Hitachi Hi-Rel Power Electronics Assistant Sales Manager Interview Questions and Answers

UPS stands for Uninterruptible Power Supply. It is an electrical device that provides emergency power to a load when the input power source fails.

• UPS is used to protect critical equipment from power outages, voltage fluctuations, and other power-related issues.

• It consists of three main components: a battery, an inverter, and a charger.

• The battery stores energy and provides power to the load when the input power source ...read more

THD stands for Total Harmonic Distortion in UPS.

• THD is a measure of the distortion of the electrical signal in a UPS.

• It is expressed as a percentage of the fundamental frequency.

• Lower THD values indicate a cleaner and more stable power output.

• THD can affect the performance and lifespan of connected equipment.

• For example, a UPS with a THD of less than 5% is considered good.

Isolation transformer in UPS provides electrical isolation between the input and output, protecting equipment from electrical noise and surges.

• Isolation transformer separates the input and output circuits of the UPS.

• It protects equipment from electrical noise and surges.

• It also provides a safety barrier between the utility power and the equipment.

• Isolation transformer can improve the quality of power by reducing harmon...read more