1112Load Characteristics

Depending on the needs of the customer, the voltage supplied can be as low as 120 V single-phase or 120/240 V single-phase, where the 240 V secondary of the distribution transformer has a center tap that also provides two 120 V single-phase circuits. Larger customers may utilize three-phase power, with 120/208 or 277/480 V service.* Very large, industrial customers, for example, can include higher three-phase voltages, such as 2400 V, 4160 V, or greater (see above). Depending on the voltage at which it acquires power, the customer is usually responsible for providing the transformers and other infrastructure to serve all of the lower voltage requirements needed by its facility or site.

A typical service transformer (ground mounted or pole mounted), supplying five to ten residences, converts the three-phase power at a distribution voltage of 13.8 kV (transformer primary), for example, to power at 120/240 V. Each of the 240V, single-phase transformer secondaries has a center tap that provides two 120 V single-phase circuits. Therefore, an individual residence can be supplied with both 120 and 240 V single-phase service. The higher voltage is necessary for appliances such as clothes dryers.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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