技术领域technical field
本实用新型涉及电网运行维护领域，具体涉及一种电力系统用CT计量绕组的自校线圈。The utility model relates to the field of power grid operation and maintenance, in particular to a self-calibrating coil of a CT metering winding for an electric power system.
背景技术Background technique
电力系统用电流互感器(CurrentTransformer，CT)的计量绕组需要按计量法的规定进行周期性检测。CT误差特性周期性检测是准确评估电网经济运行的重要依据。随着电压等级的提升，GIS管道直径与回路长度都会增加，对于安装在其表面的CT线圈进行误差特性测试的难度也会增加。当前电网工程主要是在CT线圈安装之前进行的误差测试，且多数情况均采用等安匝方法，即在CT线圈上缠绕一次导体，或者在安装有CT线圈数米长的罐体上缠绕一次导线。但是这种试验方法并未对CT进行真正意义上的误差特性交接试验。如果要在CT安装之后使用比较法进行CT误差特性试验，则需要通过GIS的两个出线套管、在其外侧接入标准CT和大功率升流器等设备，形成一个闭合大电流试验回路。这种方法在特高压工程中实施的难度很大，即使借助于接地刀闸，因接地刀闸的通流量仅有数百安培，所以也不能在稳态大电流下进行误差测量。如果采用这种方法进行误差测量，就要求断路器、隔离开关等设备按照大电流回路构成进行设计操作，这对设备制造单位提出了更高的要求。同时，由于试验回路特别长，大电流升流器的容量需求往往要大于，导致试验单位在设备投入和人力投入方面存在较大的负担。随着特高压工程的快速建设，设备数量越来越多，应考虑CT的状态检测及状态评估，减少运维工作量。The metering winding of a current transformer (CT) used in a power system needs to be periodically tested in accordance with the provisions of the metering law. The periodic detection of CT error characteristics is an important basis for accurately evaluating the economic operation of power grids. As the voltage level increases, the diameter and loop length of the GIS pipeline will increase, and the difficulty of testing the error characteristics of the CT coil installed on its surface will also increase. The current power grid project is mainly an error test before the CT coil is installed, and in most cases, the equal ampere-turn method is used, that is, the conductor is wound on the CT coil once, or the wire is wound on the tank with the CT coil several meters long. . However, this test method does not carry out a real error characteristic handover test on CT. If you want to use the comparison method to test the CT error characteristics after the CT is installed, you need to connect the standard CT and high-power current booster and other equipment outside the two outlet bushings of the GIS to form a closed high-current test loop. This method is very difficult to implement in UHV projects. Even with the help of a grounded knife switch, the flow rate of the grounded knife switch is only a few hundred amperes, so error measurement cannot be performed under steady-state high current. If this method is used for error measurement, equipment such as circuit breakers and isolating switches are required to be designed and operated according to the composition of large current circuits, which puts forward higher requirements for equipment manufacturers. At the same time, due to the extremely long test circuit, the capacity requirement of the high-current current booster is often greater than that, resulting in a greater burden on the test unit in terms of equipment investment and manpower input. With the rapid construction of UHV projects and the increasing number of equipment, CT status detection and status evaluation should be considered to reduce the workload of operation and maintenance.
将工频电流比例溯源技术应用于电力系统工程中，实现工程用CT误差特性的现场自校，大大提高运维工作效率，满足CT周期性误差特性检测需求。CT误差特性量值溯源最原始和最广泛的方法就是CT自校，工频电流传感器最早就是采用1A：1A的方式进行量值溯源。如果CT铁心的材料、尺寸，安匝数选择适当，即使不采用补偿等手段，CT的准确度水平可以达到非常高的水平。例如，国家高电压计量站中保存的电流互感器基准(一次电流范围0-60kA，准确度等级为2×10-7-1×10-6)就是采用自校方式进行的误差标定。目前，在欧洲、美国、加拿大等经济发达国家承担电流比例量值溯源与传递的实验室都采用自校手段进行电流互感器最高准确度等级的标定。其中，美国国家标准与技术研究院NIST的电流互感器误差准确度等级为1×10-5；德国联邦物理技术研究院PTB的误差准确度等级为2×10-6-1×10-5；加拿大国家研究院NRC的误差准确度等级为2×10-6-1×10-5。The power frequency current proportional traceability technology is applied to power system engineering to realize on-site self-calibration of engineering CT error characteristics, greatly improve the efficiency of operation and maintenance work, and meet the needs of CT periodic error characteristic detection. The most primitive and extensive method for traceability of the value of CT error characteristics is CT self-calibration. The power frequency current sensor first used the method of 1A:1A for traceability. If the material, size, and number of ampere-turns of the CT core are properly selected, even without compensation and other means, the accuracy level of the CT can reach a very high level. For example, the current transformer reference (primary current range 0-60kA, accuracy level 2×10-7 -1×10-6 ) stored in the national high-voltage metering station is an error calibration performed by self-calibration. At present, laboratories in Europe, the United States, Canada and other economically developed countries that are responsible for the traceability and transmission of current proportional values use self-calibration methods to calibrate current transformers with the highest level of accuracy. Among them, the error accuracy level of the current transformer of the National Institute of Standards and Technology NIST is 1×10-5 ; the error accuracy level of the German Federal Institute of Physics and Technology PTB is 2×10-6 -1×10-5 ; The error accuracy level of the NRC of the National Research Institute of Canada is 2×10-6 -1×10-5 .
对于测量用CT工作而言，CT自校方法是一种成熟的技术，但却从未在工程CT上采用，主要困难是工程用CT除了误差特性要求外，还有绝缘性能、耐受系统短路电流、长期工作发热等一系列测量用CT没有涉及的运行工况。此外，工程应用CT一定要操作方法简单，使用安全可靠。因此需要提供一种适用于特高压工程应用的自校式CT线圈设计方法。For measurement CT work, the CT self-calibration method is a mature technology, but it has never been used in engineering CT. The main difficulty is that in addition to the error characteristic requirements, engineering CT also has insulation performance and resistance to system short circuit. A series of operating conditions that are not involved in the CT for measurement such as current, long-term working heat, etc. In addition, engineering application CT must be easy to operate, safe and reliable to use. Therefore, it is necessary to provide a self-calibrating CT coil design method suitable for UHV engineering applications.
发明内容Contents of the invention
为了满足现有技术的需要，本实用新型提供了一种电力系统用CT计量绕组的自校线圈。In order to meet the needs of the prior art, the utility model provides a self-calibrating coil of a CT metering winding for a power system.
本实用新型的技术方案是：The technical scheme of the utility model is:
所述自校线圈包括一次绕组和二次绕组，所述二次绕组包括安匝数相同的第一绕组和第二绕组；The self-calibration coil includes a primary winding and a secondary winding, and the secondary winding includes a first winding and a second winding with the same number of ampere turns;
所述第一绕组的两端设置有连接端子，第二绕组的两端也设置有连接端子；所述连接端子的中部均设有一个镂空凹槽；Both ends of the first winding are provided with connection terminals, and both ends of the second winding are also provided with connection terminals; the middle part of the connection terminals is provided with a hollow groove;
所述自校线圈还包括一个卡槽开关：The self-calibration coil also includes a slot switch:
当电流互感器正常工作时，所述第一绕组和第二绕组通过卡槽开关并联连接；When the current transformer works normally, the first winding and the second winding are connected in parallel through a slot switch;
当电流互感器进行自校检测时，所述第一绕组和第二绕组断开连接。When the current transformer performs self-calibration detection, the first winding and the second winding are disconnected.
优选的，所述卡槽开关包括绝缘按钮a1、绝缘按钮a2、绝缘按钮b1和绝缘按钮b2；所述绝缘按钮a1通过导线与绝缘按钮b2连接，绝缘按钮a2也通过导线与绝缘按钮b1连接；Preferably, the card slot switch includes an insulating button a1, an insulating button a2, an insulating button b1 and an insulating button b2; the insulating button a1 is connected to the insulating button b2 through a wire, and the insulating button a2 is also connected to the insulating button b1 through a wire;
每个绝缘按钮均设置有一个凸点；Each insulating button is provided with a bump;
优选的，第一绕组和第二绕组通过卡槽开关并联连接时：Preferably, when the first winding and the second winding are connected in parallel through a slot switch:
绝缘按钮a1的凸点嵌入第一绕组一侧连接端子的镂空凹槽中，绝缘按钮b2的凸点嵌入第一绕组另一侧连接端子的镂空凹槽中；The convex point of the insulating button a1 is embedded in the hollow groove of the connecting terminal on one side of the first winding, and the convex point of the insulating button b2 is embedded in the hollow groove of the connecting terminal on the other side of the first winding;
绝缘按钮b1的凸点嵌入第二绕组一侧连接端子的镂空凹槽中，绝缘按钮a2的凸点嵌入第二绕组另一侧连接端子的镂空凹槽中；The convex point of the insulating button b1 is embedded in the hollow groove of the connecting terminal on one side of the second winding, and the convex point of the insulating button a2 is embedded in the hollow groove of the connecting terminal on the other side of the second winding;
优选的，所述第一绕组和第二绕组采用间隔并绕的方式绕制在电流互感器的铁芯上；Preferably, the first winding and the second winding are wound on the iron core of the current transformer in a spaced and parallel manner;
优选的，所述电流互感器的铁芯外部设置有保护盒。Preferably, a protective box is provided outside the iron core of the current transformer.
与最接近的现有技术相比，本实用新型的优异效果是：Compared with the closest prior art, the excellent effect of the utility model is:
1、本实用新型提供的一种电力系统用CT计量绕组的自校线圈，对电流互感器线圈进行误差测量时，不需要使用大型升流器、承受上千安培的长导线和精密标准器，大大降低了在工作现场对电流互感器的误差测量工作，简化了测量接线方式，提高了工作效率；1. The utility model provides a self-calibration coil for the CT metering winding of the power system. When measuring the error of the current transformer coil, there is no need to use a large current booster, a long wire that can withstand thousands of amperes, and a precision standard. It greatly reduces the error measurement of current transformers at the work site, simplifies the measurement wiring method, and improves work efficiency;
2、本实用新型提供的一种电力系统用CT计量绕组的自校线圈，第一绕组和第二绕组采用间隔并绕的方式绕制，减小了两个二次绕组之间的漏抗；2. The utility model provides a self-calibration coil for CT metering windings for power systems. The first winding and the second winding are wound in parallel at intervals, which reduces the leakage reactance between the two secondary windings;
3、本实用新型提供的一种电力系统用CT计量绕组的自校线圈，不仅可以应用于电流互感器的现场交接试验，还可以应用于电流互感器的器件检测；3. The utility model provides a self-calibration coil for CT metering windings for power systems, which can not only be applied to field handover tests of current transformers, but also can be applied to device detection of current transformers;
4、本实用新型提供的一种电力系统用CT计量绕组的自校线圈，第一绕组和第二绕组采用卡槽开关进行连接，方便了绕组的连接和更换。4. The utility model provides a self-calibration coil for CT metering windings for electric power systems. The first winding and the second winding are connected by slot switches, which facilitates the connection and replacement of the windings.
附图说明Description of drawings
下面结合附图对本实用新型进一步说明。Below in conjunction with accompanying drawing, the utility model is further described.
图1：本实用新型实施例中一种电力系统用CT计量绕组的自校线圈的设计原理图；Fig. 1: Design schematic diagram of a self-calibrating coil of a CT metering winding for a power system in an embodiment of the utility model;
图2：本实用新型实施例中电力系统用CT计量绕组的自校线圈的正视图；Figure 2: The front view of the self-calibration coil of the CT metering winding for the power system in the embodiment of the utility model;
图3：本实用新型实施例中电力系统用CT计量绕组的自校线圈的俯视图；Figure 3: A top view of the self-calibration coil of the CT metering winding for the power system in the embodiment of the utility model;
图4：本实用新型实施例中连接端子的结构示意图；Figure 4: Schematic diagram of the structure of the connecting terminal in the embodiment of the utility model;
图5：本实用新型实施例中卡槽开关的结构示意图；Figure 5: Schematic diagram of the structure of the card slot switch in the embodiment of the utility model;
其中，1：连接端子；2：铁芯的保护盒；3：二次绕组；4：铁芯。Among them, 1: connecting terminal; 2: protective box of iron core; 3: secondary winding; 4: iron core.
具体实施方式Detailed ways
下面详细描述本实用新型的实施例，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元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本实用新型，而不能理解为对本实用新型的限制。Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.
本实用新型提供的电力系统用CT计量绕组的自校线圈的具体实施例如图1所示，The specific embodiment of the self-calibration coil of the CT metering winding provided by the utility model is shown in Figure 1,
该自校线圈包括卡槽开关、一次绕组N1和二次绕组。The self-calibration coil includes a slot switch, a primary winding N1 anda secondary winding.
1、二次绕组1. Secondary winding
如图1所示，该二次绕组包括第一绕组N2和第二绕组N3。其中，As shown in FIG. 1 , the secondary winding includes a first winding N2 and a second winding N3 . in,
第一绕组N2的两端设置有连接端子S1和连接端子S2，如图4所示，连接端子的中部均设有一个镂空凹槽；Both ends of the first windingN2 are provided with connection terminals S1 and S2, as shown in Figure 4, a hollow groove is provided in the middle of the connection terminals;
第二绕组N3的两端也设置有连接端子S3和连接端子S4，如图4所示，连接端子的中部均设有一个镂空凹槽。Thetwo ends of the second winding N3 are also provided with a connection terminal S3 and a connection terminal S4. As shown in FIG. 4, a hollow groove is provided in the middle of the connection terminals.
本实施例中第一绕组和第二绕组采用间隔并绕的方式绕制在电流互感器的铁芯上，以减少两个二次绕组之间的额漏抗。电流互感器的铁芯外部设置有保护盒。In this embodiment, the first winding and the second winding are wound on the iron core of the current transformer in a manner of parallel winding at intervals, so as to reduce the leakage reactance between the two secondary windings. A protective box is arranged outside the iron core of the current transformer.
2、卡槽开关：2. Card slot switch:
如图5所示，该卡槽开关包括绝缘按钮a1、绝缘按钮a2、绝缘按钮b1和绝缘按钮b2。其中，As shown in FIG. 5 , the card slot switch includes an insulating button a1 , an insulating button a2 , an insulating button b1 and an insulating button b2 . in,
绝缘按钮a1通过导线与绝缘按钮b2连接，绝缘按钮a2也通过导线与绝缘按钮b1连接，绝缘按钮a1和绝缘按钮b1作为卡槽开关中开关K1的两端，绝缘按钮a2和绝缘按钮b2作为卡槽开关中开关K2的两端。并且每个绝缘按钮均设置有一个凸点。The insulating button a1 is connected to the insulating button b2 through a wire, and the insulating button a2 is also connected to the insulating button b1 through a wire. The insulating button a1 and the insulating button b1 are used as two endsof the switch K1 in the slot switch, and the insulating button a2 and the insulating button b2 are used asBoth ends of switch K2 in the card slot switch. And each insulating button is provided with a convex point.
(1)当电流互感器正常工作时，第一绕组和第二绕组通过卡槽开关并联连接，具体为：(1) When the current transformer is working normally, the first winding and the second winding are connected in parallel through the slot switch, specifically:
绝缘按钮a1的凸点嵌入第一绕组一侧连接端子的镂空凹槽中，绝缘按钮b2的凸点嵌入第一绕组另一侧连接端子的镂空凹槽中；绝缘按钮b1的凸点嵌入第二绕组一侧连接端子的镂空凹槽中，绝缘按钮a2的凸点嵌入第二绕组另一侧连接端子的镂空凹槽中。The bump of the insulating button a1 is embedded in the hollow groove of the connecting terminal on one side of the first winding, the bump of the insulating button b2 is embedded in the hollow groove of the connecting terminal on the other side of the first winding; the bump of the insulating button b1 is embedded in the second In the hollow groove of the connecting terminal on one side of the winding, the protrusion of the insulating button a2 is embedded in the hollow groove of the connecting terminal on the other side of the second winding.
即如图4和5所示，开关K1的两端分别嵌入连接端子S1和S3，开关K2的两端分别嵌入连接端子S2和S4。That is, as shown in FIGS. 4 and 5 , the two ends of the switch K1 are respectively embedded in the connection terminals S1 and S3 , and the two ends of the switch K2 are respectively embedded in the connection terminals S2 and S4 .
(2)当电流互感器进行自校检测时，第一绕组和第二绕组断开连接，具体工作过程为：(2) When the current transformer performs self-calibration detection, the first winding and the second winding are disconnected, and the specific working process is as follows:
本实施例中第一绕组N2和第二绕组N3的安匝数相同。In this embodiment, the ampere- turns of the first windingN2 and the second winding N3 are the same.
①：测量电流互感器正常工作时第一绕组的误差数据e11和第二绕组的误差数据e21，本实施例中采用比较法测量上述误差数据，也可以通过电流互感器的出厂试验和交接试验获取。①: Measure the error data e11 of the first winding and the error data e21 of the second winding when the current transformer is working normally. In this embodiment, the comparison method is used to measure the above error data. Trial acquisition.
②：将第一绕组N2作为新的一次绕组，第二绕组N3作为二次绕组组成自校准模块，即将图1所示的开关K1和K2断开，检测第二绕组N3的具体步骤包括：②: The first windingN2 is used as a new primary winding, and the second winding N3 is used as a secondary winding to form a self- calibration module, that is, the switches K1 and K2 shown in Figure1 are disconnected, and thesecond windingN3 is detected. Specific steps include:
a、向第一绕组N2通入电流C1；a. Pass current C1 into the first winding N2 ;
b、检测第二绕组N3中由于电磁互感产生的电流C2；b. Detecting the current C2 generated by the electromagnetic mutual inductance in the second winding N3 ;
c、计算电流C1和电流C2的误差数据e22；c. Calculate the error data e22 of the current C1 and the current C2 ;
d、比较误差数据e21和误差数据e22，判断第二绕组N3是否发生故障。d. Compare the error data e21 and the error data e22 to determine whether the second winding N3 is faulty.
③：将第二绕组N3作为新的一次绕组，第一绕组N2作为二次绕组组成自校准模块，即将图1所示的开关K1和K2断开，检测第一绕组N2的具体步骤包括：③:The second winding N3 is used as a new primary winding, and the first windingN2 is used as a secondary winding to form a self- calibration module, that is, the switches K1 and K2 shown in Figure1 are disconnected, and the first windingN2 is detected. Specific steps include:
a、向第二绕组N3通入电流C1；a. Pass current C1 to the second winding N3 ;
b、检测第一绕组N2中由于电磁互感产生的电流C2；b. Detecting the current C2 generated by the electromagnetic mutual inductance in the first winding N 2;
c、计算电流C1和电流C2的误差数据e12；c. Calculate the error data e12 of the current C1 and the current C2 ;
d、比较误差数据e11和误差数据e12，判断第一绕组N2是否发生故障。d. Compare the error data e11 and the error data e12 to determine whether the first winding N2 is faulty.
特高压电流互感器线圈尺寸较大，容易受到外磁场的干扰，最终导致磁路磁通量不均匀现象较为明显。此外由于系统投合过程及系统短路状态时产生的暂态电流可达50kA至63kA，形成的暂态磁场对电流互感器线圈的软磁材料会产生电动力作用，导致软磁材料在暂态过程中产生伸缩现象，局部磁导率发生变化，还会产生强烈的热应力等。因此本实施例中在电流互感器的铁芯外部设置有保护盒作为屏蔽层来缓解电流互感器线圈各部分磁通量不一致的现象，或者采用平衡绕组的手段来缓解电流磁通量不一致的现象。The UHV current transformer coil has a large size and is easily disturbed by the external magnetic field, which eventually leads to obvious uneven magnetic flux in the magnetic circuit. In addition, due to the transient current generated during the system switching process and the system short-circuit state can reach 50kA to 63kA, the formed transient magnetic field will have an electromotive force on the soft magnetic material of the current transformer coil, resulting in the soft magnetic material in the transient process. Stretching occurs, local magnetic permeability changes, and strong thermal stress occurs. Therefore, in this embodiment, a protective box is provided outside the iron core of the current transformer as a shielding layer to alleviate the inconsistency of the magnetic flux in each part of the current transformer coil, or the method of balancing the winding is used to alleviate the inconsistency of the current magnetic flux.
本实用新型中电力系统用CT计量绕组的自校线圈的工作过程的具体实施例为：The specific embodiment of the working process of the self-calibration coil of the CT metering winding for the power system in the utility model is:
本实施例中电流互感器线圈的额定电流比为3000A：1A，即用一根导线在其线圈中心穿一匝，二次输出电流应该为1A，根据等安匝原理，二次绕组为3000匝时，二次输出电流应该为1A。In this embodiment, the rated current ratio of the current transformer coil is 3000A: 1A, that is, a wire is used to pass a turn in the center of the coil, and the secondary output current should be 1A. According to the principle of equal ampere turns, the secondary winding is 3000 turns , the secondary output current should be 1A.
将第一绕组作为新的一次绕组，第二绕组仍作为二次绕组，在第一绕组上通入电流1A，则第二绕组理论上应该也产生1A的电流，计算第一绕组和第二绕组流通的电流误差。将该电流误差数据与电流互感器正常运行时计算到的第二绕组流通的电流误差数据进行比较，从而判断第二绕组是否发生短路或者其他损坏。电流互感器正常运行时的电流误差数据可以通过电流互感器的出厂试验和交接试验获取。The first winding is used as a new primary winding, the second winding is still used as a secondary winding, and a current of 1A is passed through the first winding, then the second winding should also generate a current of 1A in theory, and the first and second windings are calculated flow current error. The current error data is compared with the current error data flowing through the second winding calculated during normal operation of the current transformer, so as to determine whether the second winding is short-circuited or otherwise damaged. The current error data of the current transformer during normal operation can be obtained through the factory test and handover test of the current transformer.
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，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520554853.XUCN204855773U (en) | 2015-07-28 | 2015-07-28 | Self -correcting coil of CT measurement winding for electric power system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520554853.XUCN204855773U (en) | 2015-07-28 | 2015-07-28 | Self -correcting coil of CT measurement winding for electric power system |
| Publication Number | Publication Date |
|---|---|
| CN204855773Utrue CN204855773U (en) | 2015-12-09 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520554853.XUExpired - LifetimeCN204855773U (en) | 2015-07-28 | 2015-07-28 | Self -correcting coil of CT measurement winding for electric power system |
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| CN (1) | CN204855773U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291431A (en)* | 2016-10-24 | 2017-01-04 | 中国科学院上海应用物理研究所 | A kind of tracking accuracy measuring method of current sensor |
| WO2017016370A1 (en)* | 2015-07-28 | 2017-02-02 | 中国电力科学研究院 | Method of designing ultra-high voltage ct coil having self-calibration function |
| CN107170563A (en)* | 2017-05-09 | 2017-09-15 | 中国电力科学研究院 | A kind of current transformer and its method for self-calibrating with self-calibration function |
| US11538628B2 (en) | 2019-12-02 | 2022-12-27 | Panoramic Power Ltd. | Self calibration by signal injection |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017016370A1 (en)* | 2015-07-28 | 2017-02-02 | 中国电力科学研究院 | Method of designing ultra-high voltage ct coil having self-calibration function |
| CN106291431A (en)* | 2016-10-24 | 2017-01-04 | 中国科学院上海应用物理研究所 | A kind of tracking accuracy measuring method of current sensor |
| CN106291431B (en)* | 2016-10-24 | 2018-11-27 | 中国科学院上海应用物理研究所 | A kind of tracking accuracy measurement method of current sensor |
| CN107170563A (en)* | 2017-05-09 | 2017-09-15 | 中国电力科学研究院 | A kind of current transformer and its method for self-calibrating with self-calibration function |
| US11538628B2 (en) | 2019-12-02 | 2022-12-27 | Panoramic Power Ltd. | Self calibration by signal injection |
| US11705275B2 (en)* | 2019-12-02 | 2023-07-18 | Panoramic Power Ltd. | Self calibration by double signal sampling |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | Granted publication date:20151209 | |
| CX01 | Expiry of patent term |