DDP insulation material, full name Diamond Dotted Paper, is a diamond-shaped structure material formed by evenly coating special epoxy insulation resin on electrical insulation paper. This material is widely used in the coil turn insulation of oil-immersed power transformers and the coil layer insulation of distribution transformers. The dot distribution design of its resin can significantly promote the penetration of insulating oil and gas discharge, effectively avoid corona phenomenon and partial discharge problems, and provide solid protection for the safety and reliability of the insulation structure.
Insulation performance: DDP can effectively isolate windings and other components, and prevent leakage and arc faults.
Pressure resistance: The unique diamond-shaped structure enables it to withstand high pressure and high temperature environments, ensuring the stable operation of the transformer under extreme working conditions.
Heat dissipation efficiency: The dot distribution of the resin optimizes the flow path of the insulating oil, accelerates gas discharge, significantly improves the heat dissipation efficiency of the transformer, and extends the service life of the equipment.
Protection function: It not only provides insulation protection, but also suppresses corona and partial discharge through structural design to ensure long-term and reliable operation of the transformer.
The main reason why high-performance oil-immersed transformers cannot do without DDP insulation materials is its excellent insulation performance and protective effect. Specifically analyzed:
High breakdown voltage guarantee
DDP insulation materials have extremely strong voltage resistance. This feature enables it to effectively block the risk of short circuits between coil layers and turns, and build a barrier for the safe operation of transformers.
Excellent thermal stability
DDP uses special modified epoxy resin, and its heat resistance level is significantly higher than that of ordinary materials. It can maintain stable performance for a long time in a high temperature environment, which greatly reduces the risk of insulation failure caused by thermal aging and fundamentally extends the service life of the transformer.
Excellent mechanical bonding strength
During the curing process, the epoxy resin coating melts and produces a strong adhesion effect, so that the adjacent layers of the winding form a stable bonding unit. This feature can effectively prevent the displacement of the winding layers during short circuit, ensuring that the insulation structure maintains the dual stability of mechanical and electrical performance in long-term operation.
Low-loss electrical characteristics
DDP has an extremely low dielectric loss tangent value and generates less heat during operation. This can not only improve the energy efficiency of the transformer, but also reduce the insulation degradation problem caused by temperature rise.
Winding displacement suppression mechanism
Through the bonding effect of epoxy resin, DDP material can firmly fix the winding structure when the transformer encounters a short-circuit fault, avoiding insulation damage and secondary short-circuit risks caused by displacement, and improving equipment reliability from a mechanical level.
Partial discharge optimization design
The diamond dispensing structure significantly reduces the probability of partial discharge by optimizing the insulation gap and oil channel distribution. Partial discharge, as a common hidden danger of transformer insulation system, will accelerate material aging, and the structural design of DDP material curbs this problem from the source, greatly improving operational reliability.
Significantly enhanced overload capacity
With high heat resistance and mechanical strength, DDP material can enable transformers to withstand higher overload current and temperature shocks, meet the power supply needs of the power grid during peak load, and is especially suitable for scenarios with large load fluctuations.
Full life cycle cost optimization
Combining insulation performance and protection, DDP material can effectively reduce the failure frequency and maintenance requirements of transformers, reduce operation and maintenance costs from the perspective of the full life cycle of equipment, and extend service life.
In the design and operation of high-performance oil-immersed transformers, DDP insulation materials, with their comprehensive performance of electrical insulation, mechanical stability, heat dissipation optimization, and fault protection, have become the core material to ensure high reliability and long life of equipment. From the micro-structure diamond dispensing design to the macro-application system protection function, its technical characteristics are deeply coupled with the operation requirements of the transformer, establishing an irreplaceable position in the industry.
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