Patents Assigned to Areva T&D SA
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Publication number: 20070140891Abstract: Process for the preparation of a semiconducting ceramic based on doped tin oxide SnO2 by a process of “PADO” (Precursor Alloy Direct Oxidation) type applied to an alloy of tin and of doping metals or by a process of “PADO” type applied to tin, the doping metals being added in the form of oxides to the powder subjected to sintering.Type: ApplicationFiled: October 3, 2006Publication date: June 21, 2007Applicant: AREVA T&D SAInventors: Mehrdad Hassanzadeh, Celine Machado-Bailly, Renaud Metz, Ramon Puyane
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Publication number: 20070111590Abstract: An electrical contact member, suitable for electrically interconnecting two conductive members in series, which members can move relative to each other and are part of an electrical apparatus. The electrical contact includes a strength-imparting base layer made of an electrically conductive material, and a coating layer formed from metallic silver and configured to come into contact with the two electrically conductive members. The coating layer has a micro-structure formed by pure silver crystals, with a presence of nodules made of silver and of an additional metallic material formed by at least one additional metal that is different from silver.Type: ApplicationFiled: December 28, 2004Publication date: May 17, 2007Applicant: AREVA T&D SAInventors: Jean-Luc Bessede, Pierre Giannini, Oana Visata
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Patent number: 7208958Abstract: A sensor for picking up partial discharges in an electrical equipment tank filled with a dielectric fluid includes an antenna responsive to the electromagnetic waves generated by such partial discharges. In the sensor, the antenna is formed by two electrodes that are separated from each other by a dielectric resonator. With this arrangement, the sensor has improved sensitivity in the UHF range, while being of dimensions that are considerably smaller than dimensions of a conventional antenna for use in the UHF range.Type: GrantFiled: February 25, 2004Date of Patent: April 24, 2007Assignee: Areva T&D SAInventor: Kuppuswamy Raja
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Patent number: 7199324Abstract: The invention relates to a hybrid circuit-breaker which, for each pole, comprises a dielectric-gas interrupting chamber (1) which contains a first contact (1A) and a moving second contact (1B) that are disposed longitudinally to a first axis (AA?) and in which the first contact (1A) is connected to a first terminal (3A) of the network, said interrupting chamber (1) being connected in series with a vacuum bottle (2) which contains a fixed contact (2A) and a moving contact (2B) that are disposed longitudinally to a second axis (BB?) and in which the fixed contact (2A) is connected to a second terminal (3B) of the network, actuating means acting via a single control (4) to move said moving contacts between respective open positions and respective closed positions.Type: GrantFiled: March 25, 2005Date of Patent: April 3, 2007Assignee: Areva T & D SAInventor: Michel Perret
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Patent number: 7183774Abstract: The invention provides a method of detecting partial discharges in an electrical appliance insulated in a receptacle and a system of diagnosing the state of the appliance using this method. With the help of an UHF antenna placed in the receptacle of the appliance, the method includes analyzing the spectrum (RS1) of the electromagnetic signal picked up by the antenna and of identifying within the spectrum one or more frequencies of interest (B1, B2), for each of which the signal has an amplitude greater than a predetermined threshold value. To identify the frequency/frequencies of interest, the spectrum of the signal received by the antenna is compared with a reference spectrum (RS2).Type: GrantFiled: June 1, 2004Date of Patent: February 27, 2007Assignee: Areva T&D SAInventor: Raja Kuppuswamy
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Patent number: 7161873Abstract: A method of detecting and localizing a source of partial discharge in an electrical apparatus placed in an enclosure containing an acoustically-conductive fluid.Type: GrantFiled: March 25, 2005Date of Patent: January 9, 2007Assignee: Areva T&D SAInventors: Raja Kuppuswamy, Sebastien Louise, Niemet Nzihou
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Publication number: 20060259281Abstract: This invention relates to a method for detection of the position of a wave front in a signal received by a detector. This method consists of: converting the signal into a digital signal, defining a working group of N successive samples in the digital signal, and possibly processing the samples in the working group, calculating the energy of the signal from the processed samples in the working group, if any, in terms of the root mean square over a sliding window, the window comprising an optimum number Lopt of samples (Lopt is less than N), the position of the wave front corresponding to the position of the sample for which the energy of the signal exceeds a threshold D that depends on the value of the energy of the signal previously at the wave front, for the first time.Type: ApplicationFiled: March 27, 2006Publication date: November 16, 2006Applicant: AREVA T&D SAInventors: Raja Kuppuswamy, Philip Moore, IIiana Portugues, Sebastien Louise
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Patent number: 7102866Abstract: A protection system for an electrical power line system of the type comprising radially connected power line sections, wherein a first electrically upstream one of the line sections is connectable to a power source. The protection system comprises at least one relay installed at or near at least the upstream end of each line section to protect that line section, each relay having an associated circuit breaker. The relays are provided with a first set of accelerated overcurrent functions and a second set of under-current/under-voltage functions, the relays being directional and the first and second sets of functions being time graded in reverse to each other.Type: GrantFiled: May 7, 2003Date of Patent: September 5, 2006Assignee: Areva T&D SAInventor: Zhiqian Bo
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Patent number: 7090176Abstract: A support for high-voltage or medium-voltage electrical plant comprises four columns placed on a support surface and connected in pairs by crossmember assemblies. The columns are each articulated to rotate about a first horizontal axis at their end resting on the support surface and about a second horizontal axis on a top crossmember at their other end. The first and second axes are parallel. Two opposite crossmember assemblies allow the two columns connected by one or the other of these two assemblies to move in a stable manner in their rotation plane.Type: GrantFiled: February 17, 2004Date of Patent: August 15, 2006Assignee: Areva T&D SAInventors: Michel Chavot, Jean Louis Habert
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Publication number: 20060145705Abstract: A sensor for picking up partial discharges in an electrical equipment tank filled with a dielectric fluid includes an antenna responsive to the electromagnetic waves generated by such partial discharges. In the sensor, the antenna is formed by two electrodes that are separated from each other by a dielectric resonator. With this arrangement, the sensor has improved sensitivity in the UHF range, while being of dimensions that are considerably smaller than dimensions of a conventional antenna for use in the UHF range.Type: ApplicationFiled: February 25, 2004Publication date: July 6, 2006Applicant: AREVA T&D SAInventor: Kuppuswamy Raja
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Publication number: 20060091112Abstract: A device for the actuation of the movable contacts of a hybrid circuit breaker allows the following time diagram to be implemented: command the opening of the interrupting chamber, offset the opening of the vacuum switch so as to allow the interrupting chamber contacts to separate at a minimum speed and in a way that is synchronous with the separation of the vacuum switch contacts, close the vacuum switch while keeping the interrupting chamber in the open position. Moreover, closing the interrupting chamber does not act upon the contacts of the vacuum switch. The actuation device can be found in a number of embodiments, and allows the vacuum interrupter to be controlled when the circuit breaker is triggered or closed.Type: ApplicationFiled: October 21, 2005Publication date: May 4, 2006Applicant: AREVA T&D SAInventors: Andre Neveu, Andre Cimala, Alain Girodet, Mehdi Lebiad, Gwenael Marquezin
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Publication number: 20060039171Abstract: The invention relates to an on-load transformer tap changing system wherein the secondary or primary of a transformer comprises at least one first and one second taps (p1, p2). A main connection circuit (tra-I2) is used for the permanent connection of the first tap (p1) or the second tap (p2) to an output terminal (b2) of the secondary or primary of the transformer. Secondary connection circuits (I1, I3) are each used to connect a tap (p1, p2) temporarily and directly to said output terminal (b2) of the secondary or primary of the transformer. Each of said connection circuits (I1, tra-I2, I3) comprises one or more insulated gate bipolar transistors and the system can be controlled without zero current value transition detection in the secondary winding. Application: Power transformers.Type: ApplicationFiled: July 19, 2005Publication date: February 23, 2006Applicant: AREVA T&D SAInventors: Jean-Paul Lavieville, Witold Weber, Mohamed Ryadi, Milan Saravolac
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Patent number: 6995330Abstract: A high for medium voltage gas insulated earthing switch comprises at least one conducting bar in an enclosure, with a corresponding earthing contact and a phase contact fixed to the said bar that will be electrically connected to the earthing contact to earth the said bar. The earthing contact is installed fixed in the enclosure facing the phase contact, leaving a free space (E) between this phase contact and the earthing contact. A switching element is installed free to move in the enclosure between the phase contact and the earthing contact, and comprises firstly a switching contact that short circuits the space left free (E) to electrically connect the earthing contact and the phase contact when the earthing switch is closed, and secondly an at least partly electrically insulating support on which the switching contact is fixed such that the switching contact is electrically isolated from the phase contact and from the earthing contact when the earthing switch is in an open position.Type: GrantFiled: August 16, 2004Date of Patent: February 7, 2006Assignee: Areva T & D SAInventor: Carmelo Gimeno
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Publication number: 20050248430Abstract: The current transformer comprises at least two partial circuits (CBn) each comprising a Rogowski type winding (Cn), each of said the partial circuits being made in the form of an angular portion of a complete circuit (CB) which surrounds at least one primary conductor (10, 10A, 10B, 10C) of the transformer over 360°. The winding (Cn) of each partial circuit (CBn) is constituted by a go winding (Cn0) and by a return winding (Cn1) which extend over the angular extent (?n) of the partial circuit (CBn). For each partial circuit (CBn), the go and return windings are electrically connected in series, both having turns wound in the same direction so as to form a single winding (Cn) which presents a pair of adjacent electrical terminations (T1n, T2n) connected to an acquisition system (7, 7?).Type: ApplicationFiled: May 6, 2005Publication date: November 10, 2005Applicant: AREVA T&D SAInventors: Jean-Pierre Dupraz, Lionel Lucot, Olivier Chuniaud, Bernard Regnier
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Publication number: 20050243649Abstract: A method of detecting and localizing a source of partial discharge in an electrical apparatus placed in an enclosure containing an acoustically-conductive fluid.Type: ApplicationFiled: March 25, 2005Publication date: November 3, 2005Applicant: AREVA T&D SAInventors: Raja Kuppuswamy, Sebastien Louise, Niemet Nzihou
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Publication number: 20050205726Abstract: A support for high-voltage or medium-voltage electrical plant comprises four columns placed on a support surface and connected in pairs by crossmember assemblies. The columns are each articulated to rotate about a first horizontal axis at their end resting on the support surface and about a second horizontal axis on a top crossmember at their other end. The first and second axes are parallel. Two opposite crossmember assemblies allow the two columns connected by one or the other of these two assemblies to move in a stable manner in their rotation plane.Type: ApplicationFiled: February 17, 2004Publication date: September 22, 2005Applicant: AREVA T&D SAInventors: Michel Chavot, Jean Habert
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Patent number: 6917006Abstract: An operating mechanism for a rectilinear motion circuit-breaker, for performing an open-close-reopen cycle, and operating on an operating rod of the circuit-breaker and including closing and opening springs. The opening spring operates on the operating rod. The closing spring operates on a crank end whose other end is connected to a shaft fastened to a flywheel and on which is mounted a closing cam cooperating with a roller on the operating rod. A closing pawl retains the closing spring in a compressed position, opening the closing pawl releasing the closing spring to rotate the cam, thereby closing the circuit-breaker and rearming the opening spring. A rearming motor couples to the shaft by a freewheel. A pawl triggers opening retaining the operating rod against force of the opening spring in the closed position of the circuit-breaker and is adapted to receive an opening command.Type: GrantFiled: February 14, 2003Date of Patent: July 12, 2005Assignee: Areva T&D SAInventor: Félix Bachofen
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Publication number: 20050099187Abstract: This invention relates to a method of diagnosing one fault on a transformer winding using a Frequency Response Analysis (FRA). This invention is adapted more particularly to power transformers. The method comprises the following steps: measure the impedance of the said winding as a function of the frequency, the said measurement being represented in the form of a first voltage gain k, compare the said impedance measurement with a reference measurement represented in the form of a second voltage gain k?. The method also comprises a step to determine the relative variation of the first resonant frequency exceeding 10 kHz, the said relative variation being obtained by comparing the said first and second gains k and k?.Type: ApplicationFiled: October 1, 2004Publication date: May 12, 2005Applicant: AREVA T&D SAInventor: Simon Ryder
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Publication number: 20040246000Abstract: Method for detecting partial discharges and diagnostic system for electrical apparatus.Type: ApplicationFiled: June 1, 2004Publication date: December 9, 2004Applicant: AREVA T&D SAInventor: Raja Kuppuswamy