Special Features of Isolation Transformer: i) Number of primary turns are equal to number of secondary turns. ii) Disconnect the load equipment from supply: Sometimes it is essential to disconnect the load equipment such as the cathode ray oscilloscope (CRO) from the supply ground. iii) Sensitive and costly equipment need to be disconnected from supply to protect from noisy ground connection. iv) Reduction of voltage spikes: Voltage spikes are short duration high amplitudes pulses which get superimposed on the ac supply. These are dangerous to delicate equipment. Isolation transformer reduces the amplitude of spike .
Applications of isolation transformer: i) Disconnect the load equipment from supply ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device. iv) Protects loads from harmonic distortion.