In　order　to　research　the　influence　of　leakage　flux　in　high　hydrostatic　pressure　vessel,we　have　measured　the　magnetization　curve　under　five　different　ambient　conditions,then　compared　the　BH　curve　measured　on　table　far　from　iron　with　BH　curve　measured　in　situ　in　pressure　vessel.

In this paper the on-line analysis of leakage flux will be presented as an alternative and efficient procedure fo.

By high capacity high-speed switch,the series reactor is shorted during normal operation,eliminating the reactor leakage magnetic flux to eddy hot produced metal member around it.