Winding resistance testing of motors

Winding resistance measurements detect various faults in motors and transformers: shorted turns, loose connections, broken strands and malfunctioning tap changer mechanisms. Winding resistance measurements detect problems in motors which other tests may not find. These problems include partial or fully shorted coils, poor crimps or connections, imbalance between phases (improper turns on phases) and incorrect […]

Understanding the basics of power measurement theory

Electrical power applications are changing rapidly. LED lighting is replacing incandescent lamps, variable speed motor drives replace directly coupled electric motors, and photovoltaic (PV) installations and wind turbines generate additional electrical power. This means the load on the electric network is changing. More harmonics and more risk of unbalance. This so called “bad” power costs […]