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1.发明公开Method for predicting and detecting current transformer saturation under sympathetic inrush 有权一种用于sympathisierendem浪涌下预测和电流互感器饱和的检测方法
公开(公告)号：EP2747229A1
公开(公告)日：2014-06-25
申请号：EP13306656.3
申请日：2013-12-03
发明人： Song, Juzhong
CPC分类号： H02H3/283 , G01R31/027 , H02H7/0455
摘要： There is provided a method for predicting a current transformer saturation, comprising: detecting a first current from a first current transformer at a high voltage side of a transformer and detecting a second current from a second current transformer at a low voltage side of the transformer; calculating a first fundamental vector, a first DC component and a first total RMS of the first current, and calculating a second fundamental vector, a second DC component and a second total RMS of the second current; and generating a prediction signal for the current transformer saturation according to the first fundamental vector, the first DC component, the first total RMS, the second fundamental vector, the second DC component and the second total RMS. The current transformer saturation may be predicted effectively before it triggers a differential protection of the transformer, thus a differential protection mal-operation of the transformer may be avoided.
摘要翻译： 本发明提供了用于预测电流互感器饱和的方法，包括：在一个变压器的高电压侧的检测从第一电流互感器的第一电流和所述变压器的低电压侧检测来自第二电流互感器的第二电流; 计算第一基本向量，第一DC分量和所述第一电流的第一总RMS，并计算第二基本矢量，第二DC分量和所述第二电流的第二总RMS; 和产生用于电流互感器饱和gemäß的预测信号，以所述第一基本向量，第一个直流分量，所述第一总RMS，第二基本矢量，第二DC分量和所述第二总RMS。 它触发变压器的差动保护，因而差动保护变压器的次操作可避免前的电流互感器饱和可有效地预测。
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公开(公告)号：EP2629314A1
公开(公告)日：2013-08-21
申请号：EP12815985.2
申请日：2012-07-10
申请人： Kodensya Co. Ltd.
发明人： KAI, Toshiyasu , HASE, Yoshihide
CPC分类号： H02H7/04 , H01H9/563 , H02H7/0455 , H02H9/002
摘要： There is provided with a transformer inrush current restraining control equipment that provide useful practice to effectively restrain transformer inrush current which would be inevitably caused whenever a transformer under out of service is going to be put into operation by the related breaker closing operation.
The transformer inrush current restraining control equipment 10 includes a voltage measuring unit 1; a true residual fluxes timing calculating unit 2; a core-flux calculating unit 3; a true residual flux calculating unit 4; a breaker closing phase angular timing calculating unit 5; a breaker closing phase angular timing controlling unit 6.摘要翻译： 提供了一种变压器浪涌电流抑制控制设备，其提供了有用的实践来有效地抑制变压器涌入电流，这种变压器浪涌电流在变压器停止运行时将通过相关的断路器闭合操作而投入运行时将不可避免地引起。 变压器涌浪抑制控制装置10具有电压测量部1， 真实剩余流量定时计算单元2; 铁心磁通计算部3， 真实剩余流量计算单元4; 断路器闭合相位角定时计算单元5; 断路器闭合相位角定时控制单元6。
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3.发明公开Dispositif et procédé de protection de défaut terre 有权Vorrichtung und Verfahren zum Schutz gegen einen Erdfehlerstrom
公开(公告)号：EP2259402A1
公开(公告)日：2010-12-08
申请号：EP10354019.1
申请日：2010-05-07
发明人： Drouere, Bernard
CPC分类号： H02H7/0455 , H02H3/165 , H02H3/34
摘要： Le dispositif de protection terre pour un appareil électrique triphasé comporte une unité de traitement (12). L'unité de traitement comporte des moyens (6, 7) de d'analyse fournissant pour chaque phase un signal (H1, Ixhl) représentatif d'une la fréquence fondamentale et un signal (H2, Ixh2) représentatif d'une seconde harmonique de courant, et des moyens (20) de retenue de la seconde harmonique pour bloquer la détection de défaut terre lorsqu'un taux de seconde d'harmonique est atteint. Des premiers moyens (17, 17A, 17B, 17C, 170, 21-31) de détection détectent des courants monophasés comportant un taux (TH2) individuel de seconde harmonique supérieur à un premier seuil haut (SH) pour débloquer l'action des moyens de retenue de la seconde harmonique. Le procédé a une étape de détection un taux (TH2) individuel de seconde harmonique pour débloquer l'action de la retenue de la seconde harmonique
摘要翻译： 该装置具有处理单元（12），该处理单元（12）包括提供表示电流基频的信号（H1）的分析单元，并提供表示电流的二次谐波的信号（H2）。 当达到二次谐波的速率时，保持单元（16）阻止接地故障的检测。 检测器（17,17A，17B，17C）检测具有大于高阈值的单个二次谐波速率的单相电流，以便能够检测保持单元的接地故障和/或阻塞动作。 对于三相电气设备的接地故障保护方法，还包括独立权利要求。
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公开(公告)号：EP0637865B1
公开(公告)日：1998-07-08
申请号：EP94115566.5
申请日：1991-04-12
IPC分类号： H02H7/045
CPC分类号： G06F11/1435 , H02H7/0455
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公开(公告)号：EP0637865A3
公开(公告)日：1995-03-22
申请号：EP94115566.5
申请日：1991-04-12
IPC分类号： H02H7/045
CPC分类号： G06F11/1435 , H02H7/0455
摘要： The reliability of transformer differential relays is enhanced by providing a method and apparatus which enable improved discrimination between transformer current differentials due to transformer inrush current and current differentials due the occurrence of an internal fault. This improvement in discrimination is provided by generating a first signal representative of currents flowing in at least two windings of the transformer, a second signal representative of a positive portion of the first signal, and a third signal representative of a negative portions of the first signal. A first output signal is generated when the magnitude of the second signal exceeds a first predetermined value, and a second output signal is generated when the magnitude of the third signal exceeds a second predetermined value. A trip signal is generated upon coincidence of the first and second output signals. Additional operate energy is generated when the magnitude of the absolute value of a vector sum operate signal, representative of the vector sum of currents flowing in at least two windings of the transformer, exceeds a first predetermined magnitude. The additional operate energy is terminated and additional restraint energy is generated when the magnitude of a percentage restraint signal, representative of the absolute values of currents flowing in a least two windings of the transformer, exceeds a second predetermined magnitude for a predetermined period of time.
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6.发明授权Method for predicting and detecting current transformer saturation under sympathetic inrush 有权交流涌流下电流互感器饱和的预测与检测方法
公开(公告)号：EP2747229B1
公开(公告)日：2017-11-22
申请号：EP13306656.3
申请日：2013-12-03
发明人： Song, Juzhong
CPC分类号： H02H3/283 , G01R31/027 , H02H7/0455
摘要： There is provided a method for predicting a current transformer saturation, comprising: detecting a first current from a first current transformer at a high voltage side of a transformer and detecting a second current from a second current transformer at a low voltage side of the transformer; calculating a first fundamental vector, a first DC component and a first total RMS of the first current, and calculating a second fundamental vector, a second DC component and a second total RMS of the second current; and generating a prediction signal for the current transformer saturation according to the first fundamental vector, the first DC component, the first total RMS, the second fundamental vector, the second DC component and the second total RMS. The current transformer saturation may be predicted effectively before it triggers a differential protection of the transformer, thus a differential protection mal-operation of the transformer may be avoided.
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7.发明公开METHOD AND APPARATUS FOR PROTECTING POWER TRANSFORMERS FROM LARGE ELECTRO-MAGNETIC DISTURBANCES 审中-公开用于保护来自电磁故障的电磁故障的方法和装置
公开(公告)号：EP2841955A4
公开(公告)日：2015-12-23
申请号：EP13781983
申请日：2013-03-17
发明人： HOFFMAN GARY R , KWON EDWARD S , CAI HONG
CPC分类号： G01R31/027 , G01R31/1227 , H02H3/093 , H02H3/52 , H02H5/005 , H02H7/04 , H02H7/0455
摘要： A protective system far a power transformer having a neutral line connected to ground where large currents can flow in the neutral line due to electro-magnetic disturbances. The system includes circuitry for: (a) sensing the current level in the neutral line and whether it exceeds a predetermined threshold for a predetermined period; and (b) sensing and processing the harmonic content of the load current and determining the existence of certain relationships of the “even” and “odd” harmonics. Signals, including alarms, indicative of excessive conditions are produced. The system may also include circuitry for sensing the load current level and generating a signal alarm if the load level is above a given value when the harmonics and the DC current have values in excess of certain predetermined values.
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公开(公告)号：EP2329574B1
公开(公告)日：2015-10-28
申请号：EP09782958.4
申请日：2009-09-14
IPC分类号： H02H1/04
CPC分类号： H02H1/04 , H02H3/44 , H02H7/0455
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公开(公告)号：EP2223404A4
公开(公告)日：2013-12-25
申请号：EP08857782
申请日：2008-11-21
CPC分类号： H02H7/0455 , H02H1/043 , H02H3/44
摘要： A differential protection system for power transformers using Rogowski coils as current sensors can support an inrush current detection method based on sensing lows in the derivative of the sensed current. Effective detection of power transformer inrush conditions can enable blocking of a protection relay during inrush where the differential current may exceed a differential threshold value indicative of a fault without the presence of an actual fault. The outputs of the Rogowski coils, being proportional to the first time derivative of the sensed current, may be useful in the inrush detection method. Also, with reduced saturation concerns, the Rogowski coil protection system may employ a single slope response with increased sensitivity. A discrete time sampling technique for identifying low di/dt portions within the sensed current also may be useful in detecting power transformer inrush conditions.
摘要翻译： 使用罗柯夫斯基线圈作为电流传感器的电力变压器的差动保护系统可以支持基于感应电流导数中的低电平检测的浪涌电流检测方法。 电涌互感器浪涌条件的有效检测可以在浪涌期间阻断保护继电器，其中差动电流可能超过指示故障的差动阈值而不存在实际故障。 Rogowski线圈的输出与感应电流的一阶导数成正比，在涌入检测方法中可能很有用。 此外，随着饱和度降低，罗高夫斯基线圈保护系统可能会采用单一斜率响应，并提高灵敏度。 用于识别感测电流内的低di / dt部分的离散时间采样技术在检测电力变压器涌入情况中也可能是有用的。
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公开(公告)号：EP2223404A1
公开(公告)日：2010-09-01
申请号：EP08857782.0
申请日：2008-11-21
IPC分类号： H02H7/04
CPC分类号： H02H7/0455 , H02H1/043 , H02H3/44
摘要： A differential protection system for power transformers using Rogowski coils as current sensors can support an inrush current detection method based on sensing lows in the derivative of the sensed current. Effective detection of power transformer inrush conditions can enable blocking of a protection relay during inrush where the differential current may exceed a differential threshold value indicative of a fault without the presence of an actual fault. The outputs of the Rogowski coils, being proportional to the first time derivative of the sensed current, may be useful in the inrush detection method. Also, with reduced saturation concerns, the Rogowski coil protection system may employ a single slope response with increased sensitivity. A discrete time sampling technique for identifying low di/dt portions within the sensed current also may be useful in detecting power transformer inrush conditions.
摘要翻译： 使用罗柯夫斯基线圈作为电流传感器的电力变压器的差动保护系统可以支持基于感应电流导数中的低电平检测的浪涌电流检测方法。 电涌互感器浪涌条件的有效检测可以在浪涌期间阻断保护继电器，其中差动电流可能超过指示故障的差动阈值而不存在实际故障。 Rogowski线圈的输出与感应电流的一阶导数成正比，在涌入检测方法中可能很有用。 此外，随着饱和度降低，罗高夫斯基线圈保护系统可能会采用单一斜率响应，并提高灵敏度。 用于识别感测电流内的低di / dt部分的离散时间采样技术在检测电力变压器涌入情况中也可能是有用的。
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