公开(公告)号：US06794879B2

公开(公告)日：2004-09-21

申请号：US09986467

申请日：2001-11-08

申请人： Rodney Allen Lawson ,  William Robert Pearson ,  Harold Copeland Sanderson ,  Mohammed Kassem Saleh ,  Gautam Sinha ,  Ivan Elmo Freeman, Jr. ,  Bruce Allen Gerritsen

发明人： Rodney Allen Lawson ,  William Robert Pearson ,  Harold Copeland Sanderson ,  Mohammed Kassem Saleh ,  Gautam Sinha ,  Ivan Elmo Freeman, Jr. ,  Bruce Allen Gerritsen

IPC分类号： G01R3102

CPC分类号： G01R27/18 ,  G01R31/025 ,  G01R31/083

摘要： The field ground fault detector of the present invention detects a ground fault that occurs in the field circuit and in any associated circuits galvanically connected to the field. The field ground fault detector discerns the ground resistance so that it can be monitored to detect gradual degradation of the ground resistance. The detector estimates the resistance of the ground fault and the location of the ground fault. The detector is able to estimate the location of the ground fault during system operation and during periods of non-operation. The invention utilizes a low frequency square wave oscillator to permit measurement of the ground fault resistance when field voltage is not applied, to insure that there are no blind spots when the field is energized, and to provide a method for estimating the ground fault resistance. The field ground detector can differentiate between ground faults that occur on the AC side form those on the DC side of the Thyristor Bridge.

摘要翻译： 本发明的现场接地故障检测器检测在现场电路和电流连接到场的任何相关电路中发生的接地故障。 现场接地故障检测器识别接地电阻，从而可以对其进行监控，以检测接地电阻的逐渐劣化。 检测器估计接地故障的电阻和接地故障的位置。 检测器能够估计系统运行期间和非运行期间接地故障的位置。 本发明利用低频方波振荡器来允许在不施加场电压时测量接地故障电阻，以确保当场通电时不存在盲点，并且提供用于估计接地故障电阻的方法。 现场接地检测器可以区分交流侧出现的接地故障，与晶闸管桥接直流侧的接地故障区分开。

公开(公告)号：US07345457B2

公开(公告)日：2008-03-18

申请号：US11326978

申请日：2006-01-06

申请人： Luis Jose Garces ,  Robert William Delmerico ,  Patrick Lee Jansen ,  John Harold Parslow ,  Harold Copeland Sanderson ,  Gautam Sinha

发明人： Luis Jose Garces ,  Robert William Delmerico ,  Patrick Lee Jansen ,  John Harold Parslow ,  Harold Copeland Sanderson ,  Gautam Sinha

IPC分类号： H02P9/14

CPC分类号： H02P9/302

摘要： A brushless exciter for a synchronous generator or motor generally includes a stator and a rotor rotatably disposed within the stator. The rotor has a field winding and a voltage rectifying bridge circuit connected in parallel to the field winding. A plurality of firing circuits are connected the voltage rectifying bridge circuit. The firing circuit is configured to fire a signal at an angle of less than 90° or at an angle greater than 90°. The voltage rectifying bridge circuit rectifies the AC voltage to excite or de-excite the field winding.

摘要翻译： 用于同步发电机或电动机的无刷励磁器通常包括定子和可旋转地设置在定子内的转子。 转子具有与励磁绕组并联连接的励磁绕组和电压整流桥式电路。 多个点火电路连接在整流桥电路上。 点火电路被配置为以小于90°的角度或大于90°的角度点燃信号。 电压整流桥电路对交流电压进行整流，激励或去激励励磁绕组。