CN111707711A - Simulation method and device for detecting dissolved gas in oil under insulating oil electrical fault - Google Patents
Simulation method and device for detecting dissolved gas in oil under insulating oil electrical fault Download PDFInfo
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- CN111707711A CN111707711A CN202010599616.0A CN202010599616A CN111707711A CN 111707711 A CN111707711 A CN 111707711A CN 202010599616 A CN202010599616 A CN 202010599616A CN 111707711 A CN111707711 A CN 111707711A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
Abstract
The invention discloses a simulation method and equipment for detecting dissolved gas in oil under an insulating oil electrical fault, wherein the simulation method comprises the following steps: rinsing, namely filling insulating oil into an experiment container, enabling the insulating oil to soak the inner wall of the experiment container, and then discharging the insulating oil in the experiment container; filling a sample, and filling insulating oil into the experimental container; simulating an electrical fault in the insulating oil in the test vessel; sampling, namely extracting a preset amount of liquid sample from the experiment container; and analyzing, namely performing gas chromatography analysis on the liquid sample. The simulation method for detecting the dissolved gas in the oil under the electrical fault of the insulating oil can carry out DGA analysis work based on the characteristics of the insulating oil under the condition of simulating the electrical fault, and forms a complete test method.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a simulation method and device for detecting dissolved gas in oil under the condition of insulating oil electrical fault.
Background
Compared with mineral insulating oil, the natural ester insulating oil has the advantages of safety, environmental protection, aging delay of paperboards and the like, and has been gradually applied to oil-filled power equipment such as oil-immersed transformers and the like as a substitute insulating liquid of the mineral insulating oil. At present, electric equipment using the natural ester insulating oil is gradually put into engineering application, and in order to ensure safe and reliable operation of the electric equipment, a corresponding fault diagnosis mechanism is perfected by a method for detecting dissolved gas in oil under the electrical fault of the natural ester insulating oil and a fault gas characteristic criterion. Dissolved Gas Analysis (DGA) in oil is an effective means for diagnosing internal faults of oil-filled equipment, years of successful application experience is achieved on mineral insulating oil equipment, a complete fault diagnosis system is formed, the application time of natural ester insulating oil is short, engineering accumulation is deficient, and corresponding DGA applicability research is still in a starting stage.
In summary, how to develop a complete test method based on the analysis of the insulating oil characteristics under the condition of simulating the electrical fault is a problem which needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the first objective of the present invention is to provide a simulation method for detecting dissolved gas in oil under electrical fault of insulating oil, which can perform DGA analysis based on insulating oil characteristics under simulated electrical fault condition to form a complete test method, and the second objective of the present invention is to provide a simulation apparatus using the simulation method for detecting dissolved gas in oil under electrical fault of insulating oil.
In order to achieve the purpose, the invention provides the following technical scheme:
a simulation method for detecting dissolved gas in oil under the condition of insulating oil electrical fault comprises the following steps:
rinsing, namely filling insulating oil into an experiment container, enabling the insulating oil to soak the inner wall of the experiment container, and then discharging the insulating oil in the experiment container;
filling a sample, and filling insulating oil into the experimental container;
simulating an electrical fault in the insulating oil in the test vessel;
sampling, namely extracting a preset amount of liquid sample from the experiment container;
and analyzing, namely performing gas chromatography analysis on the liquid sample.
Preferably, in the rinsing step, filling the experiment container with insulating oil specifically comprises: filling nitrogen or inert gas into the experimental container, extracting the gas in the experimental container to reduce the air pressure in the experimental container to a preset air pressure value, and filling insulating oil into the experimental container;
the inner wall of the experimental container which is soaked in the insulating oil is specifically as follows: vibrating the experiment container to enable the insulating oil to soak the inner wall of the experiment container;
the insulating oil discharged from the experimental container is specifically as follows: discharging insulating oil in an experimental container and simultaneously filling air, nitrogen or inert gas into the experimental container;
the rinsing step further comprises repeating the step 3-5 times.
Preferably, in the step of simulating the electrical fault, the power frequency breakdown in oil, the power frequency flashover in oilpaper or the power frequency partial discharge in oil is performed in the insulating oil in the experimental container.
Preferably, in the sampling step: extracting a preset amount of liquid sample from the bottom of the experimental container;
the sampling step further comprises: extracting a preset volume of gas sample discharged from the experiment container;
the analyzing step further comprises: the gas sample is analyzed.
A simulation apparatus to which the simulation method for detecting dissolved gas in oil under electrical failure of insulating oil as described above is applied, comprising:
the experimental container is provided with an inner cavity and comprises a container body and a cover plate detachably connected with the container body;
the air bag is communicated with the interior of the experimental container through a first pipeline, and the air inlet valve is used for controlling the on-off between the air bag and the experimental container;
the oil storage tank is communicated with the interior of the experimental container through a second pipeline, the oil taking valve is used for controlling the connection and disconnection between the oil storage tank and the experimental container, and the oil storage tank is also provided with an air hole and an air valve connected with the air hole;
an electrical fault device capable of being disposed inside the experimental vessel to simulate an electrical fault;
a liquid sampling device for withdrawing a liquid sample from within the experimental container.
Preferably, the electrical fault device comprises a first electrode and a second electrode which can be arranged in the experiment container and are oppositely arranged;
the simulation equipment further comprises a first conductive connecting rod penetrating through the top wall of the experiment container and a second conductive connecting rod penetrating through the bottom wall of the experiment container, the first electrode is fixed at the lower end of the first conductive connecting rod, and the second electrode is fixed at the upper end of the second conductive connecting rod;
the height of the first electrode and/or the second electrode is adjustable.
Preferably, the first electrode is a needle electrode or a ball electrode;
the second electrode is a plate electrode.
Preferably, an air bag valve is arranged at the air outlet of the air bag;
the bottom of the experiment container is provided with a circulation port, a sealing valve is arranged at the circulation port, and the second pipeline and the liquid sampling device are communicated with the inside of the experiment container through the circulation port.
Preferably, still include vacuum pump, gaseous collection jar and gas sampling device, gaseous collection jar pass through exhaust pipe with the gas vent at experiment container top is connected, gas sampling device is used for extracting exhaust pipe or the gas in the gaseous collection jar, the vacuum pump concatenates on the exhaust pipe.
Preferably, a three-way valve is further arranged on the exhaust pipeline, two of the flow ports of the three-way valve are connected in series on the exhaust pipeline, and the other flow port is communicated with the gas sampling device.
The simulation method and the simulation equipment for detecting the dissolved gas in the oil under the electrical fault of the insulating oil can simulate the electrical fault in the natural ester insulating oil in an experimental container, and extract a liquid sample for gas chromatography analysis so as to realize the DGA analysis work based on the characteristics of the insulating oil under the condition of simulating the electrical fault and form a complete test method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a simulation method for detecting dissolved gas in oil under an electrical fault in an insulating oil according to an embodiment of the present invention;
FIG. 2 is a flow chart of a rinse step provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a simulation apparatus for detecting dissolved gas in oil under an electrical fault of the insulating oil according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a simulation device for detecting dissolved gas in oil under an electrical fault of insulating oil according to an embodiment of the present invention, in an electrical fault simulation state;
FIG. 5 is a schematic structural diagram of a simulation apparatus for detecting dissolved gas in oil under an electrical fault of an insulating oil according to another embodiment of the present invention in an electrical fault simulation state;
FIG. 6 is a schematic structural diagram of a simulation apparatus for detecting dissolved gas in oil under an electrical fault of an insulating oil according to another embodiment of the present invention in an electrical fault simulation state;
7-9 are schematic diagrams of three electrical fault devices provided by embodiments of the present invention;
fig. 10 is a schematic structural diagram of a simulation device for detecting dissolved gas in oil under an electrical fault of the insulating oil according to an embodiment of the present invention in a sampling state.
In fig. 1-10:
the method comprises the following steps of 1-an experimental container, 1 a-a container body, 1 b-a cover plate, 2-an air bag, 3-an air bag valve, 4-a first pipeline, 5-an air inlet valve, 6-a vacuum valve, 7-a gas sampling device, 8-an exhaust pipeline, 9-an isolation valve, 10-a gas collection tank, 11-a first electrode, 12-a second electrode, 13-a support, 14-an air valve, 15-an oil storage tank, 16-an oil extraction valve, 17-a sealing valve, 18-a three-way valve, 19-a circulating oil pipe, 20-an oil pump, 21-a liquid sampling device, 22-a first conductive connecting rod, 23-a second conductive connecting rod and 24-an oil-immersed paperboard.
Detailed Description
The first purpose of the invention is to provide a simulation method for detecting the dissolved gas in the oil under the electrical fault of the insulating oil, which can carry out DGA analysis work based on the characteristics of the insulating oil under the condition of simulating the electrical fault to form a complete test method.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus are not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1-2, the simulation method for detecting dissolved gas in oil under electrical fault of insulating oil according to the present invention is mainly used for detecting dissolved gas in oil under electrical fault of natural ester insulating oil. In the present embodiment, the natural ester insulating oil is used as an example, but the insulating oil may be a mineral insulating oil, and is not limited thereto.
The simulation method for detecting the dissolved gas in the oil under the electrical fault of the insulating oil comprises the following steps:
s1, rinsing, filling insulating oil into the experiment container 1, enabling the insulating oil to soak the inner wall of the experiment container 1, and then discharging the insulating oil in the experiment container 1;
the purpose of the rinsing in step S1 is to remove impurities in the test container 1. Specifically, the experiment container 1 may be filled with the natural ester insulating oil, so that the natural ester insulating oil wets the inner wall of the experiment container 1, and then the natural ester insulating oil in the experiment container 1 may be discharged.
S2, filling a sample, and filling insulating oil into the experimental container 1;
after the rinsing, the test container 1 was filled with the natural ester insulating oil. The natural ester insulating oil used in the rinsing and sample loading steps may be a natural ester insulating oil after pretreatment.
It should be noted that the electrical fault device needs to be installed before the sample loading step, and the installation of the electrical fault device may be performed after the rinsing step and before the sample loading step, or the installation of the electrical fault device may be performed before the rinsing step, which is not limited herein.
S3 simulating an electrical fault in the insulating oil in the test container 1;
after the electrical fault device is installed and the sample is loaded, the electrical fault device is used to simulate an electrical fault in the natural ester insulating oil in the experimental container 1.
S4, sampling, and extracting a preset amount of liquid sample from the experiment container 1;
a predetermined amount of liquid sample is withdrawn from the test vessel 1 to effect sampling. In particular, a liquid sample may be drawn using a glass needle cannula.
In the sampling at step S4, a predetermined amount of liquid sample may be extracted from the bottom of the test container 1. Of course, a predetermined amount of the liquid sample may be extracted from the side of the test vessel 1. The preset amount may be a preset mass or a preset volume, and is not limited herein.
And S5, and performing gas chromatography on the liquid sample.
The simulation method for detecting the dissolved gas in the oil under the condition of the electrical fault of the insulating oil can be used for simulating the electrical fault in the natural ester insulating oil in the experimental container 1, and extracting a liquid sample for gas chromatography analysis so as to realize the DGA analysis work based on the characteristics of the insulating oil under the condition of simulating the electrical fault and form a complete test method.
Further, in the step of S1 rinsing, filling the experiment container 1 with insulating oil specifically includes: s11 filling nitrogen or inert gas into the experimental container 1; s12, reducing the air pressure in the experiment container 1 to a preset air pressure value, and filling insulating oil into the experiment container 1. Firstly filling nitrogen or inert gas into the experimental container 1 to drive away air in the experimental container 1, then vacuumizing the experimental container 1 to reduce the air pressure in the experimental container 1 to a preset air pressure value, and then filling the natural ester insulating oil. The preset air pressure value can be below 80 pa.
The specific steps for wetting the inner wall of the experimental container 1 with the insulating oil are as follows: s13 oscillates the test container 1 so that the insulating oil wets the inner wall of the test container 1. Specifically, the experimental container 1 may be slightly vibrated to make the natural ester insulating oil fully infiltrate the inner wall of the experimental container 1.
The insulating oil discharged from the test container 1 is specifically: s14 the insulating oil in the test container 1 is discharged and air, nitrogen or inert gas is charged into the test container 1.
In step S14, when the insulating oil in the test container 1 is discharged and air is filled into the test container 1, nitrogen or inert gas is required to flush the test container 1 before loading the sample. Specifically, the step of flushing the experimental container 1 is to pump the air pressure in the experimental container 1 to a preset air pressure value and then fill nitrogen or inert gas. The washing of the test vessel 1 can be repeated 3-5 times.
In order to further ensure the rinsing effect, the rinsing of S1 can be repeated 3-5 times, namely after 3-5 times of rinsing, the sample loading step of S2 is carried out. Of course, the rinsing may be performed only 2 times, which is not limited herein.
In the step of simulating the electrical fault in S3, in the insulating oil in the experimental container, the power frequency breakdown in oil, the power frequency flashover of the oilpaper or the power frequency partial discharge in the oil are carried out. Namely, the method can simulate three electrical faults of power frequency breakdown in oil, power frequency surface flashover of oil paper and power frequency partial discharge in oil.
The sampling at step S4 may further include sampling a predetermined volume of the gas sample discharged from the test container 1.
The analysis of step S5 may further include analyzing the gas sample.
Therefore, the analysis of the dissolved gas in the oil under the condition of electrical fault is realized, and the analysis of the produced gas under the condition of electrical fault can be simultaneously carried out.
Based on the simulation method for detecting the dissolved gas in the oil under the electrical fault of the insulating oil provided in the embodiment, the invention also provides simulation equipment for detecting the dissolved gas in the oil under the electrical fault of the insulating oil, and the simulation equipment comprises an experimental container 1, an air bag 2, an air inlet valve 5, an oil storage tank 15, an oil extraction valve 16, an electrical fault device and a liquid sampling device 21.
Wherein, experiment container 1 has the inner chamber, and the inner chamber of experiment container 1 is used for holding natural ester insulating oil. The experiment container 1 includes a container body 1a and a lid 1b detachably connected to the container body 1 a. The cover plate 1b and the container body 1a can be fixedly connected in a sealing way, and the cover plate 1b can be detached from the container body 1 a. Preferably, the cover plate 1b and the container body 1a may be bolted, clamped, etc., without limitation.
In addition, a holder 13 may be provided to support the test vessel 1.
The air bag 2 is communicated with the interior of the experimental container 1 through a first pipeline 4, the air inlet valve 5 is used for controlling the on-off between the air bag 2 and the experimental container 1, and the on-off between the air bag 2 and the experimental container 1 is controlled by opening and closing the air inlet valve 5. The two ends of the first pipeline 4 are respectively connected with the gas bag 2 and the experimental container 1.
The gas bag 2 can be used to contain nitrogen or an inert gas, and nitrogen is exemplified in the following examples.
The oil storage tank 15 is communicated with the inside of the experimental container 1 through a second pipeline, the two ends of the second pipeline are respectively connected with the oil storage tank 15 and the experimental container 1, the oil taking valve 16 is used for controlling the on-off between the oil storage tank 15 and the experimental container 1, and the on-off of the oil taking valve 16 is controlled to control the on-off between the oil storage tank 15 and the experimental container 1. The oil tank 15 also starts with an air hole and an air valve 14 connected to the air hole. When the insulation oil of natural ester in the oil storage tank 15 flows out, nitrogen or inert gas can be simultaneously filled into the oil storage tank 15 through the gas valve 14 and the gas hole.
The electrical fault device can be arranged inside the experimental container 1, and the electrical fault device can simulate an electrical fault.
The liquid sampling device 21 is used to draw a liquid sample from the test vessel 1. The liquid sampling device 21 may be a glass needle tube.
When the simulation device for detecting the dissolved gas in the oil under the insulating oil-electricity fault is applied, the air inlet valve 5 is firstly opened, the experiment container 1 is filled with nitrogen, and meanwhile, the air in the experiment container 1 is driven away. Then, closing the air inlet valve 5, opening the oil taking valve 16, filling natural ester insulating oil into the experimental container 1, and closing the oil taking valve 16 after the insulating oil soaks the inner wall of the experimental container 1 so as to rinse the experimental container 1. Specifically, the experimental container 1 may be slightly vibrated to make the natural ester insulating oil fully infiltrate the inner wall of the experimental container 1. The above-mentioned step of rinsing the test vessel 1 may be repeated 3-5 times to discharge the natural ester insulating oil used for rinsing, and the test vessel 1 is charged with nitrogen gas while discharging the natural ester insulating oil used for rinsing, so as to prevent air from entering the test vessel 1 to affect the test result. Then, the electrical fault device is installed in the experimental container 1, the oil extraction valve 16 is opened, and the natural ester insulating oil is filled into the experimental container 1 to realize sample loading. The electric fault device is started to simulate the electric fault, and the liquid sampling device 21 is used for extracting the liquid sample.
From the above, the simulation device for detecting the dissolved gas in the oil under the electrical fault of the insulating oil provided by the invention can simulate the electrical fault in the natural ester insulating oil in the experimental container 1, and extract the liquid sample for gas chromatography analysis, so as to realize the DGA analysis work based on the characteristics of the insulating oil under the condition of simulating the electrical fault, and form a complete experimental method.
Preferably, the electrical failure device comprises a first electrode 11 and a second electrode 12 which can be arranged in the laboratory vessel and are arranged opposite to each other. The first electrode 11 and the second electrode 12 are respectively connected with the positive electrode and the negative electrode of a power supply so as to realize the simulation of the power frequency breakdown electric fault in the oil.
The simulation device further comprises a first conductive connecting rod 22 penetrating through the top wall of the experiment container 1 and a second conductive connecting rod 23 penetrating through the bottom wall of the experiment container 1, wherein two ends of the first conductive rod are respectively arranged on the inner side and the outer side of the experiment container, and two ends of the first conductive rod are also respectively arranged on the inner side and the outer side of the experiment container. The first electrode 11 is fixed at the lower end of the first conductive connecting rod 22, and the second electrode 12 is fixed at the upper end of the second conductive connecting rod 23, so that the first electrode 11 and the second electrode 12 are respectively connected with the positive electrode and the negative electrode of the power supply through the first conductive rod and the second conductive rod.
Preferably, the height of the first electrode 11 and/or the second electrode 12 is adjustable, so that a suitable height of the first electrode 11 and/or the second electrode 12 can be selected depending on the simulated electrical failure. Specifically, a sleeve may be fixed on the experimental container 1, the first conducting rod or the second conducting rod passes through the sleeve, and the first conducting rod or the second conducting rod is in threaded connection or sliding connection with the sleeve, so that the first conducting rod or the second conducting rod slides up and down to a proper height. If the first conducting rod or the second conducting rod is connected with the sleeve in a sliding mode, after the first conducting rod or the second conducting rod slides to a proper height, the first conducting rod or the second conducting rod needs to be fixedly connected with the sleeve, and the first conducting rod or the second conducting rod can be abutted against the sleeve through the elastic bulge to achieve fixed connection of the first conducting rod and the sleeve. In order to prevent the detection result from being influenced, the first conducting rod or the second conducting rod is in sealing fit with the sleeve.
Further, the first electrode 11 may be a needle electrode or a ball electrode; the second electrode 12 may be a plate electrode. Of course, the first electrode 11 and the second electrode 12 may be other electrodes, and are not limited herein.
When two electrical faults of oil paper power frequency surface flashover and oil medium power frequency partial discharge need to be carried out, the second electrode 12 needs to be provided with the oil-immersed paper plate 24.
Specifically, as shown in fig. 7, when an operating frequency breakdown electric fault in oil is simulated, it is only necessary to mount the first electrode 11 and the second electrode 12 with a gap between the first electrode 11 and the second electrode 12. The distance between the first electrode 11 and the second electrode 12 is required to meet the experimental requirements. As shown in fig. 8, when simulating an oiled paper power frequency surface flashover electrical fault, the first electrode 11 and the second electrode 12 are installed, an oil-immersed paper board 24 needs to be arranged between the first electrode 11 and the second electrode 12, and the first electrode 11 and the second electrode 12 are respectively in contact with the upper side and the lower side of the oil-immersed paper board 24. As shown in fig. 9, when an operating frequency partial discharge electrical fault in oil is simulated, the first electrode 11 and the second electrode 12 are installed, an oil-immersed paper board 24 needs to be arranged between the first electrode 11 and the second electrode 12, the oil-immersed paper board 24 is in contact with the second electrode 12, a gap exists between the first electrode 11 and the oil-immersed paper board 24, the distance between the first electrode 11 and the oil-immersed paper board 24 needs to meet a test requirement, and the oil-immersed paper board 24 plays roles in blocking the development of a pour point and preventing a breakdown.
The electrical fault device can be detachably arranged in the test container 1, and thus the electrical fault device is installed after the rinsing step and before the sample loading step, or before the rinsing step.
After the cover plate 1b is opened, the electric fault device is installed in the experimental container 1, and after the installation is finished, the cover plate 1b is fixedly and hermetically connected with the container body 1 a.
In order to ensure that the insulating oil of the natural ester in the experimental container 1 is uniform, the simulation equipment further comprises a circulating oil pipe 19 and an oil pump 20 connected in series on the circulating oil pipe 19, and an inlet and an outlet of the circulating oil pipe 19 are communicated with the inside of the experimental container 1. In the S3 electrical failure step or after the S3 electrical failure step and before the S4 sampling, the oil pump 20 was turned on to circulate the insulating oil inside the experimental container 1. So can guarantee that the insulating oil of natural ester in the experimental container 1 is more even, avoided inhomogeneous influence testing result.
An air bag valve 3 can be arranged at the air outlet of the air bag 2, so that the air outlet of the air bag 2 is controlled by opening and closing the air bag valve 3.
The bottom of the experimental vessel 1 is provided with a flow port and the flow port is provided with a sealing valve 17, and the second pipeline, the liquid sampling device 21 and the circulating oil pipe 19 are all communicated with the inside of the experimental vessel 1 through the flow port. In the steps of S1 rinsing and S2 sample loading, the second line is connected to the circulation port to communicate the oil reservoir 15 with the test vessel 1. In step S3 electrical fault, the circulation oil pipe 19 is connected to the flow port to realize circulation flow of the natural ester insulating oil in the experimental vessel 1. In the sampling at step S4, the liquid sampling device 21 is connected to the flow port to perform the sampling.
The sealing valve 17 serves to seal the opening at the bottom of the test container 1.
The test container 1 is provided with an air vent for communicating with the first pipe 4, and the air intake valve 5 may be provided at the air vent. The vent may be provided at the top of the assay container 1. The take-up valve 16 may be provided at the outlet of the oil tank 15.
In the above embodiments, the simulation apparatus further includes a vacuum pump, a gas collection tank 10 and a gas sampling device 7, the gas collection tank 10 is connected to the exhaust port at the top of the experiment container 1 through the exhaust pipe 8, the gas sampling device 7 is used for extracting gas in the exhaust pipe 8 or the gas collection tank 10, and the vacuum pump is connected in series to the exhaust pipe 8.
With such an arrangement, Gas generation of the natural ester insulating oil in the experimental container 1 after electrical failure can be acquired, and a DGA (Dissolved Gas Analysis, DGA) Analysis technique based on the Gas generation characteristic of the insulating oil under the condition of electrical failure can be realized. The simulation equipment can be used for researching the gas production characteristics of the natural ester insulating oil under the condition of simulating electrical faults.
Preferably, a three-way valve 18 is further disposed on the exhaust pipeline 8, two of the flow ports of the three-way valve 18 are connected in series on the exhaust pipeline 8, and the other flow port of the three-way valve 18 is communicated with the gas sampling device 7. The gas sampling device 7 may also be a glass needle tube.
An isolation valve 9 is also connected in series on the exhaust pipeline 8, and the isolation valve 9 is positioned between the three-way valve 18 and the gas collection tank 10.
Of course, the gas sampling device 7 may directly sample the gas from the gas collection tank 10, and is not limited herein.
The simulation equipment for detecting the dissolved gas in the oil under the electric fault of the insulating oil can be used for carrying out a simulation experiment on the internal fault of the transformer and can comprehensively and accurately reflect the gas production rule of the insulating oil caused by the fault. A detailed embodiment of a simulation apparatus for detecting dissolved gas in oil under electrical fault of insulating oil using the above is provided as follows:
if the previous test oil sample exists in the test container 1 before the rinsing, the previous test oil sample is emptied. Then, the vessel body 1a is fixed to the holder 13, and the lid plate 1b is fixedly and hermetically connected to the vessel body 1 a. The air inlet valve 5 may be a sealing valve 17, and a vacuum valve 6 may be provided at an exhaust port at the top of the experimental container 1. The oil storage tank 15 is filled with pretreated test oil sample, protective nitrogen is filled in the oil storage tank 15 to enable the interior of the oil storage tank 15 to be balanced to an atmospheric pressure, the air bag valve 3, the oil taking valve 16 and the air valve 14 are all closed, and the air inlet valve 5, the vacuum valve 6 and the sealing valve 17 at the bottom circulation port of the test container 1, which are used for being communicated with the first pipeline 4, are all opened. The three-way valve 18 is opened until the experimental container 1 is communicated with the gas collection tank 10.
After the detection system is connected without errors, starting a vacuum pump, pumping the air pressure in the experimental container 1 to be below 80Pa, opening an oil taking valve 16 at an oil outlet of an oil storage tank 15 after the air pressure is finished, enabling an oil sample in the oil storage tank 15 to enter the experimental container 1 under the action of pressure, and closing the oil taking valve 16 after the oil injection is finished; after the oiling is completed, the air inlet valve 5, the vacuum valve 6 and the sealing valve 17 at the bottom flow opening are closed, the isolation valve 9 is closed, the connection between the experimental container 1 and the air bag 2 and the connection between the gas sample collection tank and the oil storage tank 15 are disconnected, at the moment, all the connections between the experimental container 1 and the outside are disconnected, the experimental container 1 is taken down from the support 13, the experimental container 1 is vibrated, the experimental oil sample is fully soaked on the inner wall of the experimental container 1, and the phenomenon that the oil sample splashes in the experimental container 1 and falls into the air inlet valve 5 and the vacuum valve 6 is avoided.
After rinsing is completed, the air inlet valve 5 is opened to allow air to be introduced into the tank, where the air inlet valve 5 may be connected to the first pipe 4 to allow nitrogen to be introduced, or the air inlet valve 5 may be connected to an air source to allow air to be introduced. And opening the sealing valve 17 to discharge the natural ester insulating oil after the moistening, repeating the moistening operation, and totally carrying out the moistening for 3-5 times until the natural ester insulating oil after the moistening meets the preset requirement, wherein the preset requirement can be the IEC 62770 and 2013 requirements, then taking down the cover plate 1b, and opening the container to prepare for installing the electrical fault device.
And opening the experimental container 1, installing an electrical fault device, selecting the type of the first electrode 11 according to the simulated electrical fault type and adjusting the distance between the first electrode 11 and the second electrode 12 during installation.
After the electric fault device is installed, the cover plate 1b is hermetically connected with the container body 1a, the system is connected, and the initial state of each valve is consistent with that of rinsing. Starting a vacuum pump to pump the air pressure of the experimental container 1 to be below 80 Pa; the vacuum valve 6 is closed, the air bag valve 3 is opened, the air bag valve 3 is closed after nitrogen is filled to one atmosphere, the vacuum valve 6 is opened again, the container is flushed by the nitrogen, and the flushing operation is repeated three times, so that the nitrogen replaces the residual air in the container.
After the washing is finished, pumping the experimental container 1 to be under 80Pa by air pressure, opening the oil taking valve 16, sucking the oil sample in the oil storage tank 15 into the container due to the negative pressure in the experimental container 1, filling sufficient oil sample into the experimental container 1, and closing the oil taking valve 16; opening the air bag valve 3, filling nitrogen into the experimental container 1 as protective gas and balancing the pressure difference between the inside and the outside, and then closing the air bag valve 3; the three valves of the air inlet valve 5, the vacuum valve 6 and the sealing valve 17 are closed, the isolating valve 9 is closed, and the connection of the container with the air bag 2, the gas sample collection tank and the oil storage tank 15 is disconnected; the container was removed and prepared for testing.
After the electric fault device is connected with a power supply, the electric fault can be simulated after the electric fault device is checked to be correct.
And collecting a fault sample for gas chromatography analysis after the fault simulation is completed. During sampling, the sealing valve 17 is connected with the glass needle tube for sampling in a sealing mode, the air inlet valve 5 is connected with the air bag 2, after the operation of taking the gas sample is completed, the vacuum valve 6 is closed, the air bag valve 3, the air inlet valve 5 and the sealing valve 17 are opened, and the glass needle tube is pulled to take 20-50mL of the liquid sample. Liquid sample can be gathered in experimental container 1 lower part to carry out gas chromatography, so can avoid the air to dissolve and introduce the error, whole operation needs go on under the isolated air condition. After the single group of the oil medium power frequency breakdown and oil medium power frequency surface flashover test is finished, standing for more than 30 minutes for re-sampling is needed, so that the generated fault gas is dissolved and balanced in the upper space and the lower oil sample of the experimental container, and the gas generated in the oil medium power frequency partial discharge test is distributed uniformly due to long duration, so that the sampling can be immediately carried out after the test is finished.
It should be noted that, when the in-oil power frequency breakdown test is performed, the first conductive connecting rod 22 and the second conductive connecting rod 23 are respectively connected with the positive end and the negative end of a voltage source, and the power is turned on and boosted until breakdown occurs after the test is correct, wherein the boosting rate is 2 kV/s. And 2 groups of breakdown tests are carried out on each insulating oil, the breakdown times are selected as control variables, each group is subjected to 5 times and 15 times of breakdown respectively, the next test is carried out after the each time of breakdown is kept stand for 2 minutes, and the sampling detection is carried out after each group of breakdown is carried out after the each group of breakdown is kept stand for 30 minutes.
When the industrial frequency breakdown test of the oil paper is carried out, 2 groups of breakdown of each insulating oil are carried out, the breakdown times are selected as control variables, each group is subjected to 5 times and 10 times of breakdown respectively, the oil paper is kept stand for 2 minutes after each breakdown and then is subjected to the next test, and each group is kept stand for 30 minutes after the breakdown is finished and then is subjected to sampling detection.
When performing the in-oil power frequency partial discharge test, firstly, the partial discharge detection equipment needs to be calibrated. And after the calibration is finished, the voltage source is turned on to boost the voltage to the partial discharge starting voltage. Each insulating oil is subjected to 2 groups of partial discharge tests, the discharge time is selected as a control variable, each group lasts for 15 hours and 30 hours respectively, and the samples are taken immediately after the partial discharge is finished each time.
In the embodiment, the test object is rapeseed-based natural ester insulating oil, mineral insulating oil is used for a comparison test, and each insulating oil is subjected to three types of electrical fault simulation tests of power frequency breakdown in oil, power frequency surface flashover of oilpaper and power frequency partial discharge in oil.
As mentioned above, the simulation test is carried out under the condition of air isolation, and the sample is isolated from the air in the whole process from sample loading to sampling, so that errors caused by air dissolution are avoided. Under the power frequency breakdown and partial discharge test, CO is introduced2As a characteristic gas in the case of electrical failure of natural ester insulating oils. Under a power frequency flashover test, CO is used as a characteristic gas under the electrical fault of the natural ester insulating oil.
Therefore, the simulation equipment for detecting the dissolved gas in the oil under the electrical fault of the insulating oil can be used for carrying out a fault simulation experiment device in the transformer, can simulate the electrical fault in the transformer, and can collect the gas escaping from the insulating oil in the experiment container 1 after the fault simulation is completed so as to analyze both an oil sample and a gas sample.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A simulation method for detecting dissolved gas in oil under the condition of insulating oil electrical fault is characterized by comprising the following steps:
rinsing, namely filling insulating oil into the experimental container (1), enabling the insulating oil to soak the inner wall of the experimental container (1), and then discharging the insulating oil in the experimental container (1);
filling a sample, namely filling insulating oil into the experimental container (1);
simulating an electrical fault in the insulating oil inside the test vessel (1);
sampling, namely extracting a preset amount of liquid sample from the experiment container (1);
and analyzing, namely performing gas chromatography analysis on the liquid sample.
2. The simulation method according to claim 1, wherein in the rinsing step, the filling of the test container (1) with the insulating oil is specifically: filling nitrogen or inert gas into the experimental container (1), extracting the gas in the experimental container (1) to reduce the air pressure in the experimental container (1) to a preset air pressure value, and filling insulating oil into the experimental container (1);
the specific steps of enabling the insulating oil to infiltrate the inner wall of the experimental container (1) are as follows: vibrating the experiment container (1) to enable insulating oil to infiltrate the inner wall of the experiment container (1);
the insulating oil discharged from the experimental container (1) is specifically as follows: discharging insulating oil in the experimental container (1) and simultaneously filling air, nitrogen or inert gas into the experimental container (1);
the rinsing step further comprises repeating the step 3-5 times.
3. The simulation method according to claim 1, wherein in the step of simulating the electrical fault, an oil-in-oil power frequency breakdown, an oil-in-paper power frequency surface flashover or an oil-in-oil power frequency partial discharge is performed in insulating oil in the experimental vessel (1).
4. The simulation method of claim 1, wherein in the sampling step: extracting a preset amount of liquid sample from the bottom of the experimental container (1);
the sampling step further comprises: extracting a preset volume of gas sample discharged from the experiment container (1);
the analyzing step further comprises: the gas sample is analyzed.
5. A simulation apparatus to which the simulation method for detecting dissolved gas in oil under electrical failure of an insulating oil according to claim 1 is applied, comprising:
the experimental container (1) is provided with an inner cavity, and the experimental container (1) comprises a container body (1a) and a cover plate (1b) detachably connected with the container body (1 a);
the air bag (2) is communicated with the interior of the experimental container (1) through a first pipeline (4), and the air inlet valve (5) is used for controlling the on-off between the air bag (2) and the experimental container (1);
the oil storage tank (15) is communicated with the inside of the experimental container (1) through a second pipeline, the oil taking valve (16) is used for controlling the connection and disconnection between the oil storage tank (15) and the experimental container (1), and the oil storage tank (15) is also provided with an air hole and an air valve (14) connected with the air hole;
an electrical fault device which can be arranged inside the test container (1) to simulate an electrical fault;
a liquid sampling device (21), the liquid sampling device (21) being used for extracting a liquid sample from the experiment container (1).
6. Simulation device according to claim 5, wherein the electrical fault means comprise a first electrode (11) and a second electrode (12) which can be arranged in the laboratory vessel (1) and are arranged opposite each other;
the simulation equipment further comprises a first conductive connecting rod (22) penetrating through the top wall of the experiment container (1) and a second conductive connecting rod (23) penetrating through the bottom wall of the experiment container (1), wherein the first electrode (11) is fixed at the lower end of the first conductive connecting rod (22), and the second electrode (12) is fixed at the upper end of the second conductive connecting rod (23);
the height of the first electrode (11) and/or the second electrode (12) is adjustable.
7. Simulation device according to claim 6, wherein the first electrode (11) is a needle electrode or a ball electrode;
the second electrode (12) is a plate electrode.
8. Simulation device according to claim 5, wherein a gas bag valve (3) is provided at the gas outlet of the gas bag (2);
the bottom of the experiment container (1) is provided with a circulation port, a sealing valve (17) is arranged at the circulation port, and the second pipeline and the liquid sampling device (21) are communicated with the inside of the experiment container (1) through the circulation port.
9. Simulation apparatus according to any of the claims 5-8, further comprising a vacuum pump, a gas collection tank (10) and a gas sampling device (7), wherein the gas collection tank (10) is connected with a gas outlet at the top of the laboratory vessel (1) through a gas exhaust line (8), the gas sampling device (7) is used for extracting gas in the gas exhaust line (8) or the gas collection tank (10), and the vacuum pump is connected in series with the gas exhaust line (8).
10. Simulation plant according to claim 9, wherein a three-way valve (18) is also arranged on the exhaust line (8), two of the flow ports of the three-way valve (18) being connected in series on the exhaust line (8) and the other flow port being in communication with the gas sampling device (7).
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| CN113253067A (en) * | 2021-05-12 | 2021-08-13 | 国网安徽省电力有限公司电力科学研究院 | Method and system for correcting gas production rate of transformer insulating oil partial discharge simulation test |
| CN113253067B (en) * | 2021-05-12 | 2022-08-12 | 国网安徽省电力有限公司电力科学研究院 | Method and system for correcting gas production rate of transformer insulating oil partial discharge simulation test |
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