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Disadvantage with series compensation
Reduce the stability
increase the voltage drop
Reduce the power factor
Increase in fault current
Increase in fault current
Quick Trick: Series compensation adds a capacitor to the line, which lowers total reactance (XtotalтАЛ = XlineтАЛ - XcapтАЛ); lower impedance during a fault leads to a spike in current.
Series compensation adds a capacitor to the line, which lowers total reactance (XtotalтАЛ = XlineтАЛ - XcapтАЛ); lower impedance during a fault leads to a spike in current.
Analyze Series Compensation impact on Impedance
Series compensation is the addition of a series capacitor to a transmission line. This reduces the overall line inductive reactance (X = XLтАЛ - XCтАЛ).
Link Impedance to Fault Current
Fault current is given by IfтАЛ = V / Z. Since Z (impedance) decreases significantly due to the capacitor, the fault current IfтАЛ increases proportionally.
A: Series compensation actually improves steady-state stability. B: Series compensation reduces, not increases, the voltage drop. C: Series compensation improves power factor by neutralizing inductive reactance.
D is correct because reducing the line's net impedance via series capacitance causes a significant increase in current flow during short-circuit faults.
Always remember that anything reducing transmission line impedance to improve flow also makes the system more sensitive to surge currents during faults.