Wednesday, May 6, 2020

Sequence Route release (UYR 1, 2, 3) - Part 17


 Different way to energies ALSR- Part 2

It can be energies in the following ways.

  1. Sequence Route release. - UYR
  2. Full route Emg.. Cancellation.(Timer present) - EUYN
  3. Approach Track not occupied.(Timer present) - RRBUN
  4. Calling on Cancellation. 

  1. Sequence Route release.
When the signal is taken off, the train passes the signal and travel over the set route, thereby picking up the ALSR, only when the following condition are meet:

  1. The sequential route release relay UYR1,2,3 have picked up through ALSR back contact indicating the sequential, directional movement and arrival of train. 
  2. The track circuits in the entire route up to Berthing track have picked up behind the train.
  3. The controlling switch if any has been normalised or route release relay (NRRs picked up) concerned is dropped.
  4. The signal is put back to 'ON' and the controlling relay and indication relay have dropped.
Ones the ALSR picked up , on the arrival of train , the UYRs, drop, to be activated for another signaled movement and proved in HR circuit.

Ones picked up , ALSR gets it stick feed , bypassing NRRs back contact , back locking track circuits and approach locking circuit. etc..

This is to prevent dropping of ALSR, due to back lock track circuit dropping during other signal movement or track circuit failure or switch contact  failure when signal is not given.

Once ALSR picks up , the locking on the point is released.

-- Sequence(UYR) prove hota hai Track circuit k dawara.

-- Final UYR relay made slow to release.

-- Take ALSR() and Controlling Relay()

-- Normal cancellation path : LR() -> UCR() -> ALSR()

-- TSR() rahega tabhi Normal cancellation hoga.

-- It is to be understood that the Route locked for a signal movement should get
    released only after the train has arrived on proper signal in proper direction
    and the track circuits have been sequentially actuated by the train. 

-- This is registered by the picking up of sequential proving relays (UYRs (some 
    railways call them as TPZR, TSSLR etc.). 

--The pick up contact of UYRs are used to energise ASR in the normal route 
   release path.  

Write Sequence route release circuit for 1/C-1?

Use this UYR3 in ALSR circuit.

Why UYRs are made slow to release?

ASR picks up through UYRs front contact.  Therefore, it is necessary to ensure that after the train arrival UYRs do not drop unless sufficient time is given for ASR to pick up and stick.  Any failure in the time delay arrangement will not give sufficient time for ASR to pick up resulting to a failure and this aspect is to be taken care during maintenance for a trouble free working.

Summary of UYRs

UYRs are normally in de-energised condition.
UYRs are picked up to assist ASR to pick up, and it proves that train has
        successfully traveled over the route by sequentially occupying all the 
        tracks in the route.  
These relays are named after signal concerned.
Front contact used in ASR circuits and also for its stick path.
Back contact proved in HR circuit.
UYRs are having slow to release feature.


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