Abstract: A device (10) for measuring space charge in a high-voltage direct current electric cable includes a DC voltage source (12), a voltage step generator (14), a first electrode (16) connected to the DC voltage source (12) and to the voltage step generator (14), a second electrode (18) that is grounded, a piezoelectric sensor (20) connected to the second electrode (18), an electrical-signal amplifier (22) connected to the piezoelectric sensor (20), and at least one specimen (24) of the electric cable placed between the first and second electrodes (16, 18) and including a cut of the cable made to a predetermined depth in the electrical insulation system of the cable. The amplitude of the signal measured at the output of the amplifier (22) is related to the charge density in the specimen (24) and the delay related to the distance of the charges from the piezoelectric sensor (20) giving the position of the charges.

Abstract: A system (100) for determination of a quantity of emissions of carbon dioxide resulting from the heating of an electrical conductor of an electrical cable by the Joule effect includes an electrical cable (10) having at least one electrical conductor (12) and at least one layer of material surrounding the at least one conductor, and a measurement unit (110) associated with the electrical cable. The measurement unit has at least one temperature sensor (20) and a device (112) for measurement of the electrical intensity Icond of an electrical current circulating in the electrical conductor. A calculation unit (120) is configured to communicate information with the measurement unit, the calculation unit being configured to determine the conductor temperature ?cond by means of the at least one temperature sensor.

Abstract: A system for determining a quantity of emissions of carbon dioxide resulting from the heating of an electrical conductor of an electric cable by the Joule effect, said determination system includes an electrical cable including at least one electrical conductor and at least one layer of material surrounding said at least one conductor, a measuring unit associated with the electrical cable, said measuring unit including at least one temperature sensor, a calculation unit being configured to communicate information with the measurement unit, the calculation unit being configured to determine the conductor temperature ?cond by means of said at least one temperature sensor, said calculation unit being further configured to determine an quantity of emissions of carbon dioxide resulting from the heating of the electrical conductor by the Joule effect as a function of the conductor temperature ?cond.

Abstract: A determination system (100) for non-invasively determining a temperature of a conductor of an electric cable includes an electric cable (10) with at least one electrical conductor (12) and at least one layer of material (14, 16) surrounding the at least one conductor. The at least one layer having a layer thermal resistance T1. At least one temperature sensor (20) is placed on an outer surface (18) of the at least one layer of material for measuring a peripheral temperature ?b1 on the outer surface of the at least one layer of material. A determination unit (22) is configured to determine a conductor temperature ?cond as a function of the measured peripheral temperature ?b1, the layer thermal resistance T1 and the heat flux Wc generated by the flow of an electrical current in the electrical conductor.

Abstract: A device (10) for applying and measuring a transient overvoltage in an electrical cable includes a test specimen representative of the electrical cable, a first DC voltage generator (DC1) designed to apply a predetermined DC voltage to the specimen, and a second DC voltage generator (DC2) designed to apply a predetermined overvoltage to the specimen. The device also has a high-voltage switch (12) that is connected to the second DC voltage generator (DC2) and is designed to convert the predetermined overvoltage into a square-wave voltage, a control resistor (R2) designed to monitor the voltage rise time of the specimen, and a decoupling capacitor (C1) designed to monitor the overvoltage fall time in the specimen.

Abstract: A device (10) for measuring space charge in a high-voltage direct current electric cable includes a DC voltage source (12), a voltage step generator (14), a first electrode (16) connected to the DC voltage source (12) and to the voltage step generator (14), a second electrode (18) that is grounded, a piezoelectric sensor (20) connected to the second electrode (18), an electrical-signal amplifier (22) connected to the piezoelectric sensor (20), and at least one specimen (24) of the electric cable placed between the first and second electrodes (16, 18) and including a cut of the cable made to a predetermined depth in the electrical insulation system of the cable. The amplitude of the signal measured at the output of the amplifier (22) is related to the charge density in the specimen (24) and the delay related to the distance of the charges from the piezoelectric sensor (20) giving the position of the charges.

Abstract: A device (10) for heating and simultaneously applying a high voltage to an electric cable (12) includes the electric cable (12), an inductive transformer (14) connected to the electric cable (12), designed to heat the electric cable (12) to a first predetermined temperature, and a high-voltage transformer (16) connected between the electric cable (12) and ground, designed to apply a predetermined voltage of between 100 kV and 300 kV to the electric cable (12).

Abstract: An electrical cable (100, 101) includes at least one elongated electrical conductor (1), at least one protective element (4, 41, 42) surrounding the elongated electrical conductor (1), and at least one filling compound (5) surrounded by said protective element (4, 41, 42). The filling compound (5) has more than 20.0% by weight of a mineral oil, relative to the total weight of the filling compound, and at least one nanofiller.