swt_passenger
Veteran Member
- Joined
- 7 Apr 2010
- Messages
- 31,468
Right, here's some info.
I've got a 15 page engineering paper here that describes how Ludgate Cellars controls the contactors that control the progressive changeover over the traction return system from AC mode to DC mode through the core.
Just because you think it's only a substation doesn't mean it doesn't contain complicated equipment to do other stuff:
For instance:
Or how about:
Or perhaps:
I've got a 15 page engineering paper here that describes how Ludgate Cellars controls the contactors that control the progressive changeover over the traction return system from AC mode to DC mode through the core.
Just because you think it's only a substation doesn't mean it doesn't contain complicated equipment to do other stuff:
For instance:
The substation is one of the most advanced of its type on the Network Rail infrastructure. It contains eight transformer/rectifiers, two auxiliary transformers, one Distribution Network Operator (DNO) isolating
transformer, eight contactors, four Programmable Logic Controllers (PLCs), four Remote Terminal Units (RTUs), two AC distribution suites, four DC distribution suites, and four Voltage Limiting Devices (VLDs).
http://www.ukpowernetworks.co.uk/wc..._Thameslink_Case_Study_AW_FINAL_full_view.pdf
Or how about:
The new Ludgate Cellars site occupies a narrow strip of land between Blackfriars and City Thameslink stations, surrounded on
three sides by commercial property with a working railway on the fourth side. It is here that the company has constructed a twostorey
20 megawatt substation containing eight transformer rectifiers and a suite of
AC, DC and AC/DC switchgear. The substation will also house, in railway terms, a pioneering Programmable Logic Control - unique to Network Rail electrification - which will operate and control an automatic changeover sequence ensuring the safe transit of trains through a specific, congested and very complex area.
http://www.storm-marcomms.co.uk/uploads/asset_file/Thameslink - final.pdf
Or perhaps:
LCS designed Integrated Circuit Breaker Contactor & Motorised Isolator suites provided the automated changeover from DC to AC traction systems. This system ensures that the dual supply period is kept to a minimum to avoid stray current generation by the two power supplies. The Thameslink is intended to have a greatly increased number of trains per hour through its new changeover at Ludgate Cellars (Blackfriars). To ensure that train movements are maintained there is a secondary Circuit Breaker, Contactor & Motorised Isolator suite. A PLC System designed by LCS is used to sequence control and monitor the traction power systems. The system is used to seamlessly changeover to a hot standby secondary suite if a fault is detected. The PLC can ensure that this disruption is kept to a minimum thus saving considerable amounts cost due to downtime.
http://www.lcswitchgear.com/index_Page380.htm