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1.发明授权Apparatus and method for identifying a faulted phase in a shunt capacitor bank 有权用于识别并联电容器组中的故障相位的装置和方法公开(公告)号：US08575941B2
公开(公告)日：2013-11-05
申请号：US12555189
申请日：2009-09-08
IPC分类号： G01R31/08
摘要： An apparatus and method is provided for identifying a faulted phase in at least one shunt capacitor bank. The apparatus generally includes a sampling circuit for sampling current or voltage signals associated with the shunt capacitor bank. A microcontroller is coupled to the sampling circuit and programmed to measure a compensated neutral point phase angle from the sampled signal, and compare the compensated neutral point phase angle with a fixed reference phase angle to identify the faulted phase of the shunt capacitor bank. The method generally includes the steps of sampling a current or voltage signal associated with the shunt capacitor bank, determining a compensated neutral point phase angle from the sampled signal, and comparing the compensated neutral point phase angle with a fixed reference phase angle to identify the faulted phase of the shunt capacitor bank. The invention also relates to an apparatus and method for identifying the location of the fault (e.g., the section of the bank) in a double ungrounded shunt capacitor bank or double WYE shunt capacitor bank.
摘要翻译： 提供一种用于识别至少一个并联电容器组中的故障相位的装置和方法。 该装置通常包括用于对与分流电容器组相关联的电流或电压信号进行采样的采样电路。 微控制器耦合到采样电路并编程为从采样信号测量补偿的中性点相位角，并将补偿的中性点相位角与固定的参考相位角进行比较，以识别并联电容器组的故障相位。 该方法通常包括对与分流电容器组相关联的电流或电压信号进行采样的步骤，从采样信号确定补偿的中性点相位角，并将补偿的中性点相位角与固定的参考相位角进行比较，以识别故障的 分流电容器组的相位。 本发明还涉及一种用于在双未接地并联电容器组或双WYE并联电容器组中识别故障（例如，存储体的部分）的位置的装置和方法。
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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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3.发明申请APPARATUS AND METHOD FOR IDENTIFYING A FAULTED PHASE IN A SHUNT CAPACITOR BANK 有权用于识别交换电容器中的故障相的装置和方法公开(公告)号：US20110057661A1
公开(公告)日：2011-03-10
申请号：US12555189
申请日：2009-09-08
IPC分类号： G01R31/08
摘要： An apparatus and method is provided for identifying a faulted phase in at least one shunt capacitor bank. The apparatus generally includes a sampling circuit for sampling current or voltage signals associated with the shunt capacitor bank. A microcontroller is coupled to the sampling circuit and programmed to measure a compensated neutral point phase angle from the sampled signal, and compare the compensated neutral point phase angle with a fixed reference phase angle to identify the faulted phase of the shunt capacitor bank. The method generally includes the steps of sampling a current or voltage signal associated with the shunt capacitor bank, determining a compensated neutral point phase angle from the sampled signal, and comparing the compensated neutral point phase angle with a fixed reference phase angle to identify the faulted phase of the shunt capacitor bank. The invention also relates to an apparatus and method for identifying the location of the fault (e.g., the section of the bank) in a double ungrounded shunt capacitor bank or double WYE shunt capacitor bank.
摘要翻译： 提供一种用于识别至少一个并联电容器组中的故障相位的装置和方法。 该装置通常包括用于对与分流电容器组相关联的电流或电压信号进行采样的采样电路。 微控制器耦合到采样电路并编程为从采样信号测量补偿的中性点相位角，并将补偿的中性点相位角与固定的参考相位角进行比较，以识别并联电容器组的故障相位。 该方法通常包括对与分流电容器组相关联的电流或电压信号进行采样的步骤，从采样信号确定补偿的中性点相位角，并将补偿的中性点相位角与固定的参考相位角进行比较，以识别故障的 分流电容器组的相位。 本发明还涉及一种用于在双未接地并联电容器组或双WYE并联电容器组中识别故障（例如，存储体的部分）的位置的装置和方法。
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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：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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6.发明授权公开(公告)号：US07504806B2
公开(公告)日：2009-03-17
申请号：US11368826
申请日：2006-03-06
CPC分类号： G05F1/12 , G05F1/14 , H02J3/1878 , Y02E40/30 , Y10T307/538
摘要： Provided are methods for controlling operation of a voltage regulator of a single-phase of a three-phase power system to regulate a measured voltage. One of the methods includes recording a first elapsed time between detecting a first excursion of the measured voltage from an in-band area to an out-of-band area, and a first return of the measured voltage to the in-band area. The method also includes recording a second elapsed time period (dip period) between detecting the first return and a second excursion of the measured voltage from the in-band area to an out-of-band area. If the second elapsed time period is less than a predetermined dip time period, causing a tap position change of the voltage regulator upon expiration of a countdown period initiated upon detecting the first excursion, thereby adjusting the measured voltage to the in-band area while allowing a voltage drop of limited length.
摘要翻译： 提供了用于控制三相电力系统的单相的电压调节器的操作以调节测量的电压的方法。 其中一种方法包括：在从带内区域检测到测量的电压的第一偏移到带外区域之间记录第一经过时间，以及将测量的电压首次返回到带内区域。 该方法还包括在从带内区域到带外区域之间检测第一次返回和测量电压的第二偏移之间记录第二经过时间段（dip period）。 如果第二经过时间段小于预定的浸渍时间段，则在检测到第一偏移时启动的倒数计时期限结束时导致电压调节器的抽头位置变化，从而将测量的电压调整到带内区域，同时允许 一个有限长度的电压降。
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公开(公告)号：US07271572B2
公开(公告)日：2007-09-18
申请号：US11368827
申请日：2006-03-06
摘要： Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area. The method includes determining a measured voltage and current at the voltage regulator, determining a line voltage drop between the voltage regulator and the load if the measured voltage in the OOB area above the in-band area, and utilizing the measured voltage to lower the voltage at the load if there are no available taps. The method also includes utilizing the measured voltage less the line voltage drop to determine the tap change if there are available taps.
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8.发明授权公开(公告)号：US07759913B2
公开(公告)日：2010-07-20
申请号：US12350429
申请日：2009-01-08
CPC分类号： G05F1/12 , G05F1/14 , H02J3/1878 , Y02E40/30 , Y10T307/538
摘要： Provided are methods for controlling operation of a voltage regulator of a single-phase of a three-phase power system to regulate a measured voltage. One of the methods includes recording a first elapsed time between detecting a first excursion of the measured voltage from an in-band area to an out-of-band area, and a first return of the measured voltage to the in-band area. The method also includes recording a second elapsed time period (dip period) between detecting the first return and a second excursion of the measured voltage from the in-band area to an out-of-band area. If the second elapsed time period is less than a predetermined dip time period, causing a tap position change of the voltage regulator upon expiration of a countdown period initiated upon detecting the first excursion, thereby adjusting the measured voltage to the in-band area while allowing a voltage drop of limited length.
摘要翻译： 提供了用于控制三相电力系统的单相的电压调节器的操作以调节测量的电压的方法。 其中一种方法包括：在从带内区域检测到测量的电压的第一偏移到带外区域之间记录第一经过时间，以及将测量的电压首次返回到带内区域。 该方法还包括在从带内区域到带外区域之间检测第一次返回和测量电压的第二偏移之间记录第二经过时间段（dip period）。 如果第二经过时间段小于预定的浸渍时间段，则在检测到第一偏移时启动的倒数计时期限结束时导致电压调节器的抽头位置变化，从而将测量的电压调整到带内区域，同时允许 一个有限长度的电压降。
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9.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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10.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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