Line voltage variations is why reglated power supplies were invented. The point is that a small frequency change is not going to blow transformers.
-John =================== > John, > > That's true, but can the secondary voltage stand to drop that much? Let's > say we have a 12 volt regulated circuit, and the design engineer used the > minimum input voltage to the regulator of 13.4 volts, or 1.4 volts over > the > regulated value needed (I've seen this done). Dropping the line from say > 120 Vac to 100 Vac would drop the secondary DC down to around 11.2 to 11.4 > Vdc, well under the minimum supply voltage of 13.4 Vdc, and under the > regulated value. When you get into plate transformers, with high winding > ratios, the voltage drop gets a good bit different. However, I should have > said, one should never run a 60 Hz transformer, or motor, on the same line > voltage it was rated for at a lower 50 Hz. > > Best, > > Will > > *********** REPLY SEPARATOR *********** > > On 6/24/2011 at 7:03 PM J. Forster wrote: > >>I'd severly doubt they'd allow anything like 10%. >> >>Also remember that the peak flux, that determins saturation, is the >>integral of I dT, so you can run a 60 Hz transformer at 50 Hz if you >>reduce the input to 100 VAC instead of 120 VAC. >> >>-John >> >>=================== >> >> >>> We have AEP here, but it's like you said, go out in the country where >>> Buckeye Rual Elect. is, and you have outages all the time, and you >>> don't >>> want to live there in the winter. >>> >>> Clocks is not what I'm concerned over as much as certain pieces of >>> industrial equipment that must rotate at a certain speed, or are > supposed >>> to. Also, if they are going to allow the frequency to get slower, any >>> motor, or transformer, needs more iron in it, and just a 10 Hz > difference >>> is enough to amount to a significant increase in iron. One can easily > use >>> a >>> 50 Hz transformer on 60 Hz, but not a 60 Hz on 50 Hz. The speed > difference >>> in motors from 50 Hz to 60 Hz would be around 1.2%, just roughly > guessing >>> it in my head, at 1800 RPM, and we don't know how much they intend to >>> allow >>> it to vary. >>> >>> Best, >>> >>> Will >>> >>> *********** REPLY SEPARATOR *********** >>> >>> On 6/24/2011 at 6:33 PM gary wrote: >>> >>>>It all depends where you live. I know people that get an outage a week, >>>>so setting clocks is a way of life. >>>> >>>>PGE, bless their corporate hearts, is run both like a Swiss clock and >>>>third world nation power. If you have a fair amount of industry or >>>> malls >>>>nearby (i.e. customers), your power is great. Live at the edge of town, >>>>and things are not so good, even in Silicon Valley. Monte Sereno, Monta >>>>Vista (now Cupertino), etc. >>>> >>>> >>>>On 6/24/2011 6:07 PM, Will Matney wrote: >>>>> I predict, with all of my oracle abilities, snort, that the test >>>>> won't >>> run >>>>> no time until there's a law suit. Almost everyone uses battery >>>>> powered >>>>> clocks nowdays, on the wall, and most alarms are digital with xtal >>>>> timebases. However, there are still those old foggies who still have >>>>> motorized clocks depending on 60Hz to do their duty. If this makes > them >>>>> obsolete, I wonder if the government is prepared to buy folks >>> replacement >>>>> clocks, like they provided the digital receivers for our TV's? Like I >>> said, >>>>> I can see a courtroom battle as I write this. >>>>> >>>>> Best, >>>>> >>>>> Will >>>>> >>>>> *********** REPLY SEPARATOR *********** >>>>> >>>>> On 6/24/2011 at 8:50 PM paul swed wrote: >>>>> >>>>>> "change you can count on" >>>>>> Thanks. All those silly alarm clocks by the bed. >>>>>> >>>>>> On Fri, Jun 24, 2011 at 7:02 PM, Bob Kupiec<bobkup...@comcast.net> >>> wrote: >>>>>> >>>>>>> >>>>>>> AP: Power grid change may disrupt clocks >>>>>>> ----------------------------------------- >>>>>>> http://news.yahoo.com/s/ap/20110624/ap_on_hi_te/us_sci_power_clocks >>>>>>> >>>>>>> >>>>>>> Time Error Correction Elimination >>>>>>> --------------------------------- >>>>>>> http://www.nerc.com/page.php?cid=6|386 >>>>>>> >>>>>>> NERC Report - June 14 >>>>>>> --------------------- >>>>>>> http://www.nerc.com/files/NERC_TEC_Field_Trial_Webinar_061411.pdf >>>>>>> >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>>> To unsubscribe, go to >>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>>> and follow the instructions there. >>>>>>> >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>> and follow the instructions there. >>>>>> >>>>>> __________ Information from ESET Smart Security, version of virus >>>>> signature database 5851 (20110206) __________ >>>>>> >>>>>> The message was checked by ESET Smart Security. >>>>>> >>>>>> http://www.eset.com >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>> >>>>__________ Information from ESET Smart Security, version of virus >>> signature database 5851 (20110206) __________ >>>> >>>>The message was checked by ESET Smart Security. >>>> >>>>http://www.eset.com >>> >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> >> >> >>__________ Information from ESET Smart Security, version of virus > signature database 5851 (20110206) __________ >> >>The message was checked by ESET Smart Security. >> >>http://www.eset.com > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.