Q:) in a 120 V) comPound generator, the resistance of the armature, shunt and series windings ave g0684,25S4yand ojo4r the Load curent is (lo0A at 120v). Find the respectively. arenature current and induced emf when the machine is Connected Long shunt @as short shunt :
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- A 100KVA, 6.6 kV 3 PHASE star connected cylindrical pole synchronous generator has 20-ohm as synchronous reactance and the armature resistance is negligible and the generator is working at the full load and unity power factor then find the value of the induced emf voltage(line to line).A 25kVA, 3-phase, wye connected, the 400-V synchronous generator has a synchronous reactance of 1.6 per phase. The generator is to have zero voltage regulation at full-load. Neglecting the armature resistance, find the operating power factor and the developed power.A 100KVA, 6.6 kV 3 PHASE star connected cylindrical pole synchronous generator has 20-ohm as synchronous reactance and the armature resistance is negligible and the generator is working at the full load and unity power factor then find the value of the induced emf voltage(line to line). Answer fast
- a) With the aid of a diagram and phasor diagram, explain the double-reactance concept for salient-pole alternators. b) 3-phase star-connected synchronous generator supplies a current of 10A having phase angle of 20° lagging 400V (phase voltage). Given the direct and quadrature axis reactances as 10ohms and 6.5ohms respectively and neglecting armature resistance, Find: 1. The load angle 2 The direct and quadrature components of armature currents 3. Voltage regulation1- Static synchronous compensator (STATCOM) for powe factor improvement. 2- What is penalty factor? Derive the expression for the penalty factor in economic load dispatch.(vi) Explain the concept of load transfer between the DC generators operating in parallel using load –voltage characteristics.
- Two generators rated 200MW and 400MW are operating in parallel. The droop characteristics of both the governor have a drop of 4%. from no load to full load. Assuming that the generators are operating at 50Hz at no load, how would a load of 600MW be shared between them? What will be the system frequency at this load? Assume free governor operation.(a) A short shunt cumulative compound dc generator supplies 6kW at 235V. The Shunt field resistance, Series field resistance and Armature resistances are 8012, 0.192 and 0.22 respectively. Calculate the induced emf and load resistance.Explain the concept of load transfer between the DC generators operating in parallel using load -voltage characteristics.
- a) 3-phase star-connected synchronous generator supplies a current of 10A having phase angle of 20° lagging 400V (phase voltage). Given the direct and quadrature axis reactances as 10ohms and 6.5ohms respectively and neglecting armature resistance, Find: 1. The load angle 2 The direct and quadrature components of armature currents 3. Voltage regulationIn a long-shunt compound generator, the terminal voltage is 220 Vwhen generator delivers 110 A. Determine (a) induced emf and (b)total power generated. Given that shunt field, series field,diverter and armature resistances are 90 Ω, 0.025 Ω, 0.04 Ω and0.03 Ω respectively.A long shunt compound DC generator delivers a load current of 150A at 230V and has armature, series field and shunt field resistances of 0.032, 0.015 and 92Ωrespectively. Calculate (i) induced emf (ii) total power generated and (iii) distribution of this power (iv) voltage regulation