3m Innovative Properties Company

Sebastian Eggert-Richter

Michael H Stalder

Jens Weichold

Mark Gravermann

Christian Weinmann

Bernd Schubert

Christine B Bund

Johannes Fink

Guenter M Zilligen

Gunther A J Stollwerck

Harald Westkamp

Mirco Gunjaca

Benhard C Schneider

Willy A Ahlmann

Paul H R Jolly

Guenther A J Stollwerck

Gunther AJ 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

Growing community of inventors

Wülfrath, Germany

Sebastian Eggert-Richter