During the time of commision debugging for the complete turbo-generator set no.1 in Anqing Power Plant

severe hydrogen leakage had appeared

threatening safe production in the power plant.It has been discovered from inspection after shutdown that the causes resulted in large quantity hydrogen leakage are as follows:the plugs in seal grooves on large end covers at two sides of the generater have loosened

and the sealant being blown down by the hydrogen

in addition

abnormal operation of the differential pressure valve and the balanced valve for sealing oil having intensified the hydrogen leakage.After re-installing plugs into the seal grooves

and replacing spacers on end covers of the generator

the corrogated pipe of differential pressure valve being renewed

the balanced valve being cleaned after disassembling

the inlet and outlet pipes of hydrogen dryer being reconnected

making the quantity of hydrogen leakage to be decreased by a big margin

satisfying the reqirements of power industry.