IEEE Power & Energy Magazine - September/October 2017 - 102

figure 5. A modern HVdc converter hall. (Image courtesy of Siemens,
www.siemens.com/press.)

its power rating to increase. As mentioned previously, HVdc installations
that use -thyristors can reach capacities
approaching 8,000 MW, whereas the
largest commissioned HVdc installation
using IGBTs is 1,000 MW per pole.

Patents
Lamm had more than 150 patents to his
name. A search on the European patent office website yields about 120. The
first documented patent on the website
has a publication date of January 1931

with the title "Improved Means for Disconnecting Metal Vapour Rectifiers
on the Occasion of a Reverse Arc." As
discussed previously, the rectifiers were
susceptible to a reverse arc (or arc-back),
which can damage the valve. Lamm's
patent outlined the use of a high-speed
circuit breaker to disconnect the rectifier from the electrical network to help
mitigate the potential damage.
This is just a small piece of the work
performed by Lamm to improve mercury-arc valves for HVdc a- pplication. Some
patents continued to focus on ionic valves
while others targeted grid control and
equipment protection. His patent application would continue for more than 40
years from his initial publication.
While the majority of Lamm's patents
were submitted during his employment
at ASEA, there are a few filed patents in
the mid-1970s that show him as the applicant. These include a chlorinator system,
an electrolytic cell, and a rotary piston engine. An interesting point about the chlorinator system is the length of the patent
filing. While many of his patents were
only a few pages long, the chlorinator system document is 44 pages. This goes to
show that even after his pioneering days
at ASEA, Lamm continued to share his
ideas with the world.

For Further Reading

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K. Wollard, "Uno Lamm: Inventor and
activist," IEEE Spectr., vol. 25, no. 3,
pp. 43-45, Mar. 1988.
W. R. Gould, "August Uno Lamm,"
in Memorial Tributes. Washington,
D.C: National Academy of Engineering, National Academy Press, vol. 5,
1992, pp. 145-152.
"Renaissance man," IEEE Power Eng.
Rev., vol. PER-1, no. 10, pp. 2-3, Oct. 1981.
E. W. Kimbark, Direct Current Transmission. New York: Wiley, vol. I, 1971.
Siemens-High voltage DC transmission system (HVDC). (2017, Apr.
19). [Online]. Available: https://www​
.energy.siemens.com/hq/en/powertransmission/hvdc/
A. U. Lamm, "The peculiarities of
high-voltage dc power transmission,"
IEEE Spectr., vol. 3, no. 8, pp. 76-84,
p&e
Aug. 1966.


http://www.siemens.com/press https://www http://energy.siemens.com/hq/en/power http://www.slacan.com

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