I haven't done a transformer abnormal/overload test in years but it used to be common to have a hipot failure if done immediately after the load was removed (first few seconds) while the transformer passed after cooling down for a few minutes. CSA and UL always required that the test be done successfully immediately after the load was removed.
Mike Rains Foxboro Co. -----Original Message----- From: pmerguer...@itl.co.il <mailto:pmerguer...@itl.co.il> [SMTP:pmerguer...@itl.co.il] <mailto:[SMTP:pmerguer...@itl.co.il]> Sent: Thursday, December 16, 1999 10:45 AM To: emc-p...@majordomo.ieee.org <mailto:emc-p...@majordomo.ieee.org> Subject: Electric Strength After Abnormals Dear All, After an Abnormal Test for UL1950/EN60950, should the Electric Strength be done a) immediately after the Abnormal Test or b) after Abnormal Tesrt when unit has cooled down to room temperature c) after Abnormal Test when unit has cooled down to Normal Heating Temperature Levels. The standards are not clear! +++++++++++++++++++++++++++++++++++ RTTE Directive Seminar Renaissance Hotel, Tel-Aviv 12th January 2000. For details: http://www.itl.co.il/RTTE.htm <http://www.itl.co.il/RTTE.htm> +++++++++++++++++++++++++++++++++++ Peter Merguerian Managing Director Product Testing Division I.T.L. (Product Testing) Ltd. Hacharoshet 26, POB 211 Or Yehuda 60251, Israel Tel: 972-3-5339022 Fax: 972-3-5339019 e-mail: pmerguer...@itl.co.il <mailto:pmerguer...@itl.co.il> website: http://www.itl.co.il <http://www.itl.co.il> --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org <mailto:majord...@ieee.org> with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com <mailto:ed.pr...@cubic.com> , jim_bac...@monarch.com <mailto:jim_bac...@monarch.com> , ri...@sdd.hp.com <mailto:ri...@sdd.hp.com> , or roger.volgst...@compaq.com <mailto:roger.volgst...@compaq.com> (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
