The content of carbon dioxide remained in hydrogen during the hydrogen displacement in a hydrogen-cooled generator system was calculated roughly.Moreover

the effect of carbon dioxide escaped from hydrogen into the inner water cooling system on pH value of the inner cooling water was evaluated.On the basis of on-site sampling and detection

and combining with case study on hydrogen leaking into the inner water cooling system

the presence of carbon dioxide and its effect on the inner cooling water quality was demonstrated.Results showed that

when defects existed in the generator

the carbon dioxide in hydrogen would result in low pH value and high electrical conductivity of the inner cooling water

causing corrosion of the copper wire

which should be paid much attention.