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Insulation Coordination01:23

Insulation Coordination

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Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
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Performance Research and Formulation Optimization of High-Performance Local Insulation Spray Coating Materials.

Hechen Liu1, Liwei Wei1, Fengsheng Gao1

  • 1Hebei Key Laboratory of Green and Efficient New Electrical Materials and Equipment, North China Electric Power University, Yonghua North Street No. 619, Baoding 071003, China.

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Summary
This summary is machine-generated.

This study enhances epoxy resin for bird nest deterrence on power lines by adding nanoparticles. The modified resin shows significantly improved strength, flexibility, and electrical resistance.

Keywords:
nano-Al2O3nano-SiO2orthogonal test methodpolyurethane-modified epoxy resin

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrical Engineering

Background:

  • Bird nests on distribution network lines pose operational challenges.
  • Epoxy resins offer rapid, room-temperature curing for nest site coating but require toughening due to brittleness and internal stress.

Purpose of the Study:

  • To toughen polyurethane-modified epoxy resin for bird pest control applications.
  • To investigate the effects of Al2O3, SiO2, and Mg(OH)2 particle fillers on resin properties.
  • To optimize filler composition for enhanced mechanical and electrical performance.

Main Methods:

  • Modification of polyurethane-modified epoxy resin with Al2O3, SiO2, and Mg(OH)2 particles.
  • Design of orthogonal experiments to study filler effects.
  • Evaluation of mechanical properties (tensile strength, elongation at break), electrical properties (breakdown strength), and thermal properties (glass transition temperature, T g).

Main Results:

  • Synergistic effects observed between different particle fillers.
  • Nanoparticles mitigated microparticle-induced defects, improving resin properties.
  • Optimized composition (1.7% SiO2, 2.5% Al2O3, 7% Mg(OH)2) yielded a 70% increase in tensile strength, 67.53% increase in elongation at break, and 20.31% increase in breakdown strength.
  • Glass transition temperature (T g) increased by 13.48 °C, indicating enhanced rigidity.

Conclusions:

  • The addition of SiO2, Al2O3, and Mg(OH)2 significantly enhances the mechanical and electrical properties of polyurethane-modified epoxy resin.
  • The toughened resin is suitable for coating power line components to deter bird nesting.
  • Filler synergy and nanoparticle defect reduction are key to performance optimization.