Ann T Hill

Title: Ann T Hill: Innovator in Power Systems

Introduction

Ann T Hill is a distinguished inventor based in Ballston Spa, NY (US). She has made significant contributions to the field of power systems, holding a total of 2 patents. Her innovative work focuses on enhancing the efficiency and stability of power systems through advanced technologies.

Latest Patents

One of her latest patents is the "Combined solid-state and mechanically-switched transformer tap-changer." This invention discloses an End-Turn Solid-State Switching (ETSS) transformer tap that utilizes a high-speed solid-state switching network. This network selects either the end-turn lead or one of several non-isolated taps on a transformer regulating winding. The ETSS connects the selected tap to a single output conductor carrying the transformer load current, effectively changing the reference to one of the possible taps interfaced to the solid-state switching network. The same transformer regulating winding can also be connected in series with a slow-speed mechanically-switched tap-changer (LTC). The ETSS selects one connection point on the regulating winding while the LTC operation selects the second point, producing a difference voltage based on the turns between the selected taps.

Another notable patent is the "Dynamic braking resistor system." This system stabilizes a power system during disturbances by coupling a braking resistor with a power system bus. A controller monitors a power system parameter, such as the speed of a generator, to determine a thyristor control signal. The controller establishes a desired modulation and conditions the biased desired modulation signal to provide the thyristor control signal. A thyristor valve responds to this control signal, coupling the braking resistor with ground potential. This method effectively dampens subsequent oscillations on a power system following disturbances.

Career Highlights

Ann T Hill is currently associated with the Electric Power Research Institute Incorporated, where she continues to innovate in the field of power systems. Her work has been instrumental in developing technologies that enhance the reliability and efficiency of electrical systems.

Collaborations

Throughout her career, Ann has collaborated with notable colleagues, including Murray A Eitzmann and Einar Vaughn Larsen. These collaborations have contributed to her success and the advancement of her inventions.

Conclusion

Ann T Hill is a remarkable inventor whose contributions to power systems have made a significant impact. Her innovative patents reflect her dedication to improving the efficiency and stability of electrical