New TZH series have five advantages comparing with STC series generators. Phase compound excitation, simple circuit, high reliability, easy maintenance. Good dynamic characteristics suddenly applying or removing load, the light lining circuit will not twinkle. Smoothly starting characteristics, 70%full load capacitor motors can be directly started, the switch may not tripped. Excellent voltage wave form and good voltage regulation, computers can also be safely use. Better voltage equality under unbalanced load. 3-phase voltage unbalancedless than3%.