A building use 3 phase inverter with SVPWM algorithm to back up power in case of electric cut out, where v=311.12 sin 2pi 50 t. Find T1, T2 and To at t=16 msec. Use Ts= 100 us
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- Q-3 A Cockeroft-Walton type voltage multiplier has ten stages with capacitances, all equal to 0.1 µF. The supply transformer secondary voltage is 100 kV at a frequency of 60 Hz. If the load current to be supplied is 5 mA, find (a) the percentage ripple, (b) the regulation, and (c) the optimum number of stages for minimum regulation or voltage drop.A A-A three transformer bank, each of 10 kVA supply a total load of 20 kVA. One of the transformer become, disable and hence the circuit works on V-V open delta connection. Find for this connection. (a) (b) (c) (d) (e) kVA load carried by each transformer. % of rated load carried by each transformer. Total kVA rating of V-V open A connection. Ratio of V-V and closed A ratings. % increase in load on each of the two V-V connected transformers. MVs=16cos100t Volt using T-equivalent circuit for For the circuit shown, find the steady-state 102 voltage "V" and the input power when 100 0.11I V=16cos100t Volt using T-equivalent circuit for transformer. 0.21I 0.211: 50 (Ans.: V=6cos100t Volt & Pin=11.2W)
- What effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.7. TY Hat CHICL Ans. 1. Iron los.........varies approximately as V². 2. Cu loss..........it also varies as ² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa. quemsSome power devices have bidirectional current capability Select one: O a. True b. False The voltage regulation of the transformer will depend on the load Select one: O a. For mainly inductive or resistive load, the voltage regulation is negative O b. For mainly capacitive, inductive or resistive load, the regulation is positive Oc. For mainly capacitive load, voltage regulation is positive and other loads it is negative. O d. For mainly capacitive load, voltage regulation is negative.
- Question: In bridge type stepup cycloconverter during positive half cycle of supply voltage.'Ph' is positive with respect to 'N'. The circuit completes its path as Option 1: N- P2- load - P3 - Ph Option 2: Ph- P2- load - P3 N Option 3: N- P1- load - P2 Ph Option 4: Ph- P1- load- P2 NQ2. Choose one only 1. Compare between load curve and duration load curve. 2. What do you understand by the load curve? What information's are conveyed by a load curve?Driving-point admittance The actual impedance of a load is 30 OHM. The per-unit impedance of the load is 0.5 pu when Base Voltage is 600 V and Base Power is of O 6000 VA O 8000 VA O2000 VA 4000 VA Jump to ncements MacBook Air DD DII F10 F9 F8 000 F7 F6
- Q2/3-phase.E.W.C. R using center tap transformer supplies highly inductive load, find: 1. The average load voltage with and without FWD and discusses these cases. 2-lf firing angle equal to 45°, the supply voltage is240v, transformer ratio is (2/1). Calculate the DC current& voltage of this case. 3- Draw all waveforms diagram. 4- what are the difference between the type of connection (Delta or Star).Y Design a half-bridge inverter for the following specifications. Vd=131-159 V Vo= 220 V RMS, f=50 Hz Po=550 W AIL= 5 A at the worst case fs-10 kHz Draw the schematic including the PWM.gènerator blocks. Assume open loop control. Find the turn ratio of the transformer to be used. Assume 95% voltage regulation efficiency. Find the range of ma based on the selected transformer. Find mf. Find L and C values of the output filter. Explain the reason why topology uses antiparallel diodes in the switches. Answers: n=5 ma-1-0.8239 mf=200 / L=795 uH C=31.862 uFWith base MVA of 150 and base voltage of 33. If the reactance of the transformer is 0.23 pu. The parameter of the reactance of the transformer in the Neplan software is O 1.66 2.30 23 0.23 O Non of them