Loss Of 1500vDC Power

Question 1

What 1500v DC equipment if develops short circuit, can cause overhead power supply to shut down to avoid damage to substation?

Answer 1

Pantographs

Motor Alternators

Air Compressors

Traction equipment

Associated circuits

EXAM - trains cause faults not substations

Question 2

When there is loss of overhead power how many times will overhead system attempt to reset itself?

Answer 2

Twice

Question 3

What happens to Comeng doors if there is no overhead power?

Answer 3

Doors are released

Question 4

What will Metrol do if unable to restore overhead power?

Answer 4

Make radio group call requesting all drivers to lower pantographs

Question 5

When overhead power has been restored what will Metrol do?

Answer 5

Depart one train at a time in one minute intervals

Question 6

What does the driver have to do once instructed to depart?

Answer 6

Raise all pantographs

Start all MAs

Run in SERIES until location advised by TC

Question 7

When no comms are available and train fails what must a driver not do?

Answer 7

Don’t assume loss of overhead power has occurred.

Question 8

With no comms and train fails what should a driver do?

Answer 8

1. Trip, Switches, Gauges, Cocks
2. Check 110vDC power - bell, low pressure flag, EP brake operational
3. Check AC power available - non- emergency saloon lights available, van area cab light, headlights

Question 9

With no comms, once train is started how long do you have to wait before applying power?

Then what do you do?

Answer 9

30 seconds for an up train

60 seconds for a down train

Run in SERIES until next station

Question 10

How long will emergency lights operate with no overhead power?

Answer 10

2 hours

Question 11

How will Driver know the emergency lighting needs to be reset?

Answer 11

Battery charger light will flash

Turn marker lights from auto to any position and back again.

Question 12

How long will PA system remain operational?

Answer 12

2 hours.

Will be reset with lighting.

Question 13

What are the two components of the LSM that monitor train status?

Answer 13

Time Delay Relay

Speed Threshold

Question 14

What is the LSM Speed threshold?

Answer 14

8kmh

Question 15

What does LSM do with BVICS open in leading car if speed is over 8kmh and overhead power is lost?

Answer 15

EP CB trips - running on air brake

Shuts down local MA

Lowers all trailing pantographs

Question 16

What does the 110vDC output have to drop to for the LSM to take action?

Answer 16

95vDC for 2 continuous seconds

Question 17

What does LSM do with ALL BVICS closed speed zero and timers within 4 minutes?

??????????

Answer 17

EP CB Trips - running on air

Shuts down what was lead MA

Lowers all trailing Pantographs

Question 18

What does LSM do with all BVICS closed, speed zero, timers zero?

Answer 18

MA Contactors set to OFF

All pantographs will lower

PA and emergency lighting will be available.

Question 19

How long will VICERS take to operate when pantos are dropped?

Answer 19

5 minutes

VAV will open after 5 minutes

Question 20

If power is restored and Metrol have established the problem isn’t weak substation output, the cause is a train with defective 1500vDC equipment.

What will TC do?

Answer 20

Work with trains one by one requesting each driver to raise all Panto’s and start all MA’s.

When overhead power is lost, the defective train has been identified

Question 21

If MAs Overspeed can they be reset by traction overload reset button?

Answer 21

No

Question 22

What can weak substation output cause?

Answer 22

Reduced traction effort

Reduced Rheo performance

Loss of one or more AC

Loss of one or more MA