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what is the industry standard for determining polarity by KVA rating and primary voltage
200KVA and smaller with a primary rating of 8660V and below will be rated additive. all others transformers will be subtractive
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when facing a transformer with additive polarity, where is the X1 bushing in relation to the X2 bushing
X1 is on right
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why is the nameplate considered the most important part of a transformer
it provides technical information to the lineworker that can be used to safely install the transformer
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name 7 important items of information found on the nameplate of a transformer
weight; primary voltage; secondary voltage; impedance; serial number; schematics; KVA rating
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what radiates heat from the transformer case into the atmosphere
the circulation of insulating oil by heat is called convection
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how does the secondary coil become energized when the primary coil of a transformer is energized
the process of induction
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transformers are referred to as
machines with no moving parts
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name the three main internal components of a transformer
core; windings; insulating fluid
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what four letters are used to designate the ends of the secondary windings of a typical overhead transformer providing 120v/240v
A,B,C,D
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when facing an overhead transformer where would you find the H1 bushing
left side
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what protective devices does a CSP transformer have
primary current limiting fuse; secondary bushing circuit breaker
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what is the order of secondary bushings on an additive transformer or an subtractive transformer
- additive: X3, X2, X1
- subtractive: X1,X2, X3
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when facing an overhead transformer where are the H1 and H2 bushings always located, weather conventional or CSP
H1 left, H2 right
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what are two instances when you would operate the pressure relief valve on a transformer
pop the top, pull the bayonet fuse on an underground transformer
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what do we call the X2 bushing on a transformer
neutral
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three types of underground transformers
pad mount; vault; submersibles
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what is the primary bushings on a underground transformer labeled
H1A, H1B
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what does the bayonet fuse de energize on an underground transformer
secondary bushing
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when banking transformers together, what is the total rating of the bank
equal to the sum of the individual transformer KVA rating
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what does the core of a transformer consist of
thin lamination of grain oriented silicon steel rolled into layers with a coated with insulating material
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primary and secondary windings operated how; wire size
primary induces voltage on the secondary, consists of smaller wire; secondary windings delivers the output voltage to the consumer consists of larger wire than primary windings
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acronym for paralleling transformers
Alley Cat Bad Dog
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what type of oil is used in transformers
mineral
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when will the internal pressure release valve vent
when the internal pressure reaches 10lbs
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what material is used for the windings of a transformer and why
copper; low resistance and superb conductivity
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wires that connect externally and transmit power from the secondary bushing to the load
Hot legs, X1 and X2
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a transformer has only one primary bushing, how do you connect the transformer
phase to ground (WYE)
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which type of transformer is said to be the most versatile
phase to phase or phase to neutral
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what is a WYE secondary voltage
120/208
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looking at the secondary windings as you are facing the transformer, how are they labeled
A,B,C,D
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why do we parallel secondarys
to maximize KVA
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phase to ground connection is considered
WYE
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