Online insulating oil breakdown voltage tester

Abstract

The online insulating oil breakdown voltage tester comprises a control system, a high voltage generator, an oil cup, a cup cover, a first electrode and a second electrode, the oil cup is provided with an oil cavity, and the upper end of the oil cavity is open; the cup cover detachably covers the upper end of the oil cup and seals the oil cavity, a first binding post and a second binding post penetrate through the cup cover, and the lower end of the first binding post and the lower end of the second binding post are located in the oil cavity; the first electrode is detachably mounted at the lower end of the first binding post, and the first electrode is electrically connected with the high-voltage generator through the first binding post; the second electrode is detachably installed at the lower end of the second binding post, the second electrode is electrically connected with the high-voltage generator through the second binding post, and the first electrode and the second electrode are oppositely arranged. According to the on-line insulating oil breakdown voltage tester provided by the invention, the two electrodes can be taken out of the oil cup at the same time only by taking down the cup cover from the oil cup from the outside of the oil cup, so that the electrodes are easier and more convenient to maintain.

Description

Technical Field

[0001] This invention relates to the field of insulating oil breakdown voltage testing technology, and particularly to an online insulating oil breakdown voltage tester. Background Technology

[0002] Existing insulating oil breakdown voltage testers typically consist of a high-voltage generator, an oil cup, electrode assemblies, and a control system. The control system directs the high-voltage generator to output a test voltage to the two electrodes inside the oil cup to perform a breakdown voltage test on the insulating oil. Finally, the control system displays the obtained breakdown voltage. However, the electrodes in existing equipment are mostly directly embedded inside the oil cup cavity. When maintenance operations such as cleaning, repair, or replacement of the electrodes are required, the limited space within the oil cup makes the operation difficult and inconvenient, affecting the maintenance efficiency of the equipment. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an online insulating oil breakdown voltage tester, which allows both the first and second electrodes to be removed from the oil cup simultaneously simply by removing the cup cover from the outside of the oil cup, making electrode maintenance simpler and more convenient.

[0004] An online insulating oil breakdown voltage tester according to an embodiment of the present invention includes a control system, a high-voltage generator, an oil cup, a cup cover, a first electrode, and a second electrode. The high-voltage generator is electrically connected to the control system. The oil cup has an oil cavity with an opening at its upper end. The cup cover is detachably placed on the upper end of the oil cup and closes the oil cavity. A first terminal and a second terminal are provided through the cup cover. The lower ends of the first terminal and the second terminal are located inside the oil cavity. The first electrode is detachably installed on the lower end of the first terminal and is electrically connected to the high-voltage generator through the first terminal. The second electrode is detachably installed on the lower end of the second terminal and is electrically connected to the high-voltage generator through the second terminal. The first electrode and the second electrode are arranged opposite to each other.

[0005] The online insulating oil breakdown voltage tester according to embodiments of the present invention has at least the following beneficial effects: The online insulating oil breakdown voltage tester provided by the present invention has a first electrode detachably installed on a first terminal and a second electrode detachably installed on a second terminal, and the first terminal and the second terminal are inserted through a cup cover. Therefore, when the electrodes need to be maintained, the cup cover can be removed from the oil cup from the outside, and both the first electrode and the second electrode can be removed from the oil cup at the same time, making electrode maintenance simpler and more convenient.

[0006] According to some embodiments of the present invention, the first electrode is movably mounted on the lower end of the first terminal, the second electrode is movably mounted on the lower end of the second terminal, and the first electrode and the second electrode can slide closer to or further apart relative to each other.

[0007] According to some embodiments of the present invention, a first insertion hole is provided at the lower end of the first terminal, one end of the first electrode is slidably inserted into the first insertion hole, and a first locking bolt is screwed onto the side wall of the first insertion hole, the first locking bolt abutting against one end of the first electrode.

[0008] According to some embodiments of the present invention, a second insertion hole is provided at the lower end of the second terminal, one end of the second electrode is slidably inserted into the second insertion hole, and a second locking bolt is screwed onto the side wall of the second insertion hole, the second locking bolt abutting against one end of the second electrode.

[0009] According to some embodiments of the present invention, the upper end of the oil cup is provided with at least two positioning posts, and the cup cover is provided with at least two positioning grooves. All the positioning posts are correspondingly embedded in all the positioning grooves, so that the cup cover is detachably fixed to the oil cup.

[0010] According to some embodiments of the present invention, a sealing structure is provided between the cup lid and the oil cup.

[0011] According to some embodiments of the present invention, the online insulating oil breakdown voltage tester further includes a pumping device. The oil cup is provided with an oil inlet pipe and an oil outlet pipe, both of which are connected to the oil chamber. A first control valve is provided on the oil outlet pipe, which is used to control the opening and closing of the oil outlet pipe. The pumping device is used to drive the insulating oil from the oil inlet pipe into the oil chamber. The first control valve and the pumping device are both electrically connected to the control system.

[0012] According to some embodiments of the present invention, the pumping device is configured as a vacuum pump, the vacuum pump is connected to the oil chamber, the oil inlet pipeline is provided with a second control valve, the oil cup is provided with a level switch for detecting the liquid level in the oil chamber, and the second control valve is electrically interlocked with the level switch.

[0013] According to some embodiments of the present invention, the oil cup is provided with a heating device for heating the insulating oil in the oil cavity, and the heating device is electrically connected to the control system.

[0014] According to some embodiments of the present invention, the oil cup is provided with a stirring device for stirring the insulating oil in the oil chamber, and the stirring device is electrically connected to the control system.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the online insulating oil breakdown voltage tester according to an embodiment of the present invention; Figure 2 for Figure 1 The diagram shown is an exploded view of the oil cup and lid of the online insulating oil breakdown voltage tester. Figure 3 for Figure 1 A schematic diagram of the oil cup in the online insulating oil breakdown voltage tester.

[0017] Figure label: Control system 110, high pressure generator 120, detection and protection circuit 130, oil cup 210, oil chamber 211, positioning post 212, oil inlet pipe 213, oil outlet pipe 214, cup cover 220, positioning groove 221, first terminal 230, first insertion hole 231, first locking bolt 240, second terminal 250, second locking bolt 260, first electrode 270, second electrode 280, pumping device 300, heating device 400, stirring device 500, liquid level switch 610, first control valve 620, second control valve 630. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 3 According to an embodiment of the present invention, an online insulating oil breakdown voltage tester includes a control system 110, a high-voltage generator 120, an oil cup 210, a cup cover 220, a first electrode 270, and a second electrode 280. The high-voltage generator 120 is electrically connected to the control system 110. The oil cup 210 has an oil cavity 211 with an opening at its upper end. The cup cover 220 is detachably mounted on the upper end of the oil cup 210 and closes the oil cavity 211. The cup cover 220 has a first terminal 230 and a second terminal 25 passing through it. 0. The lower ends of the first terminal 230 and the second terminal 250 are located within the oil cavity 211; the first electrode 270 is detachably mounted on the lower end of the first terminal 230, and the first electrode 270 is electrically connected to the high-voltage generator 120 through the first terminal 230; the second electrode 280 is detachably mounted on the lower end of the second terminal 250, and the second electrode 280 is electrically connected to the high-voltage generator 120 through the second terminal 250, with the first electrode 270 and the second electrode 280 positioned opposite each other. It should be noted that... Figure 1 The dashed lines between the control system 110 and other devices indicate the electrical connections between the control system 110 and other devices.

[0023] The online insulating oil breakdown voltage tester provided by this invention has a first electrode 270 detachably mounted on a first terminal 230 and a second electrode 280 detachably mounted on a second terminal 250. The first terminal 230 and the second terminal 250 are inserted through a cup cover 220. Thus, when the electrodes need maintenance, it is only necessary to remove the cup cover 220 from the outside of the oil cup 210 to remove both electrodes 270 and 280 from the oil cup 210 at the same time, making electrode maintenance simpler and more convenient.

[0024] In practical implementation, the electrodes used for breakdown voltage testing usually include three types: flat plate, hemispherical, and spherical. The online insulating oil breakdown voltage tester provided by this invention can flexibly replace the first electrode 270 or the second electrode 280 with one of the flat plate electrode, hemispherical electrode, or spherical electrode according to actual needs. The replacement is convenient and simple, and the cost of use is low.

[0025] In the specific implementation process, the cup lid 220 and the oil cup 210 are insulated to facilitate the insulation oil breakdown voltage test.

[0026] Reference Figure 1 In some embodiments, the control system 110 is provided with a detection and protection circuit 130. The detection and protection circuit 130 monitors the current in the circuit formed by the high voltage generator 120 and the first electrode 270 and the second electrode 280 in real time. When a breakdown occurs between the first electrode 270 and the second electrode 280, the current will increase sharply. The detection and protection circuit 130 will detect the current change within a few milliseconds and immediately send a signal to the control system 110, so that the control system 110 cuts off the high voltage generator 120 to prevent continuous arcing from damaging the electrodes and the insulating oil in the oil cup 210.

[0027] Reference Figure 2 According to some embodiments of the present invention, the first electrode 270 is movably mounted on the lower end of the first terminal 230, and the second electrode 280 is movably mounted on the lower end of the second terminal 250. The first electrode 270 and the second electrode 280 can slide closer to or further apart relative to each other. With the above arrangement, the distance between the first electrode 270 and the second electrode 280 can be adjusted according to actual needs.

[0028] Reference Figure 2 According to some embodiments of the present invention, a first insertion hole 231 is provided at the lower end of the first terminal 230. One end of the first electrode 270 is slidably inserted into the first insertion hole 231. A first locking bolt 240 is screwed onto the side wall of the first insertion hole 231. The first locking bolt 240 abuts against one end of the first electrode 270. Therefore, tightening or loosening the first locking bolt 240 can lock or unlock the first electrode 270, making the first electrode 270 fixed or slidable. With the above configuration, the first electrode 270 and the first terminal 230 are simple and convenient to assemble and disassemble, and the first electrode 270 is allowed to slide, thereby realizing the adjustment of the distance between the first electrode 270 and the second electrode 280.

[0029] Reference Figure 2According to some embodiments of the present invention, a second insertion hole is provided at the lower end of the second terminal 250, and one end of the second electrode 280 is slidably inserted into the second insertion hole. A second locking bolt 260 is screwed onto the side wall of the second insertion hole, and the second locking bolt 260 abuts against one end of the second electrode 280. Therefore, tightening or loosening the second locking bolt 260 can lock or unlock the second electrode 280, making the second electrode 280 fixed or slidable. With the above configuration, the first electrode 270 and the first terminal 230 are simple and convenient to assemble and disassemble, and the first electrode 270 is allowed to slide, thereby realizing the adjustment of the distance between the first electrode 270 and the second electrode 280.

[0030] In other embodiments, the first electrode 270 and the second electrode 280 may also be installed in other ways. For example, the first electrode 270 may be directly screwed into the first insertion hole 231, and the second electrode 280 may be directly screwed into the second insertion hole. In this way, the first electrode 270 and the first terminal 230 can be detachably installed, and the second electrode 280 and the second terminal 250 can be detachably installed, and the distance between the first electrode 270 and the second electrode 280 can be precisely adjusted.

[0031] Reference Figure 2 and Figure 3 According to some embodiments of the present invention, the upper end of the oil cup 210 is provided with at least two positioning posts 212, and the cup cover 220 is provided with at least two positioning grooves 221. All the positioning posts 212 are correspondingly embedded in all the positioning grooves 221, so that the cup cover 220 is detachably fixed to the oil cup 210. With the above configuration, the cup cover 220 and the oil cup 210 are easy and simple to assemble and disassemble.

[0032] It is conceivable that in other embodiments, the cup lid 220 may also be installed in other ways, for example, the cup lid 220 may be installed on the oil cup 210 by means of threads.

[0033] According to some embodiments of the present invention, a sealing structure is provided between the cup lid 220 and the oil cup 210 to ensure that the inside of the oil cup 210 is isolated from the outside, and to prevent air, moisture and particulate matter in the external environment from contaminating the insulating oil in the oil cavity 211.

[0034] Specifically, the sealing structure may include an elastic sealing ring, which can be installed on the cup lid 220 or on the upper end of the oil cup 210, and the elastic sealing ring is arranged circumferentially around the opening of the oil cavity 211.

[0035] According to some embodiments of the present invention, the online insulating oil breakdown voltage tester is equipped with a high-voltage interlock system, which interlocks the cup cover 220 with the high-voltage generator 120: when the cup cover 220 is removed from the oil cup 210, the high-voltage interlock system simultaneously shuts off the high-voltage generator 120 or cuts off the electrical connection between the high-voltage generator 120 and the first electrode 270 and the second electrode 280.

[0036] In some embodiments, the high-voltage interlock system may include a relay switch and a trigger switch. The aforementioned elastic sealing ring is installed on the upper end of the oil cup 210, and the trigger switch is installed on the lower end of the elastic sealing ring. The relay switch is located on the power supply line of the high-voltage generator 120. When the cup cover 220 is installed on the oil cup 210, the cup cover 220 can press against the trigger switch through the elastic sealing ring. The trigger switch can trigger the relay switch to control the power supply line of the high-voltage generator 120 to be in a closed state. When the cup cover 220 leaves the oil cup 210, the elastic sealing ring no longer presses against the trigger switch, so that the trigger switch triggers the relay switch to control the power supply line of the high-voltage generator 120 to be in a closed state, cutting off the power supply to the high-voltage generator 120.

[0037] Reference Figure 1 According to some embodiments of the present invention, the online insulating oil breakdown voltage tester further includes a pumping device 300. The oil cup 210 is provided with an oil inlet pipe 213 and an oil outlet pipe 214. Both the oil inlet pipe 213 and the oil outlet pipe 214 are connected to the oil chamber 211. A first control valve 620 is provided on the oil outlet pipe 214. The first control valve 620 is used to control the opening and closing of the oil outlet pipe 214. The pumping device 300 is used to drive the insulating oil from the oil inlet pipe 213 into the oil chamber 211. The first control valve 620 and the pumping device 300 are both electrically connected to the control system 110. With the above configuration, the oil cup 210 can be directly connected to the equipment under test, such as a transformer or a vacuum oil filter, through the oil inlet pipe 213. Then, the insulating oil to be tested from the equipment under test is pumped into the oil cup 210 by the pumping device 300, thereby directly obtaining the insulating oil sample for testing. No additional sampling and preservation are required, which is very convenient and does not affect the operation of the equipment under test, realizing online testing. Therefore, the online insulating oil breakdown voltage tester provided by this invention can eliminate the existing process of "manual sampling, manual delivery, and manual inspection," avoiding contamination of the oil at each stage during manual operation, realizing "automatic sampling" and "precise testing," making the test results more timely and accurate. Operators can obtain accurate indicators of the insulating oil in a timely manner, guiding the production process to stop relevant equipment in a timely manner, avoiding more wasted time and energy.

[0038] In practice, the oil outlet pipe 214 can be connected back to the device under test or to the outside world so that the insulating oil can be returned to the device under test or discharged to the outside world after the test is completed.

[0039] According to some embodiments of the present invention, the pumping device 300 is configured as a vacuum pump, which is connected to the oil chamber 211. A second control valve 630 is provided in the oil inlet pipe 213, and a level switch 610 for detecting the liquid level in the oil chamber 211 is provided in the oil cup 210. The second control valve 630 is electrically interlocked with the level switch 610. Therefore, when the liquid level in the oil chamber 211 reaches the expected level, the level switch 610 is triggered. Then, the level switch 610 can trigger the second control valve 630 to automatically close the oil inlet pipe 213, thereby ensuring a consistent volume of insulating oil entering the oil cup 210 each time, maintaining constant test conditions, and obtaining more accurate test results. By evacuating the oil chamber 211 using the vacuum pump, a negative pressure is created within the oil chamber 211, allowing insulating oil to be drawn in from the oil inlet pipe 213. Simultaneously, air and moisture within the oil chamber 211 are also removed, reducing contamination sources within the oil chamber 211.

[0040] According to some embodiments of the present invention, the oil cup 210 is provided with a heating device 400 for heating the insulating oil in the oil chamber 211, and the heating device 400 is electrically connected to the control system 110. The heating device 400 can maintain the temperature of the insulating oil in the oil cup 210 within a certain range, avoiding the influence of excessively low ambient temperature on the detection.

[0041] In specific implementation, the heating device 400 can be a constant temperature electric heating rod, or it can be a water bath heater or other heating device 400.

[0042] According to some embodiments of the present invention, the oil cup 210 is provided with a stirring device 500 for stirring the insulating oil in the oil chamber 211, and the stirring device 500 is electrically connected to the control system 110. Using the above method, the stirring device 500 can be automatically controlled to stir the oil sample in the oil cup 210, which can eliminate carbon particles generated during the previous breakdown, restore the oil sample to a uniform state, and then allow it to stand for a period of time before the next test, ensuring more accurate results between the two tests.

[0043] In practical implementation, the stirring device 500 is a magnetic stirrer. A magnetic stirrer typically includes a magnetic stirring element and a magnetic actuator. The magnetic stirring element is rotatably mounted inside the oil chamber 211, while the magnetic actuator is mounted outside the oil chamber 211. The magnetic actuator drives the magnetic stirring element to rotate via magnetic force. Using a magnetic stirrer eliminates the need to drill a hole in the bottom of the oil cup 210 to install the rotating shaft of the stirring device 500, thus preventing oil leakage.

[0044] In practical implementation, the control system 110 may include a main control circuit board and a human-machine interface device. The main control circuit board is equipped with a microprocessor to set parameters required for testing, such as voltage ramp-up rate and oil settling time. It controls various components of the online insulating oil breakdown voltage tester, receives breakdown signals, records breakdown voltage values, calculates average values, stores, and outputs test data. The human-machine interface device mainly includes a display. When the display is a touchscreen, various operation buttons can be omitted; when the display is not a touchscreen, the human-machine interface device still includes various buttons.

[0045] In some embodiments, the online insulating oil breakdown voltage tester may also include a power supply module that is independent of the power grid, providing power for more flexible use.

[0046] In some embodiments, the online insulating oil breakdown voltage tester may further include a chassis, with at least a portion of the control system 110 and the high-voltage generator 120 installed inside the chassis. The chassis protects the internal components and isolates the high-voltage generator 120 from external operators to ensure operator safety.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An online insulating oil breakdown voltage tester, characterized in that, include: Control system (110); A high-voltage generator (120) is electrically connected to the control system (110); An oil cup (210) has an oil cavity (211) with an opening at the upper end of the oil cavity (211); A cup lid (220) is detachably mounted on the upper end of the oil cup (210) and closes the oil cavity (211). The cup lid (220) is provided with a first terminal (230) and a second terminal (250). The lower ends of the first terminal (230) and the second terminal (250) are located inside the oil cavity (211). The first electrode (270) is detachably mounted on the lower end of the first terminal (230), and the first electrode (270) is electrically connected to the high voltage generator (120) through the first terminal (230); The second electrode (280) is detachably mounted on the lower end of the second terminal (250). The second electrode (280) is electrically connected to the high voltage generator (120) through the second terminal (250). The first electrode (270) is arranged opposite to the second electrode (280).

2. The online insulating oil breakdown voltage tester according to claim 1, characterized in that, The first electrode (270) is movably mounted on the lower end of the first terminal (230), and the second electrode (280) is movably mounted on the lower end of the second terminal (250). The first electrode (270) and the second electrode (280) can slide closer to each other or move further apart.

3. The online insulating oil breakdown voltage tester according to claim 2, characterized in that, The lower end of the first terminal (230) is provided with a first insertion hole (231), one end of the first electrode (270) is slidably inserted into the first insertion hole (231), and a first locking bolt (240) is screwed onto the side wall of the first insertion hole (231), the first locking bolt (240) abutting against one end of the first electrode (270).

4. The online insulating oil breakdown voltage tester according to claim 2, characterized in that, The lower end of the second terminal (250) is provided with a second insertion hole, one end of the second electrode (280) is slidably inserted into the second insertion hole, and a second locking bolt (260) is screwed onto the side wall of the second insertion hole, the second locking bolt (260) abutting against one end of the second electrode (280).

5. The online insulating oil breakdown voltage tester according to claim 1, characterized in that, The oil cup (210) is provided with at least two positioning posts (212) at the upper end, and the cup cover (220) is provided with at least two positioning grooves (221). All the positioning posts (212) are embedded in all the positioning grooves (221) in a corresponding manner, so that the cup cover (220) can be detachably fixed to the oil cup (210).

6. The online insulating oil breakdown voltage tester according to claim 5, characterized in that, A sealing structure is provided between the cup lid (220) and the oil cup (210).

7. The online insulating oil breakdown voltage tester according to claim 1, characterized in that, It also includes a pumping device (300). The oil cup (210) is provided with an oil inlet pipe (213) and an oil outlet pipe (214). The oil inlet pipe (213) and the oil outlet pipe (214) are both connected to the oil chamber (211). A first control valve (620) is provided on the oil outlet pipe (214). The first control valve (620) is used to control the opening and closing of the oil outlet pipe (214). The pumping device (300) is used to drive the insulating oil from the oil inlet pipe (213) into the oil chamber (211). The first control valve (620) and the pumping device (300) are both electrically connected to the control system (110).

8. The online insulating oil breakdown voltage tester according to claim 7, characterized in that, The pumping device (300) is configured as a vacuum pump, which is connected to the oil chamber (211). The oil inlet pipe (213) is equipped with a second control valve (630). The oil cup (210) is equipped with a level switch (610) for detecting the liquid level in the oil chamber (211). The second control valve (630) is electrically interlocked with the level switch (610).

9. The online insulating oil breakdown voltage tester according to claim 1, characterized in that, The oil cup (210) is provided with a heating device (400) for heating the insulating oil in the oil chamber (211), and the heating device (400) is electrically connected to the control system (110).

10. An online insulating oil breakdown voltage tester according to claim 1, characterized in that, The oil cup (210) is provided with a stirring device (500) for stirring the insulating oil in the oil chamber (211), and the stirring device (500) is electrically connected to the control system (110).

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