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    • 4. 发明授权
    • Method of determining contact wear in a trip unit
    • 确定跳闸单元中接触磨损的方法
    • US06466023B2
    • 2002-10-15
    • US09778698
    • 2001-02-07
    • John J. DoughertyBo L. Andersen
    • John J. DoughertyBo L. Andersen
    • G01R3102
    • H01H1/0015H01H71/123H01H71/125H01H2011/0068
    • A method of determining contact wear in a trip unit of a circuit breaker and a circuit breaker employing such a method are presented. The trip unit includes a microcontroller and associated memories. An algorithm (program) stored in a memory of the trip unit calculates cumulative energy dissipated in the breaker contacts using the current signal detected at the time of separation. Measurement of cumulative energy dissipated in the breaker contacts is proportional to contact wear. Maintenance setpoints are determined based on industry standard endurance tests and alarm threshold and trip thresholds further based on industry standards are provided within the algorithm for notifying local or remote personnel of a necessary maintenance procedure.
    • 介绍了一种确定断路器跳闸单元和采用这种方法的断路器的接触磨损的方法。 跳闸单元包括微控制器和相关联的存储器。 存储在跳闸单元的存储器中的算法(程序)使用在分离时检测到的当前信号来计算在断路器触点中消耗的累积能量。 断路器触点中消耗的累积能量的测量与接触磨损成比例。 维护设定值是根据行业标准耐久性测试确定的,并且在算法内提供进一步基于行业标准的报警阈值和跳闸阈值,以通知本地或远程人员必要的维护程序。
    • 7. 发明授权
    • Pile joiner for connecting the ends of concrete piles and its members
    • 用于连接混凝土桩及其构件端部的桩连接器
    • US3988899A
    • 1976-11-02
    • US592189
    • 1975-07-01
    • John J. Dougherty
    • John J. Dougherty
    • E02D5/52E02D5/30B25G3/00
    • E02D5/523Y10T403/7088
    • A pile joiner is disclosed for connecting together the ends of concrete piles which joiner includes a socket member and a mating member one of which is on the end of one pile and the other is on the end of the pile to be connected therewith. Each of these two members has a base plate with a central hole therethrough and a tubular element secured to each base plate and extending at right angles thereto. One tubular element is a socket element and the other is a mating element which is received within the socket element. The socket element and the mating element have at least a first sleeve means which includes a sleeve hole or holes through a wall or walls of each element and in alignment when the members are assembled together, an outer sleeve for each sleeve hole of the socket element extending outwardly and an inner sleeve for the sleeve hole or holes of the mating element extending inwardly or between sleeve holes in opposite walls thereof. When the two members are assembled together with their base plates in contact, the first sleeve means of each member or element are in alignment and receive a lock bar to retain the two members and their piles together against separation. Preferably the tubular socket element and the tubular mating element have a second sleeve means similar to the first which are in alignment when the two members are assembled together and preferably angularly located with respect to the first sleeve means. A second lock bar is received therein to additionally secure the the two members and the ends of the piles together. The pile joiner is constructed so that it is suitable for piles of different forms in cross section and for a wide range of sizes of piles. The invention includes each member individually as well as the members in combination as a pile joiner.
    • 公开了一种用于将混凝土桩的端部连接在一起的桩接头,所述混凝土桩的端部包括插座构件和配合构件,其中一个位于一个桩的一端,另一个位于待连接的桩的端部上。 这两个构件中的每一个具有穿过其中心孔的基板和固定到每个基板并与其成直角延伸的管状元件。 一个管状元件是插座元件,另一个是接纳在插座元件内的配合元件。 插座元件和配合元件至少具有第一套筒装置,其包括穿过每个元件的壁或壁的套筒孔或孔,当构件组装在一起时对齐,用于插座元件的每个套筒孔的外套筒 向外延伸,并且用于套筒孔的内套筒或配合元件的孔向内或在其相对壁中的套筒孔之间延伸。 当两个构件与其基板接触地组装在一起时,每个构件或元件的第一套筒装置对准并且接收锁定杆,以将两个构件和它们的桩保持在一起而不会分离。 优选地,管状插座元件和管状配合元件具有类似于第一套筒装置的第二套筒装置,当第一套筒装置组装在一起并优选地相对于第一套筒装置成角度地定位时,第二套筒装置对齐。 第二锁杆被容纳在其中以另外将两个构件和桩的端部固定在一起。 堆垛机的构造使其适用于横截面不同形式的桩和各种尺寸的桩。 本发明独立地包括每个构件以及作为桩接头组合的构件。
    • 9. 发明授权
    • Arcing fault detection module
    • 电弧故障检测模块
    • US6002561A
    • 1999-12-14
    • US6796
    • 1998-01-14
    • John J. Dougherty
    • John J. Dougherty
    • H02H1/00H02H3/52H02H3/00
    • H02H1/0015H02H3/52
    • An arcing fault detection module (4) for detecting arcing faults in an electrical current distribution circuit (8) comprises a filter circuit (9) and an autocorrelation circuit (10). The filter circuit (9) is electrically connected to the distribution circuit (8) and samples current with the distribution circuit. The filter circuit (9) includes a band pass filter (12) to filter out fundamental and high frequency components from the sampled current, and a comparator (13) to convert the sampled current to a digital signal. The autocorrelation circuit (10) receives the digital signal from the filter circuit (9). The autocorrelation circuit (10) includes a plurality of shift registers (15-18) for storing the digital signal for a predetermined sample period, and a plurality of EXCLUSIVE-OR gates (35-37,41, 43, 44) and OR gates (38, 39) to detect odd and even harmonic signals. An integrator-counter (47) electrically connects to certain EXCLUSIVE-OR and OR gates, and provides an arc indicative signal when the absolute value of the even and odd harmonic signals is equal to a predetermined number.
    • 一种用于检测电流分配电路(8)中的电弧故障的电弧故障检测模块(4)包括滤波电路(9)和自相关电路(10)。 滤波器电路(9)与分配电路(8)电连接,并与分配电路进行采样。 滤波器电路(9)包括滤波器(12),用于从采样电流滤除基频和高频分量;以及比较器(13),用于将采样的电流转换成数字信号。 自相关电路(10)从滤波电路(9)接收数字信号。 自相关电路(10)包括用于存储预定采样周期的数字信号的多个移位寄存器(15-18)和多个异或门(35-37,41,43,44)和OR门 (38,39)来检测奇偶谐波信号。 积分器计数器(47)电连接到某些“异或”和“或”门,并且当奇偶谐波信号的绝对值等于预定数量时,提供电弧指示信号。