Substation Idf Installation Guide
Contents. Large consumers of electricity are always fed by a medium voltage supply. On LV systems operating at 120/208 V (3-phases 4-wires), a load of 50 kVA may be considered as 'large', while on a 240/415 V (3-phases 4-wires) system this limit is generally above 100 kVA. These two systems of LV distribution are widely used in most of the parts of the world.
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Substation Idf Installation Guidelines
See also The IEC recommends a 'world' standard low voltage system of 230/400 V for 3-phases 4-wires. This is a compromise which will allow the existing systems operated at either 220/380 V or 240/415 V, or close to these values, to comply simply with the proposed standard by just adjusting the off load tap changers of the MV/LV distribution transformers. Ford taurus repair manual pdf.
The choice of the most appropriate level of supply of a new electrical installation is under the responsibility of the utility operating the network to which the installation is supposed to be connected. The decision is mainly based on two criteria:. The distance to the primary substation that will feed the installation. The total power required by the installation. Other criteria such as the rate of availability of the electricity supply are also taken into account. There are two possibilities for the construction of a substation dedicated to the supply of a new electrical installation: 1 - The utility builds the substation according to its own specifications, close to the consumer’s premises. The MV/LV transformer(s) however, remain located inside the installation, close to the loads.
Depending on local rules the MV/LV transformer(s) may belong or not to the utility, they may be installed or not by the owner of the installation, the utility has or not unrestricted access to their locations 2 - The owner of the electrical installation builds and equips the substation inside his premises. In most of the cases the utility must at least have unrestricted access to the metering and to the part of the substation ensuring the connection of the installation to the MV utility network. The utility may require a separate room for the equipment dedicated to these two functions.
The following chapters only refer to the construction of the substation by the owner of the electrical installation. Preliminary information In most of the cases the project of the construction of a new substation must be submitted before any further detailed studies to the approval of the utility operating the MV network that will feed the substation. The list of information to provide for this approval may be the result of preliminary discussions with the utility. Among all information, the following are generally required: Maximum anticipated power (kVA) demand The method of evaluation of this parameter is detailed in section, it must take into account the future additional loads. As described there, two factors associated to the loads are used in the proposed method:. The factor of maximum utilization (ku).
The diversity factor (ks).