公开(公告)号：US5561605A

公开(公告)日：1996-10-01

申请号：US438464

申请日：1995-05-10

Applicant: Joseph J. Zuercher ,  Charles J. Tennies

Inventor： Joseph J. Zuercher ,  Charles J. Tennies

IPC: G01R31/12 ,  G01R31/02 ,  G01R31/14 ,  H02H1/00 ,  H02H1/04 ,  H02H3/16 ,  H02H3/44 ,  G01R19/10

CPC classification number: G01R31/025 ,  H02H1/0015 ,  H02H3/44 ,  H02H1/04

Abstract: In an electric circuit supplying AC line current to a load (30, 31) from an AC source (26) of given frequency providing repetitive cycles, arc detection is provided by sensing cycle to cycle changes in the AC line current. The AC line current is sampled with a harmonic notch filter (72) at a plurality of n phases .THETA..sub.1 through .THETA..sub.n during each of a plurality of m cycles of the AC source (26), to provide a plurality of currents I.sub.n,m, where n is the phase and m is the cycle. The differences (I.sub.n,m)-(I.sub.n,m-x), where x is a designated number of cycles, provide a plurality of current difference signals. The absolute values of these current difference signals ID are accumulated in a synchronous summer (94) over the m cycles. An arc indicative signal is generated in response to given conditions and given combinations of conditions (116) of the cumulative absolute current difference signals ID. Cycle to cycle changes in AC line voltage are also sensed with a harmonic notch filter (146), and the arc indicative signal is disarmed in response to a given voltage condition. In further embodiments, subcycle changes are sensed.

Abstract translation: 在从提供重复周期的给定频率的AC源（26）向负载（30,31）提供AC线路电流的电路中，通过感测周期来循环改变AC线路电流来提供电弧检测。 在AC源（26）的多个m个周期的每一个期间，在多个n相THETA 1至THETA n处的谐波陷波滤波器（72）对AC线路电流进行采样，以提供多个电流In，m ，其中n是相位，m是周期。 差异（In，m） - （In，m-x），其中x是指定的周期数，提供多个电流差信号。 这些电流差信号ID的绝对值在m个周期的同步夏（94）中累加。 响应于给定条件和累积绝对电流差信号ID的条件（116）的给定组合，产生电弧指示信号。 还用谐波陷波滤波器（146）感测到交流线路电压的周期变化，并且响应于给定的电压条件来撤消电弧指示信号。 在另外的实施例中，感测到子周期变化。

公开(公告)号：US5452223A

公开(公告)日：1995-09-19

申请号：US110090

申请日：1993-08-20

Applicant: Joseph J. Zuercher ,  Charles J. Tennies

Inventor： Joseph J. Zuercher ,  Charles J. Tennies

IPC: G01R31/12 ,  G01R31/02 ,  G01R31/14 ,  H02H1/00 ,  H02H1/04 ,  H02H3/16 ,  H02H3/44 ,  G01R19/10

CPC classification number: G01R31/025 ,  H02H1/0015 ,  H02H3/44 ,  H02H1/04

Abstract: In an electric circuit supplying AC line current rent to a load (30, 31) from an AC source (26) of given frequency providing repetitive cycles, arc detection is provided by sensing cycle to cycle changes in the AC line current. The AC line current is sampled with a harmonic notch filter (72) at a plurality of n phases .THETA..sub.1 through .THETA..sub.n during each of a plurality of m cycles of the AC source (26), to provide a plurality of currents I.sub.n,m, where n is the phase and m is the cycle. The differences (I.sub.n,m)-(I.sub.n,m-x), where x is a designated number of cycles, provide a plurality of current difference signals. The absolute values of these current difference signals ID are accumulated in a synchronous summer (94) over the m cycles. An arc indicative signal is generated in response to given conditions and given combinations of conditions (116) of the cumulative absolute current difference signals ID. Cycle to cycle changes in AC line voltage are also sensed with a harmonic notch filter (146), and the arc indicative signal is disarmed in response to a given voltage condition. In further embodiments, subcycle changes are sensed.

Abstract translation: 在从提供重复周期的给定频率的AC源（26）向负载（30,31）提供AC线路电流租金的电路中，通过感测周期来循环改变AC线路电流来提供电弧检测。 在AC源（26）的多个m个周期的每一个期间，在多个n相THETA 1至THETA n处的谐波陷波滤波器（72）对AC线路电流进行采样，以提供多个电流In，m ，其中n是相位，m是周期。 差异（In，m） - （In，m-x），其中x是指定的周期数，提供多个电流差信号。 这些电流差信号ID的绝对值在m个周期的同步夏（94）中累加。 响应于给定条件和累积绝对电流差信号ID的条件（116）的给定组合，产生电弧指示信号。 还用谐波陷波滤波器（146）感测到交流线路电压的周期变化，并且响应于给定的电压条件来撤消电弧指示信号。 在另外的实施例中，感测到子周期变化。