Dual (600V/750V) voltage, and TANs: San Jose/Newark
Peter D. Ehrlich
Saturday, September 15, 2001 4:00 AM
In a message dated 14 Sept 2001 @ 1641 PDT, "Greg King"
<[email protected]> wrote:
That is true. San Jose solved that problem neatly that way. All of the
vintage cars there can't get above series point--with one exception: Milan
2001.
Milan 2001 has the capability of traversing the entire San Jose light rail
system because it is pantograph-equipped. On charters, it has gone down to
Santa Teresa and Almaden, and north to Baypointe. However, it has not gone
over to Mountain View--some real or implied bureaucratic reason involved
with signalling involved here. (Contact me OFF-LIST for more on that.)
The 2001 must have some kind of inverter on board to permit 750V operation,
because the shop sets it up for the full controller range to permit faster
operation outside the San Jose Transit Mall portion of the line. For normal
Mall operations, of course, the shop blocks off the parallel portion of the
controllers.
I'm going to have to inquire about Sacramento's voltage. They've done
vintage car operations there from time to time.
Meanwhile, over in Newark, the new constant-tension overhead that was
installed in 1999 was set up to go 600V and 750V. At night, after the last
PCC pulled into Penn Station, the OH lines dept would throw the switch to
750V and permit LRV testing and training to begin. Then, when the training
runs were completed, and the LRVs safely beyond Branch Brook Park, the
voltage would return to 600V. Well, reportedly one night, someone forgot to
throw the switch back. A PCC ventured out onto the line, but didn't get
very far--its motors blew. (I think this was car 25, which had been out of
service long before the end of PCC operation.)
Milantram
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<[email protected]> wrote:
Whilst I'm not sure of the exact details, I think it has to do with the
"value" of the wiring (that is, it's able to take the greater voltage), the
"value" of the resistances and the windings and insulation of the motors. For
instance, in San Jose, when they tried to run the veteran cars on the light
rail (750V) they started blowing motors, they resolved the problem simply by
not allowing the controlers to move beyond series, at 750 volts, this almost
gave them parallel speed at 600v.
Greg
That is true. San Jose solved that problem neatly that way. All of the
vintage cars there can't get above series point--with one exception: Milan
2001.
Milan 2001 has the capability of traversing the entire San Jose light rail
system because it is pantograph-equipped. On charters, it has gone down to
Santa Teresa and Almaden, and north to Baypointe. However, it has not gone
over to Mountain View--some real or implied bureaucratic reason involved
with signalling involved here. (Contact me OFF-LIST for more on that.)
The 2001 must have some kind of inverter on board to permit 750V operation,
because the shop sets it up for the full controller range to permit faster
operation outside the San Jose Transit Mall portion of the line. For normal
Mall operations, of course, the shop blocks off the parallel portion of the
controllers.
I'm going to have to inquire about Sacramento's voltage. They've done
vintage car operations there from time to time.
Meanwhile, over in Newark, the new constant-tension overhead that was
installed in 1999 was set up to go 600V and 750V. At night, after the last
PCC pulled into Penn Station, the OH lines dept would throw the switch to
750V and permit LRV testing and training to begin. Then, when the training
runs were completed, and the LRVs safely beyond Branch Brook Park, the
voltage would return to 600V. Well, reportedly one night, someone forgot to
throw the switch back. A PCC ventured out onto the line, but didn't get
very far--its motors blew. (I think this was car 25, which had been out of
service long before the end of PCC operation.)
Milantram
------------------------ Yahoo! Groups Sponsor ---------------------~-->
The Nissan Sentra
Everything but compact
http://NissanDriven.com
http://us.click.yahoo.com/3vsIKC/txlCAA/ySSFAA/DiTxlB/TM
---------------------------------------------------------------------~->
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/