Electric power test device for electric power maintenance

Abstract

The invention discloses an electric power test device for electric power maintenance, which comprises a support frame for detecting oil liquid in a wet-type transformer, and a light-transmitting circuit for measuring the turbidity of the oil liquid and a power supply module for providing electric power for the light-transmitting circuit are arranged on the support frame. An oil measuring structure used for measuring the depth of oil and sampling the oil is further arranged on the supporting armature, the oil measuring structure and a vertical base fixed to the supporting armature through bolts are arranged on the oil measuring structure, a depth plate is arranged on the vertical base, and a boundary position assembly used for driving the light-transmitting circuit and the relapse assembly to operate after the bottom extending U-shaped frame goes deep into an oil liquid level line is arranged on the vertical base. By arranging the oil detection structure, the turbidity of oil at different depths can be accurately detected, oil sampling at different depths can be carried out at the same time, the stratified sampling mode can avoid errors possibly caused by single-depth sampling, the conditions of the oil at different depths can be comprehensively analyzed, and the accuracy and comprehensiveness of detection are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric power maintenance equipment, in particular to an electric power test device used for electric power maintenance. Background Art

[0002] The transformer is a key equipment in the power system, and its operating status directly affects the stability and safety of the entire power system. Transformer oil plays an important role in insulation and cooling in the transformer. Therefore, monitoring the status of transformer oil is an important part of transformer maintenance. When a transformer fails, quickly and accurately detecting the oil height, color change, and gas composition is of great significance for fault diagnosis and repair.

[0003] Chinese patent (publication number: CN114980603B), its scheme includes a test frame, the side of the top of the test frame is provided with a hinge, the top of the test frame is movably connected to a top cover through the hinge, the side of the test frame close to the inside is fixedly connected to a fixed limit strip, the side of the test frame close to the outside is movably connected to a movable limit strip, and the side of the movable limit strip is fixedly connected to a movable block. The present invention is conducive to realizing efficient fixing operation of power equipment by providing a test frame, a hinge, a top cover, a fixed limit strip, a movable limit strip, a movable block, a movable groove, a first screw and a second screw. In actual use, the staff first puts the power equipment that needs to be repaired from the top of the test frame into the interior of the test frame, and then twists the second screw first, so that the movable block can slide stably inside the movable groove.

[0004] The power test equipment in the above patent is difficult to detect the transformer oil in the wet transformer during repair and maintenance. The existing transformer oil detection technology mainly relies on manual operation, which is not only time-consuming and labor-intensive, but also unable to reflect the status of the oil in real time.

[0005] At the same time, manual measurement is usually used to measure the oil height. Some transformer oil pillows are equipped with liquid level gauges. However, when the transformer is being repaired, the liquid level gauge may still need to be manually measured because it is in a power-off state. Therefore, when the transformer is being repaired, the manual measurement of the oil height is still relatively cumbersome.

[0006] Furthermore, when performing gas analysis on transformer oil, the prior art takes samples through a pipe at the oil pillow, and the sampling position of the oil is relatively single, which makes it difficult to reflect the overall phenomenon of the oil in the transformer.

[0007] Therefore, in order to solve the technical problem of testing transformer oil during maintenance, an electric power test device for electric power maintenance is proposed. Summary of the invention

[0008] The purpose of the present invention is to provide an electric test device for electric maintenance, which has the advantages of sampling oil at different depths and helping to accurately judge the degree of deterioration and contamination of the oil, thereby solving the problems of relatively single sampling position for the oil and the relatively cumbersome process of manually measuring the oil height.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: an electric power test device for electric power maintenance, comprising a support frame for detecting oil in a wet transformer, a light-transmitting circuit for measuring oil turbidity and a power supply module for providing power to the light-transmitting circuit are provided on the support frame, and an oil measuring structure for measuring oil depth and sampling oil is also provided on the support frame; The oil measuring structure is fixed to a vertical base with support bracket bolts, a depth plate that can move freely in the vertical direction is provided on the vertical base, and a longitudinal slide groove for the depth plate to slide is provided on the vertical base, and a bottom extension U-shaped frame is fixedly connected to the bottom of the vertical base; The light-transmitting circuit comprises a light-emitting diode and a photoresistor which are fixedly connected to the bottom extending U-shaped frame and arranged opposite to each other, and the light-emitting diode and the photoresistor are both electrically connected to the power module.

[0010] The support bracket is provided with a re-absorption component for sampling oil, and the vertical base is provided with an interface component for driving the light-transmitting circuit and the re-absorption component to operate after the bottom U-shaped frame penetrates into the oil level line.

[0011] Preferably, the light-transmitting circuit further comprises an operational amplifier electrically connected to the photoresistor and a microcontroller for receiving and processing signals, and both the operational amplifier and the microcontroller are electrically connected to the power module; The light-transmitting circuit also includes a display electrically connected to the microcontroller to display the result of processing the signal.

[0012] Preferably, the re-suction assembly comprises two sets of side plates fixedly connected to the vertical base, and a traverse rod freely moving in the horizontal direction is slidably penetrated between the two sets of side plates; The support bracket is bolted with a pumping cylinder, and a piston plate that is in sliding contact with the inner wall of the pumping cylinder is fixedly connected to the side of the traverse rod facing the pumping cylinder. The pumping cylinder is fixedly provided with an oil return pipe and an oil outlet pipe, and one end of the oil return pipe and the oil outlet pipe away from the pumping cylinder is fixedly connected to the bottom extension U-shaped frame and the support bracket respectively, and a sample tube is placed on the support bracket corresponding to the oil outlet pipe position.

[0013] Preferably, the vertical base is provided with a gear that rotates freely in the vertical direction, the gear is meshed with a back-facing rack, and the back-facing rack is fixedly connected to the depth plate; A positioning pin is slidably penetrated on the traverse rod, and a corrugated groove for the positioning pin to slide is provided on the depth plate.

[0014] Preferably, the position limiting assembly comprises a hollow trigger frame fixedly connected to a vertical base, the hollow trigger frame is provided with a transverse plate freely moving in a horizontal direction, two groups of blocking columns are arranged on the transverse plate for fixed axis rotation, and both groups of blocking columns include an integrally formed side convex portion; The hollow trigger frame is provided with a blocking circular groove for the blocking column to slide, the hollow trigger frame is fixedly connected to a limit pin on one side facing the blocking column, and the blocking column is provided with a spiral groove for the limit pin to slide; The positioning pin is fixedly connected with an I-shaped seat on one side facing the hollow trigger frame. The I-shaped seat is in abutment connection with the side convex portion. A positioning spring is sleeved on the outer circumference of the I-shaped seat. The two ends of the positioning spring are respectively fixedly connected to the I-shaped seat and the traverse rod.

[0015] Preferably, a connecting column which can freely move in the horizontal direction is provided in the hollow trigger frame, the connecting column is fixedly connected to the transverse plate, and one end of the connecting column away from the transverse plate includes an integrally formed end frame portion, and the end frame portion is provided with a plurality of groups of snap-fitting balls and a ball cavity for the snap-fitting balls to slide; The hollow trigger frame comprises an integrally formed inner step portion, the inner step portion is in abutting connection with the clamping ball, the outer ring of the connecting column is provided with a reset spring, and the two ends of the reset spring are respectively fixedly connected to the end frame portion and the hollow trigger frame.

[0016] Preferably, a movable copper sheet for connection to electricity is fixedly connected to the transverse plate, a positioning copper sheet for connection to electricity is fixedly connected to the hollow trigger frame at a position corresponding to the movable copper sheet for connection to electricity, and both the movable copper sheet for connection to electricity and the positioning copper sheet for connection to electricity are electrically connected to the light-emitting diode.

[0017] Preferably, the interface assembly further comprises a compressed air column fixedly connected to the depth plate, and a gas passage for sliding is provided at a position of the vertical base corresponding to the compressed air column, and the gas passage comprises an integrally formed closing portion; The hollow trigger frame is fixedly connected with an elastic sheet, and a closed inner chamber is formed between the elastic sheet and the hollow trigger frame. The inner chamber is fixedly connected with a plug pin that contacts the clamping ball at a position toward the end frame. The inner chamber is also fixedly connected with a pull pin, which radially penetrates the hollow trigger frame and is sleeved with a limit spring on the outer circumference, and the two ends of the limit spring are respectively fixedly connected to the elastic sheet and the hollow trigger frame; The inner chamber is in gas communication with the closing portion.

[0018] Preferably, the vertical base has a No. 1 pressure-compensating pipe and a No. 2 pressure-compensating pipe fixedly passing through the corresponding closing position, and the ends of the No. 1 pressure-compensating pipe and the No. 2 pressure-compensating pipe away from the vertical base are respectively fixed through the bottom U-shaped frame and the hollow trigger frame, and the No. 2 pressure-compensating pipe is in communication with the gas in the inner chamber.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The present invention can accurately detect the turbidity of oil at different depths through the light-emitting diode and photoresistor in the light-transmitting circuit, which helps to accurately judge the degree of deterioration and contamination of the oil. Since the color change of the oil is an early sign of internal faults (such as local overheating or discharge), the detection of the light-transmitting circuit can detect and prevent internal faults of the transformer at an early stage.

[0020] The present invention can perform oil sampling at different depths by providing a re-absorption component. This layered sampling method can avoid the errors that may be caused by single-depth sampling, help to comprehensively analyze the conditions of oil at different depths, and improve the accuracy and comprehensiveness of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the components where the support bracket of the present invention is located; Figure 3 It is a schematic diagram of the components where the traverse rod of the present invention is located; Figure 4 This is a schematic diagram of the components where the workpiece seat of the present invention is located; Figure 5 This is a schematic diagram of the components where the blocking column of the present invention is located; Figure 6 It is a schematic diagram of the components where the vertical base of the present invention is located; Figure 7 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 8 For the present invention Figure 4 Enlarged view of point B in the middle; Fig. 9 For the present invention Figure 6 Enlarged view of point C in the middle; Fig.10 The figure is a schematic diagram of the circuit where the photoresistor of the present invention is located.

[0022] In the figure: 1, support frame; 2, vertical base; 3, depth plate; 4, corrugated groove; 5, bottom extension U-shaped frame; 6, light emitting diode; 7, photoresistor; 8, side plate; 9, traverse rod; 10, positioning pin; 11, positioning spring; 12, I-shaped seat; 13, hollow trigger frame; 131, inner step; 14, blocking column; 141, side convex part; 15, blocking circular groove; 16, limit pin; 17, spiral groove; 18, traverse plate; 19, connecting column; 191, end frame; 2 0. Reset spring; 21. Snap-fit ​​ball; 22. Plug pin; 23. Elastic sheet; 24. Inner chamber; 25. Limit spring; 26. Pull pin; 27. Air passage; 271. Closing part; 28. Compressed air column; 29. ​​No. 1 pressure-supporting pipeline; 30. No. 2 pressure-supporting pipeline; 31. Movable electrical copper sheet; 32. Positioning electrical copper sheet; 33. Piston plate; 34. Pumping cylinder; 35. Oil return pipeline; 36. Oil outlet pipeline; 37. Sample tube; 38. Gear; 39. Back-facing rack. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figures 1 to 10 The present invention provides a technical solution: an electric power test device for electric power maintenance, comprising a support frame 1 for detecting oil in a wet transformer, a light-transmitting circuit for measuring oil turbidity and a power supply module for providing power to the light-transmitting circuit are provided on the support frame 1, and an oil measuring structure for measuring oil depth and sampling oil is also provided on the support frame 1; The oil measuring structure is fixed to a vertical base 2 with bolts on the support frame 1, and a depth plate 3 that can move freely in the vertical direction is provided on the vertical base 2, and a longitudinal slide groove for the depth plate 3 to slide is provided on the vertical base 2, and a bottom extension U-shaped frame 5 is fixedly connected to the bottom of the vertical base 2; The light-transmitting circuit includes a light-emitting diode 6 and a photoresistor 7 which are fixedly connected to the bottom extending U-shaped frame 5 and arranged opposite to each other. The light-emitting diode 6 and the photoresistor 7 are both electrically connected to the power module.

[0025] The support bracket 1 is provided with a re-absorption component for sampling oil, and the vertical base 2 is provided with an interface component for driving the light-transmitting circuit and the re-absorption component to operate after the bottom U-shaped frame 5 penetrates into the oil level line.

[0026] like Figure 1 and Figure 2As shown, when repairing a wet transformer, it is necessary to rule out the possibility that the oil inside it is the fault factor. At the same time, the oil can be sampled and the sampled oil can be subjected to gas analysis to determine whether the high-voltage coil or low-voltage coil inside it is faulty. In addition, during the maintenance process, the sampled oil can be subjected to insulation strength tests, moisture content tests, lightning tests and other experimental steps to determine the electrical properties, chemical stability and physical properties of the transformer oil.

[0027] At the same time, whether the oil height in the transformer is within the standard range is one of the factors that determine whether the wet transformer will fail. Therefore, during maintenance, the support bracket 1 is stably placed at the oil port position above the oil pillow, and the bottom U-shaped frame 5 is made to correspond to the oil port position, and ensure that the bottom U-shaped frame 5 can penetrate into the oil pillow during the lifting process.

[0028] When the bottom-extending U-shaped frame 5 gradually penetrates into the oil pillow, the light-emitting diode 6 and the photoresistor 7 thereon are driven to gradually approach the liquid level line of the oil and finally penetrate into the oil. After the bottom-extending U-shaped frame 5 penetrates into the oil, the light-transmitting circuit and the re-suction component are unlocked through the interface component, and then as the bottom-extending U-shaped frame 5 continues to penetrate deeper, the re-suction component reciprocates to suck the oil at different depths, thereby sampling the oil at different depths.

[0029] Furthermore, the light-transmitting circuit also includes an operational amplifier electrically connected to the photoresistor 7 and a microcontroller for receiving and processing signals. Both the operational amplifier and the microcontroller are electrically connected to the power module.

[0030] The light-transmitting circuit also includes a display electrically connected to the microcontroller to display the result of processing the signal.

[0031] like Figure 1 , Figure 6 and Fig.10 As shown, when the bottom U-shaped frame 5 penetrates below the oil level line, the circuit where the light-emitting diode 6 is located is unblocked under the drive of the interface component, wherein the power module provides electrical energy to the light-emitting diode 6, and the light-emitting diode 6 shines on the photoresistor 7. The circuit where the light-emitting diode 6 is located is electrically connected to a current-limiting resistor, and the current-limiting resistor is used to limit the current flowing through the light-emitting diode 6 to prevent the light-emitting diode 6 from being damaged.

[0032] At the same time, the power supply module is electrically connected to the photoresistor 7, and the photoresistor 7 is electrically connected to a fixed resistor. A voltage divider circuit is formed between the fixed resistor and the photoresistor 7 to generate a voltage output related to the light intensity, wherein the output voltage of the voltage divider circuit is related to the change in the resistance value of the photoresistor 7, and the signal output is connected to the input end of the operation method device.

[0033] The operational amplifier amplifies the signal voltage and improves the signal processing accuracy. Its power supply end is connected to the positive pole of the power module, its ground end is connected to the negative pole of the power module, and its output end is connected to the analog input end of the microcontroller. The microcontroller reads the analog signal from the operational amplifier and performs data processing. At the same time, the microcontroller is electrically connected to the display or communication module to display the signal result through the display or transmit the data to the terminal device.

[0034] The light-emitting diode 6 and the photoresistor 7 in the light-transmitting circuit can detect the turbidity of oil at different depths to help determine the degree of oil deterioration and contamination. Changes in oil color are often early signs of internal faults (such as local overheating or discharge). Through the detection of the light-transmitting circuit, it can be determined whether components such as the high-voltage coil or the low-voltage coil are faulty, thereby eliminating the cause of the fault during maintenance and performing preventive maintenance.

[0035] In one of the more preferred embodiments, the re-suction assembly comprises two sets of side plates 8 fixedly connected to the vertical base 2, and a traverse rod 9 freely moving in the horizontal direction is slidably penetrated between the two sets of side plates 8; The support frame 1 is bolted with a pumping cylinder 34, and the side of the traverse rod 9 facing the pumping cylinder 34 is fixedly connected with a piston plate 33 that is in sliding contact with the inner wall of the pumping cylinder 34; The pumping cylinder 34 is fixedly provided with an oil return pipe 35 and an oil outlet pipe 36 , and the ends of the oil return pipe 35 and the oil outlet pipe 36 away from the pumping cylinder 34 are respectively fixedly connected to the bottom extension U-shaped frame 5 and the support bracket 1 , and a sample tube 37 is placed on the support bracket 1 at the position corresponding to the oil outlet pipe 36 .

[0036] like Figure 1-Figure 3 As shown, when the depth plate 3 moves downward in the oil pillow, it drives the bottom U-shaped frame 5 thereon to move downward synchronously. When the bottom U-shaped frame 5 penetrates into the oil level line, the transverse rod 9 reciprocates in the horizontal direction, and then sucks the oil through the return oil pipe 35 and discharges the oil into the sample tube 37 through the oil outlet pipe 36, thereby sampling the oil.

[0037] At the same time, as the bottom extended U-shaped frame 5 continues to move downward, the height of the oil inlet end of the oil return pipe 35 is changed synchronously, so that when the traverse rod 9 and the piston plate 33 reciprocate in the horizontal direction to suck the oil, the oil at different depths can be sampled to avoid the single sampling and facilitate a comprehensive analysis of the oil condition. When the transformer is repaired, the sampled oil sample is subjected to dissolved gas analysis to detect gas components such as hydrogen, methane, and acetylene in the oil, so as to determine whether there are discharge, overheating and other faults inside the transformer.

[0038] It should be noted that a group of one-way valves with opposite valve ports are respectively provided on the oil outlet pipeline 36 and the oil return pipeline 35. Through the setting of the two groups of one-way valves, the oil can only enter the oil pump 34 through the oil return pipeline 35, and be discharged into the sample tube 37 through the oil pump 34 and the oil outlet pipeline 36. Among them, a groove body for placing the sample tube 37 is provided on the support bracket 1 to prevent the sample tube 37 from overturning.

[0039] Furthermore, the vertical base 2 is provided with a gear 38 that can rotate freely in the vertical direction, the gear 38 is meshed with a back-facing rack 39, and the back-facing rack 39 is fixedly connected to the depth plate 3, a positioning pin 10 is slidably penetrated on the transverse rod 9, and a corrugated groove 4 is opened on the depth plate 3 for the positioning pin 10 to slide.

[0040] like Figure 1-Figure 3 As shown, the motor fixedly mounted on the vertical base 2 drives the gear 38 to rotate freely in the vertical direction, thereby driving the back rack 39 meshing with the gear 38 to rise and fall, wherein the back rack 39 is fixedly mounted on the depth plate 3, thereby driving the depth plate 3 and the bottom extending U-shaped frame 5 at its end to gradually rise into the oil pillow.

[0041] At the same time, when the bottom U-shaped frame 5 is not immersed in the oil, the positioning pin 10 does not contact the depth plate 3. At this time, the depth plate 3 will not drive the lateral rod 9 to move in the horizontal direction when it moves downward. Among them, when the bottom U-shaped frame 5 is immersed in the oil level line, under the drive of the boundary component, as the bottom U-shaped frame 5 continues to be immersed in the oil, the positioning pin 10 enters the corrugated groove 4. At this time, through the continued downward movement of the depth plate 3, the positioning pin 10 and the piston plate 33 fixed at its end can be driven to reciprocate in the horizontal direction through the corrugated groove 4 and the positioning pin 10, thereby driving the re-suction component to operate to sample oil at different depths.

[0042] Based on the embodiment of the re-absorption assembly, the position-limiting assembly includes a hollow trigger frame 13 fixedly connected to the vertical base 2, and a horizontally freely movable transverse plate 18 is provided on the hollow trigger frame 13, and two groups of blocking columns 14 are fixedly rotated on the transverse plate 18, and both groups of blocking columns 14 include an integrally formed side convex portion 141; The hollow trigger frame 13 is provided with a blocking circular groove 15 for the blocking column 14 to slide, and a limiting pin 16 is fixedly connected to the hollow trigger frame 13 on the side facing the blocking column 14, and the blocking column 14 is provided with a spiral groove 17 for the limiting pin 16 to slide; The positioning pin 10 is fixedly connected with an I-shaped seat 12 on one side facing the hollow trigger frame 13 , and the I-shaped seat 12 is in abutment connection with the side protrusion 141 . A positioning spring 11 is sleeved on the outer circumference of the I-shaped seat 12 , and the two ends of the positioning spring 11 are fixedly connected to the I-shaped seat 12 and the traverse rod 9 , respectively.

[0043] The hollow trigger frame 13 is provided with a connecting column 19 that can move freely in the horizontal direction. The connecting column 19 is fixedly connected to the transverse plate 18. The end of the connecting column 19 away from the transverse plate 18 includes an integrally formed end frame portion 191. The end frame portion 191 is provided with multiple groups of snap-in balls 21 and a ball cavity for the snap-in balls 21 to slide. The hollow trigger frame 13 includes an integrally formed inner step portion 131. The inner step portion 131 is in contact with the snap-in balls 21. A reset spring 20 is sleeved on the outer ring of the connecting column 19. The two ends of the reset spring 20 are respectively fixedly connected to the end frame portion 191 and the hollow trigger frame 13.

[0044] The transverse plate 18 is fixedly connected with a movable copper sheet 31 , and the hollow trigger frame 13 is fixedly connected with a positioning copper sheet 32 ​​corresponding to the position of the movable copper sheet 31 . Both the movable copper sheet 31 and the positioning copper sheet 32 ​​are electrically connected to the light emitting diode 6 .

[0045] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, in the initial state, the return spring 20 is in an extended deformation state. When the bottom U-shaped frame 5 is immersed in the oil, the engaging ball 21 is not restricted. At this time, the return spring 20 restores its elastic deformation and drives the connecting column 19 and the transverse plate 18 to move in the horizontal direction.

[0046] At the same time, at least two groups of blocking columns 14 are provided on the transverse plate 18, and the multiple groups of blocking columns 14 are all rotated on the transverse plate 18 with fixed axes. When the transverse plate 18 moves in the horizontal direction, it drives the multiple groups of blocking columns 14 to move synchronously. Among them, a limit pin 16 is fixedly provided on the hollow trigger frame 13, and the limit pin 16 is slidably connected to the blocking column 14 through a spiral groove 17. Therefore, as the blocking column 14 follows the horizontal movement of the transverse plate 18, under the restriction of the limit pin 16, the blocking column 14 can synchronously rotate a certain angle in the vertical direction.

[0047] At the same time, in the initial state, the positioning spring 11 is also in an elongated deformation state, and the side protrusion 141 integrally formed on the blocking column 14 is in abutment with the I-shaped seat 12. Through multiple groups of blocking columns 14, the positioning spring 11 is prevented from recovering its deformation. When the blocking column 14 rotates a certain angle in the vertical direction, the position of the upper side protrusion 141 can be changed. After the multiple groups of side protrusions 141 deviate from the position of the I-shaped seat 12, driven by the elastic potential energy of the positioning spring 11, the positioning pin 10 moves toward the depth plate 3.

[0048] It should be noted that the depth plate 3 continues to move in the vertical direction. When the I-shaped seat 12 is not restricted by the side protrusion 141, the positioning spring 11 restores its deformation and drives the positioning pin 10 to be connected with the depth plate 3. At this time, the positioning pin 10 may not directly enter the corrugated groove 4, but as the depth plate 3 drives the corrugated groove 4 to continue to move, the positioning pin 10 will enter the corrugated groove 4, and then the continuous descent of the depth plate 3 will drive the positioning pin 10 and the transverse rod 9 to move in the horizontal direction, thereby driving the re-suction assembly to operate.

[0049] It should be noted that when the connecting column 19 drives the transverse plate 18 to move in the horizontal direction, the distance between the movable copper sheet 31 and the positioning copper sheet 32 ​​is gradually reduced until the movable copper sheet 31 and the positioning copper sheet 32 ​​are in contact with each other. At the same time, when the two are in contact, the circuit where the light-emitting diode 6 is located is unblocked, and the light-emitting diode 6 can be driven to be in a working state, so that the illumination light emitted by the light-emitting diode 6 can be irradiated onto the photoresistor 7.

[0050] Subsequently, after the bottom extended U-shaped frame 5 penetrates deep into the oil, the oil at different depths can be tested through the light-transmitting component, thereby helping to determine the degree of deterioration and contamination of the oil, and then determining whether components such as the high-voltage coil or the low-voltage coil are faulty, thereby eliminating the cause of the fault during maintenance and performing preventive maintenance.

[0051] Furthermore, the said interface assembly also includes a compressed air column 28 fixedly connected to the depth plate 3, and the vertical base 2 is provided with a gas passage 27 for sliding at a position corresponding to the compressed air column 28, and the gas passage 27 includes an integrally formed closing portion 271; The hollow trigger frame 13 is fixedly connected with an elastic sheet 23, and a sealed inner chamber 24 is formed between the elastic sheet 23 and the hollow trigger frame 13. The inner chamber 24 is fixedly connected with a plug pin 22 that contacts and connects with the clamping ball 21 toward the end frame portion 191; The inner chamber 24 is also fixedly connected to a pull pin 26 , which radially penetrates the hollow trigger frame 13 and is sleeved with a limit spring 25 on the outer circumference. The two ends of the limit spring 25 are respectively fixedly connected to the elastic sheet 23 and the hollow trigger frame 13 . The inner chamber 24 is in gas communication with the closing portion 271 .

[0052] The vertical base 2 has a No. 1 pressure-compensating pipe 29 and a No. 2 pressure-compensating pipe 30 fixedly connected at the corresponding closing portion 271 , and the ends of the No. 1 pressure-compensating pipe 29 and the No. 2 pressure-compensating pipe 30 away from the vertical base 2 are fixedly connected to the bottom extending U-shaped frame 5 and the hollow trigger frame 13 , respectively, and the No. 2 pressure-compensating pipe 30 is in gas communication with the inner chamber 24 .

[0053] like Figure 2 , Figure 3 , Figure 6, Figure 7 and Fig. 9 As shown, when the depth plate 3 moves downward in the oil pillow, it drives the compressed air column 28 fixed thereon to move in the air passage 27, thereby pushing the gas in the air passage 27 and causing the gas in the air passage 27 to be discharged from the air passage 27, wherein the air passage 27 includes an integrally formed closing portion 271, and the gas flow cross-sectional size at the closing portion 271 is smaller than the gas flow cross-sectional size at the air passage 27. When the gas flows at the closing portion 271, according to the Venturi effect, the Venturi effect is expressed as follows: when the fluid passes through the tightened channel, the flow velocity will increase, and its size is inversely proportional to the cross-sectional size of the tightening portion. Therefore, when the gas passes through the closing portion 271, the flow velocity at the closing portion 271 will increase, and under the Bernoulli effect, low pressure will be generated near the highly flowing fluid. Therefore, low pressure is generated at the closing portion 271, thereby causing both the No. 1 pressure-compensating pipeline 29 and the No. 2 pressure-compensating pipeline 30 to generate negative pressure suction.

[0054] At the same time, the closing portion 271 is connected with the No. 1 pressure-boosting pipe 29 and the No. 2 pressure-boosting pipe 30, wherein the No. 1 pressure-boosting pipe 29 is fixedly arranged on the bottom extending U-shaped frame 5. When the bottom extending U-shaped frame 5 is not in contact with the oil, the low pressure phenomenon at the closing portion 271 can be alleviated through the No. 1 pressure-boosting pipe 29. However, as the bottom extending U-shaped frame 5 gradually descends, the end of the No. 1 pressure-boosting pipe 29 away from the closing portion 271 is immersed in the oil. At this time, the No. 1 pressure-boosting pipe 29 is blocked by the oil, and the negative pressure suction at the No. 1 pressure-boosting pipe 29 is hindered by the oil, making it difficult to alleviate the negative pressure phenomenon at the closing portion 271.

[0055] Therefore, after the No. 1 pressure-compensating pipe 29 is immersed in oil, the low pressure phenomenon at the closing portion 271 can only be alleviated through the No. 2 pressure-compensating pipe 30, thereby driving the gas in the inner chamber 24 to be discharged under the negative pressure phenomenon at the closing portion 271, thereby causing a negative pressure phenomenon in the inner chamber 24, and driving the elastic sheet 23 to deform under the negative pressure phenomenon, so as to drive the plug pin 22 to detach from the end frame portion 191.

[0056] At the same time, when the plug pin 22 is inserted into the position of the end frame portion 191, the plug pin 22 can squeeze multiple groups of snap-in balls 21, causing the multiple groups of snap-in balls 21 to be exposed outside the end frame portion 191 and to be pressed and contacted with the position of the inner step portion 131, thereby limiting the return spring 20 from restoring its elastic deformation. However, as the elastic sheet 23 deforms, the plug pin 22 moves away from the position of the end frame portion 191, and then under the elastic potential energy of the return spring 20, the snap-in ball 21 enters into the ball cavity, and then the return spring 20 restores its deformation to drive the connecting column 19 and the transverse plate 18 to move horizontally.

[0057] It should be noted that after the oil test in a single transformer is carried out, the positioning pin 10 is pushed so that the I-shaped seat 12 is located between the multiple groups of blocking columns 14, and the blocking columns 14 are pushed to drive the engaging ball 21 on the end frame portion 191 to be located at the inner step portion 131. At this time, the reset spring 20 and the positioning spring 11 are in an extended state again, and when the connecting column 19 moves toward the direction of the plug pin 22, the multiple groups of blocking columns 14 rotate so that the side protrusions 141 restrict the I-shaped seat 12 again, so that the positioning pin 10 is disengaged from the depth plate 3 and the corrugated groove 4.

[0058] At the same time, when the end frame portion 191 moves toward the direction of the plug pin 22, the plug pin 22 is gradually inserted into the end frame portion 191, and under the action of the plug pin 22, multiple groups of snap-fitting balls 21 gradually move away from the center line of the end frame portion 191, so that the snap-fitting balls 21 are again in conflict with the position of the inner step portion 131, and under the obstruction of the plug pin 22 to the snap-fitting balls 21, the return spring 20 is again restricted from recovering its deformation.

[0059] In actual use, after the bottom U-shaped frame 5 penetrates into the oil, the light-transmitting circuit runs, and the display in the light-transmitting circuit displays the test results in real time. Therefore, when the depth plate 3 moves downward until the line where the light-emitting diode 6 is located is unblocked and continues to descend, after the No. 1 pressure-compensating pipe 29 is immersed in the oil, the light-emitting diode 6 emits a light source. At this time, the resistance value of the photoresistor 7 has a peak value, and the display displays the received signal in real time. By calculating and judging the peak value, the height of the oil to the oil port position can be known, and then the depth of the oil in the oil pillow can be known.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric power test device for electric power maintenance, comprising a support frame (1) for detecting oil in a wet transformer, characterized in that: The support bracket (1) is provided with a light-transmitting circuit for measuring the turbidity of the oil and a power module for providing power to the light-transmitting circuit. The support bracket (1) is also provided with an oil measuring structure for measuring the depth of the oil and sampling the oil. The oil measuring structure is bolted to a vertical base (2) of the support frame (1); a depth plate (3) that can move freely in the vertical direction is provided on the vertical base (2); a longitudinal slide groove for the depth plate (3) to slide is provided on the vertical base (2); and a bottom extension U-shaped frame (5) is fixedly connected to the bottom of the vertical base (2); The light-transmitting circuit comprises a light-emitting diode (6) and a photoresistor (7) which are fixedly connected to the bottom extending U-shaped frame (5) and arranged opposite to each other, and the light-emitting diode (6) and the photoresistor (7) are both electrically connected to the power module; The support bracket (1) is provided with a re-absorption component for sampling oil, and the vertical base (2) is provided with an interface component for driving the light-transmitting circuit and the re-absorption component to operate after the bottom U-shaped bracket (5) penetrates into the oil level line.

2. The electric power test device for electric power maintenance according to claim 1, characterized in that: The light-transmitting circuit further comprises an operational amplifier electrically connected to the photoresistor (7) and a microcontroller for receiving and processing signals, wherein both the operational amplifier and the microcontroller are electrically connected to the power module; The light-transmitting circuit also includes a display electrically connected to the microcontroller to display the result of processing the signal.

3. The electric power test device for electric power maintenance according to claim 2, characterized in that: The re-suction assembly comprises two sets of side plates (8) fixedly connected to the vertical base (2), and a traverse rod (9) freely movable in the horizontal direction is slidably penetrated between the two sets of side plates (8); A pumping cylinder (34) is bolted to the support bracket (1), and a piston plate (33) is fixedly connected to the side of the traverse rod (9) facing the pumping cylinder (34) and in sliding contact with the inner wall of the pumping cylinder (34); The pumping cylinder (34) is fixedly provided with an oil return pipe (35) and an oil outlet pipe (36). The ends of the oil return pipe (35) and the oil outlet pipe (36) away from the pumping cylinder (34) are respectively fixedly connected to the bottom extension U-shaped frame (5) and the support bracket (1). A sample tube (37) is placed on the support bracket (1) at a position corresponding to the oil outlet pipe (36).

4. The electric power test device for electric power maintenance according to claim 3, characterized in that: The vertical base (2) is provided with a gear (38) that rotates freely in the vertical direction, the gear (38) is meshed with a back-facing rack (39), and the back-facing rack (39) is fixedly connected to the depth plate (3); A positioning pin (10) is slidably penetrated through the traverse rod (9), and a corrugated groove (4) for the positioning pin (10) to slide is provided on the depth plate (3).

5. The electric power test device for electric power maintenance according to claim 4, characterized in that: The position limiting assembly comprises a hollow trigger frame (13) fixedly connected to a vertical base (2); a transverse plate (18) freely movable in a horizontal direction is provided on the hollow trigger frame (13); two groups of blocking columns (14) are arranged on the transverse plate (18) to rotate on a fixed axis; the two groups of blocking columns (14) both comprise an integrally formed side convex portion (141); The hollow trigger frame (13) is provided with a blocking circular groove (15) for the blocking column (14) to slide, and a limiting pin (16) is fixedly connected to the side of the hollow trigger frame (13) facing the blocking column (14), and the blocking column (14) is provided with a spiral groove (17) for the limiting pin (16) to slide; The positioning pin (10) is fixedly connected to a work-shaped seat (12) on one side facing the hollow trigger frame (13); the work-shaped seat (12) is abuttingly connected to the side convex portion (141); a positioning spring (11) is sleeved on the outer peripheral surface of the work-shaped seat (12); and two ends of the positioning spring (11) are respectively fixedly connected to the work-shaped seat (12) and the traverse rod (9).

6. The electric power test device for electric power maintenance according to claim 5, characterized in that: The hollow trigger frame (13) is provided with a connecting column (19) that can freely move in the horizontal direction. The connecting column (19) is fixedly connected to the transverse plate (18). The end of the connecting column (19) away from the transverse plate (18) includes an integrally formed end frame portion (191). The end frame portion (191) is provided with a plurality of groups of snap-fitting balls (21) and is provided with ball cavities for the snap-fitting balls (21) to slide. The hollow trigger frame (13) comprises an integrally formed inner step portion (131), the inner step portion (131) and the engaging ball (21) are in abutting connection with each other, the outer ring of the connecting column (19) is provided with a return spring (20), and the two ends of the return spring (20) are respectively fixedly connected to the end frame portion (191) and the hollow trigger frame (13).

7. The electric power test device for electric power maintenance according to claim 6, characterized in that: A movable copper sheet (31) is fixedly connected to the transverse plate (18), and a positioning copper sheet (32) is fixedly connected to the hollow trigger frame (13) at a position corresponding to the movable copper sheet (31). Both the movable copper sheet (31) and the positioning copper sheet (32) are electrically connected to the light-emitting diode (6).

8. The electric power test device for electric power maintenance according to claim 7, characterized in that: The boundary assembly further comprises a compressed air column (28) fixedly connected to the depth plate (3); a gas passage (27) for sliding of the compressed air column (28) is provided at a position corresponding to the compressed air column (28) on the vertical base (2); the gas passage (27) comprises an integrally formed closing portion (271); The hollow trigger frame (13) is fixedly connected to an elastic sheet (23), a sealed inner chamber (24) is formed between the elastic sheet (23) and the hollow trigger frame (13), and a plug pin (22) is fixedly connected to the inner chamber (24) toward the end frame portion (191) and is in abutment with the engaging ball (21); The inner chamber (24) is also fixedly connected to a pull pin (26), the pull pin (26) radially penetrates the hollow trigger frame (13) and is sleeved with a limit spring (25) on its outer circumference, and the two ends of the limit spring (25) are respectively fixedly connected to the elastic sheet (23) and the hollow trigger frame (13); The inner chamber (24) is in gas communication with the closing portion (271).

9. The electric power test device for electric power maintenance according to claim 8, characterized in that: The vertical base (2) has a No. 1 pressure-compensating pipe (29) and a No. 2 pressure-compensating pipe (30) fixedly connected at the position corresponding to the closing portion (271), and the ends of the No. 1 pressure-compensating pipe (29) and the No. 2 pressure-compensating pipe (30) away from the vertical base (2) are fixedly connected to the bottom extending U-shaped frame (5) and the hollow trigger frame (13), respectively, and the No. 2 pressure-compensating pipe (30) is in gas communication with the inner chamber (24).

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