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Schweitzer and his wife Beatriz are active philanthropists. They support numerous causes related to education and caring for those in need. For example, in 2018, they pledged 3 million dollars to their Alma Mater, Purdue. $1.5 million going to the School of Electrical and Computer Engineering to endow a professorship, and another $1.5 million ...
SEL was founded in Pullman, Washington in 1982 when Dr. Edmund O. Schweitzer III invented and marketed the first all-digital protective relay. Schweitzer created the relay as a Ph.D. project while at Washington State University. He sold his first product, the SEL-21, to Otter Tail Power Company in Fergus Falls, Minnesota in 1984. Otter Tail ...
A related term sealing current (aka wetting current or fritting current) is widely used in the telecommunication industry describing a small constant DC current (typically 1-20 mA) in copper wire loops in order to avoid contact oxidation of contacts and splices.
Low voltage and low current signals (i.e., at the secondary of a voltage transformers and current transformers) are brought into a low pass filter that removes frequency content above about 1/3 of the sampling frequency (a relay A/D converter needs to sample faster than twice per cycle of the highest frequency that it is to monitor).
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Jonathan Sykes is an Engineering Services Manager at Schweitzer Engineering Laboratories (SEL) in Albuquerque, New Mexico.Sykes graduated from the University of Arizona in 1982 and since that time has worked in electric power industry at System Protection and Test and at Pacific Gas and Electric Company in San Francisco, California, where he also served as senior manager.
After he turned Tulane into a six-win team two seasons after the Green Wave went 1-10 in Brown’s first season as a college head coach in 1985, he was hired at North Carolina in 1988.
Image source: Getty Images. 1. Lockheed Martin. After its stock price reached an all-time high earlier this year, Lockheed Martin and its defense contractor peers have sold off considerably over ...