Increasing the limit of distance of a transmission line is a crucial aspect in electrical engineering. It allows for the efficient and reliable transmission of power over long distances. One way to achieve this is by using series capacitors and shunt reactors.

Series Capacitors:
- Series capacitors are used to compensate for the inductive reactance of the transmission line. The inductive reactance tends to limit the transmission line's ability to carry power over long distances.
- By introducing series capacitors, the reactive power compensation is improved, reducing the overall inductive reactance of the line.
- This helps to increase the voltage at the receiving end of the transmission line, allowing for the transmission of power over longer distances.
- Series capacitors also help to improve the power factor of the transmission line, reducing the losses and increasing the overall efficiency.

Shunt Reactors:
- Shunt reactors are used to compensate for the capacitive reactance of the transmission line. The capacitive reactance can cause voltage instability and voltage rise issues.
- By introducing shunt reactors, the capacitive reactance is compensated, allowing for better voltage control and stability.
- Shunt reactors also help to limit the voltage rise in the transmission line, especially during light load or no-load conditions.
- By maintaining a stable voltage profile, the transmission line can transmit power over longer distances without significant voltage drop or instability.

Combined Effect:
- By using a combination of series capacitors and shunt reactors, the overall reactance of the transmission line can be optimized.
- Series capacitors reduce the inductive reactance, while shunt reactors compensate for the capacitive reactance.
- This combination helps to improve the power transfer capability of the transmission line, allowing for the transmission of power over longer distances.
- By reducing reactance, the line losses are minimized, and the overall efficiency of the transmission system is improved.

In conclusion, the use of series capacitors and shunt reactors is essential for increasing the limit of distance of a transmission line. These devices help to compensate for the reactive power and maintain a stable voltage profile, enabling the efficient transmission of power over long distances.