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    • 7. 发明授权
    • Differential current fault protection for an AC/DC hybrid system and
method therefor
    • AC / DC混合系统的差动电流故障保护及其方法
    • US5523938A
    • 1996-06-04
    • US485407
    • 1995-06-07
    • Carl WagnerHassan MansirKurt Duesterhoeft
    • Carl WagnerHassan MansirKurt Duesterhoeft
    • H02H3/28H02H7/125H02H3/18
    • H02H7/1255H02H3/28
    • A system of protection for an AC/DC hybrid electric power generation and distribution system having an AC portion comprising at least one source of AC power producing AC current coupled by first power feeders to a DC portion comprising at least one AC to DC converter producing DC current, the DC current being coupled by second power feeders to utilization equipment, comprises AC current sensors producing current sense signals proportional in magnitude to the AC current and DC current sensors producing current sense signals proportional in magnitude to the DC current. The AC current sensors define an entrance to a zone of protection, and the DC current sensors define an exit from the zone of protection. The AC and DC current sense signals are relationally compared to detect the presence of a differential current fault within the zone of protection. The protection system further discriminates the location of the fault between the AC portion and the DC portion of the hybrid power system by monitoring the ripple content in the sensed AC current. The relationship function utilized varies with the type of AC to DC conversion equipment to compensate for the power loss and transformer step up or down ratio (if used) to ensure tracking of the current level between AC current and DC output current. In addition to differential current fault protection, the instant invention detects shorted and open rectifiers, phases, and sensors.
    • 一种用于具有AC部分的AC / DC混合发电和配电系统的保护系统,所述AC部分包括至少一个AC功率源,其产生由第一馈电线耦合到DC部分的AC电流,所述DC部分包括至少一个AC至DC转换器,DC转换器产生DC 电流,由第二馈电器耦合到利用设备的直流电流包括交流电流传感器,其产生与AC电流和DC电流传感器成正比的电流检测信号,产生与DC电流大小成正比的电流检测信号。 交流电流传感器定义了保护区的入口,直流电流传感器定义了保护区的出口。 交流和直流电流检测信号被相互比较,以检测保护区内的差动电流故障的存在。 该保护系统通过监视感测的交流电流中的纹波含量来进一步鉴别混合动力系统的交流部分和直流部分之间的故障位置。 所使用的关系函数随着AC到DC转换设备的类型而变化,以补偿功率损耗和变压器升压比(如果使用),以确保跟踪交流电流和直流输出电流之间的电流水平。 除了差动电流故障保护之外,本发明还检测短路和开路整流器,相位和传感器。
    • 10. 发明授权
    • Rotor for a dynamoelectric machine
    • 转子用于电动机
    • US6091168A
    • 2000-07-18
    • US218653
    • 1998-12-22
    • David G. HalseyHassan MansirRobert GrennanWilliam J. GreenleeDam Nguyen
    • David G. HalseyHassan MansirRobert GrennanWilliam J. GreenleeDam Nguyen
    • H02K1/24H02K1/32H02K9/02H02K9/00
    • H02K1/32H02K1/24H02K9/02
    • Losses in efficiency of operation of a dynamoelectric machine as a result of eddy current losses and poor coolant efficiency and/or disruption of the magnetic circuit in a rotor by coolant passages is avoided in a dynamoelectric machine including a stator (18) in which a rotor (16) is journaled. The rotor includes a stack (16) of thin laminations (17) made of a ferromagnetic material to define a rotor body. The rotor body includes a plurality of equally angularly spaced poles (58) separated by recesses (64). Coolant passages (76) located in the rotor at or just radially inward of the base (72) of each pole (58) and substantially radially outward of the rotational axis (56) of the rotor (14) to maximize cooling efficiency of the poles (58) without disrupting the magnetic circuit in the rotor. Slots (80) are placed in the tips (70) of the poles (58) of selected laminations (17) and extend generally radially inward to reduce eddy current losses.
    • 在包括定子(18)的电动机中避免了由于涡流损失和冷却剂效率差和/或由冷却剂通道引起的转子中的磁路的破坏导致的电动机的操作效率的损失,其中转子 (16)记录。 转子包括由铁磁材料制成的薄的叠片(17)的叠层(16),以形成转子体。 转子主体包括由凹部(64)分开的多个等角度间隔的极(58)。 冷却剂通道(76)位于转子的每一极(58)的基部(72)处或位于转子的径向内侧,并且基本上位于转子(14)的旋转轴线(56)的径向外侧,以使极点的冷却效率最大化 (58),而不破坏转子中的磁路。 狭槽(80)被放置在所选择的叠片(17)的极(58)的尖端(70)中,并且大致径向向内延伸以减少涡流损耗。