27.Track Circuits
As per new SEM, Minimum length of Track Circuit is 26 m( Two rail length) Glued joint Insulation Resistance- Not more than 25M ohms in dry conditions and not less than 3 k ohms in wet conditions. Glued joint are to be replaced after 250 GMT ( Gross million Tonnes) of Movement of Traffic. Stray Voltage - not more than 10 m Volt track circuit upto 100m. 100mV for track circuit more than 100 metres. Stray current - Not more than 10 mA for TC upto 100 Mts. Not more than 100mA for length of TC is equal or above 100 mts. B type choke for 25 KV AC RE Area- 120 ohm impedence and 3 ohm Resistence. QTA2 - pick up voltage 1.40 v , pick up current should be 140 mA.Minimum Excitation is not less than 125% of rated pick up voltage.Maximum Excitation is not less than 300% of rated pick up voltage for plug in type Track Relay. Configuration 2F1B.AC immunity is 50V AC. QBAT - pick up voltage 1.75V, max pick up current should be 175 mA.Minimum Excitatio...
Comments
Post a Comment