Oil duct strips are made of rectangular bracing strips and diamond dotted paper by using a special adhesive paste. They are widely used in the field of oil-immersed transformers. They have successfully replaced traditional corrugated cardboard and effectively solved the problem of easy deformation and displacement of corrugated cardboard. At the same time, they significantly improve the mechanical and electrical properties of transformers.
In the material selection stage of manufacturing oil duct strips, high-quality rectangular bracing strips and diamond dotted paper are selected as the basic materials. Rectangular bracing strips are generally made of high-density insulation laminated wood or epoxy resin composite materials, which have excellent mechanical strength and insulation properties. Diamond dotted paper is a specially treated insulation material. It has a diamond-shaped glue layer on the surface. This design greatly increases the bonding area and thus improves the bonding strength. Before being put into use, the materials must undergo strict factory inspection, covering items such as appearance inspection, size measurement and performance testing.
The pasting process is the core of the entire manufacturing process. Operators will use a special adhesive. This adhesive has excellent bonding performance and high temperature resistance, and can remain stable in the high temperature environment of transformer operation. Before pasting, the surface of the material needs to be cleaned to remove dust and oil. During pasting, it is fixed with a special clamp to ensure that the support bar and the insulation paper are accurately positioned. After pasting, apply appropriate pressure and maintain it for a certain period of time to fully cure the adhesive. During this process, temperature, humidity and pressure must be strictly controlled to obtain the best bonding effect.
Multiple inspection methods are used in the quality inspection process. First, a visual inspection is carried out to check whether there are obvious bubbles, wrinkles or glue marks on the pasted surface. Then a manual inspection is carried out to test the bonding strength by applying a moderate external force. For important products, non-destructive testing methods such as ultrasonic testing are also used to check whether there are defects inside. All inspection processes must be recorded in detail to ensure that product quality is traceable.
Dimensional control runs through the entire manufacturing process. From dimensional measurement when raw materials are put into storage, to dimensional inspection when semi-finished products are processed, to dimensional verification of the final product, each link follows strict tolerance requirements. In particular, the thickness of the strips and the width of the insulation paper, these key dimensions directly affect the degree of fit between the product and the coil. Modern manufacturing workshops use high-precision measuring instruments, such as digital calipers, projectors, etc., to ensure that the dimensional accuracy is controlled within the allowable range.
The entire manufacturing process needs to be carried out in a clean environment with constant temperature and humidity to prevent material deformation and contamination. The completed oil duct strips are also subject to sampling destructive tests to verify their performance under actual working conditions. Only products that pass all inspections can be packaged and stored for subsequent assembly and use. This rigorous manufacturing process ensures that the oil duct strips can operate stably and for a long time in the transformer, ensuring the safe operation of power equipment.
• Heat dissipation
Transformers generate a lot of heat during operation. If the heat cannot be dissipated in time, the temperature of the transformer will rise, which affects its performance and service life. The oil duct strips construct oil channels in the transformer so that the insulating oil can flow between the stays, thereby taking away the heat and exerting a heat dissipation effect. A reasonably designed oil duct strip structure can improve the flow efficiency of the insulating oil and enhance the heat dissipation effect.
• Insulation effect
As an insulating component, the oil duct strip separates the high-voltage winding and the low-voltage winding of the transformer to prevent electrical short circuits. At the same time, it can also withstand the electric field effect during the operation of the transformer to ensure the stability of the electrical insulation performance. In the transformer, the oil duct strips and the insulating oil together constitute the insulation system of the transformer, providing protection for the safe operation of the transformer.
• Mechanical support
The windings and other components inside the transformer require certain mechanical support to ensure their stability during operation. The oil duct strips can play a mechanical support role, keeping the windings and other components in a fixed position to avoid displacement or deformation under the action of electromagnetic force or vibration.
In addition to transformers, oil duct strips are also used in some other electrical equipment, such as reactors. In reactors, oil duct strips also have the functions of heat dissipation, insulation and mechanical support. Since the working principle and structural characteristics of reactors are different from those of transformers, the performance requirements for oil duct strips may also be different. For example, reactors may generate higher electromagnetic forces during operation, which requires oil duct strips to have better mechanical strength and vibration resistance.
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