Basic Features

• Detecting any deviation from the permitted voltage, frequency or overexcitation values will cause it to respond according to the values set
• Can be applied for system decoupling and load shedding in case of a risk of a system collapse resulted from inadmissibly large frequency drop
• Integrated load restoration function allows the power system to be re-established after system frequency recovers
• Has flexible protection functions as it allows users to create up to 20 additional protection functions
• Rate of change of frequency function or a reverse power function can be created
• Provides control of circuit-breaker and additional primary switching devices (e.g. grounding switches, transfer switches, and isolating switches)
• Automation or PLC logic functionality is also implemented
• Integrated programmable logic (CFC) allows users to add own functions (e.g. for the automation of switchgear (including interlocking, transfer, and load shedding schemes))
• Allows user-defined messages to be generated
• Communication module can easily be replaced or upgraded to future communication protocols as it is independent from the protection
• Undervoltage/overvoltage protection (27/59)
• Rate-of-voltage-change protection (59N/27R/59R)
• Overfrequency/underfrequency protection (81O/U)
• Load restoration (81LR)
• Jump of voltage vector
• Overexcitation protection (24)
• Phase-sequence-voltage supervision (47)
• Synchrocheck (25)
• Rate-of-frequency-change protection (81R)
• Trip circuit supervision (74TC)
• Lockout (86)