Power system consists of generating units, transmission system and distribution system. Generating voltages may have 6.6KV, 3.3KV, 11KV, 21KV or 31KV. The amount of voltage generating depends on the insulation withstand level of the generator. Transmission system is required to deliver bulk amount of power from power stations to load centers. The primary transmission voltages are 110KV, 132KV, 220KV and 400KV.
These transmission voltages are designed based on the distance to which power is to be delivered, amount of power to be transmitted and the system stability. Secondary transmission voltages are of the order of 11KV or 33KV. The role of distribution station is to deliver power from substation to the consumer terminals. The Voltages of the primary distribution are 11, 6.6, or 3.3KV connected to bulk consumers (Industries). Secondary distribution voltage constitutes 415 or 230V.
These transmission voltages are designed based on the distance to which power is to be delivered, amount of power to be transmitted and the system stability. Secondary transmission voltages are of the order of 11KV or 33KV. The role of distribution station is to deliver power from substation to the consumer terminals. The Voltages of the primary distribution are 11, 6.6, or 3.3KV connected to bulk consumers (Industries). Secondary distribution voltage constitutes 415 or 230V.
For transmitting large blocks of power 3-phase 3-wire is used for transmission and for distribution of electrical power 3-phase 4-wire is used.
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