Hitachi, Ltd.

Teyon Shin

Masahiko Fujita

Hayato Hatanaka

Sealed chamber for monitoring pressureis provided on sealed tank. Sealed tankis filled with insulating gas. And, a connection using insulated pipeis provided between medium-pressure spacethat makes a medium pressure and sealed chamber for monitoring pressure. In sealed chamber for monitoring pressure, a pressure monitoring and controlling means is provided for monitoring the internal pressure thereof to activate the pressure-release control in response to the situation where the monitored internal pressure has reached the predetermined setting value. The pressure monitoring and controlling means includes solenoid valvethat is capable of opening sealed chamber for monitoring pressureto the atmosphere, pressure detectorthat detects the internal pressure, and pressure monitor, which activates solenoid valvefor pressure-release when pressure detectordetects that the internal pressure has reached the predetermined abnormal pressure value.

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Hitachi, Japan

Teyon Shin