K1650

Modern power station installations often use Hydrogen gas, with its excellent thermal conductivity properties, as the coolant medium for high capacity turbo generators or alternators; with the efficient performance and safe operation of the plant being critically linked to the gas quality used. During the commissioning and decommissioning of the alternator it is essential that the hydrogen is safely introduced and purged. Therefore, air must first be purged from the system by an inert gas such as carbon dioxide (CO2). The hydrogen coolant is then introduced and replaces the purge gas. To decommission the turbogenerator the purge sequence is reversed. During daily operation, the hydrogen purity must also be monitored to ensure that the H2 has not become contaminated by air leakages. Not only will air ingress produce a potentially explosive atmosphere but it will also affect the viscosity of the H2 coolant gas, increasing drag and hence, windage losses. The Alternator Purge Gas Monitor series measures all stages of the fill-purge cycle as well as measuring hydrogen purity during normal operation.