EDAboard.com | EDAboard.eu | EDAboard.de | EDAboard.co.uk | RTV forum PL | NewsGroups PL

Current transformer

Ask a question - edaboard.com

elektroda.net NewsGroups Forum Index - Electronics Design - Current transformer

Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8  Next

John Larkin
Guest

Wed Feb 01, 2012 5:09 am   



On Tue, 31 Jan 2012 19:30:22 -0800, josephkk
<joseph_barrett_at_sbcglobal.net> wrote:

Quote:
On Mon, 30 Jan 2012 07:16:21 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 30 Jan 2012 01:21:27 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Sat, 28 Jan 2012 19:56:36 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 28 Jan 2012 19:30:48 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Sat, 28 Jan 2012 18:12:46 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 28 Jan 2012 18:01:11 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Tue, 24 Jan 2012 21:47:41 -0600, "vkj"
tranquine_at_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

josephkk
Guest

Thu Feb 02, 2012 6:06 am   



On Tue, 31 Jan 2012 20:09:55 -0800, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

Quote:
On Tue, 31 Jan 2012 19:30:22 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Mon, 30 Jan 2012 07:16:21 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 30 Jan 2012 01:21:27 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Sat, 28 Jan 2012 19:56:36 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 28 Jan 2012 19:30:48 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Sat, 28 Jan 2012 18:12:46 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 28 Jan 2012 18:01:11 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Tue, 24 Jan 2012 21:47:41 -0600, "vkj"
tranquine_at_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:


Quote:
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

Get the point yet?

?-)

John Larkin
Guest

Thu Feb 02, 2012 6:12 am   



On Wed, 01 Feb 2012 21:06:57 -0800, josephkk
<joseph_barrett_at_sbcglobal.net> wrote:

Quote:
On Tue, 31 Jan 2012 20:09:55 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Tue, 31 Jan 2012 19:30:22 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Mon, 30 Jan 2012 07:16:21 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 30 Jan 2012 01:21:27 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Sat, 28 Jan 2012 19:56:36 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 28 Jan 2012 19:30:48 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Sat, 28 Jan 2012 18:12:46 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 28 Jan 2012 18:01:11 -0800, josephkk
joseph_barrett_at_sbcglobal.net> wrote:

On Tue, 24 Jan 2012 21:47:41 -0600, "vkj"
tranquine_at_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

P E Schoen
Guest

Thu Feb 02, 2012 6:20 am   



"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_4ax.com...

Quote:
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

Ralph Barone
Guest

Fri Feb 03, 2012 3:33 am   



"P E Schoen" <paul_at_peschoen.com> wrote:
Quote:
"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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

Groan...

Michael A. Terrell
Guest

Sat Feb 04, 2012 12:55 am   



P E Schoen wrote:
Quote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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.

John Larkin
Guest

Sat Feb 04, 2012 1:09 am   



On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell"
<mike.terrell_at_earthlink.net> wrote:

Quote:

P E Schoen wrote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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

Jim Thompson
Guest

Sat Feb 04, 2012 1:20 am   



On Fri, 03 Feb 2012 16:09:09 -0800, John Larkin
<jlarkin_at_highlandtechnology.com> wrote:

Quote:
On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell"
mike.terrell_at_earthlink.net> wrote:


P E Schoen wrote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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.

Quote:
**********************************

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.

P E Schoen
Guest

Sat Feb 04, 2012 1:24 am   



"John Larkin" wrote in message
news:8otoi79v6u4uqstjuoj8t6isojse8506ta_at_4ax.com...

Quote:
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
"wave"!

But I better stop before I get all fluxed up.

Paul

Michael A. Terrell
Guest

Sat Feb 04, 2012 1:39 am   



John Larkin wrote:
Quote:

On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell"
mike.terrell_at_earthlink.net> wrote:


P E Schoen wrote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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.

Michael A. Terrell
Guest

Sat Feb 04, 2012 1:41 am   



P E Schoen wrote:
Quote:

"John Larkin" wrote in message
news:8otoi79v6u4uqstjuoj8t6isojse8506ta_at_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
"wave"!

But I better stop before I get all fluxed up.


What a load of Litz!

--
You can't have a sense of humor, if you have no sense.

John Larkin
Guest

Sat Feb 04, 2012 2:14 am   



On Fri, 03 Feb 2012 17:20:07 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon_at_On-My-Web-Site.com> wrote:

Quote:
On Fri, 03 Feb 2012 16:09:09 -0800, John Larkin
jlarkin_at_highlandtechnology.com> wrote:

On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell"
mike.terrell_at_earthlink.net> wrote:


P E Schoen wrote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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.

Idiot. I did that days ago. I'm experimenting.


**********************************

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

P E Schoen
Guest

Sat Feb 04, 2012 2:16 am   



"Michael A. Terrell" wrote in message
news:5omdnSEBY9TD47HSnZ2dnUVZ_o6dnZ2d_at_earthlink.com...

Quote:
Delaminated...

Not really. I've always been fair -right?

Paul

Jim Thompson
Guest

Sat Feb 04, 2012 2:20 am   



On Fri, 03 Feb 2012 17:14:25 -0800, John Larkin
<jlarkin_at_highlandtechnology.com> wrote:

Quote:
On Fri, 03 Feb 2012 17:20:07 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon_at_On-My-Web-Site.com> wrote:

On Fri, 03 Feb 2012 16:09:09 -0800, John Larkin
jlarkin_at_highlandtechnology.com> wrote:

On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell"
mike.terrell_at_earthlink.net> wrote:


P E Schoen wrote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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.

Idiot. I did that days ago. I'm experimenting.


**********************************

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

If you did that "days ago" why is your signature still there when someone
replies? Senility setting in firmly ?Smile

...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.

John Larkin
Guest

Sat Feb 04, 2012 2:37 am   



On Fri, 03 Feb 2012 18:20:16 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon_at_On-My-Web-Site.com> wrote:

Quote:
On Fri, 03 Feb 2012 17:14:25 -0800, John Larkin
jlarkin_at_highlandtechnology.com> wrote:

On Fri, 03 Feb 2012 17:20:07 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon_at_On-My-Web-Site.com> wrote:

On Fri, 03 Feb 2012 16:09:09 -0800, John Larkin
jlarkin_at_highlandtechnology.com> wrote:

On Fri, 03 Feb 2012 18:55:43 -0500, "Michael A. Terrell"
mike.terrell_at_earthlink.net> wrote:


P E Schoen wrote:

"John Larkin" wrote in message
news:um6ki7lnm5lsb3tte1u02a1gkoc43h2lp6_at_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.

Idiot. I did that days ago. I'm experimenting.


**********************************

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

If you did that "days ago" why is your signature still there when someone
replies? Senility setting in firmly ?:-)

...Jim Thompson

I have different sigfiles at work and at home. If you had the guts to
keep me killfiled, we'd both be better off.


**********************************

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

Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8  Next

elektroda.net NewsGroups Forum Index - Electronics Design - Current transformer

Ask a question - edaboard.com

Arabic versionBulgarian versionCatalan versionCzech versionDanish versionGerman versionGreek versionEnglish versionSpanish versionFinnish versionFrench versionHindi versionCroatian versionIndonesian versionItalian versionHebrew versionJapanese versionKorean versionLithuanian versionLatvian versionDutch versionNorwegian versionPolish versionPortuguese versionRomanian versionRussian versionSlovak versionSlovenian versionSerbian versionSwedish versionTagalog versionUkrainian versionVietnamese versionChinese version
RTV map EDAboard.com map News map EDAboard.eu map EDAboard.de map EDAboard.co.uk map Opony