Cuprous sulfide deposition test device

Abstract

The utility model relates to the technical field of test devices, and discloses a cuprous sulfide deposition test device which comprises a main oil tank, electrodes are arranged on the two sides of the upper end in the main oil tank and are a needle electrode and a plate electrode respectively, and sleeves are arranged between the outer portions of the electrodes and the main oil tank; the partition plate is arranged in the middle of the lower end in the main oil tank, and insulation paper is arranged on the two sides, located in the main oil tank, of the exterior of the partition plate; the heating wires are arranged on two sides of the lower end in the main oil tank; the temperature control cabinets are arranged on the two sides outside the main oil tank, and a power-on thermocouple is arranged on the side, close to the heating wire, of the lower end inside the main oil tank; the exhaust hole is formed in one side of the upper end of the main oil tank; and the oil filling ports are arranged on two sides outside the main oil tank. The cuprous sulfide deposition is tested in different environments in the stainless steel oil tank, so that the monitoring of the penetration process of the cuprous sulfide deposition is convenient and rapid.

Description

TECHNICAL FIELD

[0001] The utility model relates to test device technical field, concretely is a cuprous sulfide deposition test device. BACKGROUND

[0002] In recent years, the safety accidents caused by the insulation failure of the transformer due to the existence of corrosive sulfur in the transformer oil frequently occur at home and abroad, which seriously affects the safe and reliable operation level of the power system. The active sulfide in the transformer oil reacts with the copper wire to generate cuprous sulfide, which adheres to the copper wire and the surface of the insulating paper between the turns, reduces the electrical properties of the insulating paper and further causes the interturn insulation discharge, and then causes the partial breakdown to cause the high-energy arc fault, thereby causing the local pressure to rise rapidly and causing the explosion accident. The active sulfide in the transformer oil reacts with the copper wire to generate cuprous sulfide, which adheres to the copper wire and the surface of the insulating paper, reduces the electrical properties of the insulating paper and further causes the insulation failure.

[0003] In order to reduce the cuprous sulfide induced insulation failure, it is necessary to study the cuprous sulfide deposition mechanism under different environmental conditions of oil-paper insulation, but the common research method is to collect in the field, which has the following shortcomings: 1. The actual operation monitoring period is long, and the data cannot be quickly obtained; 2. The sample diversity and universality are limited by various uncontrollable factors such as geography and climate, therefore a cuprous sulfide deposition test device is proposed. UTILITY MODEL CONTENT

[0004] (I) Technical problem solved

[0005] In view of the deficiencies of the prior art, the utility model provides a cuprous sulfide deposition test device to solve the problems in the background art.

[0006] (II) Technical scheme

[0007] In order to achieve the above purpose, the utility model provides the following technical scheme: a cuprous sulfide deposition test device, comprising:

[0008] A main oil tank, the two sides of the upper end inside the main oil tank are provided with electrodes, the electrodes are needle electrode and plate electrode respectively, and a sleeve is arranged between the outside of the electrode and the main oil tank;

[0009] A partition plate is arranged at the middle position of the lower end inside the main oil tank, and the two sides of the partition plate outside the main oil tank are provided with insulating paper;

[0010] A heating wire is arranged at the two sides of the lower end inside the main oil tank;

[0011] A temperature control cabinet is arranged at the two sides outside the main oil tank, and an electric thermocouple is arranged on the side of the lower end inside the main oil tank close to the heating wire;

[0012] Air extraction hole, set up in the upper end of the main oil tank on one side;

[0013] Oil injection port, set up in the outside of the main oil tank on both sides.

[0014] Preferably, the inside of the lower end of the main oil tank is provided with a grounding wire, and the grounding wire is connected with the main oil tank, which can provide a low impedance path for discharging possible static electricity or fault current.

[0015] Preferably, the outside of the lower end of the main oil tank is provided with a support, and the support is connected with the main oil tank.

[0016] Preferably, the outside of the both sides of the partition plate is provided with a driving motor, and the driving motor is connected with the partition plate, which is used for controlling the rotation of the stirring frame.

[0017] Preferably, the output end of the driving motor is installed with a stirring frame, and the stirring frame is connected with the output end of the driving motor, which is used for promoting the flow of the oil sample through mechanical movement, so as to break the natural convection formed due to temperature gradient, and make the heat distribution of the oil sample more uniform.

[0018] (Three) beneficial effects

[0019] Compared with the prior art, the utility model provides a cuprous sulfide deposition test device, has the following beneficial effects:

[0020] The main oil tank of the utility model is made of stainless steel, which ensures the sealing and avoids the influence of external factors such as light; the inside of the main oil tank is divided into two parts by a stainless steel partition plate, one part of the high-voltage electrode adopts a plate electrode, and the other part of the high-voltage electrode adopts a needle electrode, the interval between the electrodes is kept consistent, and different electric field environments in actual transformers are simulated; a sleeve is arranged between the stainless steel main oil tank and the high-voltage electrode, high-voltage isolation is realized to ensure safety; the heating device is realized by a temperature control cabinet, the working of the heating wire is controlled by measuring the oil sample temperature through a thermocouple, so that the temperature of the insulating oil is accurately controlled; the circulation device is used to change the oil flow speed, and different oil flow speeds are realized by controlling the oil circulation speed, the test of the cuprous sulfide deposition and penetration process under different environments is realized through the above-mentioned mode, the monitoring period is short, and the problems in the background technology are solved. ACCURACY

[0021] Figure 1 It is the overall structure front view of the utility model;

[0022] Figure 2 It is the main oil tank structure section view of the utility model;

[0023] Figure 3 It is the overall structure bottom view of the utility model.

[0024] In the figure: 1, main oil tank; 2, electrode; 3, sleeve; 4, heating wire; 5, insulating paper; 6, partition; 7, driving motor; 8, stirring frame; 9, grounding wire; 10, oil injection port; 11, air extraction hole; 12, support; 13, temperature control cabinet; 14, electric thermocouple. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The present application provides a technical scheme, a cuprous sulfide deposition test device, please refer to Figure 1 、 Figure 2 and Figure 3 , comprising:

[0027] The main oil tank 1, the two sides of the upper end inside the main oil tank 1 are provided with electrodes 2, the electrodes 2 are needle electrode and plate electrode respectively, and the electrodes 2 are provided with sleeves 3 between the electrodes 2 and the main oil tank 1 outside;

[0028] The partition 6 is arranged at the middle position of the lower end inside the main oil tank 1, and the insulating paper 5 is arranged on both sides of the partition 6 outside the main oil tank 1;

[0029] The heating wire 4 is arranged on both sides of the lower end inside the main oil tank 1;

[0030] The temperature control cabinet 13 is arranged on both sides of the main oil tank 1 outside, and the electric thermocouple 14 is arranged on one side of the lower end inside the main oil tank 1 close to the heating wire 4;

[0031] The air extraction hole 11 is arranged on one side of the upper end of the main oil tank 1;

[0032] The oil injection port 10 is arranged on both sides of the main oil tank 1 outside.

[0033] Please refer to Figure 1 、 Figure 2 and Figure 3 , the inside of the lower end of the main oil tank 1 is provided with the grounding wire 9, and the grounding wire 9 is connected with the main oil tank 1, and the grounding can provide a low impedance path for discharging possible static electricity or fault current.

[0034] Please refer to Figure 1 , the outside of the lower end of the main oil tank 1 is provided with the support 12, and the support 12 is connected with the main oil tank 1.

[0035] Please refer to Figure 2The two sides of the partition plate 6 are provided with driving motors 7, and the driving motors 7 are connected with the partition plate 6, and the driving motors 7 are used for controlling the rotation of the stirring frame 8.

[0036] Please refer to Figure 2 The output end of the driving motor 7 is provided with the stirring frame 8, and the stirring frame 8 is connected with the output end of the driving motor 7, and the stirring frame 8 is used for promoting the oil sample to flow through mechanical movement, so as to break the natural convection formed due to the temperature gradient, and make the heat in the oil sample more evenly distributed.

[0037] In the scheme, the container for placing the insulating oil paper is placed in a humid environment to change the moisture content before the test preparation, nitrogen is introduced into the insulating oil to change the oxygen content, which is used to realize the simulation of different oxygen and moisture conditions. During the test, the main oil tank 1 is first subjected to vacuum treatment through the air outlet hole 11, and then the insulating oil prepared above is evenly divided and injected into the two sides of the main oil tank 1 through the two oil injection ports 10, and the accelerated aging test is carried out. By setting different temperatures and aging times, the simulation of different temperature and aging degree conditions is realized. By applying different voltages and using different electrode 2 shapes, the simulation of different electric field environments is realized. During the aging process, the corrosive sulfur content in the oil paper insulation increases, and under the combined action of electricity and heat, the corrosive sulfur and copper are catalyzed to generate cuprous sulfide. Set the time node, detect the deposition state of cuprous sulfide and the insulation aging characteristic parameters at each time node, observe the surface morphology change of the insulating paper 5 and the mass fraction and deposition position of cuprous sulfide by using a scanning electron microscope, measure the aging characteristic parameters of the insulating oil color, breakdown voltage, the degree of polymerization of the insulating paper 5, the recovery voltage, the FDS curve, and the insulating oil oxidation initiation temperature, furfural content, acid value, moisture, resistivity, etc. The change rule of the deposition state of cuprous sulfide and the degree of insulation medium defect is obtained. Through multiple tests, different voltage amplitudes and polarities, oil sample composition, oxygen, moisture content, and electric-thermal stress, aging temperature, and aging time are set, and the correlation mechanism of the different deposition states of cuprous sulfide and the metal surface, vegetable oil, and insulating paper 5 aging characteristic parameters under the influence of environmental factors is tested and compared. Thus, a basis is provided for selecting appropriate decoupling characteristic quantities to establish a mechanism for quantitatively representing the severity of insulation defects caused by cuprous sulfide deposition.

[0038] It should be noted that, in the present document, the terms such as first and second, etc., are used merely to differentiate one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0039] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A cuprous sulfide deposition test device characterized by comprising: Include: The main oil tank (1), both sides of the upper end inside the main oil tank (1) are provided with electrodes (2), the electrodes (2) are needle electrode and plate electrode respectively, the outside of the electrode (2) is provided with a sleeve (3) between the main oil tank (1); The baffle (6) is arranged at the middle position of the lower end inside the main oil tank (1), the outside of the baffle (6) is provided with insulating paper (5) on both sides of the inside of the main oil tank (1); The heating wire (4) is arranged on both sides of the lower end inside the main oil tank (1); The temperature control cabinet (13) is arranged on both sides of the outside of the main oil tank (1), the side of the lower end inside the main oil tank (1) close to the heating wire (4) is provided with the electric heating couple (14); The air extraction hole (11) is arranged on one side of the upper end of the main oil tank (1); The oil inlet (10) is arranged on both sides of the outside of the main oil tank (1). The inside of the lower end of the main oil tank (1) is provided with the ground wire (9), and the ground wire (9) is connected with the main oil tank (1). The outside of the lower end of the main oil tank (1) is provided with the support (12), and the support (12) is connected with the main oil tank (1). Both sides of the outside of the baffle (6) are provided with the driving motor (7), and the driving motor (7) is connected with the baffle (6). The output end of the driving motor (7) is provided with the stirring frame (8), and the stirring frame (8) is connected with the output end of the driving motor (7). ​ 2. A cuprous sulfide deposition test device according to claim 1, characterized in that: ​ 3. A cuprous sulfide deposition test device according to claim 1, characterized by: ​ 4. A cuprous sulfide deposition test device according to claim 1, characterized by: ​ 5. A cuprous sulfide deposition test device according to claim 4, characterized in that: ​

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