| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 81 | Electrical protective device | US20693017 | 1917-12-13 | US1515197A | 1924-11-11 | GAZDA ADOLPH A |
| 82 | Control of alternating-current motors. | US1914845785 | 1914-06-18 | US1228852A | 1917-06-05 | VARLEY THOMAS W |
| 83 | Circuit-breaker tripping apparatus. | US1913775191 | 1913-06-23 | US1123809A | 1915-01-05 | SCOTT WILLIAM M |
| 84 | Reverse-phase relay. | US1909497598 | 1909-05-22 | US1025590A | 1912-05-07 | RICE HORACE E |
| 85 | Reverse-phase relay. | US1905258887 | 1905-05-04 | US854741A | 1907-05-28 | HEWLETT EDWARD M |
| 86 | Automatic diagnosis or repair for a generator controller | US14025499 | 2013-09-12 | US09787099B2 | 2017-10-10 | Isaac S. Frampton |
| A set of generators are connected in parallel using an electrical bus. One of the generators includes selectively connected inputs including a first input associated with a generator and a second input associated with the bus. A controller is configured to receive a first electrical characteristic from the first input assigned to a first connection and a second electrical characteristic from the second input assigned to a second connection. The controller is configured to generate a switching signal to assign the first input to the second connection or assign the second input to the first connection in response to a difference between the first electrical characteristic and the second electrical characteristic exceeding a threshold. | ||||||
| 87 | Three-phase portable airborne component extractor with rotational direction control | US14014756 | 2013-08-30 | US09272237B2 | 2016-03-01 | Brian J. Hammers; William Maske; Adam Joseph Frank |
| An extraction system is designed for metal working and other applications. The system may include a blower that delivers a positive pressure airflow to a hood that creates an air region for removal of airborne components from a work area. The blower is driven by a three-phase motor in a portable base unit that may be plugged into a source of three-phase power. A rotational direction reversing switch is provided between the motor and a three-phase plug to permit reversal of the rotational direction of the motor when the motor is determined not to rotation in the intended direction when the plug is connected to a receptacle. The switch may be manual or automatic. | ||||||
| 88 | Automatic Diagnosis or Repair for a Generator Controller | US14025499 | 2013-09-12 | US20150069858A1 | 2015-03-12 | Isaac S. Frampton |
| A set of generators are connected in parallel using an electrical bus. One of the generators includes selectively connected inputs including a first input associated with a generator and a second input associated with the bus. A controller is configured to receive a first electrical characteristic from the first input assigned to a first connection and a second electrical characteristic from the second input assigned to a second connection. The controller is configured to generate a switching signal to assign the first input to the second connection or assign the second input to the first connection in response to a difference between the first electrical characteristic and the second electrical characteristic exceeding a threshold. | ||||||
| 89 | Apparatus for interfacing a three phase power supply to a load | US11557981 | 2006-11-09 | US07633185B2 | 2009-12-15 | Shane M. Rowell |
| An apparatus monitors and controls application of three phases of alternating voltage to a load by detecting the sequence of the three phases. A switch module is operated, in response to the detected sequence, to ensure that the three phases are properly applied to the load, even if the utility lines are improperly connected. The monitoring also senses loss of a phase in which case the switch module disconnects the application of electricity to the load. The apparatus is capable of being used with different loads that operate at different peak to peak levels of alternating voltage. | ||||||
| 90 | System and method for fault contactor detection | US10786318 | 2004-02-25 | US20050185350A1 | 2005-08-25 | Scott Wakefield; Daniel Zuzuly; Scott Mayhew |
| A motor starter system comprises solid state switches for connection to an AC line for controlling application of AC power to the motor. A fault contactor has contacts. A motor wiring circuit operatively connects the solid state switches and fault contactor contacts with motor winding terminals. A voltage sensor senses AC line voltage and motor terminal voltage. A control circuit controls operation of the solid state switches and the fault contactor, including de-energizing the fault contactor in an off mode where AC line power is not supplied to the motor winding terminals. The control circuit detects AC line voltage and motor terminal voltage in the off mode and detect an error condition responsive to sensed AC line voltage being substantially different from motor terminal voltage in the off mode. | ||||||
| 91 | Phase monitor | US254189 | 1999-03-02 | US06150792A | 2000-11-21 | Hans Andersson |
| A phase monitor for a short-circuited asynchronous three-phase motor comprises a first and a second sensing unit, both of which are connected to a supply voltage line to the motor in order to sense the voltage conditions on the line, and a control switch which is controlled by the two sensing units and connected in a control circuit for a supply voltage switch for the motor, connected in the supply voltage line. When the supply voltage line is connected to a supply voltage source, the first sensing unit causes an immediate switching-on operation of the control circuit if the voltage conditions on the supply voltage line sensed by the first sensing unit at that moment are acceptable. After a switching-on operation of the control switch caused by the first sensing unit, the second sensing unit, which is operatively connected to the control switch via a delay unit, provides a delayed control of the state of the control switch in dependence upon the voltage conditions on the supply voltage line sensed by the second sensing unit. | ||||||
| 92 | Apparatus for controlling the starting of a three phase load with its normal phase sequence | US839821 | 1986-03-12 | US4667264A | 1987-05-19 | Sigeru Yamazaki; Mitsuhito Nakayama |
| An apparatus for controlling the starting of a three phase load in its normal phase sequence. The apparatus is connected to the load in a predefined manner and has input terminals for receiving three phase electric energy through external supply lines. There is provided a device within the apparatus which automatically corrects the phase sequence of the electric energy supplied to the load. An open phase protection device is provided which allows the starting of the load in response to the absence of open phase in the received electric energy, and inhibits the starting of the load in response to the presence of open phase in the received electric energy due to, for example, breaking of an external supply line. In one embodiment, the apparatus is built into a submersible motor-pump assembly. The pump is always initiated to rotate its impeller in a proper direction for pumping, regardless of correct or incorrect phase connections between the external supply lines and the input terminals of the apparatus. The open phase sensor and associated switches prevent a single phase mode of operation of the load. | ||||||
| 93 | Static protective relay | US367007 | 1982-04-09 | US4458283A | 1984-07-03 | Takashi Iida |
| A static protective relay at least includes a plurality of current transformers inserted in poly-phase AC power lines, a half-wave rectifying circuit for rectifying the output voltages from said current transformers, wave-shaping circuits for wave-shaping two of the pulsate output voltages from the half-wave rectifying circuit into rectangular wave output voltages, and a negative phase failure detecting circuit including a data flip-flop for detecting the level of the rectangular wave output to be phase-retarded at the instant of rising up of the rectangular wave output to be phase-advanced. | ||||||
| 94 | AC Electrical device protective thermal relay | US400448 | 1982-07-21 | US4412266A | 1983-10-25 | Masahiko Niino |
| A protective thermal relay comprises a main heater for heating a snap-action element of a bimetallic switch to open the switch. The main heater is connected in series with the motor or other device to be protected by the relay. There is also an auxiliary heater for the bimetal element that is energized through an abnormal condition detection relay, e.g., a negative phase sequence detector, when the abnormal condition occurs. The auxiliary heater is a positive temperature coefficient type and will heat and hold the switch in the motor off mode as long as the negative phase sequence or other abnormal situation remains. | ||||||
| 95 | Phase monitoring arrangement for a three phase network supplying a d.c. motor through a controlled converter | US727694 | 1976-09-28 | US4084205A | 1978-04-11 | Ulrich Bohnert |
| In a phase monitoring arrangement for a three phase network which supplies a controlled d.c. motor through a controlled converter, a power line dependent discriminator along with R-C circuits forms a smoothed, rectified monitoring voltage which depends on the phase sequence and is sensitive thereto and to phase failure along with a supplementary monitoring voltage dependent only on phase failure, the rectified monitoring voltage and supplementary monitoring voltage being supplied to an evaluating circuit comprising differential comparing amplifiers at which the monitoring voltages are compared with constant reference voltages independent of faults and the output thereof used to control switching means and a current regulator so that in the event of incorrect phase sequence or of a phase failure, the switching means feed a blocking signal which suppresses firing pulses to the controlled converter and the current regulator feeds a control signal to control the converter to its operating limit. | ||||||
| 96 | Phase sequence correcting system for three-phase AC power | US661895 | 1976-02-27 | US4021704A | 1977-05-03 | Dean K. Norbeck |
| The phase sequence of a three-phase AC power supply is detected and information representing that sequence is stored in a memory device, such as a flip-flop. Since the power supply, once it is energized, may require a few seconds to stabilize (such as may be the case when the power source is a diesel generator), the information fed to the memory device is likely to change during the stabilizing period. At the end of that period, however, the stored information represents the true phase sequence of the AC power supply, and at that time the information is read out and used to actuate switching apparatus to interconnect the three-phase AC power supply to the three terminals of a phase-sensitive load (such as a three-phase AC motor) in the manner necessary to provide the load with a desired phase rotation sequence. After the stabilizing period, the input circuitry of the memory device is inhibited so that the stored information representing the true phase sequence will be locked into the memory device and so that the device will be insensitive to any fluctuating voltages, frequency or noise that could otherwise cause an accidental phase reversal while the load is energized. | ||||||
| 97 | Phase sequence detector for three-phase AC power system | US583719 | 1975-06-04 | US3976919A | 1976-08-24 | Joseph E. Vandevier; David R. Ellis-Anwyl |
| The phase sequence of the phase currents supplied by a three-phase AC power supply to a phase-sensitive load (such as a three-phase AC motor) is monitored by developing three phase-displaced, rectangular shaped logic signals, respectively representing the three phase currents, and applying these logic signals to respective ones of the J, C and K inputs of a J-K flip-flop. When the load is correctly connected to the power supply, the phase relationship of the three logic signals will be appropriate to trigger the flip-flop to its set operating state. Any other sequence actuates the flip-flop to its reset state which, in turn, disconnects the load from the power supply. | ||||||
| 98 | Detector for reverse and open phase in a three phase circuit | US36204973 | 1973-05-21 | US3838314A | 1974-09-24 | BOOTHMAN D; NUTT D |
| According to the invention a transducer coupled to a three phase AC supply for a load provides three trains overlapping voltage waveforms displaced 120* in time and of phase sequence following the supply sequence. A waveform converter converts these voltage waveforms into three trains of square waveforms of the same repetition rate, substantially the same duration, and displaced 120* in time but overlapping in duration. The square waveforms are then impressed on a wye circuit configuration consisting of a resistor and a gate controlled semiconductor connected in series and to the wye point in that order for each leg. Each semiconductor is gated on upon its anode going positive by another waveform which is of gating polarity and overlaps the positive going anode waveform. During normal three phase operation of the load, the positive voltages on the anodes of the semiconductor are substantially zero. During reversal or loss of phase of the load, these voltages are no longer zero and are detected by a detector circuit which signals the presence of the fault.
|
||||||
| 99 | Phase protection system for ac power lines | US3783354D | 1972-09-29 | US3783354A | 1974-01-01 | FLETCHER J; WING J WONG |
| A phase protection system is provided for protecting phase sensitive loads from being or remaining connected to AC power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a DC power relay circuit, an ACto-DC converter for energizing the relay circuit, and a bi-stable 4-terminal transducer coupled between the phase detection circuit and the power relay circuit, for controlling both circuits.
|
||||||
| 100 | Monitor for phase sequence and loss | US3764904D | 1970-12-07 | US3764904A | 1973-10-09 | DREXLER J |
| A monitor detects improper phase sequence or phase loss in a three phase system. A thyristor and a series connected relay are directly connected between two line conductors. A network using only two resistors and one capacitor connects all three line conductors to a summing junction connected through a variable resistive path to the gate of the thyristor to continuously actuate the relay when the desired phase sequence rotation is present.
|
||||||
QQ群二维码
意见反馈
意见反馈