What is the function of a protective relay in relation to CTs and VTs?

The function of a protective relay in relation to current transformers (CTs) and voltage transformers (VTs) is to provide isolation from high currents or voltages. Protective relays are essential components in electrical systems that monitor electrical parameters and ensure the safety and stability of the system. When a fault occurs, such as a short circuit or an overload, the relay detects the abnormal conditions through the signals from CTs and VTs.

By isolating the faulty section of the system, the protective relay helps prevent further damage to equipment and enhances safety for operational personnel. This isolation is crucial, particularly when dealing with high voltages or currents, as it protects the downstream equipment and personnel from hazardous conditions. The protective relay ensures that the electrical network can continue to operate safely and efficiently by swiftly disconnecting faulty sections.

In contrast, while the other options involve essential functions within electrical systems, they do not specifically pertain to the role of protective relays in their interaction with CTs and VTs.