Abb Research Ltd.

Vetco Gray Controls Limited

Abb Schweiz Ag

Abb Technology Ag

Hubert Brändle

Klaus Bohnert

Karim Haroud

Frank Kassubek

Andreas Frank

Stephan Grob

Thomas Alfred Paul

Axel Kramer

Philippe Gabus

Javier Mantilla

Oliver Cossalter

Deran Maas

Max-Steffen Claessens

Eric Killer

Daniele Angelosante

Stephan Wildermuth

Hannes Merbold

Lars Andersson

Juergen Nehring

An electro-optical high-voltage sensor includes a waveguiding sensing fiber of an electro-optical material. The electrical field of the voltage to be measured is substantially parallel to the longitudinal axis of the sensing fiber. The sensing fiber carries two orthogonally polarized light waves, with the applied field affecting the birefringence between the waves. Using an electro-optical waveguiding fiber in this configuration allows the voltage between two widely spaced points to be accurately measured.

Optical high voltage sensor

A high-voltage component, having a first end and a second end, whereby the first end is on a high-voltage potential with respect to the second end. An insulating part, is arranged between the first end and the second end, and an optical fiber is integrated in the high-voltage component and extends from the first end to the second end. A capillary extends from the first end to the second end and is arranged within the insulating part. The inside diameter of the capillary exceeds the outside diameter of the fiber, and the fiber is arranged within the capillary. The capillary includes a protective medium to achieve a dielectric strength in the capillary, which dielectric strength is suitable for the operating conditions.

High-voltage component with optical fiber and method for producing it

The fiber-optic sensor head () for a current or magnetic field sensor comprises an optical fiber which contains a magnetooptically active sensor fiber () and at least one polarization-maintaining supply fiber (), which are optically connected, with the sensor fiber () having its fiber protective sheath removed. The sensor head () furthermore contains a capillary (), in which at least the sensor fiber () is arranged. Furthermore, the sensor head () can be bent in the area of the sensor fiber (), and a friction reducing means () is provided in the capillary (), in order to reduce the friction between the sensor fiber () and the capillary (). The friction reducing means () is advantageously an oil or a dry lubricating means (). The capillary () is advantageously encased by a capillary casing (). The sensor () allows very largely temperature-dependent measurements, is easy to install and allows measurements on large cross-section conductors.

Temperature-stabilized sensor coil and current sensor

A high-resolution fiber laser sensor for measuring a quantity to be measured M has a pumping light source, a fiber laser and a detection/evaluating unit. The fiber laser has: a birefringent first end reflector, a second end reflector, a laser-amplifying fiber, a sensor fiber and a mode coupling. The laser-amplifying fiber, the sensor fiber and the mode coupling are arranged between the end reflectors. In the fiber laser, light is capable of propagating in two optical states which are orthogonal to one another due to their polarization and/or their transversal space structure. The orthogonal optical states can be coupled to one another by the mode coupling. In the fiber laser, a number of longitudinal modes are capable of oscillating in each of the two optical states. In the sensor fiber a change in the birefringence for the two orthogonal optical states can be achieved by interaction of the quantity to be measured with the sensor fiber.

High-resolution fiber laser sensor

The electra-optical voltage sensor has an electra-optically active medium and a distance medium between two electrodes, between which the voltage V to be measured is present. The media and the thicknesses d, dof the media are chosen in such a way that the measured voltage signal has no temperature dependence. By way of example, the thicknesses d, dare chosen in such a way that the influence of the temperature dependences of critical electra-optical coefficients and dielectric constants of the media on the voltage signal cancel one another out. The two media are advantageously arranged in the form of a rod, comprising an alternating arrangement of cylindrical elements of the two media, between the electrodes. BGO and fused silica may advantageously be used as media. The sensor is preferably cast in silicone. It is possible to realize a mechanically stable, temperature-stabilized voltage sensor with low reflection losses, a large half wave voltage and a small sensitivity toward disturbances of the electric field.

Temperature-compensated electro-optical voltage sensor

The voltage sensor for measurement of a voltage V, which is present between two electrodes () and generates an electric field E, comprises at least two layers () made of electro-optically active material and being arranged along a light path (). Through the layers there passes a light beam, the phase and/or state of polarization of which is influenced on account of the electro-optical effect. The orientation of the electro-optically active layers () relative to the light path and the electric field E is chosen in such a way, that the influencing of the light () in the second layer () counteracts the influencing of the light () in the first layer (). In this way, it is possible to realize a sensor with a high half wave voltage, so that high voltages V can be measured unambiguously. A plurality of first and second electro-optically active layers are advantageously arranged between the electrodes ().

Electro-optical voltage sensor for high voltages

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Oberengstringen, Switzerland

Hubert Brändle