A High Speed Method for Loss of Excitation Detection

In case of generator protection, accurate detection of loss of excitation (LOE) of generator is a major concern for power system operation. The conventional approach based on impedance trajectory is prone to mal-operate during stable power swing (SPS) and any large disturbance near the generator bus. Any mal-operation of generator relays threatens both the generator and power system stability. This paper presents a new approach only by investigating the armature current and active power at the generator terminal. This method doesn't consider any intentional time delay. Robustness of method is assured considering different types of loadings. In this work, both the total loss of excitation (TLOE) and partial loss of excitation (PLOE) have been considered. The proposed method is independent of the generator size. The verification of the proposed method and all the required simulations have been done in PSCAD platform.