19-06-2014, 05:37 AM
(17-04-2014, 08:15 PM)dorothy.pipet Wrote: Assuming I'm signalling a layout with Track Circuit Block working and Track Circuits (not Axle Counters), what would be a reasonable maximum TC length to assume in the exam (for plain line sections, long signal spacing).
I'm thinking somewhere between 600m and 1000m - any advice please?
Hi..
Tryin to share some experience on the DC Track Circuits One.
And the good one in my opinion, what dorothy asked is the main thing that I need to count and calculate into a proposal once received a tender requirement for a TC.
For the DC TC length will be depend on value of ballast resistance, which the resistance it self will be depend on the sleepers type and ballast condition.
Normally in a new project to achieve value of relay drop away and pick up current (configure at varistor), I will put 850m length for the good ballast condition.
By assuming we design with the poor ballast condition (re-signalling) then I would like to present 500m length.
Please be free to correct me if I'm wrong
Yendri