3Rd Year Jatc Transformers

Front 1

Harmonic

Back 1

Voltage or current at a frequency that is a whole number (integer) of the fundamental frequency

Front 2

Notch

Back 2

Distortion in voltage waveform where voltage quickly drops toward zero,then returns to correct value

Front 3

Common mode noise

Back 3

Electromagnetic interference induced on power or communication lines

Front 4

Choke

Back 4

Reactor used to restrict the current to ac or DC drives in the case of short circuits in the drive itself

Front 5

Total demand distortion

Back 5

Ratio of current harmonics to the max load current

Front 6

Harmonic mitigating transformer

Back 6

Transformer designed to reduce harmonics but not remove in a power distribution system

Front 7

Harmonic filter

Back 7

Device used to reduce harmonic frequencies and thd

Front 8

The most effecient way to send electric power over transmission lines

Back 8

The lowest current possible

Front 9

Reactance

Back 9

The opposition to current flow in an ac circuit

Front 10

Electrostatic shields

Back 10

Can prevent common mode noise only if secondary is ungrounded

Front 11

Output reactors

Back 11

Help eliminate voltage spikes by slowing down the rate of change in a drive output voltage

Front 12

3 benefits with grounding the secondary of a drive isolated transformer

Back 12

Impulse immunity to load side,reduce common mode noise,prevents induced ground current upstream

Front 13

Drive isolation transformer

Back 13

Designed with additional reactance for non linear loads

Front 14

Auto transformer reduce voltage motor starting by

Back 14

50,65,80 percent to the line voltage

Front 15

Harmonic sequence

Back 15

Is the phasor rotation with respect to the fundamental (60)hertz frequency

Front 16

Phasor rotation

Back 16

Is the order in which waveforms from each phase cross zero

Front 17

Total harmonic distortion

Back 17

Amount of harmonics on a line compared to the fundamental frequency (60)hertz

Front 18

Power factor

Back 18

Ratio of true power to apparent power ptrue/papparent

Front 19

True power

Back 19

Is the power in watt or k watts used in motors or lights

Front 20

Reactive power

Back 20

Is the power in var or kvar ..stored and released by capacitors and inductors

Front 21

Harmonic power

Back 21

Is the power in VA or kvar lost to distortion

Front 22

Apparent power

Back 22

Is the power in VA or kva..sum of true,reactive and harmonic power

Front 23

Displacement power factor

Back 23

Ratio of true power to apparent power due to phase displacement

Front 24

Distortion power factor

Back 24

Ratio of true power to apparent power due to( thd) total harmonic distortion

Front 25

Current crest factor

Back 25

Is the peak value of a wave for divided by the rms value of a waveform

Front 26

Ballast

Back 26

Controller for providing initial start up voltage and keep a constant current thru the lamp

Front 27

Fourier transformer

Back 27

Mathematical method of converting a time based waveform into frequency based information

Front 28

Reactor,line reactor

Back 28

Coil added in series with a load to reduce inrush current

Front 29

Saturable core reactor

Back 29

Inductor who's inductance is controlled thru the use of magnetic field created by a second winding wound around the same iron core as the primary winding

Front 30

Auto transformer

Back 30

Is any transformer In which the primary and secondary circuits have a portion of their two windings in common