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Terminals for low-voltage equipment insulation damage analysis
Published：2013-05-31 11:02:14 Views：
Elinker electric limited by virtue of the financial trade zone developed information, rich talent resources in product development, marketing, quality management, customer service, multifaceted efforts to improve, increasing the strength and competitiveness of enterprises. Continuously improving our products and services, has offices throughout the country, products are exported to the international market.
Insulation coordination is defined as product use and the surrounding environment is required to select electrical insulation properties, only based on its life period through various roles (such as voltage and other factors) intensity, product insulation coordination can be achieved the ultimate goal. Following Elinker electrical technicians Union express terminals for low-voltage equipment insulation damage and analysis of influence factors:
1, insulation breakdown (thermal shutdown)
That is, under the action of electric field, dielectric heating due to dielectric loss, if the heat lost in time, temperature increases, leading to low molecular weight volatile escapes and the molecular structure of the material damage, eventually cause insulation breakdown.
Factors affecting insulation breakdown:
Temperature-rise in temperature, the materials Breakdown voltage drop
Humidity-humidity increases, the materials Breakdown voltage drop
Voltage voltage-time time, material Breakdown voltage drop
Frequency-frequency increase, the materials Breakdown voltage drop
Material thickness-material thickness increased heat adverse, breakdown voltage drop
2, insulation aging
The insulating material under the action of the various factors in the operation of equipment, irreversible physical and chemical changes taking place, leading to sharp changes in the electrical and mechanical properties of the material damage and aging.
Such as: thermal ageing, insulation materials in the heat, under the action of oxygen, water, individually or jointly, low molecular weight or volatile products escapes; generate free radicals involved in the chain reaction of the molecular chains break; triggered automatically as a catalyst to accelerate the material damage hydrolytic degradation; or have a polymer chain polymerization, resulting in performance degradation or complete destruction of materials.
Aging, due to partial discharges O3, nitric oxide, fast-moving particles, and dielectric loss caused by partial discharges increased material heating, causing material degradation or complete destruction.