13 April 2019

Standard Alternating Voltage And Permissible Voltage Limit

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.
You may also like :

No comments:

Post a Comment