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What type of extinguisher should you use for an electrical fire ?
Type C (dry chemical)
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Where should you you discharge the fire extinguisher?
At the base of the fire.
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define pantograph
It makes contact with the catenary, sits on top of the train.
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Who do you notify when you see a damaged pantograph?
P.D.
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how should you work when working on circuits above 480V?
You need a clearance
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When is a clearance needed, above what voltage ?
Above 480 volts
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Define impedance bond:
It seperates rail return from signal power.
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How must you consider a broken lead on an impedence bond?
energized dangerous to life.
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What is the input signal breaker called ?
the 52 breaker
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What is the voltage and cycle at the 152 contacter/breaker?
480V / 100 HZ
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What is the output of amtraks signal machines/MG set, voltage and cycle?
480 V / 100 HZ
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What are the copper segments on an MG set called?
commutator
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What is the purpose of an MG set /battery charger?
To charge the batteries.
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Define trip free:
Doesn't allow circuit to be closed as long as fault exist.
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define lockout:
Has to be manually reset .
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Which two relays can take the bus section out during a fault?
JD & CA4
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What relays work in conjunction with the CA relay, and what type of relay is the CA?
CA is the Internal fault relay, works with the MC
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What needs to be done to a 4500kva transformer when it trips out on CA?
Dolbe test
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What do the laminations in a transformer create ?
Magnetic Flux
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What is mutual induction ?
Primary of transformer induces voltage on secondary
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What type of gas do we use to fill the void in our 4500kva transformers, and why do we use this gas?
Nitrogen oxide
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At what voltage are we permitted to use a swithc pole when energized?
what if any equipment should be worn?
12 KV
Rubber gloves
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At what voltage should you wear high voltage gloves?
175 volts and above
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How do you test your rubber gloves?
air test, strecth, inspect every 90 days.
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How many persons are permitted to work on a ladder?
2
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What is the input and output voltage of a heater station?
input 12kv output 480V
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What is the main breaker of a heater station rated at?
1200 amps
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What is the purpose of a bus potential transformer, and what is it rated at ?
feeds the relays ( bus reference )
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What polarity is this : H1, H2, X1, X2
subtractive
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What is the turns ratio of a bus potential transformer ?
100 to 1
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What size fuse do we use on the secondary side of a bus potential transformer?
6 Amps
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What is the turns ratio on a 4500kva transformer?
11 to 1
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What will the power director do if he gets an over temperature alarm on a transformer?
Trip the low side
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What is it called when you seperate a breaker from its source ?
Rackout
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When is it safe to work on a circuit or apparatus ?
when it is deenergized & grounded
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How many Volts and amps are our vacuum trolley breakers rated at?
35 kv 1500 amps
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When using oxy/acetylene both lines should be equipped with what?
What safety equipment should you wear?
Flow check valve
Gloves, eye protection and chaps
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Define bus jumper:
cable or jumper used to transmitt power from one piece of electric equipment to another.
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Define control jumper:
A cable or jumper mechanically connected to electric equipment to transmit control power.
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At what voltage do you use a tic tester?
480V & above
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What is turns ratio?
number of turns from primary to secondary
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What is the input of a transformer referred to?
applied
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What is the designation for a 100 cycle transformers secondary?
X-Y
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Which relay protects our 4500kva transformers from line to ground?
CO balance
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What is the difference between synchronous speed and full load speed of a motor ?
slip of the motor
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What prevents a signal breaker to reclose?
230 - lockout
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What print do you use when wiring up a CR relay ?
IB prints & R and C prints
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The JD relay can also be operated by what transformer relay?
CR and CO backup
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Define thermal relay?
Works with expanding bi metal
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When flash testing transformer oil, what is the di-electric value thresh hold?
26 kv
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What can occur if you open an energized CT circuit ?
unlimited potential
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What alarm will the power director get when the transformer indicates over temperature?
Bell temp alarm ( BTA)
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What do you do after a clearance has been issued and the circuit tests energized?
check tic tester settings and retest
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How do you isolate 4500kva transformer ?
open the H and the L
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Before you work on substation rail return, what must be done first?
ground and jumper
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What is the purpose of oil, in an oil circuit breaker ?
Disapate the arc
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Why does the power director open the low side breaker before the highside?
Cant open the H under load. Break the circuit, remove the load.
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does a megger generate AC or DC voltage, and what setting do we normally use for control cable ?
DC voltage/ 500 volts
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