CN110703061A - Mixed insulating oil local thermal fault gas production rule simulation test device - Google Patents
Mixed insulating oil local thermal fault gas production rule simulation test device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
Abstract
A simulation test device for gas production rule of local thermal fault of mixed insulating oil relates to the field of high-voltage electrical equipment insulation. It includes plant insulating oil reservoir, mineral insulating oil reservoir, experimental sample oil reservoir, first oil blender, second oil blender, high temperature furnace and waste oil receiving flask. The mixed oil has high proportional accuracy; no gas generated by fault is dissipated; and oil at the initial stage of the test is drained, so that the accuracy of the test result is ensured. The flow is controlled in a centralized way, so that the operation is convenient; the check valve prevents the oil flow from rapidly increasing in temperature after entering the high-temperature furnace to cause damage to the system due to rapid pressure increase. The device has the advantages of simple structure, high mixed oil preparation speed, uniform mixing, more actual temperature and type generated by overheating faults, accurate and reliable test and research results, and solves the problem of research on the characteristic gas generation rule of the mixed insulating oil under the action of heat energy. The device is suitable for the simulation test of the gas production rule of the local thermal fault of the mixed insulating oil.
Description
Technical Field
The invention relates to the field of high-voltage electrical equipment insulation, in particular to a simulation test device for a gas production rule of a local thermal fault of mixed insulating oil.
Background
A large amount of insulating oil is used in power grid equipment, and the insulating oil is mainly used for high-voltage electrical equipment such as transformers, reactors, circuit breakers, transformers, sleeves, cables and the like, and plays roles in insulation, cooling, heat dissipation and arc extinction. Common insulating oils are mineral insulating oils, synthetic insulating oils (e.g., silicone oils, alpha oils, beta oils, synthetic esters, etc.), natural ester insulating oils, mixed insulating oils, and the like. Based on the characteristics of low viscosity, low freezing point and high oxidation resistance of mineral insulating oil and high ignition point, high aging resistance and complete degradation of vegetable insulating oil, the mineral insulating oil and the vegetable insulating oil are usually mixed to form new mixed insulating oil, and the application performance of the new mixed insulating oil is improved so as to meet the requirements of high-voltage power equipment with high-grade requirements on fire safety, such as mines, residential areas, military facilities, high-rise buildings and the like.
Practice proves that when the operating mineral insulating oil high-voltage electrical equipment bears abnormal overheating and the action of an electric field, characteristic combustible gases (such as hydrogen, methane, ethylene, ethane, acetylene and the like) are generated and mostly dissolved in oil, so that the internal latent fault of the high-voltage electrical equipment can be diagnosed by utilizing a Dissolved Gas Analysis (DGA) technology in the oil, the technology has been successfully applied in the power industry for nearly 50 years, and great contribution is made to safe operation of a power grid. The main components of the mineral insulating oil are alkane, cycloparaffin and aromatic hydrocarbon, the main component of the vegetable insulating oil is fatty acid triglyceride, the molecular composition and the structure of the two are greatly different, and the characteristic gas generation rules under the action of the same temperature are greatly different. In recent years, with the application of the plant insulating oil transformer, some researches are made on the gas production rule of the plant insulating oil under the fault condition, but a large amount of test data is still required to be accumulated to perfect a fault diagnosis method; however, no research report for the mixed insulating oil exists at present, so that research on the characteristic gas generation rule of the mixed insulating oil under the action of heat energy needs to be carried out, and a reliable basis is provided for the overheat fault diagnosis in the operation of the mixed insulating oil high-voltage electrical equipment.
On one hand, the research on the characteristic gas generation rule of the mixed insulating oil under the action of heat energy is a difficult task, and on the other hand, the composition proportion of the mixed insulating oil in practical application is different, and the gas generation rule is also different, so that the test is required to be carried out according to the practical composition proportion; on the other hand, the whole oil is not overheated at high temperature when the transformer is operated, and equipment faults are caused by local overheating, so that local overheating points need to be simulated; thirdly, the ignition point of the mineral oil is about 160 ℃, the ignition point of the vegetable insulating oil is about 330 ℃, and when the oil temperature exceeds the ignition point, the fire danger is easy to occur.
Patent ZL201510020765.6 discloses an insulating oil overheating fault simulation test device, which can only carry out the test of insulating oil with a single composition ratio and cannot conveniently and quickly realize the test research of insulating oil with different composition ratios; the device adopts the heating ring as a superheating source, and the superheating contact area is much larger than the oil mass in the test device and is not in accordance with the actual working condition; most importantly, the overheating source heats the whole oil in the testing device, and the oil temperature of the contact surface of the overheating source and the heat source is far lower than that of the heat source, so that the testing conclusion is greatly deviated.
Patent 201810933546.0 discloses a transformer internal fault simulation experiment device, which sets up the hot spot inside the device, but still heats the whole insulating oil in the device, the temperature thermocouple 14 is closely connected with two heating plates, the measured temperature is the temperature in the heating plates, and the oil temperature of the contact surface with the heating plates is still far less than the temperature measured by the thermocouple 14, resulting in the great deviation of the experimental conclusion.
Patent ZL201420228809.5 discloses a transformer thermal fault simulation device, which realizes the occurrence of high-temperature hot spots through a heater, and the temperature of oil flow in an oil paper container 3 is the same as that of the heater; however, this device has the following problems: firstly, only the test of the insulating oil with a single composition ratio can be carried out, and the test research of the insulating oil with different composition ratios cannot be conveniently and rapidly realized; the check valve is not arranged on the oil flow pipeline of the device, and when oil flows through the heater at high temperature, the pressure in the oil pipeline rises and the oil flows back instantaneously due to sharp temperature rise and decomposition; thirdly, the oil container 2 has a small volume, the oil flowing out of the heater enters from the top of the oil container, and most of low-molecular combustible gas generated by high-temperature decomposition of the oil escapes without being dissolved in the oil, so that the test result is seriously deviated. Therefore, research work on the characteristic gas generation rule of the mixed insulating oil under the action of heat energy needs to be carried out urgently, and a corresponding simulation test device is needed urgently to ensure the accuracy and reliability of research results.
Disclosure of Invention
The invention aims to provide a simulation test device for a gas production rule of a local thermal fault of mixed insulating oil.
A mixed insulating oil local thermal fault gas production law simulation test device comprises a plant insulating oil storage, a mineral insulating oil storage, a test sample oil storage, a first oil mixer, a second oil mixer, a high-temperature furnace and a waste oil collecting bottle;
an oil outlet of the plant insulating oil reservoir 1 and an oil outlet of the mineral insulating oil reservoir 2 are respectively communicated with an oil inlet of the first oil mixer;
a first peristaltic pump and a first flowmeter are sequentially arranged between the plant insulating oil storage and the first oil mixer;
a second peristaltic pump and a second flowmeter are sequentially arranged between the mineral insulating oil storage and the first oil mixer;
the oil outlet of the first oil mixer is respectively communicated with the oil inlets of a third flow meter and a fourth flow meter;
an oil inlet of the second oil mixer is respectively communicated with oil outlets of a third flow meter and a fourth flow meter;
a check valve and a high-temperature furnace are sequentially arranged between the third flow meter and the second oil mixer;
an oil outlet of the second oil mixer is communicated with an oil inlet of the test sample oil storage;
the mixed insulating oil local thermal fault gas production law simulation test device comprises a first peristaltic pump, a second peristaltic pump, a gas production system and a gas production system, wherein the first peristaltic pump and the second peristaltic pump are connected through pipelines;
the length of the high-temperature resistant stainless steel pipe flowing through the high-temperature furnace is 100 mm;
a flow regulating valve is arranged between the first oil mixer and the fourth flowmeter;
a waste oil collecting bottle is arranged between the second oil mixer and the test sample oil storage device and is controlled by an inlet oil drain valve;
the first flowmeter, the second flowmeter, the third flowmeter and the fourth flowmeter are all provided with standard RS485 communication interfaces and are electrically connected with the flow centralized controller to control the flow;
the rated oil filling amount of the plant insulating oil storage device is 20.0L;
the rated oil filling amount of the mineral insulating oil storage is 20.0L;
the rated fill volume of the test sample oil reservoir was 5.0L.
The invention has the following advantages and beneficial effects:
1. according to the mixed insulating oil local thermal fault gas production rule simulation test device, the flow centralized controller is adopted to control each flowmeter, so that the high proportion accuracy of the mixed oil components with different proportions is ensured; heating local oil flow by using a high-temperature furnace to simulate local overheating faults, and respectively storing mineral insulating oil, vegetable insulating oil and mixed test sample oil by using a fully-closed oil storage device to ensure that no gas generated by the faults escapes; before the test sample oil enters the test sample oil storage device, the oil at the initial stage of the test is drained through the arranged waste oil collecting bottle, and the accuracy of the test result is ensured.
2. According to the mixed insulating oil local thermal fault gas production law simulation test device, the flow of each path of oil flow is controlled in a centralized manner, and the operation is convenient; a check valve is arranged on an oil flow pipeline entering the high-temperature furnace, so that the damage to a system caused by rapid pressure increase due to rapid temperature rise after oil flow enters the high-temperature furnace is prevented; and a flow regulating valve is arranged on the bypass to ensure that the flow of the mixed oil entering the high-temperature furnace meets the requirement.
3. The mixed insulating oil local thermal fault gas production law simulation test device is simple in structure, high in mixed oil preparation speed and uniform in mixing, the temperature and the type of the overheat fault are closer to actual, the test research result is accurate and reliable, and the problem of research on the characteristic gas production law of the mixed insulating oil under the action of heat energy is solved.
The device is suitable for the simulation test of the gas production rule of the local thermal fault of the mixed insulating oil.
Drawings
Fig. 1 is a schematic structural diagram of a mixed insulating oil local thermal fault gas generation law simulation test device in the invention, wherein 1 represents a plant insulating oil storage, 2 represents a mineral insulating oil storage, 3 represents a test sample oil storage, 4 represents a first oil mixer, 5 represents a second oil mixer, 6 represents a high-temperature furnace, 7 represents a waste oil collecting bottle, 8 represents a first peristaltic pump, 9 represents a first flowmeter, 10 represents a second peristaltic pump, 11 represents a second flowmeter, 12 represents a third flowmeter, 13 represents a fourth flowmeter, 14 represents a one-way valve, 15 represents a flow regulating valve, and 16 represents an inlet oil drain valve.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first embodiment is as follows: referring to fig. 1, a simulation test device for local thermal fault gas generation law of mixed insulating oil according to the present embodiment includes a plant insulating oil storage 1, a mineral insulating oil storage 2, a test sample oil storage 3, a first oil mixer 4, a second oil mixer 5, a high temperature furnace 6, and a waste oil collecting bottle 7;
an oil outlet of the plant insulating oil reservoir 1 and an oil outlet of the mineral insulating oil reservoir 2 are respectively communicated with an oil inlet of the first oil mixer 4;
a first peristaltic pump 8 and a first flow meter 9 are sequentially arranged between the plant insulating oil reservoir 1 and the first oil mixer 4;
a second peristaltic pump 10 and a second flowmeter 11 are sequentially arranged between the mineral insulating oil storage 2 and the first oil mixer 4;
the oil outlet of the first oil mixer 4 is respectively communicated with the oil inlets of a third flow meter 12 and a fourth flow meter 13;
an oil inlet of the second oil mixer 5 is respectively communicated with oil outlets of a third flow meter 12 and a fourth flow meter 13;
a check valve 14 and a high-temperature furnace 6 are sequentially arranged between the third flow meter 12 and the second oil mixer 5;
the oil outlet of the second oil mixer 5 is communicated with the oil inlet of the test sample oil reservoir 3.
In the embodiment, the plant insulating oil storage, the mineral insulating oil storage and the test sample oil storage are all air-filled piston type stainless steel containers; the three oil reservoirs divide the container into an upper air chamber and a lower oil chamber through a sealing piston; the air chamber is respectively provided with an inflation inlet and a gas pressure gauge, and the bottom of the oil chamber is respectively provided with an oil injection inlet and an oil outlet; the gas chamber is filled with nitrogen with certain pressure, when no oil exists in the oil chamber, the piston moves to the bottom of the oil chamber under the action of the air pressure of the gas chamber, and the gas pressure in the gas chamber is 0.05 MPa; after oil is injected into the oil chamber, the oil entering the oil chamber pushes the piston to move upwards, gas in the air chamber is compressed, the pressure is increased, when the gas pressure is increased to 0.1MPa, the oil injection is stopped, and at the moment, the oil amount in the container is the rated oil injection amount of the oil storage device.
In this embodiment, the first oil mixer 4 and the second oil mixer 5 are both helical blade type tubular mixers made of stainless steel, the pipe diameter is 15mm, the length is 250mm, and the fluid flow is 800L/h.
In the high temperature furnace 6 of the present embodiment, the maximum temperature: 1200 ℃; the heating rate is as follows: more than or equal to 10 ℃/min; the use temperature is as follows: RT + 50-1100 ℃; temperature control precision: plus or minus 1 ℃; hearth material: a refractory brick; the volume of the hearth is as follows: 4.0L; power: 2.5 kW; heating element: a nickel chromium wire.
In the present embodiment, the first peristaltic pump 8 and the second peristaltic pump 10 have a rotation speed range: 0.1 rpm-100 rpm, reversible positive and negative rotation; resolution ratio of rotation speed adjustment: 0.1 rpm; flow range: 0.001 mL/min-380 mL/min; hose outside diameter: 6 mm; wall thickness of the hose: 1.0 mm.
In the present embodiment, the check valve 14 has an opening pressure: 0.05MPa, drift diameter: 6mm, material quality: 316L stainless steel.
In the embodiment, the mixed insulating oil local thermal fault gas production rule simulation test device is used for performing the characteristic gas production rule test of the mixed insulating oil under the action of heat energy according to the following operations:
(1) respectively injecting mineral insulating oil and vegetable insulating oil for test into a mineral insulating oil storage 2 and a vegetable insulating oil storage 1, standing for 30min, and sampling to determine the content of dissolved gas components such as hydrogen, methane, ethylene, ethane, acetylene, carbon monoxide and carbon dioxide in the oil for test according to the requirements of GBT7252-2001 'guide rule for analysis and judgment of dissolved gas in transformer oil';
(2) setting the test temperature of the high-temperature furnace 6 according to the test requirement; setting the flow rate of mineral insulating oil (a first flow meter 9) and the flow rate of vegetable insulating oil (a second flow meter 11) according to the proportion of the mixed oil, and controlling the total flow rate of the mixed oil to be 100 mL/min; setting the flow rate (third flow meter 12) of the superheated mixed oil entering the high-temperature furnace to be 5mL/min, and setting the flow rate (fourth flow meter 13) of the superheated mixed oil to be 95 mL/min;
(3) after the temperature in the high-temperature furnace 6 is stabilized to a set value, respectively opening outlet valves of the mineral insulating oil storage 2 and the plant insulating oil storage 1, starting the first peristaltic pump 8 and the second peristaltic pump 10, opening exhaust ports of the first flowmeter 9, the second flowmeter 11 and the third flowmeter 12, after oil flows out of the exhaust ports, closing the exhaust ports, and adjusting the fourth flowmeter 13 to ensure that the flow rate of the hot mixed oil can meet the requirement of 5 mL/min;
(4) opening an inlet oil discharge valve 16 of the waste oil collecting bottle 7, opening an inlet valve of the test sample oil storage 3 after the volume of oil in the waste oil collecting bottle 7 is more than 300mL, closing the inlet oil discharge valve 16 of the waste oil collecting bottle 7 to enable the test sample oil to enter the test sample oil storage 3, stopping the first peristaltic pump 8 and the second peristaltic pump 10 when the gas pressure in the test sample oil storage 3 reaches 0.1MPa, closing corresponding valves, and completing the oil local overheating test;
(5) and (3) standing for 30min, taking a test sample oil sample according to the requirements of GBT7252-2001, namely analysis and judgment guide rules for dissolved gas in transformer oil, measuring the content of dissolved gas components in the oil sample, comparing the content with the detection result of the test oil in the step (1), and analyzing the characteristic gas generation rule of the mixed insulating oil under the condition of local high-temperature overheating.
The second embodiment is as follows: the difference between the present embodiment and the specific embodiment is that the connecting pipelines of each device in the mixed insulating oil local thermal fault gas production law simulation test device are all high temperature resistant stainless steel pipes except that the inlet and outlet pipelines of the first peristaltic pump 8 and the second peristaltic pump 10 are both hoses. Other steps and parameters are the same as those in the first embodiment.
The high-temperature resistant stainless steel pipe of the embodiment is stainless steel (GH 600); pipe diameter and outer diameter: 6 mm; pipe diameter and inner diameter: 3 mm.
The third concrete implementation mode: the present embodiment is different from the first embodiment in that the length of the high temperature resistant stainless steel pipe flowing through the high temperature furnace 6 is 90 to 110 mm. Other steps and parameters are the same as those in the first embodiment.
The fourth concrete implementation mode: in the present embodiment, unlike the first embodiment, a flow rate control valve 15 is provided between the first oil mixer 4 and the fourth flow meter 13. Other steps and parameters are the same as those in the first embodiment.
In the present embodiment, the flow rate control valve 15 has a nominal pressure: 1.6 MPa; the material is as follows: 316L; sealing and filling: polytetrafluoroethylene; caliber: 1/4 inches.
The fifth concrete implementation mode: unlike the first embodiment, a waste oil collection bottle 7 is provided between the second oil mixer 5 and the test sample oil reservoir 3 and is controlled by an inlet drain valve 16. Other steps and parameters are the same as those in the first embodiment.
In the embodiment, the waste oil collecting bottle 7 is made of glass; volume: 500 mL; has scales.
In this embodiment, a waste oil collecting bottle 7 is provided, and an inlet oil drain valve 16 is provided to drain oil at the initial stage of the test, thereby ensuring the accuracy of the test result.
The sixth specific implementation mode: the difference between the present embodiment and the first embodiment is that the first flow meter 9, the second flow meter 11, the third flow meter 12, and the fourth flow meter 13 are all provided with a standard RS485 communication interface, and are electrically connected to a flow centralized controller to control the flow rate. Other steps and parameters are the same as those in the first embodiment.
The precision of the four flow meters in the embodiment determines the important factor of the proportional accuracy of the mixed oil, so that a high-performance stainless steel (316L) mass flow controller is adopted, the flow control precision is +/-1.5% of S.P. (greater than or equal to 35% F.S >) and +/-1.0% of F.S. (< 35% F.S.), the measurement ranges are 0-30 mL/min and 0-100 mL/min, the range adjustable ratio is 50:1, the working pressure is less than or equal to 1.0MPa, and the drift diameter is 6 mm.
In the embodiment, the flow centralized controller mainly comprises a power supply, a CPU, an RS232 serial port, a 12C-to-RS 485 serial port, a flow acquisition circuit and a touch screen circuit; the CPU adopts an 8-bit AVR microprocessor ATmegal6L with low power consumption to realize the linkage coordination work of each part of the circuit system; the power supply part adopts LM2575 and AMSl 117 step-down switching power supply chips to provide 24V direct current voltage and 5V and 3.3V working voltage required by the circuit board; an AD7793 chip is adopted by the flow acquisition circuit; the touch screen adopts an intelligent display terminal DMT48270S043_01N, a 4.3-inch true color liquid crystal screen and 480 multiplied by 272 resolution, supports various text formats and RS232 serial port communication; and the flow is controlled through the RS485 serial port.
The seventh embodiment: the difference between the present embodiment and the first embodiment is that the rated oil filling amount of the vegetable insulating oil storage tank 1 is 20.0L. Other steps and parameters are the same as those in the first embodiment.
The specific implementation mode is eight: the difference between this embodiment and the first embodiment is that the rated oil filling amount of the mineral insulating oil storage 2 is 20.0L. Other steps and parameters are the same as those in the first embodiment.
The specific implementation method nine: in contrast to the first embodiment, the rated filling quantity of the test sample oil reservoir 3 is 5.0L. Other steps and parameters are the same as those in the first embodiment.
Example (b):
referring to fig. 1, the mixed insulating oil local thermal fault gas production law simulation test device includes a plant insulating oil storage 1, a mineral insulating oil storage 2, a test sample oil storage 3, a first oil mixer 4, a second oil mixer 5, a high-temperature furnace 6 and a waste oil collecting bottle 7;
an oil outlet of the plant insulating oil reservoir 1 and an oil outlet of the mineral insulating oil reservoir 2 are respectively communicated with an oil inlet of the first oil mixer 4;
a first peristaltic pump 8 and a first flow meter 9 are sequentially arranged between the plant insulating oil reservoir 1 and the first oil mixer 4;
a second peristaltic pump 10 and a second flowmeter 11 are sequentially arranged between the mineral insulating oil storage 2 and the first oil mixer 4;
the oil outlet of the first oil mixer 4 is respectively communicated with the oil inlets of a third flow meter 12 and a fourth flow meter 13;
an oil inlet of the second oil mixer 5 is respectively communicated with oil outlets of a third flow meter 12 and a fourth flow meter 13;
a check valve 14 and a high-temperature furnace 6 are sequentially arranged between the third flow meter 12 and the second oil mixer 5;
the oil outlet of the second oil mixer 5 is communicated with the oil inlet of the test sample oil reservoir 3;
the mixed insulating oil local thermal fault gas production law simulation test device comprises a connecting pipeline of each device, wherein except that inlet and outlet pipelines of a first peristaltic pump 8 and a second peristaltic pump 10 are both hoses, and other pipelines are all high-temperature-resistant stainless steel pipes;
the length of the high-temperature resistant stainless steel pipe flowing through the high-temperature furnace 6 is 100 mm;
a flow regulating valve 15 is arranged between the first oil mixer 4 and the fourth flowmeter 13;
a waste oil collecting bottle 7 is arranged between the second oil mixer 5 and the test sample oil storage 3 and is controlled by an inlet oil drain valve 16;
the first flowmeter 9, the second flowmeter 11, the third flowmeter 12 and the fourth flowmeter 13 are all provided with standard RS485 communication interfaces and are electrically connected with the flow centralized controller to control the flow;
the rated oil filling amount of the plant insulating oil storage device 1 is 20.0L;
the rated oil filling amount of the mineral insulating oil storage 2 is 20.0L;
the test sample oil reservoir 3 is rated for 5.0L of oil fill.
In this embodiment, the mixed insulating oil local thermal fault gas production law simulation test device is performed according to the following operations when performing a characteristic gas production law test of the mixed insulating oil under the action of heat energy:
(1) respectively injecting mineral insulating oil and vegetable insulating oil for test into a mineral insulating oil storage 2 and a vegetable insulating oil storage 1, standing for 30min, and sampling to determine the content of dissolved gas components such as hydrogen, methane, ethylene, ethane, acetylene, carbon monoxide and carbon dioxide in the oil for test according to the requirements of GBT7252-2001 'guide rule for analysis and judgment of dissolved gas in transformer oil';
(2) setting the test temperature of the high-temperature furnace 6 according to the test requirement; setting the flow rate of mineral insulating oil (a first flow meter 9) and the flow rate of vegetable insulating oil (a second flow meter 11) according to the proportion of the mixed oil, and controlling the total flow rate of the mixed oil to be 100 mL/min; setting the flow rate (third flow meter 12) of the superheated mixed oil entering the high-temperature furnace to be 5mL/min, and setting the flow rate (fourth flow meter 13) of the superheated mixed oil to be 95 mL/min;
(3) after the temperature in the high-temperature furnace 6 is stabilized to a set value, respectively opening outlet valves of the mineral insulating oil storage 2 and the plant insulating oil storage 1, starting the first peristaltic pump 8 and the second peristaltic pump 10, opening exhaust ports of the first flowmeter 9, the second flowmeter 11 and the third flowmeter 12, after oil flows out of the exhaust ports, closing the exhaust ports, and adjusting the fourth flowmeter 13 to ensure that the flow rate of the hot mixed oil can meet the requirement of 5 mL/min;
(4) opening an inlet oil discharge valve 16 of the waste oil collecting bottle 7, opening an inlet valve of the test sample oil storage 3 after the volume of oil in the waste oil collecting bottle 7 is more than 300mL, closing the inlet oil discharge valve 16 of the waste oil collecting bottle 7 to enable the test sample oil to enter the test sample oil storage 3, stopping the first peristaltic pump 8 and the second peristaltic pump 10 when the gas pressure in the test sample oil storage 3 reaches 0.1MPa, closing corresponding valves, and completing the oil local overheating test;
(5) and (3) standing for 30min, taking a test sample oil sample according to the requirements of GBT7252-2001, namely analysis and judgment guide rules for dissolved gas in transformer oil, measuring the content of dissolved gas components in the oil sample, comparing the content with the detection result of the test oil in the step (1), and analyzing the characteristic gas generation rule of the mixed insulating oil under the condition of local high-temperature overheating.
In the embodiment, the flow centralized controller is adopted to control each flowmeter, so that the high proportion accuracy of the mixed oil with different proportions is ensured; heating local oil flow by using a high-temperature furnace to simulate local overheating faults, and respectively storing mineral insulating oil, vegetable insulating oil and mixed test sample oil by using a fully-closed oil storage device to ensure that no gas generated by the faults escapes; before the test sample oil enters the test sample oil storage device, the oil at the initial stage of the test is drained through the arranged waste oil collecting bottle, and the accuracy of the test result is ensured.
In the embodiment, the flow of each oil flow is controlled in a centralized manner, so that the operation is convenient; a check valve is arranged on an oil flow pipeline entering the high-temperature furnace, so that the damage to a system caused by rapid pressure increase due to rapid temperature rise after oil flow enters the high-temperature furnace is prevented; and a flow regulating valve is arranged on the bypass to ensure that the flow of the mixed oil entering the high-temperature furnace meets the requirement.
The test device in the embodiment has the advantages of simple structure, high speed of mixed oil preparation, uniform mixing, more actual temperature and type generated by overheating faults, accurate and reliable test research results, and capability of solving the problem of research on the characteristic gas generation rule of the mixed insulating oil under the action of heat energy.
Claims (9)
1. A simulation test device for local thermal fault gas production rule of mixed insulating oil is characterized by comprising a plant insulating oil storage (1), a mineral insulating oil storage (2), a test sample oil storage (3), a first oil mixer (4), a second oil mixer (5), a high-temperature furnace (6) and a waste oil collecting bottle (7);
an oil outlet of the plant insulating oil storage 1 and an oil outlet of the mineral insulating oil storage (2) are respectively communicated with an oil inlet of the first oil mixer (4);
a first peristaltic pump (8) and a first flowmeter (9) are sequentially arranged between the plant insulating oil reservoir (1) and the first oil mixer (4);
a second peristaltic pump (10) and a second flowmeter (11) are sequentially arranged between the mineral insulating oil storage (2) and the first oil mixer (4);
an oil outlet of the first oil mixer (4) is respectively communicated with oil inlets of a third flow meter (12) and a fourth flow meter (13);
an oil inlet of the second oil mixer (5) is respectively communicated with oil outlets of a third flow meter (12) and a fourth flow meter (13);
a check valve (14) and a high-temperature furnace (6) are sequentially arranged between the third flow meter (12) and the second oil mixer (5);
the oil outlet of the second oil mixer (5) is communicated with the oil inlet of the test sample oil storage (3).
2. The gas production law simulation test device for the local thermal fault of the mixed insulating oil according to claim 1, wherein the inlet and outlet pipelines of the first peristaltic pump (8) and the second peristaltic pump (10) are both hoses, and the other pipelines are all high-temperature-resistant stainless steel pipes.
3. The gas production law simulation test device for the local thermal fault of the mixed insulating oil according to claim 1, wherein the length of the high-temperature resistant stainless steel tube flowing through the high-temperature furnace (6) is 90-110 mm.
4. The gas production law simulation test device for the local thermal fault of the mixed insulating oil according to claim 1, wherein a flow regulating valve (15) is arranged between the first oil mixer (4) and the fourth flowmeter (13).
5. The gas production law simulation test device according to claim 1, wherein a waste oil collecting bottle (7) is arranged between the second oil mixer (5) and the test sample oil storage (3) and is controlled by an inlet oil drain valve (16).
6. The mixed insulating oil local thermal fault gas generation law simulation test device according to claim 1, wherein the first flowmeter (9), the second flowmeter (11), the third flowmeter (12) and the fourth flowmeter (13) are provided with standard RS485 communication interfaces and are electrically connected with a flow centralized controller to control the flow.
7. The gas production law simulation test device for the local thermal fault of the mixed insulating oil according to claim 1, wherein the rated oil filling amount of the plant insulating oil storage (1) is 20.0L.
8. The gas production law simulation test device for the local thermal fault of the mixed insulating oil according to claim 1, wherein the rated oil filling amount of the mineral insulating oil storage (2) is 20.0L.
9. The gas production law simulation test device for the local thermal fault of the mixed insulating oil according to claim 1, wherein the rated oil filling amount of the test sample oil storage (3) is 5.0L.
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| CN201911142688.6A CN110703061B (en) | 2019-11-20 | 2019-11-20 | Mixed insulating oil local thermal fault gas production rule simulation test device |
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