Hello, our today’s topic is about the discussion on different types of electrical networks. Electrical networks can be categories as (1) Transmission networks (2) Sub-transmission networks (3) Medium Voltage networks and (4) Low Voltage networks.

Transmission Networks: These networks take electrical power from the step-up transformer present at the generating station. Power is generated at the level of up to 20kV, however, it is step-up using the transformer to a level up to 400kV. This is done to keep the power losses low while transmitting the power across geographies. Most common voltage levels in this network are 220kV and 400kV, however, can go up to a level of 1000kV in some countries.

Sub-transmission Network: These networks take electrical power from the Transmission Network and operate at the level of up to 132kV. These networks transmit power at distances smaller than the Transmission Networks and also supply power to “bulk consumers”. These consumers consume high amount of power and have their own HV substations. Example of these consumers are cement plants, oil refineries, air ports etc. Most common voltage levels in this network is 66kV and 132kV.

Medium Voltage Network: These network provide power distribution in the residential areas or to the small industrial consumers. These networks are up to the level of 40kV, however, most common voltage level is 11kV.

Low Voltage Network: These network provide power to the residential consumers. Most common voltage levels are from 380V to 420V.

It is important to mention that these voltage levels are dependent on the country local regulations and the geographical area.

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