What is the effect of voltage unbalance on a three-phase motor
Voltage imbalance will lead to overheating, loss of efficiency, increased vibration, and torque reduction in three-phase motors during their operation. For every 1% increase in voltage imbalance, the temperature rise increases by 6% to 10%. Regular voltage balance testing and correction devices are effective ways to prevent failures. Overheating Voltage imbalance is one of the […]
Three-Phase Motor Overload Protection Methods
Thermal relays, magnetic protection, and electronic relays can provide overload protection in three-phase motors. The trip current is usually set at 1.1 to 1.5 times the rated current. The response time may be flexibly adjusted according to load conditions so that a long load, as well as damages for a short circuit, will be avoided. […]