WO2016026409A1 - 一种电子式电流互感器的大电流合成回路 - Google Patents

一种电子式电流互感器的大电流合成回路 Download PDF

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Publication number
WO2016026409A1
WO2016026409A1 PCT/CN2015/086999 CN2015086999W WO2016026409A1 WO 2016026409 A1 WO2016026409 A1 WO 2016026409A1 CN 2015086999 W CN2015086999 W CN 2015086999W WO 2016026409 A1 WO2016026409 A1 WO 2016026409A1
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Prior art keywords
copper
rectangular frame
conductor
conductor copper
insulating
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PCT/CN2015/086999
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English (en)
French (fr)
Inventor
汪本进
徐思恩
邱进
吴士普
王晓琪
余春雨
毛安澜
冯宇
杜砚
李璿
王玲
陈晓明
陈江波
许晶
何妍
费烨
周翠娟
朱丝丝
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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Publication of WO2016026409A1 publication Critical patent/WO2016026409A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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  • the invention relates to a large current synthesis loop, in particular to a large current synthesis loop of an electronic current transformer.
  • the primary current of the electromagnetic current transformer is too large.
  • the rated current of the large-capacity generator outlet current transformer reaches several tens of kA, so it cannot directly produce such a large amount in the factory inspection, laboratory testing and on-site handover detection. Stabilize the rated current once.
  • the core magnetic density of the current and measurement current transformers is higher than the protection level, and the cross-sectional area of the core is much smaller.
  • the primary bus is placed at the center of the current transformer.
  • the magnetic field generated by the primary current is evenly distributed inside the iron core, and the error performance satisfies the design requirements.
  • the error is detected by the ampoule method, although the wires are evenly distributed on the circumference of the winding, the generated magnetic field is uniformly segmented as a whole, but the magnetic field near the plane of each turn is the strongest, which causes the corresponding core to be magnetic.
  • the density increases, and even local magnetic saturation occurs.
  • the iron loss increases and the primary excitation current increases.
  • the transformer error also deviates accordingly. Therefore, it is necessary to appropriately increase the current transformer core cross section, reduce the magnetic density value, increase the shielding winding and optimize the primary conductor arrangement to overcome such deviation defects.
  • the sensing component of the electronic current transformer using the two sensing principles of Rogowski coil and Faraday magneto-optical effect has no iron core and no magnetic saturation.
  • the local strong magnetic field on the closed curve has no direct influence on the sensor output. Therefore, based on the structural characteristics of the electronic current transformer, it is necessary to provide an equal ampoule large current synthesis loop that is closer to the actual operating condition and can be equivalent to the primary current direct method.
  • the present invention provides a high current synthesis loop of an electronic current transformer, the loop comprising an AC loop unit and a DC loop unit, the loop comprising symmetrically connecting two rectangular frames a lead copper row on the same side;
  • the frame of the rectangular frame is composed of 10 ⁇ spaced conductor copper bars arranged in parallel;
  • the lead copper row includes four copper row taps, and two rectangular copper bodies are respectively disposed on the rectangular frame Row of taps;
  • the output end of the AC loop unit is any copper row tap of one rectangular frame and any copper row tap of another rectangular frame; the output end of the DC loop unit is the other two copper row taps.
  • an insulating epoxy board is disposed between the conductor copper strips; a conductor copper strip of one rectangular frame is arranged to cross the conductor copper strip of another rectangular frame body, so that alternating current and direct current are on the conductor copper strip Evenly distributed;
  • the conductor copper strips of the two rectangular frame connecting portions are fixed by an insulating clip;
  • the insulating clip comprises an insulating epoxy board, a long screw and a metal plate;
  • the insulating epoxy board is disposed between the conductor copper strips for connecting different tantalum conductor copper strips between two rectangular frame bodies, and insulating the connected conductor copper strips;
  • the long screw is fixed between the through hole of the conductor copper strip and the through hole of the insulating epoxy board, and the long screw is surrounded by an insulating tube;
  • the metal plate is disposed on the rectangular frame An outer side of the frame for clamping the conductor copper strip and the insulating epoxy board;
  • the conductor copper strip of the rectangular frame body is fixed by connecting members arranged at equal intervals;
  • the connecting member comprises an insulating epoxy board, a long screw and a metal plate;
  • the insulating epoxy board is disposed between the conductor copper strips for insulating the conductor copper strip of the AC loop unit from the conductor copper strip of the DC loop unit, and the AC loop Shorting the conductor copper strip of the unit to short the conductor copper strip of the DC loop unit;
  • the long screw is fixed between the through hole of the conductor copper strip and the through hole of the insulating epoxy board, and the long screw is surrounded by an insulating tube;
  • the metal plate is disposed on the rectangular frame An outer side of the frame for clamping the conductor copper strip and the insulating epoxy board;
  • the frame of the rectangular frame adopts an austenitic stainless steel plate
  • the copper row tap of the lead copper row comprises an insulating epoxy board, a long screw and a tap;
  • the insulating epoxy board is disposed between the conductor copper strips for changing the number of conductor copper busbars of the output ends of the AC loop unit and the DC loop unit;
  • the long screw is fixed between the through hole of the conductor copper row and the through hole of the insulating epoxy plate, and the long screw is surrounded by an insulating tube;
  • the tap is connected to an AC circuit and a DC link of the electronic current transformer.
  • the equal ampere-preparation method and the “8”-shaped rewinding structure are adopted, and each of the left and right sides is 10 ⁇ , a total of 20 ⁇ , and the multi-turn primary wires are equally distributed on the circumference of the winding, and the generated magnetic field is uniformly segmented uniformly.
  • the alternating current and direct current conductors are arranged in a staggered arrangement, and the alternating current and direct current two current conductors have the same structure, and are spatially approximated and combined to make the steady state power frequency current and the direct current instantaneous current perfectly synthesized;
  • connection piece is used for fastening the connection of up to 20 ⁇ copper bars with a connecting piece for the test circuit disassembly and assembly;
  • a plurality of taps can be arranged on the lead copper row, and the connection manners of the taps are different, the number of turns of the synthesis loop can be changed, and the versatility of the synthesis loop can be improved.
  • FIG. 1 is a perspective view of a high current synthesizing circuit of an electronic current transformer according to an embodiment of the present invention
  • FIG. 2 is a front elevational view of a high current synthesizing circuit of an electronic current transformer according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view of a high current synthesizing circuit of an electronic current transformer according to an embodiment of the present invention
  • Figure 4 is an exploded view of the insulating clip in the embodiment of the present invention.
  • Figure 5 is a schematic view showing a conductor copper strip fixed by a connecting member in the embodiment of the present invention.
  • 1 is an insulating clip
  • 2 is a connecting piece
  • 3 is a lead copper row
  • 4 is a copper row tap
  • 11 is an insulating epoxy board
  • 12 is a long screw
  • 13 is a metal plate.
  • the high current synthesis circuit suitable for the electronic current transformer provided by the present invention comprises two rectangular frame bodies, a conductor copper row, a lead copper row, an insulating clip and a connecting member;
  • the lead copper strips 3 are symmetrically connected to the same surface by rectangular frames, and the frame of each rectangular frame is composed of 10 turns of conductor copper strips arranged in parallel, and the two rectangular frames have a total of 20 turns of conductors.
  • the copper circuit that is, the AC circuit unit and the DC circuit unit of the synthesis circuit adopt the “8”-shaped rewinding structure, 10 ⁇ on the left and right, a total of 20 ⁇ , so that the multi-turn primary wires are equally distributed on the circumference of the winding, and the generated magnetic field is generally divided.
  • a uniform magnetic field can realize a large current output of up to 20,000 amps at a time;
  • the frame of the rectangular frame is made of austenitic stainless steel.
  • the lead copper row 3 includes four copper row taps 4, and each of the rectangular frame bodies is respectively provided with two copper row taps 4; the output end of the AC loop unit of the synthesis loop is any copper row tap 4 of a rectangular frame body and Any copper row tap 4 of another rectangular frame; the output of the DC loop unit is the other two copper row taps 4.
  • an insulating epoxy board is arranged between the conductor copper strips; a conductor copper strip of a rectangular frame body is arranged to cross the conductor copper strip of the other rectangular frame body, so that the alternating current and the direct current are evenly distributed on the conductor copper strip. Distribution; the conductor copper bars of the connecting portions of the two rectangular frames are fixed by the insulating clips.
  • the insulating clip comprises an insulating epoxy board 11, a long screw 12 and a metal plate 13;
  • the insulating epoxy board 11 is disposed between the conductor copper strips for connecting different conductor copper strips between the two rectangular frame bodies, and insulating the connected conductor copper strips;
  • the long screw 12 is fixed between the through hole of the conductor copper row and the through hole of the insulating epoxy board 11, and the long screw 12 is surrounded by the insulating tube; the metal plate 13 is disposed outside the frame of the rectangular frame for clamping the conductor copper Row and insulated epoxy board 11.
  • the conductor copper strip of the rectangular frame body is fixed by the connecting members arranged at equal intervals;
  • the connecting member comprises an insulating epoxy board, a long screw and a metal plate; as shown in FIG. 5, only one connecting piece can make up to 20 ⁇ copper row Fasten the connection for easy disassembly and assembly;
  • the insulating epoxy board is disposed between the conductor copper strips for insulating the conductor copper strip of the AC loop unit from the conductor copper strip of the DC loop unit, and shorting the conductor copper strip of the AC loop unit to connect the DC loop unit
  • the conductor copper row is shorted
  • the long screw is fixed between the through hole of the conductor copper row and the through hole of the insulating epoxy board, and the long screw is surrounded by the insulating tube; the metal plate is disposed outside the frame of the rectangular frame for clamping the conductor copper row and the Insulated epoxy board.
  • the copper row taps of the lead copper bars include insulated epoxy plates, long screws and taps.
  • a plurality of taps are designed in the middle of the loop, and the test circuit can be changed by different connection modes of the taps. number;
  • the insulating epoxy board is disposed between the conductor copper strips for changing the number of conductor copper strips of the output ends of the AC loop unit and the DC loop unit; the long screw is fixed to the through hole of the conductor copper strip and the through hole of the insulating epoxy board In between, the long screw is surrounded by an insulating tube; the tap is used for connecting with the AC circuit and the DC circuit of the electronic current transformer.
  • the large current synthesis circuit of the electronic current transformer comprises a rectangular frame disposed in the U-shaped groove; the frame of the rectangular frame is composed of a conductor copper row arranged in parallel at intervals of 10 inches; the number of the rectangular frame is 2, and the lead copper row
  • the rectangular frames are symmetrically connected on the same plane and fixed between the vertical frames of the U-shaped grooves; the lead copper bars are arranged on the horizontal frame of the U-shaped groove, including four copper row taps; and two rectangular frame bodies are respectively arranged Copper row taps.

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

一种电子式电流互感器的大电流合成回路，包括两个通过引线铜排（3）对称连接的矩形框体；矩形框体的框架内设置有10匝导体铜排；引线铜排（3）包括四个铜排抽头（4），矩形框体上分别设置两个铜排抽头（4）；交流回路单元的输出端为一个矩形框体的任一铜排抽头和另一个矩形框体的任一铜排抽头；直流回路单元的输出端为另外两个所述铜排抽头。采用了"8"字形回绕结构，让多匝一次导线在绕组圆周上均等分布，其产生的磁场整体上分段均匀，实现一次大电流可达2万安培的输出。

Description

一种电子式电流互感器的大电流合成回路 技术领域
本发明涉及一种大电流合成回路，具体涉及一种电子式电流互感器的大电流合成回路。
背景技术
电磁式电流互感器的一次电流太大，如大容量发电机出口电流互感器的一次额定电流达到几十kA，因此在产品出厂检测、试验室检测和现场交接检测时均不能直接产生这样大的稳定一次额定电流。
目前，一般用一次导体均匀绕制等安匝的方法使单匝较小电流通过等安匝产生等效的一次大电流，即沿试品线圈圆周方向均匀绕制软导线的数匝线圈作为一次等安匝线圈。但用等安匝法的电流互感器误差检测过程中，其误差与一次电流直接法的结果存在偏差，甚至有时达到1％。分析发现用两种试验方法出现较大偏差的误差均是计量级和测量级的电流互感器，而保护级电流互感器鲜见有类似现象。究其原因发现，设计时计量级和测量级电流互感器的铁芯磁密取值比保护级要高，且铁芯截面积也小很多；实际运行时，一次母线置于电流互感器中心位置，一次电流产生的磁场在铁芯内部分布较均匀，误差性能满足设计要求。等安匝法误差检测时，虽然多匝一次导线在绕组圆周上均等分布，产生的磁场整体分段均匀，但每匝线圈平面附近的磁场最强，这就造成其对应的铁芯局部的磁密增高，甚至出现局部磁饱和，铁损增加，一次励磁电流加大，最终造成互感器误差也相应出现偏差。因此，需要适当增加电流互感器铁芯截面、减小磁密取值、增加屏蔽绕组和优化一次导线布置等改进措施来克服这种偏差缺陷。
采用Rogowski线圈和法拉第磁光效应两种传感原理的电子式电流互感器的传感部件没有铁芯，没有磁饱和现象，闭合曲线上的局部强磁场对传感器输出没有直接影响。因此，基于电子式电流互感器的结构特点，需要提供一种更加接近实际工况运行且能够与一次电流直接法等效的等安匝大电流合成回路。
发明内容
为了满足现有技术的需要，本发明提供了一种电子式电流互感器的大电流合成回路，所述回路包括交流回路单元和直流回路单元，所述回路包括将两个矩形框体对称连接在同一面上的引线铜排；所述矩形框体的框架由10匝间隔平行设置的导体铜排组成；所述引线铜排包括四个铜排抽头，所述矩形框体上分别设置两个铜排抽头；
所述交流回路单元的输出端为一个矩形框体的任一铜排抽头和另一个矩形框体的任一铜排抽头；所述直流回路单元的输出端为另外两个所述铜排抽头。
优选的，所述导体铜排之间设置绝缘环氧板；一个矩形框体的导体铜排与另一个矩形框体的导体铜排交叉布置，使得交流电流和直流电流在所述导体铜排上均匀分布；
优选的，两个所述矩形框体连接部分的导体铜排通过绝缘夹件固定；所述绝缘夹件包括绝缘环氧板、长螺杆和金属板；
优选的，所述绝缘环氧板设置在所述导体铜排之间，用于连接两个矩形框体之间不同匝的导体铜排，并将连接后的导体铜排之间绝缘；
优选的，所述长螺杆固定在所述导体铜排的通孔和所述绝缘环氧板的通孔之间，所述长螺杆外包围有绝缘管；所述金属板设置在矩形框体的框架外侧，用于夹紧所述导体铜排和所述绝缘环氧板；
优选的，所述矩形框体的导体铜排通过等间距设置的连接件进行固定；所述连接件包括绝缘环氧板、长螺杆和金属板；
优选的，所述绝缘环氧板设置在所述导体铜排之间，用于将所述交流回路单元的导体铜排与所述直流回路单元的导体铜排进行绝缘，并将所述交流回路单元的导体铜排短接，将所述直流回路单元的导体铜排短接；
优选的，所述长螺杆固定在所述导体铜排的通孔和所述绝缘环氧板的通孔之间，所述长螺杆外包围有绝缘管；所述金属板设置在矩形框体的框架外侧，用于夹紧所述导体铜排和所述绝缘环氧板；
优选的，所述矩形框体的框架采用奥氏体不锈钢板；
优选的，所述引线铜排的铜排抽头包括绝缘环氧板、长螺杆和抽头；
所述绝缘环氧板设置在所述导体铜排之间，用于改变交流回路单元和直流回路单元的输出端的导体铜排匝数；
所述长螺杆固定在所述导体铜排的通孔和所述绝缘环氧板的通孔之间，所述长螺杆外包围有绝缘管；
所述抽头，用于与所述电子式电流互感器的交流回路和直流回路连接。
与最接近的现有技术相比，本发明的优异效果是：
1、本发明技术方案中，采用等安匝方法和“8”字形回绕结构，左右各10匝，共20匝，多匝一次导线在绕组圆周上均等分布，产生的磁场整体分段均匀，实现一次输出达2万安培的大电流；
2、本发明技术方案中，通过等安匝一次导体交错布置，交流直流两种电流导体的结构完全一样，在空间上近似合成一起，使稳态工频电流和直流瞬时电流完美合成；
3、本发明技术方案中的，铜排连接处用一只连接件使多达20匝铜排紧固连接，便于试验回路拆装；
4、本发明技术方案中，引线铜排上可以设置多个抽头，而各抽头的连接方式不同，可以改变合成回路的匝数，提高合成回路的通用性。
附图说明
下面结合附图对本发明进一步说明。
图1是：本发明实施例中一种电子式电流互感器的大电流合成回路的立体图；
图2是：本发明实施例中一种电子式电流互感器的大电流合成回路的正视图；
图3是：本发明实施例中一种电子式电流互感器的大电流合成回路的横截面图；
图4是：本发明实施例中绝缘夹件的分解图；
图5是：本发明实施例中连接件固定的导体铜排的示意图；
其中，1是绝缘夹件，2是连接件，3是引线铜排，4是铜排抽头；11是绝缘环氧板，12是长螺杆，13是金属板。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的组件或具有相同或类似功能的组件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
本发明提供的适用于电子式电流互感器的大电流合成回路，如图1所示，包括两个矩形框体、导体铜排、引线铜排、绝缘夹件和连接件；
1、矩形框体；
如图1和2所示，引线铜排3将矩形框体对称连接在同一面上，每个矩形框体的框架由10匝间隔平行设置的导体铜排组成，两矩形框体共20匝导体铜排；即合成回路的交流回路单元和直流回路单元均采用“8”字形回绕结构，左右各10匝，共20匝，让多匝一次导线在绕组圆周上均等分布，产生的磁场整体上分段均匀的磁场，实现一次输出高达2万安培的大电流可；
矩形框体的框架采用奥氏体不锈钢板。
2、引线铜排；
引线铜排3包括四个铜排抽头4，每个矩形框体上分别设置两个铜排抽头4；该合成回路的交流回路单元的输出端为一个矩形框体的任一铜排抽头4和另一个矩形框体的任一铜排抽头4；直流回路单元的输出端为另外两个铜排抽头4。
3、导体铜排；
如图3所示，导体铜排之间设置绝缘环氧板；一个矩形框体的导体铜排与另一个矩形框体的导体铜排交叉布置，使得交流电流和直流电流在导体铜排上均匀分布；两个矩形框体连接部分的导体铜排通过绝缘夹件固定。
4、绝缘夹件；
如图4所示，绝缘夹件包括绝缘环氧板11、长螺杆12和金属板13；
绝缘环氧板11设置在导体铜排之间，用于连接两个矩形框体之间不同匝的导体铜排，并将连接后的导体铜排之间绝缘；
长螺杆12固定在导体铜排的通孔和绝缘环氧板11的通孔之间，长螺杆12外包围有绝缘管；金属板13设置在矩形框体的框架外侧，用于夹紧导体铜排和绝缘环氧板11。
5、连接件；
矩形框体的导体铜排通过等间距设置的连接件进行固定；连接件包括绝缘环氧板、长螺杆和金属板；如图5所示，仅用一只连接件最多可以使20匝铜排紧固连接，便于试验拆装；
绝缘环氧板设置在导体铜排之间，用于将交流回路单元的导体铜排与直流回路单元的导体铜排进行绝缘，并将交流回路单元的导体铜排短接，将直流回路单元的导体铜排短接；
长螺杆固定在导体铜排的通孔和绝缘环氧板的通孔之间，长螺杆外包围有绝缘管；金属板设置在矩形框体的框架外侧，用于夹紧导体铜排和所述绝缘环氧板。
6、引线铜排；
引线铜排的铜排抽头包括绝缘环氧板、长螺杆和抽头，为提高试验回路的通用性，在回路的中间设计了多个抽头，通过各抽头的不同连接方式，可以改变试验回路的匝数；
绝缘环氧板设置在导体铜排之间，用于改变交流回路单元和直流回路单元的输出端的导体铜排匝数；长螺杆固定在导体铜排的通孔和绝缘环氧板的通孔之间，长螺杆外包围有绝缘管；抽头，用于与电子式电流互感器的交流回路和直流回路连接。
本发明的另一个实施例为：
电子式电流互感器的大电流合成回路包括设置在U形槽内的矩形框体；矩形框体的框架由10匝间隔平行设置的导体铜排组成；矩形框体的数目为2，引线铜排将矩形框架对称连接在同一平面上后固定在U形槽的竖直架之间；引线铜排设置在U形槽的水平架上，包括四个铜排抽头；矩形框体上分别设置两个铜排抽头。
最后应当说明的是：所描述的实施例仅是本申请一部分实施例，而不是其全部的实施例，本领域普通技术人员在本发明的启发下对其所作的修改或变更均在申请待批的权利要求保护范围之内。

Claims (10)

  1. 一种电子式电流互感器的大电流合成回路，所述回路包括交流回路单元和直流回路单元，其特征在于，所述回路包括将两个矩形框体对称连接在同一面上的引线铜排；所述矩形框体的框架由10匝间隔平行设置的导体铜排组成；所述引线铜排包括四个铜排抽头，所述矩形框体上分别设置两个铜排抽头；
    所述交流回路单元的输出端为一个矩形框体的任一铜排抽头和另一个矩形框体的任一铜排抽头；所述直流回路单元的输出端为另外两个所述铜排抽头。
  2. 如权利要求1所述的回路，其特征在于，所述导体铜排之间设置绝缘环氧板；一个矩形框体的导体铜排与另一个矩形框体的导体铜排交叉布置，使得交流电流和直流电流在所述导体铜排上均匀分布。
  3. 如权利要求1所述的回路，其特征在于，两个所述矩形框体连接部分的导体铜排通过绝缘夹件固定；所述绝缘夹件包括绝缘环氧板、长螺杆和金属板。
  4. 如权利要求3所述的回路，其特征在于，所述绝缘环氧板设置在所述导体铜排之间，用于连接两个矩形框体之间不同匝的导体铜排，并将连接后的导体铜排之间绝缘。
  5. 如权利要求3所述的回路，其特征在于，所述长螺杆固定在所述导体铜排的通孔和所述绝缘环氧板的通孔之间，所述长螺杆外包围有绝缘管；所述金属板设置在矩形框体的框架外侧，用于夹紧所述导体铜排和所述绝缘环氧板。
  6. 如权利要求1所述的回路，其特征在于，所述矩形框体的导体铜排通过等间距设置的连接件进行固定；所述连接件包括绝缘环氧板、长螺杆和金属板。
  7. 如权利要求6所述的回路，其特征在于，所述绝缘环氧板设置在所述导体铜排之间，用于将所述交流回路单元的导体铜排与所述直流回路单元的导体铜排进行绝缘，并将所述交流回路单元的导体铜排短接，将所述直流回路单元的导体铜排短接。
  8. 如权利要求6所述的回路，其特征在于，所述长螺杆固定在所述导体铜排的通孔和所述绝缘环氧板的通孔之间，所述长螺杆外包围有绝缘管；所述金属板设置在矩形框体的框架外侧，用于夹紧所述导体铜排和所述绝缘环氧板。
  9. 如权利要求1所述的回路，其特征在于，所述矩形框体的框架采用奥氏体不锈钢板。
  10. 如权利要求1所述的回路，其特征在于，所述引线铜排的铜排抽头包括绝缘环氧板、长螺杆和抽头；
    所述绝缘环氧板设置在所述导体铜排之间，用于改变交流回路单元和直流回路单元的输出端的导体铜排匝数；
    所述长螺杆固定在所述导体铜排的通孔和所述绝缘环氧板的通孔之间，所述长螺杆外包围有绝缘管；
    所述抽头，用于与所述电子式电流互感器的交流回路和直流回路连接。
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