Choice of power-supply sources - Electrical Installation Guide

http://www.electrical-installation.org/enwiki/Choice_of_power-supply_sources[7/23/2013 10:20:03 AM]

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General rules of electrical installationdesign

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Connection to the MV utility distributionnetwork

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Choice of power-supply sources

The importance of maintaining a continuous supply raises the question of the use of standby-power plant. The choice andcharacteristics of these alternative sources are part of the architecture selection, as described in chapter D.For the main source of supply the choice is generally between a connection to the MV or the LV network of the power-supply utility.In practice, connection to a MV source may be necessary where the load exceeds (or is planned eventually to exceed) acertain level - generally of the order of 250 kVA, or if the quality of service required is greater than that normally availablefrom a LV network.Moreover, if the installation is likely to cause disturbance to neighbouring consumers, when connected to a LV network, thesupply authorities may propose a MV service.Supplies at MV can have certain advantages: in fact, a MV consumer:

Is not disturbed by other consumers, which could be the case at LVIs free to choose any type of LV earthing systemHas a wider choice of economic tariffsCan accept very large increases in load

It should be noted, however, that:

The consumer is the owner of the MV/LV substation and, in some countries, he must build and equip it at his ownexpense. The power utility can, in certain circumstances, participate in the investment, at the level of the MV line forexampleA part of the connection costs can, for instance, often be recovered if a second consumer is connected to the MV linewithin a certain time following the original consumer’s own connectionThe consumer has access only to the LV part of the installation, access to the MV part being reserved to the utilitypersonnel (meter reading, operations, etc.). However, in certain countries, the MV protective circuit-breaker (or fusedload-break switch) can be operated by the consumerThe type and location of the substation are agreed between the consumer and the utility

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Choice of power-supply sources - Electrical Installation Guide

http://www.electrical-installation.org/enwiki/Choice_of_power-supply_sources[7/23/2013 10:20:03 AM]

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Category: Chapter - General rules of electrical installation design