May 2016 Luncheon Meeting

Thank you for attending the May luncheon with Rene Midence


Speakers: Rene Midence, ERL Phase Power Technologies

Topic: Understanding Sub Harmonics and the solutions to detect, mitigate and correct issues they may cause using relay and fault recording solutions.

Date: Thursday, May 19th, 2016

Time: 11:30 – 11:45 am: Registration
11:45 am: Lunch
12:00 pm: Program

Location: Bobby Q’s
8501 N 27th Ave.
Phoenix, AZ 85051
(Off I-17 between Dunlap and Northern)

Cost: $8.00 (No cost if you are a college student)

Reservations: Contact Monica at (602) 470-0400 or submit your name here.
Reservations deadline is NOON on Wednesday May 18th, 2016.
If you have already registered for this luncheon but need to cancel, click here.

Over the years, engineers have employed fundamental principles of electrical engineering to solve system problems. For example, series reactors are used to limit the amount of fault current since inductors resist a change in current. Similarly, series line capacitors are used to increase the amount of real power by cancelling a portion of the inductive reactance. However, some solutions can create new problems in the system, as is the case with series line compensated capacitors. When a capacitor is used in a transmission line as a series element, sub-harmonic currents with frequencies below the fundamental are created. Extensive research and study have been done, and the consequences of subharmonic currents can be catastrophic.
The effects of sub-harmonics were visualized back in 1971 after a synchronous generator shaft failure. Since then, generator manufacturers and utilities have worked together to identify problems between the interaction of series capacitors and generators. There are a number of ways to detect, mitigate and correct issues created by sub harmonics using relays and fault recording devices.

For over 30 years, Mr. Midence has been involved in the design and commissioning of power substations and power plants including Protection and Control, SCADA, Substation Automation and Substation LAN systems. His well-rounded experience covers the fields of consulting and engineering, construction and commissioning, manufacturing, strategic marketing, technical support and training.
In the manufacturing business, he has worked in the design and testing of medium and high voltage substations as well as metalclad switchgear, protection and control panels. During his more than 15 years of experience in manufacturing, he has contributed to the development and introduction to market of new protection and control microprocessor based relays, Ethernet switches and routers.
Mr. Midence is a Senior Member of the IEEE, have active participation in the development of IEEE Standards, member of the IEEE Power Systems Relaying Committee (PSRC), member of the International Electrotechnical Commission (IEC) TC57 WG10.
Mr. Midence graduated in 1983 from the University of Honduras with the degree of Bachelor of Applied Science degree in Electrical and Industrial Engineering. He joined ERLPhase Power Technologies in 2010 and currently holds the position of Director of Technical Services.



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