Apparatus for monitoring hydrogen gas leakage into the stator coil water cooling system of a hydrogen cooled electric generator

Apparatus for monitoring cooling gas leakage into a closed circuit liquid cooling system of an electric generator, the interior of which is cooled by said cooling gas and the stator coils of which are internally cooled by said closed circuit liquid cooling system, said closed circuit liquid cooling system including a liquid tank pressurized by a source of gas of the same type of said cooling gas, said cooling gas leakage being indicative of a breach in said closed circuit liquid cooling system, and causing a net increase of the amount of gas in said liquid tank, comprising:

• (A) sensor means operable to sense predetermined parameters relative to said liquid tank and provide corresponding output signals indicative thereof;
• (B) computer means responsive to said output signals and operable in repetitive time increments to calculate, for each said time increment, the number of moles of gas within said liquid tank;
• (C) means for determining a relatively rapid change in the number of said moles due to an addition to, or venting of gas from, said liquid tank;
• (D) said computer means being operable to estimate a projected value for the number of moles of said gas within said liquid tank after said change, had said change not occurred;
• (E) said computer means being further operable to obtain the difference between said projected value and the actual calculated number of moles and to add said difference to the actual calculated number of moles for that time increment and to subsequent calculated number of moles for subsequent time increments.