Abstract:
Impedance assembly (2) for use in a voltage divider for sensing an AC voltage of at least 1 kV versus ground of a power-carrying conductor distributing electrical energy in a grid. The impedance assembly comprises a) a printed circuit board (131) comprising one or more dielectric board layers (210, 215, 220), b) an externally accessible high-voltage contact (100), c) an externally accessible low-voltage contact (110), spaced from the high-voltage contact by at least 30 mm, and d) at least two dividing capacitors (91), connected in series between the high- voltage contact and the low-voltage contact and operable as a high-voltage side of the voltage divider. Each dividing capacitor has two electrodes formed by conductive areas (301, 302, 303, 304, 305, 306), arranged on opposed surface portions of a specific dielectric board layer, and a dielectric comprising a portion of the specific dielectric board layer on which the electrodes are arranged. Instead of the dividing capacitors, the impedance assembly may comprise a resistor layer.
Abstract:
The invention relates to a voltage sensing device for a high and/or medium-voltage power-carrying conductor, the voltages sensing device comprising: • a carrier element (3) with a passageway for receiving the power-carrying conductor, • wherein the carrier element comprises an electrode (4) extending in an axial direction of the passageway of the carrier element and operable as a first electrode of the voltage sensing device, wherein • a conductor (1) of the power cable is operable as the second electrode of the voltage sensing device and wherein • the carrier element has a coefficient of thermal expansion that is less than 5x10^-6 1/K at 20 C.
Abstract:
Sensored cable (1) for distribution of electrical power in a power network, the sensored cable comprising an inner conductor and an insulating layer (10) arranged concentrically around at least an axial section of the inner conductor. The sensored cable further comprises a capacitive voltage sensor (100) for sensing a voltage of the inner conductor, characterized by the sensor including a printed circuit board element (60), which is placed over an electrically isolated piece (140) of conductive or semiconductive material, arranged on the insulating layer of the cable. The electrically isolated piece (140) 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 (20). The electrically isolated piece (40) of conductive or semiconductive material may comprise a portion of the (semi-) conductive layer.
Abstract:
Voltage sensing assembly (1), comprising a conductor assembly (10) having a power conductor (40) for conducting power in a high- or medium voltage power network, and a sensor circuit (20) for sensing an alternating voltage of the power conductor. The sensor circuit comprises a) a sensing capacitor (100) having a capacitance and comprising a first sensing electrode (60), a dielectric, and a second sensing electrode electrically connected with the power conductor or comprising a portion of the power conductor; and b) a measurement impedance (110), electrically arranged, in series with the sensing capacitor, between the first sensing electrode and electrical ground such that the sensing capacitor and the measurement impedance form a voltage divider. The sensor circuit can be brought into a measurement configuration or a calibration configuration.
Abstract:
The invention relates to a method for data acquisition of a signal representing a current or voltage of a power carrying conductor in a medium or high voltage power network, said signal comprising a waveform of continuously repeating elements, the method comprising the following steps: a) sampling the signal for a defined first time period to capture a first signal comprising a single period of the waveform with a sensing unit, wherein the sampling is stopped after the defined first time period for a defined second time period; b) transmitting the first signal with a communication unit from the sensing unit to a central unit; c) sampling the signal for the defined first time period after the end of the defined second time period with the sensing unit to capture a second signal comprising another single period of the waveform; d) transmitting the second signal with the communication unit from the sensing unit to the central unit; wherein the central unit copies the first signal until it receives the second signal form the sensing unit.
Abstract:
The invention relates to an energy harvesting device for an insulated power carrying conductor (1) of a power network, the energy harvesting device comprising: - an insulating layer (2) arranged concentrically around an axial section of the power carrying conductor (1); - a layer of conductive or semi-conductive material (3) arranged concentrically around at least an axial section of the insulating layer (2); - an electrode element (4) made out of a portion of the layer of conductive or semi-conductive material, wherein the electrode element is electrically isolated from the rest of the layer of conductive or semi-conductive material; - a harvesting capacitor, which is formed by the power carrying conductor being operable as one electrode and the electrode element of conductive or semi-conductive material being operable as another electrode; and - an electrical or electronic circuit for energy harvesting, which is electrically connected to the harvesting capacitor.
Abstract:
Voltage sensor (1) 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 (40), which can receive the conductor. The voltage sensing device comprises a) a radially-inner electrode (20), operable as a first sensing electrode of a sensing capacitor for sensing the voltage of the power-carrying conductor, b) a radially-outer electrode (30), operable as a second sensing electrode of the sensing capacitor, and c) a solid carrier element (10), 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.
Abstract:
Passive fibre-optic enclosure comprising, a) one or more fibre-optic functional units of a telecommunication network, optically connectable, via an optical fibre, with a central network unit, for receiving telecommunication signals for one or more subscribers via the optical fibre from the central network unit, characterized in that the enclosure further comprises, on the inside of the enclosure, b) transceiving means, which is operable to generate first optical signals using electrical energy, which is operable to receive optical response signals from the central network unit, which is optically connectable to the optical fibre such that the first optical signals can be transmitted by the optical fibre to the central network unit, and such that optical response signals can be transmitted by the optical fibre from the central network unit to the transceiving means.
Abstract:
Terminal connection device (10) for connecting an end of a medium- or high-voltage power cable (42) to a connection point, the terminal connection device (10) comprising an interface cable (12) having first and second end portions, comprising an inner conductor (14) and a conductive or semiconductive layer (18). The terminal connection device further comprises a first stress control tube (36) comprising - a stress control element (38), and an insulating layer (40) arranged around the stress control element (38), wherein the first stress control tube (36) is mounted on the first end portion of the interface cable (12). The terminal connection device further comprises a first cable connector (24) for connecting the interface cable (12) to the power cable (42), the first cable connector (24) being connected to the second end portion of the interface cable (12); The terminal connection device (10) further comprises a second stress control tube (36') comprising a stress control element (38), and an insulating layer (40) arranged around the stress control element (38), wherein the second stress control tube (36') is mounted over the second end portion of the interface cable (12) and at least a portion of the first cable connector (24); The terminal connection device further comprises one or more tubular shrinkable sleeves (52, 52', 52''). At least a portion of one of the tubular shrinkable sleeves (52, 52', 52'') extends over at least a portion of the first stress control tube (36). At least a portion of one of the tubular shrinkable sleeves (52, 52', 52'') extends over at least a portion of the second stress control tube (36'). The portion of the tubular shrinkable sleeve (52, 52'') extending over at least a portion of the first stress control tube (36) is shrunk down around at least a portion of the first stress control tube (36).