What is one of the functions of circuit breakers in a substation? 

Explanation:

Circuit breakers in a substation serve the crucial function of interrupting electrical circuits under abnormal conditions to protect the electrical system and connected equipment. Here's a brief explanation:

Interrupting Short-Circuits: In the event of a short circuit, where an unintended connection between conductors occurs, a high current flows through the circuit. Circuit breakers are designed to detect this excessive current and quickly interrupt the circuit to prevent damage to equipment and minimize the risk of electrical fires.

Interrupting Overload Currents: Circuit breakers also protect against overloads, which happen when the current in a circuit exceeds its designed capacity. Overloads can occur due to various reasons, such as increased load demand or a fault in the system. Circuit breakers are equipped to open the circuit when an overload is detected, preventing overheating and damage to the wiring and connected devices.

Switching Equipment Control: While not the primary function, circuit breakers are also used for the manual or automatic control of electrical circuits. They can be used to open or close circuits for maintenance, repair, or to control the flow of electricity in a controlled manner.

Voltage Regulation and Power Generation: These functions are typically not associated directly with circuit breakers. Voltage regulation is often managed by other devices like voltage regulators, and power generation is controlled by generators and associated control systems.

In summary, circuit breakers play a vital role in maintaining the safety and reliability of the electrical system by interrupting abnormal currents such as short-circuits and overloads. They act as protective devices to safeguard equipment and prevent potential hazards in a substation or any electrical installation.