Maschinenfabrik Reinhausen Gmbh

Messko Albert Hauser Gmbh & Co. Kg

Karsten Viereck

Dieter Dohnal

Reiner Brill

Junliang Wu

Volker Karrer

Kurt Kugler

Rainer Brill

Ansgar Hinz

Manfred Stadelmayer

Ulrich Sundermann

Audrius Ilgevicius

Anatoli Saveliev

Alexander Reich

Andreas Dreger

Kai Haemel

Werner Kr&uuml;ger

Jochen Von Bloh

Mario Schmeckebier

Alexei Babizki

Udo Hertel

Michael Heger

Tobias Gruber

Helmut Proelss

Christian Heudecker

Stefan Abelen

Daniel Preissler

Kai Hämel

Tobias Wagner

Manfred Eichert

Alexander Lodig

Ulrich Rehnelt

Sebastian Hollunder

Martin Kubiczek

Juergen Schuebel

Klaus Krueger

Sebastian Daiser

Jurgen Schubel

Jürgen SCHÜBEL

Klaus KRÜGER

Ullrich Rehnelt

A method monitors at least one item of inductive equipment. The method includes: performing an operation of recording real-time data relating to a current condition of the at least one item of inductive equipment; performing an operation of transferring the recorded real-time data to a monitoring unit assigned to the at least one item of equipment; performing an operation of ascertaining a condition factor of the at least one item of inductive equipment based on the real-time data; performing an operation of ascertaining a failure rate for the at least one item of inductive equipment on the basis of the condition factor; and performing an operation of determining a maximum permitted hotspot temperature on the basis of the failure rate.

Method and system for monitoring at least one inductive operating means

A system analyzes a state of an inductive operator. The system includes a measuring device that is configured to: detect an acoustic reference signal and a plurality of operating variables, which can change over time, of the inductive operator or a reference inductive operator during a reference time period; and detect an acoustic signal and the operating variables during a productive time period. The system also includes an evaluating device that is configured to: generate a reference data set from the reference signal and a productive data set from the acoustic signal; perform a regression analysis of the reference data set and thereby create a model for description of the acoustic reference signal by the operating variables; and generate a state evaluation of the inductive operator from a difference between the productive data set and values modelled in accordance with the model.

State analysis of an inductive operating resource

A method monitors capacitor bushings for an AC mains. The mains has first-third phases, associated with first-third mains lines, capacitor bushings, and mains voltages. Each capacitor bushing has a conductor, surrounded by foil, connecting its mains line. The method includes: at a first instant, for each phase: a first reference voltage phasor is determined; and a foil voltage present between the respective foil and ground potential is detected and a corresponding first foil voltage phasor is determined; at a second instant, for each of the phases: a second reference voltage phasor is determined; the foil voltage is detected and a second foil voltage phasor is determined; for each capacitor bushing: a loss factor change is calculated based on the respective reference voltages and foil phasors and those of the adjacent capacitive bushing; and a monitoring signal is generated based on a comparison of the loss factor and a tolerance value.

Method and apparatus for monitoring the loss factor of capacitor bushings

A method monitors capacitor bushings of a three-phase AC mains, which has first, second, and third mains lines respectively associated with first, second, and third: phases, capacitor bushings, and mains voltages. Each of the capacitor bushings has: a conductor connected with the associated mains line, and an electrically conductive foil enclosing the conductor. The method includes, for each of the phases: determining, at a predetermined initial instant for a characteristic variable, which is characteristic for the respective capacitor bushing, a corresponding characteristic value; determining, at a predetermined later instant after the initial instant for the characteristic variable, a corresponding normalised characteristic value in dependence on the respective characteristic value and/or on at least one of remaining characteristic values; and checking whether the normalised characteristic value has impermissibly changed.

Method and device for monitoring capacitor bushings for an alternating-current grid

Transformers are in a parallel circuit in which a tap changer with a control sensor is associated with each of the transformers and all control sensors are connected together by a communications connection. Each control sensor generates a measurement that is transferred by the communications connection. A measurement is generated with each of the control sensors, and at least one of the measurements of the control sensors of the transformers by the communications connection is transferred to N&#x2212;1 control sensors. Then a controlling deviation caused by a circuit reactive current is calculated for each control sensor on the basis of the measurements of the control sensors. Finally the tap changer associated with each transformer is actuated by the respective control sensor as a function of the calculated controlling deviation such that minimization of the circuit reactive current is carried out for the respective transformer.

Method of operating parallel transformers

An apparatus () for detecting gas () in a high-voltage device () filled with an insulating medium () comprises an inlet () for introducing a carrier gas () and an outlet () for discharging a carrier gas (); at least one gas sensor () for detecting a gas (); a first pump () for conveying the carrier gas () in the apparatus (); a membrane () which at least consists of at least one semipermeable material, is at least partially surrounded by the insulating medium () and is at least partially subjected to a flow of the carrier gas (); a second pump () for conveying the carrier gas () into the apparatus () and for conveying the carrier gas () out of the apparatus (); wherein there is no valve which can be used to convey the carrier gas () into the apparatus () or out of the apparatus ().

Apparatus and method for detecting gas

Disclosed is a device and method for reducing network feedback during operation of an electric-arc furnace (). The electric-arc furnace () has three lines () with one electrode () each. A sensor () for measuring the currently flowing current and a sensor () for measuring the currently applied voltage are provided in each line. A control and regulating unit () calculates an electrical actual value (E, E, E). A semiconductor tap changer () is assigned to the furnace transformer () such that, by suitably selecting three target winding taps (T, T, T) of a primary side (P) of the furnace transformer (), a target current (I, I, I) is adjustable in each line ().

Device and method for reducing network reactions when an electric arc furnace is in operation

A three-phase alternating current mains has capacitor bushings that each have a conductor connected with one of the mains lines of the alternating current mains and an electrically conductive lining surrounding the conductor. These bushings are monitored by first determining an upper capacitance and a lower capacitance for each bushing and then detecting a measured voltage between the respective lining and a ground potential at each capacitor bushing. An actual capacitance for each capacitor bushing is calculated that depends on the respective measured voltage and the respective lower capacitance as well as on the measured voltage, the lower capacitance, and the upper capacitance of one of the other capacitor bushings. For each capacitor bushing the respective upper capacitance is compared with the respective actual capacitance and a monitoring signal is generated that is dependent on the results of the capacitance comparison.

Method and apparatus for monitoring capacitor bushings for a three-phase AC system

The invention relates to a method for regulating the voltage of a transformer () having different winding taps (). The problem addressed by the invention is that of providing a method with which different load flow directions can be regulated with conventional transformers () and voltage regulators () in order to ensure a safe and reliable supply of voltage. The general inventive concept consists in determining, using a method in which a quadrant system () is used, the phase angle of the conduction current (I) and thus the load flow direction, thereby preventing deviation from the voltage range as a result of power input that is too high, by controlling the load tap changer ().

Method for regulating the voltage of a transformer

The invention relates to a control transformer that is designed as a phase-shifting transformer, wherein semiconductor switching components are provided for each phase at a regulating winding with several partial windings. According to the invention, an additional connecting line with an additional electronic switching component is provided in each phase wherein each of these connecting lines connects a module of the respective phase with the end of the main winding of the adjacent phase.

Control transformer

The invention relates to a power transformer with electronic components. The aim of the invention is to arrange the energy supply of the electronic components of a power transformer closer to the components and thus eliminate the disadvantages of the prior art. According to the invention, a stray field collector is brought into a stray field of the power transformer, whereby a voltage is generated.

Power transformer with electronic components

The invention relates to a transformer with a tap changer, wherein optionally the primary or secondary side can be regulated by the tap changer, and wherein, on the side of the transformer to be regulated, a main winding and at least one regulating winding, which is connectable by the tap changer, are provided. According to the invention, the main winding is divided into two main winding parts, and the at least one regulating winding and the tap changer () connecting the regulating winding are arranged electrically between the two main winding parts ().

Transformer with on-load tap changer

The invention relates to a flow monitor for monitoring the flow of flowing media, wherein a paddle projecting into the flow transfers the rotating movement of the paddle onto a display device by means of a magnetic gear comprising a plurality of individual magnets corresponding with each other.

Paddle-type flowmeter with magnetic coupling

The invention relates to a method for controlling a heatable dehumidifier. The heating of the dehumidifier is to be actuated only when several congruent time windows within which a temperature gradient is greater than or equal to 0 could be determined during a certain period of time, i.e. the heating is to be actuated only when no air flows into the interior of the expansion vessel of the transformer.

Method of drying an air dehumidifier

A dehumidifier for an electrical-equipment air intake has an outer housing wall and a floor of a material with a high specific thermal conductivity downwardly closing the outer housing wall, having a downwardly tapering funnel-shaped inner surface formed with a central downwardly open port, and having a rounded edge where the surface meets the port. An inner air-permeable housing inside the outer housing wall holds a moisture-absorbing mass so that air drawn in through the port can pass through the mass and then into a space between the inner and outer housings. A moisture sensor is provided between the housings and a heater in the mass. A controller connected between the heater and the sensor energizes the heater and cooks moisture out of the mass such that the moisture condenses on the floor and runs over the edge out through the port.

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Wuppertal, Germany

Karsten Viereck