We have developed a fiber-optic gas pressure monitoring system with new gas density sensors for detecting the leakage of insulation gas of the Gas Insulated Transmission Line (GIL). In this system gas pressure of over one hundred gas compartments can be monitored with several optical fibers and without electric power supply to the sensors. This simple and highly reliable system enables speedy gas leakage detection, allowing us to take appropriate measures before reaching its critical pressure. Developed sensor makes mechanical bend of an optical fiber when the gas leakage, and causes an optical transmission loss as the detected signal. Using a conventional optical time domain reflectmeter with these sensors, a multi point sensing system can be constructed. In this paper we report the principle of this sensor and the design of the monitoring system for the Shinmeika-Tokai GIL.
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