Q2. 0 A 6.6KV Main Switch Board of a factory receive 6.6KV supply from Power Grid. The Contract Capacity is at 1500 kW. The table below shows the kWh meter readings of a typical day of the factory in a 24 hours period. Time Meter Reading Time Meter Reading (kWh) (kWh) 0:00 0 12:00 3800 0:30 0 12:30 4200 1:00 0 13:00 4600 1:30 0 13:30 5000 2:00 0 14:00 5400 2:30 0 14:30 6000 3:00 0 15:00 6600 3:30 0 15:30 7400 4:00 0 16:00 8200 4:30 0 16:30 8700 5:00 0 17:00 9200 5:30 0 17:30 9400 6:00 0 18:00 9600 6:30 0 18:30 9700 7:00 0 19:00 9800 7:30 50 19:30 9900 8:00 100 20:00 10000 8:30 150 20:30 10000 9:00 200 21:00 10000 9:30 600 21:30 10000 10:00 1000 22:00 10000 10:30 1600 22:30 10000 11:00 2200 23:00 10000 11:30 3000 24:00 10000 a) The power factor recorded is at 0.76 lagging. What is the Maximum Demand in 30 mins of the factory? (3 marks) b) Calculate the monthly utility bill (assume 30 day in month). The tariff of the utility company is, Peak Usage charge (7am to 11pm) 20 cents / kWh Off peak Usage charge (11pm to 7am) 12 cents / kWh Contracted Capacity Charge per month $8 / kW Uncontracted Capacity Charge per $11 / kW month Reactive Power Charge 0.6 cents / chargeable kVArh (5 marks) A main switch board is supplied from a 22/0.4 kV, 2,000 KVA transformer with an impedance of 6%. The impedance of LV cables to the main switchboard is 0.0005+jo.0012 2. The fault level at the intake point at 22 kV is 1,000 MVA, calculate the fault current at main switch board. (12 marks) Q2. 0 A 6.6KV Main Switch Board of a factory receive 6.6KV supply from Power Grid. The Contract Capacity is at 1500 kW. The table below shows the kWh meter readings of a typical day of the factory in a 24 hours period. Time Meter Reading Time Meter Reading (kWh) (kWh) 0:00 0 12:00 3800 0:30 0 12:30 4200 1:00 0 13:00 4600 1:30 0 13:30 5000 2:00 0 14:00 5400 2:30 0 14:30 6000 3:00 0 15:00 6600 3:30 0 15:30 7400 4:00 0 16:00 8200 4:30 0 16:30 8700 5:00 0 17:00 9200 5:30 0 17:30 9400 6:00 0 18:00 9600 6:30 0 18:30 9700 7:00 0 19:00 9800 7:30 50 19:30 9900 8:00 100 20:00 10000 8:30 150 20:30 10000 9:00 200 21:00 10000 9:30 600 21:30 10000 10:00 1000 22:00 10000 10:30 1600 22:30 10000 11:00 2200 23:00 10000 11:30 3000 24:00 10000 a) The power factor recorded is at 0.76 lagging. What is the Maximum Demand in 30 mins of the factory? (3 marks) b) Calculate the monthly utility bill (assume 30 day in month). The tariff of the utility company is, Peak Usage charge (7am to 11pm) 20 cents / kWh Off peak Usage charge (11pm to 7am) 12 cents / kWh Contracted Capacity Charge per month $8 / kW Uncontracted Capacity Charge per $11 / kW month Reactive Power Charge 0.6 cents / chargeable kVArh (5 marks) A main switch board is supplied from a 22/0.4 kV, 2,000 KVA transformer with an impedance of 6%. The impedance of LV cables to the main switchboard is 0.0005+jo.0012 2. The fault level at the intake point at 22 kV is 1,000 MVA, calculate the fault current at main switch board. (12 marks)