Abstract:
Voltage sensor (1) comprising a voltage divider (40) for sensing an AC voltage of a HV/MV power conductor (10). For adjusting the common overall impedance of the low-voltage portion of the voltage divider towards a desired impedance, the low-voltage portion (60) comprises one or more low-voltage impedance elements (110), a plurality of adjustment impedance elements (80) 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 (110). The overall impedance of the high-voltage portion (50) and the overall impedance of the low-voltage portion (60) of the voltage divider (40) are adapted such that, by bringing one or more of the switches (90) into their connect state, the voltage divider (40) 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.
Abstract:
Voltage divider assembly (1) for a voltage-dividing sensor for sensing a voltage of a MV/HV power conductor in a power network, comprising a) a plurality of discrete impedance elements (100), electrically connected in series with each other such as to be operable as a high-voltage cable side of the voltage-dividing sensor; b) a cable connector (150) for mechanical engagement with a cable plug (140) at an end of a tap cable (130) conducting the voltage of the power conductor to the voltage divider assembly. The cable connector (150) is electrically connected with one discrete impedance element (100a) of the plurality of discrete impedance elements (100, 100a).
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:
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.
Abstract:
Insulator (2) for a medium-voltage or high-voltage overhead power line conductor. The insulator comprises an insulator body (110) and a voltage sensor (10), embedded in the insulator body and comprising a first plurality of discrete impedance elements (30, 30b), electrically connected in series such as to be operable as a first voltage divider (70) for dividing and sensing the voltage of the overhead power line conductor.
Abstract:
Elastic sleeve (1) for electrically insulating a HV/MV power conductor in a power network, comprising a) a shrinkable or expandable elastic sleeve body (10); b) a receiving space (20) in the sleeve body, for receiving the power conductor; c) a cavity (30) formed in the sleeve body; and d) a divider assembly (40), 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.
Abstract:
The invention relates to a voltage sensing device (1) for a high and/or medium voltage power carrying conductor (2), the voltage sensing device comprising: a radially outer electrode (3) operable as a first sensing electrode of a sensing capacitor for sensing the voltage of the power carrying conductor; a radially inner electrode (2, 6) operable as a second sensing electrode of the sensing capacitor; a dielectric material (5) arranged between the inner and the outer electrode (3, 2, 6), wherein the coefficient of thermal expansion of the material of at least one electrode (3, 2, 6) is selected such that it compensates the temperature dependent parameters of the dielectric material (5) and/or the other electrode (3, 2, 6), that influences the capacity of the voltage sensing capacitor
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:
Conductor assembly (1) for a power network, which comprises - an inner conductor (5) defining radial and axial directions, - an insulating layer (10) arranged around at least an axial section of the inner conductor, and - a sensing electrode (40), arranged radially outward of the insulating layer, and 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 comprises an electrically insulating spacer element (25), arranged radially between the insulating layer and the sensing electrode.