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    Harmonic and power factor compensation means and method for power systems controlled by a non-linear device
    2.
    发明授权
    Harmonic and power factor compensation means and method for power systems controlled by a non-linear device 失效
    谐波和功率因数补偿方法和非线性器件控制的电力系统的方法

    公开(公告)号：US3859542A

    公开(公告)日：1975-01-07

    申请号：US39662573

    申请日：1973-09-12

    Applicant: INDUCTOTHERM CORP

    Inventor： KENNEDY THEODORE R

    IPC: H02J3/18 ,  H03H7/01 ,  H03H7/02

    CPC classification number: H03H7/1758 ,  H02J3/1828 ,  H03H7/0115 ,  H03H7/1791 ,  Y02E40/30 ,  Y02P80/112

    Abstract: The fundamental frequency power factor is improved and a practical reduction in significant harmonic current is made in electrical power systems where the power to the load is controlled by a non-linear device, such as a saturable reactor, by using series inductive-capacitive filters to filter the significant harmonic current to act as a shunt for harmonic current in conjunction with a supply line inductive reactance. The resonant frequency of each filter is less than the frequency of the harmonic current and the impedance of each said inductivecapacitive filter is a net inductive reactance. The capacitive element of the filter provides a leading power factor component to compensate for the lagging power factor component imposed on the supply system by the non-linear control device.

    Abstract translation: 提高了基频功率因数，并且通过使用串联的电感 - 电容滤波器对诸如可饱和电抗器之类的非线性装置来控制负载功率的电力系统中实现了有效谐波电流的实际减少 过滤有效谐波电流，以便与供电线感抗一起作为谐波电流的分流。 每个滤波器的谐振频率小于谐波电流的频率，并且每个所述电感 - 电容滤波器的阻抗是净感抗。 滤波器的电容元件提供了一个领先的功率因数分量，以补偿由非线性控制装置施加在供电系统上的滞后功率因数分量。

    Method and means for detecting incipient capacitor failure
    4.
    发明授权
    Method and means for detecting incipient capacitor failure 失效
    检测机组电容器故障的方法和手段

    公开(公告)号：US3657602A

    公开(公告)日：1972-04-18

    申请号：US3657602D

    申请日：1971-04-05

    Applicant: INDUCTOTHERM CORP

    Inventor： BOEHM PAUL C ,  KENNEDY THEODORE R

    IPC: H02H7/16

    CPC classification number: H02H7/16

    Abstract: Incipient failure of a capacitor operating as a part of an induction furnace circuit is detected by monitoring the capacitor to determine the presence of high-frequency signals generated by the capacitor as its dielectric material deteriorates. The lower limit of the frequencies of such signals is in the range from 50 to 200 kHz. The sensing apparatus for a 3 kHz induction heating circuit includes detector means for converting the generated signals exceeding about 150 kHz into a control signal whose level exceeds a predetermined value when the generated signals are representative of incipient deterioration of the dielectric. Indicator means responsive to the control signal is operated when the latter signal exceeds said predetermined value, and may disconnect power from the capacitor.

    Abstract translation: 通过监测电容器来检测作为感应电炉电路的一部分操作的电容器的初始故障，以确定当电介质材料劣化时由电容器产生的高频信号的存在。 这种信号的频率的下限在50至200kHz的范围内。 用于3kHz感应加热电路的感测装置包括检测器装置，用于当所产生的信号代表电介质的初始劣化时，将产生的超过约150kHz的信号转换成电平超过预定值的控制信号。 响应于控制信号的指示装置在后一信号超过所述预定值时被操作，并且可以断开电容器的电源。

    Inductive heating-cooling apparatus and method
    7.
    发明授权
    Inductive heating-cooling apparatus and method 失效
    电感式加热冷却装置及方法

    公开(公告)号：US3612805A

    公开(公告)日：1971-10-12

    申请号：US3612805D

    申请日：1970-04-27

    Applicant: INDUCTOTHERM CORP

    Inventor： KENNEDY THEODORE R

    IPC: H05B6/06 ,  H05B5/00 ,  H05B9/06

    CPC classification number: H05B6/06

    Abstract: Sections of an induction heating coil are connected in parallel with sections of a shunt coil so that the section to section impedance of the unit differs. Accordingly, the amount of heat power applied to sections of a metal object by the heating coil is varied according to a predetermined pattern. Electric power applied to the entire shunt coil and heating coil unit is lowered over a period of time to cool the metal object progressively along a geometrical axis.

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