Load compensation in distance protection of a three-phase power transmission line
    1.
    发明授权
    Load compensation in distance protection of a three-phase power transmission line 有权
    负载补偿在三相输电线路的距离保护

    公开(公告)号:US08159229B2

    公开(公告)日:2012-04-17

    申请号:US12293601

    申请日:2006-10-18

    IPC分类号: G01R31/08 H02H3/00

    CPC分类号: H02H3/402 G01R31/088

    摘要: A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach.

    摘要翻译: 一种用于距离保护的相对地环路的负载补偿方法。 假设零故障电阻或正序列电流估计第一反应到达。 以零序电流估计第二反应到达。 用负序电流估计第三个反应到达。 估计进出口条件。 根据第一,第二和第三无效范围估计进出口条件的第四个反应性达到。 基于估计的第四无功覆盖率来估计故障阻抗。

    LOAD COMPENSATION IN DISTANCE PROTECTION OF A THREE-PHASE POWER TRANSMISSION LINE
    2.
    发明申请
    LOAD COMPENSATION IN DISTANCE PROTECTION OF A THREE-PHASE POWER TRANSMISSION LINE 有权
    三相输电线路距离保护的负载补偿

    公开(公告)号:US20100225329A1

    公开(公告)日:2010-09-09

    申请号:US12293601

    申请日:2006-10-18

    IPC分类号: G01R31/08

    CPC分类号: H02H3/402 G01R31/088

    摘要: A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach.

    摘要翻译: 一种用于距离保护的相对地环路的负载补偿方法。 假设零故障电阻或正序列电流估计第一反应到达。 以零序电流估计第二反应到达。 用负序电流估计第三个反应到达。 估计进出口条件。 根据第一,第二和第三无效范围估计进出口条件的第四个反应性达到。 基于估计的第四无功覆盖率来估计故障阻抗。

    Phasor Estimation During Current Transformer Saturation
    3.
    发明申请
    Phasor Estimation During Current Transformer Saturation 有权
    电流互感器饱和期间的相量估计

    公开(公告)号:US20110025303A1

    公开(公告)日:2011-02-03

    申请号:US12892607

    申请日:2010-09-28

    IPC分类号: G01R15/18 G01R19/00

    CPC分类号: G01R15/183 H02H1/046

    摘要: A method, device and computer program product for determining at least one property of a current (Ip) running through the primary winding of a transformer operating in saturation using an unreliable detected current (Is) running through the secondary winding of the transformer. According to the invention a first reliable extreme point (EP1) of a cycle of the current in the secondary winding is detected and compared with an absolute time reference. Based on the comparison a first property of the current running through the primary winding in the form of the phase angle is then determined.

    摘要翻译: 一种方法,装置和计算机程序产品,用于使用运行在变压器的次级绕组上的不可靠的检测电流(Is)来确定运行在饱和状态下的变压器的初级绕组的电流(Ip)的至少一个性质。 根据本发明,检测次级绕组中的电流的循环的第一可靠极限点(EP1),并将其与绝对时间基准进行比较。 基于比较,然后确定以相位角形式穿过初级绕组的电流的第一特性。

    Fault direction determination
    4.
    发明授权
    Fault direction determination 有权
    故障方向确定

    公开(公告)号:US07948241B2

    公开(公告)日:2011-05-24

    申请号:US12814572

    申请日:2010-06-14

    IPC分类号: G01R31/08

    CPC分类号: H02H3/382

    摘要: The invention concerns a method and computer program product for determining the direction of fault in an electrical power system as well as to a fault handling device. In the fault handling device the voltage at a measurement node of the power system is measured, the phase (φPF) of this voltage (VPF) before a fault is stored, the phase (φF) of this voltage (VF) at the end of a time interval (TI) following directly after a detected fault is determined, a phase offset (φO) is determined as the difference between the phase (φPF) of the measured voltage (VPF) before the fault and the phase (φF) of the measured voltage (VF) at the end of the time interval (TI) and the phase (φF) of the measured voltage (VF) after the detection of the fault is adjusted with the phase offset (φO). Thereafter the adjusted measured voltage is used in determining the direction of fault in relation to the measurement node.

    摘要翻译: 本发明涉及用于确定电力系统以及故障处理装置中的故障方向的方法和计算机程序产品。 在故障处理装置中,测量电力系统测量节点处的电压,存储故障前的该电压(VPF)的相位(&phgr。PF),该电压(VF)的相位(F) 在确定检测到的故障之后的时间间隔(TI)结束时,相位偏移(&phgr; O)被确定为故障之前的测量电压(VPF)的相位(&phgr; PF)之间的差值 在时间间隔(TI)结束时的测量电压(VF)和检测到故障后的测量电压(VF)的相位(&Phgr。F)的相位(&Phgr。F) 相位偏移(&phgr; O)。 此后,调整后的测量电压用于确定相对于测量节点的故障方向。

    Fault Direction Determination
    5.
    发明申请
    Fault Direction Determination 有权
    故障方向确定

    公开(公告)号:US20100244851A1

    公开(公告)日:2010-09-30

    申请号:US12814572

    申请日:2010-06-14

    IPC分类号: G01R31/08

    CPC分类号: H02H3/382

    摘要: The invention concerns a method and computer program product for determining the direction of fault in an electrical power system as well as to a fault handling device. In the fault handling device the voltage at a measurement node of the power system is measured, the phase (φPF) of this voltage (VPF) before a fault is stored, the phase (φF) of this voltage (VF) at the end of a time interval (TI) following directly after a detected fault is determined, a phase offset (φO) is determined as the difference between the phase (φPF) of the measured voltage (VPF) before the fault and the phase (φF) of the measured voltage (VF) at the end of the time interval (TI) and the phase (φF) of the measured voltage (VF) after the detection of the fault is adjusted with the phase offset (φO). Thereafter the adjusted measured voltage is used in determining the direction of fault in relation to the measurement node.

    摘要翻译: 本发明涉及用于确定电力系统以及故障处理装置中的故障方向的方法和计算机程序产品。 在故障处理装置中,测量电力系统测量节点处的电压,存储故障前的该电压(VPF)的相位(&phgr。PF),该电压(VF)的相位(F) 在确定检测到的故障之后的时间间隔(TI)结束时,相位偏移(&phgr; O)被确定为故障之前的测量电压(VPF)的相位(&phgr; PF)之间的差值 在时间间隔(TI)结束时的测量电压(VF)和检测到故障后的测量电压(VF)的相位(&Phgr。F)的相位(&Phgr。F) 相位偏移(&phgr; O)。 此后,调整后的测量电压用于确定相对于测量节点的故障方向。

    Phasor estimation during current transformer saturation
    6.
    发明授权
    Phasor estimation during current transformer saturation 有权
    电流互感器饱和期间的相量估计

    公开(公告)号:US08395373B2

    公开(公告)日:2013-03-12

    申请号:US12892607

    申请日:2010-09-28

    IPC分类号: G01R15/18

    CPC分类号: G01R15/183 H02H1/046

    摘要: A method, device and computer program product for determining at least one property of a current (Ip) running through the primary winding of a transformer operating in saturation using an unreliable detected current (Is) running through the secondary winding of the transformer. According to the invention a first reliable extreme point (EP1) of a cycle of the current in the secondary winding is detected and compared with an absolute time reference. Based on the comparison a first property of the current running through the primary winding in the form of the phase angle is then determined.

    摘要翻译: 一种方法,装置和计算机程序产品,用于使用运行在变压器的次级绕组上的不可靠的检测电流(Is)来确定运行在饱和状态下的变压器的初级绕组的电流(Ip)的至少一个性质。 根据本发明,检测次级绕组中的电流的循环的第一可靠极限点(EP1),并将其与绝对时间基准进行比较。 基于比较,然后确定以相位角形式穿过初级绕组的电流的第一特性。