Isolation / Distribution Transformers have primary and secondary windings are physically separated from each other. The windings of isolation transformer are insulated from each other and are referred to as "insulated". In an isolation transformer the output winding will be isolated. Secondary neutral to ground bonding eliminates common mode noise, providing an isolated neutral-ground reference for sensitive equipment. An isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. They also block interference caused by ground loops. Isolation transformers are different from auto transformers in which the primary and secondary share a common winding. Isolation transformers are often used to protect high gain circuits, or prevent noisy ground paths in instrumentation.
Line Reactor introduces a specific amount of inductive reactance into a circuit. When a line reactor introduces inductive reactance into a circuit, in affect it is limiting the current in the line which in turn filter the waveform and attenuates electrical noise and harmonics associated with an inverter/drive output. A three phase line reactor is a set of three coils (also known as windings, chokes or inductors) in one assembly. It is a series device, which means it is connected in the supply line such that all line current flows through the reactor. Line reactors are current-limiting devices and oppose rapid changes in current because of their impedance. They hold down any spikes of current and limit any peak currents. Inductors placed at the input and output of electrical equipment, can provide protection and improve performance. Line Reactors absorb many power line disturbances which could damage or shut down your inverters, variable speed controllers or other voltage sensitive equipment. Line Reactors are today's Solution to SCR Drive - Inverter Application Problems three phase AC line reactors when used as input or output filters on inverter electronic speed drive applications provide several significant benefits. Motor Guarding Transient Filters incorporate reactors, resistors, and capacitors. When these devices are placed on the output of adjustable frequency drives they protect the motor windings from the damaging voltage spikes associated with the fast switching effects of IGBT's and long lines and cables.