Transformer Haul

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TRANSFORMER TERMS AND DEFINITIONS

• Air Cooled - A transformer which uses air to cool by use of fans or normal ventilation.

• Alternating Current - An electrical current flow of continuously changing polarity, which rises to a maximum voltage in one direction, decreases to zero and then sinks to the maximum voltage in the other direction before changing polarity once again. This pattern is referred to as a sinusoidal wave and the number of cycles per second is equal to the frequency, which is measured in "Hertz".

• Ambient Temperature - The normal surrounding temperature of the environment in which a transformer will operate.

• Banked - Describes multiples single phase transformers connected together to provide power to three phase load.

• Core - The transformer's central part or inductor that enhances the power of the magnetic field.

• Core Saturation - A condition that results from a transformer or inductor reaching highest magnetic strength.

• Current Transformer - A transformer used in instrumentation to assist in measuring current. It utilizes the strength of the magnetic field around the conductor to form an induced current that can then be applied across a resistance to form a proportional voltage.

• Delta - In a three phase connection the windings all connect to form a loop.

• Delta-Delta - The connection between a delta source and a delta load.

• Delta-Wye - The connection between a delta source and wye load.

• Duty Cycle - Proportion of time for a transformer to provide full rated power to the load. This measurement really affects the actual size of the transformer.

• Electrostatic Shielding - A component that sits between windings-typically the primary and secondary-to supply the most isolation; more of these can be placed between secondary windings as needed; it is normal to connect the shielding to the core. Encapsulated- a dry transformer with an enclosed core and coil assemble.

• Exciting Current - The amount of current a transformer draws at nominal voltage input in an unloaded state.

• Faraday Shield - A grounded metallic barrier that can be used for improved isolation between the windings of a transformer. In this application, the shield basically reduces the leakage capacitance between the primary and secondary.

• Ferroresonance - Resonance results from the saturation of a ferrous core of an inductive component, which increases the inductive reactance relative to the capacitance reactance.

• Filter - A complex system within the transformer that consists of capacitors, inductors, and a resistor; it provides a relative small opposition to specific frequencies or direct current, as it blocks or attenuates other frequencies.

• Flexible Connector - A conductor that can handle thermal expansion and contraction as well as reduce noise.

• Flux - The lines of force of a magnetic field.

• Ground Fault - Any undesirable current path from a current carrying conductor to ground.

• Ground Fault Interrupter - A device whose function is to interrupt the electric circuit to the load when a fault current to ground exceeds a predetermined value that is less than that required to operate the over-current protective device of the supply circuit.

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