Give the raceway size required for each of the following conductor combinations: 1. Five, 10 AWG, Type THW in Schedule 80 PVC 2. Three, 1/0 AWG, Type THHN in EMT. 3. Three, 1/0 AWG and one, 1 AWG, Type THW in EMT
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- 3. What are the classifications of Core Loss and Copper Loss?13.a. Eddy-current loss in the stator core can be reduced by usingA. alloys with low resistivity.B. annealed iron laminations.C. silicon alloys of copper.D. thin laminations of steel.13.b. Which one of the following is damaging to many insulating materials used in alternators?A. Eddy currentsB. SaturationC. CoronaD. HysteresisWhy Kelvin bridge is used for measurement of low resistance ____________________. a. due to a large current flow b. due to power dissipation across the circuit c. due to contact and lead resistance d. due to emf source used
- Combination circuit what is PT? RT? IT? Voltage Across each load?Discuss causes of insulation failures in high voltage engineering. High voltage engineeringh.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.
- Single core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The maximum Electric stress of the cable isAnswer 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?In an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 13kV and that across the next unit is 12KV. Estimate: 17. i. ratio of mutual to self-capacitance ii. the bus-bar voltage of the substation. iii. Efficiency across the string of insulators