3m Innovative Properties Company

Michael H Stalder

Jens Weichold

Mark Gravermann

Bernd Schubert

Christian Weinmann

Gerhard Lohmeier

Friedrich A Busemann

Sebastian Eggert

Pasquale J Zanoli

Hermanus Franciscus Maria Van Meijl

Gunther A J Stollwerck

Holger J Kurzhals

Rainer Reeken

Sebastian Eggert-Richter

Dipankar Ghosh

Myungchan Kang

Gunther Stollwerck

Giuliano Bolcato

Christopher D Sebesta

Andreea Sabo

Christine B Bund

Johannes Fink

Guenter M Zilligen

Lars Schrix

Michael Petry

Harald Westkamp

Werner Roehling

Tsunehisa Nakamura

Benjamin Muenstermann

Joerg Hahn

Mirco Gunjaca

Guenther A J Stollwerck

Paul H R Jolly

Willy A Ahlmann

Benhard C Schneider

Frank Van Meijl

Gunther Aj Stollwerck

Gunther AJ Stollwerck

Holger Kurzhals

Gunther Dr Stollwerck

Voltage sensor () comprising a voltage divider () for sensing an AC voltage of a HV/MV power conductor (). For adjusting the common overall impedance of the low-voltage portion of the voltage divider towards a desired impedance, the low-voltage portion () comprises one or more low-voltage impedance elements (), a plurality of adjustment impedance elements () and a plurality of switches. In its connect state, each switch electrically connects an adjustment impedance element in parallel to at least one of the one or more low-voltage impedance elements (). The overall impedance of the high-voltage portion () and the overall impedance of the low-voltage portion () of the voltage divider () are adapted such that, by bringing one or more of the switches () into their connect state, the voltage divider () has, for an AC voltage of between 5 and 25 kV phase-to-ground and a frequency of between 40 and 70 Hertz, a dividing ratio of 3077, of 6154, of 6769 or of 10 000.

Adjustable voltage sensor

A hearing protection device is provided. The hearing protection device includes a first earmuff connected to a second earmuff by a headband. Each of the first and second earmuffs are configured to dampen ambient sound. The hearing protection device also includes an antenna, located within a housing of the first earmuff. The antenna comprises a rigid portion coupled to a flexible portion. Both the rigid portion and the flexible portion are fixed within the housing. The flexible portion is configured to remain substantially in line with a ground plane with respect to the rigid portion.

Antenna for protective personal equipment

Encapsulated PCB assembly () for electrical connection to a high- or medium-voltage power conductor in a power distribution network of a national grid, comprising a) a PCB (), delimited by a peripheral edge () and comprising a high-tension pad () on a voltage of at least one kilovolt, b) an electrically insulating encapsulation body () in surface contact with, and enveloping, the high-tension pad and at least a portion of the PCB edge adjacent to the high-tension pad, c) a shielding layer () on an external surface () of the encapsulation body and for being held on electrical ground or on a low voltage to shield at least a low-voltage portion of the PCB. The high-tension pad extends to the peripheral edge of the PCB.

Encapsulated printed circuit board assembly

Impedance assembly () for use in a voltage divider for sensing an AC elevated voltage of at least 1 kV of a power-carrying conductor () distributing electrical energy in a national grid. The impedance assembly comprises a) a PCB (); b) a high-voltage contact () for connection to the power-carrying conductor; c) a first plurality of impedance elements () on the PCB, connected to the high-voltage contact and in series with each other such as to be operable in a first voltage divider () for sensing the voltage of the power-carrying conductor; and d) a second plurality of impedance elements () on the PCB, connected to the high-voltage contact and in series with each other such as to be operable in a second voltage divider () for harvesting electrical energy from the power-carrying conductor.

Impedance assembly

A voltage divider assembly for a voltage-dividing sensor for sensing a voltage of a MV/HV power conductor in a power network includes a plurality of discrete impedance elements electrically connected in series with each other such as to be operable as a high-voltage cable side of the voltage-dividing sensor and a cable connector for mechanical engagement with a cable plug at an end of a tap cable conducting the voltage of the power conductor to the voltage divider assembly. The cable connector is electrically connected with one discrete impedance element of the plurality of discrete impedance elements.

Voltage divider assembly

Elastic sleeve () for electrically insulating a HV/MV power conductor in a power network, comprising a) a shrinkable or expandable elastic sleeve body (); b) a receiving space () in the sleeve body, for receiving the power conductor; c) a cavity () formed in the sleeve body; and d) a divider assembly (), arranged, at least partially, in the cavity and comprising a plurality of discrete impedance elements, operable as a voltage divider for sensing a voltage of an inner conductor of the power conductor.

Elastic sleeve for a power conductor

The invention relates to a voltage sensing device for a high and/or medium-voltage power-carrying conductor, the voltages sensing device comprising: &#x2022; a carrier element () with a passageway for receiving the power-carrying conductor, &#x2022; wherein the carrier element comprises an electrode () extending in an axial direction of the passageway of the carrier element and operable as a first electrode of the voltage sensing device, wherein &#x2022; a conductor () of the power cable is operable as the second electrode of the voltage sensing device and wherein &#x2022; the carrier element has a coefficient of thermal expansion that is less than 5&#xd7;10^&#x2212;6 1/K at 20 C.

Voltage sensing device

The invention relates to a voltage sensing device () for a high and/or medium voltage power carrying conductor (), the voltage sensing device comprising: a radially outer electrode () operable as a first sensing electrode of a sensing capacitor for sensing the voltage of the power carrying conductor; a radially inner electrode () operable as a second sensing electrode of the sensing capacitor; a dielectric material () arranged between the inner and the outer electrode (), wherein the coefficient of thermal expansion of the material of at least one electrode () is selected such that it compensates the temperature dependent parameters of the dielectric material () and/or the other electrode (), that influences the capacity of the voltage sensing capacitor.

Voltage sensor () for a high- or medium-voltage power-carrying conductor for a power network, such as an inner conductor of a power cable or a cable connector or a bus bar. The voltage sensor has a tubular shape and an axial passageway (), which can receive the conductor. The voltage sensing device comprises a) a radially-inner electrode (), operable as a first sensing electrode of a sensing capacitor for sensing the voltage of the power-carrying conductor, b) a radially-outer electrode (), operable as a second sensing electrode of the sensing capacitor, and c) a solid carrier element (), at least a first portion of which is arranged between the inner electrode and the outer electrode, the first portion being operable as a dielectric of the sensing capacitor. The sensor can be accommodated in a cable accessory. The carrier element may comprise ceramic material to increase accuracy.

Voltage Sensor

A terminal connection device for connecting an end of a medium- or high-voltage power cable to a connection point comprises a) an interface cable having first and second end portions, comprising an inner conductor and a conductive or semiconductive layer; b) a first stress control tube comprising a stress control element, and an insulating layer arranged around the stress control element, wherein the first stress control tube is mounted on the first end portion of the interface cable; c) a first cable connector for connecting the interface cable to the power cable, the first cable connector being connected to the second end portion of the interface cable; and d) one or more tubular shrinkable sleeves, at least a portion of one of the tubular shrinkable sleeves extending over at least a portion of the first stress control tube wherein the portion of the tubular shrinkable sleeve extending over at least a portion of the first stress control tube is shrunk down around at least a portion of the first stress control tube.

Terminal connection device for a power cable

A conductor assembly for a power network includes an inner conductor defining radial and axial directions, an insulating layer arranged around at least an axial section of the inner conductor, and a sensing electrode arranged radially outward of the insulating layer. The sensing electrode is operable as a first electrode of a sensing capacitor of a capacitive voltage sensor, in which sensing capacitor the inner conductor is operable as a second electrode. The conductor assembly further includes an electrically insulating spacer element arranged radially between the insulating layer and the sensing electrode.

Conductor assembly

A conductor assembly for a power network includes an inner conductor, an insulating layer arranged concentrically around the inner conductor, and a sensing electrode, arranged radially outward of the insulating layer, and operable as a first electrode of a sensing capacitor of a voltage sensor. The conductor assembly further includes a voltage pickup element having electrically conductive major surfaces, the first major surface being in a surface contact with the sensing electrode. The conductor assembly further includes an electrode wire, in electrical and mechanical contact with the voltage pickup element, for electrically connecting the voltage pickup element with an electric or electronic component disposed remote from the sensing electrode.

Sensored cable () for distribution of electrical power in a power network, the sensored cable comprising an inner conductor and an insulating layer () arranged concentrically around at least an axial section of the inner conductor. The sensored cable further comprises a capacitive voltage sensor () for sensing a voltage of the inner conductor, characterized by the sensor including a printed circuit board element (), which is placed over an electrically isolated piece () of conductive or semiconductive material, arranged on the insulating layer of the cable. The electrically isolated piece () of conductive or semiconductive material is operable to form an electrode of a sensing capacitor of the capacitive voltage sensor. The cable may comprise a (semi-) conductive layer (). The electrically isolated piece () of conductive or semiconductive material may comprise a portion of the (semi-) conductive layer.

Sensored cable for a power network

Sleeve () for a high- or medium-voltage power cable () having an inner conductor (). The sleeve comprises (i) a tubular sleeve body () having an electrically conductive or semiconductive first axial electrode section (), and (ii) a circuit board (). The sleeve is radially expandable or shrinkable. It can be arranged radially outward of the inner conductor, such hat the first axial electrode section is radially separated from the inner conductor by at least an electrically insulating spacer layer (). The circuit board is at least partially arranged radially outward of the sleeve body and comprises an electrical contact () which is electrically connected with the first axial electrode section.

Sleeve for a power cable

Terminal connection device for connecting an end of a medium- or high-voltage power cable to a connection point, comprising an interface cable, an inner conductor and a conductive or semiconductive layer. The terminal connection device further comprises a first stress control tube comprising a stress control element and an insulation layer arranged around the stress control element. The terminal connection device further comprises a first cable connector for connecting the interface cable to the power cable. The terminal connection device further comprises a second stress control tube comprising a stress control element and an insulating layer arranged around the stress control element, wherein the second stress control tube is mounted over the second end portion of the interface cable and at least a portion of the first cable connector. The terminal connection device further comprises one or more tubular shrinkable sleeves.

Growing community of inventors

Uedem, Germany

Michael H Stalder