1) Calculate the output of second alternator
2) Calculate the value of power factor of second alternator
If you are noticing some error in problems kindly comment below.Thanks
Given
MVAtotal = 15 MVA
Φtotal = 0.8 ; sin Φtotal = 0.6
For Alternator 1
MVA1 = 8 MVA
Φ1 = 0.9 ; SinΦ1 = 0.436
To find
1. MVA2
2. Φ2
Solution
Total load MWtotal = MVAtotal x cos Φtotal
= 15 x 0.8
= 12 MW
Total Reactive load MVARtotal = MVAtotal x sin Φtotal
= 15 x 0.6
= 9 MVA
Alternator 1 load MW1 = MVA1 x cos Φ1
= 8 x 0.9
= 7.2 MW
Alternator 1 Reactive load MVAR1 = MVA1 x sin Φ1
= 8 x 0.436
= 3.49 MVAR
For Alternator 2 Load MW2 = MWtotal - MW1
= 12 - 7.2
= 4.8 MW
Alternator 2 Reactive load MVAR2 = MVARtotal - MVAR1
= 9 - 3.49
= 5.51 MVAR
1. MVA22 = MW22 + MVAR22
MVA2 = Square root of (MW2 + MVAR2)
= Square root of (4.82 + 5.512)
MVA2 = 7.3 MVA
2. Cos Φ2 = MW2 / MVA2
= 4.8 / 7.3
Cos Φ2 = 0.66 (lag)
0 comments:
Post a Comment