Insulation oil insulation strength detection device and control system and method

Abstract

The invention discloses an insulating oil insulation strength detection device and a control system, and relates to the technical field of insulating oil insulation strength testing, and the insulating oil insulation strength detection device comprises an oil storage assembly which comprises a sealed oil tank; the detection assembly comprises a detection box, the detection box is connected with the oil outlet of the sealed oil tank through an oil conveying pipe, vertical partition plates are arranged in the detection box, and the detection box is divided into a plurality of detection units with the same size by the vertical partition plates; and an electrode group for testing the insulating strength of the insulating oil is arranged in the detection unit. The device can simulate the electric heating aging and water-containing state of the insulating oil under the actual working condition, ensures the accuracy of the test result, divides the interior of the detection box into a plurality of detection units through the vertical partition plates, realizes multi-station synchronous detection, remarkably improves the detection efficiency and precision, and reduces the detection cost. Independent moisture control and electrode group gap adjustment are carried out in each detection unit, so that the stability and consistency of experimental conditions are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of insulating oil insulation strength testing, and in particular to an insulating oil insulation strength testing device and a control system. Background Art

[0002] As a key insulating medium in transformers, power cable terminals and high-voltage equipment, the stability of insulating oil performance is directly related to the safe operation of the power system. However, during the long-term operation of the equipment, the insulating oil will be subjected to the dual effects of electricity and heat, and will gradually undergo electrothermal aging, resulting in a decrease in insulation performance. In addition, in oil-filled power equipment, if external moisture enters the oil, it will also affect the insulation strength of the oil, further accelerate its aging process, and significantly reduce its insulation strength, increase dielectric loss, and may even cause serious failures in the power equipment. Over time, the accumulation of these aging effects will eventually affect the service life and operational reliability of the entire power equipment. The current accident investigation results for oil-filled power equipment show that the proportion of equipment failures due to moisture ingress is very high, but there is currently no relatively systematic insulation strength detection device for insulating oil containing different moisture content after electrothermal aging.

[0003] Most traditional insulating oil testing methods involve taking out the insulating oil after electrothermal aging and then pouring it into a device for testing the insulation strength. This cannot avoid contact between the oil and air. Studies have shown that insulating oil exposed to air will absorb more water vapor, affecting the insulation strength and test accuracy, and cannot effectively evaluate the real-time health status of the insulating oil. The current testing methods are not perfect enough to fully reflect the degree of deterioration of the insulating oil.

[0004] Therefore, it is particularly important to develop a device that can detect the degree of electrothermal aging and water content of insulating oil in real time under actual operating conditions. Such a device not only needs to accurately evaluate the insulation strength of the oil after electrothermal aging, but also needs to be able to sensitively adjust the water content in the oil, thereby providing a scientific basis for the operation and maintenance of power equipment. At present, there is a lack of devices that can simultaneously detect the insulation strength of insulating oil after electrothermal aging and water content. Especially when faced with complex working conditions and equipment that has been running for a long time, the existing technical means have great limitations. Therefore, this patent proposes an insulating oil insulation strength detection device, which aims to fill this technical gap and provide more comprehensive technical support for the safe operation of power equipment. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the current lack of devices that can simultaneously detect the electrical and thermal aging of insulating oil and the insulation strength after water inclusion, especially when facing complex working conditions and long-term running equipment, the existing technical means have great limitations, and the present invention is proposed.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: an insulating oil dielectric strength detection device, comprising an oil storage component, which includes a sealed oil tank; and a detection component, which includes a detection box, the detection box is connected to the oil outlet of the sealed oil tank through an oil delivery pipe, the interior of the detection box is arranged with vertical partitions, the vertical partitions divide the detection box into a plurality of detection units of the same size, the detection unit is provided with an electrode group for testing the dielectric strength of the insulating oil, and a stepper motor for adjusting the electrode spacing.

[0008] As a preferred solution of the insulating oil dielectric strength detection device of the present invention, an electric heater and a flat electrode are arranged in the sealed oil tank to simulate the electrothermal aging process of the insulating oil under high temperature and electric field conditions.

[0009] As a preferred solution of the insulating oil dielectric strength detection device of the present invention, a temperature sensor is arranged outside the sealed oil tank for monitoring the temperature of the insulating oil inside the sealed oil tank.

[0010] As a preferred solution of the insulating oil dielectric strength detection device of the present invention, wherein: the electrode group includes a plate electrode, and a ball electrode or a needle electrode matched with the plate electrode; wherein the plate electrode is connected to the output end of the stepper motor.

[0011] As a preferred embodiment of the insulating oil dielectric strength detection device of the present invention, any of the detection units is provided with an oil inlet pipe and an oil outlet pipe, the end of the oil inlet pipe away from the detection box is connected to the sealed oil tank, and the end of the oil outlet pipe away from the detection box is connected to the input end of the oil pump.

[0012] As a preferred embodiment of the insulating oil dielectric strength detection device of the present invention, the detection component further comprises a water replenishment tank connected to the detection box, a nozzle is provided on the upper part of any detection unit, a micro pump is provided inside the water replenishment tank, and a water replenishment pipe is provided between the output end of the micro pump and the input end of the nozzle.

[0013] As a preferred embodiment of the insulating oil dielectric strength detection device of the present invention, the detection component further includes a magnetic stirrer arranged inside any of the detection units, and an electromagnetic stirrer arranged at the bottom of the detection box, wherein the electromagnetic stirrer is used to control the rotation of the magnetic stirrer to fully mix the insulating oil and water.

[0014] As a preferred embodiment of the insulating oil dielectric strength detection device of the present invention, the detection component further comprises a nitrogen bottle, the gas outlet of the nitrogen bottle is connected to an air supply pipe, and the end of the air supply pipe away from the nitrogen bottle is connected to any detection unit.

[0015] In order to solve the above technical problems, the present invention also provides the following technical solutions: a control system, comprising the insulating oil insulation strength detection device; and a human-computer interaction unit, which is used to assist the user in setting parameters and real-time monitoring of the experimental status; and a central control unit, wherein the central control unit is electrically connected to the electrical equipment in the insulation strength detection device.

[0016] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for detecting the dielectric strength of insulating oil, which specifically comprises the following steps;

[0017] Simulate the electrothermal aging process of insulating oil in a sealed oil tank and monitor the oil temperature;

[0018] The aged insulating oil is transported to the detection unit of the detection box;

[0019] Add water to the inside of the test unit and stir to mix the oil and water to simulate the state of insulating oil containing water;

[0020] Perform dielectric strength test on the insulating oil in the test unit.

[0021] The beneficial effects of the present invention are as follows: the device can simulate the electrical and thermal aging and water content of insulating oil under actual working conditions, ensure the accuracy of the test results, divide the interior of the test box into multiple test units through vertical partitions, realize multi-station synchronous detection, significantly improve the detection efficiency and accuracy, and perform independent moisture control and electrode group gap adjustment in each test unit to ensure the stability and consistency of the experimental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the overall structure of the insulating oil dielectric strength detection device and control system described in the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the detection unit and the plate-ball electrode group in the present invention.

[0025] Figure 3It is a schematic diagram of the structure of the detection unit and the plate-needle electrode group in the present invention.

[0026] In the figure: 100, oil storage assembly; 101, sealed oil tank; 102, oil delivery pipe; 103, electric heater; 104, flat electrode; 105, temperature sensor; 200, detection assembly; 201, detection box; 202, vertical partition; 203, detection unit; 204, electrode group; 204a, plate electrode; 204b, ball electrode; 204c, needle electrode; 205, stepping motor; 206, oil inlet pipe; 207, oil discharge pipe; 208, pump Oil pump; 209, water supply tank; 210, nozzle; 211, water supply pipe; 212, magnetic stirrer; 213, electromagnetic stirrer; 214, nitrogen bottle; 215, air supply pipe; 300, human-computer interaction unit; 400, central control unit; 401, regulation module; 402, valve control module; 403, relay; 404, industrial frequency voltage generator; 405, DC voltage generator; 406, impulse voltage generator; 500, high-voltage AC power supply. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Example 1

[0032] Reference Figure 1 to Figure 3, which is the first embodiment of the present invention, provides an insulating oil dielectric strength testing device, comprising an oil storage component 100 and a testing component 200. The oil storage component 100 is used to store and provide the testing insulating oil to the testing component 200, and the testing component 200 is used to test the dielectric strength of the insulating oil after electrical and thermal aging and water inclusion.

[0033] Furthermore, the oil storage component 100 includes a sealed oil tank 101, and an electric heater 103 and a flat electrode 104 are arranged in the sealed oil tank 101; wherein, the sealed oil tank 101 is filled with pure insulating oil or electrically aged insulating oil, and the flat electrode 104 is powered by a high-voltage AC power supply 500. If the sealed oil tank 101 is filled with pure insulating oil, the electric heater 103 and the flat electrode 104 are started, and after simulating the electrically aged process of insulating oil under high temperature and electric field conditions, the insulating oil is supplied to the detection component 200 for insulation testing; if the sealed oil tank 101 is filled with electrically aged insulating oil, the insulating oil is directly supplied to the detection component 200 for insulation testing.

[0034] Furthermore, a temperature sensor 105 is provided on the outside of the sealed oil tank 101, which can monitor the oil temperature inside the sealed oil tank 101 in real time and implement closed-loop control to ensure that the oil temperature remains within a preset range, thereby ensuring the stability of the electrothermal aging process.

[0035] Furthermore, the detection component 200 includes a detection box 201, which is connected to the oil outlet of the sealed oil tank 101 through an oil delivery pipe 102. Vertical partitions 202 are arranged inside the detection box 201, and the vertical partitions 202 divide the detection box 201 into multiple detection units 203 of the same size.

[0036] Specifically, the detection box 201 is a rectangular organic glass box, referring to Figure 1 As shown, five equidistantly arranged vertical partitions 202 are provided inside the test box 201 to divide the test box 201 into six test units 203 of the same size. The six test units 203 are independent of each other and are used to perform insulation strength tests on insulating oil under different conditions.

[0037] The vertical partition 202 is made of the same material as the test box 201, which is plexiglass. The plexiglass has good sealing performance and high temperature resistance, ensuring that it can resist changes in temperature and pressure during the experiment. At the same time, it has good observability, which is convenient for experimenters to monitor the flow of insulating oil and whether it is broken down.

[0038] Furthermore, the detection component 200 also includes an electrode group 204 arranged in the detection unit 203, and a stepper motor 205 arranged outside the detection box 201; wherein, the electrode group 204 is used to test the insulation strength of the insulating oil, the electrode group 204 includes a plate electrode 204a, and a ball electrode 204b or a needle electrode 204c matched with the plate electrode 204a, the stepper motor 205 is used to adjust the electrode spacing, and the output end of the stepper motor 205 is connected to the plate electrode 204a.

[0039] Specifically, refer to Figure 2 and Figure 3 As shown, three of the detection units 203 are installed with ball-plate electrode groups, and the other three detection units 203 are installed with needle-plate electrode groups. The material of the electrode group 204 is brass with high conductivity and corrosion resistance, ensuring that it maintains good conductivity and durability during the experiment.

[0040] Specifically, the stepper motor 205 controls the gap distance between the plate electrode 204a and the ball electrode 204b (or the needle electrode 204c), and the gap adjustment accuracy can reach 0.01 mm, so that different electric field strengths can be set according to experimental requirements.

[0041] Furthermore, the electrode group 204 is connected to the external industrial frequency voltage generator 404, the DC voltage generator 405 and the impulse voltage generator 406 through the relay 403. The experimenter can apply different moisture or set different uniformity levels in different detection units 203 according to the experimental design, thereby realizing the simultaneous conduct of multiple groups of experiments.

[0042] Furthermore, the detection component 200 also includes a water replenishment tank 209 connected to the detection box 201. A nozzle 210 is provided on the upper part of any detection unit 203. A micro pump is provided inside the water replenishment tank 209. A water replenishment pipe 211 is provided between the output end of the micro pump and the input end of the nozzle 210. Water is replenished and supplied to the inside of the detection unit 203 through the micro pump. The amount of water added can be accurately controlled according to the experimental requirements, thereby achieving precise adjustment of the water content in the oil, making the insulating oil contain water, and realizing the insulation detection of the insulating oil after containing water.

[0043] Example 2

[0044] Reference Figure 1, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that any detection unit 203 is provided with an oil inlet pipe 206 and an oil discharge pipe 207. The end of the oil inlet pipe 206 away from the detection box 201 is connected to the sealed oil tank 101, and the oil can be injected into any detection unit 203 through the oil inlet pipe 206 to ensure that the amount of oil in each detection unit 203 is consistent. The end of the oil discharge pipe 207 away from the detection box 201 is connected to the input end of the oil pump 208. After the experiment, the oil in the detection box 201 is discharged through the oil discharge pipe 207 to achieve rapid oil change and equipment cleaning. By setting the oil pump 208, efficient emptying can be achieved.

[0045] Furthermore, the detection assembly 200 also includes a magnetic stirrer 212 disposed inside any detection unit 203, and an electromagnetic stirrer 213 disposed at the bottom of the detection box 201. The electromagnetic stirrer 213 is used to control the rotation of the magnetic stirrer 212 to fully mix the insulating oil and the water. The stirring speed can be adjusted according to the viscosity and water content of the oil to ensure that the water is evenly distributed in the oil.

[0046] Furthermore, the detection component 200 also includes a nitrogen bottle 214, the gas outlet of the nitrogen bottle 214 is connected to an air supply pipe 215, and the end of the air supply pipe 215 away from the nitrogen bottle 214 is connected to any detection unit 203. Before the oil is injected into the detection box 201, dry nitrogen is filled into each detection unit 203 of the detection box 201 through the air supply pipe 215 to remove the air in the detection unit 203 and maintain the internal dry environment, thereby avoiding the interference of environmental humidity on the experiment. The flow rate and pressure during nitrogen injection can be adjusted by the control valve to ensure that the air pressure in each small cavity remains consistent.

[0047] Furthermore, at least one valve for controlling the on-off of the pipeline is installed on each of the oil inlet pipe 206 , the oil outlet pipe 207 , the water supply pipe 211 , the air supply pipe 215 , and the oil delivery pipe 102 .

[0048] The remaining structures are the same as those of Example 1.

[0049] Example 3

[0050] Reference Figure 1 , which is the third embodiment of the present invention, and this embodiment provides a control system, including the insulating oil dielectric strength detection device in embodiments 1 and 2; and a human-computer interaction unit 300, which is used to assist the user in setting parameters and real-time monitoring of the experimental status; a central control unit 400, which is electrically connected to the electrical equipment in the dielectric strength detection device, including controlling the start and stop of the stepping motor 205, the relay 403, the industrial frequency voltage generator 404, the DC voltage generator 405, and the impulse voltage generator 406.

[0051] Furthermore, the central control unit 400 includes a control module 401, which is used to adjust the power of the electric heater 103 to meet the aging requirements of the insulating oil under different temperature conditions.

[0052] Furthermore, the central control unit 400 also includes a valve control module 402, which is used to control the opening and closing of valves on each pipeline, realize automatic control of the opening and closing of the valves, and thus achieve the purpose of regulating the internal pressure and flow of the pipeline, and realize precise control of the oil delivery volume, water delivery volume, and nitrogen injection volume.

[0053] Furthermore, the central control unit 400 also includes a moisture control module, which is used to achieve independent control of the water replenishment of each detection unit 203, accurately adjust the water content in each detection unit 203, and simulate the aging state of oil under different humidity conditions.

[0054] The remaining structure is the same as that of Example 2.

[0055] Example 4

[0056] Reference Figure 1 , which is the fourth embodiment of the present invention, and provides a method for detecting the dielectric strength of insulating oil, which specifically includes the following steps:

[0057] The electrothermal aging process of the insulating oil is simulated in the sealed oil tank 101, and the oil temperature is monitored; wherein, the electrothermal aging of the insulating oil is achieved by starting the electric heater 103 and the flat electrode 104 to electrically heat the insulating oil in the sealed oil tank 101, and the insulating oil temperature is monitored by the temperature sensor 105.

[0058] The aged insulating oil is transported to the detection unit 203 of the detection box 201; wherein, a plurality of detection units 203 are arranged inside the detection box 201, each detection unit 203 is independent and can simultaneously perform multiple groups of insulating oil insulation strength test tests under different conditions. Specifically, the insulating oil insulation strength test is performed by the electrode group 204.

[0059] Water is added to the detection unit 203 and stirred to mix the oil and water to simulate the state of insulating oil containing water. The water is added by a micro pump to achieve precise control of the amount of water added. The oil and water are stirred by an electromagnetic stirrer 213 to mix the two.

[0060] The insulating oil in the detection unit 203 is tested for dielectric strength; wherein parameter setting, real-time monitoring and automatic control of the detection process are implemented through the central control unit 400 and the human-computer interaction unit 300.

[0061] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0062] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0063] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An insulating oil dielectric strength detection device, characterized in that: include, An oil storage assembly (100) comprising a sealed oil tank (101); and A detection assembly (200) comprises a detection box (201), wherein the detection box (201) is connected to the oil outlet of the sealed oil tank (101) via an oil delivery pipe (102), wherein vertical partitions (202) are arranged inside the detection box (201), wherein the vertical partitions (202) divide the detection box (201) into a plurality of detection units (203) of the same size, wherein an electrode group (204) for testing the insulation strength of insulating oil and a stepping motor (205) for adjusting the distance between electrodes are arranged inside the detection unit (203).

2. The insulating oil dielectric strength testing device according to claim 1, characterized in that: An electric heater (103) and a flat electrode (104) are arranged in the sealed oil tank (101) to simulate the electrothermal aging process of insulating oil under high temperature and electric field conditions.

3. The insulating oil dielectric strength testing device according to claim 2, characterized in that: A temperature sensor (105) is arranged outside the sealed oil tank (101) and is used to monitor the temperature of the insulating oil inside the sealed oil tank (101).

4. The insulating oil dielectric strength testing device according to any one of claims 1 to 3, characterized in that: The electrode group (204) comprises a plate electrode (204a), and a ball electrode (204b) or a needle electrode (204c) matched with the plate electrode (204a); wherein the plate electrode (204a) is connected to the output end of the stepping motor (205).

5. The insulating oil dielectric strength testing device according to claim 4, characterized in that: Any of the detection units (203) is provided with an oil inlet pipe (206) and an oil outlet pipe (207); one end of the oil inlet pipe (206) away from the detection box (201) is connected to the sealed oil tank (101); and one end of the oil outlet pipe (207) away from the detection box (201) is connected to the input end of the oil pump (208).

6. The insulating oil dielectric strength testing device according to claim 5, characterized in that: The detection assembly (200) further comprises a water replenishment tank (209) connected to the detection box (201); a nozzle (210) is provided on the upper portion of any of the detection units (203); a micro pump is provided inside the water replenishment tank (209); and a water replenishment pipe (211) is provided between the output end of the micro pump and the input end of the nozzle (210).

7. The insulating oil dielectric strength testing device according to claim 6, characterized in that: The detection assembly (200) further comprises a magnetic stirrer (212) arranged inside any one of the detection units (203), and an electromagnetic stirrer (213) arranged at the bottom of the detection box (201), wherein the electromagnetic stirrer (213) is used to control the rotation of the magnetic stirrer (212) so that the insulating oil and water are fully mixed.

8. The insulating oil dielectric strength testing device according to claim 7, characterized in that: The detection assembly (200) further comprises a nitrogen bottle (214), the gas outlet of the nitrogen bottle (214) being connected to an air supply pipe (215), and one end of the air supply pipe (215) away from the nitrogen bottle (214) being in communication with any detection unit (203).

9. A control system, characterized in that: The device comprises the insulating oil dielectric strength detection device as claimed in any one of claims 1 to 8; and A human-computer interaction unit (300), which is used to assist the user in setting parameters and monitoring the experimental status in real time; A central control unit (400) is electrically connected to the electrical equipment in the insulation strength detection device.

10. A method for detecting the dielectric strength of insulating oil based on the control system according to claim 9, characterized in that: The specific steps include: Simulating the electrothermal aging process of insulating oil in a sealed oil tank (101) and monitoring the oil temperature; transporting the aged insulating oil to a detection unit (203) of a detection box (201); Adding water to the inside of the detection unit (203), and stirring to mix the oil and water, so as to simulate the state of the insulating oil after containing water; The insulation strength of the insulating oil in the detection unit (203) is tested.

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