公开(公告)号：US08810976B2

公开(公告)日：2014-08-19

申请号：US13806752

申请日：2011-01-30

申请人： Liang Cao ,  Hao He ,  Jianyang Yu ,  Jiaohong Luo ,  Zhen Xu

发明人： Liang Cao ,  Hao He ,  Jianyang Yu ,  Jiaohong Luo ,  Zhen Xu

IPC分类号： H02H3/08 ,  H02H7/16

CPC分类号： H02H3/08 ,  H02H7/16

摘要： A harmonic protection method for a capacitor bank uses a harmonic protection apparatus, which includes a CPU unit, a current and voltage sampling unit, and a protection device. The CPU unit obtains effective value I1 of fundamental wave current of the capacitor bank, and effective value In of the n-th harmonic wave current of the capacitor bank, where n is harmonic order and ranges from 2 to ∞, and calculates the true effective value I of current of the capacitor bank by I = I 1 2 + ∑ n = 2 ∞ ⁢ k n ⁢ I n 2 provided that kn=rn/r1, kn is the n-th harmonic coefficient, rn is power consumption equivalent resistance of the capacitor bank for the n-th harmonic, r1 is power consumption equivalent resistance of the capacitor bank at a fundamental frequency. When I≧1.3 IN, the CPU unit controls the protecting device to disconnect the capacitor bank, provided that IN is a threshold current of the capacitor bank.

摘要翻译： 用于电容器组的谐波保护方法使用包括CPU单元，电流和电压采样单元以及保护装置的谐波保护装置。 CPU单元获得电容器组的基波电流的有效值I1，电容器组的n次谐波电流的有效值In，其中n为谐波次数，范围为2至∞，并计算真实有效值 电容器组电流I的值I = I 1 2 +Σn = 2∞⁢⁢kn kn I n n provided provided of of of of of of，of of of of of of of of of of of of 用于n次谐波的电容器组r1是基波频率下电容器组的功耗等效电阻。 当I≧1.3 IN时，CPU单元控制保护装置断开电容器组，前提是IN为电容器组的阈值电流。

公开(公告)号：US20130107399A1

公开(公告)日：2013-05-02

申请号：US13806752

申请日：2011-01-30

申请人： Liang Cao ,  Hao He ,  Jianyang Yu ,  Jiaohong Luo ,  Zhen Xu

发明人： Liang Cao ,  Hao He ,  Jianyang Yu ,  Jiaohong Luo ,  Zhen Xu

IPC分类号： H02H3/08

CPC分类号： H02H3/08 ,  H02H7/16

摘要： A harmonic protection method for a capacitor bank uses a harmonic protection apparatus, which includes a CPU unit, a current and voltage sampling unit, and a protection device. The CPU unit obtains effective value I1 of fundamental wave current of the capacitor bank, and effective value In of the n-th harmonic wave current of the capacitor bank, where n is harmonic order and ranges from 2 to ∞, and calculates the true effective value I of current of the capacitor bank by I = I 1 2 + ∑ n = 2 ∞  k n  I n 2 provided that kn=rn/r1, kn is the n-th harmonic coefficient , rn is power consumption equivalent resistance of the capacitor bank for the n-th harmonic, r1 is power consumption equivalent resistance of the capacitor bank at a fundamental frequency. When I≧1.3 IN, the CPU unit controls the protecting device to disconnect the capacitor bank, provided that IN is a threshold current of the capacitor bank.

摘要翻译： 用于电容器组的谐波保护方法使用包括CPU单元，电流和电压采样单元以及保护装置的谐波保护装置。 CPU单元获得电容器组的基波电流的有效值I1，电容器组的n次谐波电流的有效值In，其中n为谐波次数，范围为2至∞，并计算真实有效值 电容器组电流I的值I = I 1 2 +Σn = 2∞kn kn kn n that that that provided provided，，，，，，，，，，，，，，of of of of of 用于n次谐波的电容器组r1是基波频率下电容器组的功耗等效电阻。 当I> = 1.3 IN时，如果IN是电容器组的阈值电流，则CPU单元控制保护装置断开电容器组。