... system 2.Good environmentally-friendly protection system 1. The standard protection for HL series generator is IP232. Windings are insulated to class ... generators are provided with a 2/3 winding pitch as standard, can effectively eliminate the third harmonic(3rd, 9th, 15th, ... THF≤2%, telephone effedtive factor of TIF≤50 HL Series 50HZ Three-Phase(or Single Phase) Brushless Synchronous Generator