CN202649451U - Portable current transformer polarity calibration instrument - Google Patents

Abstract

The utility model relates to a portable current transformer polarity calibration instrument which comprises a square shell and a panel. A battery and a slide-wire rheostat are arranged in the shell, an analog ammeter, a switch, an adjusting knob, a selective switch and connecting terminals are arranged on the panel, and the connecting terminals are connected with four leading-out terminals of a current transformer respectively. The portable current transformer polarity calibration instrument is simple in structure, convenient to carry, easy in connection, fine in functional quality and applicable to the mounting and maintaining process of relay protection, the working efficiency of workers can be greatly improved, and the workload of the workers is reduced.

Description

Translated fromChinese

便携式电流互感器极性校验仪Portable Current Transformer Polarity Calibrator

技术领域technical field

本实用新型涉及继电保护中的一种辅助工具，特别是一种用于电流互感器的极性校验仪。The utility model relates to an auxiliary tool in relay protection, in particular to a polarity calibrator for current transformers.

背景技术Background technique

电力系统中变压器和电流互感器在继电保护二次回路中分别起到一次、二次回路电压和电流的隔离作用，变压器和电流互感器的一次侧和二次侧都设置有两个或两个以上的引出端子，任何一侧的引出端子接线错误，都会使二次侧的相位发生180度变化，既影响继电保护装置的正确动作，又影响电力系统的运行监控和事故处理，严重时还会危及设备及人身安全。因此继电保护专业工作过程中，在安装或更换电流互感器前，首先要校验电流互感器的极性。目前在施工现场，常用于检测电流互感器极性的方法是，将电池组、指针表以及试验线拿到现场后临时进行线路的连接，存在许多不便：1）在线路的连接过程中，在连接电池时，需要采用焊接方式，如果焊接不牢固，极易影响判断结果；2）试验线、电池组以及电流互感器二次线圈的正负极均靠人为判断，其中任何一个环节失误都会导致判断结果的错误；3）连线不方便，不仅工作效率低下，而且增加了工作人员的工作量。In the power system, transformers and current transformers play the role of isolating primary and secondary circuit voltage and current respectively in the secondary circuit of relay protection. The primary side and secondary side of transformers and current transformers are equipped with two or two More than one lead-out terminal, wrong connection of lead-out terminal on any side will cause the phase of the secondary side to change by 180 degrees, which will not only affect the correct action of the relay protection device, but also affect the operation monitoring and accident handling of the power system. It will also endanger equipment and personal safety. Therefore, during the professional work of relay protection, before installing or replacing the current transformer, the polarity of the current transformer must be checked first. At present, at the construction site, the method commonly used to detect the polarity of the current transformer is to temporarily connect the line after taking the battery pack, pointer meter and test line to the site. There are many inconveniences: 1) During the connection process of the line, the When connecting the battery, it is necessary to use welding. If the welding is not firm, it will easily affect the judgment result; 2) The positive and negative poles of the test line, battery pack and secondary coil of the current transformer are all judged by humans, and any mistake in any link will lead to 3) The connection is inconvenient, which not only reduces the work efficiency, but also increases the workload of the staff.

实用新型内容Utility model content

本实用新型需要解决的技术问题是提供一种接线简单、携带方便，能够降低工作人员工作量、提高工作效率的便携式电流互感器极性校验仪。The technical problem to be solved by the utility model is to provide a portable current transformer polarity calibrator which is simple in wiring, easy to carry, can reduce the workload of staff and improve work efficiency.

为解决上述技术问题，本实用新型所采取的技术方案如下。In order to solve the problems of the technologies described above, the technical solutions adopted by the utility model are as follows.

便携式电流互感器极性校验仪，包括壳体以及与壳体相配装的面板，所述壳体内设置有电池和电阻，面板上设置有指针式电流表、开关以及接线端子，接线端子包括电流互感器一次侧接线端子P1、一次侧接线端子P2、二次侧接线端子T1以及二次侧接线端子T2；所述电池的正极依次经电阻、开关与一次侧接线端子P1连接，电池的负极直接与一次侧接线端子P2连接；所述指针式电流表的正极与二次侧接线端子T1连接，指针式电流表的负极与二次侧接线端子T2连接。The portable current transformer polarity calibrator includes a housing and a panel matched with the housing. The housing is provided with a battery and a resistor. The panel is provided with a pointer ammeter, a switch and a terminal. The terminal includes a current transformer. primary side terminal P1, primary side terminal P2, secondary side terminal T1, and secondary side terminal T2; the positive pole of the battery is connected to the primary side terminal P1 through a resistor and switch in sequence, and the negative pole of the battery is directly connected to the primary side terminal P1. The primary side terminal P2 is connected; the positive pole of the pointer ammeter is connected to the secondary side terminal T1, and the negative pole of the pointer ammeter is connected to the secondary side terminal T2.

本实用新型的改进在于：所述电池采用两组或两组以上的直流充电电池，电池组的选择开关设置在面板上。The improvement of the utility model is that: the battery adopts two or more sets of DC rechargeable batteries, and the selection switch of the battery pack is arranged on the panel.

本实用新型的进一步改进在于：所述电阻为滑线变阻器，滑线变阻器的调节旋钮设置在面板上。The further improvement of the utility model is that: the resistor is a sliding wire rheostat, and the adjusting knob of the sliding wire rheostat is arranged on the panel.

由于采用了上述技术方案，本实用新型取得的技术进步如下。Owing to adopting above-mentioned technical scheme, the technical progress that the utility model obtains is as follows.

本实用新型结构简单、携带方便、接线容易、功能性质量好，应用在继电保护的安装维护过程中，能够大大提高工作人员的工作效率，降低工作人员的工作量。本实用新型的使用，使继电保护的操作过程得到了规范，施工流程简单明了，电流互感器的极性检验正确性达到100%，提高工作效率约50%；进一步保证了继电保护装置的正确动作率，从根本上避免了电网或电力设备事故的发生，降低了经济损失。The utility model has the advantages of simple structure, convenient portability, easy wiring, and good functional quality. When applied in the installation and maintenance process of relay protection, the utility model can greatly improve the working efficiency of the staff and reduce the workload of the staff. The use of the utility model makes the operation process of the relay protection standardized, the construction process is simple and clear, the polarity inspection accuracy of the current transformer reaches 100%, and the work efficiency is improved by about 50%; The correct action rate fundamentally avoids the occurrence of power grid or power equipment accidents and reduces economic losses.

本实用新型的电池采用可充电电池，既降低了本实用新型的制造成本，又节能环保。滑线变阻器的设置，能够根据电流互感器的型号以及电池的电压值进行适当调节，以使得指针式电流表的指针变化明显，对电流互感器的极性校验起到更明显的指示效果。The battery of the utility model adopts a rechargeable battery, which not only reduces the manufacturing cost of the utility model, but also saves energy and protects the environment. The setting of the sliding wire rheostat can be properly adjusted according to the model of the current transformer and the voltage value of the battery, so that the pointer of the pointer ammeter changes significantly, and has a more obvious indication effect on the polarity verification of the current transformer.

附图说明Description of drawings

图1：本实用新型的结构示意图。Fig. 1: Schematic diagram of the structure of the utility model.

图2：为本实用新型的使用状态的电路图。Fig. 2: is the circuit diagram of the use state of the utility model.

其中：1.壳体，2.面板，3.电池，4.开关，5.指针式电流表，6.接线端子，7.电阻，8.选择开关，9.调节旋钮。Among them: 1. Shell, 2. Panel, 3. Battery, 4. Switch, 5. Pointer ammeter, 6. Terminal block, 7. Resistor, 8. Selection switch, 9. Adjusting knob.

具体实施方式Detailed ways

下面结合附图和具体实施例对本实用新型作更进一步详细说明。Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

一种便携式电流互感器极性校验仪，其结构如图1所示。包括方形壳体1和面板2，面板与壳体相配装。壳体1内设置有电池3和电阻7，电池和电阻分别固定在壳体内的底板上。面板2上设置有指针式电流表5、开关4、调节旋钮9、选择开关8以及接线端子6，接线端子包括电流互感器一次侧接线端子P1、一次侧接线端子P2、二次侧接线端子T1以及二次侧接线端子T2。A portable current transformer polarity calibrator, the structure of which is shown in Figure 1. It includes a square casing 1 and apanel 2, and the panel is matched with the casing. The housing 1 is provided with abattery 3 and aresistor 7, and the battery and the resistor are respectively fixed on the bottom plate in the housing. Thepanel 2 is provided with a pointer ammeter 5, aswitch 4, an adjustment knob 9, aselector switch 8 and a connection terminal 6, and the connection terminals include a current transformer primary side connection terminal P1, a primary side connection terminal P2, a secondary side connection terminal T1 and Secondary side terminal T2.

本市实施例中电池采用三组的直流充电电池，电池组的选择开关设置在面板上，当采用一组直流充电电池时，将选择开关旋转到“1”档，当采用两组直流充电电池时，将选择开关旋转到“2”档，当采用三组直流充电电池时，则将选择开关旋转到“3”档。In the embodiment of this city, the battery adopts three groups of DC rechargeable batteries, and the selection switch of the battery group is set on the panel. , turn the selector switch to "2" gear, and when using three sets of DC rechargeable batteries, turn the selector switch to "3" gear.

电阻采用滑线变阻器，滑线变阻器的调节旋钮设置在面板上。滑线变阻器阻值大小的选择根据电池的电压值确定，当电池的电压值较高时，可通过顺时针方向旋转调节旋钮，将滑线变阻器的电阻值增大；当电池的电压值较低时，可通过向逆时针方向旋转调节旋钮，将滑线变阻器的电阻值减小，调节的标准以指针式电流表指针摆动的幅度为标准。通常指针式电流表指针的摆动幅度在指针式电流表满刻度一半以上时较好。The resistor adopts a sliding wire rheostat, and the adjustment knob of the sliding wire rheostat is set on the panel. The selection of the resistance value of the sliding wire rheostat is determined according to the voltage value of the battery. When the voltage value of the battery is high, the resistance value of the sliding wire rheostat can be increased by turning the adjustment knob clockwise; when the voltage value of the battery is low , the resistance value of the slide rheostat can be reduced by turning the adjusting knob counterclockwise, and the adjustment standard is the amplitude of the pointer swing of the pointer ammeter. Generally, the swing range of the pointer of the pointer ammeter is better when it is more than half of the full scale of the pointer ammeter.

本实施例的电路图如图2所示，下面根据图2描述本实施例中各部件间的连接关系。The circuit diagram of this embodiment is shown in FIG. 2 , and the connection relationship among the components in this embodiment will be described below based on FIG. 2 .

电池的正极依次经滑线变阻器、开关与一次侧接线端子P1连接，电池的负极直接与一次侧接线端子P2连接。指针式电流表的正极与二次侧接线端子T1连接，指针式电流表的负极与二次侧接线端子T2连接。The positive pole of the battery is connected to the primary side terminal P1 through the slide wire rheostat and the switch in turn, and the negative pole of the battery is directly connected to the primary side terminal P2. The positive pole of the pointer ammeter is connected to the secondary terminal T1, and the negative pole of the pointer ammeter is connected to the secondary terminal T2.

本实施例使用时，将电流互感器一次侧的两个引出端子分别与一次侧接线端子P1、一次侧接线端子P2连接，即将电流互感器一次侧的引出端子P1’与本实用新型面板上的一次侧接线端子P1短接，电流互感器一次侧的引出端子P2’与本实用新型面板上的一次侧接线端子P2短接；将电流互感器二次侧的两个引出端子分别连接与二次侧接线端子T1和二次侧接线端子T2连接，即将电流互感器二次侧的引出端子T1’与本实用新型面板上的二次侧接线端子T1连接，电流互感器二次侧的引出端子T2’与本实用新型面板上的二次侧接线端子T2连接。When this embodiment is used, the two lead-out terminals on the primary side of the current transformer are connected to the primary-side terminal P1 and the primary-side terminal P2 respectively, that is, the lead-out terminal P1' on the primary side of the current transformer is connected to the terminal P1' on the panel of the utility model. The primary side terminal P1 is short-circuited, and the lead-out terminal P2' of the primary side of the current transformer is short-circuited with the primary-side terminal P2 on the panel of the utility model; the two lead-out terminals of the secondary side of the current transformer are respectively connected to the secondary The terminal T1 on the secondary side is connected to the terminal T2 on the secondary side, that is, the lead-out terminal T1' on the secondary side of the current transformer is connected to the secondary-side connection terminal T1 on the panel of the utility model, and the lead-out terminal T2 on the secondary side of the current transformer 'Connect with the secondary terminal T2 on the panel of the utility model.

根据电流互感器的容量通过调节选择开关的位置，选择合适的电压值，并结合所选择电压值通过旋转调节旋钮合理选择滑线变阻器的阻值大小。According to the capacity of the current transformer, adjust the position of the selection switch to select the appropriate voltage value, and combine the selected voltage value by rotating the adjustment knob to reasonably select the resistance value of the slide wire rheostat.

检验结果为：瞬间合上开关，当指针式的指针式电流表正向偏转瞬间又马上返回时，说明电流互感器的一次侧引出端子和二次侧引出端子的极性标注准确，为同极性；安装时根据电流互感器标注的标准或者按照校验时的接线方式进行安装即可。当瞬间合上开关指针式电流表的指针反向偏转时，则表明电流互感器的一次侧引出端子和二次侧引出端子的极性标注相反，为异极性；安装时电流互感器二次侧引线端子的接线反向连接即可。The test result is: when the switch is turned on instantly, when the pointer ammeter deflects forward and then returns immediately, it means that the polarity markings of the primary side lead-out terminals and secondary side lead-out terminals of the current transformer are accurate, and they are of the same polarity ;Installation can be done according to the standard marked on the current transformer or according to the wiring method during calibration. When the pointer of the pointer ammeter is turned on in an instant and the switch is turned on in the opposite direction, it indicates that the polarity marks of the lead-out terminals on the primary side and the lead-out terminals on the secondary side of the current transformer are opposite, which are opposite polarities; when installing, the secondary side of the current transformer The wiring of the lead terminal can be connected in reverse.

Claims (3)

1. portable type current transformer polarity tester, comprise housing (1) and the panel (2) that is equipped with mutually with housing, it is characterized in that: be provided with battery (3) and resistance (7) in the described housing, be provided with indicator type current meter (5), switch (4) and connection terminal (6) on the panel, connection terminal comprises current transformer primary side connection terminal P1, primary side connection terminal P2, secondary side connection terminal T1 and secondary side connection terminal T2; The positive pole of described battery is connected with primary side connection terminal P1 through resistance, switch successively, and the negative pole of battery directly is connected with primary side connection terminal P2; The positive pole of described indicator type current meter is connected with secondary side connection terminal T1, and the negative pole of indicator type current meter is connected with secondary side connection terminal T2.

2. portable type current transformer polarity tester according to claim 1, it is characterized in that: described battery adopts two groups or more DC charging battery, and the selector switch of electric battery (8) is arranged on the panel.

3. portable type current transformer polarity tester according to claim 2, it is characterized in that: described resistance is rheochord, the adjusting knob of rheochord (9) is arranged on the panel.

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