Insulating oil dielectric loss and resistivity testing device

Abstract

The utility model relates to the technical field of insulating oil testing equipment, in particular to an insulating oil dielectric loss and resistivity testing device which comprises an electrode cup, the electrode cup comprises an outer electrode, an inner electrode and a locking cover, the outer electrode is of a cylinder structure, a cavity is formed in the middle of the outer electrode, and the inner electrode is arranged in the cavity of the outer electrode. A gap is formed between the inner electrode and the outer electrode, the upper portion of the inner electrode is connected with a circular sealing plate, the circular sealing plate is supported by the top end face of the outer electrode, the locking cover is installed on the upper portion of the outer electrode and can lock the inner electrode and the outer electrode, and the circular sealing plate of the inner electrode is connected with a temperature sensor. And the detection end of the temperature sensor extends into a gap between the inner electrode and the outer electrode. According to the utility model, the detection end of the temperature sensor directly extends into the oil in the gap between the inner electrode and the outer electrode, the result detected by the temperature sensor is most direct and accurate, and the temperature sensor is mounted at the upper position, so that the temperature sensor is convenient to mount, dismount and maintain.

Description

Technical Field

[0001] This utility model relates to the technical field of insulating oil testing equipment, specifically an insulating oil dielectric loss and resistivity testing device. Background Technology

[0002] Measuring the dielectric loss and resistivity of insulating oil is a crucial quality indicator for assessing its quality. Existing measurement methods primarily utilize electrode cup structures, including internal and external electrodes. However, existing electrode cup structures suffer from the following problems: First, during testing, the insulating oil inside the electrode cup must be heated to 90°C. Therefore, monitoring the oil temperature is essential. Current technologies typically measure the temperature of the internal electrode as the insulating oil temperature parameter, but this indirect monitoring method cannot accurately obtain the actual oil temperature and may introduce errors in practice. Second, the significant temperature difference between the upper and lower parts of the insulating oil within the electrode cup leads to discrepancies between the set temperature and the actual oil temperature. Third, after testing, residual oil remains in the electrode cup. Existing structures cannot thoroughly and effectively rinse the oil sample, contaminating subsequent samples and resulting in inaccurate test results. Fourth, most existing technologies use an aluminum bath to heat the electrode cup and its internal insulating oil, resulting in low heating efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a device for testing the dielectric loss and resistivity of insulating oil.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] An insulating oil dielectric loss and resistivity testing device includes an electrode cup, which comprises an outer electrode, an inner electrode, and a locking cover. The outer electrode has a cylindrical structure with a cavity in the middle. The inner electrode is disposed inside the cavity of the outer electrode, and there is a gap between the inner electrode and the outer electrode. A circular sealing plate is connected to the upper part of the inner electrode, and the circular sealing plate is supported by the top end face of the outer electrode. The locking cover is installed on the upper part of the outer electrode and can lock the inner electrode and the outer electrode. A temperature sensor is connected to the circular sealing plate of the inner electrode, and the detection end of the temperature sensor extends into the gap between the inner electrode and the outer electrode.

[0006] The circular sealing plate is connected to an oil inlet connector and an oil outlet connector respectively. The oil inlet connector is connected to a sample inlet pipe, which is equipped with a first control valve. The oil outlet connector is connected to a circulation pipe, which is equipped with a second control valve. The bottom of the outer electrode is equipped with an oil drain port, which is connected to the gap between the inner electrode and the outer electrode. The oil drain port is connected to an oil drain pipe, which is equipped with a third control valve and a gear pump. The oil drain pipe is connected to the circulation pipe.

[0007] The oil outlet connector is also connected to an oil outlet pipe, which is equipped with a fourth control valve. The oil outlet pipe is connected to the drain pipe and is connected to the front end of the gear pump input.

[0008] The drain pipe is connected to the waste oil tank, and a fifth control valve is connected to the end of the drain pipe near the waste oil tank.

[0009] The oil inlet connector is connected to the air intake pipe, and a sixth control valve is installed on the air intake pipe.

[0010] A liquid level sensor is installed on the oil outlet pipe.

[0011] The insulating oil dielectric loss and resistivity testing device also includes an electromagnetic induction heating coil, and the electrode cup can be placed inside the electromagnetic induction heating coil, which can heat the inside of the electrode cup.

[0012] The locking cover is connected to a measurement signal line connector, which extends into the interior of the inner electrode.

[0013] The beneficial effects achieved by this utility model are:

[0014] In this invention, the detection end of the temperature sensor extends directly into the oil in the gap between the inner and outer electrodes. The temperature sensor detects the most direct and accurate results. Furthermore, the temperature sensor is installed in the upper position, which facilitates installation, disassembly, and maintenance.

[0015] In this invention, the oil drain port, oil drain pipe, gear pump, circulation pipe and oil outlet connector can form a circulation pipeline. During the heating process, the gear pump circulates the oil between the inner and outer electrodes through the circulation pipeline, which facilitates uniform heating of the oil and avoids uneven heating in certain areas.

[0016] In this invention, the gear pump can completely extract the oil from the previous test through the oil outlet and oil outlet pipes. The next batch of oil to be tested is partially injected into the electrode cup, rinsed, and then extracted again before being stored in the waste oil tank. Then a new round of testing is performed. The above process can improve the accuracy of the test.

[0017] This invention uses electromagnetic heating, which has high heating efficiency. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1This is a schematic diagram of the electrode cup of this utility model (top view).

[0020] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 1 (AA sectional view).

[0021] Figure 3 yes Figure 1 BB cross-sectional view.

[0022] In the diagram: 1. Inner electrode; 2. Outer electrode; 3. Temperature sensor; 4. Measurement signal line connector; 5. Oil inlet connector; 6. Oil outlet connector; 7. Locking cap; 8. Oil drain port; 9. Electromagnetic induction heating coil; 10. Liquid level sensor; 11. Sixth control valve; 12. Sample inlet pipe; 13. Air inlet pipe; 14. Circulation pipe; 15. Oil outlet pipe; 16. Fourth control valve; 17. Second control valve; 18. Oil drain pipe; 19. Third control valve; 20. Gear pump; 21. Fifth control valve; 22. Waste oil drum; 23. First control valve; 24. Circular sealing plate. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] Example:

[0025] like Figures 1-3 As shown, an insulating oil dielectric loss and resistivity testing device includes an electrode cup, which comprises an outer electrode 2, an inner electrode 1, and a locking cover 7. The outer electrode 2 has a cylindrical structure with a cavity in the middle. The inner electrode 1 is disposed inside the cavity of the outer electrode 2, and there is a gap between the inner electrode 1 and the outer electrode 2. A circular sealing plate 24 is connected to the upper part of the inner electrode 1. The circular sealing plate 24 is supported by the top end face of the outer electrode 2 and can seal the cavity of the outer electrode 2. The locking cover 7 is installed on the upper part of the outer electrode 2 and can lock the inner electrode 1 and the outer electrode 2. Specifically, the locking cover 7 can be threaded to the outer surface of the outer electrode 2, thereby locking the inner electrode 1 to the top end face of the outer electrode 2, so that the inner and outer electrodes 2 are tightly connected. Both the outer electrode 2 and the inner electrode 1 can use conventional structures of existing technology.

[0026] A temperature sensor 3 is connected to the circular sealing plate 24 of the inner electrode 1. The detection end of the temperature sensor 3 extends into the gap between the inner electrode 1 and the outer electrode 2. The detection end of the temperature sensor 3 extends directly into the oil in the gap between the inner electrode 1 and the outer electrode 2, so the result detected by the temperature sensor 3 is the most direct and accurate.

[0027] The circular sealing plate 24 is connected to an oil inlet connector 5 and an oil outlet connector 6. The oil inlet connector 5 is connected to the sample inlet pipe 12, and the sample inlet pipe 12 is equipped with a first control valve 23. The oil outlet connector 6 is connected to the circulation pipe 14, and the circulation pipe 14 is equipped with a second control valve 17. The bottom of the outer electrode 2 is equipped with an oil drain port 8. The gap between the inner electrode 1 and the outer electrode 2 is connected to the oil drain port 8. The oil drain port 8 is connected to the oil drain pipe 18, and the oil drain pipe 18 is equipped with a third control valve 19 and a gear pump 20. The oil drain pipe 18 is connected to the circulation pipe 14.

[0028] In the above structure, the oil drain port 8, oil drain pipe 18, gear pump 20, circulation pipe 14 and oil outlet connector 6 can form a circulation pipeline. The gear pump 20 can make the oil in the gap between the inner electrode 1 and the outer electrode 2 circulate. During the heating process, the oil circulates, which facilitates uniform heating of the oil and avoids uneven heating in some areas.

[0029] The oil outlet connector 6 is also connected to the oil outlet pipe 15, which is equipped with a fourth control valve 16. The oil outlet pipe 15 is connected to the oil drain pipe 18 and is connected to the front end of the input end of the gear pump 20. The oil drain pipe 18 is connected to the waste oil tank 22, and a fifth control valve 21 is connected to the end of the oil drain pipe 18 near the waste oil tank 22.

[0030] In the above structure, the gear pump 20 can completely extract the oil from the previous test through the oil outlet pipe 15 and the oil discharge pipe 18. Before the next test, a portion of the oil to be tested is injected to flush the gaps in the electrode cup. After being cleaned again, it is stored in the waste oil tank 22, and then a new round of testing is carried out to ensure the accuracy of the test.

[0031] The oil inlet connector 5 is connected to the air inlet pipe 13. The air inlet pipe 13 is equipped with a sixth control valve 11. When performing the above-mentioned oil draining or flushing operations, the air inlet pipe 13 vents the inner cavity of the electrode cup to avoid negative pressure inside the electrode cup.

[0032] A liquid level sensor 10 is installed on the oil outlet pipe 15 to detect the liquid level in the electrode cup.

[0033] The insulating oil dielectric loss and resistivity testing device also includes an electromagnetic induction heating coil 9. When heating is required, the electrode cup is placed inside the electromagnetic induction heating coil 9. When the electromagnetic induction heating coil 9 is energized, it can heat the inside of the electrode cup through magnetic field induction.

[0034] The locking cover 7 is connected to a measurement signal line connector 4, which extends into the interior of the inner electrode 1 to facilitate the installation of signal lines inside the inner electrode 1.

Claims

1. An insulating oil dielectric loss and resistivity testing device, comprising an electrode cup, the electrode cup including an outer electrode (2), an inner electrode (1), and a locking cover (7), wherein the outer electrode (2) is a cylindrical structure with a cavity in the middle, the inner electrode (1) is disposed inside the cavity of the outer electrode (2), and there is a gap between the inner electrode (1) and the outer electrode (2), characterized in that, The inner electrode (1) is connected to a circular sealing plate (24) at its upper part. The circular sealing plate (24) is supported by the top end face of the outer electrode (2). The locking cover (7) is installed on the upper part of the outer electrode (2) and can lock the inner electrode (1) and the outer electrode (2). A temperature sensor (3) is connected to the circular sealing plate (24) of the inner electrode (1). The detection end of the temperature sensor (3) extends into the gap between the inner electrode (1) and the outer electrode (2).

2. The dielectric loss and resistivity testing device of claim 1, wherein, The circular sealing plate (24) is connected to an oil inlet connector (5) and an oil outlet connector (6). The oil inlet connector (5) is connected to the sample inlet pipe (12). The sample inlet pipe (12) is equipped with a first control valve (23). The oil outlet connector (6) is connected to the circulation pipe (14). The circulation pipe (14) is equipped with a second control valve (17). The bottom of the outer electrode (2) is equipped with an oil drain port (8). The gap between the inner electrode (1) and the outer electrode (2) is connected to the oil drain port (8). The oil drain port (8) is connected to the oil drain pipe (18). The oil drain pipe (18) is equipped with a third control valve (19) and a gear pump (20). The oil drain pipe (18) is connected to the circulation pipe (14).

3. The dielectric loss and resistivity testing device of claim 2, wherein, The oil outlet connector (6) is also connected to the oil outlet pipe (15), and a fourth control valve (16) is provided on the oil outlet pipe (15). The oil outlet pipe (15) is connected to the oil drain pipe (18) and connected to the front end of the input end of the gear pump (20).

4. The dielectric loss and resistivity testing device of claim 3, wherein, The oil drain pipe (18) is connected to the waste oil drum (22), and a fifth control valve (21) is connected to one end of the oil drain pipe (18) near the waste oil drum (22).

5. The dielectric loss and resistivity testing device of claim 3, wherein, The oil inlet connector (5) is connected to the air intake pipe (13), and a sixth control valve (11) is installed on the air intake pipe (13).

6. The dielectric loss and resistivity testing device of claim 3, wherein, A liquid level sensor (10) is installed on the oil outlet pipe (15).

7. The dielectric loss and resistivity testing device of claim 1, wherein, It also includes an electromagnetic induction heating coil (9), and the electrode cup can be placed inside the electromagnetic induction heating coil (9), which can heat the inside of the electrode cup.

8. The dielectric loss and resistivity testing device of claim 1, wherein, The circular sealing plate (24) is connected to a measurement signal line connector (4), which extends into the interior of the inner electrode (1).

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