Article View: sci.electronics
Article #22557Re: High Pressure Sodium Lamp Failure Characteristics
From: John Woodgate
Date: Tue, 04 Feb 2003 22:26
Date: Tue, 04 Feb 2003 22:26
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I read in sci.electronics.design that Dale <ewgeneral@yahoo.com> wrote (in <65050f09.0301282112.294b0685@posting.google.com>) about 'High Pressure Sodium Lamp Failure Characteristics', on Tue, 28 Jan 2003: >Im looking at detecting failure of HPS street lamps where say you have >up to 20 lamps on a particular circuit. Im only interested in knowing >that one or more lamps are in failure state (i.e. from the moment they >start to go through their on-off cycle) > >(If anyone has got ideas on when a particular lamp has failed, via a >single feeder circuit, of course I would be very interested, even >maybe have a job for you!!! ;) > >Failing a method for above, even a pointer or two to any links that >may characterise the failure mode i.e. current/voltage characteristics >of such would be a start. When they fail, they draw almost no current, don't they? So obviously, there is no difficulty in detecting that 'a' lamp has failed. But detecting which one, without installing some electronics in each lamp, is unlikely to be feasible. Time-domain reflectometry? But you would get lots of 'clutter' from permanent discontinuities in the cables. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,d19578c6e21becad X-Google-Attributes: gid112d1e,public X-Google-Thread: 105d97,d19578c6e21becad X-Google-Attributes: gid105d97,public X-Google-Thread: 103407,d19578c6e21becad X-Google-Attributes: gid103407,public X-Google-Thread: 107cee,d19578c6e21becad X-Google-Attributes: gid107cee,public X-Google-Thread: 111d0a,d19578c6e21becad X-Google-Attributes: gid111d0a,public X-Google-ArrivalTime: 2003-02-04 22:29:49 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed.icl.net!newsfeed.fjserv.net!colt.net!kibo.news.demon.net!news.demon.co.uk!demon!jmwa.demon.co.uk!jmw From: John Woodgate <jmw@jmwa.demon.contraspam.yuk> Newsgroups: sci.electronics,sci.electronics.design,aus.electronics,sci.electronics.basics,sci.electronics.misc Subject: Re: High Pressure Sodium Lamp Failure Characteristics Date: Tue, 4 Feb 2003 22:26:40 +0000 Organization: JMWA Electronics Consultancy Lines: 26 Message-ID: <eRdCiACg4DQ+Ewyp@jmwa.demon.co.uk> References: <65050f09.0301282112.294b0685@posting.google.com> Reply-To: John Woodgate <jmw@jmwa.demon.co.uk> NNTP-Posting-Host: jmwa.demon.co.uk Mime-Version: 1.0 X-Trace: news.demon.co.uk 1044426587 29527 158.152.135.100 (5 Feb 2003 06:29:47 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Wed, 5 Feb 2003 06:29:47 +0000 (UTC) X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>