SoP 011 - A : System Average Interrruption Frequency Index (SAIFI) for JGY cagegory
4th  Quarter Year - 2008-09
Sr.
No
Month Ni - Number of Customers for each sustained interruptions (in numbers) NT - Total No of customers served
(in Numbers)
SAIFI = Ni/Nt
(Monthly SAIFI)
1 2 3 4 5= 3 / 4
1 Apr-08 1982869.1 1130771 1.75
2 May-08 1926492 1121529 1.72
3 Jun-08 2133499 1124474 1.90
SoP 011 - B : System Average Interrruption Duration Index (SAIDI)  for JGY cagegory
4th  Quarter Year - 2008-09
Sr.
No
Month Ri =
Restoration Time for each sustained interruption event
(in hours)
Ni - Number of interrupted Customers for each sustained interruption event
(in numbers)
Ri* Ni -
Total customer interrution Duration
NT - Total No of customers served
(in Numbers)
SAIDI = Ri*Ni/Nt
(Monthly SAIDI)
1 2 3 4 5 = 3 * 4 6 7= 5 / 6
1 Apr-08 1427.89 1684 2404080.69 1130771 2.13
2 May-08 1942.04 1477 2867657.63 1121529 2.56
3 Jun-08 2356.45 1138 2682531.43 1124474 2.39
SoP 011 - C : Momentary Average Interruption Frequency Index (MAIFI)  for JGY cagegory
4th  Quarter Year - 2008-09
Sr.
No
Month IMi =
Number of Momentary interruptions for the month
(in numbers)
Nmi =
Total no of customers for each momentary interruptions
(in numbers)
Imi =Nmi
Number of customer Mementary interruptions
(in numbers)
Nt -
Total no of customers served
(in numbers)
MAIFI=
Imi*Nmi/
Nt
1 2 3 4 5 = 3 * 4 6 7= 5 / 6
1 Apr-08 8485 1672 14187387 1130771 12.55
2 May-08 7621 1677 12777266 1121529 11.39
3 Jun-08 8613 1683 14491644 1124474 12.89