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公开(公告)号：US20090231769A1
公开(公告)日：2009-09-17
申请号：US12046250
申请日：2008-03-11
IPC分类号： H02H3/00
摘要： A negative sequence differential element may detect a fault in an electrical power system by computing a differential between negative sequence values derived from a first phase-current measurement and a second phase-current measurement. A transformer may be disposed between the first phase-current and second phase-current measurement location. The first phase-current measurement and the second phase-current measurement may be normalized and a negative sequence current may be calculated therefrom. The negative sequence currents may be used to calculate an operating quantity, which may be an absolute value of the sum of the first and second negative sequence currents, and a restraint quantity comprising a maximum of the first and second negative sequence currents. The restraint quantity may be scaled by a slope factor. A fault may be detected if the operating quantity exceeds the scaled restraint quantity and a pickup current threshold.
摘要翻译： 负序差分元件可以通过计算从第一相电流测量导出的负序值与第二相电流测量之间的差分来检测电力系统中的故障。 变压器可以设置在第一相电流和第二相电流测量位置之间。 可以对第一相电流测量和第二相电流测量进行归一化，并且可以从其计算负序电流。 负序电流可以用于计算操作量，其可以是第一和第二负序电流的和的绝对值，以及包括第一和第二负序电流的最大值的约束量。 约束量可以通过斜率因子来缩放。 如果操作量超过标定的限制量和拾取电流阈值，则可能会检测到故障。
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2.发明申请System and method to zero-sequence verify ground return path integrity by comparing measured zero-sequence current in an autotransformer with a second zero-sequence current source 有权通过将自耦变压器中的测量零序电流与第二零序电流源进行比较来对零序校验地回路径完整性的系统和方法公开(公告)号：US20080088466A1
公开(公告)日：2008-04-17
申请号：US11582254
申请日：2006-10-16
IPC分类号： G08B21/00
CPC分类号： G01R27/18 , G01R31/026 , H01F30/02 , H01F30/12
摘要： A ground return path is determined to be impaired when no zero-sequence current is measured in the neutral return path, but zero-sequence current is detected in other suitable measuring points that include the windings of an autotransformer, or in a magnetically coupled delta-configured tertiary winding, or potential transformer.
摘要翻译： 当在中性返回路径中没有测量零序电流时，确定接地返回路径受损，但是在包括自耦变压器的绕组的其他合适的测量点中检测到零序电流，或者在磁耦合的delta- 配置三级绕组或电位变压器。
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3.发明授权System and method to zero-sequence verify ground return path integrity by comparing measured zero-sequence current in an autotransformer with a second zero-sequence current source 有权通过将自耦变压器中的测量零序电流与第二零序电流源进行比较来对零序校验地回路径完整性的系统和方法公开(公告)号：US07940054B2
公开(公告)日：2011-05-10
申请号：US11582254
申请日：2006-10-16
IPC分类号： G01R31/14
CPC分类号： G01R27/18 , G01R31/026 , H01F30/02 , H01F30/12
摘要： A ground return path is determined to be impaired when no zero-sequence current is measured in the neutral return path, but zero-sequence current is detected in other suitable measuring points that include the windings of an autotransformer, or in a magnetically coupled delta-configured tertiary winding, or potential transformer.
摘要翻译： 当在中性返回路径中没有测量零序电流时，确定接地返回路径受损，但是在包括自耦变压器的绕组的其他合适的测量点中检测到零序电流，或者在磁耦合的delta- 配置三级绕组或电位变压器。
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公开(公告)号：US08321162B2
公开(公告)日：2012-11-27
申请号：US12695778
申请日：2010-01-28
IPC分类号： G06F19/00
CPC分类号： H02J3/1878 , G01R19/2513 , H02J3/46 , H02P13/06 , Y02E40/30 , Y02E60/728 , Y04S10/265
摘要： A power system may comprise two or more transformers operating in parallel. A voltage differential may exist between the transformers, which may create a circulating current in the power system. The system voltage of the power system may be modified by performing a tap change operation on one or more of the transformers. The tap change operation may be configured to minimize the circulating current. The circulating current may be minimized by determining the bias between the transformers using an angular difference between the transformer currents. The angular difference may be calculated using time-aligned measurement data. A tap change operation configured to modify the system voltage, while minimizing circulating current, may be determined using the transformer bias.
摘要翻译： 电力系统可以包括并联操作的两个或更多个变压器。 在变压器之间可能存在电压差，这可能在电力系统中产生循环电流。 可以通过对一个或多个变压器执行抽头变换操作来修改电力系统的系统电压。 抽头变换操作可以被配置为使循环电流最小化。 可以通过使用变压器电流之间的角度差确定变压器之间的偏压来最小化循环电流。 可以使用时间对准的测量数据来计算角度差。 可以使用变压器偏压来确定在最小化循环电流的同时修改系统电压的抽头变换操作。
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公开(公告)号：US07903381B2
公开(公告)日：2011-03-08
申请号：US12046250
申请日：2008-03-11
IPC分类号： H02H3/00
摘要： A negative sequence differential element may detect a fault in an electrical power system by computing a differential between negative sequence values derived from a first phase-current measurement and a second phase-current measurement. A transformer may be disposed between the first phase-current and second phase-current measurement location. The first phase-current measurement and the second phase-current measurement may be normalized and a negative sequence current may be calculated therefrom. The negative sequence currents may be used to calculate an operating quantity, which may be an absolute value of the sum of the first and second negative sequence currents, and a restraint quantity comprising a maximum of the first and second negative sequence currents. The restraint quantity may be scaled by a slope factor. A fault may be detected if the operating quantity exceeds the scaled restraint quantity and a pickup current threshold.
摘要翻译： 负序差分元件可以通过计算从第一相电流测量导出的负序值与第二相电流测量之间的差分来检测电力系统中的故障。 变压器可以设置在第一相电流和第二相电流测量位置之间。 可以对第一相电流测量和第二相电流测量进行归一化，并且可以从其计算负序电流。 负序电流可以用于计算操作量，其可以是第一和第二负序电流的和的绝对值，以及包括第一和第二负序电流的最大值的约束量。 约束量可以通过斜率因子来缩放。 如果操作量超过标定的限制量和拾取电流阈值，则可能会检测到故障。
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公开(公告)号：US20100125373A1
公开(公告)日：2010-05-20
申请号：US12695778
申请日：2010-01-28
CPC分类号： H02J3/1878 , G01R19/2513 , H02J3/46 , H02P13/06 , Y02E40/30 , Y02E60/728 , Y04S10/265
摘要： A power system may comprise two or more transformers operating in parallel. A voltage differential may exist between the transformers, which may create a circulating current in the power system. The system voltage of the power system may be modified by performing a tap change operation on one or more of the transformers. The tap change operation may be configured to minimize the circulating current. The circulating current may be minimized by determining the bias between the transformers using an angular difference between the transformer currents. The angular difference may be calculated using time-aligned measurement data. A tap change operation configured to modify the system voltage, while minimizing circulating current, may be determined using the transformer bias.
摘要翻译： 电力系统可以包括并联操作的两个或更多个变压器。 在变压器之间可能存在电压差，这可能在电力系统中产生循环电流。 可以通过对一个或多个变压器执行抽头变换操作来修改电力系统的系统电压。 抽头变换操作可以被配置为使循环电流最小化。 可以通过使用变压器电流之间的角度差确定变压器之间的偏压来最小化循环电流。 可以使用时间对准的测量数据来计算角度差。 可以使用变压器偏压来确定在最小化循环电流的同时修改系统电压的抽头变换操作。
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公开(公告)号：US09007731B2
公开(公告)日：2015-04-14
申请号：US13430391
申请日：2012-03-26
CPC分类号： H02H3/05 , G01R19/2513 , H02H3/26
摘要： Disclosed herein are systems and methods for leveraging the inherent redundancy of electrical measurement inputs available to microprocessor-based intelligent electronic devices (IEDs). Specifically, an IED may receive a plurality of electrical measurements associated with an electric power delivery system, such as measurements associated with a generator. A first protection module may be configured to detect a first type of electrical disturbance using a first subset of the plurality of electrical measurements. A second protection module may be configured to detect a second type of electrical disturbance using a second subset of the plurality of electrical measurements. A first redundant protection module may be configured to verify the detection of the first type of electrical disturbance using at least a portion of the second subset of the plurality of electrical measurements.
摘要翻译： 本文公开了用于利用可用于基于微处理器的智能电子设备（IED）的电测量输入的固有冗余的系统和方法。 具体地，IED可以接收与电力输送系统相关联的多个电测量，例如与发电机相关联的测量。 第一保护模块可以被配置为使用多个电测量的第一子集来检测第一类型的电扰动。 第二保护模块可以被配置为使用多个电测量的第二子集来检测第二类型的电扰动。 第一冗余保护模块可以被配置为使用多个电测量的第二子集的至少一部分来验证第一类型的电扰动的检测。
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公开(公告)号：US08553379B2
公开(公告)日：2013-10-08
申请号：US12561962
申请日：2009-09-17
CPC分类号： H02H7/045
摘要： Transformer differential protection is provided by measuring a plurality of currents corresponding to a first set of windings and a second set of windings of a transformer, and compensating the currents based on their respective flows through either the first set of windings or the second set of windings. The compensated currents may be intentionally augmented to compensate for magnetizing inrush and/or stationary overexcitation conditions associated with the transformer. Augmentation based on stationary overexcitation, for example, may be based on either harmonic restraint or an addition of a V/Hz ratio to a restraining signal. A complex current ratio is calculated corresponding to the plurality of compensated currents. The complex current ratio may be based on a two-terminal equivalent power apparatus. Then, an alpha plane analysis is applied to the complex current ratio. Based on the alpha plane analysis, a power apparatus that includes the transformer is selectively tripped.
摘要翻译： 通过测量对应于变压器的第一组绕组和第二组绕组的多个电流来提供变压器差动保护，并且基于通过第一组绕组或第二组绕组的相应流量来补偿电流 。 可以有意地增加补偿电流以补偿与变压器相关联的磁化浪涌和/或稳定的过激励条件。 例如，基于静止过激励的增强可以基于谐波抑制或者与限制信号相加的V / Hz比。 对应于多个补偿电流计算复电流比。 复电流比可以基于两端等效电力装置。 然后，将α平面分析应用于复电流比。 基于α平面分析，包括变压器的电力设备被选择性跳闸。
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公开(公告)号：US20130250458A1
公开(公告)日：2013-09-26
申请号：US13430391
申请日：2012-03-26
CPC分类号： H02H3/05 , G01R19/2513 , H02H3/26
摘要： Disclosed herein are systems and methods for leveraging the inherent redundancy of electrical measurement inputs available to microprocessor-based intelligent electronic devices (IEDs). Specifically, an IED may receive a plurality of electrical measurements associated with an electric power delivery system, such as measurements associated with a generator. A first protection module may be configured to detect a first type of electrical disturbance using a first subset of the plurality of electrical measurements. A second protection module may be configured to detect a second type of electrical disturbance using a second subset of the plurality of electrical measurements. A first redundant protection module may be configured to verify the detection of the first type of electrical disturbance using at least a portion of the second subset of the plurality of electrical measurements.
摘要翻译： 本文公开了用于利用可用于基于微处理器的智能电子设备（IED）的电测量输入的固有冗余的系统和方法。 具体地，IED可以接收与电力输送系统相关联的多个电测量，例如与发电机相关联的测量。 第一保护模块可以被配置为使用多个电测量的第一子集来检测第一类型的电扰动。 第二保护模块可以被配置为使用多个电测量的第二子集来检测第二类型的电扰动。 第一冗余保护模块可以被配置为使用多个电测量的第二子集的至少一部分来验证第一类型的电扰动的检测。
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公开(公告)号：US08275485B2
公开(公告)日：2012-09-25
申请号：US12854072
申请日：2010-08-10
申请人： Edmund O. Schweitzer, III , David E. Whitehead , Gregary C. Zweigle , Normann Fischer , Robert E. Morris
发明人： Edmund O. Schweitzer, III , David E. Whitehead , Gregary C. Zweigle , Normann Fischer , Robert E. Morris
IPC分类号： G06F19/00
CPC分类号： H02J3/16 , H02J3/06 , H02J3/1821 , H02J13/0062 , Y02E40/34 , Y02E40/74 , Y02E60/724 , Y02E60/726 , Y02E60/7838 , Y04S10/18 , Y04S10/22 , Y04S10/24 , Y04S40/124 , Y10T307/469
摘要： A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.
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