Charging Current in Transmission Line

In other words, the current associated with the line capacitance is defined as the charging current. The magnitude of charging current depends on the line voltage, frequency, and capacitance, as described by the following equations. For a single-phase line, the charging current

Where, C= line-to-line in farads，Xc= capacitive reactance in ohms，V= line voltage in volts.

In addition, the reactive power volt-ampere value generated by the line is equal to the charging volt-ampere value of the line.

For a three phase line, the charging current phase

where V_n =voltage to neutral in volts = phase voltages in volts，C_n = capacitance to neutral in farads

Reactive volt-ampere generated by the line = charging volt-amperes of the lines

• Reduces load current, thereby decreasing line losses and improving transmission efficiency.
• Improves the power factor of the transmission line.
• Enhances the load-carrying capacity of the line.
• Improves voltage regulation due to minimal voltage drop.