Function of the system when electricity is used as the power source

The measuring period for the supply with electrical power is normally 15 or 30 minutes. During this time the averaged power received at the hand-over point - from here on it is referred to as power or load - resp. the equivalent amount of energy is determined and recorded.

The price is usually fitted to the three highest values which accrued for the measuring periods in different months. The price is then valid on the long term.

The average power which is used to calculate the price can be reduced when corresponding peak power consumptions are limited due to pointedly controlled interventions. This short term optimization can be achieved by the following interventions:

Load shedding at switchable devices
Increasing input of own generators

The aim of this optimization is to not exceed the contractual set limit for the power in a measuring period under no circumstances. The power consumption should also be only a little bit under the set limit in order to receive maximum power.

The optimization is done using a trend calculation as a short term prediction. The measured values which were gathered during the handling interval (typically 30, 60 or 180 seconds) are used to perform a trend analysis. The calculated trend is projected to the end of the period.