2. theory and basic principles of measuring voltage brake down.2.1 the properties and characteristics of electrical insulationInsulating gas that is essential to insulating high voltage technical. Used as the main insulation. This research uses a gas-insulated air-dielectric, which is to try to find the brake voltage down air dielectric, which is very popular in the country's power distribution system. No advantage is the cost of insulation, but the disadvantage is that there may be affected by humidity. The heat and may affect the chemical reactions between the air with a conductor of electrical equipment.2.2 theory of brake-down occurs.The emergence brake down in gas is to change the condition of the insulation into the conductivity is the range between the current picture status prathang themselves do not. The current image to prathang itself. The range will occur when the number of electrons or ions, it has Grand in the Wah lan, Kae has enough conductivity and electrical braking dawn is to enter the voltage value of the insulation which exceeds the ability of the insulation to endure or withstand voltage electric field it will happen, so the electricity flows through the insulation and insulation-such increase until the patience of down to brake up [8], [9].
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