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公开(公告)号：US4041540A
公开(公告)日：1977-08-09
申请号：US654425
申请日：1976-02-02
CPC分类号： H02H3/093
摘要： A self-powered solid state overload relay circuit having current transformers energized by conductors supplying current to a multiphase alternating current motor. The transformers have secondary windings connected to charge a capacitor with a voltage indicative of the magnitude of the maximum current in the motor windings. The circuit includes presetable impedance circuits which permit the circuit to be easily programmed to respond to a range of abnormal motor currents in the winding in motors of varying size and service factor ratings, components which are arranged to duplicate the operation of melting alloy and bimetal type overload relays in an automatic or in a trip-free manual reset mode, a light emitting device which visually indicates when the relay is in a tripped state, and components which cause the relay to be insensitive to ambient temperature variations.
摘要翻译： 一种自供电的固态过载继电器电路，其具有通过向多相交流电动机提供电流的导体供电的电流互感器。 变压器具有连接到电容器的次级绕组，其中电压表示电动机绕组中最大电流的大小。 该电路包括可预设的阻抗电路，其允许电路容易地被编程以响应不同尺寸和使用系数额定值的电动机中的绕组中的异常电动机电流的范围，这些组件被布置为复制熔融合金和双金属型的操作 自动或无跳闸手动复位模式的过载继电器，可视地指示继电器何时处于跳闸状态的发光装置以及使继电器对环境温度变化不敏感的部件。
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公开(公告)号：US4344102A
公开(公告)日：1982-08-10
申请号：US188407
申请日：1980-09-18
CPC分类号： H01H47/32
摘要： An anti-telegraph circuit for locking out the circuit controlling the flow of direct current in a coil winding of an electromagnetically operated switching device, such as a contactor, from an alternating current source whenever improper control voltages are present which would cause repeated operations of the armature picking up and falling out of its sealed position.
摘要翻译： 一种防电路，用于锁定电路，控制电磁操作的开关装置（例如接触器）的线圈绕组中的直流电的流动，每当存在不正确的控制电压时，交流电源将导致重复操作 电枢从其密封位置拾起并脱落。
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公开(公告)号：US4634951A
公开(公告)日：1987-01-06
申请号：US743862
申请日：1985-06-03
申请人： Julian C. Kampf , Jeffrey A. Reichard , James T. Libert , Earl J. Curran, Jr. , Richard J. Graefe
发明人： Julian C. Kampf , Jeffrey A. Reichard , James T. Libert , Earl J. Curran, Jr. , Richard J. Graefe
CPC分类号： H02P1/28
摘要： Gradual starting of an electric motor is provided by increasing the voltage applied to the motor. A reduced voltage starter controls the application of a voltage derived from a line voltage to a motor by using a voltage ramp acceleration control circuit comprising, means for generating a ramp voltage having a predetermined rate of rise, means for controlling the voltage applied to the motor in response to the ramp voltage, means for sensing that the motor is running at substantially full speed, and means responsive to the means for sensing that the motor is running at substantially full speed for increasing the predetermined rate of rise of the ramp voltage, whereby under conditions where the motor is running at substantially full speed before the voltage applied to the motor reaches the line voltage, then the voltage applied to the motor will rise at the increased predetermined rate of rise of the ramp voltage.
摘要翻译： 通过增加施加到电动机的电压来提供电动机的逐渐启动。 降压起动器通过使用电压斜坡加速度控制电路来控制从线路电压得到的电压的应用，所述电压斜坡加速度控制电路包括用于产生具有预定升高速率的斜坡电压的装置，用于控制施加到电动机的电压的装置 响应于斜坡电压，用于感测电动机以基本全速运行的装置，以及响应于用于感测电动机以基本上全速运行的装置的装置，以增加斜坡电压的预定上升速率， 在电动机施加到电动机的电压达到线路电压之前，电动机以大致全速运行的条件下，施加到电动机的电压将以增加的斜坡电压的预定上升速率上升。
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公开(公告)号：US4409640A
公开(公告)日：1983-10-11
申请号：US319487
申请日：1981-11-09
申请人： Mark V. Profio , James T. Libert , Julian C. Kampf
发明人： Mark V. Profio , James T. Libert , Julian C. Kampf
IPC分类号： H01H47/18
CPC分类号： H01H47/18
摘要： This disclosure depicts a novel abort cycle timer circuit for use with an AC source of electrical power and for operating electrical controls for machinery. The circuit provides a substantially DC voltage and current, first and second relays with normally open and normally closed contacts and a timing abort circuit. Opening a first of two switches causes the second of the two relays to energize after a time delay. Opening both switches causes the second relay to deenergize after a predetermined time. The novel circuit has improved immunity to electrical and magnetic noise.
摘要翻译： 该公开描述了一种新型的中止周期定时器电路，其用于与AC电源并用于机械的电气控制。 该电路提供了具有常开和常闭触点和定时中止电路的基本上直流电压和电流的第一和第二继电器。 打开两个开关中的第一个使得两个继电器中的第二个在延时后通电。 打开两个开关使得第二继电器在预定时间后断电。 新颖的电路具有改善对电磁噪声的抗扰性。
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公开(公告)号：US4345288A
公开(公告)日：1982-08-17
申请号：US260545
申请日：1981-05-04
摘要： A solid state overload relay protective apparatus for electric motors which includes not only the overload feature, but the additional features of underload and single phase protection. Small current transformers for sensing the current flow in each phase of the motor are utilized, like those found in the ground fault sensing art because a current-to-voltage converter circuit reflects a short circuit back to the secondary of the transformers. The signal from the current transformers which is proportional to the sensed current in the motor is fed through the converter, a scaling and summing amplifier adjustable for a wide range of motor full load currents, an ideal diode peak detector, a time integrator amplifier, to one input of a comparator circuit having a trip reference voltage signal at another input. The comparator provides an output signal to a transistorized trip level circuit that deenergizes a coil of an overload relay opening its contacts and interrupting power to the motor.
摘要翻译： 一种用于电动机的固态过载继电保护装置，不仅包括过载特性，而且还包括欠载和单相保护的附加特性。 用于感测电动机每相中的电流的小电流互感器被利用，如在接地故障感测领域中发现的那样，因为电流 - 电压转换器电路将短路反射回到变压器的次级。 与电动机中检测到的电流成比例的来自电流互感器的信号通过转换器馈送，对于宽范围的电动机满载电流可调节的缩放和求和放大器，理想的二极管峰值检测器，时间积分放大器 比较器电路的一个输入在另一个输入端具有跳闸参考电压信号。 比较器向晶体管跳闸电平电路提供输出信号，该电路使过载继电器的线圈断电，断开其触点并中断电机的电力。
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