66 For which environmental factor(s) can the expected dc current of a PV array be accurately calculated using the module nameplate current value? A Irradiance Irradiance and temperature Change in temperature D Wind speed
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- What are the types of Converter Topologies in PV System?An RLC series circuit connected to a 110 – volt and 50 – cycle AC source, contains the following series resistances and reactances: R1 = 10 ohm, R2 = 15, R3 = 5 ohms, XL1 = 20 ohms, XL2 = 25 ohms, XC = 40 ohms. Find the following: a.) EQUIVALENT REACTANCE b.) TOTAL IMPEDANCE c.) VOLTAGE DROP ACROSS THE CAPACITOR d.) TOTAL INDUCTANCE IN MILLIHENRY e.) TOTAL CURRENT f.) REACTIVE POWER g.) REAL POWER DRAW THE PHASOR DIAGRAM IF POSSIBLE AND ROUND OFF TO FOUR DECIMAL PLACESA series resistance – capacitance (R – C) circuit is connected to 230 – volt, 50 cycle AC source. The current through the resistor is 45.45 A and the power taken by the circuit is 5,000 watts. Compute the following: 1.) Power factor angle 2.) Circuit impedance 3.) Ohmic value of the resistor
- Answer all the questions 1. Draw a 6-stage cascaded voltage multiplier circuit for high voltage DC generation and explain the working principle. 2. Compare the properties of Solid insulators and liquid dielectrics? 3. Define Basic Insulation Level (BIL) in power systems and Explain the voltage - time relationship with the curve in insulation coordination. 4. What are the three protective methods for surges, explain one method. 5. What are the different types of surge diverters and explain any two methods? 6. A 12-stage impulse voltage generator has a total generator capacitance of C1. The wave front resistance equal to 15000 2 and load capacitance of 2500pF. The wave tail resistance is 30 times of wave front resistance and if rise time is 1.5 µs. Calculate (i) the value of each capacitor of the generator and (ii) the tail time of the impulse wave?Consider Two same size Parallel connected PV modules,each with the specification as Po=100W, Voc= 24.5V and Isc=5A.then choose the correct Statement Refer to this connection. a. The output power and voltage from this panel is Po=50W,Voc= 24.5V b. The output power and voltagefrom this panel is Po=200W,Voc= 24.5V c. The output power and voltage from this panel is Po=200W,Voc= 49.0V d. The output power and voltage from this panel is Po=100W,Voc= 24.5V(5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.
- How to generate 480V three phase 400Hz ac from 230V three phase 60Hz ac source? (Please specify the power components you pick, such as transformers, dc-dc converter, dc-ac converter and/or ac-dc converter, how these components are connected and the key parameters of these components, such as the turns ratio of transformer and the duty cycle functions for the converters.)Discuss causes of insulation failures in high voltage engineering. High voltage engineeringThe single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 %3D degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)
- A 200 – ohm resistor, 130 millihenry inductor, and a 66 microfarad are placed in parallel across a 120 – V, 60 – Hz AC line. Calculate the following: a.) RESISTOR CURRENT b.) INDUCTOR CURRENT c.) CAPACITOR CURRENT d.) TOTAL CURRENT e.) PHASE ANGLE f.) TOTAL IMPEDANCE DRAW THE PHASOR DIAGRAM IF POSSIBLE AND ROUND OFF TO FOUR DECIMAL PLACES.Explain the concept of power quality in electrical systems and the potential issues that can arise, such as voltage sags, harmonics, and flicker.(b) A symmetrical three-wire three-phase supply as shown in Figure Q2(b) is connected to a balanced three-phase load. The value of impedance, Z is identified to be 100-j75 Q. (i) Find IaB, IBC and ICa (ii) Determine Iaa, IbB and Ic (iii) Determine Iba, Isb and Ix (iv) Draw the phasor diagram of all currents in Q(b)(i) and Q(b)(ii)