WO2015158218A1 - 一种电动机再起动控制器 - Google Patents

一种电动机再起动控制器 Download PDF

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Publication number
WO2015158218A1
WO2015158218A1 PCT/CN2015/076265 CN2015076265W WO2015158218A1 WO 2015158218 A1 WO2015158218 A1 WO 2015158218A1 CN 2015076265 W CN2015076265 W CN 2015076265W WO 2015158218 A1 WO2015158218 A1 WO 2015158218A1
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Prior art keywords
contactor
contact
relay
voltage
controller
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PCT/CN2015/076265
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English (en)
French (fr)
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程涛
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深圳市倍通控制技术有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details of starting control
    • H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
    • H02P1/10—Manually-operated on/off switch controlling relays or contactors operating sequentially for starting a motor

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  • the invention relates to the technical field of industrial control, and in particular to a motor restart controller.
  • AC contactors and frequency converters are commonly used in modern industrial low-voltage motor control loops, and their characteristics are self-sustaining and pressure-free.
  • the motor when the motor is running normally, it will encounter the instantaneous voltage loss of the power supply, which will cause the contactor release and the low voltage protection trip of the inverter.
  • the power supply When the power supply is automatically restored, it needs to be manually restarted to resume the motor operation, resulting in unnecessary shutdown of the motor during operation. Interruption, which will cause great economic losses to petroleum, petrochemical, chemical, electric power, metallurgical and other continuous production enterprises, and even lead to safety accidents.
  • the enterprise does not set the impedance isolation component to reduce the power consumption. Therefore, when the adjacent network in the main network or the enterprise medium-voltage network is faulty, it is unavoidable.
  • the momentary voltage loss is caused, and the time of the voltage loss depends on the cutting time of the adjacent line fault.
  • the shortest cut-off time for the medium-voltage line short-circuit fault is the transformer's exit saturation time plus the inherent breaking time of the circuit breaker, about 210ms. Most of the instantaneous voltage loss is caused by the fault of the adjacent line.
  • the time is to cut off the fault time, and the voltage loss trip time of the AC contactor should be no more than 3 cycles, that is, less than 60ms.
  • the conventional microprocessor-based restart device cannot capture the response quickly. Since the voltage changes instantaneously, the instantaneous voltage loss "shake" for the power supply below 200ms does not work. Therefore, in order to quickly respond to the instantaneous power loss of the power supply below 200ms, it is necessary to avoid the inherent characteristics of the computer data acquisition and refresh cycle, and the non-computer method is adopted, and the prior art does not solve the technical problem.
  • the technical problem to be solved by the present invention is to provide a motor restart controller, It solves the problem of quick response to the instantaneous voltage loss of the power supply through non-computer, thus fundamentally solving the problem of contactor release due to sloshing and tripping of the inverter low voltage protection, ensuring that the rotating motor is accelerated after the power is restored.
  • the motor restart controller provided by the present invention comprises: a backup power supply unit for supplying power to the controller when the commercial power is instantaneously undervoltage or voltage loss; and a logic relay unit respectively connected to the backup power supply unit, for presetting the time limit a controlled time relay unit and an output relay for providing an output contact, wherein:
  • the logic relay unit has a pair of power terminals connected to the live line and the neutral line respectively, detecting the instantaneous recessed amplitude of the power supply voltage, and the pair of input terminals are connected with the normally open auxiliary contact of the contactor or the signal contact of the inverter, and the detecting contactor Or the state of the inverter; when the contactor normally open auxiliary contact is detected or the inverter running signal contact is disconnected, the output contact of the control output relay is instantaneously closed; if the instantaneous recessed amplitude of the power supply voltage reaches a preset amplitude, and
  • the output contact is controlled by the time relay unit controlling the opening or closing of the backup power switch of the output relay within the preset allowable voltage loss time limit before the contactor normally open auxiliary contact or the inverter running signal contact is disconnected.
  • the action mode is: within the allowable pressure loss time limit, the instantaneous closing, the delay is broken.
  • the logic relay unit comprises a voltage detecting circuit, a contactor state detecting circuit, a logic determining circuit and a backup power control circuit, wherein:
  • the voltage detecting circuit has an input end connected to the hot line and the neutral line of the control power source, and detects the instantaneous recessed amplitude of the power supply voltage, and outputs the signal to the logic judging circuit;
  • the contactor state detecting circuit the input end is connected with the contactor normally open auxiliary contact or the inverter running signal contact, detecting the state of the contactor normally opening auxiliary contact or the inverter running signal contact, and outputting to the logic judging circuit;
  • the logic judging circuit determines whether the contactor or the inverter is due to the sloshing cause according to whether the instantaneous sag amplitude of the power supply voltage reaches a preset amplitude and occurs before the contactor normally open auxiliary contact or the inverter running signal contact is disconnected. disconnect;
  • the backup power control circuit is configured to control whether the backup power switch of the output relay is closed or disconnected according to whether the contactor or the inverter is disconnected due to the swaying cause, and the time relay unit is within the preset allowable voltage loss time limit.
  • the voltage detecting circuit comprises a voltage relay and an auxiliary circuit thereof.
  • the voltage detecting circuit is further configured to detect a momentary change of the voltage.
  • the logic determining circuit is further configured to: according to whether the instantaneous change amount of the voltage reaches a preset slope, and occurs before the instantaneous recessed amplitude reaches a preset amplitude, Determine if the contactor or inverter is disconnected due to sloshing.
  • the preset amplitude is 45% to 55% of the control power supply voltage, and the preset slope is 10 to 20%.
  • the time relay unit comprises a time relay circuit that cures at least at the factory or cures the time parameter by a digital display device; the time parameter includes a preset allowable pressure loss time limit.
  • the preset allowable voltage loss time limit is 500 milliseconds.
  • the backup power supply unit comprises a built-in capacitor, a first switch control circuit and a second switch control circuit, the first switch control circuit is configured to control whether the controller is powered, and the second switch control circuit is configured to control whether the output relay is powered .
  • the capacitor is preferably a super capacitor.
  • the controller further comprises an intermediate signal relay unit connected to the backup power unit for providing a time-limited latching contactor or an inverter and an external connection under the control of the logic relay unit in the DCS and PLC signal interlocking control circuit At least one pair of status signals of the output operational status signal of the relay maintains the contact.
  • an intermediate signal relay unit connected to the backup power unit for providing a time-limited latching contactor or an inverter and an external connection under the control of the logic relay unit in the DCS and PLC signal interlocking control circuit At least one pair of status signals of the output operational status signal of the relay maintains the contact.
  • the motor restart controller of the embodiment of the invention adopts the relay electronic control mode, and the sacrificial judgment fuzzy control technology which is mutually locked by the analog calculation formula and the logic judgment type, can realize the electrical logic control without a computer program or software.
  • the invention solves the problem of rapid response to the instantaneous voltage loss of the power supply below 200ms, thereby fundamentally solving the problem of the release of the contactor caused by the sloshing, and realizing that the response time to the instantaneous voltage loss of the voltage reaches 0 seconds or more without dead zone.
  • FIG. 1 is a schematic structural diagram of a module of a motor swaying power restart controller according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a logic relay unit according to a preferred embodiment of the present invention.
  • Fig. 3 is a schematic diagram showing an example of wiring of the present invention applied to a contactor.
  • Fig. 4 is a schematic diagram showing an example of wiring of the present invention applied to a frequency converter.
  • a motor sway power restart controller provided by an embodiment of the present invention includes a logic relay unit 10, a time relay unit 20, a backup power unit 40, and an output relay 50, a time relay unit 20, and a backup unit.
  • the power supply unit 40 and the output relay 50 are respectively connected to the backup power supply unit 40, wherein:
  • the logic relay unit 10 has a pair of power terminals connected to the live line and the neutral line respectively, detecting the instantaneous recessed amplitude of the power supply voltage, and the pair of input terminals are connected with the contactor normally open auxiliary contact or the inverter running signal contact, detecting contact The state of the device or the inverter; when the contactor normally open auxiliary contact is detected or the inverter running signal contact is disconnected, the output contact of the control output relay 50 is instantaneously closed; if the instantaneous recessed amplitude of the power supply voltage reaches a preset amplitude And before the contactor normally open auxiliary contact or the inverter running signal contact is disconnected, the time relay unit 20 is controlled to disconnect the backup power switch of the output relay 50 within a preset allowable voltage loss time limit. Closed to control the output contact action mode: within the allowable pressure loss time limit, instantaneous closing, delay opening.
  • the logic relay unit 10 supplies power to the entire controller loop by controlling the first switch 401 of the backup power supply unit 40, and controls the disconnection of the output relay 50 by the opening and closing of the second switch 401 of the backup power supply unit 40. With closed.
  • the time relay unit 20 is configured to preset time limit control.
  • the time relay unit comprises a time relay that is solidified at the factory or solidified by a digital display device, and the time parameter is a preset allowable pressure loss time.
  • the preset allowable voltage loss time limit is between 0-20 seconds, preferably 500 milliseconds.
  • the backup power unit 40 is used to supply power to the controller when the commercial power is instantaneously undervoltage or voltage loss.
  • the backup power unit 40 includes a built-in capacitor, a first switch control circuit 401, and a second The switch control circuit 402 is configured to control whether the controller is powered, and the second switch control circuit 402 is configured to control whether the output relay 50 is powered.
  • the capacitor is preferably a super capacitor to extend the life of the controller.
  • An output relay 50 is provided for providing an output relay of the output contact.
  • the output contact of the output relay 50 is turned off, and when the switch of the backup power unit of the output relay 50 is closed, the output contact of the output relay 50 is closed.
  • the controller further includes an intermediate signal relay unit connected to the backup power unit 40 for providing time-limited latching contact under the control of the logic relay unit 10 in the DCS and PLC signal interlock control circuit. At least one pair of status signals of the output operational status signal of the inverter or the frequency converter and the external relay maintains the contact.
  • the switch of the backup power supply unit of the intermediate signal relay unit is controlled by the time relay unit within a preset allowable voltage loss time limit. Closed or disconnected to limit the output operating status signal of the contactor or the inverter and the external relay.
  • a logic relay unit 10 includes a voltage detecting circuit 101, a contactor state detecting circuit 102, a logic determining circuit 103, and a backup power control circuit 104, wherein:
  • the voltage detecting circuit 101 is connected to the hot line and the neutral line of the control power source, detects the instantaneous recessed amplitude of the power supply voltage, and outputs the voltage to the logic determining circuit 103.
  • the voltage of the control power source can be 220Vac (plug-in type) or 380V (fixed type).
  • the contactor state detecting circuit 102 is connected to the contactor normally open auxiliary contact or the inverter running signal contact, and detects the state of the contactor normally open auxiliary contact or the inverter running signal contact, and outputs the state to the logic determining circuit 103.
  • the logic judging circuit 103 determines whether the contactor or the inverter is swayed according to whether the instantaneous recessed amplitude of the power supply voltage reaches a preset amplitude and occurs before the contactor normally open auxiliary contact or the inverter running signal contact is disconnected. The reason is broken.
  • the voltage detecting circuit 101 includes a voltage relay and its auxiliary circuit.
  • the voltage detecting circuit 101 is further configured to detect a voltage instantaneous change amount.
  • the logic determining circuit 103 is further configured to: according to whether the instantaneous voltage change amount reaches a preset slope, and the instantaneous concave amplitude reaches a preset amplitude. Before, judge whether the contactor or inverter is disconnected due to the sway.
  • the preset amplitude value is between 45% and 55% of the control power supply voltage, preferably 50% of the control power supply voltage, and the preset slope is between 10% and 20%, preferably 15%.
  • FIG. 3 is a schematic diagram showing an example of the wiring of the present invention applied to the contactor.
  • the three-phase coils L1, L2, L3, the three-phase circuit breaker MCCS, the fuse Fuse, the contactor KC, and the motor M form a main circuit.
  • the motor restart controller DZQ-B is connected in parallel to the controller of the contactor KC.
  • the DZQ-B includes 8 contacts, among which:
  • the first contact and the second contact the power supply terminal of the logic relay unit of the DZQ-B, the first contact is connected to the live line L11 of the control power supply as the input power of the DZQ-B; the second contact is connected to the neutral line, considering the electronic device. Protection, the 2nd contact should be grounded reliably.
  • the docking point is also a detection point for detecting the change of the L11 power supply voltage, and collects and detects the instantaneous recessed amplitude of the power supply voltage.
  • the third contact and the fourth contact are input terminals of the logic relay unit of the DZQ-B, and are connected to a pair of normally open points of the contactor KC.
  • the contactor KC When the contactor KC is sucked, the contactor KC normally connected to the third contact and the fourth contact is closed, and the internal power of the DZQ-B is turned on, indicating that the contactor KC is in the pull-in state, and the motor is normally operated.
  • the logic relay unit of the DZQ-B further determines whether the contactor KC is swayed on the power supply side or is normally tripped, if not caused by sloshing Then, the backup power supply of DZQ-B is immediately released. If it is caused by shaking, the backup power supply delay of DZQ-B is released.
  • the 5th contact and the 7th contact are the signal output contacts of the DZQ-B and also the dry contacts of the intermediate signal relay unit.
  • the contactor KC is closed after the pull-in is closed. If the contactor is disconnected due to the sloshing, the logic relay unit of DZQ-B controls the 5th contact and the 7th contact to continue to close, and the delay is opened. If the voltage recovers within the preset time, the contactor KC pulls in, the 5th contact and the 7th contact continue to close; if the voltage does not recover within the preset time, Then the 5th contact and the 7th contact are disconnected. If the contactor is not disconnected due to sloshing, the 5th contact and the 7th contact are disconnected.
  • the 6th contact and the 8th contact are the output contacts of DZQ-B, and are also the normally open dry contacts of the output relay.
  • the logic relay unit of DZQ-B controls the 6th contact and the 8th contact to close immediately, and the running command is blocked for a limited time, and then it is further determined within the time limit whether the contactor KC is broken due to the sloshing. open.
  • the sixth contact and the eighth contact continue to be closed, and the delay is turned off. If it is judged that the contactor KC is not tripped due to the swaying, indicating that it is a normal stop or a faulty stop, the sixth contact and the eighth contact do not perform an action (ie, disconnect), so that no malfunction is caused. It should be noted that the scope of the “limited time” of this paragraph does not exceed the requirements of national or international electrical related regulations.
  • the DZQ-B has a pair of output contacts (6th contact and 8th contact) and a pair of output signal contacts (5th contact and 7th contact) interlocked with the DCS. It should be noted that the 5th contact And the 7th contact can be no or as many as needed.
  • the motor restart controller DZQ-B is connected to the contactor anti-sloshing control loop. When the grid is under-voltage “shock”, the DZQ-B provides a delay to the contactor after the AC contactor and the self-holding contact are disconnected. The auxiliary maintenance of the disconnection is based on the contact voltage of the contactor core coil as a voltage threshold value, and is closed again after the power source is restored, thereby maintaining the continuous operation of the motor. Instead of slamming, the contactor is released, and the DZQ-B does not provide an auxiliary hold contact that is delayed.
  • FIG. 4 is a schematic diagram of an example wiring of the present invention applied to a frequency converter.
  • the motor restart controller DZQ-BX is connected in parallel to the inverter control circuit, and outputs two pairs of contacts.
  • the main output contact (6-8) is used for the restart command of the inverter and the relay to coincide.
  • the main output contact is only activated after the inverter is running normally. Only when the inverter and relay are tripped due to voltage flashing, the coincidence command is issued, and the call is automatically reset after successful coincidence.
  • the status signal holding contact (5-7) is used to lock the inverter running signal, and the delay is closed after the inverter runs normally. After the inverter and relay are tripped due to voltage flashing, the delay is released.
  • the status signal holding contact (5-7) is released immediately when the inverter is not tripped due to the cause of the voltage drop, and will not be maintained.
  • a plurality of pairs of state signal holding contacts for the time-limited latching frequency converter and the output operating state signal of the external relay are provided.
  • the motor restart controller of the embodiment of the invention adopts the relay electronic control mode, and the sacrificial judgment fuzzy control technology which is mutually locked by the analog calculation formula and the logic judgment type, can realize the electrical logic control without a computer program or software.
  • the invention solves the problem of rapid response to the instantaneous voltage loss of the power supply below 200ms, thereby fundamentally solving the problem of the release of the contactor caused by the sloshing, and realizing that the response time to the instantaneous voltage loss of the voltage reaches 0 seconds or more without dead zone.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

一种电动机再起动控制器，属于工业控制技术领域，包括逻辑继电单元（10）、时间继电单元（20）、后备电源单元（40）和输出继电器（50）；逻辑继电单元检测到接触器常开辅助触点或者变频器运行信号接点断开瞬间，控制输出继电器的输出接点瞬时闭合；如果检测到电源电压的瞬时凹陷幅值达到预设的幅度、且发生在接触器辅助触点断开或者变频器运行信号接点断开之前，则通过时间继电单元在预设的允许失压时限内控制输出继电器的后备电源开关的断开或闭合来控制输出接点动作方式为：在允许失压时限内，瞬时闭合，延时断开。

Description

一种电动机再起动控制器 技术领域
本发明涉及工业控制技术领域，尤其涉及一种电动机再起动控制器。
背景技术
交流接触器和变频器普遍用于现代工业低压电动机控制回路，它的特性带电自保持，无压释放。然而，电动机正常运行时遭遇电源瞬时失压，会引起接触器释放和变频器低电压保护跳闸的问题，当电源自动恢复后需要人工重新操作恢复电动机运转，造成运行中电动机不必要停机，使生产中断，这对会对石油、石化、化工、电力、冶金等连续性生产企业造成的很大的经济损失，甚至导致安全事故。
随着主电网的环网化以及企业中压电网供电线路的增加，而企业为降低电耗不设阻抗隔离元件，这样，当主网或企业中压电网中相邻线路故障时无可避免的引起瞬时失压，失压时间取决于相邻线路故障的切除时间。对于中压线路短路故障的最短切除时间就是互感器退出饱和时间加断路器固有分断时间，约210ms。绝大多数瞬间失压几乎都是因相邻线路故障所致，时间就是切除故障时间，而交流接触器的失压脱扣时间应不大于3个周波，即小于60ms。
目前，对于因“晃电”引起的接触器释放，由于微处理器的电压采集刷新周期时间要大于电源瞬时故障时间(比如200ms)，常规的微处理器方式的再起动设备因无法快速捕捉响应到电压瞬时变化，所以针对200ms以下的电源瞬时失压“晃电”无法起作用。因此，为了能快速响应200ms以下的电源瞬时失压，需要规避计算机数据采集与刷新周期的固有特性，采用非计算机的方式来实现，现有技术没有解决该技术问题。
发明内容
有鉴于此，本发明要解决的技术问题是提供一种电动机再起动控制器，以 解决通过非计算机的方式实现对电源瞬时失压快速响应，从而从根本上解决因晃电引起接触器释放和变频器低电压保护跳闸的问题，确保电源恢复后，正在旋转的电动机再加速起动。
本发明解决上述技术问题所采用的技术方案如下：
本发明提供的电动机再起动控制器包括：用于市电瞬时欠压或失压时对控制器进行供电的后备电源单元；以及分别与后备电源单元相连的逻辑继电单元、用于预设时限控制的时间继电单元和用于提供输出接点的输出继电器，其中：
逻辑继电单元，其一对电源端子分别与火线及零线相连，检测电源电压瞬时凹陷幅值，其一对输入端子与接触器常开辅助触点或者变频器运行信号接点相连，检测接触器或者变频器的状态；当检测到接触器常开辅助触点或者变频器运行信号接点断开瞬间，控制输出继电器的输出接点瞬时闭合；如果电源电压的瞬时凹陷幅值达到预设的幅度、且发生在接触器常开辅助触点或者变频器运行信号接点断开之前，则通过时间继电单元在预设的允许失压时限内控制输出继电器的后备电源开关的断开或闭合来控制输出接点动作方式为：在允许失压时限内，瞬时闭合，延时断开。
优选的，逻辑继电单元包括电压检测电路、接触器状态检测电路、逻辑判断电路和后备电源控制电路，其中：
电压检测电路，输入端与控制电源的火线及零线相连，检测电源电压瞬时凹陷幅值，输出给逻辑判断电路；
接触器状态检测电路，输入端与接触器常开辅助触点或者变频器运行信号接点相连，检测接触器常开辅助触点或者变频器运行信号接点的状态，输出给逻辑判断电路；
逻辑判断电路，根据电源电压的瞬时凹陷幅值是否达到预设的幅度、且发生在接触器常开辅助触点或者变频器运行信号接点断开之前，判断接触器或者变频器是否由于晃电原因断开；
后备电源控制电路，用于根据接触器或者变频器是否由于晃电原因断开，通过时间继电单元在预设的允许失压时限内,控制输出继电器的后备电源开关的闭合或断开。
优选的，电压检测电路包括电压继电器及其辅助电路。
优选的，电压检测电路还用于检测电压瞬时变化量，相应地，逻辑判断电路还用于根据电压瞬时变化量是否达到预设的斜率、且发生在瞬时凹陷幅值达到预设的幅度之前，判断接触器或者变频器是否由于晃电原因断开。
优选的，预设的幅度为控制电源电压的45％～55％，预设的斜率为10～20％。
优选的，时间继电单元包括至少在出厂时固化或者通过数显装置固化时间参数的时间继电电路；时间参数包括预设的允许失压时限。
优选的，预设的允许失压时限为500毫秒。
优选的，后备电源单元包括内置的电容、第一开关控制电路和第二开关控制电路，第一开关控制电路用于控制是否给控制器供电，第二开关控制电路用于控制是否给输出继电器供电。其中，电容优选为超级电容。
优选的，控制器还包括中间信号继电单元，与后备电源单元相连，用于在DCS和PLC信号连锁控制电路中，在逻辑继电单元的控制下提供限时闭锁接触器或者变频器以及外接的继电器的输出运行状态信号的至少一对状态信号保持接点。
本发明实施例的一种电动机再起动控制器，采用继电电子一体化方式，通过模拟算式和逻辑判式相互闭锁的牺牲判式模糊控制技术，不需要计算机程序或软件即可实现电气逻辑控制，解决对200ms以下的电源瞬时失压快速响应，从而从根本上解决因晃电引起接触器释放的问题，实现了对电压瞬时失压的响应时间达到0秒以上无死区。
附图说明
图1为本发明实施例提供的一种电动机晃电再起动控制器的模块结构示意图。
图2为本发明优选实施例提供的一种逻辑继电单元的结构示意图。
图3为将本发明应用于接触器的实例接线原理图。
图4为将本发明应用于变频器的实例接线原理图。
具体实施方式
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚、明白，以下结合附图和实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例一
如图1所示，本发明实施例提供的一种电动机晃电再起动控制器包括逻辑继电单元10、时间继电单元20、后备电源单元40和输出继电器50，时间继电单元20、后备电源单元40和输出继电器50分别与后备电源单元40相连，其中：
逻辑继电单元10，其一对电源端子分别与火线及零线相连，检测电源电压瞬时凹陷幅值，其一对输入端子与接触器常开辅助触点或者变频器运行信号接点相连，检测接触器或者变频器的状态；当检测到接触器常开辅助触点或者变频器运行信号接点断开瞬间，控制输出继电器50的输出接点瞬时闭合；如果电源电压的瞬时凹陷幅值达到预设的幅度、且发生在接触器常开辅助触点或者变频器运行信号接点断开之前，则通过时间继电单元20在预设的允许失压时限内，控制输出继电器50的后备电源开关的断开或闭合来控制输出接点动作方式为：在允许失压时限内，瞬时闭合，延时断开。
具体来说，逻辑继电单元10通过控制后备电源单元40的第一开关401给整个控制器回路供电，通过控制后备电源单元40的第二开关401的断开与闭合控制输出继电器50的断开与闭合。
时间继电单元20，用于预设时限控制。
优选的，时间继电单元包括在出厂时固化或者通过数显装置固化时间参数的时间继电器，时间参数分别为预设的允许失压时间。其中预设的允许失压时限取值在0-20秒之间，优选为500毫秒。
后备电源单元40，用于市电瞬时欠压或失压时对控制器进行供电。
优选的，后备电源单元40包括内置的电容、第一开关控制电路401和第二 开关控制电路402，第一开关控制电路401用于控制是否给控制器供电，第二开关控制电路402用于控制是否给输出继电器50供电。其中，电容优选为超级电容以便延长控制器的寿命。
输出继电器50，用于提供输出接点的输出继电器。
具体来说，当输出继电器50的后备电源单元开关断开时，输出继电器50的输出接点断开，当输出继电器50的后备电源单元的开关闭合时，输出继电器50的输出接点闭合。
作为一种优选的方案，上述控制器还包括中间信号继电单元，与后备电源单元40相连，用于在DCS和PLC信号连锁控制电路中，在逻辑继电单元10的控制下提供限时闭锁接触器或者变频器以及外接的继电器的输出运行状态信号的至少一对状态信号保持接点。具体来说，在DCS和PLC信号连锁控制电路中，在逻辑继电单元的控制下，通过时间继电单元在预设的允许失压时限内控制中间信号继电单元的后备电源单元的开关的闭合或断开，以限时闭锁接触器或者变频器以及外接的继电器的输出运行状态信号。
实施例二
如图2所示，本发明优选实施例提供的一种逻辑继电单元10包括电压检测电路101、接触器状态检测电路102、逻辑判断电路103和后备电源控制电路104，其中：
电压检测电路101，输入端与控制电源的火线及零线相连，检测电源电压瞬时凹陷幅值，输出给逻辑判断电路103。其中，控制电源的电压可以为220Vac(插拔式)或380V(固定式)。
接触器状态检测电路102，输入端与接触器常开辅助触点或者变频器运行信号接点相连，检测接触器常开辅助触点或者变频器运行信号接点的状态，输出给逻辑判断电路103。
逻辑判断电路103，根据电源电压的瞬时凹陷幅值是否达到预设的幅度、且发生在接触器常开辅助触点或者变频器运行信号接点断开之前，判断接触器或者变频器是否由于晃电原因断开。
后备电源控制电路104，用于根据接触器或者变频器是否由于晃电原因断 开，通过时间继电单元在预设的允许失压时限内控制输出继电器的后备电源开关的闭合或断开。
具体来说，电压检测电路101包括电压继电器及其辅助电路。
优选的，电压检测电路101还用于检测电压瞬时变化量，相应地，逻辑判断电路103还用于根据电压瞬时变化量是否达到预设的斜率、且发生在瞬时凹陷幅值达到预设的幅度之前，判断接触器或者变频器是否由于晃电原因断开。其中预设的幅度取值在控制电源电压的45％～55％之间，优选为控制电源电压的50％，预设的斜率取值10～20％之间，优选为15％。
实施例三
如图3所示为本发明应用于接触器的实例接线原理图，图中，三相线圈L1、L2、L3、三相断路器MCCS、熔断器Fuse、接触器KC和电动机M形成主回路，电动机再起动控制器DZQ-B并联在接触器KC的控制器中，DZQ-B包括8个接点，其中：
第1接点和第2接点：是DZQ-B的逻辑继电单元的电源端子，第1接点连接控制电源的火线L11作为DZQ-B的输入电源；第2接点连接零线，考虑对电子器件的保护，第2接点应可靠接地。该对接点也是检测L11电源电压变化的检测点，采集并检测电源电压瞬时凹陷幅值。
第3接点和第4接点：是DZQ-B的逻辑继电单元的输入端子，接入接触器KC的一对常开点。当接触器KC吸合，则第3接点和第4接点接入的接触器KC常开接点闭合，DZQ-B内部电源被接通，表明接触器KC在吸合状态，电动机正常运行。当第3接点和第4接点断开，则判断接触器KC断开，DZQ-B的逻辑继电单元进一步判断接触器KC是否为电源侧晃电还是正常原因跳开，若不是晃电原因导致，则DZQ-B的后备电源立即解除，若是晃电原因导致，则DZQ-B的后备电源延时解除。
第5接点和第7接点：是DZQ-B的信号输出接点，也是中间信号继电单元的干接点。接触器KC吸合后延时闭合，若接触器因晃电而断开，DZQ-B的逻辑继电单元控制第5接点和第7接点继续闭合，延时打开。若在预设时间内电压恢复，则接触器KC吸合，第5接点和第7接点继续闭合；若在预设时间内电压没有恢复， 则第5接点和第7接点断开。如果接触器不是因晃电而断开，第5接点和第7接点即断开。
第6接点和第8接点：是DZQ-B的输出接点，也是输出继电器常开干接点。
当接触器KC断开瞬间，DZQ-B的逻辑继电单元控制第6接点和第8接点立即闭合，瞬间限时闭锁其运行指令，然后在限时内再进一步判断接触器KC是否由于晃电原因断开。
如果判断接触器KC是由于晃电原因跳开，则第6接点和第8接点继续闭合，延时断开。如果判断接触器KC不是由于晃电原因跳开，说明是正常停车或故障停车，则第6接点和第8接点不执行动作(即断开)，从而不会引起误动作。需要说明的是，该段“限时”的范围不超出国家或国际电气相关规范要求范围。
本实施例中，DZQ-B具有一对输出接点(第6接点和第8接点)和一对与DCS连锁的输出信号接点(第5接点和第7接点)，需要说明的是，第5接点和第7接点根据需要可以没有，也可以有多对。电动机再起动控制器DZQ-B连接在接触器防晃电控制回路，仅当电网瞬时欠压“晃电”时，交流接触器及自保持接点断开后，DZQ-B向接触器提供延时断开的辅助保持，以接触器铁芯线圈吸合电压作为电压阀值判式，当电源恢复后即再闭合，从而维持电动机持续运转。而非晃电原因造成接触器释放，DZQ-B不提供延时断开的辅助保持接点。
实施例四
如图4所示为本发明应用于变频器的实例接线原理图。与实施例三类似，电动机再起动控制器DZQ-BX并联在变频器控制回路，输出两对接点，主输出接点(6-8)用于变频器、继电器的再起动指令重合，实施来电即起，主输出接点只有在变频器正常运行后才被激励，只有在变频器、继电器因电压闪降跳停才发出重合指令，来电重合成功后自动复位。状态信号保持接点(5-7)用于变频器运行信号闭锁，在变频器正常运行后延时闭合，在变频器、继电器因电压闪降跳停后延时释放。状态信号保持接点(5-7)在变频器非电压闪降原因跳停时，立即释放，不予保持。同时为了考虑用于在DCS和PLC信号连锁控制变频器电路中，在逻辑继电单元的控制下提供限时闭锁变频器以及外接的继电器的输出运行状态信号的多对状态信号保持接点。
以上参照附图说明了本发明的优选实施例，并非因此局限本发明的权利范围。本领域技术人员不脱离本发明的范围和实质内所作的任何修改、等同替换和改进，均应在本发明的权利范围之内。
工业实用性
本发明实施例的一种电动机再起动控制器，采用继电电子一体化方式，通过模拟算式和逻辑判式相互闭锁的牺牲判式模糊控制技术，不需要计算机程序或软件即可实现电气逻辑控制，解决对200ms以下的电源瞬时失压快速响应，从而从根本上解决因晃电引起接触器释放的问题，实现了对电压瞬时失压的响应时间达到0秒以上无死区。

Claims (10)

  1. 一种电动机再起动控制器，所述控制器包括用于市电瞬时欠压或失压时对所述控制器进行供电的后备电源单元；以及分别与所述后备电源单元相连的逻辑继电单元、用于预设时限控制的时间继电单元、和用于提供输出接点的输出继电器，其中：
    所述逻辑继电单元，其一对电源端子分别与火线及零线相连，检测电源电压瞬时凹陷幅值，其一对输入端子与接触器常开辅助触点或者变频器运行信号接点相连，检测接触器或者变频器的状态；当检测到接触器常开辅助触点或者变频器运行信号接点断开瞬间，控制输出继电器的输出接点瞬时闭合；如果电源电压的瞬时凹陷幅值达到预设的幅度、且发生在接触器常开辅助触点或者变频器运行信号接点断开之前，则通过时间继电单元在预设的允许失压时限内控制输出继电器的后备电源开关的断开或闭合来控制输出接点动作方式为：在允许失压时限内，瞬时闭合，延时断开。
  2. 根据权利要求1所述的控制器，其中，所述逻辑继电单元包括电压检测电路、接触器状态检测电路、逻辑判断电路和后备电源控制电路，其中：
    所述电压检测电路，输入端与控制电源的火线及零线相连，检测电源电压瞬时凹陷幅值，输出给所述逻辑判断电路；
    所述接触器状态检测电路，输入端与接触器常开辅助触点或者变频器运行信号接点相连，检测接触器常开辅助触点或者变频器运行信号接点的状态，输出给所述逻辑判断电路；
    所述逻辑判断电路，根据电源电压的瞬时凹陷幅值是否达到预设的幅度、且发生在接触器常开辅助触点或者变频器运行信号接点断开之前，判断所述接触器或者变频器是否由于晃电原因断开；
    所述后备电源控制电路，用于根据接触器或者变频器是否由于晃电原因断开，通过所述时间继电单元在预设的允许失压时限内,控制所述输出继电器的后备电源开关的闭合或断开。
  3. 根据权利要求2所述的控制器，其中，所述电压检测电路包括电压继电器及其辅助电路。
  4. 根据权利要求2所述的控制器，其中，所述电压检测电路还用于检测电压瞬时变化量，相应地，所述逻辑判断电路还用于根据所述电压瞬时变化量是否达到预设的斜率、且发生在瞬时凹陷幅值达到预设的幅度之前，判断接触器或者变频器是否由于晃电原因断开。
  5. 根据权利要求4所述的控制器，其中，所述预设的幅度为控制电源电压的45％～55％，所述预设的斜率为10～20％。
  6. 根据权利要求1所述的控制器，其中，所述时间继电单元包括至少在出厂时固化或者通过数显装置固化时间参数的时间继电电路；所述时间参数包括所述预设的允许失压时限。
  7. 根据权利要求6所述的控制器，其中，所述预设的允许失压时限为500毫秒。
  8. 根据权利要求1所述的控制器，其中，所述后备电源单元包括内置的电容、第一开关控制电路和第二开关控制电路，所述第一开关控制电路用于控制是否给控制器供电，第二开关控制电路用于控制是否给所述输出继电器供电。
  9. 根据权利要求8所述的控制器，其中，所述电容为超级电容。
  10. 根据权利要求1-9任意一项权利要求所述的控制器，其中，所述控制器还包括中间信号继电单元，与后备电源单元相连，用于在DCS和PLC信号连锁控制电路中，在所述逻辑继电单元的控制下提供限时闭锁所述接触器或者变频器以及外接的继电器的输出运行状态信号的至少一对状态信号保持接点。
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