The TZH series generators have distinct advantages over the STC series generators:  Compound excitation, simple circuit design, high reliability and easier maintenance.  These units have excellent dynamic characteristics when loaded or unloaded suddenly. Lights on the circuit light will not flicker.  With a strong starting system, motors up to 70% of the Units capacity volume can be directly started without tripping an overload switch.  Approaching voltage sine wave and regulated power supply output voltages, these Units can be safely used with computers.  The deviation of the 3-phase line voltage will be less than 3% when the generators have unbalanced phase loading.