Insulation levels in electrical equipment are characterized by the withstand voltages used during the design tests. There are two basic classifications of insulation strength: Basic Insulation Level (BIL) or lightning-impulse withstand voltage, and power-frequency withstand voltage (often called “hipot” voltage).
What is flashover voltage?
flashover voltage. [′flash‚ō·v?r ‚vōl·tij] (electronics) The voltage at which an electric discharge occurs between two electrodes that are separated by an insulator; the value depends on whether the insulator surface is dry or wet. Also known as sparkover voltage.
What is the Megger test?
As you know good insulation has high resistance and poor insulation relatively low resistance. The Megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. For good insulation, the resistance usually reads in the megohm range.