1256 Perspective

Up to this point, several issues concerning DG have been presented. It is necessary to understand the various aspects of these issues if a safe and acceptable operating environment is to be achieved. There are two governing codes that will come to bear on this environment: the National Electrical Code (NEC), NFPA 70, and the National Electrical Safety Code (NESC), IEEE/C2. The first of these defines the requirements for a safe and acceptable power system in a facility. The second defines the requirements for a safe and acceptable utility distribution system.

The purpose of these codes is twofold. The first consideration is personnel safety. The second consideration is property safety. From the personnel safety aspect, the installed circuit must provide assurance to any personnel that a circuit can be isolated and locked out to make it safe to work on. This is required on both sides of the point of connection, the grid and the facility. This is also an OSHA requirement. From the property safety aspect, the installed facilities must curtail the environment for creating a fire.

In designing the DG environment, the circuits on both sides of the point of common connection must be protected in accordance with the respective code, the equipment must be protected from the undesirable effects of operation, an economical operating strategy must be achieved, and risk must be curtailed. The host facility of the DG unit is likely not in the electric power generation business. In the case of coincidental use of installed units (emergency and standby power systems), those units exist to mitigate the impact of power outages. That they can be used for DG allows a return on the sunken capital by curtailing the facility operating cost of electricity. In the case of generation installed specifically for the DG environment, the equipment investment must be configured to provide the maximum return on invested capital.*

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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