Qianjin Liu

Title: Innovations of Qianjin Liu in Power System Protection

Introduction

Qianjin Liu is a notable inventor based in Beijing, China. He has made significant contributions to the field of power systems, particularly in the area of protection mechanisms. With a total of 3 patents, Liu's work focuses on enhancing the reliability and efficiency of power transmission systems.

Latest Patents

One of Liu's latest patents is titled "Fast power swing unblocking method and apparatus for distance protection in power system." This invention discloses a method that ensures fast phase-segregated tripping of distance protection during power swings. The method involves calculating changing rates of impedances for all operating loops of the distance protection and determining a fault loop based on these calculations. This innovation significantly improves the performance of distance protection during power swings, enhancing system reliability.

Another important patent by Liu is the "Method and apparatus for fault identification in a power transmission line." This method includes measuring signals at the end of a transmission line to identify faults. By comparing the measured signal with a predefined standard signal, Liu's invention can distinguish between transient and permanent faults, thereby improving fault management in power systems.

Career Highlights

Qianjin Liu is currently employed at ABB Research Ltd., where he continues to develop innovative solutions for power system protection. His work has been instrumental in advancing technologies that ensure the safety and reliability of electrical networks.

Collaborations

Liu collaborates with talented professionals in his field, including colleagues Bin Su and Lei Jing. Their combined expertise contributes to the development of cutting-edge technologies in power systems.

Conclusion

Qianjin Liu's contributions to power system protection through his innovative patents demonstrate his commitment to enhancing the reliability of electrical networks. His work continues to influence the field positively, ensuring safer and more efficient power transmission systems.