A and B operate in parallel
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- Two shunt generators A and B operates in parallel and their load characteristicsmay be taken us straight lines. The voltage of the generator A falls from 240 V atno-load to 220 V at 200 A while that of B falls from 245 V at no load to 220 V at150 A. Determine the current which each machine supplies to a common load of300 A and the bus-bar voltage at this load.Two shunt generators A and B operate in parallel and their load characteristic s may be taken as straight lines. The voltage of A falls from 240 V at no - load to 220 V at 200 A, while that of B falls from 245 V at no - load to 220 V at 150 A. Determine the current which each machine supplies to a common load of 300 A and the bus - bar voltage at this load.What are the conditions in paralleling of these DC Generators:a. Shuntb. Seriesc. Compound
- . Two dc shunt generators A and B are rated at 100 and 150 kW at 110 V respectively, Their external load characteristics may be considered as straight line. The voltage drop In the terminal voltage from no-load to full-load Is 10 V for A and 20 V ſor B. Determine the operating voltage when these generators are operated in parallel to supply a load of 220 kW.What is load curveConsider the three single-phase two-winding transformers shown in Figure. 3. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in A, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a', b', and c' such that VAN is 90° out of phase with V₂'b' for positive sequence. DI H₂ Figure. 3: Three-Winding Transformer
- Discussion:- 1. What do you understand by "armature- reaction"? Discuss the effect of armature reaction in an alternator when it is loaded with resistive, inductive and capacitive loads. 2. Give the value of voltage regulation for different power factors at full load current and interpret their values.Combination circuit what is PT? RT? IT? Voltage Across each load?.Two dc shunt generators A and B are rated at 100 and 150 kW at 110 V respectively, Their external load characteristics may be considered as straight line. The voltage drop In the terminal voltage from no-load to full-load is 10 v for A and 20 V for B. Determine the operating voltage when these generators are operated in parallel to supply a load of 220 kW.
- Two transformers A and B are connected in parallel to a load of (2+j1.5) ohms. Their impedances in secondary terms are ZA= (0.15+j0.5) ohm and ZB = (0.1+j0.6) ohm. Their no-load terminal voltages are Ex=207 volt and EB-205 volt. Find the power output and power factor of each transformer.A 500 MVA synchronous machine has H, = 5.6 MJ/MVA and a 1200 MVA machine has H₂ = 2.0 MJ/MVA. The two machines operate in parallel in a power station. What is the equivalent. H constant for the two, relative to a 100 MVA base?In a given system of base power of 250 MW, and bus 3 is taken as reference. The per-unit reactances are X12 = 0.2 p.u., X13 = X23 = 0. 1 p.u. The power flow in the system is given as: PF12 = 50 MW, PF13 = 150 MW, PF23 = 50 MW. Based on readings from 2 meters (not including M12 meter), M13 = 145 MW (not calibrated), and M23 = 50 MW (well calibrated), deduce the flow on line 1-2. Select one: O a. PF12 = - 47.5 MW. O b. None of these O c. PF12 = 67.5 MW. O d. PF12 = 47.5 MW. O e. PF12 =- 57.5 MW. O f. PF12 = 57 MW.