Simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer

Abstract

A simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer belongs to the technical field of power equipment insulation state detection. The present invention aims to solve the problem that the oil samples inside existing transformers are affected by oil flow and temperature difference, resulting in significant differences in the contents of chemical markers at different positions, leading to inaccurate assessment of the insulation state of insulating paper. It includes: an oil sampling port is opened at the top of the oil tank, and an oil sampling probe samples and detects the content of chemical markers through the oil sampling port; the transformer oil heating module includes three temperature control units, which are arranged in the high-level area, middle-level area, and low-level area of the oil tank; the simulation circulation module uses a spiral stirrer installed on the inner side wall of the oil tank, and drainage ports are opened at the bottom and top of the oil tank, and an oil pipeline is connected between the drainage ports. A controllable flow rate pump is installed on the oil pipeline passage, and the spiral stirrer and the controllable flow rate pump are driven by a driving motor. The present invention is used to simulate the working state of a transformer and realize the simulation detection of the contents of chemical markers in oil at different positions.

Description

Technical Field

[0001] The present invention relates to a simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer, and belongs to the technical field of insulation condition detection of power equipment. Background Art

[0002] Power transformers are key equipment in the power transmission and transformation system. Improving the safety and reliability of power transformers is an important part of the power industry. Due to the many advantages of oil-immersed transformers, such as energy conservation, low noise, high reliability, and large capacity, most of the currently operating transformers are oil-immersed transformers, and their insulation systems are composed of insulating oil and insulating paper. During the operation of the transformer, the insulating paper and insulating oil will gradually age under the influence of factors such as temperature and oxygen. Although the transformer oil can be replaced during regular overhauls, since it is relatively difficult and extremely costly to replace the insulating paper, the insulating paper of the transformer can always not be replaced. The insulating paper becomes the weak point of the oil-paper insulation system, making the service life of the transformer mainly depend on the aging degree of the insulating paper. The aging degree of the insulating paper in an oil-immersed transformer increases with the increase of the operation time of the transformer. The aging degree of the insulating paper will affect the reliability of the transformer operation. Therefore, it is necessary to detect and evaluate the aging state of the insulating paper of the transformer in real time.

[0003] The current on-line evaluation technology for the insulation state of transformer insulating paper mainly evaluates the operation state of the insulating paper by sampling and inspecting the concentrations of various chemical markers (such as organic gas compounds like furfural, methanol, and carbon oxides) in the transformer oil. The chemical markers in the oil are by-products of the aging and degradation of the transformer insulating paper. The concentration of such chemical markers in the transformer oil is easily affected by factors such as oil temperature and water content in the oil, which in turn leads to inaccurate evaluation results.

[0004] The main heat source of the transformer is the winding. The oil temperature is relatively high near the winding, while the oil temperature is relatively low at places far from the winding. The density of high-temperature oil is lower, and the density of low-temperature oil is higher, which will form an oil flow circulation effect inside the tank. Due to the dual effects of oil flow and temperature on the chemical markers in the oil, the concentration distribution of the chemical characteristic quantities inside the transformer tank is relatively complex and non-uniform. Usually, the oil outlet for pumping oil inspection of the transformer is located at the lower part of the transformer tank. Due to the influence of temperature and oil flow, the content of chemical markers in the oil sample taken from this place is different from that at other positions (such as near the winding, the upper part of the transformer, etc.), and sometimes the difference is even large, affecting the evaluation result.

[0005] Therefore, due to the influence of oil flow and temperature difference inside the transformer, the content of chemical markers in the oil at the transformer oil pumping port is quite different from that at other positions, and an experimental device with a non-uniform temperature field and oil flow function is needed. Summary of the Invention

[0006] The object of the present invention is to solve the problem that the chemical marker content at different positions in the existing transformer oil sample is greatly affected by oil flow and temperature difference, resulting in inaccurate evaluation of the insulation state of the insulating paper. A simulation device for obtaining the chemical marker content in the oil at different positions in the transformer is provided.

[0007] The simulation device for obtaining the chemical marker content in the oil at different positions in the transformer proposed by the present invention includes an oil tank, a transformer oil heating module and a simulation circulation module;

[0008] A plurality of oil sampling ports are opened at the top of the oil tank, and an oil sampling probe samples through the oil sampling port to detect the chemical marker content;

[0009] The transformer oil heating module includes three temperature control units, which are respectively arranged in the high-level area, the middle-level area and the low-level area of the oil tank. The power input ends of the three temperature control units are respectively connected to the power output end of the first 220V AC power supply, and the control unit controls the on-off of the first 220V AC power supply through a relay;

[0010] The simulation circulation module includes a spiral agitator, a driving motor, a controllable flow rate pump and an oil pipeline;

[0011] The spiral agitator is installed on the inner side wall of the oil tank. The rotating shaft of the spiral agitator is connected to the transmission shaft of the driving motor. Drainage ports are respectively opened at the bottom and the top of the oil tank, and an oil pipeline is connected between the drainage ports. A controllable flow rate pump is installed on the passage of the oil pipeline.

[0012] Preferably, the temperature control unit arranged in the high-level area includes a first heating rod, a first temperature sensor and a first LCD display screen;

[0013] The power input end of the first heating rod is connected to the first power output end of the first 220V AC power supply. The first temperature sensor real-time collects the oil temperature in the high-level area, transmits the oil temperature signal in the high-level area to the control unit, and the control unit transmits the oil temperature signal in the high-level area to the first LCD display screen for display;

[0014] The temperature control unit arranged in the middle-level area includes a second heating rod, a second temperature sensor and a second LCD display screen;

[0015] The power input end of the second heating rod is connected to the second power output end of the first 220V AC power supply. The second temperature sensor real-time collects the oil temperature in the middle-level area, transmits the oil temperature signal in the middle-level area to the control unit, and the control unit transmits the oil temperature signal in the middle-level area to the second LCD display screen for display;

[0016] The temperature control unit arranged in the low-level area includes a third heating rod, a third temperature sensor and a third LCD display screen;

[0017] The power input end of the third heating rod is connected to the third power output end of the first 220V AC power supply. The third temperature sensor continuously collects the oil temperature in the low-level area and transmits the oil temperature signal in the low-level area to the control unit, and the control unit transmits the oil temperature signal in the low-level area to the third LCD display for display.

[0018] Preferably, three rotary knobs and a sliding rheostat are installed on the first 220V AC power supply. By rotating the knobs, the resistance value of the sliding rheostat is adjusted. Different resistance values of the sliding rheostat correspond to different magnitudes of current, and different magnitudes of current respectively control three temperature control units to achieve independent temperature control of the three temperature control units.

[0019] Preferably, during the operation of simulating the transformer, the first heating rod raises the temperature in the high-level area of the fuel tank to the overheat point through the control of the rotary knob, the second heating rod raises the temperature in the middle-level area of the fuel tank to the high-temperature operating temperature through the control of the rotary knob, and the third heating rod raises the temperature in the low-level area of the fuel tank to the normal operating temperature through the control of the rotary knob.

[0020] Preferably, the transformer oil heating module further includes a placement rack, which includes three layers of storage racks. The three layers of storage racks are respectively located in the high-level area, middle-level area, and low-level area of the fuel tank. Four slots are provided on each layer of the storage rack, and two heating rods and two temperature sensors are placed in the four slots. Universal wheels are provided at the bottom of the placement rack.

[0021] Preferably, the simulation circulation module further includes a second 220V AC power supply. The first power output end of the second 220V AC power supply is connected to the power input end of the drive motor, and the second power output end of the second 220V AC power supply is connected to the power input end of the controllable flow rate pump.

[0022] Preferably, there are three oil intake ports.

[0023] Preferably, it further includes a +5V power supply, which is used to supply power to the control unit.

[0024] Advantages of the present invention: The simulation device for obtaining the content of chemical markers in oils at different positions in a transformer proposed by the present invention, on the one hand, uses a heating device and a temperature detection system to continuously monitor the temperature in the fuel tank, and then the heating device can be adjusted according to the real-time temperature to simulate the difference in the temperature distribution in the fuel tank; on the other hand, a drive motor, a spiral stirrer, and a controllable flow rate pump are used to simulate the adjustment of the oil flow rate in the tank; the self-circulation caused by the fuel tank heating is simulated, and the temperature of each laminar flow can be adjusted through a temperature control system. By randomly inspecting the transformer oil in different regions, the variation trend law of the content of chemical markers in the oils at different regions in the transformer is obtained, providing an experimental basis for correcting the existing oil-paper evaluation theory. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the simulation device for obtaining the contents of chemical markers in oil at different positions inside the transformer according to the present invention;

[0026] Figure 2 is a schematic structural diagram of the transformer oil heating module according to the present invention. Specific Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0029] Next, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not limited to the present invention.

[0030] Embodiment 1:

[0031] Next, in conjunction with Figure 1 and Figure 2 this embodiment will be described. The simulation device for obtaining the contents of chemical markers in oil at different positions inside the transformer described in this embodiment includes an oil tank 16, a transformer oil heating module, and a simulation circulation module;

[0032] A plurality of oil sampling ports 19 are opened at the top of the oil tank 16, and the oil sampling probe 22 samples and detects the content of chemical markers through the oil sampling port 19;

[0033] The transformer oil heating module includes three temperature control units, which are respectively arranged in the high-level area, the middle-level area, and the low-level area of the oil tank 16. The power input ends of the three temperature control units are respectively connected to the power output end of the first 220V AC power supply 5, and the control unit 1 controls the on and off of the first 220V AC power supply 5 through the relay 21;

[0034] The simulation circulation module includes a spiral agitator 15, a drive motor 14, a controllable flow rate pump 7, and an oil pipeline 6;

[0035] The spiral agitator 15 is installed on the inner side wall of the oil tank 16. The rotating shaft of the spiral agitator 15 is connected to the transmission shaft of the drive motor 14. Drainage ports are respectively opened at the bottom and the top of the oil tank 16, and an oil pipeline 6 is connected between the drainage ports. A controllable flow rate pump 7 is installed on the passage of the oil pipeline 6.

[0036] Further, the temperature control unit arranged in the high-level area includes a first heating rod 11, a first temperature sensor 8, and a first LCD display screen 2;

[0037] The electric energy input end of the first heating rod 11 is connected to the first electric energy output end of the first 220V AC power supply 5. The first temperature sensor 8 collects the oil temperature in the high-level area in real time, transmits the oil temperature signal in the high-level area to the control unit 1, and the control unit 1 transmits the oil temperature signal in the high-level area to the first LCD display screen 2 for display;

[0038] The temperature control unit arranged in the middle-level area includes a second heating rod 12, a second temperature sensor 9, and a second LCD display screen 3;

[0039] The electric energy input end of the second heating rod 12 is connected to the second electric energy output end of the first 220V AC power supply 5. The second temperature sensor 9 collects the oil temperature in the middle-level area in real time, transmits the oil temperature signal in the middle-level area to the control unit 1, and the control unit 1 transmits the oil temperature signal in the middle-level area to the second LCD display screen 3 for display;

[0040] The temperature control unit arranged in the low-level area includes a third heating rod 13, a third temperature sensor 10, and a third LCD display screen 4;

[0041] The electric energy input end of the third heating rod 13 is connected to the third electric energy output end of the first 220V AC power supply 5. The third temperature sensor 10 collects the oil temperature in the low-level area in real time, transmits the oil temperature signal in the low-level area to the control unit 1, and the control unit 1 transmits the oil temperature signal in the low-level area to the third LCD display screen 4 for display.

[0042] Furthermore, three rotary knobs and a sliding rheostat are installed on the first 220V AC power supply 5. By rotating the rotary knobs, the resistance value of the sliding rheostat is adjusted. Different resistance values of the sliding rheostat correspond to different magnitudes of current, and different magnitudes of current respectively control the three-way temperature control units to achieve independent temperature control of the three-way temperature control units.

[0043] In this embodiment, the three-way temperature control units can be independently heated and temperature-controlled through three rotary knobs, and can simulate the temperature field distributions under different conditions.

[0044] Furthermore, when simulating the working process of the transformer, the first heating rod 11 raises the temperature in the high-level area of the fuel tank 16 to the hot spot through the control of the rotary knob, the second heating rod 12 raises the temperature in the middle-level area of the fuel tank 16 to the high-temperature operating temperature through the control of the rotary knob, and the third heating rod 13 raises the temperature in the low-level area of the fuel tank 16 to the normal operating temperature through the control of the rotary knob.

[0045] Furthermore, the transformer oil heating module further includes a placement rack 20, which includes three layers of storage racks located in the high-level area, middle-level area, and low-level area of the fuel tank 16 respectively. Each layer of the storage rack is provided with four slots, and two heating rods and two temperature sensors are placed in the four slots. The bottom end of the placement rack 20 is provided with universal wheels.

[0046] In this embodiment, the bottom end of the placement rack 20 is provided with universal wheels, so that the placement rack 20 can move on the XOY plane, and can simulate the influence trend of heating at different positions in the box on the distribution of chemical markers inside the entire fuel tank.

[0047] Furthermore, the simulation circulation module further includes a second 220V AC power supply 18. The first power output terminal of the second 220V AC power supply 18 is connected to the power input terminal of the drive motor 14, and the second power output terminal of the second 220V AC power supply 18 is connected to the power input terminal of the controllable flow rate pump 7.

[0048] In this embodiment, the second 220V AC power supply 18 supplies power to the drive motor 14, and the drive motor 14 rotates to drive the spiral agitator 15 to rotate, simulating the kinetic energy of the self-circulation caused by heat generation in the transformer oil.

[0049] In this embodiment, the second 220V AC power supply 18 supplies power to the controllable flow rate pump 7 to guide the transformer oil to flow in the oil pipeline 6.

[0050] Furthermore, the oil sampling port 19 includes three.

[0051] Furthermore, it further includes a +5V power supply 17, and the +5V power supply 17 is used to supply electrical energy to the control unit 1.

[0052] In the present invention, 220V alternating current is introduced into the drive motor 14 and the controllable flow rate pump 7, so that the drive motor 14 starts to rotate and the controllable flow rate pump 7 starts to operate, and the oil sample is circulated through the oil pipeline 6 to actually simulate the self-circulation flow of the transformer oil between each laminar flow. The oil pipeline 6 is made of acrylic material. Since the acrylic material has light transmittance, the flow condition of the oil sample inside the pipeline can be observed from the outside. The controllable flow rate pump 7 can adjust the flow rate according to the actual situation, and the flow rate adjustment range is 1.5L / min to 2L / min.

[0053] In the present invention, the first heating rod 11, the second heating rod 12 and the third heating rod 13 are connected to a 220V alternating current power supply to make the three heating rods start to work. The control unit is connected to a +5V direct current power supply. The rotary knob installed on the first 220V alternating current power supply 5 adjusts the resistance value of the sliding rheostat to adjust the heating temperature of the three heating rods. The temperatures of the respective laminar flows in the fuel tank 16 can be monitored in real time by the first temperature sensor 8, the second temperature sensor 9 and the third temperature sensor 10. The real-time temperatures are displayed on the first LCD display screen 2, the second LCD display screen 3 and the third LCD display screen 4 through the control unit. When the temperature reaches the experimental requirements, the temperature is maintained.

[0054] In the present invention, after maintaining for a certain period of time, the oil sampling probe 22 is inserted into the oil sampling port 19 to take oil. The probe can enter different depths, meeting the sampling requirements in the vertical direction; the oil can be sampled from the three oil sampling ports 19 to obtain oil samples at different positions, which meets the sampling requirements in the horizontal direction. After one experiment, the device placement rack 20 can be replaced in position to change the position of temperature rise for comparative simulation tests. The temperatures at various positions are recorded, and the contents of chemical markers contained in the transformer oil in this temperature range are detected and data processing is carried out, so as to deduce the evaluation model of chemical markers for different temperature fields or uneven temperature field distributions, providing an experimental basis for correcting the existing oil-paper evaluation theory.

[0055] Although the present invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not deviate from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer, characterized in that, It includes an oil tank (16), a transformer oil heating module and an analog circulation module; A plurality of oil sampling ports (19) are opened at the top of the oil tank (16), and an oil sampling probe (22) samples through the oil sampling port (19) to detect the content of chemical markers; The transformer oil heating module includes three temperature control units, which are respectively arranged in the high-level area, the middle-level area and the low-level area of the oil tank (16). The power input ends of the three temperature control units are respectively connected to the power output end of the first 220V AC power supply (5), and the control unit (1) controls the on-off of the first 220V AC power supply (5) through the relay (21); The analog circulation module includes a spiral stirrer (15), a driving motor (14), a controllable flow rate pump (7) and an oil pipeline (6); The spiral stirrer (15) is installed on the inner side wall of the oil tank (16). The rotating shaft of the spiral stirrer (15) is connected to the transmission shaft of the driving motor (14). Drain ports are respectively opened at the bottom and the top of the oil tank (16), and an oil pipeline (6) is connected between the drain ports. A controllable flow rate pump (7) is installed on the passage of the oil pipeline (6).

2. The simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer according to claim 1, wherein The temperature control unit arranged in the high-level area includes a first heating rod (11), a first temperature sensor (8) and a first LCD display screen (2); The power input end of the first heating rod (11) is connected to the first power output end of the first 220V AC power supply (5). The first temperature sensor (8) real-time collects the oil temperature in the high-level area, transmits the oil temperature signal in the high-level area to the control unit (1), and the control unit (1) transmits the oil temperature signal in the high-level area to the first LCD display screen (2) for display; The temperature control unit arranged in the middle-level area includes a second heating rod (12), a second temperature sensor (9) and a second LCD display screen (3); The power input end of the second heating rod (12) is connected to the second power output end of the first 220V AC power supply (5). The second temperature sensor (9) real-time collects the oil temperature in the middle-level area, transmits the oil temperature signal in the middle-level area to the control unit (1), and the control unit (1) transmits the oil temperature signal in the middle-level area to the second LCD display screen (3) for display; The temperature control unit arranged in the low-level area includes a third heating rod (13), a third temperature sensor (10) and a third LCD display screen (4); The power input end of the third heating rod (13) is connected to the third power output end of the first 220V AC power supply (5). The third temperature sensor (10) real-time collects the oil temperature in the low-level area, transmits the oil temperature signal in the low-level area to the control unit (1), and the control unit (1) transmits the oil temperature signal in the low-level area to the third LCD display screen (4) for display.

3. The simulation device for obtaining the content of chemical markers in oil at different positions inside a transformer according to claim 2, wherein, Three rotary knobs and a sliding rheostat are installed on the first 220V AC power supply (5). The resistance value of the sliding rheostat is adjusted by rotating the rotary knob. Different resistance values of the sliding rheostat correspond to different magnitudes of current, and different magnitudes of current respectively control the three temperature control units to realize independent temperature control of the three temperature control units.

4. The simulation device for obtaining the content of chemical markers in oil at different positions inside a transformer according to claim 3, wherein When simulating the working process of the transformer, the first heating rod (11) raises the temperature in the high-level area of the fuel tank (16) to the overheating point through the control of the rotary knob, the second heating rod (12) raises the temperature in the middle-level area of the fuel tank (16) to the high-temperature operating temperature through the control of the rotary knob, and the third heating rod (13) raises the temperature in the low-level area of the fuel tank (16) to the normal operating temperature through the control of the rotary knob.

5. The simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer according to claim 2, 3 or 4, characterized in that, The transformer oil heating module further includes a placement rack (20). The placement rack (20) includes three layers of storage racks, which are respectively located in the high-level area, middle-level area, and low-level area of the fuel tank (16). Four slots are provided on each layer of the storage rack, and two heating rods and two temperature sensors are placed in the four slots. Universal wheels are provided at the bottom of the placement rack (20).

6. The simulation device for obtaining the content of chemical markers in oil at different positions inside a transformer according to claim 1, wherein, The simulation circulation module further includes a second 220V AC power supply (18). The first power output terminal of the second 220V AC power supply (18) is connected to the power input terminal of the drive motor (14), and the second power output terminal of the second 220V AC power supply (18) is connected to the power input terminal of the controllable flow rate pump (7).

7. The simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer according to claim 1, wherein There are three oil intake ports (19).

8. The simulation device for obtaining the contents of chemical markers in oil at different positions inside a transformer according to claim 1, characterized in that, It further includes a +5V power supply (17), and the +5V power supply (17) is used to supply power to the control unit (1).

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