The essential information includes: Serial Number For proper identification and traceability. Accuracy The maximum allowable measurement error. Protection class Indicates accuracy of the AcuCT Flex Pro series in high-fault current events. Rated Primary current (Ipr) Input current measured by the AcuCT Flex Pro series. Rated Secondary Voltage (Usr) Proportional low output voltage to the rated primary current Ipr. Rated Extended Primary Current Factor (Kpr) A multiplier to the rated primary current Ipr to indicate the range of current handling capacity during fault conditions. For e.g.: If the Ipr is 500A and Kpr is 8, then the AcuCT Flex Pro series can accurately measure up to 4000A (500A x 8 = 4000A) without losing its accuracy. Phase offset correction (Φo_Cor) Used to compensate for the phase shift occurred inherently during measurement to avoid false alarms in the systems. Coil Factor (CFI) Coil specific multiplier applied to the relay settings to compensate for manufacturing tolerances, ensuring maximum precision. Low Pass Integrator Time Constant (LPIT (di/dt)) The time constant used by integrator to reconstruct current waveform from AcuCT Flex Pro series’ derivative output. This ensures an accurate transient response during fault conditions.
