this
inductor whose inductance is controlled by magnetic flux of a second winding wound around the same iron core as the primary
SATURABLE CORE REACTOR
What reduces notch depth by 50%
3% impedance
Low impedance means that _____ is very high.
flow of current
ALL two winding transformers are ______
isolation transformers.
3 basic functions of isolation transformers
1. voltage change
2. reduction/ dissipation of drive induced ground currents
3.reduce common mode noise
reduces current generated by the rapid switching of a motor drive or signaling device.
common mode choke
electrostatic shields can prevent common mode noise from transferring to the primary if the secondary is ________.
ungrounded
_______are used in the start circuit of large synchronous motors to provide a voltage to the AC coil of PFR(polarized frequency relay)
Reactors
if the secondary of drive isolation transformer is wye connected it can be _____
grounded
many load inputs are designed with either _____ or _______
3 phase static diodes or 3 phase six pulse SCR bridge rectifiers pg 149
a distortion in a voltage waveform where voltage quickly drops toward zero and then returns to correct the value
NOTCH
______ protects a circuit from short circuits or from common mode noise
CHOKE
______ acts as a buffer between a non-linear power supply, the load and the power source
Isolation Transformer
A type of electromagnetic interference induced on power and communication lines
Common-Mode Noise
______ represents a separately derived system unlike line-reactors
the secondary of a drive isolation transformer
a reactor used to restrict current to AC or DC drives in case of short circuits in the drive itself
LINE CHOKE OR CHOKE
_____ uses a small direct current to control larger AC
SATURABLE CORE REACTOR
__________ are often used to correct low-power-factor situations which also cause resonance through high voltage distortion.
CAPACITOR BANKS
used for timing signals and to activate equipment without high inrush current
Zero Crossover pg 140
Any transformer in which the the primary and secondary circuits have a portion of their windings connected.
Autotransformer
used to eliminate voltage spikes by slowing down the rate of change of drive
Output Reactor for output voltage
Input Reactor for input voltage
When impedance is in the form of a reactor, the impedance ______ and ______
decreases notch depth and widens the notch width.
(reduces the impact and lengthens the of notch)
_______ reduces common mode noise coupling form primary to secondary
GROUNDING
two common types of reactors are
dry type and oil immersed
_____ is usually constructed from a single winding with multiple taps
Autotransformer