Low-voltage-networks operate with a nominal voltage charged with a tolerance range. Consumer’s installations (CI) are feeded with different supply-voltages which depend on the location of the CI within the LV-grid and the load flow. At the feeding point of the CI no additional regulating device is foreseen. Local-Energy-Controllers can decrease the supply-voltage and influence the energy consumption of the CI. This paper shows when LECs operate properly and which preconditions have to be fulfilled for the energy-saving. Different consumer categories and the calculation algorithm for the amount of the energy saving will be introduced. At the end the algorithm will be compared with results of real LEC-installations. The properly engineered operation of an LEC saves energy, energy costs and reduce CO2, without affecting the power-quality negatively.
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