On-site detection device for breakdown voltage of transformer insulating oil

Abstract

The utility model belongs to the technical field of transformer insulating oil detection, and particularly relates to a transformer insulating oil breakdown voltage field detection device which comprises a detection box and supporting legs, and a detection device and a filtering device are arranged in the detection box. According to the field detection device for the breakdown voltage of the transformer insulating oil, the oil temperature of the insulating oil is detected through the temperature sensor, and when the oil temperature is too low, the electric heating wire in the electric heating box is started to heat the insulating oil in the oil conveying pipe, so that the situation that the detection result is influenced due to the unstable oil temperature is avoided; a large number of solid impurity particles such as iron particles, copper particles, carbon particles and fiber particles can be generated in transformer oil due to mechanical vibration, partial discharge and the aging effect of oil paper insulation in the operation process of the transformer, so that after detection is completed, the insulating oil is conveyed into the filter box through the oil discharge pipe, and then the transformer oil is filtered. And solid particles in the insulating oil are intercepted and filtered through the filter screen, so that the service life of the insulating oil is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer insulating oil detection, in particular to a transformer insulating oil breakdown voltage on-site detection device. Background Art

[0002] At the construction site of the power supply line, electrical equipment such as oil transformers of different grades, oil switches of different grades, oil reactors of different grades are installed. The insulating oil in these equipment needs to be tested regularly to verify its insulation performance.

[0003] For example, Chinese patent announcement No. CN209979288U discloses a transformer insulating oil breakdown voltage on-site detection and extraction device. When in use, first turn on the water pump. At this time, the insulating oil in the transformer flows into the equipment body from the second tube body, and flows back to the transformer from the first tube body through the connecting pipe. Since the second tube body is the liquid inlet end of the insulating oil and the heat dissipation of the grease is slow, the temperature in the second tube body is closest to the insulating oil temperature in the transformer. A temperature sensing element is provided in the second tube body to detect the temperature of the insulating oil in the transformer and output a preset value signal. Since the connecting tube is completely located in the cavity, the detection electrode A and the detection electrode B are placed in the connecting tube, and the detection signal is output. The detection signal is compared with the preset value signal in the comparison module. If the detection signal value is lower than the preset value, the comparator is turned on to make the control module and the execution module start working. At this time, the heating component heats the equipment body, otherwise it does not heat; at the same time, the telescopic component can raise or lower the equipment body as needed.

[0004] However, the transformer insulating oil breakdown voltage on-site detection and extraction device in the above application will produce a large amount of solid impurity particles, such as iron particles, copper particles, carbon particles and fiber particles, in the transformer oil due to mechanical vibration, partial discharge and aging of oil-paper insulation during transformer operation. In severe cases, the impurity particles will form a small impurity bridge that penetrates the high-voltage and low-voltage ends inside the transformer, causing a short-circuit fault in the transformer. The above device does not have a corresponding processing mechanism after detection, so it has certain limitations.

[0005] For this reason, we urgently need to provide a field detection device for the breakdown voltage of transformer insulating oil. Utility Model Content

[0006] The utility model aims to provide a transformer insulating oil breakdown voltage on-site detection device to solve the transformer insulating oil breakdown voltage on-site detection extraction device proposed in the above-mentioned background technology. Due to mechanical vibration, partial discharge and aging of oil-paper insulation during the operation of the transformer, a large number of solid impurity particles, such as iron particles, copper particles, carbon particles and fiber particles, will be generated in the transformer oil. In severe cases, the impurity particles will form an impurity bridge that penetrates the high-voltage end and the low-voltage end inside the transformer, causing a short-circuit fault of the transformer, and the above-mentioned device has no corresponding processing mechanism after detection.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a transformer insulating oil breakdown voltage on-site detection device, comprising a detection box and supporting feet, wherein the four supporting feet are respectively fixedly connected to the four corners of the lower surface of the detection box, and a detection device and a filtering device are arranged inside the detection box.

[0008] The detection device comprises a pumping unit and a heating unit.

[0009] The pumping unit includes a water pump, an oil inlet pipe, an oil delivery pipe, a connecting pipe, a detection pipe, and a discharge electrode sheet. The water pump is installed on the right side inside the detection box. The oil inlet pipe is fixedly connected to the water suction port of the water pump, and the other end thereof extends to the outside of the detection box. The oil delivery pipe is fixedly connected to the water outlet of the water pump, the connecting pipe is fixedly connected to the left end of the oil delivery pipe, and the detection pipe is fixedly connected to the top of the connecting pipe. Two discharge electrode sheets are respectively installed at the center of the front and rear surfaces of the detection tube. The oil inlet pipe is connected to the transformer oil tank, and then the water pump is started to pump the insulating oil into the inside of the oil delivery pipe through the oil inlet pipe, and then flow to the inside of the connecting pipe, and finally enter the detection tube. Then the discharge electrode sheet is energized to perform voltage breakdown detection on the insulating oil inside the detection tube.

[0010] A further improvement is that the heating unit includes an electric heating box, an electric heating wire, and a temperature sensor. The electric heating box is installed on the outside of the oil pipeline, the electric heating wire is installed on the inside of the electric heating box, and the temperature sensor is installed in the middle of the oil pipeline. The temperature of the insulating oil is detected by the temperature sensor. When the oil temperature is too low, the electric heating wire inside the electric heating box is started to heat the insulating oil inside the oil pipeline, thereby avoiding the situation where the detection result is affected by unstable oil temperature.

[0011] A further improvement is that a viscosity sensor is installed on the left side of the oil pipeline, and the viscosity of the insulating oil is recorded by the viscosity sensor.

[0012] A further improvement is that the filtering device includes an oil drain pipe, a filter box, a filter screen, a sealing top cover, a pull ring, and a return pipe. The oil drain pipe is fixedly connected to the right side of the detection tube, the filter box is fixedly connected to the right side of the oil drain pipe, the filter screen is installed inside the filter box, the sealing top cover is fixedly connected to the top of the filter screen, the pull ring is fixedly connected to the top center of the sealing top cover, and the return pipe is fixedly connected to the right side of the filter box, and its right end extends to the outside of the detection box. Mechanical vibration, partial discharge and aging of oil-paper insulation during the operation of the transformer will produce a large amount of solid impurity particles in the transformer oil, such as iron particles, copper particles, carbon particles and fiber particles. Therefore, after the detection is completed, the insulating oil is transmitted to the inside of the filter box through the oil drain pipe, and the solid particles inside the insulating oil are intercepted and filtered through the filter screen, thereby increasing the service life of the insulating oil.

[0013] A further improvement is that a slide groove is provided on the top of the filter box, the filter screen is slidably connected to the inside of the slide groove, and sealing valves are respectively installed on the outer surfaces of the oil inlet pipe and the return pipe. After filtering the insulating oil, the pull ring is pulled to remove the filter screen from the slide groove provided on the top of the filter box, thereby cleaning the filter screen. The setting of the sealing valve maintains the sealing performance of the device in a normal state to prevent dust from entering.

[0014] A further improvement is that a sealed box door is installed on the front of the detection box, a handle is fixedly connected to the top of the detection box, a battery is installed at the rear end of the detection box, and a controller is installed at the front end of the detection box. The device can be carried and moved by lifting the handle, which is more convenient to use.

[0015] A further improvement is that the detection device is electrically connected to a controller, and the controller is electrically connected to a battery. The controller is used to record the viscosity of the insulating oil, control the oil temperature of the insulating oil, and detect the insulating oil, and the battery is used to power the device.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The transformer insulating oil breakdown voltage on-site detection device connects the oil inlet pipe to the transformer oil tank, then starts the water pump to pump the insulating oil into the oil pipeline through the oil inlet pipe, and then flows into the connecting pipe, and finally enters the detection tube, and then energizes the discharge electrode sheet to perform voltage breakdown detection on the insulating oil inside the detection tube.

[0018] 2. The transformer insulating oil breakdown voltage on-site detection device detects the oil temperature of the insulating oil through a temperature sensor. When the oil temperature is too low, the electric heating wire inside the electric heating box is started to heat the insulating oil inside the oil pipeline, thereby avoiding the situation where the unstable oil temperature affects the detection result.

[0019] 3. The transformer insulating oil breakdown voltage on-site detection device, the mechanical vibration, partial discharge and aging of oil-paper insulation during the operation of the transformer will produce a large number of solid impurity particles in the transformer oil, such as iron particles, copper particles, carbon particles and fiber particles. Therefore, after the detection is completed, the insulating oil is transmitted to the inside of the filter box through the oil drain pipe, and the solid particles inside the insulating oil are intercepted and filtered through the filter, thereby increasing the service life of the insulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view structural schematic diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the detection box of the utility model;

[0022] Figure 3 For the utility model Figure 2 Schematic diagram of the split structure at A in the middle;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the heating unit of the present utility model.

[0024] In the figure: 1. detection box; 2. support foot; 301. water pump; 302. oil inlet pipe; 303. oil delivery pipe; 304. connecting pipe; 305. detection tube; 306. discharge electrode sheet; 307. electric heating box; 308. electric heating wire; 309. temperature sensor; 310. viscosity sensor; 401. oil drain pipe; 402. filter box; 403. filter screen; 404. sealed top cover; 405. pull ring; 406. return pipe; 407. sealing valve; 501. sealed box door; 502. handle; 503. battery; 504. controller. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-Figure 4 , the utility model provides a technical solution:

[0027] Embodiment 1:

[0028] A transformer insulating oil breakdown voltage on-site detection device comprises a detection box 1 and support legs 2. Four support legs 2 are respectively fixedly connected to four corners of the lower surface of the detection box 1. A detection device and a filtering device are arranged inside the detection box 1.

[0029] The detection device comprises a pumping unit.

[0030] The pumping unit includes a water pump 301, an oil inlet pipe 302, an oil delivery pipe 303, a connecting pipe 304, a detection pipe 305, and a discharge electrode sheet 306. The water pump 301 is installed on the right side of the detection box 1. The oil inlet pipe 302 is fixedly connected to the water inlet of the water pump 301, and the other end thereof extends to the outside of the detection box 1. The oil delivery pipe 303 is fixedly connected to the water outlet of the water pump 301. The connecting pipe 304 is fixedly connected to the left end of the oil delivery pipe 303. The detection pipe 305 is fixedly connected to the discharge electrode sheet 306. At the top of the connecting pipe 304, two discharge electrode sheets 306 are respectively installed at the center of the front and rear surfaces of the detection tube 305, and the oil inlet pipe 302 is connected to the transformer oil tank. Then, the water pump 301 is started to pump the insulating oil to the inside of the oil pipeline 303 through the oil inlet pipe 302, and then flow to the inside of the connecting pipe 304, and finally enter the detection tube 305. Then, the discharge electrode sheets 306 are energized to perform voltage breakdown detection on the insulating oil inside the detection tube 305.

[0031] A viscosity sensor 310 is installed on the left side of the oil delivery pipe 303 , and the viscosity of the insulating oil is recorded by the viscosity sensor 310 .

[0032] The filtering device includes an oil drain pipe 401, a filter box 402, a filter screen 403, a sealing top cover 404, a pull ring 405, and a return pipe 406. The oil drain pipe 401 is fixedly connected to the right side of the detection tube 305, the filter box 402 is fixedly connected to the right side of the oil drain pipe 401, the filter screen 403 is installed inside the filter box 402, the sealing top cover 404 is fixedly connected to the top of the filter screen 403, the pull ring 405 is fixedly connected to the top center of the sealing top cover 404, and the return pipe 406 is fixedly connected to the right side of the filter box 402, and its right end extends to the outside of the detection box 1. Mechanical vibration, partial discharge and aging of oil-paper insulation during the operation of the transformer will produce a large amount of solid impurity particles in the transformer oil, such as iron particles, copper particles, carbon particles and fiber particles. Therefore, after the detection is completed, the insulating oil is transmitted to the inside of the filter box 402 through the oil drain pipe 401, and the solid particles inside the insulating oil are intercepted and filtered through the filter screen 403, thereby increasing the service life of the insulating oil.

[0033] A slide groove is provided on the top of the filter box 402, and the filter screen 403 is slidably connected to the inside of the slide groove. Sealing valves 407 are respectively installed on the outer surfaces of the oil inlet pipe 302 and the return pipe 406. After filtering the insulating oil, pull the pull ring 405 to take out the filter screen 403 from the slide groove provided on the top of the filter box 402, so as to clean the filter screen 403. The setting of the sealing valve 407 maintains the sealing performance of the device in a normal state to prevent dust from entering.

[0034] A sealed box door 501 is installed on the front of the detection box 1, a handle 502 is fixedly connected to the top of the detection box 1, a battery 503 is installed at the rear end of the detection box 1, and a controller 504 is installed at the front end of the detection box 1. The device can be carried and transferred by lifting the handle 502, which is more convenient to use.

[0035] The detection device is electrically connected to the controller 504, and the controller 504 is electrically connected to the battery 503. The controller 504 is used to record the viscosity of the insulating oil, control the oil temperature of the insulating oil, and detect the insulating oil. The battery 503 is used to power the device.

[0036] Embodiment 2:

[0037] On the basis of Example 1, the detection device also includes a heating unit, which includes an electric heating box 307, an electric heating wire 308, and a temperature sensor 309. The electric heating box 307 is installed on the outside of the oil pipeline 303, the electric heating wire 308 is installed on the inside of the electric heating box 307, and the temperature sensor 309 is installed in the middle of the inside of the oil pipeline 303.

[0038] The temperature of the insulating oil is detected by the temperature sensor 309. When the oil temperature is too low, the electric heating wire 308 inside the electric heating box 307 is started to heat the insulating oil inside the oil pipe 303, thereby avoiding the situation where the detection result is affected by the unstable oil temperature.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants 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 other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A transformer insulating oil breakdown voltage on-site detection device, comprising a detection box (1) and support legs (2), wherein four support legs (2) are respectively fixedly connected to four corners of the lower surface of the detection box (1), characterized in that: The detection box (1) is provided with a detection device and a filtering device inside; The detection device comprises a pumping unit and a heating unit; The pumping unit comprises a water pump (301), an oil inlet pipe (302), an oil delivery pipe (303), a connecting pipe (304), a detection pipe (305), and a discharge electrode sheet (306). The water pump (301) is installed on the right side of the detection box (1). The oil inlet pipe (302) is fixedly connected to the water suction port of the water pump (301), and the other end thereof extends to the outside of the detection box (1). The oil delivery pipe (303) is fixedly connected to the water outlet of the water pump (301). The connecting pipe (304) is fixedly connected to the left end of the oil delivery pipe (303). The detection pipe (305) is fixedly connected to the top end of the connecting pipe (304). Two discharge electrode sheets (306) are respectively installed at the center of the front and rear surfaces of the detection pipe (305).

2. A transformer insulating oil breakdown voltage on-site detection device according to claim 1, characterized in that: The heating unit comprises an electric heating box (307), an electric heating wire (308), and a temperature sensor (309); the electric heating box (307) is installed on the outside of the oil pipeline (303); the electric heating wire (308) is installed on the inside of the electric heating box (307); and the temperature sensor (309) is installed in the middle of the oil pipeline (303).

3. A transformer insulating oil breakdown voltage on-site detection device according to claim 2, characterized in that: A viscosity sensor (310) is installed on the left side of the oil delivery pipe (303).

4. A transformer insulating oil breakdown voltage on-site detection device according to claim 3, characterized in that: The filtering device comprises an oil drain pipe (401), a filter box (402), a filter screen (403), a sealing top cover (404), a pull ring (405), and a return pipe (406); the oil drain pipe (401) is fixedly connected to the right side of the detection tube (305); the filter box (402) is fixedly connected to the right side of the oil drain pipe (401); the filter screen (403) is installed inside the filter box (402); the sealing top cover (404) is fixedly connected to the top of the filter screen (403); the pull ring (405) is fixedly connected to the top center of the sealing top cover (404); the return pipe (406) is fixedly connected to the right side of the filter box (402), and the right end of the return pipe (406) extends to the outside of the detection box (1).

5. A transformer insulating oil breakdown voltage on-site detection device according to claim 4, characterized in that: A slide groove is provided on the top of the filter box (402), and the filter screen (403) is slidably connected to the inside of the slide groove. Sealing valves (407) are respectively installed on the outer surfaces of the oil inlet pipe (302) and the return pipe (406).

6. A transformer insulating oil breakdown voltage on-site detection device according to claim 5, characterized in that: The front of the detection box (1) is provided with a sealed box door (501), the top of the detection box (1) is fixedly connected with a handle (502), the rear end of the detection box (1) is provided with a storage battery (503), and the front end of the detection box (1) is provided with a controller (504).

7. A transformer insulating oil breakdown voltage on-site detection device according to claim 6, characterized in that: The detection device is electrically connected to a controller (504), and the controller (504) is electrically connected to a storage battery (503).

Images