2007-05-11 01:39:23 · 3 answers · asked by deepak_8584 1 in Science & Mathematics ➔ Engineering
1) Electrical substations are located near the tracks every few miles.
2) Overhead Catenary (wire) is better than third rail. Third rail is only 700 volts, but overhead catenary wire is usually eleven thousand volts.
3) On the Long Island railroad and the neighboring New York City Subway, the third rail amperage capacity (ampacity) is being upgraded by having a stainless steel "buss bar" bolted to the third rail.
4) Long Island railroad has new trains, which weigh 110,000 pounds per car and have a one thousand amp motor on each axle. The old trains weighed 79,000 pounds (each car) and only had a 600 amp motor on each axle.
The result is overloading, especially during the peak PM (afternoon) rush hour.
2007-05-11 01:53:15 · answer #1 · answered by AviationMetalSmith 5 · 0⤊ 0⤋
Basically an electrical load is balanced by trial and error method. If there is a voltage drop at some portion suitable remedial action is taken like drawing a new electrical line or adding a transformer or a capacitor as per the requirement.
2007-05-11 02:51:26 · answer #2 · answered by deepak57 7 · 0⤊ 0⤋
The railway company knows what load factors will be at all times during train operations.
primary and secondary breakers are in operation at all times to control current flow in case of any type of over load,short circuits,fires etc.
2007-05-11 01:57:04 · answer #3 · answered by Billy Butthead 7 · 0⤊ 0⤋