Abstract:
An insulation material for a DC electrical component is suggested. The insulation material comprises a thermoset or thermoplastic matrix and a functional filler component. The functional filler component has a non-linear DC conductivity depending on an applied electrical field strength. At least in a temperature range of 0℃ to 120℃, the functional filler component has a bandgap in the range of 2 to 5 eV, optionally in the range of 2 to 4 eV. Furthermore, a method for producing an insulation material, a use of an insulation material for a high voltage DC electrical component, a DC electrical component comprising the insulation material and the use of a DC electrical component comprising the insulation material in a high voltage DC gas insulated device are suggested.
Abstract:
Die Erfindung betrifft einen Gleichspannungs-Hochspannungsisolator (100) zur Isolierung eines mit Gleichspannung beaufschlagten Leiters (200), eine Hochspannungsanlage für Gleichstrom mit einem Gleichspannungs-Hochspannungsisolator (100) sowie die Verwendung eines Gleichspannungs-Hochspannungsisolators (100) in einer Hochspannungsanlage für Gleichstrom mit einem mit Gleichspannung beaufschlagten Innenleiter (200). Der Gleichspannungs-Hochspannungsisolator (100) weist einen um eine Isolatorachse (A) verlaufenden Grundkörper (50) aus Isoliermaterial, mindestens eine innerhalb des Grundkörpers (50) verlaufende, vorzugsweise um die Isolatorachse (A) umlaufende äußere Elektrode (10a, 10b), und mindestens eine innerhalb des Grundkörpers verlaufende, vorzugsweise um die Isolatorachse (A) umlaufende innere Elektrode (20) auf, wobei die äußere Elektrode (10a, 10b) im Bereich der äußeren Peripherie des Grundkörpers angeordnet ist, wobei die innere Elektrode (20) im Bereich der inneren Peripherie des Grundkörpers angeordnet ist, wobei im axialen Querschnitt das Verhältnis der durchschnittlichen Gesamtweite (wo) der äußeren Elektrode (10a, 10b) zu der durchschnittlichen Gesamtweite (wi) der inneren Elektrode (20) mindestens 0,6, vorzugsweise mindestens 0,8, besonders vorzugsweise mindestens 1,0 beträgt.
Abstract:
The invention relates to a of photoacoustic gas sensing apparatus (100) for sensing a gas sample in a sample chamber (310). The apparatus (100) comprises: a reference light source (220), configured for emitting a reference light beam (221) when driven by a reference power source (225), wherein the reference light beam (221) is configured for passing a reference chamber (320) filled with a reference gas and for reaching a detector chamber (400) filled with a detector gas; a sample light source (210), configured for emitting a sample light beam (211) when driven by a sample power source (215), wherein the sample light beam (211) is configured for passing the sample chamber (310) filled with the gas sample and for reaching the detector chamber (400); a microphone (500), configured for sensing pressure changes in the detector chamber (400), the pressure changes being a function of the gas sample; and a control unit (600), configured for receiving an electric output (560), caused by the pressure changes, from the microphone (500), and for controlling, depending on the electric output (560), an amplitude of the reference power source (225) and/or of the sample power source (215).
Abstract:
An optical sensing system for sensing hydrogen in a fluid comprising a first optical sensor comprising a first optical fiber, wherein an end portion of the first optical fiber is coated with a first hydrogen-sensitive multilayer on an end surface perpendicular to a longitudinal axis of the first optical fiber, the first multilayer being adapted to change its optical properties dependent on a hydrogen partial pressure in the fluid and dependent on a temperature of the fluid, with a known first characteristic; a second optical sensor comprising a second optical fiber, wherein an end portion of the second optical fiber is coated with a second hydrogen-sensitive multilayer on an end surface perpendicular to the longitudinal axis of the second optical fiber, the second multilayer being adapted to change its optical properties dependent on the hydrogen partial pressure in the fluid and dependent on a temperature of the fluid, with a known second characteristic which is different from the first characteristic; at least one light source adapted for coupling light into the first optical fiber and the second optical fiber, at least one light detector adapted for detecting light reflected by the first and second multilayer, a control unit adapted for calculating the hydrogen partial pressure in the fluid by using the first characteristic and the second characteristic and an output signal of the at least one light detector.
Abstract:
The invention relates to a voltage sensing structure for a three-phase power line system, the voltage sensing structure comprising a first field sensor configured to sense an electric field at a first line of voltage, a second field sensor configured to sense an electric field at a second line of voltage, a third field sensor configured to sense an electric field at a third line of voltage, and at least one ground field sensor being configured to sense an electric field at a respective ground potential electrode, wherein the three-phase voltages are determined based on electric fields sensed by the first field sensor, the second field sensor, the third field sensor, and the at least one ground field sensor, and a plurality of sensitivity coefficients corresponding to electric field effects from each of the first line voltage, the second line voltage, and the third line voltage to each of the first field sensor, the second field sensor, the third field sensor and the at least one ground field sensor.
Abstract:
A hydrogen sensor for detecting hydrogen in a medium to be monitored is provided. The sensor comprises a hybrid photonic-plasmonic waveguide (HPWG), comprising a dielectric waveguide, having a substantially rectangular cross-section; a buffer layer, stacked on top of the dielectric waveguide; a sensing layer stacked on the buffer layer, being metallic or semi-metallic and having a refractive index and/or absorption coefficient which is dependent on a hydrogen partial pressure at the sensing layer; and optionally a catalytic layer stacked on the sensing layer. The hydrogen sensor is configured such that a medium to be monitored is in physical contact to the sensor, and configured such that hydrogen in the medium may permeate into the sensing layer, and wherein at least one mode of a propagating wave in the HPWG is affected by a change in the refractive index and/or absorption coefficient of the sensing layer due to a change in the hydrogen concentration in the medium to be monitored. Further, a detection/sensing system employing such sensors, and respective methods are provided.
Abstract:
An optical gas sensing system (1) for sensing hydrogen in a fluid is provided. The system comprises: an optical sensor (100) comprising a fiber (15), the fiber including at an end portion a sensor element (21) with a sensing layer (22) configured to change its dielectric properties depending on a gas partial pressure at the sensing layer (22); at least one light source (55) for coupling light with a first spectrum into the optical sensor (100); a dichroic element (35) provided in the light path between the light source (55) and the sensor element (21); a light detection unit (58) comprising a light dispersion device (59) and at least two photodetectors (61); wherein the light detection unit is configured for detecting light reflected by the dichroic element (35) and light reflected or transmitted by the sensor element (21), after it has passed the light dispersion device (59), with the at least two photodetectors (61); and a control unit (70) operatively coupled to the light detection unit (58). Further, a respective detection method for a gas in a fluid is provided, and electrical transformers employing the gas sensing system and method.
Abstract:
The invention relates to a DC voltage high-voltage insulator (100) for insulating a conductor (200) applied with DC voltage, a high-voltage system for direct current with a DC voltage high-voltage insulator (100), and the use of a DC voltage high-voltage insulator (100) in a high-voltage system for direct current with an inner conductor (200) applied with DC voltage. The DC voltage high-voltage insulator (100) has a base body (50) made from insulating material and running about an insulator axis (A), at least one outer electrode (10a, 10b) running within the base body (50), preferably surrounding the insulator axis (A), and at least one inner electrode (20) running within the base body, preferably surrounding the insulator axis (A), wherein the outer electrode (10a, 10b) is arranged in the area of the outer periphery of the base body, wherein the inner electrode (20) is arranged in the area of the inner periphery of the base body, wherein in the axial cross section, the ratio of the average total width (wo) of the outer electrode (10a, 10b) to the average total width (wi) of the inner electrode (20) is at least 0.6, preferably at least 0.8, particularly preferably at least 1.0.