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Xtrapolis Traction > Train Electrics > Flashcards

Train Electrics Flashcards

1
Q

What are the High Voltage Circuit equipment? (7)

A

Pantograph
Lightening arrestor
HSCBs
Line inductors
Traction inverter
Brake resistor grids
Auxiliary inverter (SIV)

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2
Q

What does the Lightening Arrestor do?

A

Protects 1500vDC against transient over voltage

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3
Q

What do the HSCBs do?

A

Another layer of protection. They will trip if there is a short circuit in train or overhead

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4
Q

What does the Line Inductor do?

A

Filters overhead power

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5
Q

What power do traction motors operate on?

A

3 phase variable AC

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6
Q

What does the TCU do?

A

Acquires information (speed, weight, commands and determines the appropriate amount of power or ED brake

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7
Q

What makes up the Low Voltage System? (6)

A

Auxiliary/Static Inverter (high and low)
400/220 AC
110 DC
24 AC/DC
Batteries
Air Conditioning system

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8
Q

What do Static Inverters (SIVs) do?

A

Convert 1500vDC into 400vAC

Supplies power to Auxiliary Equipment

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9
Q

What do the SIVs supply power to?

A

Battery Charger
Air Compressors
Traction converter cooling fans
HVAC
GPOs (220vAC)

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10
Q

What happens if one Static Inverter shuts down?

A

The other one will supply essential electrical equipment:

  • Battery charger
  • No.1 air compressor
  • Both traction converter cooling fans
  • No.1 AC in each car
  • Full saloon lighting
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11
Q

What does the Battery Charger do?

What voltage does it produce?

A

Runs 110v equipment

Keeps batteries charged

Produces 110vDC to a maximum of 123.6vDC

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12
Q

What are the 3 110vDC distribution lines corresponding to different operational state of the train?

A

Permanent Low Voltage Line

Prepared Low Voltage Line

Prepared Low Voltage and Cab Operative Line

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13
Q

What is the purpose of the Permanent Low Voltage Line?

What does it power?

A

To raise the Pantograph’s

It powers:
- Pantograph electric motor
- Step lights
- Fluorescent cab light

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14
Q

What is powered on the …

Prepared Low voltage and Cab Operative Line?

A

Basically … everything

Panto, Status fault indicators, traction control, braking control, door control, safety loop, communications, lighting …

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15
Q

What is powered on the …

Prepared Low Voltage Line?

A

This is when the key is removed and the train enters a service retention mode:

  • Pantograph’s remain raised
  • Settings of the last active cab are memorised
  • Marker lights, doors and saloon lights retain the setting they had when key was removed

… changing ends …

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16
Q

Where does the 24vDC power come from?

A

It’s derived from the Prepared Low Voltage line

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17
Q

What operates on 24vDC?

A

Headlights, driver’s seat, marker lights, speedo, windscreen wipers, gauge lights, MAD button CCTV, brake lights …

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18
Q

What is powered by 24vAC?

A

High beam headlights

CCTV cameras

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19
Q

How does the Permanent Low Voltage line remain energised when the train is stabled?

A

Batteries

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20
Q

In normal operation, what charges the 110vDC equipment?

A

The Battery Charger

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21
Q

If a Static Inverter fails or there is a loss of high voltage how does emergency equipment get its power?

A

Batteries

22
Q

How long will the batteries work for?

A

1 hour … to get the train off the mainline

23
Q

What is the Safety Loop?

A

Electrical circuit that connects all of the safety critical components to the Emergency Brake System

24
Q

What will activate the emergency brakes? (10)

A

Main Res. falls below 580 kPa
BP falls below 300 kPa
Trip is activated or raised
Hand or Foot vigilance devices not set
Activation of VICERS
Loss of 110vDC
MCH placed to emergency
Emergency stop button pressed in any cab
Two or more controller keys inserted
23Q1 or 23Q2 CBs trip in lead cab

25
Q

How do you reset the Trip?

A

Speed must be below 0.5kmh

Train must be stationary for 5 seconds

Turn Trip Cock Device to RESET and release

Trip activated light will extinguish when reset

26
Q

What does the Safety Loop Test look for?

A

It tests to see if 23Q1 or 23Q2 CBs have tripped. They protect the Safety Loop

27
Q

What do you have to do while doing the Safety Loop Test?

A

Set the Hand Pilot Valve

28
Q

If you use the Safety Loop Switch (put it in BYPASS) what does this mean for the train?

A

There are no emergency brakes

29
Q

What positions does the 110v Safety Loop Supply Switch have?

A

NORMAL

RESCUE

Don’t confuse with Safety Loop Bypass switch - Normal, Test, Bypass

30
Q

What is the 110v Safety Loop Supply Switch for?

A

After failure of 110vDC power and being rescued by another XTrap, turn to RESCUE.

Allows power from rescuing train to energise Safety Loop

31
Q

When a saloon door is released, then opened … how long will it remain open?

A

1 minute

32
Q

If the master key is withdrawn from the key switch, how long will doors 1,2, 5 & 6 remain open for?

A

10 minutes

33
Q

If the doors are obstructed how many times will they attempt to close again?

A

In total 4 times at 3 second intervals

The first time they will fully open

Subsequent times they will close against the obstruction, then release

Finally, they will remain touching the obstruction but remain released

A beeping tone will sound for 60 seconds

34
Q

What do you have to do if doors failed to close?

A

Release doors, and try again

35
Q

What does the Door Loop bypass key switch allow?

A

In the event of FDCL, setting to Bypass allows traction so the train can be moved.

36
Q

Can you turn the Door Loop Bypass key back to the normal position?

A

No. Only maintenance staff

37
Q

Where are the external Emergency Door Release?

A

Doors 2 and 5 of all cars
Doors 1 & 6 of Mc’s

38
Q

What is the normal position of the lug?

A

Horizontal

39
Q

Where are the internal Door Emergency Release handles located?

A

Doors 2 & 5

40
Q

What happens when the DER is activated? (6)

A

FDLC

Door can be manually opened or closed

Traction power available until train stops

CCTV camera activates near DER handle

ANSW red button on drivers console will flash

The DOOR EMY HANDLE ACTIVATED status light will illuminate

41
Q

How do the communication doors open and close?

A

Manually opened

Automatically closed

42
Q

When does emergency lighting become operative?

A

If Battery Charger fails for longer than 1 minute

43
Q

What positions does the Saloon Lighting switch have?

A

1 - Normal - full lighting on both sides

1/2 - Reduced to emergency lighting on one side of the car and normal on the other side

0 - Emergency lighting - one light above each door

44
Q

How can you reset the timing cycle on VICERS?

A

Whistle

MCH

Acknowledge Button

45
Q

How long will the VICERS light flash for?

A

5 seconds

46
Q

How long will warning tone sound for?

A

5 seconds

47
Q

If the VAV is activated how do you reset VICERS?

A

Bring train to stand for 10 seconds

MCH to Coast

Observe Emergency Brake Applied light illuminated

Push VICERS acknowledge button

48
Q

What state does the train have to be in to test VICERS?

A

Vigilance key switch in OPERATE position

Cab activated

Trip lowered and set

Train @ 0kmh

Hand or foot pilot valve set

Emergency Brake Released

49
Q

If Safety Loop or any Auto Vigilance systems have been bypassed, what should you do to VICERS?

A

Set VICERS key switch to ISOLATE to reduce distraction

50
Q

Where are the Speed Sensor cables located?

A

Wheels 4 & 8 on Tp

51
Q

Which cable is the Speed Sensor cable?

A

T for TACHO
T for Top cable

Xtrapolis Traction (12 decks)

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