Ripd Research and IP Development Ltd.

Raycap S.a.

Ripd IP Development Ltd

Raycap IP Development Ltd

Raycap Intellectual Property Ltd.

Raycap IP Assets Ltd

Fotis Xepapas

Zafiris G Politis

Grigoris Kostakis

Alexis Chorozoglou

Christos Prevezianos

George Peppas

Tine Tavcar

Sasa Rustja

Kostas Bakatsias

Megaklis Marathias

Shawn Warner

Michael Bloxham

Anestis Kolovos

Evaggelia Giannelaki

Nikolaol Tsakiridis

Kostas Samaras

A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.

Devices for active overvoltage protection including varistors and thyristors

Devices for active overvoltage protection

An overvoltage protection device includes a first electrode member, a second electrode member, and a varistor assembly. The varistor assembly includes: a plurality of varistor wafers each formed of a varistor material; and at least one electrically conductive interconnect member connecting the varistor wafers in electrical parallel between the first and second electrode members. The varistor wafers are axially stacked between the first and second electrodes.

Overvoltage protection device including multiple varistor wafers

An inductor assembly includes a coil including a spirally wound metal foil.

Inductor assemblies

A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (V) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (V) from a DC power supply and generates an output voltage (V) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the Vmeasurement and then adds different voltage steps to Vso Vcompensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.

Power transmission system for wireless communication systems

An overvoltage protection device includes first and second electrically conductive electrode members and a varistor member formed of a varistor material and electrically connected with each of the first and second electrode members. The overvoltage protection device has an integral fail-safe mechanism operative to electrically short circuit the first and second electrode members about the varistor member by fusing first and second metal surfaces in the overvoltage protection device to one another using an electric arc.

Overvoltage protection devices including wafer of varistor material

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Drama, Greece

Fotis Xepapas