I have been further asked:
Please clarify the following:
1.Why 1st TPR [DC track circuit] and USR'S made slow to pick up?
2.Why UKR made neutral relay?
3.To make the relay slow to release what is purpose of diode?
4.Why WZR made slow to release?
5.In NZLPR/RZLPR circuit: Purpose of WZR contact parallel with NLR/RLR contact?
6.Is there any typical circuit to give flashing indication for the following action:
. Point CR relay not picked up
. Once entrance button is pressed
7.Magnetic shunt (with CU slug) making the relay to achieve AC immunized and slow to pick up function, Please explain the working?
8.what is the advantage of giving the supply to relay front/back contact? [But in indian railway circuit the supply will be given to arm contact]
9.In (S)R and (D)R circuit, what is the purpose of forward biased diode?
10.Please explain how the relay is working as Slow to pick up When we connect the reverse biased diode across the relay?
11.Explain the working principle [With circuitry] of TD & override ?
12.DC Track circuit: [In india]
Relay terminal voltage is not more than 300% of Pick up voltage
After train shunt,
Relay terminal voltage should be less than 85% of drop away voltage
what is the parameter for the same in UK railway and how it is achieved in TFU?
Please clarify the following:
1.Why 1st TPR [DC track circuit] and USR'S made slow to pick up?
2.Why UKR made neutral relay?
3.To make the relay slow to release what is purpose of diode?
4.Why WZR made slow to release?
5.In NZLPR/RZLPR circuit: Purpose of WZR contact parallel with NLR/RLR contact?
6.Is there any typical circuit to give flashing indication for the following action:
. Point CR relay not picked up
. Once entrance button is pressed
7.Magnetic shunt (with CU slug) making the relay to achieve AC immunized and slow to pick up function, Please explain the working?
8.what is the advantage of giving the supply to relay front/back contact? [But in indian railway circuit the supply will be given to arm contact]
9.In (S)R and (D)R circuit, what is the purpose of forward biased diode?
10.Please explain how the relay is working as Slow to pick up When we connect the reverse biased diode across the relay?
11.Explain the working principle [With circuitry] of TD & override ?
12.DC Track circuit: [In india]
Relay terminal voltage is not more than 300% of Pick up voltage
After train shunt,
Relay terminal voltage should be less than 85% of drop away voltage
what is the parameter for the same in UK railway and how it is achieved in TFU?
PJW