Question

Can you help me calculating this question? Thank you.

Can you calculate this working and explain why? Thank you! 1. A 50-Hz 10-MVA, 66/22-kV distribution transformer has a full-load efficiency of 98% at 0.8 lagging power factor. The transformer core loss is 80 kW. The transformer supplies an industrial load that has a constant demand of 5000 kW at 0.65 lagging power factor. The cost of energy is S0.1 per kWh. In the following questions, assume that the voltage at the load terminal is maintained constant at 22 kV. State any other assumptions made in your calculations Calculate the capacitor rating (in kVAr) to improve the power factor at the load terminal to 0.95 lagging. Also, determine the reduction in the average power loss of the transformer and the saving in energy costs per year when the capacitor is in service. Assume that one year has 365 days EE4534 (b) Suppose the transformer has a 20% continuous overloading capa Determine the additional load (in kW and k bility VAr) that can be supplied through the transformer following the installation of the capacitor if the additional load absorbs power at 0.8 lagging power factor (10 Marks) (c) Wha t is load shedding? Briefly discuss what are the factors to consider in load shedding

Answer 1

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The hel load MVA abig 6the transfo 2 0、98 Full innd copper los- 83 265Kuw by the antonmer 500okw at 0 65 pf lagging catacm): 526 3.eskVA So KVA9 atnga nerolo adatten addit en nero 1643、収KVAr x/new KVA nabia full load kVA Total loss abte 2 addirg amihm-= Ru+fcore-(23-065+80) kw censtamt Total lds betone adding catador: 80KWtRAld-8)+492-9 capaulDr 二129.269 KW 49.269 kW Reductiern n losses: 1,29-269-103.065ะโ26-20-kw

Q255489 So 254. 39 bawed by adding the capastios 20% overloading 5263- 158x0 2 aliir So the hamsjonmes can withstand am こ 163157 8kVAY