Pole Transformer Glossary

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Two Bushing Transformers

Pole Mount Transformer
Description and details about Pole Mounted Transformers

Power Pole Transformer
What kinds of power poles are used currently.  The set up of a power pole and its various services it carries

Pole Transformer History
Background and development of the pole mounted transformer

Power Pole History
A synopsis of the development of the power pole and currently offered variations

European Transformers
Differences in European vs. North American electrical systems 

Transformer Facts
Basics of transformers and simple math for transformers

Pole Transformer Glossary
The most common terms you will encounter while reading about pole transformers

Pad Mount Transformer
The developmental history and details regarding pad mounted transformers.  Why they are more common

Other Transformer Types
Covers transformers for other uses and general descriptions of some of the main ones







Pole Transformer Glossary

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This Pole Transformer Glossary is not meant to be a complete list of terms you may encounter, but a helpful one encompassing the most often encountered ones in the field of transformers and pole transformers. 

Pole Transformer Glossary Basic Electrical Terms

Ampere, amp or amps (A or I)- unit of measurement for current, the amount of electricity flowing through a circuit

Volt (V)- unit of measurement for the force that pushes electrons through a circuit expressed in terms of 1A vs 1Ω

Watt (W)- a measurement of power; the measure of capacity for overcoming resistance to change measured over a given distance during a given amount of time expressed in terms of 1VA

Power (P)- the ability to do work (measured in watts); the capacity to create change over a given distance during a given amount of time

Current (A)- a flow of electricity or rate of flow through a conductor; measured in amperes

Conductor- a substance that readily conducts e.g. electricity and heat

Electricity- a form of energy, caused by the behavior of electrons and protons (certain parts of an atom––theoretically the basic building block of matter), commonly spoken of when referring to the flow or potential flow through a conductor

Kilo (k)- the metric term for 1,000

VA- the mathematical symbol designating the relationship between volts and amps that equals the power, or wattage of a power source; commonly seen in electrical references as kVA (since electrical systems deal in great magnitudes of power)  Since power, or wattage of a source is generally fixed, it is to be expected that when volts raise amps will fall, and visa-versa.

Resistance- the tendency of any conductor to resist change (currents or amperages) and inhibit flows of electrical power through a circuit made of this conductor; measured in OHMs

Impedance- same as resistance

OHM (Ω or R)- the unit of measure of electrical resistance expressed in terms of 1VA

Inductance- the property of an electric conductor or circuit that causes an electromotive force (emf) to be generated by a change in the current flowing

All transformers are dependant directly on this property to be able to function.

Reactance- the tendency to inhibit the flow of electric current brought about by inductance and capacitance (rather than resistance)

Capacitance- the property of a conductor allowing it to store a charge; this charge can influence the conductor's ability to pass a current when stored charges are present

Frequency- the rate at which a changing current repeats itself in a wave pattern over a period usually measured per second; often measured in Hertz (Hz); refers to the number of times an AC current voltage will alter between positive and negative and back within a specific period of time

In generators and power systems the most common occurrences are 50 or 60, also referred to as cycles.


Pole Transformer Glossary Basic Transformer Terms

kVA- designates Kilovolt ampere; the output a transformer can achieve at a rated voltage and frequency without passing a specified rise in temperature

Phase- classification of alternating current circuits referring to the fact that each phase is a flow created 1/3 of the distance around a rotating armature; their relationship being 0ْ or 120ْ

Transformers are most often single-phase or three-phase; each phase being one of the three electrical currents produce in a generator constructed with three circuits 120 degrees apart and each producing a current.  A transformer will generally have the same number of phases outgoing as ingoing.  Single-phase is most often used for residential and small business, while three-phase is for industrial, shop and heavy equipment installations that use motors and other devices designed for and most efficient when operated on three phases.

Primary Voltage- the voltage coming into the transformer; usually given in terms of a number value and vector

Secondary Voltage- that voltage as passing downline from the transformer

Vector- Though pole mounted transformers are usually single-phase, vector designations establish number of primary bushings and configurations possible in a three-phase bank. 


13200GY/7200 indicates a one-bushing primary, it is rated at 7620V and connections should be between one phase and the neutral of a 13200Y system.

Windings (N)- number of complete turns of wire around a core, whether air or metal

Bushing- an insulating liner in an opening through which conductors pass

Single bushing primaries are used in residential areas for single phase systems; two bushing primaries are mostly for three phase banks of three single phase transformers ganged to result in three phase power.

conventional refers to a standard two bushing primary; CSP (completely self-protected) refers to transformers that include a lightning arrestor, primary fuse and secondary circuit breaker.

Taps, or Tap Changer- connections which allow fixed adjustment for low or high incoming voltage; transformers are often fitted with a variety of taps that allow them to be set up quickly for a given common set of incoming and outgoing voltages.

Cooling Fluid- a fluid in which the transformer is immersed permanently and which protects it against moisture, corrosion, overheating and contaminations

Mineral oil is commonly used, but other fire resistant or biodegradable fluids are available at a higher costs when desirable for a given installation.


Pole Transformer Glossary

The above wheel accounts for all the possible combinations of computations normally used in figuring the missing quantities from existing quantities when working with the basic elements of electrical power.  The outer circle gives the two items to be computed to arrive at the item in the center circle.  Therefore, the center circle actually represents the "equals" portion of a formula.

Example of some computations

How to Select a Transformer


If you encounter any terms not included here, in this Pole Transformer Glossary,  please look them up in one of the fine online or printed dictionaries.  You may also ask one of our technicians to clarify anything you don't understand about the items you are asking about.

TEMCo carries a full line of Pole Transformers, with most products shipped within 24 hours.  They not only supply quality Pole Transformers, but also offer the lowest prices, so call on the team at TEMCo to provide your Pole Transformer and other electrical transformer products!  Find out why so many companies rely only on TEMCo!! 

CALL TEMCo for all your Pole Transformer needs!!
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Pole Transformer Glossary


A Three Phase Set-up

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