Transformer Haul Terms and Definitions PART II
This is a list of other transformers terms that may be used in the industry or terms you might see in articles about transformers.
Impedance - That the forces that resist the flow of current in AC circuits like resistance or inductive or capacitive reactance
Inductance - The capability of a coil for storing energy and resisting changes in the flow of current; it is a function of the core material, amount of turns of the coil and the cross section.
Inrush Current - This is when the transformer has a short current surge through it, from residual flux, occurring at the moment energy is applied to the transformer.
Inverter - A device used to change DC into AC power.
KVA - Kilovolt Ampere rating that is a measurement of the output of a transformer without exceeding a certain temperature.
Linear Load - A load in which the relationship between current and voltage is directly proportional.
Load - The quantity of electric power supplied or necessitated at any particular spot in the system. Also a requirement of the KVA or VA from the transformer; light bulbs are loads.
Magnetic Shielding - This conductive material attenuates stray magnetic fields by it positioning around a transformer's coils.
NEMA Enclosure - (National Electrical Manufacturers Association) An enclosure conforming to NEMA specifications, usually constructed of metal, that provides some measure of protection against weather and other elements. Different NEMA ratings determine the degree of protection, ranging from "some measure of protection" to "fully weatherproof". Suitable for outdoor use or where indoor location may constitute a shock hazard if connections are left exposed.
Nominal Voltage - The normal or designed voltage level. For three phase wye systems, nominal voltages are 480/277 and 208/120 where the first number expresses phase to phase (or line to line) voltages and the second number is the phase to neutral voltage. The nominal voltage for most single-phase systems is 240/120.
Nonlinear load - A load in which the relationship between current and voltage is not directly proportional.
Ohm's Law - The relationship between voltage (pressure), current (electron flow), and resistance. The current in an electrical circuit is directly proportional to the voltage and inversely proportional to the resistance. E=lR, or l=E/R, or R=E/l. Where E=voltage, l-current, and R=resistance.
Open Frame - A method of transformer construction utilized when the transformer will be combined with other components inside an enclosure.
Oscillation - The variation, usually with time, of the magnitude of quantity with respect to a specified reference when the magnitude is alternately greater and smaller than the reference.
Polarity - The direction of the current between two leads. If the directions are the same then the leads have the same polarity. In electric transformers the polarity is classes as either additive or subtractive.
Power Factor - Watts divided by volt amps, KW divided by KVA. Power factor: leading and lagging of voltage versus current caused by inductive or capacitive loads, and harmonic power factor: from nonlinear current.
Rated Power - The total of the Volts and Amps derived from all the secondary windings.
Impedance - That the forces that resist the flow of current in AC circuits like resistance or inductive or capacitive reactance
Inductance - The capability of a coil for storing energy and resisting changes in the flow of current; it is a function of the core material, amount of turns of the coil and the cross section.
Inrush Current - This is when the transformer has a short current surge through it, from residual flux, occurring at the moment energy is applied to the transformer.
Inverter - A device used to change DC into AC power.
KVA - Kilovolt Ampere rating that is a measurement of the output of a transformer without exceeding a certain temperature.
Linear Load - A load in which the relationship between current and voltage is directly proportional.
Load - The quantity of electric power supplied or necessitated at any particular spot in the system. Also a requirement of the KVA or VA from the transformer; light bulbs are loads.
Magnetic Shielding - This conductive material attenuates stray magnetic fields by it positioning around a transformer's coils.
NEMA Enclosure - (National Electrical Manufacturers Association) An enclosure conforming to NEMA specifications, usually constructed of metal, that provides some measure of protection against weather and other elements. Different NEMA ratings determine the degree of protection, ranging from "some measure of protection" to "fully weatherproof". Suitable for outdoor use or where indoor location may constitute a shock hazard if connections are left exposed.
Nominal Voltage - The normal or designed voltage level. For three phase wye systems, nominal voltages are 480/277 and 208/120 where the first number expresses phase to phase (or line to line) voltages and the second number is the phase to neutral voltage. The nominal voltage for most single-phase systems is 240/120.
Nonlinear load - A load in which the relationship between current and voltage is not directly proportional.
Ohm's Law - The relationship between voltage (pressure), current (electron flow), and resistance. The current in an electrical circuit is directly proportional to the voltage and inversely proportional to the resistance. E=lR, or l=E/R, or R=E/l. Where E=voltage, l-current, and R=resistance.
Open Frame - A method of transformer construction utilized when the transformer will be combined with other components inside an enclosure.
Oscillation - The variation, usually with time, of the magnitude of quantity with respect to a specified reference when the magnitude is alternately greater and smaller than the reference.
Polarity - The direction of the current between two leads. If the directions are the same then the leads have the same polarity. In electric transformers the polarity is classes as either additive or subtractive.
Power Factor - Watts divided by volt amps, KW divided by KVA. Power factor: leading and lagging of voltage versus current caused by inductive or capacitive loads, and harmonic power factor: from nonlinear current.
Rated Power - The total of the Volts and Amps derived from all the secondary windings.
