The primary function of an HV Insulation Fault Relay is to continuously monitor the insulation resistance of high voltage equipment, such as transformers, circuit breakers, and overhead lines. Insulation failure can lead to catastrophic events, including equipment damage, outages, and even dangerous electrical hazards. Therefore, it is vital to detect insulation failures as early as possible to mitigate potential risks.

    Working Principle

    The operation of an HV Insulation Fault Relay revolves around the measurement of insulation resistance. Typically, the relay applies a test voltage to the circuit to evaluate the insulation condition. It measures the leakage current flowing through the insulation and calculates the corresponding insulation resistance. If the measured insulation resistance drops below a predetermined threshold, the relay triggers an alarm or initiates protective actions, such as disconnecting the faulty equipment from the system.