WO2013143469A1 - Earth leakage protection breaker with protection against low current fault between phase lines - Google Patents

Earth leakage protection breaker with protection against low current fault between phase lines Download PDF

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Publication number
WO2013143469A1
WO2013143469A1 PCT/CN2013/073320 CN2013073320W WO2013143469A1 WO 2013143469 A1 WO2013143469 A1 WO 2013143469A1 CN 2013073320 W CN2013073320 W CN 2013073320W WO 2013143469 A1 WO2013143469 A1 WO 2013143469A1
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line
current transformer
current
series
circuit breaker
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PCT/CN2013/073320
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French (fr)
Chinese (zh)
Inventor
许柱峰
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施耐德电器工业公司
杨武
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Publication of WO2013143469A1 publication Critical patent/WO2013143469A1/en

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Classifications

    • 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
    • H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • 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
    • H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • H02H3/30—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
    • H02H3/307—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers

Definitions

  • the invention relates to a leakage protection circuit breaker.
  • it relates to a leakage protection circuit breaker with phase-to-phase small current fault protection. Background technique
  • the traditional leakage protection circuit breaker protects the human body from electric shock or the equipment casing is charged.
  • the normal human body electric shock or the equipment casing is charged.
  • the human body or the equipment casing touches the single-phase phase line, and the electric shock current passes through the phase line.
  • the human body or the outer casing-the earth forms a loop, which causes residual current reaction and action on the human body/equipment.
  • the residual current of the system during normal operation is almost zero, so its action setting value can be set to be small (generally mA level).
  • the leakage protector reliably operates by detecting and processing the residual current, and cuts off the power supply, thereby protecting the safe power.
  • the conventional leakage protection circuit breaker lacks protection against a small leakage current generated by contact between the human body, equipment, and the like. Such a human body, equipment, etc., may cause electric shock between the phase lines, which may result in deterioration of insulation between the phase lines, which may also cause human injury or even death, equipment damage, and may cause a fire.
  • the present invention is directed to the above-described deficiencies of existing earth leakage circuit breakers, and provides a leakage protection circuit breaker that provides protection against relatively small leakage currents between phase lines.
  • a leakage protection circuit breaker including an interphase leakage current protection component, wherein the phase-to-phase leakage current protection component includes: a first current transformer including a first wire ⁇ , a number of turns N1 a third line N of N3 and a fifth line ⁇ for driving N5, the first line ⁇ is connected in series at the input end of the first phase line; the second current transformer includes the number of turns
  • the first current transformer and the second current transformer are composed of a core of permalloy.
  • the first current transformer is included in the outer casing of the earth leakage protection circuit breaker, and the second current transformer is not included in the outer casing of the earth leakage protection circuit breaker.
  • two diodes are connected in series between the two ends of the third coil of the first current transformer, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the two ends of the third coil;
  • Two diodes are connected in series between the two ends of the fourth coil of the current transformer, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the two ends of the fourth coil.
  • a protective jacket is provided for the connection of the third coil of the first current transformer and the fourth coil of the second current transformer in series to form a closed loop.
  • FIG. 1 Schematic diagram of the flow protection department.
  • the same components as the prior art leakage protection circuit breaker are omitted.
  • the illustration is made to prevent unnecessary details from confusing the technical idea of the present invention.
  • the current transformer CT1 is composed of a ferroalloy core, and a primary winding ⁇ CT1-N1 with a number of turns N1 is wound on the core of the CT1, and the CT1-N1 turns are connected in series.
  • the current transformer CT1 is included in the casing of the earth leakage protection circuit breaker according to the present invention, so that the CT1-N1 wire is connected in series at the input end of the phase line L1.
  • the current transformer CT1 is also wound with a secondary line ⁇ CT1-N3 with a number of turns N3.
  • the line ⁇ CT1-N5 for driving the protection relay RLY with N5 is also wound on the current transformer CT1.
  • the other current transformer CT2 is also composed of a ferroalloy core.
  • the primary winding of the number N2 is wound on the core of the CT2, and the CT2-N2 turns are also connected in series in the phase line L1.
  • the current transformer CT2 is not included in the different positions of the earth leakage protection circuit breakers CT1, CT2 according to the present invention installed in the phase line L1.
  • the current transformer CT2 also winds a secondary line ⁇ CT2-N4 with a number of turns N4.
  • Two diodes are connected in series between the two ends of the secondary line ⁇ CT1-N3 of the current transformer CT1, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the secondary lines ⁇ CT1-N3 Both ends.
  • Two diodes are connected in series between the two ends of the secondary line ⁇ CT2-N4 of the current transformer CT2, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the secondary line ⁇ CT2-N4 Both ends.
  • the current flowing through the secondary line ⁇ CT1-N3 is 13, and the magnetic flux of the secondary line ⁇ CT1-N3 is I3*N3;
  • the current flowing through the primary winding CT2-N2 is 12, and the magnetic flux of the primary winding CT2-N2 is I2*N2;
  • the current flowing through the secondary line ⁇ CT2-N4 is also 13, and the magnetic flux of the secondary line ⁇ CT2-N4 is I3* N4.
  • the series closed loop between the secondary line ⁇ CT1-N3 of the current transformer CT1 and the secondary line ⁇ CT2-N4 of the current transformer CT2 The connection may be damaged by an open circuit or a short circuit. This will cause the magnetic potential at the current transformer CT1 to be unbalanced, causing the protection relay RLY to malfunction and erroneously disconnect the phase line L1, L2 from the load. Therefore, it is possible to add a protective cover to the series closed loop connection when necessary to avoid malfunction.
  • the smaller leakage current generated by the contact between the phase lines provides protection, so that the protection function of the leakage protection circuit breaker is more comprehensive, filling the market gap of similar products, and making the product more competitive.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

An earth leakage protection breaker comprises a protection part for current leakage between phase lines. The protection part for current leakage between phase lines comprises: a first current transformer (CT1) comprising a first coil (CT1-N1) with N1 turns, a third coil (CT1-N3) with N3 turns, and a fifth coil (CT1-N5) with N5 turns for driving, the first coil being connected in series to an input terminal of a first phase line (L1); a second current transformer (CT2) comprising a second coil (CT2-N2) with N2 turns and a fourth coil (CT2-N4) with N4 turns, the second coil being connected in series to a position of the first phase line (L1) close to a load; and a protection relay (RLY) running with the current of the fifth coil (CT1-N5) to disconnect phase lines (L1, L2), wherein the third coil (CT1-N3) of the first current transformer (CT1) is connected in series to the fourth coil (CT2-N4) of the second current transformer (CT2) to form a closed loop, where N1=N2 and N3=N4.

Description

具有相线间小电流故障保护的漏电保护断路器 技术领域  Leakage protection circuit breaker with small current fault protection between phase lines
本发明涉及漏电保护断路器。 具体地， 涉及一种具有相间小电流故障保 护的漏电保护断路器。 背景技术  The invention relates to a leakage protection circuit breaker. In particular, it relates to a leakage protection circuit breaker with phase-to-phase small current fault protection. Background technique
传统的漏电保护断路器是针对人身触电或设备外壳带电的情况进行保 护，通常的人身触电或设备外壳带电的情况是指由人体或设备外壳触及单相 相线所致，触电电流通过相线 -人体 /或外壳-大地形成回路，对人体 /设备造成 余电流反应和动作， 正常运行时***的剩余电流几乎为零， 故它的动作整定 值可以整定得很小（一般为 mA级） ， 当***发生人身触电或设备外壳带电 时， 出现较大的剩余电流， 漏电保护器则通过检测和处理这个剩余电流后可 靠地动作， 切断电源， 从而对安全用电起到保护作用。  The traditional leakage protection circuit breaker protects the human body from electric shock or the equipment casing is charged. The normal human body electric shock or the equipment casing is charged. The human body or the equipment casing touches the single-phase phase line, and the electric shock current passes through the phase line. The human body or the outer casing-the earth forms a loop, which causes residual current reaction and action on the human body/equipment. The residual current of the system during normal operation is almost zero, so its action setting value can be set to be small (generally mA level). When the system is exposed to electric shock or the equipment casing is energized, a large residual current occurs. The leakage protector reliably operates by detecting and processing the residual current, and cuts off the power supply, thereby protecting the safe power.
但是， 传统的漏电保护断路器缺乏针对人体、 设备等在相线之间的接触 所产生的较小漏电流的保护。 这样的人体、 设备等在相线之间触电的情况的 起因可能是相线之间的绝缘恶化， 同样会造成人体伤害甚至死亡、 设备损毁 并有可能引发火灾。  However, the conventional leakage protection circuit breaker lacks protection against a small leakage current generated by contact between the human body, equipment, and the like. Such a human body, equipment, etc., may cause electric shock between the phase lines, which may result in deterioration of insulation between the phase lines, which may also cause human injury or even death, equipment damage, and may cause a fire.
因此， 需要提供一种针对诸如人体在相线之间的接触之类的所产生的较 小漏电流提供保护的漏电保护断路器。 发明内容  Accordingly, it is desirable to provide a leakage protection circuit breaker that provides protection against relatively small leakage currents such as human body contact between phase lines. Summary of the invention
本发明针对现有的漏电保护断路器的上述缺陷，提供针对相线之间的较 小漏电流提供保护的漏电保护断路器。  SUMMARY OF THE INVENTION The present invention is directed to the above-described deficiencies of existing earth leakage circuit breakers, and provides a leakage protection circuit breaker that provides protection against relatively small leakage currents between phase lines.
根据本发明的一方面， 提供一种漏电保护断路器， 包括相间漏电流保护 部件， 所述相间漏电流保护部件包括： 第一电流互感器， 包含匝数为 N1 的 第一线圏、 匝数为 N3的第三线圏以及用于驱动的匝数为 N5的第五线圏， 该第一线圏串联连接在第一相线的输入端处； 第二电流互感器， 包含匝数为 According to an aspect of the present invention, a leakage protection circuit breaker is provided, including an interphase leakage current protection component, wherein the phase-to-phase leakage current protection component includes: a first current transformer including a first wire 圏, a number of turns N1 a third line N of N3 and a fifth line 匝 for driving N5, the first line 圏 is connected in series at the input end of the first phase line; the second current transformer includes the number of turns
N2的第二线圏以及匝数为 N4的第四线圏，该第二线圏串联连接在第一相线 中的接近负载的位置处； 保护继电器， 基于第五线圏的电流而动作， 断开各 个相线的连接； 其中， 第一电流互感器的第三线圏与第二电流互感器的第四 线圏串联成闭合回路， 其中， N1=N2, N3=N4。 a second line N of N2 and a fourth line 匝 with a number of turns N4, the second line 圏 being connected in series to the first phase line a position near the load; a protection relay that operates based on the current of the fifth line ,, disconnecting the respective phase lines; wherein the third line of the first current transformer and the fourth line of the second current transformer圏 is connected in series to a closed loop, where N1=N2 and N3=N4.
其中， 第一电流互感器和第二电流互感器由坡莫合金为材料的铁芯组 成。  Wherein, the first current transformer and the second current transformer are composed of a core of permalloy.
其中， 第一电流互感器包括在漏电保护断路器的外壳之内， 第二电流互 感器不包括在漏电保护断路器的外壳之内。  Wherein the first current transformer is included in the outer casing of the earth leakage protection circuit breaker, and the second current transformer is not included in the outer casing of the earth leakage protection circuit breaker.
其中， 第一电流互感器的第三线圏的两端之间串联连接两个二极管， 该 两个二极管的阴极连接在一起，该两个二极管的阳极分别连接到第三线圏的 两端； 第二电流互感器的第四线圏的两端之间串联连接两个二极管， 该两个 二极管的阴极连接在一起， 该两个二极管的阳极分别连接到第四线圏的两 端。  Wherein two diodes are connected in series between the two ends of the third coil of the first current transformer, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the two ends of the third coil; Two diodes are connected in series between the two ends of the fourth coil of the current transformer, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the two ends of the fourth coil.
其中， 为第一电流互感器的第三线圏与第二电流互感器的第四线圏串联 成闭合回路的连线提供保护外套。 在相线之间的接触之类的所产生的较小漏电流提供保护，从而使漏电保护断 路器的保护功能更全面， 填补同类产品的市场空白， 使产品更有竟争力。 附图说明  Wherein, a protective jacket is provided for the connection of the third coil of the first current transformer and the fourth coil of the second current transformer in series to form a closed loop. The smaller leakage current generated by the contact between the phase lines provides protection, so that the protection function of the leakage protection circuit breaker is more comprehensive, filling the market gap of similar products, and making the product more competitive. DRAWINGS
通过下面结合附图对示例实施例的详细描述， 将更好地理解本发明。 应 当清楚地理解， 所描述的示例实施例仅仅是作为说明和示例， 而本发明不限 于此。 本发明的精神和范围由所附权利要求书的具体内容限定。 下面描述附 图的筒要说明， 其中： 的原理图。 具体实施方式  The invention will be better understood from the following detailed description of exemplary embodiments of the invention. It should be clearly understood that the described example embodiments are merely illustrative and exemplary, and the invention is not limited thereto. The spirit and scope of the invention is defined by the scope of the appended claims. The following is a description of the barrel of the attached figure, where: The schematic. detailed description
现在参照附图 1  Referring now to Figure 1
间的漏电流保护部分 Leakage current protection part
流保护部 的原理图。 在图 1中， 省略了与现有技术的漏电保护断路器相同的组成部 的图示， 以便防止不必要的细节混淆本发明的技术思想。 Schematic diagram of the flow protection department. In FIG. 1, the same components as the prior art leakage protection circuit breaker are omitted. The illustration is made to prevent unnecessary details from confusing the technical idea of the present invention.
在图 1中， 电流互感器 CT1由坡莫合金为材料的铁芯组成， 在 CT1的 铁芯上绕制匝数为 N1 的一次线圏 CT1-N1 , 该 CT1-N1线圏串联连接在相 线 L1中，电流互感器 CT1包括在根据本发明的漏电保护断路器的外壳之内， 因此 CT1-N1线圏串联连接在相线 L1的输入端处。 电流互感器 CT1还绕制 有匝数为 N3的二次线圏 CT1-N3。 此外， 用于驱动保护继电器 RLY的匝数 为 N5的线圏 CT1-N5也绕制在电流互感器 CT1上。  In Fig. 1, the current transformer CT1 is composed of a ferroalloy core, and a primary winding 圏CT1-N1 with a number of turns N1 is wound on the core of the CT1, and the CT1-N1 turns are connected in series. In the line L1, the current transformer CT1 is included in the casing of the earth leakage protection circuit breaker according to the present invention, so that the CT1-N1 wire is connected in series at the input end of the phase line L1. The current transformer CT1 is also wound with a secondary line 圏 CT1-N3 with a number of turns N3. In addition, the line 圏 CT1-N5 for driving the protection relay RLY with N5 is also wound on the current transformer CT1.
另外的电流互感器 CT2也由坡莫合金为材料的铁芯组成， 在 CT2的铁 芯上绕制匝数为 N2的一次线圏，该 CT2-N2线圏也串联连接在相线 L1中的 接近负载的位置处，电流互感器 CT2不包括在根据本发明的漏电保护断路器 互感器 CT1、 CT2安装在相线 L1的不同位置。 电流互感器 CT2还绕制有匝 数为 N4的二次线圏 CT2-N4。  The other current transformer CT2 is also composed of a ferroalloy core. The primary winding of the number N2 is wound on the core of the CT2, and the CT2-N2 turns are also connected in series in the phase line L1. At a position close to the load, the current transformer CT2 is not included in the different positions of the earth leakage protection circuit breakers CT1, CT2 according to the present invention installed in the phase line L1. The current transformer CT2 also winds a secondary line 圏 CT2-N4 with a number of turns N4.
电流互感器 CT1的二次线圏 CT1-N3与电流互感器 CT2的二次线圏 CT2-N4串联成闭合回路。  Current transformer CT1 secondary line 圏 CT1-N3 and current transformer CT2 secondary line 圏 CT2-N4 in series to form a closed loop.
电流互感器 CT1的二次线圏 CT1-N3的两端之间串联连接两个二极管， 该两个二极管的阴极连接在一起， 该两个二极管的阳极分别连接到二次线圏 CT1-N3的两端。  Two diodes are connected in series between the two ends of the secondary line 圏CT1-N3 of the current transformer CT1, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the secondary lines 圏CT1-N3 Both ends.
电流互感器 CT2的二次线圏 CT2-N4的两端之间串联连接两个二极管， 该两个二极管的阴极连接在一起， 该两个二极管的阳极分别连接到二次线圏 CT2-N4的两端。  Two diodes are connected in series between the two ends of the secondary line 圏CT2-N4 of the current transformer CT2, the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the secondary line 圏CT2-N4 Both ends.
在电流互感器 CT1的二次线圏 CT1-N3和电流互感器 CT2的二次线圏 CT2-N4之间的串联闭合回路连线发生诸如断开的故障时，二次线圏 CT1-N3 的两端之间的两个二极管以及二次线圏 CT2-N4的两端之间的两个二极管可 以起到保护作用。  When a series closed loop connection between the secondary line 圏CT1-N3 of the current transformer CT1 and the secondary line 圏CT2-N4 of the current transformer CT2 occurs, such as a disconnection fault, the secondary line 圏CT1-N3 Two diodes between the two ends and two diodes between the two ends of the secondary line 圏CT2-N4 can provide protection.
假设：  Assumption:
流过一次线圏 CT1-N1的电流为 II , 则一次线圏 CT1-N1的磁通为 I1*N1;  The current flowing through the line 圏 CT1-N1 is II, then the magnetic flux of the primary line CT1-N1 is I1*N1;
流过二次线圏 CT1-N3的电流为 13 , 则二次线圏 CT1-N3的磁通为 I3*N3;  The current flowing through the secondary line 圏 CT1-N3 is 13, and the magnetic flux of the secondary line 圏 CT1-N3 is I3*N3;
流过一次线圏 CT2-N2的电流为 12, 则一次线圏 CT2-N2的磁通为 I2*N2; The current flowing through the primary winding CT2-N2 is 12, and the magnetic flux of the primary winding CT2-N2 is I2*N2;
由于二次线圏 CT1-N3与二次线圏 CT2-N4串联成闭合回路， 则流过二 次线圏 CT2-N4的电流也为 13 , 二次线圏 CT2-N4的磁通为 I3*N4。  Since the secondary line 圏CT1-N3 and the secondary line 圏CT2-N4 are connected in series to form a closed loop, the current flowing through the secondary line 圏CT2-N4 is also 13, and the magnetic flux of the secondary line 圏CT2-N4 is I3* N4.
现在， 可以使 N1=N2, N3=N4。  Now, you can make N1=N2, N3=N4.
因此， 对于电流互感器 CT2, I2*N2=I3*N4=I3*N3。  Therefore, for the current transformer CT2, I2*N2=I3*N4=I3*N3.
在电网正常工作时， 11= 12, 也即得到 I1*N1= I3*N3 , 此时， 电流互感 器 CT1上的用于驱动保护继电器 RLY的线圏 CT1-N5没有感生磁通， 因此 线圏 CT1-N5的电流为 0, 常闭的保护继电器 RLY不动作。  When the power grid is working normally, 11=12, that is, I1*N1=I3*N3 is obtained. At this time, the line 圏CT1-N5 on the current transformer CT1 for driving the protection relay RLY has no induced magnetic flux, so the line圏The current of CT1-N5 is 0, and the normally closed protection relay RLY does not operate.
当由于相线 Ll、 L2之间的绝缘恶化的而使得诸如人体在 Ll、 L2之间 的接触之类的动作 （就像在相线 Ll、 L2之间连接了一高电阻负载一样）产 生了如图 1所示的较小漏电流 Δ Ι时， 11≠12, 也即 I1*N1≠I3*N3, 此时， 电流互感器 CT1上的用于驱动保护继电器 RLY的线圏 CT1-N5产生感生磁 通 I1*N1-I3*N3, 因此线圏 CT1-N5的电流变为（I1*N1-I3*N3 ) /N5, 不为 0, 当漏电流 ΔΙ超过保护阈值时， 常闭的保护继电器 RLY动作， 使得相线 Ll、 L2均与负载断开连接， 起到了保护作用。  When an action such as contact between the human body at L1, L2 is caused by the deterioration of the insulation between the phase lines L1, L2 (like connecting a high-resistance load between the phase lines L1, L2) When the smaller leakage current Δ Ι shown in Fig. 1 is 11≠12, that is, I1*N1≠I3*N3, at this time, the line 圏CT1-N5 for driving the protection relay RLY on the current transformer CT1 is generated. Inductive flux I1*N1-I3*N3, so the current of line 圏CT1-N5 becomes (I1*N1-I3*N3) /N5, not 0, when the leakage current ΔΙ exceeds the protection threshold, normally closed The protection relay RLY operates, so that the phase lines L1 and L2 are disconnected from the load and play a protective role.
如果根据本发明的漏电保护断路器用在实际的环境恶劣潮湿的场所， 则 电流互感器 CT1的二次线圏 CT1-N3和电流互感器 CT2的二次线圏 CT2-N4 之间的串联闭合回路连线有可能发生断路或短路的损坏， 这样都会使电流互 感器 CT1处磁势不平衡， 导致保护继电器 RLY误动作而错误地断开相线 Ll、 L2与负载的连接。 因此可以在需要时对串联闭合回路连线增加保护外 套来避免误动作。 在相线之间的接触之类的所产生的较小漏电流提供保护，从而使漏电保护断 路器的保护功能更全面， 填补同类产品的市场空白， 使产品更有竟争力。  If the earth leakage protection circuit breaker according to the present invention is used in a place where the actual environment is harsh and humid, the series closed loop between the secondary line 圏CT1-N3 of the current transformer CT1 and the secondary line 圏CT2-N4 of the current transformer CT2 The connection may be damaged by an open circuit or a short circuit. This will cause the magnetic potential at the current transformer CT1 to be unbalanced, causing the protection relay RLY to malfunction and erroneously disconnect the phase line L1, L2 from the load. Therefore, it is possible to add a protective cover to the series closed loop connection when necessary to avoid malfunction. The smaller leakage current generated by the contact between the phase lines provides protection, so that the protection function of the leakage protection circuit breaker is more comprehensive, filling the market gap of similar products, and making the product more competitive.
虽然已经图示和描述了所考虑的本发明的示例实施例，但是本领域技术 人员可以理解， 随着技术的进步， 可以作出各种变更和修改并可以用等价物 替换其元素而不背离本发明的真实范围。  While the exemplary embodiments of the present invention have been shown and described, it will be understood by those skilled in the art The true range.

Claims

权利要求 Rights request
1、 一种漏电保护断路器， 其特征在于包括相间漏电流保护部件， 所述 相间漏电流保护部件包括： A leakage protection circuit breaker, comprising: an interphase leakage current protection component, wherein the phase leakage current protection component comprises:
第一电流互感器（CT1) , 包含匝数为 N1 的第一线圏 （CT1-N1) 、 匝 数为 N3的第三线圏 （CT1-N3) 以及用于驱动的匝数为 N5的第五线圏 ( CT1-N5 ) , 该第一线圏串联连接在第一相线（L1) 的输入端处，  The first current transformer (CT1) includes a first line 匝 (CT1-N1) having a number of turns N1, a third line 圏 (CT1-N3) having a number of turns N3, and a fifth number of turns N5 for driving a line CT (CT1-N5), the first line 圏 is connected in series at the input end of the first phase line (L1),
第二电流互感器（CT2) , 包含匝数为 N2的第二线圏 （CT2-N2) 以及 匝数为 N4的第四线圏 （CT2-N4) , 该第二线圏串联连接在第一相线 （ L1 ) 中的接近负载的位置处；  a second current transformer (CT2) comprising a second line 匝 (CT2-N2) having a number of turns N2 and a fourth line CT (CT2-N4) having a number N4, the second line 圏 being connected in series to the first phase line At a position close to the load in (L1);
保护继电器（RLY) , 基于第五线圏 （CT1-N5) 的电流而动作， 断开 各个相线（Ll、 L2) 的连接；  The protection relay (RLY) operates based on the current of the fifth line CT (CT1-N5), and disconnects the respective phase lines (L1, L2);
其中， 第一电流互感器（CT1)的第三线圏 （CT1-N3)与第二电流互感 器（CT2) 的第四线圏 （CT2-N4) 串联成闭合回路，  Wherein, the third line 圏 (CT1-N3) of the first current transformer (CT1) and the fourth line 圏 (CT2-N4) of the second current transformer (CT2) are connected in series to form a closed loop.
其中， N1=N2, N3=N4。  Where N1=N2 and N3=N4.
2、 如权利要求 1所述的漏电保护断路器， 其特征在于： 第一电流互感 器（CT1)和第二电流互感器（CT2) 由坡莫合金为材料的铁芯组成。  The earth leakage protection circuit breaker according to claim 1, wherein the first current transformer (CT1) and the second current transformer (CT2) are composed of a ferromagnetic material core.
3、 如权利要求 1所述的漏电保护断路器， 其特征在于： 第一电流互感 器（CT1) 包括在漏电保护断路器的外壳之内， 第二电流互感器（CT2) 不 包括在漏电保护断路器的外壳之内。  3. The earth leakage protection circuit breaker according to claim 1, wherein: the first current transformer (CT1) is included in a casing of the earth leakage protection circuit breaker, and the second current transformer (CT2) is not included in the earth leakage protection. Inside the outer casing of the circuit breaker.
4、 如权利要求 1所述的漏电保护断路器， 其特征在于： 第一电流互感 器（CT1)的第三线圏 （CT1-N3)的两端之间串联连接两个二极管， 该两个 二极管的阴极连接在一起， 该两个二极管的阳极分别连接到第三线圏  4. The earth leakage protection circuit breaker according to claim 1, wherein: two diodes are connected in series between the two ends of the third line (CT1-N3) of the first current transformer (CT1), the two diodes The cathodes are connected together, and the anodes of the two diodes are respectively connected to the third line
( CT1-N3 ) 的两端；  Both ends of (CT1-N3);
第二电流互感器（CT2)的第四线圏 （CT2-N4)的两端之间串联连接两 个二极管， 该两个二极管的阴极连接在一起， 该两个二极管的阳极分别连接 到第四线圏 （CT2-N4) 的两端。  Two diodes are connected in series between the two ends of the fourth line 圏 (CT2-N4) of the second current transformer (CT2), the cathodes of the two diodes are connected together, and the anodes of the two diodes are respectively connected to the fourth Both ends of the line (CT2-N4).
5、 如权利要求 1所述的漏电保护断路器， 其特征在于： 为第一电流互 感器（CT1) 的第三线圏 （CT1-N3)与第二电流互感器（CT2) 的第四线圏 5. The earth leakage protection circuit breaker according to claim 1, wherein: a third line CT (CT1-N3) of the first current transformer (CT1) and a fourth line of the second current transformer (CT2)
( CT2-N4 ) 串联成闭合回路的连线提供保护外套。 (CT2-N4) A series of closed loop connections provide a protective jacket.
PCT/CN2013/073320 2012-03-28 2013-03-28 Earth leakage protection breaker with protection against low current fault between phase lines WO2013143469A1 (en)

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DE3232612A1 (en) * 1982-07-26 1984-01-26 SERD Société d'Etude et de Réalisation de Disjoncteurs, 67024 Strasbourg Method for delaying the triggering of an earth-leakage current protection circuit breaker, and an earth-leakage current protection circuit breaker for carrying out the method
CN2054948U (en) * 1989-05-30 1990-03-21 舒正芳 Protecting device for leakage of electricity
CN2603562Y (en) * 2003-01-24 2004-02-11 吕希文 Leakage circuit breaker with phase-loss protection function
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