Question

2. For each of the following five vector diagrams below state which operational changes have been made to the generator always compared to the initial state at synchronization. (Tsynch and IFsynch) and define hence its operational mode (generator/motor, inductive/capacitive). (5%) for each of the five assessments. a./ E/=/v./, torque angle is positive b./E/</v./, torque angle is positive Is c./E/>/v./, torque angle is positive d./E/>/v./, torque angle is 90° E bs e./ E /=/v./, torque angle is negative Vo

Answer 1

when when E leads V of v lags E ; it is a generator Elags vol v leads E, Ťt is a motor E leads r , Hence generator ECOS8 <V , tlence leading powerfac too Alteonator at leading power factor abeoobsa Hence, Inductor o expo Generator ELOSS<V, leading powesfactor, s Ecoss -Inductor Generator Else = V, unity power factor To Generator ELOSS=0 <V, ZPF lead, Inductor near ht Vit Vloads E, motor EWSS<6V , legging powesfactor Inductor

I Alt * | Eacitation Synchronous motor. Delives o operates at lead. over excitation Ecosd>V Delivers' operates at lag Absoobs 'a' Operates at lead of Under excitation -Absoobs'a operates at long Pof Nornial excitation Neither absooks, not delivers UPF UPF