Which one of the following statements is correct?.
The elements of each row of a 
matrix for load flow
studies in power
system add up to zero.
Always
If the shunt admittances at the buses are ignored
If mutual couplings between
transmission lines are absent
If both (b) and (c) are satisfied
If both (b) and (c) are satisfied
Elements of each row of a 
matrix for a load flow
studies in power system add upto zero only when
1.The
shunt admittance at the buses are ignored.
2. Mutual
couplings between transmission lines are absent.
Hence, the correct option is (D).
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