Question

The per unit parameters for a 1000MVA machine on its own base are
M=40 pu and H=5pu.
The per unit values of M and H on 100 MVA base are

• A. 4pu, 50 pu
• B. 40 pu, 5pu
• C. 40pu, 50 pu
• D. 400 pu, 50pu

Answer 1

The correct option is A 4pu, 50 pu

M $\alpha$ S

$\frac{M_1}{M_2}=\frac{S_1}{S_2}$

$\frac{40}{M}=\frac{1000}{100}$

M = 4 pu

$H\alpha \frac{1}{S}$

$\frac{H_1}{H_2}=\frac{S_2}{S_1}$

$\frac{5}{H}=\frac{100}{1000}$

H = 50 pu