Real-time Implementation of Controlled Energization of Coupled Power Transformer using Multi-Stepped PIR: Part-2

In this era, smart grid technologies enable efficient and reliable switching of the power transformer to optimize energy flow and improve overall system performance. Hence, in order to reduce the energy consumption in Pre-Insertion Resistor (PIR), multi-stepped PIR along with Point on Wave Switching Device (PoWD) is proposed during the energization of magnetically and electrically coupled power transformers using a multi-stepped PIR and a PoWD. In order to limit the Mechanical Operating Time Scatter effect of Circuit Breaker (CB), a hybrid combination of CB having a PoWD with a PIR is used. This combination is readily available in one-and-half-breaker scheme used at Extra High Voltage substations in the Asia–Pacific region. The proposed technique has been tested by precise modeling. The comparative evaluation suggests that the proposed technique minimizes the level of inrush and reduces the energy consumed by 65 and 52% during controlled energization of magnetically and electrically connected power transformers, respectively. At last, real-time implementation of the proposed scheme is discussed. The result shows effectiveness of the proposed technique. The wide range of applicability of the proposed technique is proved using hardware implementation.