Abstract
Hydrogen is a colorless, odorless, tasteless, highly flammable, explosion-prone nontoxic gas. It is superior to air in many respects. The explosive limits of hydrogen in air are about 18–60%. During filling of hydrogen, air is first replaced with CO2, and then CO2 is replaced with H2. While evacuating hydrogen, H2 is first scavenged with CO2 and then CO2 is replaced with air. Carbon dioxide is heavier than air; if inhaled, even 15% concentration of CO2 gas can cause unconsciousness in less than 15min. To ensure reliable, uninterrupted power generation, it is important that the generator is protected in all respects. Safety of the generator is guaranteed by providing fault prevention relays. Actuation of any of these protective relays automatically disconnects the generator from the grid. These protective relays must be highly dependable, which is secured by dynamic testing of these relays.
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