Subterranean cable systems equipped with distribution transformers and switchgear, situated in underground vaults or ground-level cabinets, cater to high-density loads in metropolitan environments.
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The primary purpose of secondary distribution is to deliver electricity directly to consumers. By reducing voltage levels, it ensures safe and efficient power usage for homes, offices, and small industries. Let's make an example for clarity: A newly constructed residential area introduces a 10kV power line to a substation. The transition from transmission to distribution happens in a power substation, which has the following functions: Circuit breakers and switches enable the substation to be disconnected from the transmission grid or for distribution lines to be disconnected.
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This configuration is called a radial system and is common for low-density rural areas where more complex systems are cost prohibitive.
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Overhead laterals use pole-mounted distribution transformers to serve customers and underground laterals use pad mount transformers.
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Radial operation is the most widespread and most economic design of both MV and LV networks. It provides a sufficiently high degree of reliability and service continuity for most customers.
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