Articles

ISOLATION TRANSFORMER

 

The isolation transformer has a physically separated primary and secondary winding generally with a symmetrical winding of 1:1 ratio. The intention is not to modify the voltage but to guard the equipment from reverberation on the power line. The isolation transformer usually is equipped with grounded shield between the windings which facilitate to decrease the capacitive coupling between the coils to block high-frequency sound.
A general advantage of isolation transformer is that it protects the electronic equipments with high standard of safety for computers, communication equipments, VCRs, TVs, expensive gadgets used in hospital such as CNC machines medical instruments and analytical instruments.
Heavy industrial machineries command higher voltage and large current since they are generally larger and more robust. The isolation transformer blocks the piercing noise emanating from these machineries to considerable level.
The salient features of isolation transformer is that it isolates the equipment from noisy power line, reduces power line clamor, surges, spikes and transients, high insulation resistance, provides the complete electromagnetic and electro static shielding etc.
Isolation transformer helps in radio frequency isolation. It assists the DC power isolation by division of the DC parts from the meter to control all speakers in the row. Isolation transformer is useful as a security measure in electrical testing and servicing. It provides better analogous of critical load to electrical circuits as also reduces the cumulative leakage current to levels below 300 micro amps with Faraday Shields.
There are three phase isolation transformers that have isolated primary and secondary windings to allow the power input to be isolated from the power output. They are extensively used for saw mills, solar grain dryer, refrigeration, ovens, lighting, lasers, battery chargers, conveyer belt systems and air conditioning.