Comeng Faults - Loss of Overhead Power, Assisting disabled trains

Question 1

What is the job of the LSM?

Answer 1

Reduce impact of 1500vdc to the overhead by switching off circuits to protect the substation overloading with power

Question 2

At what motor alternator output voltage does the LSM activate during loss of overhead power and how long must that voltage be sustained?

Answer 2

95vDC for 2 seconds

Question 3

How long is the time delay on each LSM once the BVIC is closed?

Answer 3

4 minutes

Question 4

What is the LSM speed threshold?

Answer 4

Below or above 8km/h

Question 5

With the BVIC open, what will the LSM do under 8km/h with the loss of overhead power on a motor car?

Answer 5

Bring the train to a stand and ensure leading Pantographs remain up but drop the trailing Pantographs
Ensure leading MA contactors stay closed
Trailing MA contactors open

Question 6

What can cause a loss of overhead power?

Answer 6

Weak substation output or failure
Overhead failure
Defective 1500vdc circuits

Question 7

How long after loss of overhead power will the vicers activation relay exhaust brake pipe to atmosphere?

Answer 7

5 minutes

Question 8

How do you reset an over speeding GEC MA?

Answer 8

Hit the button with a switch stick

Question 9

How many times will Electrol attempt to reset the overhead system in the case of failure?

Answer 9

Twice

Question 10

After startup without communication and after loss of overhead, how long must an up train wait to move?

Answer 10

30 seconds

Question 11

After startup with no communications and after loss of overhead, how long must a down train wait to move?

Answer 11

60 seconds

Question 12

After a restoration of overhead power without communication, what notch must the driver drive in until the next station?

Answer 12

Series ensuring the amps on the ammeter drop below 100amps

Question 13

How does train control locate a defective train overloading the overhead?

Answer 13

Asking each train one by one to raise their pantographs and start MAs
When a train overloads the system train control has identified the train

Question 14

Once the train overloading the system has been identified, what will be asked of the driver?

Answer 14

Raise each panto and MA individually from each motor car until the defective equipment is identified

Question 15

What percentage of operational motors will enable the train to operate over all system gradients?

Answer 15

50%

Question 16

If electrol is unable to restore overhead power, what will train control request each train in the section to do?

Answer 16

Drop their leading pantograph and ensure the rest of the Pantographs have lowered due to the LSM activation

Question 17

If no communications are available and the driver suspects loss of overhead power, what is the procedure?

Answer 17

Step 1 - Trips, Switches, Gauges, Cocks
Step 2 - check 110vdc via bell, lp flag
Step 3 - check 240v saloon lights, cab area cab light

Question 18

What must happen in the motor car powering if it is not the lead motor car?

Answer 18

Turn the red ec

Question 19

What should the master controller be in a speed up to 40km/h with combined trains

Answer 19

Series (position two)

Question 20

What should the master controller be in a speed between 40km/h and 60km/h with combined trains?

Answer 20

Series parallel (position 3)

Question 21

What should the master controller be in a speed between 60km/h and 70km/h with combined trains

Answer 21

Weak fields

Question 22

What is the speed limit for combined trains of 2x6 car sets?

Answer 22

70km/h

Question 23

What is the maximum amount of MOTORS (not motor cars) that are allowed to run in the MURL?

Answer 23

8 motors

Question 24

How many traction motors per 6 car set?

Answer 24

16

Question 25

What is the highest notch to be used in the MURL with 8 motors running?

Answer 25

Series

Question 26

With trailing motors under 8km/h and BVIC open, what happens if the LSM is triggered?

Answer 26

Ep circuit it breaker trips
Leading panto raised
Other pantos dropped
Leading MA contractors on
Trailing MAs off

Question 27

When all BVIC closed and stationary, what happens if the LSM is triggered?

Answer 27

Pantos lower

All MA contactors set too off

Question 28

With speed under 8km/h and BVIC open, what happens if the LSM is triggered?

Answer 28

Ep circuit breaker trips
Leading panto stays up
Trailing pantos drop
Leading MA contactor stays closed
Trailing MA contactor opens

Question 29

Once overhead power is restored

How will all drivers be told to proceed until the next sub station or station

Answer 29

Series ensuring the amps on the ammeter drop below 100amps until higher notches are applied