Standard Alternating Voltage in India

The standard voltage ( in India ) for low and medium line distribution was 230 V for single phase and 230 / 400 V for three phase system but due to economic advantage IEC recommended 240 V for single phase and 240 / 415 V for three phase system voltage with ± 6% voltage variation. 

• The IEC decided ± 10% voltage variation allowed for 240 V for single phase and 240 / 415 V for three phase system voltage in the year 2009.
•  The 110 kV is not standard transmission voltage but it is included due to sake of equipment which are already used for 110 kV. 
• The standard DC distribution voltage is 220 / 440 V.

Standard Alternating voltage Line to Line

• 240 V ( Line to Neutral )
• 415 V
• 3.3 kV
• 11 kV
• 22 kV
• 33 kV
• 66 kV
• 110 kV
• 132 kV
• 220 kV
• 400 kV

Voltage Variations Limits

• 10% for low voltage
• 6% for higher side and 9% on lower side in the high voltage transmission
• 12.5% for extra high voltage transmission

The system voltage with lowest voltage and highest voltage is summarized as below.

System voltage	Lowest voltage	Highest voltage
240 V	216 V	264 V
415 V	374 V	457 V
3.3 kV	3.0 kV	3.6 kV
6.6 kV	6.0 kV	7.2 kV
11 kV	10 kV	12 kV
22 kV	20 kV	24 kV
33 kV	30 kV	36 kV
66 kV	60 kV	72.5 kV
132 kV	120 kV	145 kV
220 kV	200 kV	245 kV
440 kV	380 kV	420 kV

These voltage variations have no concerned with permissible voltage variations.

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