end of each of the two normally closed butterfly valves is connected with the second oil flow meter (14) through a pipeline after the two normally closed butterfly valves are connected in parallel, and the other end of each of the two normally closed butterfly valves is connected with the oil conservator leakage alarm instrument (15) through a pipeline.
As a further improvement of the technical scheme of the invention, the pipeline adopts an oil discharge pipeline of an explosion-proof flame arrester.
A control system applied to the extra-high voltage converter transformer emergency oil discharge device comprises an oil discharge control cabinet, a first control center and a second control center, wherein the oil discharge control cabinet is integrated with a first oil discharge control unit and a second oil discharge control unit; the first control center is respectively connected with the first oil discharge control unit and the second oil discharge control unit; the second control center is respectively connected with the first oil discharge control unit and the second oil discharge 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; and 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.
As a further improvement of the technical scheme of the invention, the first control center or the second control center sends out an oil discharge starting signal, the signal is simultaneously transmitted to the first oil discharge control unit and the second oil discharge control unit, and the first oil discharge control unit respectively transmits the signal to the body oil discharge device, the oil storage cabinet oil discharge device and the cut-off valve (12); meanwhile, 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; and (3) controlling the cut-off valve (12) to be closed, and opening the oil discharging device of the body and the oil discharging device of the oil storage cabinet to discharge the converter oil to the accident oil pool.
As a further improvement of the technical scheme of the invention, the hard wire is a high-temperature-resistant flame-retardant armored shielding cable.
A control method based on the control system comprises the following steps:
1) the first control center or the second control center 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) from the oil storage cabinet (10) is cut off;
2) 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;
3) 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;
4) when the oil level of the main oil tank (1) of the converter transformer reaches an oil discharge ending threshold 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.
As a further improvement of the technical solution of the present invention, the method for generating the oil discharge start signal includes the following steps:
1) the oil discharge control cabinet receives the heavy gas signal, the fire alarm signal and the transformer power-off signal, and outputs the three signals after logically AND; the output logic 'AND' signal is sent to a first control center and a second control center;
2) and the first control center or the second control center reports a request after eliminating interference conditions such as false alarm, small-scale fire alarm and the like according to the field conditions, and sends an oil discharge starting signal to the oil discharge control cabinet after comprehensive judgment processing.
As a further improvement of the technical scheme of the invention, the oil discharge starting signal adopts a remote manual electric starting mode.
The invention has the advantages that:
(1) when the ultrahigh voltage current conversion emergency oil discharge device receives an oil discharge starting signal, the cut-off valve is closed, an oil discharge pipeline of an explosion-retardant flame-retardant type flame arrester from the oil storage cabinet to the body oil tank is cut off, the body oil tank and the oil storage cabinet independently discharge oil by adopting a set of oil discharge device respectively, oil in the oil storage cabinet does not enter the body oil tank any more, the oil discharge time is greatly shortened, and the transformer oil is prevented from continuously overflowing and burning; after the oil tank of the body is completely drained, the solid insulation inside the transformer is smaller than the burning fire after oil gas leaks, so that the oil-fire mixture can be effectively prevented from flowing into a valve hall after the side sleeve of the converter transformer is burnt, and the fire is prevented from being expanded.
(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 draining device of a main body oil tank in an embodiment of the invention;
FIG. 2 is a structural diagram of an oil discharging device of an oil conservator according to an embodiment of the present invention;
FIG. 3 is a block diagram of an emergency drain system according to an embodiment of the present invention;
fig. 4 is a control system diagram of an emergency drain system according to an embodiment of the present invention;
FIG. 5 is a logic diagram of an emergency drain enable signal according to an embodiment of the present invention;
fig. 6 is a starting process of the emergency oil drainage system according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:
examples
As shown in fig. 1 and 2, an emergent oil discharge device of extra-high voltage converter transformer, including the oil discharge device of body oil tank 1 and the oil discharge device of conservator 10, the oil discharge device of body oil tank 1 includes that maintenance valve 2, first oil flow meter 3, the first dualization is prepared electric valve group 4, a plurality of body oil tank and is revealed alarm 5, a plurality of body oil tank butterfly valves 6, accident oil pool, the oil discharge device of conservator 10 includes that body tee bend 11, cutoff valve 12, the dualization of second are prepared electric valve group 13, second oil flow meter 14, and alarm 15, a plurality of conservator butterfly valves 16 are revealed to a plurality of conservators.
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 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.
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 first oil flow meter 3 and the second oil flow meter 14 are used for monitoring the flow of the converter transformer oil in the oil discharge pipeline of the anti-explosion flame-retardant fire arrestor in real time.
After the control system sends a signal to the oil discharge device of the main body oil tank 1 or the oil discharge device of the oil conservator 10, the first dual-configuration electric valve group 4 or the second dual-configuration electric valve group 13 is switched from normal close to normal open, and enters an oil discharge mode; the two normally closed butterfly valves of the first dual-configuration electric valve group 4 and the second dual-configuration electric valve group 13 respectively comprise 1 independent power circuit and a control circuit, a power circuit power supply of each normally closed butterfly valve adopts a 220V single-phase alternating current power supply and is respectively taken from different bus sections of an alternating current system for a station, and a control circuit control power supply of each normally closed butterfly valve is respectively taken from 110V direct current 1 section and 110V direct current 2 section for the station, so that the condition that two normally closed butterfly valves cannot work normally simultaneously due to voltage loss or direct current grounding of one section of direct current bus is avoided.
Alarm 5 is revealed to body oil tank and alarm 15 is revealed to the oil storage tank and is used for when the normal operating or emergent oil extraction of current conversion becomes, whether real-time supervision flame retardant type spark arrester oil drain pipe exists and reveals.
The oil discharge pipeline of the explosion-proof flame arrester has the wall effect, the heat conduction effect and the flame blocking effect, and prevents flame from entering an evacuated oil pipe together 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 extra-high voltage current conversion emergency oil drain system comprises a control system, a main body oil tank oil drain device, a conservator oil drain device and a stop valve 12, wherein the control system controls the starting and the closing of the main body oil tank oil drain device, the conservator oil drain device and the stop valve 12 according to an oil drain starting signal.
As shown in fig. 4, the control system includes an oil discharge control cabinet, a control center a, and a control center B, where the oil discharge control cabinet integrates an oil discharge control unit a and an oil discharge control unit B; the control center A is respectively in communication connection with the oil discharge control unit A and the oil discharge control unit B through IEC 61850; 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 the oil discharge device of the body oil tank, a second dual configuration electric valve group 13 of the oil discharge device of the oil conservator and a stop valve 12 in a hard wiring 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 and an oil discharge control unit B, 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 stop 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; 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, and discharging the converter oil to the accident oil pool.
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. 5, the method for generating an oil drainage 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 unit.
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. 6, in the starting process of the oil discharging device of the main oil tank and the oil discharging device of the oil conservator of the extra-high voltage current conversion emergency oil discharging system, the control center a or the control center B powers on the system and sends an oil discharging starting signal to the oil discharging control cabinet, and at this time, the oil discharging control cabinet controls the cut-off valve 12 to close, and cuts off the pipeline which supplies oil to the main oil tank 1 together with the oil conservator 10; after the oil discharging device of the body oil tank receives an oil discharging starting signal, two normally closed butterfly valves of the first dual configuration electric valve group 4 act, the body oil tank 1 starts to discharge oil, and at the moment, the oil discharging control cabinet starts to time; and after the timing is accumulated for 10s, a signal is sent to an oil drain device of the oil conservator, after the oil drain device of the oil conservator receives the signal, two normally closed butterfly valves of the second dual configuration electric valve group 13 act, and the oil conservator 10 starts to drain oil. Because the oil mass inside the oil conservator 10 is far less than the oil mass of the body oil tank 1, when the oil level of the converter transformer body oil tank 1 reaches the oil discharge end threshold value (the oil level gauge in the converter transformer body oil tank reaches the limit value), the dual-configuration electric valve set is closed, and the oil discharge process of the body oil tank oil discharge device and the oil conservator oil discharge device is ended.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. An extra-high voltage current conversion emergency oil discharge device is used for discharging oil 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 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; when oil is discharged, the cut-off valve (12) is closed to cut off an oil supply pipeline from the oil storage cabinet (10) to the main oil tank (1), and the main oil tank oil discharge device and the oil storage cabinet oil discharge device independently discharge oil to the accident oil pool respectively.
2. The extra-high voltage commutation emergency oil discharge device according to claim 1, wherein the main oil tank oil discharge device comprises a service valve (2), a first oil flow meter (3), a first dual configuration electric valve group (4), a plurality of main oil tank leakage alarm instruments (5) and a plurality of main oil tank butterfly valves (6), and the main oil tank (1), the service valve (2), the first oil flow meter (3), the first dual configuration electric valve group (4), the plurality of main oil tank leakage alarm instruments (5) and the plurality of main 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 commutation emergency oil discharge device according to claim 1, wherein the oil conservator oil discharge device comprises a second dual configuration electric valve set (13), a second oil flow meter (14), a plurality of conservator leakage alarm instruments (15) and a plurality of conservator butterfly valves (16), and the second dual configuration electric valve set (13), the second oil flow meter (14), the plurality of conservator leakage alarm instruments (15) and the plurality of conservator butterfly valves (16) are sequentially connected with an emergency oil pool through pipelines along a y-axis negative direction.
4. The extra-high voltage commutation emergency oil discharge device according to 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 supply loop and a control loop of each of the two normally closed butterfly valves are independently powered.
5. The extra-high voltage commutation emergency oil discharge device according to 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 two normally closed butterfly valves is connected with the second oil flow meter (14) through a pipeline, and the other end of the two normally closed butterfly valves is connected with the oil conservator leakage alarm (15) through a pipeline.
6. The extra-high voltage commutation emergency oil drain device as claimed in claim 1, wherein the pipeline is an explosion-proof flame arrester oil drain pipeline.
7. The control system applied to the extra-high voltage converter transformer emergency oil discharge device is characterized by comprising an oil discharge control cabinet, a first control center and a second control center, wherein the oil discharge control cabinet is integrated with a first oil discharge control unit and a second oil discharge control unit; the first control center is respectively connected with the first oil discharge control unit and the second oil discharge control unit; the second control center is respectively connected with the first oil discharge control unit and the second oil discharge 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; and 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.
8. The control system of the extra-high voltage converter transformer emergency oil discharge device according to claim 7, 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 and the second oil discharge 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 cut-off valve (12) respectively, and the second oil discharge control unit transmits signals to the body oil discharge device, the oil storage cabinet oil discharge device and the cut-off valve (12) respectively; and closing the stop valve (12), opening the oil discharging device of the body and the oil discharging device of the oil storage cabinet, and discharging the converter oil to the accident oil pool.
9. The control system of the extra-high voltage converter transformer emergency oil discharge device according to claim 7, wherein the hard wiring is a high temperature resistant flame retardant armored shielded cable.
10. A control method based on the control system according to any one of claims 7 to 9, characterized by comprising the steps of:
1) the first control center or the second control center 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) from the oil storage cabinet (10) is cut off;
2) 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;
3) 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;
4) when the oil level of the main oil tank (1) of the converter transformer reaches an oil discharge ending threshold 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.
11. The method for controlling the system of the extra-high voltage converter transformer emergency oil discharge device according to claim 10, wherein the method for generating the oil discharge starting signal comprises the following steps:
1) the oil discharge control cabinet receives the heavy gas signal, the fire alarm signal and the transformer power-off signal, and outputs the three signals after logically AND; the output logic 'AND' signal is sent to a first control center and a second control center;
2) and the first control center or the second control center reports a request after eliminating interference conditions such as false alarm, small-scale fire alarm and the like according to the field conditions, and sends an oil discharge starting signal to the oil discharge control cabinet after comprehensive judgment processing.
12. The method for controlling the system of the extra-high voltage converter transformer emergency oil discharge device according to claim 10, wherein the oil discharge starting signal adopts a remote manual electric starting mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114033906A (en) * | 2021-10-20 | 2022-02-11 | 浙江省送变电工程有限公司 | Transformer emergency oil discharge system and installation method thereof |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114033906A (en) * | 2021-10-20 | 2022-02-11 | 浙江省送变电工程有限公司 | Transformer emergency oil discharge system and installation method thereof |
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