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Traction > X’trap ELECTRICS > Flashcards

X’trap ELECTRICS Flashcards

1
Q

Where does the high voltage system pass through from the Pantograph?

A

Through the :
1. protection devices
(lightning arrestor, 2 HSCB) then
2. Line Inductors on the Mc cars
3. Traction container (where it is split)
4. ➡️1500vDC to AUX Cont (SIVS on Tp car) to be inverted 400vAC for AUX equip on Tp car. This also powers the Batt. Charger which transforms 400vAC to 123vDc for train lined control circuits & batteries;
& ➡️Traction Inverter to be inverted to Variable 3 phase power for the traction Motors

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2
Q

High voltage equipment comprises of?
(Equipment that uses up to 1500vDC)

A

Pantograph
Lightning Arrestor
2 HSCB
Line Inductor
Traction Inverter
Rheo Brake Resistor Grids
Aux Inverter (SIV)

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3
Q

What power do Traction motors operate on?

A

The 4 traction motors (1per axle) on Mc cars, use 3 phase Variable AC power. They are driven by the traction Inverters

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4
Q

How much power do the traction inverters supply to the traction motors ?

A

VARIABLE 3 PHASE POWER SUPPLY

Because the amount of power is dependent on the position of the Master controller Handle and also determined by the TCU

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5
Q

What is the job of the Line Inductors?

A

They filter the overhead power to provide a steady smooth power supply to the traction motors

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6
Q

Why is Variable 3 phase ‘VARIABLE’ ?

A

Because it needs to vary speed

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7
Q

What happens to the excess AC electricity produced by the traction motors?

A

It goes to the resistor grids to get cooled with the airflow on the roof

(Input to traction motors is 1500vDC but it is variable when power is returned back up to RG’s)

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8
Q

Which items are ‘PERMANENT LINE VOLTAGE’ i.e. powered by batteries (can operate even when Pantos are not up)?

A

Step light
Cab fluoro light
Panto motors

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9
Q

How are the pantos raised on an X’trap?

A

Electrically

They are raise automatically when the Master Key switch is ON, providing that 110vDC Permanent Line Voltage is present from the charged Batteries

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10
Q

What is the purpose of the lightning arrestor?

A

It protects 1500v DC circuits against transient over voltage

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11
Q

What is the purpose of the HSCB’s?

A

They close and supply 1500vDC to Traction Inverters once train is prepped. If a short circuit occurs within the train or overhead they will trip

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12
Q

What is the job of the Traction Control Unit ?

A

It tells the Inverter what level of power to send to the traction motors

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13
Q

How does the Traction Control Unit determine the appropriate amount of power to send to the traction motors?

A

It acquires info on the state of the traction equipment, commands, speed & weight. It also detects wheel slip and may cut power to axles with wheel slip

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14
Q

What controls the ED braking of the train?

A

The TCU.

The ED brake Module consists of 2 modules connected to the 2 roof mounted ED Brake Resistor units

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15
Q

What are the 2 positions of the High Voltage supply switch?

A

Power supply
Earth

Drivers can only view to check it is in a vertical position

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16
Q

What comprises the Low Voltage System?

A

Auxiliary Inverter (it inputs 1500 but outputs low voltage)
400/220 v AC System
110 v DC System
24 v AC/DC System
Batteries
Air Con

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17
Q

What is the power of the high beam Headlights?

A

24 v AC

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18
Q

What power operates the GPO’s?

A

220vAC

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19
Q

What power operates the Air cons and traction cooling fans?

A

400 v AC

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20
Q

What power operates the compressors?

A

400 v AC

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21
Q

What power operates the batter charger?

A

123.6 v DC

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22
Q

What is in the Auxiliary container ?

A

2 static Inverters (SIVS)
And 1 battery charger

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23
Q

What happens if one of the SIVS shuts down?

A

The SIV system can operate in a degraded mode as the other SIV will supply to all essential equipment except for only 1 air con and 1 compressor

The train can be operated normally

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24
Q

What power does each SIV produce?

A

400 v AC

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25
Q

What power is produced by the Battery charger?

A

110 - up to 123.6 v DC

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26
Q

What equipment do the SIVS supply power to?

A

Battery charger
Air cons
Air Compressors
Traction Converter cooling fans
110 v DC System (HVAC Control circuit power)
400/220 v AC system (GPOs)

BAATH G

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27
Q

How long does the battery charger have left to run when it loses it’s power supply?

A

1 hour

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28
Q

How do all 3 cars get their low voltage power?

A

From the Aux Inverters, each 3 car unit has its own self contained low voltage system

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29
Q

What are the major components connected to the 400 v AC system?

A

Battery Charger
Air compressors
Traction Converter cooling fans
HVAC

BATH

30
Q

What power are the roof mounted HVAC units provided with?

A

400 v AC for primary power
110 v DC Control Circuit Power

31
Q

What are the 3 distribution lines of the 110 v DC distribution systems?

A

Permanent Low Voltage line
Prepared Low Voltage line
Prepared Low Voltage and Cab Operative line

  • each corresponding to a different operational state of the train.
32
Q

What is the Permanent Low Voltage Line
Permanently connected to and what does it supply power to?

A

*Power from Batteries only (when no overhead connection)

Permanently connected to the batteries to electrically raise the panto and operates the

Panto Electric Motor
Step lights
Fluorescent Cab light

33
Q

What is the minimum power required to raise the panto?

A

90 volts

34
Q

What is the Prepared Low Voltage and cab operative Line and what does it operate?

A

It is energized in each car, by local switches, once the key is in and on and panto has been raised.

It operates the following 110 v DC equipment:

Panto operation
Status and Fault indications
Traction control
Braking control
Door control
Safety loop
Communications
Emergency Saloon lighting
Normal lighting

PTSD. NEC. BS

35
Q

Can prepared Low Voltage Line continue to function even if controller key is removed?

A

Yes. Once controller key is removed, the train remains in a prepared state by means of the PREPARED LOW VOLTAGE LINE being energized.
As long as you have not cut in another cab.

36
Q

What functions does the PREPARED LOW VOLTAGE LINE energise ?

A

Once key is removed:
Train remains prepared
Panto remains raised
Settings of last cab in service are memorised
(Marker lights, doors & saloon lights)

37
Q

Can a driver be asked to touch or operate the Battery switch ?

A

No they can only be asked to check its position

38
Q

What do the batteries do?

A

The batteries are only used as back up and energize the Permanent Low Voltage train line only when the train is stabled and can also supply 110 v DC power during train rescue.

(During normal operation the Battery Charger is used)

39
Q

What is the SAFETY LOOP?

A

An electrical circuit that connects Safety Critical components to the Emergency Brake System.

If any of the pneumatics have a significant drop in pressure the pressure switch will open and the safety loop, causing Emergency Brakes to apply.

40
Q

Which circuit breakers protect the Safety Loop?

A

Safety loop positive 23QI
Safety loop negative 23Q2

41
Q

What are the components of the Safety Loop?

A

EMY STOP button 🛑
Vigilance devices
Trip
EMY position of the MC handle
The monitoring pressure switch in Main Res pipe (Tp)
The Monitoring pressure switch in the Brake Pipe (Tp)

42
Q

Under which circumstances will the EMY brake apply? (11 answers)

A

Main Res pressure falls below 580

Brake Pipe pressure falls below 300 (during rescue)

Trip cock device is raised or activated

When Hand/ foot vigilance devices not set OR

EMY auto vigilance button not pressed w/in 40s while using vigilance bypass

Activation of VICERS

When a loss of 110vDC (when we have flat batteries)

MC is placed in EMY in manned cab

EMY stop button pressed in any cab

When more than 1 MC key inserted simultaneously

If 23Q1 &/ or 23Q2 trip in lead cab

43
Q

How do you reset the trip?

A
  1. Train speed below 0.5km speed threshold
  2. Train stationary for minimum of 5 secs
  3. Place trip cock device to reset and release
  4. The trip activated light will extinguish when reset
44
Q

What do we do if trip reset fails via in cab switch?

A

Check the manual reset button on top of the trip valve as well as the reset Iso cock in the Aux pneumatic panel.

45
Q

How is the Safety Loop tested?

A

Set the hand pilot valve to SET
Set the Safety Loop bypass switch to test

46
Q

What must we ensure and be aware of when operating on Safety Loop Bypass?

A

We must first detrain passengers
We have no safety devices on the train

(If we need to use EMY brakes we must release the bypass switch)

47
Q

What are the 2 positions of the safety loop 110v supply switch?

A

NORMAL
RESCUE

48
Q

Where are the 110 v DC motors to each saloon door?

A

To the left of each door. Each door has its own door control unit.
Door one motor is in driver’s cab

49
Q

What are the components of the Passenger saloon Access doors? (4 ans)

A

Passenger activated Door Release buttons
Bi-parting sliding doors
Electric motor
Door Control Unit (DCU)

50
Q

When a driver stops at a station, releases the doors, the push button will illuminate yellow. If the door closed light remains illuminated steady blue, does the driver still need to lock the doors prior to departing the station?

A

Yes, as the doors are still released.

The steady blue light is still illuminated as no passengers exited the saloon.

51
Q

How long will the saloon door remain open for?

A

1 minute.

They can be reopened any time as long as driver has not pressed door closed button in the cab.

52
Q

How long will doors 1,2,5 & 6 remain open for in the leading motor, if the driver removes the MC key ?

A

10 mins

(To assist special needs passengers)

53
Q

What is the secondary release feature?

A

When doors are attempting to close when there is an obstruction.
The doors will attempt to close 4 times (at 3 s intervals).
If obstruction is not removed by the 4th attempt the doors will remain touching obstruction but released and a beeping tone in saloon will sound for 60 sec

54
Q

What is the door loop bypass and how does it operate?

A

Its in the cab circuit breaker cabinet. It allows traction where a FDCL cannot be rectified.

Once Bypass switch is turned to ISOLATE using the key, the FDCL will continue to flash regardless and the key cannot be returned to the NORMAL position

55
Q

How can doors be released externally?

A

Using a tri key on doors 1,2,5 & 6 of Mc cars and doors 2 & 5 on Tp cars

If tri key switch remains in vertical position the FDCL will flash continuously

56
Q

How are the doors manually released internally?

A

On motors & trailers doors 2 & 5 using the red DER handle.

(The tri-key door release switch underneath is normally horizontal and this will return the DER handle to NORMAL after DER handle is pulled to release doors)

57
Q

What will occur when the DER is activated?

A

Door close BLUE light will flash
Doors can be opened or closed manually
Traction power still available if in-running until train is stopped.
CCTV of that area will be activated
The ANSW red button will flash on drivers console
The DOOR EMY HANDLE ACTIVATED status light will illuminate

58
Q

What is the Lighting System made up of?

A

Passenger Saloon lighting
Emergency lighting
Cab lighting (110 & 24 vDC)
Step lighting
(All 110 v DC)

59
Q

When does emergency lighting become operational?

A

When battery charger fails for longer than 1 min

60
Q

What are the 3 positions of the Saloon Lighting selector switch on the Aux Panel?

A

1 - NORMAL
1/2 - REDUCED to EMY on one side & normal
lights on other side
0 - EMERGENCY lighting (one saloon light
above each door)

61
Q

What does cab lighting consist of?

A

1 fluoro tube
1 spotlight (24vDC)

62
Q

When does the cab door step lighting illuminate?

A

When cab door is opened

(Provided there is overhead OR if no O/H then through battery on Permanent Line Voltage line unless the batteries are flat)

63
Q

How can VICERS be reset after its been activated?

A

Bring train to a stand for 10 sec
Put Master Controller into Coast
Observe the EMY brake applied light is illuminated

Driver can now push VICERS acknowledgement button to reset EMY brake application

64
Q

How can a driver test the VICERS during a train prep ?

A

Driver must ensure:

  • Vigilance key is in the operate position
  • Cab is activated
  • Trip is lowered and set
  • train speed 0 km /h
  • hand & foot Pilot Valve is set
  • EMY brake is released
    THEN INSERT BLUE VICERS KEY turn clockwise (key released) to start test

During test driver should observe:
- safety loop will open twice
- acknowledge button will flash and audible tone heard
- VICERS fault light will illuminate then extinguish
- EMY brake cylinder pressure will be displayed acc. to pos. Of Safety Loop

If VICERS fault light remains illuminated test has failed and it must be isolated and reported to TC & TMM

65
Q

When must VICERS be isolated?

A
  • When VICERS test fails during a prep
  • When Safety Loop or any Auto Vigilance systems have been bypassed
66
Q

How can the speed threshold be overridden?

A

By breaking the Tacho Bypass switch seal and set the switch to By-Pass

67
Q

What is the SPEED THRESHOLD ?

A

Speed threshold is 0.5 km/ h it is trainlined and energized by a relay output from the Data Recorder

68
Q

What functions use the SPEED THRESHOLD?

A

DUST

D = Door RELEASE
U = Uncoupling (uncouple button)
S = Safety Loop Reset (after reduction in BP pressure during a rescue)
T = Trip Cock Reset after activation (must be stationary for 5 sec to reset trip)

(Steve said also VICERS as you need to be stationary to reset that)

*If speed threshold becomes defective the above functions may become unavailable

69
Q

What 2 lights are illuminated on the cab fault light panel in a non-active cab?

A

HIGH VOLTAGE PRESENCE
OTHER CAB OPERATIVE

70
Q

If. DER is in the horizontal position on the outside of the door, how will we know?

A

There will be a FDCL will flash continuously

Traction (32 decks)

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