Step voltage down to consumers through feeders and substations.
Primary distribution (6–33 kV) feeds substations and distribution transformers to low-voltage consumers. Radial feeders are simple; rings and meshes improve reliability. Voltage drop, protection coordination and losses guide design.
A rural feeder may be radial; a city centre often a looped network.
Distribution networks deliver power to homes and businesses, so their voltage drop, protection and reliability affect every customer.
Step voltage down to consumers through feeders and substations.
Distribution networks deliver power to homes and businesses, so their voltage drop, protection and reliability affect every customer.
A line that carries power from a substation to a group of loads, usually at medium voltage.
Customers at the end of long feeders can see low voltage, which affects equipment performance and may breach regulation limits.
Typical applications include designing a feeder that keeps voltage within limits for the last customer, planning the substations that step voltage down to 415 V and sizing transformers for a new housing estate.
Study "Line parameters" first (topic 69 of 106 in Electrical Engineering). It covers the groundwork this topic builds on.
SAIDI and SAIFI reliability indices. Automatic reclosers. Underground vs overhead.
A rural feeder may be radial; a city centre often a looped network.
The next topic is "Load flow analysis", which builds directly on this one.
It is classed as Intermediate in Electrical Engineering (topic 70 of 106). It is an intermediate topic. Work through the beginner topics in Electrical Engineering first.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.