Device for measuring strain vibration noise of transformer in uniform pressure state
By installing sensors on the core model and applying different clamping forces, the problem that transformer noise measurement devices in the existing technology are difficult to accurately measure strain vibration noise under actual working conditions is solved, and more accurate transformer noise measurement is achieved.
Patent Information
- Application Number
- CN202423207336.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing transformer noise measurement devices are difficult to accurately measure strain vibration noise under uniform pressure conditions under actual working conditions, especially for transformers with large volume and high voltage level, which makes experiments difficult.
A measurement device is designed. By installing strain sensors and vibration sensors on the core model, using a torque wrench to apply different clamping forces, combined with the core clamp and tension spring, the working state of the transformer under different compression forces is simulated to perform accurate strain, vibration and noise measurements.
It provides more accurate model parameters and more precise test conditions for transformer strain, vibration and noise measurement, and can measure the strain deformation state and vibration and noise parameters of the core model under different clamping forces.
Smart Images
Figure CN223426789U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of devices for measuring strain vibration noise of transformer under uniform pressure state, belong to the technical field of special equipment for power transformer electromagnetic experiment. BACKGROUND
[0002] With transformer more and more close to residential area and the enhancement of people's environmental awareness, the noise problem of transformer has been highly valued by electric power department and transformer manufacturing factory. Transformer noise is one of important technical parameters of transformer. Transformer noise is generated by the vibration of core, winding, oil tank (including magnetic shield etc.) and cooling device, and is a continuous noise. The noise of transformer mainly depends on the radiation noise of core vibration. The reason of core noise is that under the action of alternating magnetic field of silicon steel sheet constituting core, micro change, i.e. magnetostriction, occurs. Magnetostriction makes core do periodic vibration with excitation frequency change. The vibration amplitude is related to magnetic flux density in core lamination and magnetic property of core material, and has little relation with load current. The noise of core is closely related to core compression force and core tension force. The clamping force of core has an optimal value. When the optimal clamping force is reached, the noise is lowest. Changing the clamping force of core can make the noise change 0-5dB(A). Therefore, it is very important to measure strain vibration noise of transformer under uniform pressure state. At present, the existing transformer on product line is large in size and high in voltage grade. It is difficult to test vibration noise system under actual working condition. It is very important to simulate transformer related working condition by core model for experiment. CONTENT OF UTILITY MODEL
[0003] The utility model aims at providing a kind of device for measuring strain vibration noise of transformer under uniform pressure state. Strain, vibration sensor, core clamp and tension spring are arranged in the reserved position of core model. Different clamping force is applied to fastener and tension spring by using torque wrench. The working state of transformer product under different compression force is simulated. More accurate model parameters are provided for strain vibration noise measurement test. The above technical problems existing in prior art are solved.
[0004] The technical scheme of the utility model is as follows:
[0005] A device for measuring the strain, vibration and noise of a transformer under a uniform pressure state comprises a low-voltage side upper clamp, a low-voltage side lower clamp, a high-voltage side upper clamp, a high-voltage side lower clamp, an iron core model, a lower low-magnetic steel pull plate and an upper low-magnetic steel pull plate; the low-voltage side lower clamp and the high-voltage side lower clamp are arranged parallel to each other on an experimental platform, two mutually parallel lower low-magnetic steel pull plates are arranged perpendicular to the low-voltage side lower clamp and the high-voltage side lower clamp, the low-voltage side lower clamp, the high-voltage side lower clamp and the two mutually parallel lower low-magnetic steel pull plates constitute a lower square frame; the low-voltage side upper clamp and the high-voltage side upper clamp are arranged parallel to each other, two mutually parallel upper low-magnetic steel pull plates are arranged perpendicular to the low-voltage side upper clamp and the high-voltage side upper clamp, the low-voltage side upper clamp, the high-voltage side upper clamp and the two mutually parallel upper low-magnetic steel pull plates constitute an upper square frame; the iron core model to be measured is arranged between the lower square frame and the upper square frame, and the iron core model and the lower square frame are arranged parallel to each other. The lower square frame and the upper square frame are both provided with clamp insulation and pull plate insulation; the upper clamp on the low-voltage side and the lower clamp on the low-voltage side, as well as the upper clamp on the high-voltage side and the lower clamp on the high-voltage side are fixed respectively by high-strength bolts; a bracket is provided at the bottom of the upper clamp on the low-voltage side and the lower clamp on the low-voltage side, and the bracket serves as the bottom support when the whole is placed upright; the iron core model is a square frame, and the left and right arms of the iron core model correspond to the positions of the lower low-magnetic steel pull plate and the upper low-magnetic steel pull plate, An insulating tube is provided outside the lower low magnetic steel pull plate and the upper low magnetic steel pull plate, and the insulating tube is firmly fastened by a shrinkage band; multiple sets of iron core clamps and tensioning springs are used to tighten the low-voltage side upper clamp and the low-voltage side lower clamp, and the high-voltage side upper clamp and the high-voltage side lower clamp; strain sensors and acceleration sensors are set at the detection positions of the low-voltage side upper clamp, the low-voltage side lower clamp, the high-voltage side upper clamp and the high-voltage side lower clamp to test the performance parameters of the iron core model.
[0006] Holes are opened on the detection positions of the low-pressure side upper clamp, the low-pressure side lower clamp, the high-pressure side upper clamp, the high-pressure side lower clamp and the upper low-magnetic steel pull plate, and strain sensors and acceleration sensors are arranged in the holes.
[0007] Coils are wound around the left and right arms of the core model as an excitation source and a test coil respectively.
[0008] The insulating cylinder is composed of a left half cylinder and a right half cylinder, both of which are C-shaped structures. The left half cylinder is inserted into the right half cylinder to form the insulating cylinder.
[0009] The clip insulation and the pull plate insulation are both made of insulating paperboard.
[0010] There are eight groups of core clamps and tensioning springs in total, four groups are used between the upper clamp on the low-pressure side and the lower clamp on the low-pressure side, the upper clamp on the low-pressure side and the lower clamp on the low-pressure side are fixed with four groups of core clamps, and the core clamps in the same group are tightened with tensioning springs; four groups are used between the upper clamp on the high-pressure side and the lower clamp on the high-pressure side, the upper clamp on the high-pressure side and the lower clamp on the high-pressure side are fixed with four groups of core clamps, and the core clamps in the same group are tightened with tensioning springs.
[0011] Different clamping forces are applied to high-strength bolts using a torque wrench to simulate the normal state of the transformer with different clamping forces. The real-time strain deformation state and vibration noise parameters of the core model are measured using acceleration sensors and strain sensors.
[0012] Multiple sets of core clamps and tension springs are sequentially applied with different compression forces to clamp the core model, and the real-time strain deformation state and vibration noise parameters of the core model are measured.
[0013] The beneficial effects of the utility model are as follows: by installing and arranging strain and vibration sensors at reserved positions of the model, using a torque wrench to apply different clamping forces to the clamping parts; using an iron core clamp and a tensioning spring to clamp the clamps on the high-voltage / low-voltage sides, the working conditions of the transformer product at different clamping forces are simulated, and more accurate model parameters are provided for the measurement test of the strain, vibration and noise of the transformer material. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the main structure of an embodiment of the utility model;
[0015] Figure 2 This is a schematic diagram of the top view of the structure of an embodiment of the utility model;
[0016] Figure 3 This is a schematic cross-sectional view of the left and right arms of the core model according to an embodiment of the present invention;
[0017] Figure 4 This is a front view of the upper clamp on the low-pressure side of an embodiment of the present utility model;
[0018] Figure 5 This is a front view of the lower clamping member on the low-pressure side of an embodiment of the present utility model;
[0019] Figure 6 This is a front view of the upper clamp on the high-pressure side of an embodiment of the present utility model;
[0020] Figure 7 This is a front view of the lower clamp on the high-pressure side of an embodiment of the present utility model;
[0021] Figure 8 This is a front view of the insulating cylinder of the embodiment of the utility model;
[0022] Figure 9 This is a side view of the insulating cylinder of the embodiment of the utility model;
[0023] Figure 10 is a disassembled view of the insulating cylinder according to an embodiment of the present application;
[0024] In the figure: low-voltage side upper clamping piece 1, low-voltage side lower clamping piece 2, high-voltage side upper clamping piece 3, high-voltage side lower clamping piece 4, core model 5, lower low-magnetic steel pull plate 6, support 7, clamping piece insulation 8, pull plate insulation 9, insulating cylinder 10, shrinkable belt 11, core clamp 12, tension spring 13, strain sensor 14, acceleration sensor 15, high-strength bolt 16, cable 17, upper low-magnetic steel pull plate 18, left half cylinder 19, right half cylinder 20. DETAILED DESCRIPTION
[0025] The present application will be further described by way of examples with reference to the accompanying drawings.
[0026] A device for measuring strain vibration noise of a transformer under uniform pressure state comprises a low-voltage side upper clamping piece 1, a low-voltage side lower clamping piece 2, a high-voltage side upper clamping piece 3, a high-voltage side lower clamping piece 4, a core model 5, a lower low-magnetic steel pull plate 6 and an upper low-magnetic steel pull plate 18; the low-voltage side lower clamping piece 2 and the high-voltage side lower clamping piece 4 are arranged in parallel with each other on an experimental platform, two parallel lower low-magnetic steel pull plates 6 are arranged perpendicularly to the low-voltage side lower clamping piece 2 and the high-voltage side lower clamping piece 4, and the low-voltage side lower clamping piece 2, the high-voltage side lower clamping piece 4 and the two parallel lower low-magnetic steel pull plates 6 form a lower square frame; the low-voltage side upper clamping piece 1 and the high-voltage side upper clamping piece 3 are arranged in parallel with each other, two parallel upper low-magnetic steel pull plates 18 are arranged perpendicularly to the low-voltage side upper clamping piece 1 and the high-voltage side upper clamping piece 3, and the low-voltage side upper clamping piece 1, the high-voltage side upper clamping piece 3 and the two parallel upper low-magnetic steel pull plates 18 form an upper square frame; the core model 5 to be measured is arranged between the lower square frame and the upper square frame, and the core model 5 is provided with clamping piece insulation 8 and pull plate insulation 9 between the lower square frame and the upper square frame; the low-voltage side upper clamping piece 1 and the low-voltage side lower clamping piece 2 and the high-voltage side upper clamping piece 3 and the high-voltage side lower clamping piece 4 are fixed by high-strength bolts 16, respectively; the low-voltage side upper clamping piece 1 and the low-voltage side lower clamping piece 2 are provided with a support 7 at the bottom, and the support 7 serves as a bottom support when the device is placed upright as a whole; the core model 5 is a square frame, left and right arms of the core model 5 correspond to positions of the lower low-magnetic steel pull plate 6 and the upper low-magnetic steel pull plate 18, and the insulating cylinder 10 is arranged outside the lower low-magnetic steel pull plate 6 and the upper low-magnetic steel pull plate 18, and the insulating cylinder 10 is tightly bound by the shrinkable belt 11; the low-voltage side upper clamping piece 1 and the low-voltage side lower clamping piece 2 and the high-voltage side upper clamping piece 3 and the high-voltage side lower clamping piece 4 are pulled tightly by multiple core clamps 12 and tension springs 13; strain sensors 14 and acceleration sensors 15 are arranged at detection positions of the low-voltage side upper clamping piece 1, the low-voltage side lower clamping piece 2, the high-voltage side upper clamping piece 3 and the high-voltage side lower clamping piece 4, and performance parameters of the core model 5 are tested.
[0027] Holes are opened on the detection positions of the low-pressure side upper clamp 1, the low-pressure side lower clamp 2, the high-pressure side upper clamp 3, the high-pressure side lower clamp 4 and the upper low-magnetic steel pull plate 18, and the strain sensor 14 and the acceleration sensor 15 are arranged in the holes.
[0028] Coils are wound around the left and right arms of the core model 5 as an excitation source and a test coil respectively.
[0029] The insulating cylinder 10 is composed of a left half cylinder 19 and a right half cylinder 20 . Both the left half cylinder 19 and the right half cylinder 20 have a C-shaped structure. The left half cylinder 19 is inserted into the right half cylinder 20 to form the insulating cylinder 10 .
[0030] The clip insulation 8 and the pull plate insulation 9 are both made of insulating paperboard.
[0031] There are eight groups of core clamps 12 and tensioning springs 13, four groups of which are used between the upper clamp 1 on the low-pressure side and the lower clamp 2 on the low-pressure side. The upper clamp on the low-pressure side and the lower clamp on the low-pressure side are fixed with four groups of core clamps, and the core clamps in the same group are tightened with tensioning springs; four groups of which are used between the upper clamp 3 on the high-pressure side and the lower clamp 4 on the high-pressure side. The upper clamp on the high-pressure side and the lower clamp on the high-pressure side are fixed with four groups of core clamps, and the core clamps in the same group are tightened with tensioning springs.
[0032] The core model in the embodiment is a square frame of 800×800 mm, and the left and right arms of the core model of the square frame are respectively made of 4 mm 2 The cable 17 was wound into a 138-turn coil as an excitation source, and a 1 mm thin copper wire was wound into a test coil to test the performance parameters of the model.
[0033] The first operating condition test involved applying different clamping forces to high-strength bolts 16 using a torque wrench. An accelerometer (model: YA22s) and a strain gauge (model: BA120-5AA) were placed in the slots. An excitation source applied a voltage corresponding to the magnetic field strength, and the test probe was connected to the test coil. This simulated the transformer's normal clamping force at different levels, measuring the core model's strain, deformation, and vibration / noise parameters. The second operating condition test involved applying eight sets of core clamps 12 and tension springs 13, applying compression forces of 5kg, 10kg, 15kg, 20kg, 25kg, and 30kg, respectively, to the core model. The core model's strain, deformation, and vibration / noise parameters were measured. This vertical square core model, with its simple structure and easy assembly and disassembly, provides a specialized test device for electromagnetic testing of power transformers.
Claims
1. A device for measuring transformer strain, vibration and noise under uniform pressure, characterized by: The invention comprises a low-pressure side upper clamp (1), a low-pressure side lower clamp (2), a high-pressure side upper clamp (3), a high-pressure side lower clamp (4), an iron core model (5), a lower low-magnetic steel pull plate (6) and an upper low-magnetic steel pull plate (18); the low-pressure side lower clamp (2) and the high-pressure side lower clamp (4) are arranged parallel to each other on the experimental platform, and the two mutually parallel lower low-magnetic steel pull plates (6) are arranged perpendicular to the low-pressure side lower clamp (2) and the high-pressure side lower clamp (4), and the low-pressure side lower clamp (2), the high-pressure side lower clamp (4) and the two mutually parallel lower low-magnetic steel pull plates (6) constitute The lower square frame; the low-voltage side upper clamp (1) and the high-voltage side upper clamp (3) are arranged parallel to each other, and the two upper low-magnetic steel pull plates (18) are arranged perpendicular to the low-voltage side upper clamp (1) and the high-voltage side upper clamp (3), and the low-voltage side upper clamp (1), the high-voltage side upper clamp (3) and the two upper low-magnetic steel pull plates (18) constitute the upper square frame; the iron core model (5) to be tested is set between the lower square frame and the upper square frame, and the iron core model (5) and the lower square frame and the upper square frame are both provided with a clamp insulation (8) and a pull plate insulation. Edge (9); the low-pressure side upper clamp (1) and the low-pressure side lower clamp (2), the high-pressure side upper clamp (3) and the high-pressure side lower clamp (4) are fixed respectively by high-strength bolts (16); a bracket (7) is set at the bottom of the low-pressure side upper clamp (1) and the low-pressure side lower clamp (2), and the bracket (7) serves as the bottom support when the whole is placed upright; the iron core model (5) is a square frame, and the left and right arms of the iron core model (5) correspond to the positions of the lower low-magnetic steel pull plate (6) and the upper low-magnetic steel pull plate (18), and the lower low-magnetic steel pull plate (6) and the upper low-magnetic steel pull plate (18) are provided with a bracket (7) at the bottom. An insulating tube (10) is provided, and the insulating tube (10) is fastened firmly by a shrinking band (11); a plurality of sets of core clamps (12) and tension springs (13) are used to tighten the low-voltage side upper clamp (1) and the low-voltage side lower clamp (2) and the high-voltage side upper clamp (3) and the high-voltage side lower clamp (4); strain sensors (14) and acceleration sensors (15) are provided at the detection positions of the low-voltage side upper clamp (1), the low-voltage side lower clamp (2), the high-voltage side upper clamp (3) and the high-voltage side lower clamp (4) to test the performance parameters of the core model (5).
2. The device for measuring transformer strain, vibration and noise under uniform pressure according to claim 1, characterized in that: The detection positions of the low-pressure side upper clamp (1), the low-pressure side lower clamp (2), the high-pressure side upper clamp (3), the high-pressure side lower clamp (4) and the upper low-magnetic steel pull plate (18) are provided with slots, and the strain sensor (14) and the acceleration sensor (15) are arranged in the slots.
3. The device for measuring transformer strain vibration noise under uniform pressure state according to claim 1 or 2, characterized in that: Coils are wound around the left and right arms of the core model (5) as an excitation source and a test coil, respectively.
4. The device for measuring transformer strain vibration noise under uniform pressure state according to claim 1 or 2, characterized in that: The insulating cylinder (10) is composed of a left half cylinder (19) and a right half cylinder (20), both of which are C-shaped structures. The left half cylinder (19) is inserted into the right half cylinder (20) to form the insulating cylinder (10).