Niagara Falls use to send out 25 Hz power.. (maybe three phase,On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
The New York Central System was still using 25HZ 3 phase powerOn Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
Looks like they still use 25 HZ...On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
17 or 25Hz gives large motors better get-going ability from start. The pulses help overcome stiction.On Sun, 26 Jan 2020 13:00:49 -0800 (PST), George Herold
gherold@teachspin.com> wrote:
On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
Looks like they still use 25 HZ...
The Sitras SFC Plus frequency converters transform 60 Hz power into
âfunctional, reliableâ 25 Hz electricity. The converted electricity is
then transferred from Metuchen to the various systems that power
[catenary] on the NEC. The upgraded converter technology enables
increased power output, more than doubling the facilityâs capacity,
from 25 MW to 85 MW.
2018
https://www.railwayage.com/passenger/intercity/siemens-updates-nec-traction-power-station/
Would you try to power any of that from a portable Sinewave generator?On Sun, 26 Jan 2020 13:00:49 -0800 (PST), George Herold
gherold@teachspin.com> wrote:
On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
Looks like they still use 25 HZ...
The Sitras SFC Plus frequency converters transform 60 Hz power into
âfunctional, reliableâ 25 Hz electricity. The converted electricity is
then transferred from Metuchen to the various systems that power
[catenary] on the NEC. The upgraded converter technology enables
increased power output, more than doubling the facilityâs capacity,
from 25 MW to 85 MW.
2018
https://www.railwayage.com/passenger/intercity/siemens-updates-nec-traction-power-station/
Yes, 25Hz was common a century ago, it was used for large motors to get better torque at low speeds. It was common in mining towns, since it was needed for the mining equipment. It wasn't produced by military style mobile or portable generators. The Sinewave generators had frequency meters for accurate testing of AC line components. It was common to buy radios, clocks and kitchen appliances made for 25Hz for the areas that used it. Those radios till show up as antiques, because they also worked on 60Hz. The same radio was often built in two models, with the regular 60Hz transformer, or the much larger 25Hz version that cost more. The Military used 60Hz for land based generators and 400Hz for aircraft to reduce the size and weight of motors and transformers.On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
Modern VFD drives do the same thing, but one again, the mechanical meters were in signal generators to test components at the proper frequency, for the US military. Look at Japan. Part of it is 50Hz. The other part is 60Hz, because that was whhat our military set up, after WW-II for their use following the end of the fighting.On Sunday, 26 January 2020 21:51:32 UTC, default wrote:
On Sun, 26 Jan 2020 13:00:49 -0800 (PST), George Herold
gherold@teachspin.com> wrote:
On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
Looks like they still use 25 HZ...
The Sitras SFC Plus frequency converters transform 60 Hz power into
âfunctional, reliableâ 25 Hz electricity. The converted electricity is
then transferred from Metuchen to the various systems that power
[catenary] on the NEC. The upgraded converter technology enables
increased power output, more than doubling the facilityâs capacity,
from 25 MW to 85 MW.
2018
https://www.railwayage.com/passenger/intercity/siemens-updates-nec-traction-power-station/
17 or 25Hz gives large motors better get-going ability from start. The pulses help overcome stiction.
I suspect that may be changing because it sounds like modern subwayOn Sunday, 26 January 2020 21:51:32 UTC, default wrote:
On Sun, 26 Jan 2020 13:00:49 -0800 (PST), George Herold
gherold@teachspin.com> wrote:
On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
Looks like they still use 25 HZ...
The Sitras SFC Plus frequency converters transform 60 Hz power into
functional, reliable 25 Hz electricity. The converted electricity is
then transferred from Metuchen to the various systems that power
[catenary] on the NEC. The upgraded converter technology enables
increased power output, more than doubling the facilitys capacity,
from 25 MW to 85 MW.
2018
https://www.railwayage.com/passenger/intercity/siemens-updates-nec-traction-power-station/
17 or 25Hz gives large motors better get-going ability from start. The pulses help overcome stiction.
The actual traction motors use DC, not AC.
There ere no third rails in mines. Just very large and heavy flexible HV cables. Read about some of the largest coalmines, like the Peabody Coal company had. There was even a song written about it.On Sun, 26 Jan 2020 19:12:23 -0800 (PST), tabbypurr@gmail.com wrote:
On Sunday, 26 January 2020 21:51:32 UTC, default wrote:
On Sun, 26 Jan 2020 13:00:49 -0800 (PST), George Herold
gherold@teachspin.com> wrote:
On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:
On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:
On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:
The TS-382 series were military versions in transit cases. They had a vibration reed frequency meter to display 60 Hz and 400Hz. The insides were protected for Jungle use, and the one I have, (TS-382/F)has heat strips to drive moisture out of the cabinet.
I remember those from navy ET-A school. They had two resonant reeds,
for 40 HZ and 400 HZ.
I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.
Niagara Falls use to send out 25 Hz power.. (maybe three phase,
but I couldn't find a reference.)
George H.
Looks like they still use 25 HZ...
The Sitras SFC Plus frequency converters transform 60 Hz power into
âfunctional, reliableâ 25 Hz electricity. The converted electricity is
then transferred from Metuchen to the various systems that power
[catenary] on the NEC. The upgraded converter technology enables
increased power output, more than doubling the facilityâs capacity,
from 25 MW to 85 MW.
2018
https://www.railwayage.com/passenger/intercity/siemens-updates-nec-traction-power-station/
17 or 25Hz gives large motors better get-going ability from start. The pulses help overcome stiction.
The actual traction motors use DC, not AC.
I suspect that may be changing because it sounds like modern subway
cars are being fitted with DC to 3 phase to run the motors, but the
third rail is still DC.
