2 Safety for man and machine means that a trouble-free power supply and uninterrupted operation is guaranteed. The convincing advantages for operators of electrical systems are: n Higher operational safety through early detection of possible critical operating and system states n Comprehensive protection of persons and installations against the risks posed by electrical current n Increased productivity n Significant reduction of operating costs n Time and cost optimised maintenance Electrical safety for man and machine Bender monitoring systems make a decisive contribution Long-term cost reduction with Bender monitoring systems Insulation faults Costs Bender monitoring system Potential for cost reduction Maintenance costs Present maintenance costs Maintenance costs transition period Service life Future maintenance costs