What does a capacitor in series do in a circuit?

What does a capacitor in series do in a circuit?

The main functions are the following 5, which are analyzed and introduced in detail by the capacitor manufacturer .

(1) Increase the voltage at the end of the line. The capacitor connected in series in the line uses its capacitive reactance to compensate the inductive reactance of the line, so as to reduce the voltage drop of the line, thereby increasing the voltage at the end of the line (the power receiving end), generally, the voltage at the end of the line can be increased by 10% to 20% .

(2) Reduce the voltage fluctuation of the receiving terminal. When the power receiving end of the line has a large change in impact load (such as electric arc furnace, electric welding machine, electric rail, etc.), the series capacitor can eliminate the violent fluctuation of the voltage. This is because the compensation effect of the series capacitor on the voltage drop in the line changes with the load passing through the capacitor, and it has the performance of instantaneous adjustment with the change of the load, and can automatically maintain the voltage value of the load end (power receiving end).

(3) Improve the power transmission capacity of the line. Since the compensation reactance of the capacitor is inserted into the line in series, the voltage drop and power loss of the line are reduced, and the transmission capacity of the line is correspondingly improved.

(4) The system power flow distribution is improved. Some capacitors are connected in series on some lines in the closed network, which partially changes the line reactance, so that the current flows according to the specified line, so as to achieve the purpose of power economical distribution.

(5) Improve the stability of the system. After the line is connected in series with the capacitor, the transmission capacity of the line is improved, which itself improves the static stability of the system. When the line fault is partially cut off (for example, the double circuit is cut off once, but the single-phase grounding circuit is cut off for one phase), the equivalent reactance of the system increases sharply. , the number of parallel connections, temporarily increase the capacitive reactance, so that the total equivalent reactance of the system is reduced, the limit power of the transmission is increased, and the dynamic stability of the system is improved.