| 摘要 |
PCT No. PCT/JP86/00402 Sec. 371 Date May 26, 1987 Sec. 102(e) Date May 26, 1987 PCT Filed Aug. 6, 1986.The disclosed porcelain insulator has built-in optical transmission media extending therethrough from a base metal secured at one end thereof to a conductor-holding fixture at the opposite end thereof. The conductor-holding fixture may carry one or both of two type sensing units: namely, a sensing unit having a current transformer (CT) coupled to the phase conductor, a load resistor connected to the CT, and an electro-optic element coupled to both said load resistor and said optical transmission medium; and another sensing unit having a capacitive potential transformer (PT) coupled to said conductor and an electro-optic element coupled to both said PT and said optical transmission medium. An electric measuring device is formed by applying light to the electro-optic element through the optical transmission medium of the insulator, modulating the incident light by the electro-optic element depending on the line current or voltage, receiving the modulated light through the optical transmission medium of the insulator, converting the modulation of the received light into an electric signal. Due to information detection right by the line conductor and optical transmission of the information, ill effects such as electromagnetic interference and insulation deterioration at the spot of detection and along the information transmission path are eliminated. Thus, when used in transmission and distribution lines the device improves the safety and accuracy and maintains the improved level of safety and accuracy.
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