CN113937729B - A residual current protection device and distribution box - Google Patents

A residual current protection device and distribution box Download PDF

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CN113937729B
CN113937729B CN202010609876.1A CN202010609876A CN113937729B CN 113937729 B CN113937729 B CN 113937729B CN 202010609876 A CN202010609876 A CN 202010609876A CN 113937729 B CN113937729 B CN 113937729B
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circuit
residual current
yoke
protection device
coil
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CN113937729A (en
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刘清颖
徐水
牛峰
李奎
罗晨
李常宇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The application provides a residual current protection device and a distribution box to reduce the influence of an over-energy interference signal and improve the working reliability of the residual current protection device. The residual current protection device comprises a current transformer, a circuit module and a release, wherein the circuit module comprises a rectification circuit, an anti-interference circuit and a residual current judgment circuit, wherein: the rectifying circuit is connected with the secondary side of the current transformer; the anti-interference circuit is connected with the output end of the rectifying circuit and the tripper and is used for receiving a first electric signal output by the rectifying circuit, controlling the tripper to be closed when the voltage value of the first electric signal is greater than or equal to a first preset threshold value, and outputting the first electric signal to the residual current judging circuit when the voltage value of the first electric signal is less than the first preset threshold value; the residual current judging circuit is connected with the output end of the anti-interference circuit and the tripper and is used for controlling the tripper to be disconnected when the current flowing into the residual current judging circuit meets the preset condition.

Description

一种剩余电流保护装置及配电盒A residual current protection device and distribution box

技术领域technical field

本申请涉及电子电力技术领域，尤其涉及到一种剩余电流保护装置及配电盒。The present application relates to the technical field of electronic power, in particular to a residual current protection device and a power distribution box.

背景技术Background technique

在供配电系统中，为了保证供电安全或者配电安全，一般会在系统的供电路径上设置保护电路，用于保护系统中器件的安全，以剩余电流保护装置(residual currentdevice，RCD)为例，该剩余电流保护装置可用于检测供电路经上的剩余电流，当检测到剩余电流超出规定值时，则确定系统发生漏电现象，断开供电路径，实现保护负载和系统器件的安全的目的。然而现有的一些剩余电流保护装置，较易受到由于雷击产生的过能电流的影响而误动作，将供电路径断开，影响了系统的正常运行。In the power supply and distribution system, in order to ensure the safety of power supply or power distribution, protection circuits are generally set on the power supply path of the system to protect the safety of devices in the system. Take the residual current device (RCD) as an example , the residual current protection device can be used to detect the residual current on the supply circuit. When the residual current is detected to exceed the specified value, it is determined that the system has a leakage phenomenon, and the power supply path is disconnected to achieve the purpose of protecting the safety of the load and system components. However, some existing residual current protection devices are more susceptible to malfunction due to the influence of over-energy current generated by lightning strikes, disconnecting the power supply path, and affecting the normal operation of the system.

发明内容Contents of the invention

本申请提供了一种剩余电流保护装置及配电盒，用以减小过能干扰信号的影响，提高剩余电流保护装置的工作可靠性。The application provides a residual current protection device and a power distribution box, which are used to reduce the influence of over-energy interference signals and improve the working reliability of the residual current protection device.

第一方面，本申请提供了一种剩余电流保护装置，该剩余电流保护装置可包括电流互感器、电路模块以及脱扣器，其中，电流互感器的一次侧可连接在供配电系统的被测线路中，二次侧可与电路模块连接，以将待检测的电流转换后输出给电路模块；电路模块分别与电流互感器的二次侧和脱扣器连接，用于根据接收自电流互感器的信号控制脱扣器的工作状态。具体设置时，电路模块可包括整流电路、抗扰电路及剩余电流判断电路，整流电路与电流互感器的二次侧连接，可用于将电流互感器的二次侧输出的电信号调理后输出；抗扰电路分别与整流电路的输出端和脱扣器连接，可用于接收整流电路输出的第一电信号，并在第一电信号的电压值大于或等于第一预设值时，控制脱扣器保持闭合，以及在第一电信号的电压值小于第一预设阈值时，使第一电信号输出至剩余电流判断电路；剩余电流判断电路分别与抗扰电路的输出端和脱扣器连接，可用于在流入剩余电流判断电路的电流满足预定条件时，控制脱扣器断开。In a first aspect, the present application provides a residual current protection device, which may include a current transformer, a circuit module, and a release, wherein the primary side of the current transformer may be connected to the In the test line, the secondary side can be connected to the circuit module to convert the current to be detected and output to the circuit module; the circuit module is connected to the secondary side of the current transformer and the trip The signal of the release device controls the working state of the release device. During specific configuration, the circuit module may include a rectification circuit, an anti-disturbance circuit and a residual current judgment circuit, the rectification circuit is connected to the secondary side of the current transformer, and can be used to output the electrical signal output from the secondary side of the current transformer after conditioning; The anti-disturbance circuit is respectively connected with the output terminal of the rectification circuit and the release, and can be used to receive the first electrical signal output by the rectification circuit, and control the tripping when the voltage value of the first electrical signal is greater than or equal to the first preset value The device remains closed, and when the voltage value of the first electrical signal is less than the first preset threshold value, the first electrical signal is output to the residual current judging circuit; the residual current judging circuit is respectively connected to the output terminal of the anti-disturbance circuit and the release , which can be used to control the disconnection of the release when the current flowing into the residual current judging circuit meets the predetermined condition.

采用上述剩余电流保护装置对供给配电系统的供电路径进行保护时，在系统遭受雷击致使被测线路上出现过能大电流时，电流互感器的二次侧感应到的电信号的电压值会远大于故障时产生的电压，这时若抗扰电路接收自整流电路输出的第一电信号的电压值大于或者等于第一预设阈值，抗扰电路可将此部分过能作用到脱扣器上，用以增强脱扣器内部磁路的磁场，使脱扣器保持闭合状态；而在系统出现漏电等故障的情况下，由于被测线路上出现的电流较小，因此电流互感器的二次侧感应到的电流和电压也相对较小，此时若抗扰电路接收到的整流电路输出的第一电信号小于第一预设阈值，则可将该第一电信号直接输出给剩余电流判断电路，在剩余电流判断电路确定流入的电流满足相应条件时，控制脱扣器断开，从而切断系统的供电路径，达到保护负载以及系统中相关电器件的安全的目的。可见，本申请提供的剩余电流保护装置既可以实现保护供配电系统安全的目的，又可以减小过能的干扰影响，提高剩余电流保护装置的工作可靠性。When the above-mentioned residual current protection device is used to protect the power supply path of the power distribution system, when the system is struck by lightning and a large over-energy current appears on the line under test, the voltage value of the electrical signal induced by the secondary side of the current transformer will change. Far greater than the voltage generated when the fault occurs. At this time, if the voltage value of the first electrical signal output by the rectification circuit received by the anti-disturbance circuit is greater than or equal to the first preset threshold value, the anti-disturbance circuit can apply this part of the excess energy to the release It is used to enhance the magnetic field of the internal magnetic circuit of the release to keep the release in a closed state; and in the case of a fault such as leakage in the system, because the current on the line under test is small, the two current transformers The current and voltage induced by the secondary side are also relatively small. At this time, if the first electrical signal output by the rectification circuit received by the anti-disturbance circuit is smaller than the first preset threshold, the first electrical signal can be directly output to the residual current The judging circuit, when the residual current judging circuit determines that the inflowing current meets the corresponding conditions, controls the release to disconnect, thereby cutting off the power supply path of the system, and achieving the purpose of protecting the safety of the load and related electrical components in the system. It can be seen that the residual current protection device provided by the present application can not only realize the purpose of protecting the safety of the power supply and distribution system, but also reduce the interference effect of over-energy, and improve the working reliability of the residual current protection device.

在一个具体的实施方案中，脱扣器可包括磁轭、衔铁、永磁体和脱扣线圈，其中，磁轭的一侧具有开口，磁轭的开口侧的两个自由端分别为第一端和第二端；衔铁设置在磁轭的开口侧，且衔铁可铰接在磁轭的第一端，以使得当衔铁绕磁轭的第一端转动时可与磁轭的第二端接触或分离；永磁体可固定设置在磁轭上，永磁体产生的磁场可使磁轭的第二端产生吸附衔铁的磁力，以使得系统在正常工作的情况下，衔铁可与磁轭的第二端保持接触状态，使脱扣器保持闭合；脱扣线圈套设在磁轭的轭铁上，脱扣线圈的两端与剩余电流判断电路的输出端连接，可用于在得电时使磁轭的第二端产生斥离衔铁的磁力，使衔铁与磁轭的第二端分离，将脱扣器由闭合状态切换为断开状态。In a specific embodiment, the release may include a yoke, an armature, a permanent magnet and a tripping coil, wherein one side of the yoke has an opening, and the two free ends on the open side of the yoke are respectively first ends and the second end; the armature is arranged on the open side of the yoke, and the armature can be hinged on the first end of the yoke so that when the armature rotates around the first end of the yoke, it can contact or separate from the second end of the yoke The permanent magnet can be fixedly arranged on the yoke, and the magnetic field generated by the permanent magnet can make the second end of the yoke generate a magnetic force to attract the armature, so that the armature can be kept with the second end of the yoke when the system is working normally. contact state to keep the release closed; the tripping coil is set on the yoke iron of the yoke, and the two ends of the tripping coil are connected to the output end of the residual current judging circuit, which can be used to make the first yoke of the yoke The two ends generate a magnetic force to repel the armature, so that the armature is separated from the second end of the yoke, and the release is switched from the closed state to the open state.

在设置抗扰电路时，抗扰电路具体可包括瞬态抑制二极管和抗扰线圈，瞬态抑制二极管和抗扰线圈可串联设置在整流电路的两个输出端点之间，其中，瞬态抑制二极管可用于在第一电信号的电压值大于或等于第一预设阈值时导通，以使该第一电信号经过抗扰线圈，以及可用于在第一电信号的电压值小于第一预设阈值时，使第一电信号输出至剩余电流判断电路；抗扰线圈套设在磁轭的轭铁上，可用于在得电时使磁轭的第二端产生吸附衔铁的磁力。When setting up the anti-jamming circuit, the anti-jamming circuit may specifically include a TVS diode and an anti-jamming coil, and the TVS diode and the anti-jamming coil may be arranged in series between the two output terminals of the rectifier circuit, wherein the TVS diode It can be used to turn on when the voltage value of the first electrical signal is greater than or equal to the first preset threshold, so that the first electrical signal passes through the anti-disturbance coil, and can be used when the voltage value of the first electrical signal is less than the first preset threshold. When the threshold is reached, the first electric signal is output to the residual current judging circuit; the anti-disturbance coil is sleeved on the yoke of the yoke, and can be used to make the second end of the yoke generate a magnetic force to attract the armature when energized.

采用上述电路结构，当第一电信号的电压值不小于第一预设阈值时，可将瞬态抑制二极管导通，使得第一电信号经过抗扰线圈，抗扰线圈得电后会产生与永磁体产生的磁场方向相同的磁场，因此可增强脱扣器内部磁路的磁场，使衔铁牢靠地吸附在磁轭的第二端，避免脱扣器误动作；当第一电信号的电压值小于第一预设阈值时，该电压值不足以使瞬态抑制二极管导通，这时第一电信号可直接输出至剩余电流判断电路，由剩余电流判断电路决定脱扣器是否动作。由此可见该方案既可以实现保护供配电系统安全的目的，又可以减小过能的干扰影响，提高剩余电流保护装置的工作可靠性。With the above circuit structure, when the voltage value of the first electrical signal is not less than the first preset threshold value, the transient suppression diode can be turned on, so that the first electrical signal passes through the anti-disturbance coil, and the anti-disturbance coil will generate electricity after the anti-disturbance coil is energized. The magnetic field generated by the permanent magnet has the same magnetic field direction, so the magnetic field of the internal magnetic circuit of the release can be enhanced, so that the armature is firmly adsorbed on the second end of the yoke, and the malfunction of the release is avoided; when the voltage value of the first electrical signal When the voltage is less than the first preset threshold, the voltage value is not enough to turn on the transient suppression diode. At this time, the first electrical signal can be directly output to the residual current judging circuit, and the residual current judging circuit determines whether the tripper operates. It can be seen that this scheme can not only realize the purpose of protecting the safety of the power supply and distribution system, but also reduce the interference effect of over-energy, and improve the working reliability of the residual current protection device.

在一个可能的实施方案中，抗扰线圈可与剩余电流判断电路并联设置在电路模块中。具体设计时，抗扰线圈的一端与整流电路的第一输出端点以及剩余电流判断电路的第一输入端点连接，另一端与瞬态抑制二极管的一端连接，瞬态抑制二极管的另一端则与整流电路的第二输出端点及剩余电流判断电路的第二输入端点连接。该方案中，抗扰线圈与瞬态抑制二极管位于同一支路上，在瞬态抑制二极管截止的状态下，抗扰线圈上没有电流经过，因此在系统故障时不会对脱扣器的内部磁路产生影响，可以提高剩余电流保护装置的工作可靠性。In a possible implementation, the anti-disturbance coil can be arranged in the circuit module in parallel with the residual current judging circuit. In specific design, one end of the anti-disturbance coil is connected to the first output terminal of the rectifier circuit and the first input terminal of the residual current judgment circuit, the other end is connected to one end of the transient suppression diode, and the other end of the transient suppression diode is connected to the rectifier The second output terminal of the circuit is connected with the second input terminal of the residual current judging circuit. In this scheme, the anti-disturbance coil and the transient suppression diode are located on the same branch. When the transient suppression diode is cut off, no current flows through the anti-disturbance coil, so the internal magnetic circuit of the release will not be affected when the system fails. It can improve the working reliability of the residual current protection device.

在另一个可能的实施方案中，抗扰线圈还可与剩余电流判断电路串联设置在电路模块中。具体设计时，抗扰线圈的一端与整流电路的第一输出端点连接，另一端与瞬态抑制二极管的一端以及剩余电流判断电路的第一输入端点连接，瞬态抑制二极管的另一端则分别与整流电路的第二输出端点以及剩余电流判断电路的第二输入端点连接。采用这种设计，当系统出现漏电故障时，尽管整流电路输出的第一电信号会经过抗扰线圈，但是由于该第一电信号的电流值相对较小，因此抗扰线圈所产生的磁场强度要远小于脱扣线圈得电时产生的磁场强度，因此也不会对脱扣器的动作产生影响。In another possible implementation, the anti-disturbance coil can also be arranged in series with the residual current judging circuit in the circuit module. During specific design, one end of the anti-disturbance coil is connected to the first output terminal of the rectifier circuit, the other end is connected to one end of the transient suppression diode and the first input terminal of the residual current judgment circuit, and the other end of the transient suppression diode is connected to the first input terminal of the residual current judgment circuit respectively. The second output terminal of the rectification circuit is connected to the second input terminal of the residual current judging circuit. With this design, when a leakage fault occurs in the system, although the first electrical signal output by the rectifier circuit will pass through the anti-disturbance coil, the current value of the first electrical signal is relatively small, so the magnetic field strength generated by the anti-disturbance coil It should be much smaller than the magnetic field strength generated when the tripping coil is energized, so it will not affect the action of the tripper.

在设置抗扰线圈时，具体可将抗扰线圈与脱扣线圈以相反的缠绕方向叠加缠绕在磁轭的同一轭铁上，这样即可使两者在得电时产生方向相反的磁场。When setting the anti-disturbance coil, specifically, the anti-disturbance coil and the tripping coil can be superimposed and wound on the same yoke of the magnetic yoke in opposite winding directions, so that the two can generate magnetic fields in opposite directions when they are energized.

为了提高脱扣器的工作可靠性，在一些可能的实施方案中，脱扣器开和包括弹性件，具体设置时，该弹性件的一端可与磁轭连接，另一端则与衔铁铰接在磁轭的第一端的一侧连接，当衔铁与磁轭的第二端接触时，弹性件处于被拉伸的蓄能状态；当脱扣线圈得电使衔铁与磁轭的第二端分离时，弹性件逐渐由蓄能状态变为释能状态，因此可施加给衔铁一定的拉力作用，该拉力可增大使衔铁顺时针转动的扭矩，保证衔铁的转动行程，以使其能够可靠地将供电路径切断。In order to improve the working reliability of the tripper, in some possible implementations, the tripper includes an elastic piece. When specifically configured, one end of the elastic piece can be connected with the yoke, and the other end is hinged with the armature on the magnetic yoke. One side of the first end of the yoke is connected, when the armature is in contact with the second end of the yoke, the elastic member is in a state of energy storage being stretched; when the tripping coil is energized, the armature is separated from the second end of the yoke , the elastic member gradually changes from the energy storage state to the energy release state, so a certain pulling force can be applied to the armature, which can increase the torque that makes the armature rotate clockwise and ensure the rotation stroke of the armature so that it can reliably supply Path cut off.

在一个可能的实施方案中，剩余电流判断电路可包括检测器和驱动电路，其中，检测器可与抗扰电路的输出端连接，其作用为在流入剩余电流判断电路的电流值大于或等于第二预设阈值时，向驱动电路发出驱动信号；驱动电路分别与检测器和抗扰线圈连接，其作用为在接收到驱动信号时，将驱动信号的功率进行放大以生成控制信号，并将控制信号发送给脱扣线圈，使脱扣线圈得电，进而控制脱扣器断开。In a possible implementation, the residual current judging circuit may include a detector and a driving circuit, wherein the detector may be connected to the output terminal of the anti-disturbance circuit, and its function is that when the current value flowing into the residual current judging circuit is greater than or equal to the first When the second preset threshold is reached, a driving signal is sent to the driving circuit; the driving circuit is respectively connected with the detector and the anti-disturbance coil, and its function is to amplify the power of the driving signal to generate a control signal when receiving the driving signal, and control the The signal is sent to the tripping coil, so that the tripping coil is energized, and then the release is controlled to be disconnected.

具体设置时，检测器可包括检测芯片、第一电容和第一电阻，第一电阻的一端为剩余电流保护电路的第一输入端点，第一电阻的另一端与第一电容的一端以及检测芯片的第一输入端连接，第一电容的另一端为剩余电流判断电路的第二输入端点；检测芯片的第二输入端与参考电源连接，检测芯片的输出端则与驱动电路连接；During specific setting, the detector may include a detection chip, a first capacitor and a first resistor, one end of the first resistor is the first input terminal of the residual current protection circuit, the other end of the first resistor and one end of the first capacitor and the detection chip The first input terminal of the first capacitor is connected, and the other end of the first capacitor is the second input terminal of the residual current judgment circuit; the second input terminal of the detection chip is connected with the reference power supply, and the output terminal of the detection chip is connected with the drive circuit;

驱动电路可包括第二电阻、第三电阻、第四电阻、第五电阻、第五二极管、第二电容和NPN型三极管。其中，第二电阻的第一端与第五二极管的阳极以及检测芯片的输出端连接，第二电阻的第二端与检测芯片的第二输入端以及第三电阻的第二端连接；第五二极管的阴极与第三电阻的第一端以及第四电阻的第一端连接；第四电阻的第二端与第二电容的第一端以及第五电阻的第一端连接；NPN型三极管的发射极与脱扣线圈连接，NPN型三极管的基极与第五电阻的第二端连接，NPN型三极管的集电极与第二电容的第二端连接。The driving circuit may include a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fifth diode, a second capacitor and an NPN transistor. Wherein, the first end of the second resistor is connected to the anode of the fifth diode and the output end of the detection chip, and the second end of the second resistor is connected to the second input end of the detection chip and the second end of the third resistor; The cathode of the fifth diode is connected to the first end of the third resistor and the first end of the fourth resistor; the second end of the fourth resistor is connected to the first end of the second capacitor and the first end of the fifth resistor; The emitter of the NPN transistor is connected to the tripping coil, the base of the NPN transistor is connected to the second end of the fifth resistor, and the collector of the NPN transistor is connected to the second end of the second capacitor.

采用上述电路结构，当电流流入剩余电流判断电路时可向第一电容充电，若流入剩余电流判断电路的电流值大于或等于第二预设阈值，使得第一电容的电压值大于参考电源电压时，检测芯片可输出高压驱动信号，驱动电流接收到该驱动信号后对可对其进行放大并生成控制信号，进而通过该控制信号驱动NPN型三极管导通，使脱扣线圈得电，将脱扣器由闭合状态切换为断开状态，切断系统的供电路径，避免由于漏电故障损坏负载以及相关电器件。With the above circuit structure, when the current flows into the residual current judging circuit, the first capacitor can be charged, if the current value flowing into the residual current judging circuit is greater than or equal to the second preset threshold, so that the voltage value of the first capacitor is greater than the reference power supply voltage , the detection chip can output a high-voltage driving signal. After receiving the driving signal, the driving current can amplify it and generate a control signal, and then drive the NPN transistor to conduct through the control signal, so that the tripping coil is energized and the tripping Switch from the closed state to the open state, cut off the power supply path of the system, and avoid damage to the load and related electrical components due to leakage faults.

为了减小电流互感器的二次侧输出的电信号的波动，电流互感器的二次侧与整流电路之间还可设置有稳压电路，该稳压电路包括第六电阻和第三电容，其中，第六电阻的第一端与电流互感器的二次侧的一端连接，第六电阻的第二端与电流互感器的二次侧的另一端连接，第三电容的第一端与第六电阻的第一端连接，第三电容的第二端与第六电阻的第二端连接。In order to reduce the fluctuation of the electrical signal output by the secondary side of the current transformer, a voltage stabilizing circuit may also be arranged between the secondary side of the current transformer and the rectification circuit, and the voltage stabilizing circuit includes a sixth resistor and a third capacitor, Wherein, the first end of the sixth resistor is connected to one end of the secondary side of the current transformer, the second end of the sixth resistor is connected to the other end of the secondary side of the current transformer, and the first end of the third capacitor is connected to the second end of the second capacitor. The first ends of the six resistors are connected, and the second end of the third capacitor is connected with the second end of the sixth resistor.

第二方面，本申请还提供了一种配电盒，该配电盒可应用在无线大功率5G基站或者家庭电路等多种场景的供配电系统中，包括盒体以及前述任一可能的实施方案中的剩余电流保护装置，其中，盒体上设置有导轨，剩余电流保护装置可卡接在该导轨内，剩余电流保护装置的电流互感器一次侧可与供配电系统的供电线路连接，以检测系统的供电线路上是否有故障电流。In the second aspect, the present application also provides a power distribution box, which can be used in power supply and distribution systems in various scenarios such as wireless high-power 5G base stations or home circuits, including the box body and any of the aforementioned possible The residual current protection device in the embodiment, wherein the box body is provided with a guide rail, the residual current protection device can be snapped into the guide rail, and the primary side of the current transformer of the residual current protection device can be connected to the power supply line of the power supply and distribution system , to detect whether there is a fault current on the power supply line of the system.

附图说明Description of drawings

图1为现有的一种剩余电流保护装置的结构示意图；Fig. 1 is a structural schematic diagram of an existing residual current protection device;

图2为本申请提供的剩余电流保护装置的结构示意图；Fig. 2 is a schematic structural diagram of the residual current protection device provided by the present application;

图3为本申请实施例提供的脱扣器的结构示意图；FIG. 3 is a schematic structural diagram of a release provided in an embodiment of the present application;

图4为本申请实施例提供的一种电路模块的结构示意图；FIG. 4 is a schematic structural diagram of a circuit module provided in an embodiment of the present application;

图5为本申请实施例提供的另一种电路模块的结构示意图；FIG. 5 is a schematic structural diagram of another circuit module provided in an embodiment of the present application;

图6为本申请实施例提供的配电盒的结构示意图。FIG. 6 is a schematic structural diagram of a power distribution box provided by an embodiment of the present application.

附图标记：Reference signs:

1-剩余电流保护装置；100-电路模块；200-脱扣器；10-整流电路；20-抗扰电路；1-residual current protection device; 100-circuit module; 200-release unit; 10-rectifier circuit; 20-anti-disturbance circuit;

30-剩余电流判断电路；40-磁轭；50-衔铁；60-永磁体；41-磁轭的第一端；30-residual current judgment circuit; 40-yoke; 50-armature; 60-permanent magnet; 41-the first end of the yoke;

42-磁轭的第二端；70-弹性件；2-配电盒。42-the second end of the yoke; 70-elastic part; 2-distribution box.

具体实施方式Detailed ways

为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings.

为了方便理解本申请实施例提供的剩余电流保护装置，下面首先说明一下其应用场景。本申请实施例提供的剩余电流保护装置可以应用于供电系统或者配电系统中，用于检测系统是否发生故障(例如漏电故障)，在确定系统发生故障时，断开系统供电路径的连接，以实现保护负载以及系统中相关电器件的安全的目的。In order to facilitate the understanding of the residual current protection device provided by the embodiment of the present application, its application scenario is firstly described below. The residual current protection device provided by the embodiment of the present application can be applied to a power supply system or a power distribution system to detect whether a fault occurs in the system (such as a leakage fault), and when it is determined that a fault occurs in the system, the connection of the power supply path of the system is disconnected, so as to To achieve the purpose of protecting the safety of loads and related electrical devices in the system.

图1为现有技术中一种可能的剩余电流保护装置的结构示意图，该剩余电流保护装置包括电流互感器、判断电路01和脱扣器，其中，电流互感器可实时检测供电路径的剩余电流，并将检测的电流转换后输出给判别电路01，当判断电路01接收的电流大于某一阈值时，可向脱扣器发送驱动信号，将脱扣器由闭合状态切换为断开状态，进而将系统的供电路径切断，而当判断电路01接收的电流不大于上述阈值时，则不会向脱扣器发送驱动信号，使脱扣器保持闭合状态，此时系统可正常进行电力输送。该剩余电流保护装置虽然能够在漏电故障中保护负载及系统中电器件的安全，但是在其使用过程中，若系统遭受雷击，供电路径上会出现较大的过能电流，这时，电流互感器的二次侧也会感应到较大电流和较高电压，极易导致判断电路误判定为漏电故障而控制脱扣器动作，将供电路径切断，严重时甚至会直接破坏电器件，导致剩余电流保护装置损坏。需要说明的是，本申请中的过能可理解为过量的能量，包括但不限于：过电压所对应的能量(例如，浪涌电压和冲击电压等形成的能量)和过电流所对应的能量(例如，浪涌电流和冲击电流等所形成的能量)。Fig. 1 is a schematic structural diagram of a possible residual current protection device in the prior art, the residual current protection device includes a current transformer, a judgment circuit 01 and a release, wherein the current transformer can detect the residual current of the power supply path in real time , and convert the detected current and output it to the discrimination circuit 01. When the current received by the judgment circuit 01 is greater than a certain threshold, a drive signal can be sent to the release to switch the release from the closed state to the open state, and then Cut off the power supply path of the system, and when the current received by the judging circuit 01 is not greater than the above threshold, no driving signal will be sent to the trip unit, so that the trip unit remains closed, and the system can normally carry out power transmission. Although the residual current protection device can protect the safety of loads and electrical components in the system during leakage faults, if the system is struck by lightning during its use, a large over-energy current will appear on the power supply path. At this time, the current mutual inductance The secondary side of the device will also sense a large current and high voltage, which can easily cause the judgment circuit to misjudge the leakage fault and control the action of the release to cut off the power supply path. The current protection device is damaged. It should be noted that excess energy in this application can be understood as excess energy, including but not limited to: energy corresponding to overvoltage (for example, energy formed by surge voltage and impact voltage) and energy corresponding to overcurrent (For example, the energy formed by surge current and inrush current, etc.).

为解决上述问题，现有技术中的一种方案是使用铁磁材料进行电磁屏蔽，以此来减小过能电流对脱扣器产生的干扰磁场的影响，进而减小脱扣器误动作的风险，但是这种设计只对强度较小的干扰磁场有效果，过能电流产生的强干扰磁场易使铁磁材料进入饱和状态，屏蔽效能下降，因此仍然会导致脱扣器误动作；另一种方案是在过能电流作用时，采用压敏电阻等元件对电流互感器感应出的高电压、大电流进行抑制，但是由于压敏电阻等仅能对电路器件进行保护，因此该方案也不能解决由于电子电路误判导致的脱扣器误动作的问题。In order to solve the above problems, one solution in the prior art is to use ferromagnetic materials for electromagnetic shielding, so as to reduce the influence of over-energy current on the interference magnetic field generated by the release, thereby reducing the risk of malfunction of the release. Risk, but this design is only effective for interference magnetic fields with low strength. The strong interference magnetic field generated by the over-energy current will easily cause the ferromagnetic material to enter a saturated state, and the shielding efficiency will decrease, so it will still cause the release to malfunction; another The first solution is to use components such as varistors to suppress the high voltage and large current induced by the current transformer when the over-energy current acts. However, since the varistors can only protect circuit devices, this solution cannot Solve the problem of trip unit misoperation caused by electronic circuit misjudgment.

基于此，本申请实施例提供了一种剩余电流保护装置，该剩余电流保护装置可将过能电流通过电流互感器传递到电路模块的能量，用来增强脱扣器内部磁路的磁场强度，从而减小过能电流对脱扣器的磁场干扰，提高剩余电流保护装置的工作可靠性。下面结合附图对本申请实施例提供的剩余电流保护装置进行具体说明。Based on this, the embodiment of the present application provides a residual current protection device, which can transmit the energy of the over-energy current to the circuit module through the current transformer, so as to enhance the magnetic field strength of the internal magnetic circuit of the release, Therefore, the interference of the over-energy current to the magnetic field of the release is reduced, and the working reliability of the residual current protection device is improved. The residual current protection device provided by the embodiment of the present application will be specifically described below with reference to the accompanying drawings.

以下实施例中所使用的术语只是为了描述特定实施例的目的，而并非旨在作为对本申请的限制。如本申请中所涉及的多个，是指两个或两个以上。本申请中所涉及术语“连接”，描述两个对象的连接关系，可以表示两种连接关系，例如，A和B连接，可以表示：A与B直接连接，A通过C和B连接这两种情况。另外，需要理解的是，在本申请的描述中，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。The terms used in the following examples are for the purpose of describing particular examples only, and are not intended to limit the application. A plurality as mentioned in this application refers to two or more than two. The term "connection" involved in this application describes the connection relationship between two objects, and can represent two connection relationships. Condition. In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or imply order.

首先参考图2所示，图2为本申请提供的剩余电流保护装置的结构示意图。本申请实施例提供的剩余电流保护装置1可包括电流互感器、电路模块100和脱扣器200，其中，电流互感器的一次侧可串联在供配电系统的被测线路中，二次侧则可与电路模块100连接，以将检测的电流转换后输出给电路模块100；电路模块100分别与电流互感器的二次侧和脱扣器200连接，用于对接收自电流互感器的二次侧的电信号进行处理，并根据处理后的电信号控制脱扣器200断开或保持闭合。Referring first to FIG. 2 , FIG. 2 is a schematic structural diagram of a residual current protection device provided by the present application. The residual current protection device 1 provided in the embodiment of the present application may include a current transformer, a circuit module 100 and a release 200, wherein the primary side of the current transformer can be connected in series in the tested circuit of the power supply and distribution system, and the secondary side Then it can be connected with the circuit module 100 to output the detected current to the circuit module 100; The electrical signal on the secondary side is processed, and the release 200 is controlled to open or remain closed according to the processed electrical signal.

具体实施时，电路模块100可包括整流电路10、抗扰电路20和剩余电流判断电路30，其中，整流电路10与电流互感器的二次侧连接，用于将电流互感器的二次侧输出的电信号转换为直流电能后输出；抗扰电路20分别与整流电路10的输出端和脱扣器200连接，可用于接收整流电路10输出的第一电信号，并在第一电信号的电压值大于或等于第一预设阈值时，控制脱扣器200保持闭合状态，以及在第一电信号的电压值小于第一预设阈值时，将第一电信号输出给剩余电流判断电路30；剩余电流判断电路30分别与抗扰电路20的输出端和脱扣器200连接，可用于在流入剩余电流判断电路30的电流满足预定条件时，控制脱扣器200断开。During specific implementation, the circuit module 100 may include a rectification circuit 10, an anti-disturbance circuit 20 and a residual current judgment circuit 30, wherein the rectification circuit 10 is connected to the secondary side of the current transformer for outputting the secondary side of the current transformer The electrical signal of the rectification circuit 10 is converted into the output after the direct current electric energy; The anti-disturbance circuit 20 is respectively connected with the output terminal of the rectification circuit 10 and the release 200, and can be used to receive the first electrical signal output by the rectification circuit 10, and the voltage of the first electrical signal When the value is greater than or equal to the first preset threshold, the control release 200 remains closed, and when the voltage value of the first electrical signal is less than the first preset threshold, the first electrical signal is output to the residual current judging circuit 30; The residual current judging circuit 30 is connected to the output terminal of the anti-disturbance circuit 20 and the trip unit 200 respectively, and can be used to control the trip unit 200 to disconnect when the current flowing into the residual current judging circuit 30 satisfies a predetermined condition.

利用上述剩余电流保护装置1对供配电系统进行保护时，在系统遭受雷击的情况下，被测线路中的电流发生突增，此时电流互感器的二次侧会感应到较大的电流和较高的电压，抗扰电路20接收到的整流电路10输出的第一电信号的电压值也相对较大，当该第一电信号的电压值大于或者等于第一预设阈值时，抗扰电路20可将此部分过能作用到脱扣器200上，用以增强脱扣器200内部磁路的磁场，使脱扣器200保持闭合状态；而在系统出现漏电等故障的情况下，由于被测线路上出现的电流较小，因此电流互感器的二次侧感应到的电流和电压也相对较小，此时若抗扰电路20接收到的整流电路10输出的第一电信号小于第一预设阈值，则可将该第一电信号直接输出给剩余电流判断电路30，在剩余电流判断电路30确定流入的电流满足相应条件时，控制脱扣器200断开，从而切断系统的供电路径，达到保护负载以及系统中相关电器件的安全的目的。由此可见，本申请实施例提供的剩余电流保护装置1既可以实现保护供配电系统安全的目的，又可以减小过能的干扰影响，提高剩余电流保护装置的工作可靠性。When the above-mentioned residual current protection device 1 is used to protect the power supply and distribution system, when the system is struck by lightning, the current in the line under test will suddenly increase, and at this time, the secondary side of the current transformer will induce a relatively large current and higher voltage, the voltage value of the first electrical signal output by the rectification circuit 10 received by the anti-disturbance circuit 20 is also relatively large, when the voltage value of the first electrical signal is greater than or equal to the first preset threshold value, the anti-disturbance Disturbance circuit 20 can use this part of the excess energy to act on the release 200 to enhance the magnetic field of the internal magnetic circuit of the release 200 to keep the release 200 in a closed state; Since the current on the line under test is relatively small, the current and voltage induced by the secondary side of the current transformer are also relatively small. The first preset threshold value, then the first electrical signal can be directly output to the residual current judging circuit 30, and when the residual current judging circuit 30 determines that the inflowing current meets the corresponding conditions, the release 200 is controlled to be disconnected, thereby cutting off the system. The power supply path achieves the purpose of protecting the safety of the load and related electrical components in the system. It can be seen that the residual current protection device 1 provided by the embodiment of the present application can not only realize the purpose of protecting the safety of the power supply and distribution system, but also reduce the interference effect of over-energy, and improve the working reliability of the residual current protection device.

图3为本申请实施例提供的脱扣器的结构示意图。在本申请实施例中，脱扣器200可包括磁轭40、衔铁50、永磁体60以及脱扣线圈L脱，其中，磁轭40的一侧具有开口，具体实施时，该磁轭40可设置为近似U形的结构，磁轭40的开口侧包括两个自由端，分别为第一端41和第二端42；衔铁50设置在磁轭40的开口侧，且衔铁50可与磁轭40的第一端41铰接设置，当衔铁50绕磁轭40的第一端41转动时可与磁轭40的第二端42接触或分离，从而使脱扣器200闭合或断开；永磁体60可设置在磁轭40上，且永磁体60产生的磁场可使磁轭40的第二端42产生吸附衔铁50的磁力，以使得在系统正常工作的情况下，衔铁50可与磁轭40的第二端42保持接触状态，即可以使脱扣器200保持闭合；脱扣线圈L脱可套设在磁轭40的轭铁上，脱扣线圈L脱的两端分别与前述剩余电流判断电路连接，用于在得电时产生与永磁体60产生的磁场方向相反的磁场，这时磁轭40的第二端42可产生斥离衔铁50的磁力，使衔铁50与磁轭40的第二端42分离，将脱扣器200由闭合状态切换为断开状态。Fig. 3 is a schematic structural diagram of a release provided in an embodiment of the present application. In the embodiment of the present application, the release 200 may include a yoke 40, an armature 50, a permanent magnet 60, and a tripping coil L, wherein one side of the yoke 40 has an opening. In specific implementation, the yoke 40 may be Set as an approximately U-shaped structure, the open side of the yoke 40 includes two free ends, respectively the first end 41 and the second end 42; the armature 50 is arranged on the open side of the yoke 40, and the armature 50 can be connected with the yoke The first end 41 of 40 is hingedly arranged, and when the armature 50 rotates around the first end 41 of the yoke 40, it can contact or separate from the second end 42 of the yoke 40, so that the release 200 is closed or disconnected; the permanent magnet 60 can be arranged on the yoke 40, and the magnetic field generated by the permanent magnet 60 can make the second end 42 of the yoke 40 generate a magnetic force to attract the armature 50, so that the armature 50 can be connected to the yoke 40 when the system works normally. The second end 42 of the second end 42 of the yoke is kept in contact, so that the release 200 can be kept closed; the tripping coil L can be sleeved on the yoke of the yoke 40, and the two ends of the tripping coil L can be judged respectively with the aforementioned residual current. The circuit connection is used to generate a magnetic field opposite to the direction of the magnetic field generated by the permanent magnet 60 when energized. At this time, the second end 42 of the yoke 40 can generate a magnetic force that repels the armature 50, so that the armature 50 and the first end of the yoke 40 The two ends 42 are separated to switch the release 200 from the closed state to the open state.

需要说明的是，脱扣线圈L脱在得电时产生的磁场强度需要大于永磁体60产生的磁场强度，即永磁体60使磁轭40的第二端42产生的吸附作用力要大于脱扣线圈L脱使磁轭40的第二端42产生的斥离作用力，以保证系统出现漏电故障时衔铁50能够克服永磁体60的磁场作用，顺利与磁轭40的第二端42分离。可以理解的，脱扣线圈L脱在得电时产生的磁场强度可通过脱扣线圈L脱的匝数、以及剩余电流判断电路向脱扣线圈L脱发送的驱动信号的大小等参数确定，具体实施时可根据所使用的永磁体60来设计剩余电流判断电路以及脱扣线圈L脱，此处不再详述。It should be noted that the magnetic field strength generated by the tripping coil L when it is energized needs to be greater than the magnetic field strength generated by the permanent magnet 60, that is, the permanent magnet 60 makes the adsorption force generated by the second end 42 of the yoke 40 greater than that of the tripping coil L. The coil L releases the repelling force generated by the second end 42 of the yoke 40 to ensure that the armature 50 can overcome the magnetic field effect of the permanent magnet 60 and separate from the second end 42 of the yoke 40 smoothly when a leakage fault occurs in the system. It can be understood that the magnetic field strength generated by the trip coil L when it is energized can be determined by parameters such as the number of turns of the trip coil L and the size of the drive signal sent by the residual current judgment circuit to the trip coil L. During implementation, the residual current judging circuit and the tripping coil L can be designed according to the permanent magnet 60 used, which will not be described in detail here.

如前所述，脱扣器200在工作时，当衔铁50与磁轭40的第二端42接触时，脱扣器200为闭合状态，供配电系统可正常进行电力输送，而当衔铁50与磁轭40的第二端42分离时，脱扣器200为断开状态，这时可以将供配电系统的供电路径切断。具体实施时，剩余电流保护装置还可包括一套操作结构，该操作机构可设置在脱扣器200的一侧，且操作机构的一端设置有与受电线路连接的动触点，供电线路上则设置有与该动触点配合的静触点，当系统正常工作时，动触点可在操作机构的控制下与静触点接触，使供电路径导通，而当系统出现漏电等故障时，脱扣器200断开，衔铁50的一端在磁场作用下朝向远离磁轭40的第二端42的方向转动(即图3中的顺时针方向)，并触碰到操作机构，使操作机构控制动触点与静触点分离，继而将供电路径切断。其中，操作机构的具体结构及传动方式等可参考现有的一些断路器的设计，在此不再赘述。As mentioned above, when the release 200 is working, when the armature 50 is in contact with the second end 42 of the yoke 40, the release 200 is in the closed state, and the power supply and distribution system can normally carry out power transmission, and when the armature 50 When separated from the second end 42 of the yoke 40, the release 200 is in an off state, and at this time, the power supply path of the power supply and distribution system can be cut off. During specific implementation, the residual current protection device can also include a set of operating structure. The operating mechanism can be arranged on one side of the release 200, and one end of the operating mechanism is provided with a movable contact connected to the power receiving line. Then there is a static contact that cooperates with the moving contact. When the system is working normally, the moving contact can contact the static contact under the control of the operating mechanism to make the power supply path conduction. When the system has a fault such as leakage , the release 200 is disconnected, and one end of the armature 50 rotates toward the direction away from the second end 42 of the yoke 40 under the action of the magnetic field (that is, the clockwise direction in FIG. 3 ), and touches the operating mechanism, so that the operating mechanism The control moving contact is separated from the static contact, and then the power supply path is cut off. Wherein, the specific structure and transmission mode of the operating mechanism can refer to the designs of some existing circuit breakers, and will not be repeated here.

继续参考图3所示，为了提高脱扣器200的工作可靠性，在本申请的一些实施例中，脱扣器200还可包括弹性件70，该弹性件70的一端可与磁轭40连接，具体设置时，当永磁体60设置在磁轭40上靠近其第一端41的一侧时，弹性件70还可以连接在永磁体60上，以降低其安装难度；弹性件70的另一端则与衔铁50铰接在磁轭40的第一端41的一侧连接，当衔铁50与磁轭40的第二端42接触时，弹性件70处于被拉伸的蓄能状态，衔铁50可在永磁体60产生的磁场作用下克服弹性件70的拉力，与磁轭40的第二端42保持接触，此时若脱扣线圈L脱得电，衔铁50会在脱扣线圈L脱产生的磁场的作用下顺时针转动并与磁轭40的第二端42分离，在此过程中，弹性件70逐渐由蓄能状态变为释能状态，因此也会施加给衔铁50一定的拉力作用，从而可以增大使衔铁50顺时针转动的扭矩，使衔铁50的端部能够可靠地触碰到操作机构，将供电路径切断。Continuing to refer to FIG. 3 , in order to improve the working reliability of the release 200 , in some embodiments of the present application, the release 200 may further include an elastic member 70 , and one end of the elastic member 70 may be connected to the yoke 40 , when specifically set, when the permanent magnet 60 is arranged on the side of the yoke 40 close to its first end 41, the elastic member 70 can also be connected to the permanent magnet 60 to reduce its installation difficulty; the other end of the elastic member 70 Then, the armature 50 is hinged on the side of the first end 41 of the yoke 40. When the armature 50 contacts the second end 42 of the yoke 40, the elastic member 70 is in a stretched energy storage state, and the armature 50 can be Under the action of the magnetic field generated by the permanent magnet 60, it overcomes the pulling force of the elastic member 70 and keeps in contact with the second end 42 of the yoke 40. At this time, if the tripping coil L is de- energized, the armature 50 will release the magnetic field generated by the tripping coil L. Under the action of clockwise rotation and separated from the second end 42 of the yoke 40, during this process, the elastic member 70 gradually changes from the energy storage state to the energy release state, so it will also exert a certain pulling force on the armature 50, thereby The torque to rotate the armature 50 clockwise can be increased, so that the end of the armature 50 can reliably touch the operating mechanism to cut off the power supply path.

下面分别对电路模块的整流电路、抗扰电路以及剩余电流保护电路的具体结构进行介绍。The specific structures of the rectification circuit, the anti-disturbance circuit and the residual current protection circuit of the circuit module are introduced respectively below.

参考图4所示，图4为本申请实施例提供的一种电路模块的结构示意图。在具体设置整流电路10时，该整流电路10包括第一二极管D1、第二二极管D2、第三二极管D3和第四二极管D4，其中，D1的阳极为整流电路的第一输入端点，D4的阴极为整流电路的第二输入端点，D2的阴极为整流电路的第一输出端点，D4的阳极为整流电路的第二输入端点；D1的阳极与电流互感器的二次侧的一端以及D3的阴极连接，D1的阴极与D2的阴极连接；D4的阳极与D3的阳极连接，D4的阴极与电流互感器的二次侧的另一端以及D2的阳极连接。这样，经过整流电路的调节整流作用，就可将电流互感器的二次侧输出的单相交流电转换为单向直流电输出。Referring to FIG. 4 , FIG. 4 is a schematic structural diagram of a circuit module provided by an embodiment of the present application. When specifically setting the rectifier circuit 10, the rectifier circuit 10 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, wherein the anode of D1 is the anode of the rectifier circuit. The first input terminal, the cathode of D4 is the second input terminal of the rectifier circuit, the cathode of D2 is the first output terminal of the rectifier circuit, the anode of D4 is the second input terminal of the rectifier circuit; the anode of D1 is connected to the two terminals of the current transformer One end of the secondary side is connected to the cathode of D3, the cathode of D1 is connected to the cathode of D2; the anode of D4 is connected to the anode of D3, and the cathode of D4 is connected to the other end of the secondary side of the current transformer and the anode of D2. In this way, the single-phase alternating current output from the secondary side of the current transformer can be converted into a one-way direct current output through the adjustment and rectification function of the rectification circuit.

一并参考图3和图4，抗扰电路20可包括瞬态抑制二极管TVS和抗扰线圈L抗，TVS与抗扰线圈L抗串联设置在整流电路10的两个输出端点之间，其中，TVS可用于在整流电路10输出的第一电信号的电压值大于或等于第一预设阈值(TVS的开启电压)时导通，以使该第一电信号经过抗扰线圈L抗，以及可用于在第一电信号的电压值小于第一预设阈值时，使第一电信号输出至剩余电流判断电路30；抗扰线圈L抗套设在磁轭40的轭铁上，用于在得电时使磁轭40的第二端42产生吸附衔铁50的磁力。具体实施时，抗扰线圈L抗与脱扣线圈L脱可叠加缠绕在磁轭40的同一侧轭铁上，通过将两者的缠绕方向相反设置即可使两者在得电时产生方向相反的磁场。Referring to FIG. 3 and FIG. 4 together, the anti-disturbance circuit 20 may include a transient suppression diode TVS and an anti-disturbance coil L anti- disturbance , and the TVS and the anti-disturbance coil L anti- disturbance are arranged in series between the two output terminals of the rectifier circuit 10, wherein, The TVS can be used to turn on when the voltage value of the first electrical signal output by the rectifier circuit 10 is greater than or equal to the first preset threshold value (the turn-on voltage of the TVS), so that the first electrical signal passes through the anti-disturbance coil L, and can be used When the voltage value of the first electrical signal is less than the first preset threshold, the first electrical signal is output to the residual current judging circuit 30; the anti-disturbance coil L is sleeved on the yoke of the yoke 40 for obtaining When powered on, the second end 42 of the yoke 40 generates a magnetic force for attracting the armature 50 . During specific implementation, the anti -disturbance coil L and the tripping coil L can be superimposed and wound on the same side of the yoke 40. By setting the winding directions of the two in opposite directions, the two can produce opposite directions when they are energized. magnetic field.

当系统遭受雷击造成被测线路中存在雷电能量时，该雷电能量使得整流电路10输出的第一电信号的电压值不小于第一预设阈值，从而可将TVS导通，使得第一电信号经过抗扰线圈L抗，抗扰线圈L抗在得电后会产生与永磁体60产生的磁场方向相同的磁场，即可以增强脱扣器200内部磁路的磁场强度，从而使衔铁50可以牢靠地吸附在磁轭40的第二端42，避免脱扣器200误动作；当系统出现漏电故障时，由于被测线路上出现的电流较小，整流电路10输出的第一电信号的电压值还不足以使TVS导通，这时第一电信号可直接输出至剩余电流判断电路30，由剩余电流判断电路30决定脱扣器200是否动作。When the system is struck by lightning and there is lightning energy in the line under test, the lightning energy makes the voltage value of the first electrical signal output by the rectifier circuit 10 not less than the first preset threshold, so that the TVS can be turned on, so that the first electrical signal After the anti-disturbance coil L, the anti-disturbance coil L will generate a magnetic field in the same direction as the magnetic field generated by the permanent magnet 60 after being energized, that is, the magnetic field strength of the internal magnetic circuit of the release 200 can be enhanced, so that the armature 50 can be reliably The ground is adsorbed on the second end 42 of the yoke 40 to avoid the malfunction of the release 200; when a leakage fault occurs in the system, the voltage value of the first electrical signal output by the rectifier circuit 10 will If it is not enough to turn on the TVS, the first electrical signal can be directly output to the residual current judging circuit 30, and the residual current judging circuit 30 determines whether the release 200 is activated.

在本申请的一个具体的实施例中，抗扰线圈L抗可并联在电路模块100中，参考图4所示，抗扰线圈L抗的一端与整流电路10的第一输出端点以及剩余电流判断电路30的第一输入端点连接，另一端与TVS的一端连接，TVS的另一端则与整流电路10的第二输出端点及剩余电流判断电路30的第二输入端点连接。In a specific embodiment of the present application, the anti-disturbance coil L can be connected in parallel in the circuit module 100, as shown in FIG. The first input terminal of the circuit 30 is connected, the other end is connected with one end of TVS, and the other end of TVS is connected with the second output terminal of the rectifying circuit 10 and the second input terminal of the residual current judging circuit 30 .

参考图5所示的本申请实施例提供的另一种电路模块的结构示意图，在该实施例中，抗扰线圈L抗还可以串联在电路模块100中。具体设置时，抗扰线圈L抗的一端与整流电路10的第一输出端点连接，另一端与TVS的一端以及剩余电流判断电路30的第一输入端点连接，TVS的另一端则与整流电路10的第二输出端点以及剩余电流判断电路30的第二输入端点连接。采用这种设置，在系统正常工作时，被测线路中无漏电流，抗扰线圈L抗中也没有电流经过，因此不会在脱扣器内产生磁场；当系统遭受雷击时，整流电路10输出的第一电信号使TVS导通，抗扰线圈L抗得电后可增强脱扣器内部磁路的磁场强度，使脱扣器保持闭合状态；当系统出现漏电故障时，尽管整流电路10输出的第一电信号会经过抗扰线圈L抗，但是由于其电流值相对较小，因此抗扰线圈L抗所产生的磁场强度要远小于脱扣线圈L脱得电时产生的磁场强度，因此也不会对脱扣器的动作产生影响。Referring to FIG. 5 , which is a schematic structural diagram of another circuit module provided by an embodiment of the present application, in this embodiment, the anti -disturbance coil L can also be connected in series in the circuit module 100 . During specific setting, one end of the anti-disturbance coil L is connected to the first output terminal of the rectifier circuit 10, the other end is connected to one end of the TVS and the first input terminal of the residual current judgment circuit 30, and the other end of the TVS is connected to the rectifier circuit 10. The second output terminal of the residual current judging circuit 30 is connected with the second input terminal. With this setting, when the system is working normally, there is no leakage current in the tested line, and there is no current passing through the anti-disturbance coil L, so no magnetic field will be generated in the release; when the system is struck by lightning, the rectifier circuit 10 The first electrical signal output makes the TVS turn on, and the anti-disturbance coil L can strengthen the magnetic field strength of the internal magnetic circuit of the release after being energized , so that the release remains closed; when the system has a leakage fault, although the rectification circuit 10 The first output electrical signal will pass through the anti-disturbance coil L, but because its current value is relatively small, the magnetic field strength generated by the anti-disturbance coil L is much smaller than that generated when the tripping coil L is de -energized. Therefore, it will not affect the action of the release.

继续参考图5，在本申请实施例中，剩余电流判断电路30可包括检测器和驱动电路，其中，检测器可与抗扰电路20的输出端连接，其作用为在流入剩余电流判断电路30的电流值大于或等于第二预设阈值时，向驱动电路发送驱动信号；驱动电路分别与上述检测器和抗扰线圈20连接，其作用为在接收到驱动信号时，将驱动信号的功率进行放大生成控制信号，并将控制信号发送给脱扣线圈L脱，使脱扣线圈L脱得电，进而控制脱扣器断开。Continuing to refer to FIG. 5, in the embodiment of the present application, the residual current judging circuit 30 may include a detector and a drive circuit, wherein the detector may be connected to the output terminal of the anti-disturbance circuit 20, and its function is to flow into the residual current judging circuit 30 When the current value is greater than or equal to the second preset threshold value, a drive signal is sent to the drive circuit; the drive circuit is connected to the above-mentioned detector and the anti-disturbance coil 20 respectively, and its function is to perform the power of the drive signal when receiving the drive signal. Amplify and generate a control signal, and send the control signal to the trip coil L to release , so that the trip coil L is released and energized, and then the release is controlled to be disconnected.

具体地，检测器可包括检测芯片、第一电容C1和第一电阻R1，其中R1的第一端为剩余电流判断电路30的第一输入端点，R1的第二端与C1的第一端连接，C1的第二端为剩余电流判断电路的第二输入端点；检测芯片的第一输入端与R1的第二端及C1的第一端连接，检测芯片的第二输入端与参考电源连接，检测芯片的输出端与驱动电路连接。Specifically, the detector may include a detection chip, a first capacitor C1 and a first resistor R1, wherein the first terminal of R1 is the first input terminal of the residual current judging circuit 30, and the second terminal of R1 is connected to the first terminal of C1 , the second end of C1 is the second input terminal of the residual current judgment circuit; the first input end of the detection chip is connected with the second end of R1 and the first end of C1, and the second input end of the detection chip is connected with the reference power supply, The output end of the detection chip is connected with the driving circuit.

驱动电路可包括第二电阻R2、第三电阻R3、第四电阻R4、第五电阻R5、第五二极管D5、第二电容C2和NPN型三极管Q1。其中，R2的第一端与D5的阳极以及检测芯片的输出端连接，R2的第二端与检测芯片的第二输入端以及R3的第二端连接；D5的阴极与R3的第一端以及R4的第一端连接；R4的第二端与C2的第一端以及R5的第一端连接；NPN型三极管Q1的发射极与脱扣线圈L脱连接，NPN型三极管的基极与R5的第二端连接，NPN型三极管的集电极与C2的第二端连接。The driving circuit may include a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth diode D5, a second capacitor C2 and an NPN transistor Q1. Wherein, the first end of R2 is connected with the anode of D5 and the output end of the detection chip, the second end of R2 is connected with the second input end of the detection chip and the second end of R3; the cathode of D5 is connected with the first end of R3 and The first end of R4 is connected; the second end of R4 is connected to the first end of C2 and the first end of R5; the emitter of NPN transistor Q1 is disconnected from the trip coil L, and the base of NPN transistor is connected to R5 The second end is connected, and the collector of the NPN transistor is connected with the second end of C2.

上述实施例提供的剩余电流判断电路30，当电流流入剩余电流判断电路30时可向C1充电，若流入剩余电流判断电路的电流值大于或等于第二预设阈值，使得C1两端的电压值大于参考电源电压，这时检测芯片可输出高压驱动信号，并通过R2、R3、R4、R5和D5对该驱动信号进行放大以生成控制信号，进而通过该控制信号驱动NPN型三极管Q1导通，此时脱扣线圈L脱得电，使脱扣器由闭合状态切换为断开状态，切断系统的供电路径，避免由于漏电故障损坏负载以及相关电器件。The residual current judging circuit 30 provided in the above embodiment can charge C1 when the current flows into the residual current judging circuit 30. If the current value flowing into the residual current judging circuit is greater than or equal to the second preset threshold value, the voltage value at both ends of C1 is greater than Refer to the power supply voltage. At this time, the detection chip can output a high-voltage driving signal, and amplify the driving signal through R2, R3, R4, R5 and D5 to generate a control signal, and then drive the NPN transistor Q1 to conduct through the control signal. When the trip coil L is de- energized, the release switches from the closed state to the open state, cuts off the power supply path of the system, and avoids damage to the load and related electrical components due to leakage faults.

应当说明的是，在本申请一些可能的实施例中，为了减小电流互感器的二次侧输出的电信号的波动，在电流互感器的二次侧和整流电路10之间还可设置有稳压电路，该稳压电路包括第六电阻R6和第三电容C3，其中，R6的第一端与电流互感器的二次侧的一端连接，R6的第二端与电流互感器的二次侧的另一端连接；C3的第一端与R6的第一端连接，C3的第二端与R6的第二端连接。It should be noted that, in some possible embodiments of the present application, in order to reduce the fluctuation of the electrical signal output by the secondary side of the current transformer, a A voltage stabilizing circuit, the voltage stabilizing circuit includes a sixth resistor R6 and a third capacitor C3, wherein the first end of R6 is connected to one end of the secondary side of the current transformer, and the second end of R6 is connected to the secondary side of the current transformer The other end of the side is connected; the first end of C3 is connected with the first end of R6, and the second end of C3 is connected with the second end of R6.

下面以图5所示的电路模块100为例，详细说明剩余电流保护装置的工作原理。The following takes the circuit module 100 shown in FIG. 5 as an example to describe the working principle of the residual current protection device in detail.

在图5所示的实施例中，A和B作为电路模块100的输入端，与电流互感器的二次侧连接，C和D作为电路模块100的输出端，与脱扣器的脱扣线圈L脱连接。当系统遭受雷击时，被测线路上的电流发生突增，此时电流互感器的二次侧感应到较大电流和较高电压，致使整流电路10输出的第一电信号的电压值也较大，当第一电信号的电压值大于第一预设阈值(TVS的开启电压)时，TVS导通，此时TVS和抗扰线圈L抗与电流互感器的二次侧形成一个导通路径，使第一电信号经过抗扰线圈L抗，抗扰线圈L抗在得电后可以增强脱扣器内部磁路的磁场强度，从而使衔铁可以牢靠地吸附在磁轭的第二端，避免脱扣器误动作；In the embodiment shown in Figure 5, A and B are used as the input terminals of the circuit module 100, connected to the secondary side of the current transformer, C and D are used as the output terminals of the circuit module 100, connected to the tripping coil of the release L is disconnected . When the system is struck by lightning, the current on the line under test increases suddenly. At this time, the secondary side of the current transformer induces a relatively large current and relatively high voltage, so that the voltage value of the first electrical signal output by the rectifier circuit 10 is also relatively high. Large, when the voltage value of the first electrical signal is greater than the first preset threshold (TVS turn-on voltage), the TVS is turned on, and at this time, the TVS and the anti -disturbance coil L form a conduction path with the secondary side of the current transformer , so that the first electrical signal passes through the anti-disturbance coil L, and the anti-disturbance coil L can enhance the magnetic field strength of the internal magnetic circuit of the release after being energized, so that the armature can be firmly adsorbed on the second end of the yoke to avoid Malfunction of the release;

当系统出现漏电故障时，被测线路上出现的电流较小，因此电流互感器的二次侧感应到的电流和电压也相对较小，此时整流电路10输出的第一电信号的电压值达不到TVS的开启电压(第一电信号的电压值小于第一预设阈值)，TVS所在的支路不工作，使第一电信号直接输出至剩余电流判断电路30，为C1充电，此时若流入剩余电流判断电路30的电流值大于或等于第二预设阈值，使得C1两端的电压值大于参考电源电压时，检测芯片发送驱动信号，驱动NPN型三极管Q1导通，使脱扣线圈L脱得电，将系统的供电路径切断，实现保护负载以及系统中相关电器件的安全的目的。When a leakage fault occurs in the system, the current on the line under test is relatively small, so the current and voltage induced by the secondary side of the current transformer are also relatively small. At this time, the voltage value of the first electrical signal output by the rectifier circuit 10 is If the turn-on voltage of the TVS is not reached (the voltage value of the first electrical signal is less than the first preset threshold), the branch where the TVS is located does not work, so that the first electrical signal is directly output to the residual current judging circuit 30 to charge C1. If the current value flowing into the residual current judging circuit 30 is greater than or equal to the second preset threshold value, so that the voltage value at both ends of C1 is greater than the reference power supply voltage, the detection chip sends a driving signal to drive the NPN transistor Q1 to conduct, so that the tripping coil When L is de- energized, the power supply path of the system is cut off to achieve the purpose of protecting the load and the safety of related electrical devices in the system.

参考图6所示，本申请实施例还提供了一种配电盒2，该配电盒2用于实现电路的部署分配，可以应用在无线大功率5G(第五代移动通信技术，简称5G)基站的供配电系统中，也可以应用在家庭电路的供配电系统中，本申请对此不做具体限定。该配电盒2包括盒体以及一个或多个上述的剩余电流保护装置1，盒体上设有与剩余电流保护装置1一一对应设置的导轨，以使剩余电流保护装置1可卡接在导轨内，其中，剩余电流保护装置1的电流互感器一次侧可与供配电系统的供电线路连接，以检测系统的供电线路上是否有故障电流。Referring to Fig. 6, the embodiment of the present application also provides a power distribution box 2, which is used to realize the deployment and distribution of circuits, and can be applied in wireless high-power 5G (fifth generation mobile communication technology, referred to as 5G ) in the power supply and distribution system of the base station, and can also be applied in the power supply and distribution system of household circuits, which is not specifically limited in this application. The power distribution box 2 includes a box body and one or more of the above-mentioned residual current protection devices 1, and the box body is provided with guide rails corresponding to the residual current protection devices 1 one by one, so that the residual current protection device 1 can be clamped on the In the guide rail, the primary side of the current transformer of the residual current protection device 1 can be connected to the power supply line of the power supply and distribution system to detect whether there is a fault current on the power supply line of the system.

以上，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should cover Within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (10)

1. The utility model provides a residual current protection device, its characterized in that includes current transformer, circuit module and release, circuit module includes rectifier circuit, immunity circuit and residual current judgement circuit, wherein:
the rectifying circuit is connected with the secondary side of the current transformer and is used for conditioning and outputting an electric signal output by the secondary side of the current transformer;
the anti-interference circuit is connected with the output end of the rectifying circuit and the tripper and is used for receiving a first electric signal output by the rectifying circuit, controlling the tripper to be closed when the voltage value of the first electric signal is greater than or equal to a first preset threshold value, and outputting the first electric signal to the residual current judging circuit when the voltage value of the first electric signal is less than the first preset threshold value;
the residual current judging circuit is connected with the output end of the anti-interference circuit and the tripper and is used for controlling the tripper to be disconnected when the current flowing into the residual current judging circuit meets a preset condition;
the anti-interference circuit comprises a transient suppression diode and an anti-interference coil which are arranged between two output end points of the rectifying circuit in series.
2. The residual current protection device of claim 1, wherein the trip unit comprises a yoke, an armature, a permanent magnet, and a trip coil;
one side of the magnetic yoke is provided with an opening, and the opening side of the magnetic yoke is provided with a first end and a second end;
the armature is arranged on the opening side of the magnetic yoke and hinged to the first end of the magnetic yoke, and the armature is contacted with or separated from the second end of the magnetic yoke when rotating;
the permanent magnet is arranged on the magnetic yoke and is used for enabling the second end of the magnetic yoke to generate magnetic force for adsorbing the armature;
the tripping coil is sleeved on the yoke iron of the magnetic yoke, is connected with the residual current judging circuit and is used for enabling the second end of the magnetic yoke to generate magnetic force for repelling the armature iron when electrified.
3. The residual current protection device according to claim 2, wherein the transient suppression diode is configured to conduct when the voltage value of the first electrical signal is greater than or equal to the first preset threshold, so that the first electrical signal passes through the immunity coil, and to output the first electrical signal to the residual current determination circuit when the voltage value of the first electrical signal is less than the first preset threshold;
the anti-interference coil is sleeved on the yoke iron of the magnetic yoke and used for enabling the second end of the magnetic yoke to generate magnetic force for adsorbing the armature iron when the magnetic yoke is electrified.
4. The residual current protection device according to claim 3, wherein one end of the anti-interference coil is connected to the first output terminal of the rectifying circuit and the first input terminal of the residual current judging circuit, and the other end is connected to one end of the transient suppression diode;
the other end of the transient suppression diode is connected with a second output end point of the rectifying circuit and a second input end point of the residual current judgment residual circuit.
5. The residual current protection device according to claim 3, wherein one end of the anti-interference coil is connected to the first output terminal of the rectifying circuit, and the other end of the anti-interference coil is connected to one end of the transient suppression diode and the first input terminal of the residual current determination circuit;
and the other end of the transient suppression diode is connected with a second output end point of the rectifying circuit and a second input end point of the current judgment residual circuit.
6. The residual current protection device according to any one of claims 3 to 5, wherein the anti-interference coil and the trip coil are sleeved on the same yoke of the magnetic yoke, and the winding directions of the anti-interference coil and the trip coil are opposite.
7. The residual current protection device according to any one of claims 3 to 5, characterized in that said trip unit further comprises an elastic member, one end of said elastic member is connected with said yoke, and the other end is connected with one side of the first end of said yoke where said armature is hinged;
when the armature contacts the second end of the magnetic yoke, the elastic piece is in an energy storage state; when the armature is separated from the second end of the magnetic yoke, the elastic piece is in a release state.
8. The residual current protection device according to any one of claims 3 to 5, wherein the residual current determination circuit comprises a detector and a driving circuit;
the detector is connected with the output end of the anti-interference circuit and is used for sending a driving signal to the driving circuit when the current value flowing into the residual current judging circuit is greater than or equal to a second preset threshold value;
the driving circuit is connected with the detector and the trip coil and used for amplifying the power of the driving signal to generate a control signal and sending the control signal to the trip coil to enable the trip coil to be electrified.
9. The residual current protection device of claim 8, wherein the detector comprises a detection chip, a first capacitor and a first resistor;
one end of the first resistor is used as a first input end point of the residual current judging circuit, and the other end of the first resistor is connected with one end of the first capacitor and a first input end of the detection chip;
the other end of the first capacitor is used as a second input end point of the residual current judging circuit;
and the second input end of the detection chip is connected with a reference power supply, and the output end of the detection chip is connected with the driving circuit.
10. A distribution box, characterized in that, it comprises a box body and a residual current protection device as claimed in any one of claims 1 to 9, the box body is provided with a guide rail, and the residual current protection device is clamped in the guide rail.
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