Ahmad Shahsiah
Ahmad Shahsiah, Ph.D., P.E.
Managing Engineer
Engineering Management Consulting
  • Menlo Park

Dr. Shahsiah has provided technical consulting services in numerous engineering and scientific areas for more than a decade. His expertise includes electrical and electronic systems especially energy and power systems. Dr. Shahsiah has consulted in the areas such as electric power substation equipment analysis, large generator design review, building electrical systems and electrical codes, stray voltage investigation, vehicles testing, Electromagnetic Interference, electrical equipment safety review, and reliability evaluation of SCADA and advanced metering systems. Dr. Shahsiah’s responsibilities at Exponent include conducting studies, performing research and investigating failures related to power equipment and systems in industrial and commercial power systems as well as high voltage distribution systems; performing passive and active lifetime and reliability and safety evaluations of electrical equipment; and failure analysis of electrical and electronic systems and components including power storage and conversion systems.

Prior to joining Exponent, Dr. Shahsiah worked on mathematical and experimental characterization of liquid dielectrics in high voltage devices and published an award-winning Ph.D. dissertation in that area. He has extensive experience in electric power systems including extensive knowledge of power transformers and their liquid dielectric testing, power system analysis and computer modeling, power quality, switching and transients, electric machines and drives, and relaying and protection.

Dr. Shahsiah is a lecturer in the school of engineering at San Francisco State University where he has taught graduate and undergraduate courses of engineering including “Advanced Electrical Power Systems” and is a member of the California Faculty Association. He also has taught an engineering education course sponsored by the Pacific Gas and Electric Company (PG&E) in collaboration with California State University at East Bay on the topic of Electrical Transmission and Distribution to mostly working professionals in the power industry. Dr. Shahsiah is the author of several technical papers and one book.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Electric Power Engineering, Rensselaer Polytechnic Institute, 2006
  • M.S., Electric Power Engineering, Rensselaer Polytechnic Institute, 2001
  • Elected senior member of the Institute of Electrical and Electronics Engineers (IEEE)

    Recipient of IEEE Certificates of Appreciation, featured speaker of the San Francisco Power and Energy Society Technical Meetings, March 16, 2009 and September 16, 2015.

    Recipient of the Graduate Fellowship Award from the Dielectrics and Electrical Insulation Society (DEIS) of IEEE, October 2005; Department Scholarship Award, Rensselaer Polytechnic Institute, September 2002; Honorary Diploma, Undergraduate School

LICENSES & CERTIFICATIONS

Licensed Professional Electrical Engineer, California, #18599

Licensed Private Pilot, Federal Aviation Administration, Certificate #3691946

LANGUAGES

  • Farsi

Publications

Shahsiah A. Mass transfer in electrical insulation of power transformers—Modeling migration of characteristic gases between solid and liquid insulations. Book, ISBN: 978-3-639-09659-0, 2008.

Lindgren S, Shahsiah A, Nabavighadi M. Finding the true meaning of CO2 & CO in power transformers—Separating reality from myth using on-line DGA monitoring. EPRI Substation Equipment Diagnostics Conference, Orlando, FL, March 2–5, 2008.

Shahsiah A, Degeneff RC, Nelson JK. Modeling dynamic propagation of characteristic gases in power transformers oil-paper insulation. IEEE Transactions on Dielectrics and Electrical Insulation 2007; 14(3):710–717, June.

Shahsiah A, Degeneff RC, Nelson JK. A study of the temperature-based dynamic nature of characteristic gases in oil-cellulose insulation systems. IEEE Transactions on Dielectrics and Electrical Insulation 2007; 14(2):471–479, April.

Shahsiah A. Modeling dynamic propagation of characteristic gases in transformer oil/paper structure and transformer fault diagnostics. Doctoral dissertation, Rensselaer Polytechnic Institute, May 2006.

Shahsiah A, Degeneff RC, Nelson JK. A new dynamic model for propagation of characteristic gases in transformer oil-cellulose structure due to temperature variations. IEEE Conference on Electrical Insulation and Dielectric Phenomena, Nashville, TN, October 2005. 

Shahsiah A, Degeneff RC, Nelson JK. Modeling dynamic propagation of characteristic gases in power transformers oil/paper structure. EPRI Substation Equipment Diagnostics Conference, New Orleans, LA, March 6–9, 2005. 

Woong D, Yu B, Song, Y, Wang A, Liu, Y, Shahsiah A. Discharge and thermal gassing monitoring using fiber acoustic sensors. EPRI Substation Equipment Diagnostics Conference, New Orleans, LA, February 15–18, 2004. 

Ward B, Degeneff RC, Shahsiah A. Gases generated from bare electrode at elevated temperatures immersed in mineral oil observed over range of temperature and pressure. EPRI Substation Equipment Diagnostics Conference, San Antonio, TX, February 17–20, 2002. 

Academic Appointments

Lecturer, San Francisco State University, Spring 2013–Fall 2016

Professional Affiliations

IEEE, Dielectrics and Electrical Insulation Society—DEIS, 2001–current (member)

IEEE, Power Engineering Society—PES, 2001–current (member) 

Project Experience

Performed a comprehensive study of the reliability and life expectancy of the SCADA and advanced monitoring equipment used in underground installations of the distribution networks in downtown San Francisco and Oakland.

Consulted in the area of DC arc-flash evaluations and risk assessment in novel systems related to renewable energy technology and energy storage.

Participated in evaluation of the equipment grounding in high-voltage distribution systems including compliance with regulatory standards, interview with field personnel and root-cause investigations.

Performed investigations related to an arc flash incident in an industrial compressor plant including site inspection; arc-flash calculations; review of the safety and maintenance procedures; review of the training programs; interview with relevant personnel; developing recommended corrective actions and providing recommended revisions to the safety and training procedures.

Participated in failure investigations of a large generator plant including study of the generator core design and power generation in leading power factor.

Participated in several investigations related to the distribution substation outages including root-cause evaluations and suggestions to improve the system reliability.

Testified as expert witness in a federal case regarding the next generation of liquid dielectrics used in high voltage equipment such as power transforms.

Performed numerous investigations and studies and provided expert opinion regarding failure of high voltage substation equipment including failure of 69 kV potential transformer and 12 kV switchgear failure.

Designed experiments, conducted testing and performed field surveys to evaluate the effect of Electromagnetic Interference on electronic systems in vehicles and co-authored an expert report.

Performed computer simulations using specialized software such as PSpice® and ETAP® to support experimental and measured data and to assist forming expert opinion in different cases.

Evaluated the failure of low voltage equipment due to transients generated by faults in a high voltage distribution system.

Managed and conducted a comprehensive study on electric appliances from a reliability, safety, and fire hazard point of view.

Conducted field inspections in and around a dairy farm to measure and evaluate stray voltage and its effect on livestock.

Performed field inspections to evaluate and document the condition of failed devices including power apparatus, building services, and control equipment.

Investigated failure of electrical equipment in the context of fire cause and origin investigation.

Investigated building electrical systems and code compliance.

Participated in comprehensive analysis of vehicles’ electronic control system including vehicles’ electronic signal studies and electronic safeguards against signal corruption due to outside interferences such as electromagnetic fields.

Participated in battery system reliability study of hybrid/all-electric vehicles.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Electric Power Engineering, Rensselaer Polytechnic Institute, 2006
  • M.S., Electric Power Engineering, Rensselaer Polytechnic Institute, 2001
  • Elected senior member of the Institute of Electrical and Electronics Engineers (IEEE)

    Recipient of IEEE Certificates of Appreciation, featured speaker of the San Francisco Power and Energy Society Technical Meetings, March 16, 2009 and September 16, 2015.

    Recipient of the Graduate Fellowship Award from the Dielectrics and Electrical Insulation Society (DEIS) of IEEE, October 2005; Department Scholarship Award, Rensselaer Polytechnic Institute, September 2002; Honorary Diploma, Undergraduate School

LICENSES & CERTIFICATIONS

Licensed Professional Electrical Engineer, California, #18599

Licensed Private Pilot, Federal Aviation Administration, Certificate #3691946

LANGUAGES

  • Farsi