摘要:
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 (θn) 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′).
摘要翻译:电流互感器包括每个包括罗戈夫斯基型绕组(C SUB)的至少两个部分电路(CB SUB),每个所述部分电路以 完整电路(CB)的角部分,其围绕360°的变压器的至少一个主导体(10,10A,10B,10C)。 每个部分电路(CB n N)的绕组(C> N)由绕组(C> 0 0 is is is is is is is winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding winding (C n N n N),其在部分电路(CB)的角度范围内延伸。 对于每个部分电路(CB n N),绕组和返回绕组串联电连接,两个绕组绕相同方向缠绕,以便形成单个绕组(C> n) SUB>),其呈现连接到采集系统(7,7')的一对相邻的电气终端(T 1 N 2,T 2n 2 N)。
摘要:
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 (θn) 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′).
摘要:
A method and system of non-intrusively monitoring the proportion of a component in a gaseous mixture having at least two components and contained in an electrical switchgear enclosure includes measuring the pressure, the temperature, and the density of the gas mixture by using sensors mounted on said enclosure, and in determining said proportion by processing the measured values in a data-processing unit.
摘要:
The capacitor of high thermal stability includes a high-voltage electrode (HT) extending in a longitudinal direction (AX), a cylindrical printed circuit (CI) coaxially surrounding said high-voltage electrode and including an electrically conductive track forming a low-voltage electrode (BT), and a frame (CH) having a cylindrical inside surface (SI) coaxially surrounding said cylindrical printed circuit (CI). The printed circuit is slit along a generatrix (G1) of the cylinder that it forms and it is rigidly fixed to the inside surface by a fixing point (F1, F2). The frame includes guide means (A1, A2) for holding said printed circuit (CI) near the inside surface (SI) whilst allowing it to expand along said inside surface of the frame. This provides a capacitor of high thermal stability and very simple construction which is suitable for carrying out measurements on a gas-insulated high-voltage electrical line.
摘要:
A device for controlling a circuit-breaker intended for opening and closing this electric power cut-off device comprising a mobile contact, this control device comprising a motor with a rotary output shaft and being connected to power supply means and actuating means transforming the output displacement of the motor into a displacement of the contact, this device also comprising a mechanical spring arrangement involved in opening and closing the contact. The actuation means include a set of jointed elements providing the connection of the rotary shaft and of the ring, and, in the closed position of the contact, the set of jointed elements is near a dead centre position, a so-called open dead centre, the opening spring being only able to drive it towards the open position upon moving past this dead centre during opening.
摘要:
The invention concerns a method for determining the reclose time of a circuit breaker on a three-phase high-voltage electric network after separation of contacts 7A, 8A, 7B, 8B, 7C, 8C in the presence of a fault on one of the three phases A, B or C, the determination of the reclose time comprising the following steps: measuring the voltages ULA0, ULBO and ULCO, measuring voltage USAO, determining the voltage USA0, USB0, and USCO, calculating the differences ULAB, ULAC and ULBC, calculating the differences USAB, USAC, and USBC, determining the reclose time on the basis of the voltage differences.
摘要翻译:本发明涉及一种用于在存在接触件7A,8A,7B,8B,7C,8C的情况下,在三相高压电网上确定断路器的重合闸时间的方法 在三相A,B或C之一中的故障,重新闭合时间的确定包括以下步骤:测量电压UL A0,UL&lt; BO&lt;&gt;和UL&lt; SUB > CO SUB>,测量电压US SUB>,确定电压US A0,US B0,和US < ,计算差异UL,AB,UL,AC和UL BC,计算出差异US AB,US 根据电压差确定重合时间。
摘要:
The method is intended for use in a step-down high tension current measuring apparatus using the Faraday effect and including a Sagnac interferometer having an optical loop constituted by a fiber (47) surrounding the high tension conductor (11) conveying the alternating current to be measured and terminating at an integrated optical circuit (43) which delivers an output light beam to an electronic circuit with the optical power of the light beam having a component in its spectrum at a frequency which is a sinusoidal function of the phase difference generated by the Faraday effect, with the coefficient of proportionality being referred to as a scale factor. The method consists in periodically updating the scale factor used for interpreting measurements on the basis of D.C. components in the output signal from the interferometer which appear in response to two successive disturbances which modify the Faraday effect and which are caused by means of a test direct current taking two different successive values and applied to auxiliary coils (44, 45).
摘要:
The invention relates to a control device for controlling electrical switchgear, the control device including an actuating arm (8) having a connection point (8b) suitable for being moved along a closed line (L) including points P1, P2, and P3: during an opening stage for opening the moving contact, under the effect of a mechanical spring (12), from point P1 to point P2; during a re-cocking stage for re-cocking the mechanical spring (12), under the effect of a motor (10) being switched on, and while keeping the moving contact in the open position, from point P2 to point P3; and during a closure stage for closing the moving contact, also under the effect of the motor being switched on, from point P3 to P1.
摘要:
A method and a system for determining the density of an insulating gas in electrical apparatus in the vicinity of parts carrying electrical current, the method comprising the following steps: a) a reference temperature is measured outside the apparatus and in the vicinity thereof; b) the current passing through the apparatus is measured, and the temperature rise of the gas above the reference temperature is determined on the basis of gas temperature rise values as a function of current values and of various reference temperatures, said temperature rise values having been previously determined by testing or by a mathematical model; c) the gas temperature is computed by adding the reference temperature and the temperature rise; d) the gas pressure inside the apparatus is measured; and e) the density .rho. of the gas is computed on the basis of equations of state of the gas .rho.=F(T,P) which equations are tabulated data.
摘要:
A hybrid current limiter comprising a first winding of non-superconducting conductive material having a large number of turns and electrically connected in series with a superconductoring coil of low self-inductance and placed in a cryostat, and a second winding of non-superconducting conductive material having a small number of turns, said second winding being closely coupled with said first winding in such a manner as to obtain low overall inductance, the second winding being connected in parallel with the series circuit constituted by the first winding and the superconducting coil.