Isolation coordination

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Under insulation coordination mutual coordination between electrical insulation voltage stresses on the one hand and stamina electrical insulation on the other hand understood. In international as well as in German standardization, a distinction is made between insulation coordination for electrical equipment in high-voltage systems and insulation coordination for electrical equipment in low-voltage systems.

Terms, principles of insulation coordination , requirements for insulation coordination and guidelines for use in the high-voltage area are specified in IEC publication IEC 60071. This corresponds to the European standard EN 60071, in the German version DIN EN 60071 (VDE 0111) "Isolation coordination " .

The relevant standards in the low-voltage range (up to a rated alternating voltage of 1000 volts or a rated direct voltage of 1500 V) are internationally IEC 60664, corresponding to European EN 60664 and in German language version DIN EN 60664 (VDE 0110) "Insulation coordination for electrical equipment in low-voltage systems " . A method for dimensioning the insulating clearances and creepage distances for electrical equipment in low-voltage systems is described here.

The standard names the following dimensions:

• Minimum clearance to avoid electrical breakdown . These are independent of the micro-environmental conditions, provided they exceed a certain minimum size.
• Minimum creepage distances for pollution degrees 1 to 4 to avoid failure due to the formation of creepage paths along the surface of the insulating material.
• Minimum creepage distances to avoid electrical flashover along the surface of the insulating material.