A robust interferometric fiber-optic current sensor with inherent temperature compensation of the Faraday effect is presented. Sensor configurations based on Sagnac and polarization-rotated reflection interferometers are considered. The sensing fiber residing thermally annealed in a coiled capillary fused silica. embedded silicone within ring-shaped housing. It theoretically experimentally shown that dependence birefringent phase retarders can be employed to balance (0.7/spl times/10/sup...

A highly accurate fiber-optic current sensor for direct currents up to 500 kA is presented. Applications include the control of electrolysis process production metals such as aluminum, copper, zinc, magnesium, and others. The offers significant advantages with regard performance ease use compared state-of-the-art Hall-effect-based transducers. makes Faraday effect in an optical fiber loop around current-carrying bus bars. novel scheme a polarization-rotated reflection interferometer...

A fiber-optic current sensor for direct currents up to 500 kA is presented. Applications include measurement process control and protection in the electrowinning industry, example at aluminum smelters. The offers significant advantages with regard performance ease of installation compared state-of-the-art Hall-effect-based transducers. exploits Faraday effect an optical fiber measures path integral magnetic field along a closed loop around current-carrying bus bars. differential magnetooptic...

We investigate the effect of polarization cross-coupling at polarization-maintaining (PM) fiber connectors on accuracy an interferometric fiber-optic current sensor. The sensor uses Faraday in a coil operated reflection mode and interrogator based nonreciprocal phase modulation. PM link between sensor's opto-electronic module give rise to signal instability due limited insufficiently stable extinction ratio (typically <;25-30 dB). As result can be well outside allowed tolerances applications...

A fiber-optic current sensor for direct currents up to 500 kA is presented. Applications include the control of electrolysis process production metals such as aluminum, copper, magnesium, etc. The offers significant advantages with regard performance and ease installation compared state-of-the-art Hall effect based transducers. novel scheme a polarization-rotated reflection interferometer fiber gyroscope technology used measure magneto-optic phase shift. new technique has been developed...

Optical current and voltage sensors have become attractive alternatives to conventional instrument transformers in high electric power transmission systems. The optical offer important benefits such as small size weight, enhanced performance, constitute an part of the transition digital substations. must comply with stringent accuracy reliability requirements. Commonly, substation applications demand within ±0.2% over outdoor temperature ranges. Other aspects are insensitivity shock...

A highly accurate reflective interferometric fiber-optic current sensor for alternating and direct currents up to 500 kA is investigated. The magnetic field of the introduces a differential phase shift between right left essentially circularly polarized light waves in fiber coil wound around conductor. Technology adopted from gyroscopes used measure current-induced shift. achieves accuracy within ±0.1% over at least two orders magnitude temperatures -40 80°C with inherent temperature...

We report on an interferometric fiber-optic current sensor and its integration into a high voltage circuit breaker. Results conclusions are presented from laboratory tests extended field trial in substation.

The nonlinearities in the response of an interferometric fiber-optic current sensor associated with deviations light waves from perfect circular polarization are theoretically and experimentally investigated. consequences for inherent temperature compensation Faraday effect by means a non-90°-retarder investigated currents up to several 100 kA temperatures between -40°C 80°C. results particular interest sensors high direct electro-winning industry where measurement accuracy within ±0.1% is...

The previously demonstrated inherent temperature compensation of an interferometric fiber-optic current sensor is extended to the cases large Faraday phase shifts and strong bend-induced birefringence in sensing fiber.

We investigate the effect of polarization cross-coupling at maintaining fiber connectors on accuracy interferometric fiber-optic current sensors and demonstrate an optical circuit that is immune to cross-talk connectors.

A fiber-optic current sensor with flexibly packaged sensing fiber for direct currents up to 500kA is presented. Accuracy and calibration stability are well within 0.1%. Applications in the electro-winning industry such as aluminum smelters.

Summary form only given. Optical fiber current sensors for high-voltage electric power substations have been under investigation in the 1980s and 1990s. So far, however, a number of technical shortcomings such as unacceptable sensitivity to temperature vibration well concerns about their long-term reliability contributed prevent extended commercial use. We report sensor which, we believe, meets all important performance requirements. Two configurations investigated. In Sagnac configuration...

The nonlinearities in the response of an interferometric fiber-optic current sensor associated with inherent temperature compensation Faraday effect are investigated at currents up to several 100 kA and temperatures between -40 80degC.

The influence of non-perfect circularity the left and right circular light waves a reflective interferometric fiber-optic current sensor is theoretically experimentally investigated for currents up to several 100 kA temperatures from -40 80degC. By control crucial parameters appropriate packaging sensing fiber accuracy repeatability within plusmn0.1% achieved. Applications are in high-voltage substations electrolytic production metals such as aluminum.

We investigate the effect of polarization cross-talk in interferometric fiber-optic current sensors particularly at fiber connectors and phase modulator. With a modified optical circuit we suppress related signal instability.

Summary form only given. We report a robust Sagnac interferometer type fiber-optic current sensor for applications in DC and AC high-voltage electric power systems. The is composed of readily available components achieves accuracy within /spl plusmn/0.3% over temperature range operation between -40 +85/spl deg/C both, measurements. A new method to prepare package the thermally annealed fiber investigated.