NWKR/RWKR, NWR/RWR, POINT OPERATION CIRCUIT, WCR, POINT OPERATION, WNKR/WRKR, NWKR/RWKR CIRCUIT 

NWKR/RWKR CIRCUIT

* With WLR, RCR/NCR picked up, NWKR/RWKR drops.

* There by all indication relays& its repeater relays (NWKPRs, RWKPRs, NWKSRs, RWKSRs) drop.

 

NWR/RWR CIRCUIT

With WLR up, all indication relays drop, NCR/RCR up, NWR/RWR will pick up at location

 

POINT OPERATION CIRCUIT AT LOCATION

* With NWR/RWR picks up, WJR picks up.

* There by WXR picks up and sticks with its own front contact.

* With WXR picking up, normal feed to WJR removed but WJR held in pick up through time delay condenser circuit.

 

WCR CIRCUIT

• With WXR, WJR, NWR/RWR up and WNKR/WRKR drop, WCR (QBCAI relay) picks up.

 

POINT OPERATION

• With WCR & NWR/RWR up, 110V DC available on bus bar is extended to point machines at A end & B end parallelly.
• Both points are set to Normal or Reverse.

 

 

WNKR/WRKR CIRCUIT

• There by WNKR/WRKR picks up.

NWKR/RWKR CIRCUIT

 

1. Energisation of WNKR/WRKR results in dropping of WJR, WCR, and NWR/RWR.

2. With NWR/RWR dropping, WXR drops.

3. Due to all controlling relays (WCR, WJR, WXR, NWR, RWR) at location dropping and WNKR/WRKR picking up, energizes indication relay NWKR/RWKR at relay room.

 

NWKR/RWKR CIRCUIT

1. Energisation of WNKR/WRKR results in dropping of WJR, WCR, and NWR/RWR.

2. With NWR/RWR dropping, WXR drops.

3. Due to all controlling relays (WCR, WJR, WXR, NWR, RWR) at location dropping and WNKR/WRKR picking up, energizes indication relay NWKR/RWKR at relay room.

 

POINT OPERATION

1. Energisation of NWKR/RWKR results in dropping of WLR and locks the point electrically.  

2. De-energisation of WLR in turn drops PCR1 /PCR2, thereby 110V DC is withdrawn from the location bus bar.

3. In nutshell it can be concluded that point operation initiated, point unlocked, point operated & set, all point controlling relays de-energized, point indication obtained and point locked again.

 

NWKR/RWKR, NWR/RWR, POINT OPERATION CIRCUIT, WCR, POINT OPERATION, WNKR/WRKR, NWKR/RWKR CIRCUIT