Thread: Upgrading sub surface tube lines to 750V
View Single Post
  #21   Report Post  
Old April 13th 10, 09:00 PM posted to uk.transport.london,uk.railway
tony sayer tony sayer is offline
external usenet poster
  
First recorded activity at LondonBanter: Aug 2004
Posts: 87
Default Upgrading sub surface tube lines to 750V
The WCML modernisation scheme uses (mostly!) 400 V three-phase, but
this has not been a great success owing to the higher currents (and
therefore greater number of sources of supply, known as Principal
Supply Points or PSPs) required.

Ummm.. Rather interesting this but this 400 volt 3 phase supply was
"difficult" in quite what way for signalling purposes?..
--
Tony Sayer

Reply With QuoteReply With Quote