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公开(公告)号：EP3627644A3
公开(公告)日：2020-04-22
申请号：EP19177530.3
申请日：2019-05-30
申请人： Phasor Ltd
发明人： TAMIR, Oren
摘要： A protection circuit provides a control voltage to a 3-phase contactor, where the three phases of the 3-phase power supply are inputs to the 3-phase contactor. The protection circuit includes: four input terminals, configured to be connected respectively to the three phases and to the neutral line of the 3-phase power supply; an output terminal, providing the control voltage to a control line of the 3-phase contactor; and control circuitry configured to provide the control voltage when any one or more of the three phases are live and when the neutral line is connected, and to provide no control voltage when all three phases are disconnected or when the neutral line is disconnected.
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公开(公告)号：EP2830206A4
公开(公告)日：2016-08-10
申请号：EP13764376
申请日：2013-02-06
发明人： SUGIMOTO TAKUYA , ARAO YUSUKE
CPC分类号： H02H3/253 , H02H7/1225 , H02M7/53875 , H02M2001/0009 , H02P27/06 , H02P29/0243
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公开(公告)号：EP2880457A1
公开(公告)日：2015-06-10
申请号：EP13735331.4
申请日：2013-07-12
申请人： Eaton Limited
IPC分类号： G01R31/40 , G01R31/42 , G01R19/155 , H02H3/253 , H02M7/08
摘要： A method and apparatus for detecting a missing phase in a 3-phase twelve-pulse autotransformer rectifier unit (ATRU) which, in use, receives a 3-phase input and delivers a nominal DC output on which a common-mode voltage is impressed. At least one of the frequency and amplitude of the common-mode voltage are monitored thereby to determine whether there is a missing phase in the input. The frequency and/or amplitude of the common-mode voltage may also be monitored thereby to determine whether there is a loss of input voltage.
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5.发明公开METHOD AND APPARATUS FOR IMPROVING OPERATIONAL RELIABILITY DURING A LOSS OF A PHASE VOLTAGE 审中-公开方法和设备不断提升操作可靠性研究A相电压损失
公开(公告)号：EP1884005A1
公开(公告)日：2008-02-06
申请号：EP06759811.0
申请日：2006-05-12
申请人： ABB Technology AG
发明人： PRICE, Elmo
摘要： The present invention is directed to a method and apparatus for improving operational reliability during a loss of a phase voltage (LOV) in a multi-phase power system, wherein a voltage representative of the LOV phase is calculated. The representative voltage is used for computing a reference polarizing voltage suitable for a protection unit.
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公开(公告)号：EP1411612A3
公开(公告)日：2006-09-27
申请号：EP03015344.9
申请日：2003-07-08
申请人： LG ELECTRONICS INC.
发明人： Lee, Byeong-Hoon , So, Min-Ho
摘要： In an apparatus and a method for detecting a phase state capable of improving reliability of an air conditioner by preventing an abnormal operation of the air conditioner by detecting a phase state (antiphase and open-phase) of three phase AC power supplied to the air conditioner and displaying the detected phase state, the apparatus includes a phase detector for detecting first, second and third phases of a three phase current; an interrupt detector for detecting a falling edge of a pulse signal corresponded to the third phase of the detected first, second and third phases, recognizing an interrupt occurrence by the third phase when the falling edge is detected and generating a counting signal; a counter for counting a pulse signal corresponded to the first and second phases on the basis of the interrupt occurred-third phase according to the counting signal; an antiphase/open-phase detector for detecting a state as a normal connection state, an antiphase state on the basis of a pulse signal corresponded to the first or second phase counted by the counter and detecting an open-phase state on the basis of the interrupt counting times; and a display unit for displaying a message indicating the antiphase state or the open-phase state or the normal connection state on a screen according to a control signal of the antiphase/open-phase detector.
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公开(公告)号：EP1064716B1
公开(公告)日：2005-08-17
申请号：EP98911797.3
申请日：1998-03-16
申请人： Automeg Inc.
CPC分类号： H02H7/0816 , G01R29/18 , G01R31/1227 , G01R31/343 , H02H3/353 , H02H11/005
摘要： An electric motor monitoring circuit apparatus (10) has a three phase electric motor (11) having an electric motor starter circuit. An insulation monitoring circuit (14) is coupled to the electric motor (11) and monitors insulation leakage of the motor (11). The insulation monitoring circuit (14) has a single phase AC power supply (36) for activating the starter circuit. A three phase monitor circuit (25) is coupled to the motor (11) for monitoring phase sequence in voltage amplitude for the motor (11). A relay circuit (22) inhibits activation of the motor upon detection of incorrect phasing or voltage or when insulation leakage exceeds a preselected threshold. The insulation monitoring circuit (14) closes a set of contacts to provide a ground return for the start circuit when the insulation monitor has determined the motor has passed the insulation monitor's test.
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公开(公告)号：EP0336943B1
公开(公告)日：1994-11-30
申请号：EP88908844.9
申请日：1988-09-16
申请人： SQUARE D COMPANY
摘要： In phase loss detection circuits a false indication can occur doing the starting, stopping and severe load transitions of a three-phase motor. The present phase loss detection circuit solves this problem by using a circuit (33) to detect the lost of a phase, a comparator (25), a changing capacitor (C5), a peak detection (21) and an overload voltage integrator (38), all of which provide a positive indication of either a phase loss or overload condition. The present phase loss circuit including transient protection which may be used with three-phase motors in a three-phase electrical system.
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公开(公告)号：EP3869213B1
公开(公告)日：2023-09-06
申请号：EP21156312.7
申请日：2021-02-10
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公开(公告)号：EP3869213A1
公开(公告)日：2021-08-25
申请号：EP21156312.7
申请日：2021-02-10
摘要： There are provided a three-phase AC power supply that outputs AC voltages in LI, L2, L3 phases, photocouplers that are connected to respective lines between the L1 phase and the L2 phase, the L2 phase and the L3 phase, and the L3 phase and the L1 phase of the three-phase AC power supply, and convert respective line voltages of the L1 phase and the L2 phase, the L2 phase and the L3 phase, and the L3 phase and the L1 phase of the three-phase AC power supply into a pulse detection signal, a light receiving element of the photocoupler that is set to turn on at a predetermined threshold voltage or higher, and a controller that performs an AND operation of each pulse detection signal to generate an AND operation pulse, and determines presence or absence of an open phase and interruption and which of the L1 phase, L2 phase, and L3 phase is the open phase when the open phase is present by each pulse detection signal and the AND calculation pulse.
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