On Tue, 31 Jan 2012 19:30:22 -0800, josephkk <joseph_barrett@sbcglobal.net> wrote:>On Mon, 30 Jan 2012 07:16:21 -0800, John Larkin ><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >>On Mon, 30 Jan 2012 01:21:27 -0800, josephkk >><joseph_barrett@sbcglobal.net> wrote: >> >>>On Sat, 28 Jan 2012 19:56:36 -0800, John Larkin >>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On Sat, 28 Jan 2012 19:30:48 -0800, josephkk >>>><joseph_barrett@sbcglobal.net> wrote: >>>> >>>>>On Sat, 28 Jan 2012 18:12:46 -0800, John Larkin >>>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>>> >>>>>>On Sat, 28 Jan 2012 18:01:11 -0800, josephkk >>>>>><joseph_barrett@sbcglobal.net> wrote: >>>>>> >>>>>>>On Tue, 24 Jan 2012 21:47:41 -0600, "vkj" >>>>>>><tranquine@n_o_s_p_a_m.n_o_s_p_a_m.gmail.com> wrote: >>>>>>> >>>>>>>>>On 2/12/2011 11:57 AM, Tim Williams wrote: >>>>>>>>>> Actually Jim, that's exactly the problem. >>>>>>>>>> >>>>>>>>>> A high impedance load will work perfectly. >>>>>>>>> >>>>>>>>>Only as long as the primary current doesn't drive the core into >>>>>>>>saturation. >>>>>>>>> >>>>>>>>>Sylvia. >>>>>>>>> >>>>>>>> > > >>>>>>>>Lets not confuse the focus of the issue and consider air cores only, thus >>>>>>>>eliminating saturation. >>>>>>>> >>>>>>>>Lets say your current transformer presents an impedance of 1 milli-Ohm. >>>>>>>>Lets say your current is 20A. The prim. voltage is then 20mV. As someone >>>>>>>>has pointed out the turns ratio of a typical CT could be 1000:1, so the >>>>>>>>sec. open circuit volt is still just 20V. Hardly disastrous. >>>>>>>> >>>>>>>>vkj > > >>>>>>> >>>>>>>Wrong and wrong. The primary impedance applies _ONLY_ when the secondary >>>>>>>is terminated with a proper load (resistor). Otherwise it becomes an >>>>>>>ordinary voltage transformer, and the primary voltage is no longer in the >>>>>>>mV range, but in the volts range, with corresponding kV across the >>>>>>>secondary. >>>>>>> >>>>>> >>>>>>If I may borrow a quotation, "Wrong and wrong." >>>>>> >>>>>>http://en.wikipedia.org/wiki/Rogowski_coil >>>>> >>>>>Not a "normal" current transformer in case you hadn't noticed. >>>>> >>>>>?-) >>>> >>>>We were discussing air-core CTs. >>> >>>Since when? >>> >>>?-) >> >>Since vkj's response to Sylvia. > >Nope. Go read the thread again, you inserted Rogowski coils (for the >second time)What the hell is wrong with you? You're behaving more like a little old lady than most little old ladies. -- John Larkin, President Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Current transformer
Started by ●November 30, 2011
Reply by ●February 1, 20122012-02-01
Reply by ●February 2, 20122012-02-02
On Tue, 31 Jan 2012 20:09:55 -0800, John Larkin <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:>On Tue, 31 Jan 2012 19:30:22 -0800, josephkk ><joseph_barrett@sbcglobal.net> wrote: > >>On Mon, 30 Jan 2012 07:16:21 -0800, John Larkin >><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Mon, 30 Jan 2012 01:21:27 -0800, josephkk >>><joseph_barrett@sbcglobal.net> wrote: >>> >>>>On Sat, 28 Jan 2012 19:56:36 -0800, John Larkin >>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>> >>>>>On Sat, 28 Jan 2012 19:30:48 -0800, josephkk >>>>><joseph_barrett@sbcglobal.net> wrote: >>>>> >>>>>>On Sat, 28 Jan 2012 18:12:46 -0800, John Larkin >>>>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>>>> >>>>>>>On Sat, 28 Jan 2012 18:01:11 -0800, josephkk >>>>>>><joseph_barrett@sbcglobal.net> wrote: >>>>>>> >>>>>>>>On Tue, 24 Jan 2012 21:47:41 -0600, "vkj" >>>>>>>><tranquine@n_o_s_p_a_m.n_o_s_p_a_m.gmail.com> wrote: >>>>>>>> >>>>>>>>>>On 2/12/2011 11:57 AM, Tim Williams wrote: >>>>>>>>>>> Actually Jim, that's exactly the problem. >>>>>>>>>>> >>>>>>>>>>> A high impedance load will work perfectly. >>>>>>>>>> >>>>>>>>>>Only as long as the primary current doesn't drive the core into >>>>>>>>>saturation. >>>>>>>>>> >>>>>>>>>>Sylvia. >>>>>>>>>> >>>>>>>>> >> >> >>>>>>>>>Lets not confuse the focus of the issue and consider air cores =only, thus>>>>>>>>>eliminating saturation. >>>>>>>>> >>>>>>>>>Lets say your current transformer presents an impedance of 1 =milli-Ohm.=20>>>>>>>>>Lets say your current is 20A. The prim. voltage is then 20mV. =As someone>>>>>>>>>has pointed out the turns ratio of a typical CT could be 1000:1,=so the>>>>>>>>>sec. open circuit volt is still just 20V. Hardly disastrous. >>>>>>>>> >>>>>>>>>vkj =20 >> >> >>>>>>>> >>>>>>>>Wrong and wrong. The primary impedance applies _ONLY_ when the =secondary>>>>>>>>is terminated with a proper load (resistor). Otherwise it =becomes an>>>>>>>>ordinary voltage transformer, and the primary voltage is no =longer in the>>>>>>>>mV range, but in the volts range, with corresponding kV across =the>>>>>>>>secondary. >>>>>>>> >>>>>>> >>>>>>>If I may borrow a quotation, "Wrong and wrong." >>>>>>> >>>>>>>http://en.wikipedia.org/wiki/Rogowski_coil >>>>>> >>>>>>Not a "normal" current transformer in case you hadn't noticed. >>>>>> >>>>>>?-) >>>>> >>>>>We were discussing air-core CTs.=20 >>>> >>>>Since when? >>>> >>>>?-) >>> >>>Since vkj's response to Sylvia. >> >>Nope. Go read the thread again, you inserted Rogowski coils (for the >>second time) > >What the hell is wrong with you? You're behaving more like a little >old lady than most little old ladies.No you are being weird. check the thread. vkj returned to normal = current transformers. Copied from above:>>>>>>>>>Lets not confuse the focus of the issue and consider air cores =only, thus>>>>>>>>>eliminating saturation. >>>>>>>>> >>>>>>>>>Lets say your current transformer presents an impedance of 1 =milli-Ohm.=20>>>>>>>>>Lets say your current is 20A. The prim. voltage is then 20mV. =As someone>>>>>>>>>has pointed out the turns ratio of a typical CT could be 1000:1,=so the>>>>>>>>>sec. open circuit volt is still just 20V. Hardly disastrous. >>>>>>>>> >>>>>>>>>vkj =20Get the point yet? ?-)
Reply by ●February 2, 20122012-02-02
On Wed, 01 Feb 2012 21:06:57 -0800, josephkk <joseph_barrett@sbcglobal.net> wrote:>On Tue, 31 Jan 2012 20:09:55 -0800, John Larkin ><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >>On Tue, 31 Jan 2012 19:30:22 -0800, josephkk >><joseph_barrett@sbcglobal.net> wrote: >> >>>On Mon, 30 Jan 2012 07:16:21 -0800, John Larkin >>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On Mon, 30 Jan 2012 01:21:27 -0800, josephkk >>>><joseph_barrett@sbcglobal.net> wrote: >>>> >>>>>On Sat, 28 Jan 2012 19:56:36 -0800, John Larkin >>>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>>> >>>>>>On Sat, 28 Jan 2012 19:30:48 -0800, josephkk >>>>>><joseph_barrett@sbcglobal.net> wrote: >>>>>> >>>>>>>On Sat, 28 Jan 2012 18:12:46 -0800, John Larkin >>>>>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>>>>> >>>>>>>>On Sat, 28 Jan 2012 18:01:11 -0800, josephkk >>>>>>>><joseph_barrett@sbcglobal.net> wrote: >>>>>>>> >>>>>>>>>On Tue, 24 Jan 2012 21:47:41 -0600, "vkj" >>>>>>>>><tranquine@n_o_s_p_a_m.n_o_s_p_a_m.gmail.com> wrote: >>>>>>>>> >>>>>>>>>>>On 2/12/2011 11:57 AM, Tim Williams wrote: >>>>>>>>>>>> Actually Jim, that's exactly the problem. >>>>>>>>>>>> >>>>>>>>>>>> A high impedance load will work perfectly. >>>>>>>>>>> >>>>>>>>>>>Only as long as the primary current doesn't drive the core into >>>>>>>>>>saturation. >>>>>>>>>>> >>>>>>>>>>>Sylvia. >>>>>>>>>>> >>>>>>>>>> >>> >>> >>>>>>>>>>Lets not confuse the focus of the issue and consider air cores only, thus >>>>>>>>>>eliminating saturation. >>>>>>>>>> >>>>>>>>>>Lets say your current transformer presents an impedance of 1 milli-Ohm. >>>>>>>>>>Lets say your current is 20A. The prim. voltage is then 20mV. As someone >>>>>>>>>>has pointed out the turns ratio of a typical CT could be 1000:1, so the >>>>>>>>>>sec. open circuit volt is still just 20V. Hardly disastrous. >>>>>>>>>> >>>>>>>>>>vkj >>> >>> >>>>>>>>> >>>>>>>>>Wrong and wrong. The primary impedance applies _ONLY_ when the secondary >>>>>>>>>is terminated with a proper load (resistor). Otherwise it becomes an >>>>>>>>>ordinary voltage transformer, and the primary voltage is no longer in the >>>>>>>>>mV range, but in the volts range, with corresponding kV across the >>>>>>>>>secondary. >>>>>>>>> >>>>>>>> >>>>>>>>If I may borrow a quotation, "Wrong and wrong." >>>>>>>> >>>>>>>>http://en.wikipedia.org/wiki/Rogowski_coil >>>>>>> >>>>>>>Not a "normal" current transformer in case you hadn't noticed. >>>>>>> >>>>>>>?-) >>>>>> >>>>>>We were discussing air-core CTs. >>>>> >>>>>Since when? >>>>> >>>>>?-) >>>> >>>>Since vkj's response to Sylvia. >>> >>>Nope. Go read the thread again, you inserted Rogowski coils (for the >>>second time) >> >>What the hell is wrong with you? You're behaving more like a little >>old lady than most little old ladies. > >No you are being weird. check the thread. vkj returned to normal current >transformers. > >Copied from above:Are you going to discuss electronics, or get all whiney and netcoppey about who said what when? Whiney, probably. -- John Larkin, President Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●February 2, 20122012-02-02
"John Larkin" wrote in message=20 news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6@4ax.com...> Are you going to discuss electronics, or get all whiney and > netcoppey about who said what when?> Whiney, probably.Actually, my *current* transformer is the one I'm using now. My *potential* transformer is the one I might use in the future. Paul=20
Reply by ●February 2, 20122012-02-02
"P E Schoen" <paul@peschoen.com> wrote:> "John Larkin" wrote in message > news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6@4ax.com... > >> Are you going to discuss electronics, or get all whiney and >> netcoppey about who said what when? > >> Whiney, probably. > > Actually, my *current* transformer is the one I'm using now. > > My *potential* transformer is the one I might use in the future. > > PaulGroan...
Reply by ●February 3, 20122012-02-03
P E Schoen wrote:> > "John Larkin" wrote in message > news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6@4ax.com... > > > Are you going to discuss electronics, or get all whiney and > > netcoppey about who said what when? > > > Whiney, probably. > > Actually, my *current* transformer is the one I'm using now. > > My *potential* transformer is the one I might use in the future.Shockingly bad! -- You can't have a sense of humor, if you have no sense.
Reply by ●February 3, 20122012-02-03
On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell" <mike.terrell@earthlink.net> wrote:> >P E Schoen wrote: >> >> "John Larkin" wrote in message >> news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6@4ax.com... >> >> > Are you going to discuss electronics, or get all whiney and >> > netcoppey about who said what when? >> >> > Whiney, probably. >> >> Actually, my *current* transformer is the one I'm using now. >> >> My *potential* transformer is the one I might use in the future. > > > Shockingly bad!He's obviously lacking core values. ********************************** John Larkin, President Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Reply by ●February 3, 20122012-02-03
On Fri, 03 Feb 2012 16:09:09 -0800, John Larkin <jlarkin@highlandtechnology.com> wrote:>On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell" ><mike.terrell@earthlink.net> wrote: > >> >>P E Schoen wrote: >>> >>> "John Larkin" wrote in message >>> news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6@4ax.com... >>> >>> > Are you going to discuss electronics, or get all whiney and >>> > netcoppey about who said what when? >>> >>> > Whiney, probably. >>> >>> Actually, my *current* transformer is the one I'm using now. >>> >>> My *potential* transformer is the one I might use in the future. >> >> >> Shockingly bad! > >He's obviously lacking core values. > >Bwahahahahahaha! You finally said something funny. Now if you'd just learn what dash-dash-space does we'll remove you from the senility list.>********************************** > >John Larkin, President >Highland Technology, Inc > >jlarkin at highlandtechnology dot com >http://www.highlandtechnology.com > >Precision electronic instrumentation >Picosecond-resolution Digital Delay and Pulse generators >Custom laser controllers >Photonics and fiberoptic TTL data links >VME thermocouple, LVDT, synchro acquisition and simulation...Jim Thompson -- [On the Road] | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●February 3, 20122012-02-03
"John Larkin" wrote in message=20 news:8otoi79v6u4uqstjuoj8t6isojse8506ta@4ax.com...> He's obviously lacking core values.I'm bobbin and weavin' in response to your input. Running a sinusoidal pattern while the crowd executes a perfect square=20 "wave"! But I better stop before I get all fluxed up. Paul=20
Reply by ●February 3, 20122012-02-03
John Larkin wrote:> > On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell" > <mike.terrell@earthlink.net> wrote: > > > > >P E Schoen wrote: > >> > >> "John Larkin" wrote in message > >> news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6@4ax.com... > >> > >> > Are you going to discuss electronics, or get all whiney and > >> > netcoppey about who said what when? > >> > >> > Whiney, probably. > >> > >> Actually, my *current* transformer is the one I'm using now. > >> > >> My *potential* transformer is the one I might use in the future. > > > > > > Shockingly bad! > > He's obviously lacking core values.Delaminated... -- You can't have a sense of humor, if you have no sense.
