What feature do capacitors for use on electrical lines have?

Capacitors used on electrical lines are equipped with an internal-discharge resistor to ensure safety and proper functioning. The primary purpose of this resistor is to provide a path for the discharge of the stored electrical energy in the capacitor after it has been disconnected from the circuit. This is crucial because capacitors can hold a charge that poses a risk of electric shock or equipment damage if not properly discharged.

When a capacitor is disconnected, it can still retain a significant voltage for a long period, which can be hazardous for maintenance personnel or affect subsequent operations. The internal-discharge resistor allows the charge to dissipate safely and quickly, typically within a few minutes, reducing the risk of accidental electric shock and ensuring that the device is safe for handling.

This feature is particularly important in high-voltage applications common in electrical lines, where safety standards mandate that components are designed to minimize hazards. By incorporating an internal-discharge resistor, capacitors ensure a manageable and predictable discharge of electrical energy, enhancing safety for users and maintenance workers.