Relay Interlocking > Study > Flashcards

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1
Q

What is an ALSR

A

Approach lock stick relay.
Holds locking if signal placed normal infront of a train

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2
Q

When can ALSR be removed

A

When track/s proven to be clear or train proven to be stopped

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3
Q

What is back proving

A

Proving that one relay has de-erergised before permitting another relay to energise.
This is a fail-safe operation, as it two relays in a back proving ciluit are both energised, it will not clear that circuit.

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4
Q

The interlocking must ensure what 3 things

A

-conflicting or opposing routes cannot be set
- Points are only moved when it is safe to do so.
-Signals only clear when safety
conditions are met

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5
Q

Define AC immune relay

A

can operate in an area with AC traction but will not respond to an induced AC voltage.

QNA1

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6
Q

Define a biased relay

A

Only operates when current is flowing in one certain direction

QBCA1

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7
Q

Define slow to pick up relay

A

Has a time delay between coil energisation and contacts opening/closing

QSPA1

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8
Q

Define a slow to release relay

A

Delay between opening of a control contact and a release of a relay. Eg signal head circuits changing aspect

QSRA1

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9
Q

Define a magnetically latched relay

A

2 coils which operate independently. Remain latched in last position until energised in opposite direction. Has a permanent magnet

QL1

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10
Q

Define a time delay relay

A

Has a delay between opening of a coil contact and subsequent release of a relay. Has a timer and power supply.

QTD4

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11
Q

Define a slow to release relay

A

Delay between opening of a control contact and a release of a relay. Eg signal head circuits changing aspect

QSRA1

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12
Q

(F) R

A

Button pressed

Repeats push button operation

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13
Q

(FM) R

A

Button pulled

Provided for emergency replacement of signal (cancels route)

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14
Q

(R) PR

A

Button reverse (pressed) repeat relay

To ensure only one button pressed at a time. operates commence and finish relays.

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15
Q

CeR

A

Commence Relay

Defines and initiates route to be set.

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16
Q

FnR

A

Finish relays

Defines end of route, in conjunction with CeR sets route

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17
Q

MuR

A

Machine In use relay

Operates when commence relay is up to make next button a finish

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18
Q

FnPR

A

Finish repeat relays

Initiates timing sequence to remove route call

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19
Q

FnJR

A

Finish timing relay

Provides timing sequence initiated by finish function

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20
Q

FnPR

A

Finish repeat relays

Initiates timing sequence to remove route call

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21
Q

FnJPR

A

Finish timing repeat relay

Provides timing sequence initiated by finish function

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22
Q

FnJP2R

A

Finish timing repeat (number 2) relay

Provides timing sequence initiated by finish function

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23
Q

(N) R

A

Normalising relay

Normalises route

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24
Q

TZR

A

Track special relay

Guarantees integrity of automatic normalising path

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25
RUR
Reverse route relay Picks when route is set, calls points to the correct position
26
NLR
Normal lock relay Main interlocking relay. Indicates when route is normal.
27
SR
Lever stick relay Prevents signals automatically releasing after trains
28
UCR
Route checking relay Checks all tracks & points detection for signal controls.
29
NGPR
Signal normal repeat relay Proves signal and train stop is normal
30
RGKR
Reverse signal indicating relay Indicates signal cleared
31
ALSR
Approach lock stick relay Holds locking if signal placed normal in front of train
32
ALSJR
Approach lock stick timer relay Times out approach locking
33
USR
Route stick relay Holds locking after train enters route
34
TJR
Track timing relay Track timing to release route locking or conditionally clear signals, depending on application
35
POJR
Power off timer relay Disconnects quick release path in approach sticks and TZR to retain locking during power failure
36
What is the purpose/function of the RUR and the (route) NLR?
work in a pair; RUR can only be picked when the NLR is down (route is normal). This is to ensure there are no conflicting movements / routes. Releases opposing moves when driven up. RUR - to call the points to correct position and allows entering signal to clear.
37
What is route locking
Usually energised with signal at stop. It will de energise when signal is cleared and thereby apply route locking. To de energise relay signal will have to be at stop and train travelled through and left. OR moved part way through and be proven to be stopped
38
What is RSR
Route setting relay. Governs the setting and locking of relevant points and clearing of associated signals (sets route). Has a relay for each desired route.
39
(N) R
Normal relay Repeat’s point lever position
40
What is RSR
Route setting relay. Governs the setting and locking of relevant points and clearing of associated signals (sets route). Has a relay for each desired route.
41
(R) R
Reverse relay Repeats point lever position
42
(C) R
Centre relay Repeats point lever position
43
UNR
Route normal relay Cancels route when button is pulled
44
NZR
Normal setting relay Sets points normal when route is called
45
YR
Disengaging relay Calls section control when setting route into single line section.
46
NZR
Normal setting relay Sets points normal when route is called
47
DDSR
Down direction stick relay Proves train travelling in down direction
48
DSCR
Down section control relay Checks section clear for down train
49
What does a geographic module consist of
Relays, fuses, plug couplers, associated apparatus. In a frame and wired
49
DSCR
Down section control relay Checks section clear for down train
50
ARTC steps to change a magnetically latched relay
Prepare IBA, procedure, inspect relay to be changed, contact NCO and complete IBA. Replacement Relay must be placed in test base and be driven down. Faulty relay must be driven down, unplugged and quarantined. New relay must be function tested with NCO.
51
Appropriate action if contact resistance is >2ohms
May be able to be cleaned by cycle testing @ full rated current. If is <2 can be used. If not must be sent away for cleaning and maintenance.
52
ARTC steps to change a magnetically latched relay
Prepare IBA, procedure, inspect relay to be changed, contact NCO and complete IBA. Replacement Relay must be placed in test base and be driven down. Faulty relay must be driven down, unplugged and quarantined. New relay must be function tested with NCO.
53
Visual inspections on relays
Seals in tact, cover and base not cracked or warped, plug in contact fingers not bent or burnt, no sign of overheating, ensure plastic cover not fouling contact assembly or misalignment, no corrosion, no loose or foreign matter inside, cover still transparent.
54
What is silver migration
The movement of silver ions onto and through isulation materials, penetrating into the structure of the material. Caused from silver, moisture and potential difference
55
Visual inspections on relays
Seals in tact, cover and base not cracked or warped, plug in contact fingers not bent or burnt, no sign of overheating, ensure plastic cover not fouling contact assembly or misalignment, no corrosion, no loose or foreign matter inside, cover still transparent.
56
Potential consequence of silver migration
since it is conductive, it could bypass contacts in the circuit and introduce connections between different circuits.
57
Function test
To verify that the fuses, links and controlling devices are effective in controlling circuit. Required to ensure end function will energise/ de energise as expected and when fuses are removed and when controlling devices change state.
58
Circuit strap and function test
Proves circuit function energises / de energises when its control devices change state and when fuses / links removed. Individually proves specific contacts is effective
59
Circuit strap and function test
Proves circuit function energises / de energises when its control devices change state and when fuses / links removed. Individually proves specific contacts is effective
60
Through circuit test
Tests completed circuit over outgoing/ incoming cable links and verify correct correspondence. Verifies fuses links and controlling devices are effective.
61
Through system function test
Tests correspondence from initial input to final output for controls and indications combined
62
Function testing to control tables
Carried out on an interlocking simulator or the control panel. Trains are simulated to function test interlocking controls set out in control tables.
63
Design integrity (principle)
Carried out after all other tests to ensure design conforms to required signalling principles and practises.
64
What’s OCS stand for
One control switch
65
What’s OCS stand for
One control switch
65
What does NX stand for
Entry and exit
66
OCS primary relay
RSR
67
OCS primary relay
RSR
68
What relays energise after the commence button is pushed
(F)R, (R)PR, CeR
69
What relays are energised after the finish button is pushed
(F)R, (R)PR, FnR
70
In the points calling circuit, is the route NLR is driven down, which relay will be energised?
RUR
71
What does the route NLR latched up prove
Releases conflicting moves, proves the signal has returned to stop, signal is not approach locked and route RUR is de energised.
Relay Interlocking
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