Abstract:
A method and an apparatus for fault detection in a mixed configuration power transmission line (10) comprising a plurality of sections (11, 12, 13) arranged between one end (S1) of the transmission line (10) and the other end (S2) of the transmission line (10) and comprising at least one overhead line section (11, 13) and at least one cable section (12) are disclosed. Based on a comparison travelling wave voltage or current time derivatives at the one end (S1) and the other end (S2) of the power transmission line (10) with selected threshold values, it is determined if there is a fault occurring in at least one cable section (12) of the power transmission line (10). Embodiments of the present invention utilize amplification of travelling wave voltages and/or currents which may occur at junctions (14, 15) between a cable section (12) and an adjacent overhead line section (11, 13) in determining if the fault occurs in a cable section (12) of the power transmission line (10).
Abstract:
A converter arrangement (60) is disclosed, which is configured to convey power from a first power system (61) to a second power system (62), or vice versa, wherein the second power system (62) has a nominal operating voltage frequency range and a nominal operating voltage amplitude range. The converter arrangement (60) comprises at least one converter module (63, 64, 65), which comprises at least one first converter unit (66, 73, 81) configured to, on basis of power conveyed from the first power system (61) and the nominal operating voltage frequency range, generate an amplitude-modulated voltage waveform having a selected frequency within the nominal operating voltage frequency range. The at least one converter module (63, 64, 65) comprises at least one transformer (67, 74, 82) configured to receive the amplitude-modulated voltage waveform and convert amplitude thereof on basis the nominal operating voltage amplitude range so as to generate an amplitude-modulated voltage waveform having the selected frequency within the nominal operating voltage frequency range and a selected amplitude within the nominal operating voltage amplitude range. The at least one converter module (63, 64, 65) comprises at least one second converter unit (68, 75, 83) configured to receive the amplitude-modulated voltage waveform generated by the at least one transformer (67, 74, 82) and on basis thereof generate a demodulated voltage waveform having a frequency within the nominal operating voltage frequency range and an amplitude within the nominal operating voltage amplitude range, wherein the at least one second converter unit (68, 75, 83) is electrically connected to the second power system (62).
Abstract:
Unique systems, methods, techniques and apparatuses of a robotic control system are disclosed. One exemplary embodiment is a robotic control system comprising a robot including a memory device, a sensor, a processing device, and a communication device. The processing device is structured to receive data from the sensor, compare the data from the sensor to the first 3D model, and identify differences between the data from the sensor and the first 3D model. The robotic control system also comprises a remote computing device located in a second workspace including a communication device, a memory device, a processing device structured to update the second 3D model of the workspace using the identified differences, and a user interface structured to receive user input and display the updated 3D model. The robot is structured to move in response to receiving the user input by way of the remote computing device.
Abstract:
It is presented a bypass switch for providing a bypass path between a first terminal and a second terminal. The bypass switch comprises: a first set of electrical contacts respectively connected to the first terminal and the second terminal; a second set of electrical contacts respectively connected to the first terminal and the second terminal; and a movable member. The movable member comprises a first conductive section, a second conductive section and an insulator between the first conductive section and the second conductive section, wherein the movable member is movable from an initial state, via a first state, to a second state, wherein in the initial state the first set of electrical contacts are conductively separated and the second set of electrical contacts are conductively separated, in the first state the first set of electrical contacts are conductively connected via the first conductive section and the second set of electrical contacts are conductively separated, and in the second state the second set of electrical contacts are conductively connected via the second conductive section.
Abstract:
It is presented a bypass switch for providing a bypass path between a first terminal and a second terminal. The bypass switch comprises: a first contact device; a second contact device; and a plunger being moveable from an initial state, via a first state, to a second state, wherein in the initial state the first terminal and second terminal are conductively separated; in the first state a movement of the plunger causes the first contact device to close a first conductive connection between the first terminal and the second terminal; and in the second state the plunger mechanically forces the second contact device to close a second conductive connection between the first terminal and the second terminal.
Abstract:
There is provided mechanisms for travelling wave protection of a transmission line. A method comprises acquiring information of both voltage and current polarities from two ends of a transmission line. The method comprises comparing the voltage and current polarities of both ends of the transmission line to each other. The method comprises making a trip decision based on the comparison.
Abstract:
The present disclosure relates to an electrically insulating inorganic sheet (1) comprising at least 90% by weight inorganic particles (2), and a binder (3) which binds the particles together to form the sheet, for use as solid insulation in an electrical device, e.g. a power transformer.
Abstract:
A photometer is provided for measuring the concentration of a chromophore in a fluid. The photometer includes a light source, a sample cell and a detector. The light source includes first, second, third and fourth light emitting diodes (LEDs). Each of the first and second LEDs emit light at a measurement wavelength and each of the third and fourth LEDs emit light at a reference wavelength. The first and second LEDs are arranged diagonal to each other and the third and fourth LEDs are arranged diagonal to each other. The photometer performs a routine for correcting concentration measurement for LED drift.
Abstract:
A method of characterizing a wet paint layer stack of a painted body is provided, which comprises at least two wet paint layers, by individual parameters of the wet paint layers, based on fitting to a physical model, the method being carried out by a sensor system in a non-contact manner The sensor system comprises an emitter system for emitting THz radiation, a detector system for detecting THz radiation, and a processing unit operationally coupled to the emitter system and the detector system. The method comprises: Emitting, by the emitter system, a THz radiation signal towards the painted body such that the THz radiation interacts with the wet paint layer stack,detecting, by the detector system, a response signal being the detected THz radiation signal having interacted with the wet paint layer stack;Determining model parameters of the physical model by optimizing the model parameters such that a predicted response signal of the physical model, which approximates the interaction of the THz radiation signal with the wet paint layer stack, is fitted to the detected response signal, wherein at least some of the model parameters are indicative of individual optical properties of the wet paint layers and of a wet paint layer thickness; and Determining, from the determined model parameters, the individual paint layer parameters of at least one of the wet paint layers.
Abstract:
The present disclosure relates to a welding sleeve (7) for armoured cables. The welding sleeve (7) comprises a first sleeve part (9) arranged to receive an armoured cable, wherein the first sleeve part (9) has a perimeter surface (9a) for welding armouring wires of an armoured cable thereto, a second sleeve part (11) arranged to receive an armoured cable, wherein the second sleeve part (11) has a perimeter surface (11a) for welding armouring wires of an armoured cable thereto, wherein the first sleeve part (9) is arranged to receive the second sleeve part (11), the second sleeve part (11) being axially displaceable relative to the first sleeve part (9), along a common central axis (C), between an extended position and a retracted position, in which retracted position the first sleeve part (9) receives a greater portion of the second sleeve part (11) than in the extended position, and a rotation preventing arrangement (13) arranged to prevent rotational motion of the first sleeve part (9) relative to the second sleeve part (11).