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Annexure - Checklists & Tips

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ANNEXURE CHECKLIST & TIPS FOR ENERGY EFFICIENCY IN ELECTRICAL UTILITIES Electricity Optimise the tariff structure with utility supplier Schedule your operations to maintain a high load factor Shift loads to off-peak times if possible. Minimise maximum demand by tripping loads through a demand controller Stagger start-up times for equipment with large starting currents to minimize load peaking. Use standby electric generation equipment for on-peak high load periods. Correct power factor to at least 0.90 under rated load conditions. Relocate transformers close to main loads. Set transformer taps to optimum settings. Disconnect primary power to transformers that do not serve any active loads Consider on-site electric generation or cogeneration. Export power to grid if you have any surplus in your captive generation Check utility electric meter with your own meter. Shut off unnecessary computers, printers, and copiers at night. Motors Properly size to the load for optimum efficiency. (High efficiency motors offer of 4 - 5% higher efficiency than standard motors) Use energy-efficient motors where economical. Use synchronous motors to improve power factor. Check alignment. Provide proper ventilation (For every 10oC increase in motor operating temperature over recommended peak, the motor life is estimated to be halved) Check for under-voltage and over-voltage conditions. Balance the three-phase power supply. (An Imbalanced voltage can reduce 3 - 5% in motor input power) Demand efficiency restoration after motor rewinding. (If rewinding is not done properly, the efficiency can be reduced by 5 - 8%) Drives Use variable-speed drives for large variable loads. Use high-efficiency gear sets. Use precision alignment. Check belt tension regularly. Eliminate variable-pitch pulleys. Use flat belts as alternatives to v-belts. Bureau of Energy Efficiency 190

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