Patent ID: 11885843
Assignee: HITACHI ENERGY LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. The method according to claim 11, wherein the instantaneous measurement point voltage value is calculated by:

uq_k=m1·uk−m2·(R·ik=L·dik/dt)

wherein uq_k represents the instantaneous measurement point voltage value at instant k, uk represents the sampled value of the voltage at instant k, ik represents the sampled value of the current at instant k, R and L, respectively, represent the resistance value of the resistor and the inductance value of the inductor in the time-domain lumped parameter model,, di
    k
  
  dt, represents a differential value of the sampled value of the current ik, and m1 and m2 are coefficients specified by the operation criterion of the protection device.