A delivery system’s primary mission is to deliver electric power to the consumers at their place of consumption and in read-to-use form. The system must deliver power to the customers, which means it must be dispersed throughout the utility franchise in uneven proportions.
There are a bulk of customers in central downtown area of a city but are scattered as it goes to the outskirts. The primary requirement for the power delivery system is to reach every customer through an electrical path, sufficient enough to satisfy the customer’s demand.
The electrical path reaching the customers is not enough; it must be a reliable one. A reliable path provides an uninterrupted flow of power to the customers. A reliable delivery system delivers all of the power demanded, not just a part of what is needed, in a sustained manner. A 99.9% reliability of service means nearly 9 hours of electric service interruption each year, in percentage it’s impressive but the truth it is not. And it is unacceptable to nearly all first world countries.
Aside from providing the customers with highly reliable power, the delivery system must also make sure that the delivered power is of acceptable quality. Mostly, the quality of the power delivered can be measured through the state of the voltage of the electricity being delivered. Delivery voltage range is about ten percent of the utilization voltage. Voltage fluctuations have different and mostly damaging effect on the appliances thus a ten percent voltage fluctuation from the utilization voltage is unacceptable. If the fluctuation is too great or happens too often, then it is a sign of poor quality.
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