Card Set Information
Assistance study guide
Class of fires
A- wood= water
B- flammable liquid = foam dry chem
C- electrical = co2 or dry chem
D- combustable meatel = dry chem
What are heat strips in bkrs for
What does cc stand for
Where are ct's located
Mostly on bottom of bushishing to measure current
Dc current from low voltage test set
How many conductors does a clamp on ammeter measure?
One at a time
On a transformer if current is higher is on the secondary side?
It is lower on the primary
A center punch is used?
To start a hole
Who holds a work permit for contractors?
E.I work with contractor. Operators inspect the work b4 they sign off the work permit
AC to DC
A float is a?
An equalizer is a?
High charge to bring up battery volts
A load tap changer can
Be changed under load
A no load tap change must?
Be de-energised to change taps
Extinguish the arch at
Current zero (AC hits current zero twice per cycle)
Bkr trip coil energized
Green light signify?
Bkr closing coil is energised
Amber light signify?
Air or gas psi is present
Whit light signify
Red pipe (now orange)
Normal psi on FDR
Dc used for
Control, indications, alarms, relays
Ac used for
Light and power
Check sensitive button on the test stick
Before you touch conductors
You connect and ammeter in
You connect a volt meter in
Paralle (across the motor)
A wattmeter measures
What measures ohms, voltage and current?
A megaohm meter measures
High resistance like insulators inside a transformer
A micro-ohmmeter measures
Minute resistance( like the kind between electrical contacts ) you can use a fluke or Simpson 260
What is atmospheric pressure
What measures vacuum and psi
A compund gauge
Hammer used to shape metel is
A ball peen hammer
Starts fire pump ,gives fire alarm and opens the clapper
Thernostat supervisory loop (normally energized)
Monitors clapper, gives alarm (normally energized)
Permissive control switch/ mechanical switch
Air or gas psi
Changes DC to AC for phone and walkie talkie
A ct must be stored
Shorted it will energise itself or pick up a charge from ambient electric
To test fluid in a battery
Use a hydrometer (never use a hydrometer in a diesel it is nickel-clad and will explode)
Hard hat, safety shoes, fire retardant covralls, face shield (goggles) earplugs, gloves, rubber gloves, and gauntlets
When first checking rubber gloves?
Check voltage rating and date
Batteries in series?
Amps stay the same and volt increase
Batteries in parallel?
Volts remain the same and amps increase
When an LOR (lock out relay) trips what do you look for
When working on a pothead you must
Reduce psi and de-enerdize FDR usually for retorking pots
When doing pothead inspection look for
Box end wrench has how many teeth
6 to 16 teeth. The fewer the teeth the strong the werench
Distance relay is
Fault protection for feeders by zone
Audio tone is a form of
Who wears the white hard hat in an emergency
The highest operating authority
What regulates pressure in a pump house
The relief valve is to insure
The system does not overload
Celsius to Fahrenheit
1.8 x Celsius + 32
Fahrenheit to Celsius
Fahrenheit - 32/1.8
Step down transformer primary side has 10,000 windings secondary has 1,000 what is the ratio
Ten to one
Step down trans. Primary voltage 24 volts secondary 4 volts so its a?
Six to one voltage difference
High speed ground switch operates in
3 to 5 cycles
Where would an inspection of a throw over, clapper, tampper switch be?
The muffler room (deluge), mulsyfier room
Who resets the clapper?
What gas is in the mini Bus?
What is the insulation in a wetinghouse 138 (ocb) bushing
Wavetrap takes teansfer trip single off?
White powder on sf6 mini bus is
The gas given off by batteries
If u get sulfuric acid in your eyes
Use eye wash to get it out
Casp bkr opens by
Spring open air closed, air dielectic
Another name for polla is
Dunwoodie is What kind of station
Bulk power has transmition and distribution
Tap changer used for means of
Parts per million reading for air gas and oil samles
Individual action tracing current. Used to identify pases 1 beat posative A, 2 beats pos B, and return neg C
continuios action tracing current. Test to see if fdr has blown clear
Diesel gen is used for
Back up power upon loss of normal AC supply
Fire zone indication unit
Closes and openes when needed
Nitro is used to
Keep moisture out of oil
Ac load board
Main supply for station light and power
Dc load board
Used for controls indications alarms and relays
Station total load =
Total mega watts
Limits fault current
Used for voltage control.... Dummy load....opposite of capacitors
It is a fact that all devises in a paralle circuit operate at the
The total current in a parallel circuit =
The sum of The currents in the devices
Con Edison load peaks in the summer is about?
the function of a transmission station is
To transmit power over long distance
The function of a distribution station is
To maintain uninterrupted service to the customer in the most cost effective way
the role of a sub transmission station is to
transmit power from transmission station to distribution station
A transmission station steps power from?
transmission voltageg to sub-transmission voltage
An area station steps power down from
sub transmission votage to primary distribution voltage
the interface from overhead and underground systems is at?
Dunwoodie and sprain brook
the whole eastern interconnection has the total electric load of?
About 300,000 Mw
Generating units throughout the inteconnection responds to immediately to the temporary shortage of energy by?
increasing there output
if mw exceeds mw demand?
frequency rises and vice versa
the normail frequency of electric supply throughout the united states is?
the frequancy of a power system must be maintained at a very narrow band between?
59.95Hz and 60.05 Hz
if at any time the utility system does not have enough energy to meet its load?
Energy will be sucked in from the neighboring system
cooling plant is used for?
dissipating heat from oil FDR's
What is a beackfeed sensing device?
When the G&T is closed and the CT,s reed .75 milliamps it will prevent the G&T from closing in on a live source
Work is = to
Force * distance
What should you never use ase a form of light when checking the elecrolyte level?
A match. Hydrogen and oxygen mixed together are highly volatile. the area used for redharging must be well ventilated
Can you disconnect leads to a battery while it is charging?
No. , the spark the occurs at the terminals may ignite and cause an explosion.(the negative lead should be connected to the frame instead of the terinal)
how are batteries rated?
in voltage and amp hours capacity
data for use in carging a battery is found on its?
The instument used to detemine specific gravity is the
Should you charge a battery to definite specific gravity?
No, maintain the charge until the same specific gravity reading is indicated at three successive half-hour intervals.
at 68 degrees F, the resistance of a mil-foot copper wire is approximately
CSA formulas (cross-sectional area)
the resistance of a copper condutor is inversely proportional to?
The cross-sectional area
A conductor has a resistance of 6 ohms. A conductor of the same materal and length but twice the CSA will have a resistance of
A conductor has the resistance of 10 ohms. A conductor with the same material but twice the diameter will have reseistance of
A conductor has 12 homs. A second conductor with the same material and cross-section are is 4 times as long, and has a resistance of
The csa wire is measures in
By mathmaatically squaring the number of mills in the diameter of a wire, the result is?
the cross-sectional area
the number of seperate conductors in a raceway or cable is a major factor in determining ?
the current-carrying capacity of the conductor
the greatest portion of the total circuit resistance is determined by?
the type of circuit arrangement and the load resistance
the kind of insulation on a conductor partially determines the condutors?
current carrying capacity
the resistance of an aluminum wire is directly proportional to?
the temp of the wire
name 5 factors the determine the total resistance of a circuit?
# & type of devices
The type of circuit arraement of the devices
Resistance of switching and control devices
Resistance of conductors carrying power to the devices from source
. internal resistance of voltge source
Name 4 factors which affect the restance of a conductor?
.Type of material
Length of material
CSA of the conductor
Temp. of the conductor
for a small line-voltage drop the resistance of line conductors should be?
A small pecentage of the total circuit resistance
When a permitted percentage of line voltage of line drop specified in a problem the value is computed from?
the source voltage
the voltage that is applied to a load is = to the?
Source votage minus the line voltage drop
line voltage drop is inversaly proportional to the?
cross-sectional area of the conductor
The 2 important general factors that must be considered when selectiong conductors are?
Permissible voltage drop and cost
Electrical psi is measured in
Electrical current is measured in
The symbol for resistance is
a greek letter (ohms)
An electrical current is the movement of
the symbol for source voltage is the letter
Resistance is measured in
The symbol for current is the letter
Electrical power is measured in
The symbol for electrical power is the letter
Electrical energy is measured in?
the resistance of a conductor varies directly with its?
the cross-section area of a wire is usually expressen id
the resistance of a wire varies inversely with?
Its cross-section area
the most frequently used conductor of electricity is?
in wire size tables, the diameter of a wire is expressed in
A wattmeter is used to measure
Electrical resistance is measures with an instrument known as an
Higher voltage is obtained by connection batteries in?
in charging a battery it should be kept on charge until?
there is no further increase in specific gravity
in charging a battery it should?
be kept on charge
to operate properly, electrcal devices parallel circuit must have the?
same rating with respect to voltage
to operate properly, electrical devices connected in series circuit must have the?
same rating with respect to current
the major part of the resistance in a correctly wired electrical circuit is usually found?
in the devices in a circuit
the simplest method of generating electromotive force is by?
turning a single loop of wire between 2 magnetic field poles
one cylce of alternating current is defined as that current that?
increases from 0 to a positive maximum returns to 0 then increases to a negative max and returns to 0 again
frequency in hertz
speed in r/mins
number of poles
the effective value if alternating current is that value which produces?
the same amount of heat as the same value of direct current
on the fire protection panel, the only light that is normally on is the?
on voltage reduction panel, under normal conditions what lights are on?
Transformers are AC or DC?
Phase angle regulators control the?
the direction of flow
the part of the transformer most sensitve to heat is the?
we use sphere gaps to protect us while performing all?
contact-making voltmerer controls?
the tap changer
ct do not have?
primary and secondary windings
dielectric strength determines how?
dielectric medium can withstand voltage
how many heaters are on the high psi sf6 tank?
when you have a series parallel circuit you must?
convert the parallel to a series device and then continue to your series formulas
Air circuit bkr
Motor operated disconnect
Oil circuit bkr
time delay open
time delay close
X & Y?
name 5 different types of protective relay elements
d. induction cup
e. solid state