CN113588925B - Online monitoring system for dissolved gas in transformer oil - Google Patents
Online monitoring system for dissolved gas in transformer oil Download PDFInfo
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- CN113588925B CN113588925B CN202110921674.5A CN202110921674A CN113588925B CN 113588925 B CN113588925 B CN 113588925B CN 202110921674 A CN202110921674 A CN 202110921674A CN 113588925 B CN113588925 B CN 113588925B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 109
- 238000007872 degassing Methods 0.000 claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims abstract 3
- 238000001125 extrusion Methods 0.000 claims description 24
- 230000004888 barrier function Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 6
- 150000002431 hydrogen Chemical class 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2841—Gas in oils, e.g. hydrogen in insulating oils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses an online monitoring system for dissolved gas in transformer oil, which comprises the following components: the device comprises a degassing tank, a liquid level sensor, a hydrogen sensor, an air pump, a pressure sensor, a transformer, an oil inlet pipe, a first electromagnetic valve and a micro water sensor; the liquid level sensor is arranged in the inner cavity of the degassing tank; the air pump is arranged at the top end of the degassing tank; the pressure sensor is arranged at the left side of the top end of the degassing tank, and the detection end of the pressure sensor extends into the degassing tank; the transformer is arranged on the outer side of the degassing tank; the outer side of the degassing tank is provided with a liquid inlet mechanism, and the outer side of the transformer is provided with an oil return mechanism. The online monitoring system for the dissolved gas in the transformer oil can detect the gas in the oil circuit circulation and test return oil process, prevent the gas from entering the transformer, and can rapidly exhaust the gas after the gas enters the transformer, so that the gas is prevented from entering the transformer to circulate along with the return solution.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to an online monitoring system for dissolved gas in transformer oil.
Background
A Transformer (Transformer) is a device for changing an ac voltage by using the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil, and an iron core (magnetic core), and the main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), and the like, can be classified into: power transformers and special transformers (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mining transformer, audio transformer, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.), circuit symbols are usually T at the beginning of the number, examples: t01, T201, etc.;
in the prior art, in order to accurately test data and actually reflect the content of gas in oil of a transformer body in the detection process of an online monitoring device for transformer oil dissolved gas, the oil sample in the transformer body needs to be circulated to replace the oil sample in an oil pipe connected between the transformer and monitoring equipment, so that the degassed oil sample in a degassing tank can completely represent the oil sample of the transformer body, the oil sample continuously returns to the transformer after degassing is finished, and the monitoring device is required to not pollute and consume the transformer oil sample in the monitoring process and can not bring air or carrier gas into the transformer due to the fault of the monitoring device after the oil sample circulation replacement and the oil sample degassing of the connecting pipeline are finished, thus the transformer protection malfunction or power failure is caused, and the device capable of preventing the gas from entering the transformer in the oil circuit circulation and the test return oil process is lacking at present.
Disclosure of Invention
The invention aims to provide an online monitoring system for dissolved gas in transformer oil, so as to at least solve the problems.
In order to achieve the above purpose, the present invention provides the following technical solutions: an on-line monitoring system for dissolved gas in transformer oil, comprising:
a degassing tank;
the liquid level sensor is arranged in the inner cavity of the degassing tank;
the hydrogen sensor is arranged on the right side of the top end of the degassing tank, and the detection end of the hydrogen sensor extends into the degassing tank;
the air pump is arranged at the top end of the degassing tank, and a pressurizing port of the air pump extends into the degassing tank;
the pressure sensor is arranged at the left side of the top end of the degassing tank, and the detection end of the pressure sensor extends into the degassing tank;
the transformer to be monitored is arranged at the outer side of the degassing tank;
one end of the oil inlet pipe is connected with an oil inlet of the transformer to be monitored through a flange, and the other end of the oil inlet pipe extends into an inner cavity of the degassing tank;
the first electromagnetic valve is arranged in the oil inlet pipe pipeline;
the micro water sensor is arranged in the oil inlet pipe pipeline and positioned at the tail end of the joint of the transformer to be monitored;
the outside of the degassing tank is provided with a liquid inlet mechanism, and the outside of the monitored transformer is provided with an oil return mechanism.
Preferably, the liquid inlet mechanism comprises: the device comprises a liquid injection pipe, a second electromagnetic valve, a third electromagnetic valve, a vacuum pump, a fourth electromagnetic valve, a sixth electromagnetic valve and a gas detection unit; the liquid injection pipe is arranged at the outer side of the degassing tank; the second electromagnetic valve is arranged at the tail end of the joint of the liquid injection pipe and the inner cavity of the degassing tank; the third electromagnetic valve is arranged at the outer end of the joint of the liquid injection pipe and the inner cavity of the degassing tank; the vacuum pump is arranged in the liquid injection pipe pipeline and is positioned at the joint of the vacuum pump and the inner side of the third electromagnetic valve; the fourth electromagnetic valve is arranged at the outer side of the liquid injection pipe, and a fourth electromagnetic valve inlet pipe is communicated with the liquid injection pipe at the joint of the third electromagnetic valve and the vacuum pump; the sixth electromagnetic valve is arranged at the outer side of the liquid injection pipe, and an outlet pipe of the sixth electromagnetic valve is communicated with the liquid injection pipe at the joint of the second electromagnetic valve and the degassing tank; the gas detection unit is arranged on the inner sides of the fourth electromagnetic valve and the sixth electromagnetic valve and is respectively communicated with the outlet pipe of the fourth electromagnetic valve and the inlet pipe of the sixth electromagnetic valve.
Preferably, the oil return mechanism includes: the device comprises a first oil return pipe, a gas-proof assembly, a second oil return pipe, a seventh electromagnetic valve, a gear pump, an eighth electromagnetic valve and a rapid exhaust assembly; one end of the first oil return pipe is connected with an oil return port of the transformer to be monitored through a flange; the gas-proof component is arranged at the other end of the first oil return pipe; one end of the second oil return pipe is connected with the gas-proof component, and the other end of the second oil return pipe is connected with the inner cavity of the degassing tank; the seventh electromagnetic valve is arranged in the second oil return pipe pipeline and is positioned at the tail end of the joint of the second oil return pipe and the gas-proof component; the gear pump is arranged in the second oil return pipe pipeline and is positioned at the tail end of the joint of the second oil return pipe and the degassing tank; the eighth electromagnetic valve is arranged on the outer side of the gas-proof component; the quick exhaust assembly is arranged on the outer side of the eighth electromagnetic valve.
Preferably, the gas-proof assembly includes: a gas prevention tank, a lower liquid level sensor and an upper liquid level sensor; the gas-proof tank is arranged on the outer side of the transformer to be monitored, and an inlet pipe of the eighth electromagnetic valve extends into the top end position of the inner cavity of the gas-proof tank; the lower liquid level sensor is arranged below the inner cavity of the gas-proof tank, and the first oil return pipe extends into the inner cavity of the gas-proof tank and is positioned below the lower liquid level sensor; the upper liquid level sensor is arranged above the inner cavity of the gas-proof tank, and the second oil return pipe extends into the inner cavity of the gas-proof tank and is positioned above the upper liquid level sensor.
Preferably, the rapid exhaust assembly includes: the quick exhaust assembly comprises a quick exhaust assembly shell, a PLC (programmable logic controller), a first gas electromagnetic valve, a second gas electromagnetic valve, an air bag and a connecting conduit; the rapid exhaust component shell is arranged on the outer side of the eighth electromagnetic valve; the PLC controller is arranged on the front side of the rapid exhaust component shell; the first gas electromagnetic valve is arranged on the left side of the rapid exhaust component shell, the first gas electromagnetic valve is electrically connected with the PLC, and the gas outlet of the first gas electromagnetic valve is exposed outside; the second gas electromagnetic valve is arranged on the right side of the rapid exhaust component shell, an air inlet of the second gas electromagnetic valve is connected with an outlet of the eighth electromagnetic valve through a conduit, and the second gas electromagnetic valve is electrically connected with the PLC; the air bag is arranged above the inner cavity of the rapid exhaust component shell; the number of the connecting pipes is two, the two connecting pipes are respectively connected with the left side and the right side of the inner cavity of the air bag in a threaded mode, the outer sides of the left connecting pipe and the right connecting pipe extend out of the outer wall of the rapid exhaust component shell and are respectively connected with the air inlet of the first gas electromagnetic valve and the air outlet of the second gas electromagnetic valve in a threaded mode.
Preferably, the rapid exhaust assembly further comprises: the device comprises a mounting seat, an extrusion seat and a half gear; the mounting seat is arranged at the bottom end of the inner cavity of the rapid exhaust assembly shell and is positioned below the air bag; the number of the extrusion seats is two, the two extrusion seats are respectively connected with the front end and the rear end of the inner side of the mounting seat in a rotating way through pin shafts, and the inner sides of the two extrusion seats are respectively contacted with the outer wall of the air bag; the number of the half gears is two, and the two half gears are respectively arranged at the bottom ends of the front extrusion seat and the rear extrusion seat and meshed with each other; wherein, the outside of mount pad sets up at drive unit.
Preferably, the driving unit includes: a servo motor and a gear; the servo motor is arranged on the outer side of the mounting seat, the output end of the servo motor extends into the mounting seat, and the servo motor is electrically connected with the PLC; the gear screw is connected to the output end of the servo motor, and the gear is meshed with the outer side of one of the half gears.
Compared with the prior art, the invention has the beneficial effects that: the on-line monitoring system for the dissolved gas in the transformer oil comprises:
1. the oil level can be detected by a lower liquid level sensor and an upper liquid level sensor in the gas-proof tank at the same time to indicate that the inside of the monitored transformer works normally, when the upper liquid level sensor does not detect the oil level, the gas inside the gas-proof tank enters the gas and the gas possibly exists in the back flow process in the monitored transformer, the gear pump and the seventh electromagnetic valve are controlled to stop working, meanwhile, the eighth electromagnetic valve is opened, oil of the monitored transformer body flows into the gas-proof tank under the action of gravity so as to extrude air in the gas-proof tank along the eighth electromagnetic valve, and the gas in the gas-proof tank is emptied until the upper liquid level sensor detects that the inside of the gas-proof tank is refilled with oil samples, and then the gear pump and the seventh electromagnetic valve can be continuously started for oil return;
2. the gear is driven by the servo motor to intermittently rotate clockwise or anticlockwise, the half gear drives the extrusion seat at the corresponding position to rotate under the action of the rotation force of the gear, so that the other half gear drives the extrusion seat at the corresponding position to rotate in the opposite direction, the front extrusion seat and the rear extrusion seat extrude the outer wall of the air bag to realize gas suction and discharge, the second gas electromagnetic valve and the first gas electromagnetic valve are respectively opened and closed in sequence to realize communication with the eighth electromagnetic valve and the outside, and the air bag is enabled to suck the gas inside the gas prevention tank into the eighth electromagnetic valve and discharge the gas from the first gas electromagnetic valve under the cooperation of the connecting guide pipe at the corresponding position, so that the gas is rapidly sucked;
therefore, the gas can be detected in the oil circuit circulation and test return oil process, the gas is prevented from entering the transformer, and the gas can be rapidly discharged after entering, so that the gas is prevented from entering the transformer to circulate along with the return solution.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the gas barrier assembly of FIG. 1;
fig. 3 is a schematic exploded view of the quick exhaust assembly of fig. 1.
In the figure: 1. the device comprises a degassing tank, 2, a liquid level sensor, 3, a hydrogen sensor, 4, an air pump, 5, a pressure sensor, 6, a transformer, 7, an oil inlet pipe, 8, a first electromagnetic valve, 9, a micro water sensor, 10, an air pipe, 11, a second electromagnetic valve, 12, a vacuum pump, 13, a third electromagnetic valve, 14, a fourth electromagnetic valve, 15, a gas detection unit, 16, a sixth electromagnetic valve, 17, a first oil return pipe, 18, an anti-gas assembly, 1801, an anti-gas tank, 1802, a lower liquid level sensor, 1803, an upper liquid level sensor, 19, a second oil return pipe, 20, a seventh electromagnetic valve, 21, a gear pump, 22, an eighth electromagnetic valve, 23, a quick exhaust assembly housing, 2301, a quick exhaust assembly housing, 2302, a PLC controller, 2303, a first gas electromagnetic valve, 2304, a second gas electromagnetic valve, 2305, an air bag, 2306, a connecting pipe, 2307, a mounting seat, 2308, an extrusion seat, 2309, a semi-gear, 2310, a servo motor 2311, a gear.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the present invention provides a technical solution: an on-line monitoring system for dissolved gas in transformer oil, comprising: the device comprises a degassing tank 1, a liquid level sensor 2, a hydrogen sensor 3, an air pump 4, a pressure sensor 5, a monitored transformer 6, an oil inlet pipe 7, a first electromagnetic valve 8 and a micro water sensor 9; the liquid level sensor 2 is arranged in the inner cavity of the degassing tank 1, the specific use type of the liquid level sensor 2 is directly purchased, installed and used from the market according to the actual use requirement, and the liquid level sensor 2 can detect the oil capacity in the inner cavity of the degassing tank 1; the hydrogen sensor 3 is arranged on the right side of the top end of the degassing tank 1, the detection end of the hydrogen sensor 3 extends into the degassing tank 1, the specific use model of the hydrogen sensor 3 is directly purchased, installed and used from the market according to the actual use requirement, and the hydrogen sensor 3 can detect the inner cavity of the degassing tank 1; the air pump 4 is arranged at the top end of the degassing tank 1, a pressurizing port of the air pump 4 extends into the degassing tank 1, the specific use type of the air pump 4 is directly purchased from the market according to the actual use requirement, and the air pump 4 can pressurize the interior of the degassing tank 1, so that the transformer oil stored in the degassing tank 1 is led to the oil inlet pipe 7 under the pressure; the pressure sensor 5 is arranged at the left side of the top end of the degassing tank 1, the detection end of the pressure sensor 5 extends into the degassing tank 1, the specific use model of the pressure sensor 5 is directly purchased, installed and used from the market according to the actual use requirement, and the pressure sensor 5 can detect the pressure in the inner cavity of the degassing tank 1; the transformer 6 to be monitored is arranged outside the degassing tank 1; one end of an oil inlet pipe 7 is connected with an oil inlet of the transformer 6 to be monitored through a flange, and the other end of the oil inlet pipe 7 extends into the inner cavity of the degassing tank 1; the first electromagnetic valve 8 is arranged in the pipeline of the oil inlet pipe 7, the specific use type of the first electromagnetic valve 8 is directly purchased, installed and used from the market according to the actual use requirement, and the first electromagnetic valve 8 can control the oil inlet pipe 7 to be communicated with or closed by the monitored transformer 6; the micro water sensor 9 is arranged in the pipeline of the oil inlet pipe 7 and positioned at the tail end of the joint of the transformer 6 to be monitored, the specific use model of the micro water sensor 9 is directly purchased, installed and used from the market according to the actual use requirement, and the micro water sensor 9 can enter transformer oil in the transformer 6 to be monitored for detection; wherein, the outside of degasification jar 1 is provided with feed liquor mechanism, and the outside of monitored transformer 6 is provided with oil return mechanism.
As a preferred scheme, still further, feed liquor mechanism includes: a gas pipe 10, a second solenoid valve 11, a third solenoid valve 13, a vacuum pump 12, a fourth solenoid valve 14, a sixth solenoid valve 16, and a gas detection unit 15; the air pipe 10 is arranged outside the degassing tank 1; the second electromagnetic valve 11 is arranged at the tail end of the joint of the air pipe 10 and the inner cavity of the degassing tank 1, the specific use type of the second electromagnetic valve 11 is directly purchased, installed and used from the market according to the actual use requirement, and the second electromagnetic valve 11 can control the air pipe 10 to be communicated or closed; the third electromagnetic valve 13 is arranged at the outer end of the joint of the air pipe 10 and the inner cavity of the degassing tank 1, the specific use type of the third electromagnetic valve 13 is directly purchased, installed and used from the market according to the actual use requirement, and the third electromagnetic valve 13 can control the air pipe 10 to be communicated with or closed to the degassing tank 1; the vacuum pump 12 is arranged in a pipeline of the air pipe 10 and is positioned at the joint of the vacuum pump 12 and the inner side of the third electromagnetic valve 13, the specific use model of the vacuum pump 12 is directly purchased, installed and used from the market according to the actual use requirement, and the vacuum pump 12 discharges the gas separated from the transformer oil in the degassing tank 1 under the cooperation of the air pipe 10; the fourth electromagnetic valve 14 is arranged on the outer side of the air pipe 10, the air pipe 10 at the joint of the fourth electromagnetic valve 14 inlet pipe, the third electromagnetic valve 13 and the vacuum pump 12 is communicated, the specific use type of the fourth electromagnetic valve 14 is directly purchased, installed and used from the market according to the actual use requirement, and the fourth electromagnetic valve 14 can control the air pipe 10 to be communicated and sealed with the gas detection unit 15; the sixth electromagnetic valve 16 is arranged on the outer side of the air pipe 10, an outlet pipe of the sixth electromagnetic valve 16 is communicated with the air pipe 10 at the joint of the second electromagnetic valve 11 and the degassing tank 1, the specific use model of the sixth electromagnetic valve 16 is directly purchased, installed and used from the market according to the actual use requirement, and the sixth electromagnetic valve 16 can control the air pipe 10 to be communicated and sealed with the gas detection unit 15; the gas detection unit 15 is arranged on the inner sides of the fourth electromagnetic valve 14 and the sixth electromagnetic valve 16, the gas detection unit 15 is respectively communicated with an outlet pipe of the fourth electromagnetic valve 14 and an inlet pipe of the sixth electromagnetic valve 16, the specific use type of the gas detection unit 15 is directly purchased, installed and used from the market according to the actual use requirement, and the gas detection unit 15 can detect the transformer oil separation gas injected into the degassing tank 1.
As a preferred solution, the oil return mechanism further includes: a first return pipe 17, a gas-proof assembly 18, a second return pipe 19, a seventh solenoid valve 20, a gear pump 21, an eighth solenoid valve 22 and a quick exhaust assembly 23; one end of the first oil return pipe 17 is connected with an oil return port of the transformer 6 to be monitored through a flange; the gas-proof component 18 is arranged at the other end of the first oil return pipe 17; one end of a second oil return pipe 19 is connected with the gas-proof component 18, and the other end of the second oil return pipe 19 is connected with the inner cavity of the degassing tank 1; the seventh electromagnetic valve 20 is arranged in the pipeline of the second oil return pipe 19 and is positioned at the tail end of the joint of the second oil return pipe 19 and the gas-proof component 18, the specific use model of the seventh electromagnetic valve 20 is directly purchased, installed and used from the market according to the actual use requirement, and the seventh electromagnetic valve 20 can control the gear pump 21 to be communicated with or sealed with the inside of the second oil return pipe 19; the gear pump 21 is arranged in the pipeline of the second oil return pipe 19 and is positioned at the tail end of the joint of the second oil return pipe 19 and the degassing tank 1, the specific use model of the gear pump 21 is directly purchased, installed and used from the market according to the actual use requirement, and the gear pump 21 can pump transformer oil in the monitored transformer 6 into the degassing tank 1 along the second oil return pipe 19 to complete circulation; the eighth electromagnetic valve 22 is arranged on the outer side of the gas-proof component 18, the specific use type of the eighth electromagnetic valve 22 is directly purchased, installed and used from the market according to the actual use requirement, and the eighth electromagnetic valve 22 can control the rapid exhaust component 23 to be communicated with or closed with the inside of the gas-proof component 18; the quick exhaust assembly 23 is disposed outside the eighth solenoid valve 22.
Preferably, further, the gas barrier assembly 18 includes: a gas proof tank 1801, a lower level sensor 1802, and an upper level sensor 1803; the gas-proof tank 1801 is arranged outside the transformer 6 to be monitored, and an inlet pipe of the eighth electromagnetic valve 22 extends into the top end position of the inner cavity of the gas-proof tank 1801; the lower liquid level sensor 1802 is arranged below the inner cavity of the gas-proof tank 1801, the first oil return pipe 17 extends into the inner cavity of the gas-proof tank 1801 and is positioned below the lower liquid level sensor 1802, so that the port of the first oil return pipe 17 in the tank entering the gas-proof tank 1801 is ensured to be below the oil sample surface in the lower liquid level sensor 1802 under any condition, no air or carrier gas can be ensured to return to the monitored transformer 6, and when the lower liquid level sensor 1802 cannot detect oil, the device must be stopped for maintenance, so that the air or carrier gas in the gas-proof tank 1801 is ensured not to return to the transformer; the upper liquid level sensor 1803 is disposed above the inner cavity of the gas-proof tank 1801, the second oil return pipe 19 extends into the inner cavity of the gas-proof tank 1801 and is located above the upper liquid level sensor 1803, and the lower liquid level sensor 1802 and the upper liquid level sensor 1803 can both detect the oil level at the same time to indicate that the monitored transformer 6 is working normally without gas entering the transformer oil circuit.
Preferably, the quick-exhaust assembly 23 further comprises: a quick vent assembly housing 2301, a PLC controller 2302, a first gas solenoid 2303, a second gas solenoid 2304, a balloon 2305, a connecting tube 2306, a mount 2307, a squeeze 2308, and a half gear 2309; the quick exhaust assembly housing 2301 is provided outside of the eighth solenoid valve 22; the PLC controller 2302 is installed on the front side of the quick exhaust assembly housing 2301, and the specific use model of the PLC controller 2302 is directly purchased, installed and used from the market according to the actual use requirements; the first gas electromagnetic valve 2303 is arranged on the left side of the quick exhaust assembly shell 2301, the first gas electromagnetic valve 2303 is electrically connected with the PLC 2302, the gas outlet of the first gas electromagnetic valve 2303 is exposed outside, the specific use model of the first gas electromagnetic valve 2303 is directly purchased, installed and used from the market according to the actual use requirement, and the first gas electromagnetic valve 2303 can be controlled by the PLC 2302 to realize that the air bag 2305 is communicated or sealed with the outside through the first gas electromagnetic valve 2303; the second gas electromagnetic valve 2304 is installed on the right side of the quick exhaust assembly shell 2301, an air inlet of the second gas electromagnetic valve 2304 is connected with an outlet of the eighth electromagnetic valve 22 through a conduit, the second gas electromagnetic valve 2304 is electrically connected with the PLC controller 2302, the specific use model of the second gas electromagnetic valve 2304 is directly purchased, installed and used from the market according to the actual use requirement, and the second gas electromagnetic valve 2304 can be controlled by the PLC controller 2302 to realize that the air bag 2305 is communicated or sealed with the eighth electromagnetic valve 22 through the second gas electromagnetic valve 2304; the balloon 2305 is disposed over the interior cavity of the quick vent assembly housing 2301; the number of the connecting pipes 2306 is two, the two connecting pipes 2306 are respectively connected with the left side and the right side of the inner cavity of the air bag 2305 in a threaded manner, the outer sides of the left connecting pipe 2306 and the right connecting pipe 2306 extend out of the outer wall of the quick exhaust assembly shell 2301 and are respectively connected with the air inlet of the first gas electromagnetic valve 2303 and the air outlet of the second gas electromagnetic valve 2304 in a threaded manner; the mounting seat 2307 is arranged at the bottom end of the inner cavity of the quick exhaust assembly housing 2301 and is positioned below the airbag 2305; the number of the extrusion seats 2308 is two, the two extrusion seats 2308 are respectively connected to the front end and the rear end of the inner side of the installation seat 2307 through pin shafts in a rotating way, and the inner sides of the two extrusion seats 2308 are respectively contacted with the outer wall of the air bag 2305; the number of the half gears 2309 is two, and the two half gears 2309 are respectively arranged at the bottom ends of the front extrusion seat 2308 and the rear extrusion seat 2308 and meshed with each other; wherein, the outside of mount 2307 sets up at the drive unit, and the drive unit includes: a servo motor 2310 and a gear 2311; the servo motor 2310 is arranged on the outer side of the mounting seat 2307, the output end of the servo motor 2310 extends into the mounting seat 2307, the servo motor 2310 is electrically connected with the PLC 2302, the specific use model of the servo motor 2310 is directly purchased from the market for installation and use according to the actual use requirement, and the servo motor 2310 can control the driving gear 2311 to intermittently rotate clockwise or anticlockwise through the PLC 2302; the gear 2311 is connected to the output end of the servo motor 2310 through screws, the gear 2311 is meshed with the outer side of one of the half gears 2309, and the half gears 2309 can drive the extrusion seat 2308 at the corresponding position to rotate under the action of the rotation force of the gear 2311.
All electric parts in the scheme can be connected with an externally-adapted power supply through wires by the aid of a person in the art, and the externally-adapted external controller is selected to be connected according to specific actual use conditions so as to meet control requirements of all electric parts, a specific connection mode and a control sequence of the externally-adapted external controller are referred to in the following working principles, electric connection of all electric parts is completed in sequence, and detailed connection means of the electric parts are known in the art and are not described any more, and the working principles and the processes are mainly described below, and the specific working is as follows.
Step 1: when the device works, the hydrogen sensor 3 and the pressure sensor 5 respectively detect the pressure and the hydrogen in the degassing tank 1, when other gases exist in the degassing tank 1, a worker opens the third electromagnetic valve 13 and the second electromagnetic valve 11 to keep the inside of the air pipe 10 communicated, the vacuum pump 12 discharges the gases separated from the transformer oil in the degassing tank 1 under the cooperation of the air pipe 10, meanwhile, the worker opens the fourth electromagnetic valve 14 and the sixth electromagnetic valve 16 to enable the injected transformer oil to pass through the gas detection unit 15, the gas detection unit 15 detects the gas of the injected transformer oil, the air pump 4 pressurizes the inside of the degassing tank 1, the transformer oil stored in the degassing tank 1 enters the monitored transformer 6 along the oil inlet pipe 7 under the pressure effect, flows back into the gas prevention component 18 through the first oil return pipe 17 after passing through the first electromagnetic valve 8 and the micro water sensor 9 for cooling circulation, when the inside of the monitored transformer 6 normally works, the gas-proof tank 1801 is filled with an oil sample, the lower liquid level sensor 1802 and the upper liquid level sensor 1803 in the gas-proof tank 1801 can simultaneously detect the oil level, and the oil level is pumped into the degassing tank 1 along the second oil return pipe 19 through the seventh electromagnetic valve 20 under the action of the gear pump 21 to complete circulation, but when the monitored transformer 6 works for a long time to cause a limit fault, the oil in the monitored transformer 6 which flows back to the transformer in the gas-proof tank 1801 through the first oil return pipe 17 is provided with air or carrier gas to occupy the space in the gas-proof tank 1801, further when the upper liquid level sensor 1803 cannot detect the oil level, the phenomenon that the gas enters the inside of the gas-proof tank 1801 and the carrier gas flows back into the monitored transformer 6 is indicated, and then the staff can control the gear pump 21 and the seventh electromagnetic valve 20 to stop working, simultaneously opening the eighth electromagnetic valve 22, and enabling oil of the monitored transformer 6 body to flow into the gas-proof tank 1801 under the action of gravity so as to extrude air in the gas-proof tank 1801 along the eighth electromagnetic valve 22, and when the gas in the gas-proof tank 1801 is emptied and the upper liquid level sensor 1803 detects that the gas-proof tank 1801 is refilled with oil samples, continuously starting the gear pump 21 and the seventh electromagnetic valve 20 to return oil;
step 2: during exhaust, a worker controls the PLC 2302 to sequentially start the servo motor 2310, the servo motor 2310 drives the gear 2311 to intermittently rotate clockwise or anticlockwise, the gear 2311 is meshed with one half gear 2309, the half gear 2309 is driven by the rotation force of the gear 2311 to rotate the extrusion seat 2308 at the corresponding position, the other half gear 2309 is driven by the side half gear 2309 to rotate the extrusion seat 2308 at the corresponding position in the opposite direction, the front and rear extrusion seats 2308 extrude the outer wall of the air bag 2305 to suck and discharge air, the PLC 2302 controls the second air solenoid valve 2304 and the first air solenoid valve 2303 to be sequentially opened and closed to be communicated with the eighth solenoid valve 22 and the outside, so that the air bag 2305 sucks air in the air tank 1801 through the eighth solenoid valve 22 and discharges the first air solenoid valve 2303 under the cooperation of the connecting guide pipe 2306 at the corresponding position, and rapid air suction is realized;
therefore, the gas can be detected in the oil circuit circulation and test return oil process, the gas is prevented from entering the transformer, and the gas can be rapidly discharged after entering, so that the gas is prevented from entering the transformer to circulate along with the return solution.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. An on-line monitoring system for dissolved gas in transformer oil, comprising:
a degassing tank (1);
the liquid level sensor (2) is arranged in the inner cavity of the degassing tank (1);
the hydrogen sensor (3) is arranged on the right side of the top end of the degassing tank (1), and the detection end of the hydrogen sensor (3) extends into the degassing tank (1);
the air pump (4) is arranged at the top end of the degassing tank (1), and a pressurizing port of the air pump (4) extends into the degassing tank (1);
a pressure sensor (5) arranged at the left side of the top end of the degassing tank (1), wherein the detection end of the pressure sensor (5) extends into the degassing tank (1);
a transformer (6) to be monitored, which is arranged outside the degassing tank (1);
the oil inlet pipe (7), one end of the oil inlet pipe (7) is connected with an oil inlet of the transformer (6) to be monitored through a flange, and the other end of the oil inlet pipe (7) extends into an inner cavity of the degassing tank (1);
the first electromagnetic valve (8) is arranged in the pipeline of the oil inlet pipe (7);
the micro water sensor (9) is arranged in the pipeline of the oil inlet pipe (7) and is positioned at the tail end of the joint of the monitored transformer (6);
the external side of the degassing tank (1) is provided with a liquid inlet mechanism, and the external side of the transformer (6) to be monitored is provided with an oil return mechanism;
the oil return mechanism includes:
the first oil return pipe (17), one end of the first oil return pipe (17) is connected with an oil return port of the transformer (6) to be monitored through a flange;
the gas-proof component (18) is arranged at the other end of the first oil return pipe (17);
one end of the second oil return pipe (19) is connected with the gas-proof assembly (18), and the other end of the second oil return pipe (19) is connected with the inner cavity of the degassing tank (1);
a seventh electromagnetic valve (20) is arranged in the pipeline of the second oil return pipe (19) and is positioned at the tail end of the joint of the second oil return pipe (19) and the gas-proof component (18);
the gear pump (21) is arranged in the pipeline of the second oil return pipe (19) and is positioned at the tail end of the joint of the second oil return pipe (19) and the degassing tank (1);
an eighth electromagnetic valve (22) provided outside the gas-proof assembly (18);
a quick exhaust assembly (23) provided outside the eighth electromagnetic valve (22);
the gas barrier assembly (18) includes:
the gas-proof tank (1801) is arranged outside the monitored transformer (6), and an inlet pipe of the eighth electromagnetic valve (22) extends into the top end position of the inner cavity of the gas-proof tank (1801);
a lower liquid level sensor (1802) disposed below the inner cavity of the gas-proof tank (1801), the first oil return pipe (17) extending into the inner cavity of the gas-proof tank (1801) and being located below the lower liquid level sensor (1802);
an upper liquid level sensor (1803) arranged above the inner cavity of the gas-proof tank (1801), and the second oil return pipe (19) extends into the inner cavity of the gas-proof tank (1801) and is positioned above the upper liquid level sensor (1803);
the quick exhaust assembly (23) comprises:
a quick exhaust assembly housing (2301) disposed outside of the eighth solenoid valve (22);
a PLC controller (2302) mounted on the front side of the quick exhaust assembly housing (2301);
the first gas electromagnetic valve (2303) is arranged on the left side of the rapid exhaust assembly shell (2301), the first gas electromagnetic valve (2303) is electrically connected with the PLC (2302), and the gas outlet of the first gas electromagnetic valve (2303) is exposed to the outside;
the second gas electromagnetic valve (2304) is arranged on the right side of the rapid exhaust assembly shell (2301), an air inlet of the second gas electromagnetic valve (2304) is connected with an outlet of the eighth electromagnetic valve (22) through a conduit, and the second gas electromagnetic valve (2304) is electrically connected with the PLC (2302);
an airbag (2305) disposed over an interior cavity of the quick exhaust assembly housing (2301);
the number of the connecting pipes (2306) is two, the two connecting pipes (2306) are respectively in threaded connection with the left side and the right side of the inner cavity of the air bag (2305), and the outer sides of the left connecting pipe (2306) and the right connecting pipe (2306) extend out of the outer wall of the rapid exhaust assembly shell (2301) and are respectively in threaded connection with the air inlet of the first gas electromagnetic valve (2303) and the air outlet of the second gas electromagnetic valve (2304);
the quick exhaust assembly (23) further comprises:
the mounting seat (2307) is arranged at the bottom end of the inner cavity of the rapid exhaust component shell (2301) and is positioned below the air bag (2305);
the two extrusion seats (2308) are respectively connected to the front end and the rear end of the inner side of the mounting seat (2307) through pin shafts in a rotating way, and the inner sides of the two extrusion seats (2308) are respectively contacted with the outer wall of the air bag (2305);
the number of the half gears (2309) is two, and the two half gears (2309) are respectively arranged at the bottom ends of the front extrusion seat (2308) and the rear extrusion seat (2308) and meshed with each other;
wherein the outer side of the mounting seat (2307) is arranged on the driving unit;
the driving unit includes:
the servo motor (2310) is arranged on the outer side of the mounting seat (2307), the output end of the servo motor (2310) extends into the mounting seat (2307), and the servo motor (2310) is electrically connected with the PLC (2302);
and a gear (2311) connected with the output end of the servo motor (2310) through a screw, wherein the gear (2311) is meshed with the outer side of one half gear (2309).
2. The online monitoring system for dissolved gas in transformer oil according to claim 1, wherein: the feed liquor mechanism includes:
a gas pipe (10) arranged outside the degassing tank (1);
the second electromagnetic valve (11) is arranged at the tail end of the joint of the air pipe (10) and the inner cavity of the degassing tank (1);
the third electromagnetic valve (13) is arranged at the outer end of the joint of the air pipe (10) and the inner cavity of the degassing tank (1);
a vacuum pump (12) arranged in the pipeline of the air pipe (10);
the fourth electromagnetic valve (14) is arranged at the outer side of the air pipe (10), and an inlet pipe of the fourth electromagnetic valve (14) is communicated with the air pipe (10) at the joint of the third electromagnetic valve (13) and the vacuum pump (12);
a sixth electromagnetic valve (16) arranged outside the air pipe (10), and an outlet pipe of the sixth electromagnetic valve (16) is communicated with the air pipe (10) at the joint of the second electromagnetic valve (11) and the degassing tank (1);
and the gas detection unit (15) is arranged on the inner sides of the fourth electromagnetic valve (14) and the sixth electromagnetic valve (16), and the gas detection unit (15) is respectively communicated with an outlet pipe of the fourth electromagnetic valve (14) and an inlet pipe of the sixth electromagnetic valve (16).
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| US4236404A (en) * | 1976-08-31 | 1980-12-02 | General Electric Company | Device for monitoring dissolved gases in electrical insulating liquids such as transformer oils |
| EP2233922A1 (en) * | 2009-03-27 | 2010-09-29 | Industrie- und Umweltlaboratorium Vorpommern GmbH | Method for online monitoring of the atmospheric gases dissolved in insulation liquids from high-voltage systems and device for carrying out this method |
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