Integrated dielectric loss testing device
By designing an integrated dielectric loss testing device, including premix tank, preheating tank and detection tank, the problem of poor oil detection accuracy of transformer oil is solved, and the uniform distribution of moisture in the oil is achieved and the detection accuracy is improved.
Patent Information
- Application Number
- CN202421055074.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-05-15
AI Technical Summary
In the prior art, the detection accuracy of transformer oil is poor, especially in the detection of moisture content in oil, and errors are prone to occur.
An integrated dielectric loss testing device is designed, including a premix tank, a preheating tank and a testing tank. An oil mixing mechanism is provided in the pre-mix tank, so that the moisture in the oil is evenly distributed through stirring; the pre-heating tank adopts two sets of partitions and heat exchange pipes to achieve efficient heat exchange and ensure that the moisture is evenly distributed in the oil; a moisture content detection sensor is provided in the detection tank to monitor the moisture content in the oil in real time.
Through uniform stirring and efficient heat exchange, we ensure that the moisture distribution in the transformer oil is evenly distributed, which improves detection accuracy, reduces errors, and enhances the ability to insulating the transformer and prevent faults.
Smart Images
Figure CN222825343U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer oil detection, in particular to an integrated dielectric loss testing device. Background Art
[0002] The dielectric loss in transformers is tested for the following reasons:
[0003] Insulation performance evaluation: Dielectric loss test is an important means to evaluate the insulation performance of transformers. The insulation performance of transformers is crucial to their safe operation, and dielectric loss factor is one of the important indicators to measure insulation performance. By testing dielectric loss, the quality of transformer insulation materials and the integrity of insulation structure can be evaluated, thereby determining whether the transformer has insulation defects or aging.
[0004] Fault prevention: Increased dielectric loss in a transformer may indicate an impending equipment failure. For example, factors such as oil aging and increased moisture content may lead to increased dielectric loss. By performing dielectric loss tests regularly, these problems can be discovered in time and appropriate measures can be taken to prevent or repair them, thus avoiding losses caused by equipment failure.
[0005] Moisture in oil: Moisture is one of the common contaminants in transformer oil. When the moisture content in the oil increases, the moisture will form partial discharge under the action of the electric field, resulting in increased dielectric loss.
[0006] The specific gravity method or moisture content instrument is generally used for direct testing in the process of detecting the moisture content in transformer oil. The specific gravity method is based on the specific gravity difference between transformer oil and water. Since the increase in moisture in transformer oil is generally not large, it is difficult to accurately determine the moisture content in the oil. Direct measurement with moisture content instrument is relatively convenient, but due to the influence of the fluidity of the transformer oil system, the moisture distribution is not very uniform, resulting in errors in each sampling and testing of the transformer oil. Utility Model Content
[0007] The utility model aims at the technical problems existing in the prior art and provides an integrated dielectric loss test device to solve the problem of poor transformer oil detection accuracy.
[0008] The utility model solves the above technical problems with the following technical solutions: an integrated dielectric loss test device, including a premixing tank, a preheating tank and a detection tank;
[0009] The inner cavity of the premix tank is provided with an oil stirring mechanism, and the oil stirring mechanism can stir the transformer oil in the premix tank so that the water content in the oil is evenly distributed;
[0010] The inner cavity of the preheating tank is provided with two groups of partitions, so that the inner cavity is divided into an oil inlet cavity, a heat exchange cavity and an oil outlet cavity in sequence; a heat exchange pipe connecting the oil inlet cavity and the oil outlet cavity is arranged between the two groups of partitions; the oil inlet cavity of the preheating tank is connected with the oil discharge end of the premix tank through an oil pipe, and the oil outlet cavity is connected with the detection tank through an oil pipe; the upper and lower layers of the heat exchange cavity of the preheating tank are respectively provided with a water outlet pipe and a water inlet pipe;
[0011] The inner cavity of the detection tank is provided with a plurality of moisture content detection sensors.
[0012] On the basis of the above technical solution, the present invention can also be improved as follows.
[0013] Furthermore, the oil stirring mechanism includes a driving spindle, stirring blades and a motor driving component. The driving spindle is horizontally placed at the center of the inner cavity of the premix tank, the stirring blades are evenly installed outside the driving spindle, and the motor driving component is drivingly connected to the driving spindle.
[0014] Furthermore, a horizontally placed oil inlet pipe is arranged on the top of the premix tank, and a plurality of equally spaced oil delivery holes are provided below the oil inlet pipe.
[0015] Furthermore, a plurality of groups of heat exchange tubes are evenly arranged between the two groups of partitions, and heat exchange gaps are reserved between adjacent heat exchange tubes.
[0016] Furthermore, an oil pump is installed on the oil pipe between the preheating tank and the premixing tank.
[0017] Furthermore, a water pump is installed on the water inlet pipe of the preheating tank.
[0018] Furthermore, an oil unloading hopper is provided at the bottom of the detection tank, and a control valve is provided at the oil outlet of the oil unloading hopper.
[0019] Moreover, the integrated dielectric loss test device provided by the utility model has at least the following beneficial effects compared with the prior art:
[0020] 1) The oil stirring mechanism in the premix tank drives the stirring blades to rotate through the motor drive to achieve uniform stirring of the transformer oil. This stirring method can ensure that the moisture and impurities in the oil are evenly dispersed and mixed.
[0021] 2) The preheating tank uses two sets of partitions to divide the inner cavity into the oil inlet cavity, heat exchange cavity and oil outlet cavity, and the heat exchange tubes are evenly arranged along the partitions. This design allows the transformer oil to evenly contact the heat exchange medium when flowing through the heat exchange tubes, thereby achieving efficient heat exchange. The preheated oil has better fluidity, which helps to distribute the water in the oil more evenly, and also helps to improve the accuracy of water content detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0023] Figure 2 It is a schematic diagram of the overall structure of the utility model from another perspective;
[0024] Figure 3 It is a cross-sectional schematic diagram of the premixed tank of the utility model;
[0025] Figure 4 This is a schematic diagram of the internal structure of the preheating tank of the utility model;
[0026] Figure 5 It is a cross-sectional schematic diagram of the detection tank of the utility model.
[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0028] Premix tank 1, oil inlet pipe 1.1, oil delivery hole 1.2, preheating tank 2, partition 2.1, heat exchange tube 2.2, detection tank 3, water content detection sensor 3.1, oil stirring mechanism 4, driving main shaft 4.1, stirring blade 4.2, motor driving part 4.3, oil pump 5, water pump 6. DETAILED DESCRIPTION
[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0030] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For ordinary technicians in this field, the specific meanings of such terms in this patent can be understood according to specific circumstances.
[0031] like Figure 1 and Figure 2 As shown, the integrated dielectric loss test device of the practical design includes a premixing tank 1, a preheating tank 2 and a detection tank 3;
[0032] The inner cavity of the premix tank 1 is provided with an oil stirring mechanism 4, and the oil stirring mechanism 4 can stir the transformer oil in the premix tank 1 so that the water content in the oil is evenly distributed;
[0033] The inner cavity of the preheating tank 2 is provided with two groups of partitions 2.1, so that the inner cavity is divided into an oil inlet cavity, a heat exchange cavity and an oil outlet cavity in sequence; a heat exchange pipe 2.2 connecting the oil inlet cavity and the oil outlet cavity is provided between the two groups of partitions 2.1; the oil inlet cavity of the preheating tank 2 is connected to the oil discharge end of the premixing tank 1 through an oil pipe, and its oil outlet cavity is connected to the detection tank 3 through an oil pipe; the upper and lower layers of the heat exchange cavity of the preheating tank 2 are respectively provided with a water outlet pipe and a water inlet pipe;
[0034] like Figure 5 The inner cavity of the detection tank 3 is provided with a plurality of moisture content detection sensors 3.1.
[0035] In this embodiment, the transformer oil to be tested is extracted from the transformer and transported to the premix tank 1. The oil stirring mechanism 4 in the premix tank 1 starts to work to stir the transformer oil so that the moisture in the oil can be evenly distributed to ensure subsequent accurate measurement.
[0036] The stirred transformer oil flows from the oil discharge end of the premix tank 1 into the oil inlet chamber of the preheating tank 2 through the oil pipe. The inner chamber of the preheating tank 2 is divided into an oil inlet chamber, a heat exchange chamber and an oil outlet chamber by two sets of partitions 2.1. The oil enters the oil inlet chamber and exchanges heat with the heat exchange medium such as hot water or steam in the heat exchange chamber through the heat exchange tube 2.2, thereby being heated to an appropriate temperature. The preheated oil then enters the oil outlet chamber and flows into the detection tank 3 through the oil pipe. The purpose of preheating is to improve the fluidity of the oil and ensure that the water content is more evenly distributed in the oil, which also helps to improve the accuracy of water content detection.
[0037] The moisture content of transformer oil is closely related to its insulation performance and thermal stability. The loss of transformers can be evaluated by testing the moisture content of transformer oil. The higher the moisture content of transformer oil, the worse its insulation performance will be, which may lead to an increase in electrical failures and partial discharge, thereby increasing transformer losses. In addition, transformer oil with a high moisture content may also accelerate the oxidation and deterioration of the oil, further affecting the performance and life of the transformer.
[0038] As a supplement, the water content detection sensor 3.1 can use the IFW-2B series sensor, which can continuously monitor the water content in the oil in real time. This sensor uses a variety of principles (such as capacitance method, resistance method, infrared absorption method, microwave method, etc.) to measure the water content in the oil.
[0039] When there is water in the transformer oil, some physical properties of the sensor (such as capacitance, resistance, infrared light absorption, microwave propagation characteristics, etc.) will change. By measuring the changes in these physical properties, the water content in the transformer oil can be determined.
[0040] As an implementation method, Figure 3 As shown, the oil stirring mechanism 4 includes a driving spindle 4.1, stirring blades 4.2 and a motor driving component 4.3. The driving spindle 4.1 is horizontally placed at the center of the inner cavity of the premix tank 1, the stirring blades 4.2 are evenly installed outside the driving spindle 4.1, and the motor driving component 4.3 is drivingly connected to the driving spindle 4.1.
[0041] In this embodiment, the motor drive 4.3 is the power source of the oil stirring mechanism 4. When the motor drive 4.3 is started, it drives the driving main shaft 4.1 to start rotating. The driving main shaft 4.1 is horizontally placed at the center of the inner cavity of the premix tank 1. This design can ensure that the range of movement of the stirring blade 4.2 in the premix tank 1 is maximized, so as to fully stir the transformer oil inside.
[0042] The stirring blades 4.2 are the key part of the oil stirring mechanism 4, and are evenly arranged outside the driving main shaft 4.1. When the driving main shaft 4.1 rotates, the stirring blades 4.2 also rotate, generating centrifugal force and shear force, thereby driving the transformer oil to flow and circulate in the premix tank 1.
[0043] It should be noted that the stirring rate should not be too fast, as it may cause liquid turbulence and increase the risk of water-oil separation. The multiple stirring blades 4.2 drive the transformer oil to flow evenly. This flow and circulation will evenly disperse and mix the moisture and impurities in the transformer oil.
[0044] Specifically, a horizontally placed oil inlet pipe 1.1 is arranged on the top of the premix tank 1, and a plurality of equally spaced oil delivery holes 1.2 are provided below the oil inlet pipe 1.1. Since the oil inlet pipe 1.1 is horizontally placed and a plurality of equally spaced oil delivery holes 1.2 are provided below the oil inlet pipe 1.1, the oil can flow out of the oil delivery holes 1.2 evenly and be evenly distributed inside the premix tank 1, so that the transformer oil can be evenly distributed when entering the premix tank 1, and uneven mixing caused by the oil flow being concentrated in a certain area is avoided.
[0045] As an implementation method, Figure 4 As shown, a plurality of groups of heat exchange tubes 2.2 are evenly arranged between the two groups of partitions 2.1, and heat exchange gaps are reserved between adjacent heat exchange tubes 2.2.
[0046] When the preheating tank 2 starts working, the heat exchange medium (such as hot water or steam) enters the heat exchange cavity of the preheating tank 2 from the water inlet pipe. These heat exchange media flow in the heat exchange cavity and exchange heat with the transformer oil in the heat exchange tube 2.2. Since the heat exchange tube 2.2 is evenly arranged, it can be ensured that the transformer oil can be evenly contacted with the heat exchange medium when flowing through the heat exchange tube, thereby achieving efficient heat exchange.
[0047] In addition, the temperature of the transformer oil after heat exchange needs to be controlled between 60℃-80℃. This temperature is conducive to the uniform distribution of water in the oil and improves measurement accuracy. Too high temperature can easily promote oil-water separation and accelerate oil aging.
[0048] As an implementation method, an oil pump 5 is also installed on the oil pipe between the preheating tank 2 and the premixing tank 1. The oil pump 5 is installed on the oil pipe between the preheating tank 2 and the premixing tank 1, and its main function is to provide stable oil flow power to ensure that the transformer oil can flow smoothly from the premixing tank 1 to the preheating tank 2.
[0049] In addition, a water pump 6 is installed on the water inlet pipe of the preheating tank 2. The water pump 6 is installed on the water inlet pipe of the preheating tank 2. Its main function is to provide stable water flow power to ensure that heat exchange media such as hot water or steam can smoothly enter the heat exchange chamber of the preheating tank 2.
[0050] As an implementation method, an oil unloading hopper is provided at the bottom of the detection tank 3, and a control valve is provided at the oil outlet of the oil unloading hopper;
[0051] The oil discharge hopper is arranged at the bottom of the detection tank 3, and its function is to collect and discharge the transformer oil after the test. After the test is completed, the oil in the detection tank 3 can be released by opening the control valve to make it flow into the oil discharge hopper. The control valve can be opened and closed as needed to control the discharge speed and discharge amount of the oil.
[0052] The oil unloading bucket can also be equipped with a discharge pipe and a discharge port to facilitate the discharge of oil into a designated collection container.
[0053] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.
[0054] Although the preferred embodiments of the utility model have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model.
[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. An integrated dielectric loss test device, characterized in that: It comprises a premix tank (1), a preheating tank (2) and a detection tank (3); The inner cavity of the premix tank (1) is provided with an oil stirring mechanism (4), and the oil stirring mechanism (4) can stir the transformer oil in the premix tank (1) so that the water content in the oil is evenly distributed; The inner cavity of the preheating tank (2) is provided with two groups of partitions (2.1) so that the inner cavity is divided into an oil inlet cavity, a heat exchange cavity and an oil outlet cavity in sequence; a heat exchange pipe (2.2) connecting the oil inlet cavity and the oil outlet cavity is provided between the two groups of partitions (2.1); the oil inlet cavity of the preheating tank (2) is connected to the oil discharge end of the premixing tank (1) through an oil pipe, and the oil outlet cavity is connected to the detection tank (3) through an oil pipe; the upper and lower layers of the heat exchange cavity of the preheating tank (2) are respectively provided with a water outlet pipe and a water inlet pipe; The inner cavity of the detection tank (3) is provided with a plurality of moisture content detection sensors (3.1).
2. The integrated dielectric loss test device according to claim 1, characterized in that: The oil stirring mechanism (4) comprises a driving main shaft (4.1), stirring blades (4.2) and a motor driving component (4.3); the driving main shaft (4.1) is horizontally arranged at the center of the inner cavity of the premix tank (1); the stirring blades (4.2) are evenly arranged outside the driving main shaft (4.1); and the motor driving component (4.3) is drivingly connected to the driving main shaft (4.1).
3. The integrated dielectric loss test device according to claim 1, characterized in that: A horizontally placed oil inlet pipe (1.1) is arranged on the top of the premix tank (1), and a plurality of equidistantly distributed oil delivery holes (1.2) are provided below the oil inlet pipe (1.1).
4. The integrated dielectric loss test device according to claim 1, characterized in that: A plurality of groups of heat exchange tubes (2.2) are evenly arranged between the two groups of partition plates (2.1), and heat exchange gaps are reserved between adjacent heat exchange tubes (2.2).
5. The integrated dielectric loss test device according to claim 1, characterized in that: An oil pump (5) is also installed on the oil pipe between the preheating tank (2) and the premixing tank (1).
6. The integrated dielectric loss test device according to claim 1, characterized in that: A water pump (6) is installed on the water inlet pipe of the preheating tank (2).
7. The integrated dielectric loss test device according to claim 1, characterized in that: An oil unloading hopper is provided at the bottom of the detection tank (3), and a control valve is provided at the oil outlet of the oil unloading hopper.