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The IEC 60085 specifies that an Insulation system permanently submitted to its Insulation Class temperature has a life expectancy of 20 000h. It defines the Insulation Class temperatures as follows: Insulation class H F B Temperature 180 °C 155 °C 130 °C (Reference Document: IEC 60085)
The electrical insulation system for wires used in generators, electric motors, transformers, and other wire-wound electrical components is divided into different classes by temperature and temperature rise. The electrical insulation system is sometimes referred to as insulation class or thermal classification.
30 lip 2016 · Class-H Insulation: Class-H insulations can withstands a temperature of up to 180°C. It is made of inorganic material glued with silicone resin or adhesives of equivalent performance.
25 lis 2010 · Electrical insulation systems are rated by standard NEMA (National Electrical Manufacturers Association) classifications according to maximum allowable operating temperature: 1) Allowable temperature rises are based upon a reference ambient temperature of 40oC.
NEMA motor insulation classes describes the ability of motor insulation in the windings to handle heat. There are four insulation classes in use namely: A, B, F, and H. All four classes identify the allowable temperature rise from an ambient temperature of 40° C (104° F).
The embedded devices provide an additional rise in temperature due to potential hot spots occurring at the measurement location. Figure 1 shows the total temperature for the Class H insulation for continuous duty as being 180°C.
The Temperature Index (or Relative Temperature Index) for a wire insulation is the temperature at the 20,000 hour intercept. The expected thermal endurance for other temperatures can be determined by finding the intercept
