To ensure that the energy generated is used exclusively by the self-consumer’s loads and that the plant does not feed energy into the Grid (“zero feed-in”), the following arrangement may be implemented: a “directional sensor” (“energy flow direction sensor” or “smart energy meter”) is installed at the installation’s incoming supply. It may be single-phase or three-phase, with or without measuring transformers, as applicable.
The installation and proper operation of the sensor (S) are the self-consumer’s responsibility. When increased generation and/or a reduced load results in surplus energy that is about to flow from the electrical installation into the Grid, the plant receives a signal from the sensor to reduce or stop its generation so that no energy is fed into the Grid (Figure 3). Equivalent solutions may be accepted, provided they demonstrate and ensure that the installation does not feed energy into the Grid.
The installation and proper operation of the sensor (S) are the self-consumer’s responsibility. When increased generation and/or a reduced load results in surplus energy that is about to flow from the electrical installation into the Grid, the plant receives a signal from the sensor to reduce or stop its generation so that no energy is fed into the Grid (Figure 3). Equivalent solutions may be accepted, provided they demonstrate and ensure that the installation does not feed energy into the Grid.
The “zero feed-in” arrangement makes it possible to connect a generating plant to a saturated network, provided the saturation is due to the rated power of the Grid components being exceeded or the desired voltage limits at Grid nodes being exceeded.
If the Grid has been designated as saturated because the short-circuit level at the MV busbar of the upstream HV/MV transformer has been exceeded, implementing the “zero feed-in” arrangement does not make it possible to connect the generating plant.
If the Grid has been designated as saturated because the short-circuit level at the MV busbar of the upstream HV/MV transformer has been exceeded, implementing the “zero feed-in” arrangement does not make it possible to connect the generating plant.