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公开(公告)号：EP0453196A3
公开(公告)日：1993-03-03
申请号：EP91303273.6
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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22.发明授权
公开(公告)号：EP2841955B1
公开(公告)日：2018-12-12
申请号：EP13781983.5
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：EP2259402B1
公开(公告)日：2018-03-14
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
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公开(公告)号：EP3207611A1
公开(公告)日：2017-08-23
申请号：EP15766537.3
申请日：2015-09-22
申请人： ABB Schweiz AG
发明人： TURNER, Robert
CPC分类号： H02H9/002 , H02H7/0455 , H02H9/045 , H02M1/36 , H02M1/40 , H02M1/42 , H02M5/12 , H02M5/22 , H02M7/12 , H02M7/48 , H02M2007/4835
摘要： The present invention is concerned with pre-magnetizing a Modular Multilevel power Converters (MMC) connected transformer in order to moderate inrush currents upon connecting the transformer to an electric grid. The invention takes advantage of the high amount of stored energy in MMC converters as compared to other converter types. This stored energy is used to pre-magnetize the converter-connected transformer, therefore no additional or dedicated pre-magnetizing hardware is required in addition to the charging hardware provided to charge the converter capacitors. As the transformer pre-magnetizing takes place subsequent to the converter charging, the converter charging circuit is not used to, and therefore does not need to be designed to, directly magnetize the transformer.
摘要翻译： 本发明涉及将模块化多级功率转换器（MMC）连接的变压器预磁化，以便在将变压器连接到电网时缓和涌入电流。 与其他转换器类型相比，本发明利用MMC转换器中存储的大量能量。 该存储的能量用于预先磁化转换器连接的变压器，因此除了用于对转换器电容器充电的充电硬件之外，不需要额外的或专用的预充磁硬件。 由于变换器预充磁发生在变换器充电之后，因此变换器充电电路不被使用，因此不需要被设计成直接磁化变压器。
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公开(公告)号：EP2629314B1
公开(公告)日：2016-12-14
申请号：EP12815985.2
申请日：2012-07-10
申请人： Kodensya co., ltd.
发明人： KAI, Toshiyasu , HASE, Yoshihide
IPC分类号： H02H7/045
CPC分类号： H02H7/04 , H01H9/563 , H02H7/0455 , H02H9/002
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26.发明公开Premagentizing of MMC connected transformer 审中-公开Vormagnetisierung von MMC-verbundenem Transformator
公开(公告)号：EP3010104A1
公开(公告)日：2016-04-20
申请号：EP14189388.3
申请日：2014-10-17
申请人： ABB Technology AG
发明人： Turner, Robert
CPC分类号： H02H9/002 , H02H7/0455 , H02H9/045 , H02M1/36 , H02M1/40 , H02M1/42 , H02M5/12 , H02M5/22 , H02M7/12 , H02M7/48 , H02M2007/4835
摘要： The present invention is concerned with pre-magnetizing a Modular Multilevel power Converters (MMC) connected transformer in order to moderate inrush currents upon connecting the transformer to an electric grid. The invention takes advantage of the high amount of stored energy in MMC converters as compared to other converter types. This stored energy is used to pre-magnetize the converter-connected transformer, therefore no additional or dedicated pre-magnetizing hardware is required in addition to the charging hardware provided to charge the converter capacitors. As the transformer pre-magnetizing takes place subsequent to the converter charging, the converter charging circuit is not used to, and therefore does not need to be designed to, directly magnetize the transformer.
摘要翻译： 本发明涉及对连接变压器的模块化多电平功率转换器（MMC）进行预磁化，以便在将变压器连接到电网时调节浪涌电流。 与其他转换器类型相比，本发明利用了MMC转换器中大量的存储能量。 这种存储的能量用于对转换器连接的变压器进行预磁化，因此除了为转换器电容器充电之外，还需要额外的或专用的预励磁硬件。 由于变压器预充电发生在转换器充电之后，转换器充电电路不用于直接磁化变压器，因此不需要设计。
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27.发明公开DIFFERENTIALSCHUTZVERFAHREN UND SCHUTZGERÄT ZUM DURCHFÜHREN EINES DIFFERENTIALSCHUTZVERFAHRENS 审中-公开用于执行差动保护方法差动保护的方法和装置
公开(公告)号：EP2901534A1
公开(公告)日：2015-08-05
申请号：EP12801494.1
申请日：2012-11-26
发明人： MIESKE, Frank
IPC分类号： H02H3/28
CPC分类号： G01R31/088 , G01R19/10 , G01R31/40 , H02H3/283 , H02H7/045 , H02H7/0455
摘要： The invention relates to a differential protection method for generating a fault signal (F), wherein current measurement values are in each case measured on at least two different measuring points (12a, 12b) of a component, differential current values and stabilising values are formed using the current measurement values, and the fault signal (F) is generated when in the context of a tripping range test it is ascertained that a measured value pair formed using one of the differential current values and the respective associated stabilising value lies in a predetermined tripping range (30). In order that in the event of transducer saturation it is possible to distinguish selectively between an external fault and an internal fault and to generate a fault signal with high security if an internal fault is ascertained, differential current values are estimated from successive differential current values and associated stabilising values and associated estimated stabilising values differential current values and associated estimated stabilising values are formed, by means of which at least one value of an expected future trend of the differential current values and of the stabilising current values is estimated, and for the tripping range test the position of a measured value pair formed from an estimated differential current value and the respective associated estimated stabilising value. The invention further relates to an electrical protective device (10) having a correspondingly designed evaluation unit (40).
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公开(公告)号：EP2629314A4
公开(公告)日：2015-05-06
申请号：EP12815985
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
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公开(公告)号：EP2329574A1
公开(公告)日：2011-06-08
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
摘要： The invention relates to a method for generating an error signal (F) which indicates an error in an energy transmission system (11) (transmission system element), wherein as part of the method it is checked whether an activation process was carried out in the energy transmission system, and the generation of the error signal is blocked as long as the activation process continues. According to the invention, it is checked whether at least one current (I1, I2, I3, I4) of the three-phase energy transmission system has a flat current path for a predetermined minimum time interval per period of the current, and the generation of the error signal is blocked if the at least one current has a flat current path for the predetermined minimum time interval.
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公开(公告)号：EP0453196A2
公开(公告)日：1991-10-23
申请号：EP91303273.6
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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