Three-phase AC motors and power through the external capacitor ( diesel engines, turbines , etc.) drag , can be temporary to generators for lighting or radio, small farm and sideline products processing machinery used . External capacitor connection External capacitors for the main capacitor of matching capacitors . The main capacitor main role is to enable the generator to self-excitation under no load condition to rated voltage output ; Vice capacitor is under load to maintain output voltage stability rating of the capacitor must be attached . Way linking the main capacitor bank voltage capacitor value should be . If the capacitor voltage value of 250V, you should take into Y -shaped ; if the capacitor voltage higher than 400V, you can take into the A -shaped . Use , in order to achieve the required capacitance , can use more than two capacitors in parallel ways , as shown in Figure 5-188 . Vice- link capacitor should load conditions. Typical distribution line Figure 5-189 is a two motor generator to change the typical distribution line .Vice- link capacitor should load conditions. Typical distribution line Figure 5-189 is a two motor generator to change the typical distribution line . Figure a) is used the following three-phase AC motor to change 3kW generator distribution lines, mainly used for lighting . Circuit , C is the motor switch to the generator , with Ah -shaped connection . The main capacitors Cl-C3 -shaped association with eight , Vice capacitors C4-C9 , respectively in the three-way parallel lighting ELl-EL3 ( load) on . PV S, voltmeter transfer switch . Figure b) is a high power motor to change the generator distribution lines , in addition can be used for lighting , it can also serve as a small motor ( inductive load ) and power supply . Circuit , G for the motor switch to the generator ; Cl-C3 for the main capacitor ; C4-C6 were three-way lighting ELl-EL3 vice capacitor , C7-C9 capacitor for the motor M of the vice ; Ql-Q4 for the control of a knife switch ; S PV conversion table for the voltage switch . Used to adjust the original motivation ( such as diesel or turbine ) speed , so that the output voltage generator G is 380V, frequency 50Hz can . Components Selection Three-phase AC motor to change the generator rated power should be greater than the load rated power above 20%. For example, the motor with 4.5kW power , the load then the power should be less than 3.6kW. Drag the original motive power and generator power to match . The main capacitors and vice capacitor capacitor polarity should be used . Table 5-2 is equipped with a capacitor motor power and capacity tables .