A 15 MW thermal power station has the following data: Cost of plant = $150 per kVA
Interest, taxes, insurance and depreciation rates = 25%
Cost of 11 kV-primary distribution system = $50000
Interest, taxes, insurance and depreciation rates = 10%
Annual fuel costs = $4×105
Annual operation costs = $20000
Annual plant (fixed) maintenance costs = $10000
Annual plant (variable) maintenance costs = $15000
Maximum demand = 10 MW
Annual load factor = 50%
Power factor at generating power station terminals = 0.85 lagging
Determine the electrical supply tariff per unit at the consumers'
terminals, where:
- Plant reserve power is 10% over maximum generated power
demand.
- Efficiency of primary distribution system is 97%.
Find the percentage saving in electrical supply tariff served for the
consumers, if the load factor is raised to 75%.