CN105699929A - Equivalent leakage current error influence test device and test method thereof - Google Patents
Equivalent leakage current error influence test device and test method thereof Download PDFInfo
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Abstract
本发明涉及一种等效泄漏电流误差影响试验装置及其试验方法，装置包括调压器、试验变压器、标准互感器、CVT试品以及电阻体；电源电压通过试验变压器和限流电阻接入标准电容式电压互感器和CVT试品的一次侧；试验变压器的原边与调压器连接，副边的一端接地，另一端与限流电阻的一端连接；限流电阻的另一端分别与标准电压互感器的一次侧和CVT试品的一次侧连接；标准电容式电压互感器的二次侧和CVT试品的二次侧均与互感器校验仪连接；所述电阻体并联在CVT试品的单节电容器单元两端，以模拟等效泄漏电流。本发明成功模拟了CVT分别在因雨水、灰尘等产生的泄漏电流情况，并验证了CVT在该种情况下其准确度依然能够达到高精度准确度等级的要求。
The invention relates to a test device for the influence of an equivalent leakage current error and a test method thereof. The device includes a voltage regulator, a test transformer, a standard transformer, a CVT test product and a resistor; the power supply voltage is connected to the standard through the test transformer and the current limiting resistor The primary side of the capacitive voltage transformer and the CVT test object; the primary side of the test transformer is connected to the voltage regulator, one end of the secondary side is grounded, and the other end is connected to one end of the current-limiting resistor; the other end of the current-limiting resistor is connected to the standard voltage The primary side of the transformer is connected to the primary side of the CVT sample; the secondary side of the standard capacitive voltage transformer and the secondary side of the CVT sample are both connected to the transformer calibrator; the resistor is connected in parallel to the CVT sample across the single-cell capacitor unit to simulate the equivalent leakage current. The invention successfully simulates the leakage current of the CVT caused by rain, dust, etc., and verifies that the accuracy of the CVT in this case can still meet the requirement of high-precision accuracy level.
Description
技术领域technical field
本发明涉及一种电力系统互感器装置及其方法，具体讲涉及一种等效泄漏电流误差影响试验装置及其试验方法。The invention relates to a power system transformer device and a method thereof, in particular to an equivalent leakage current error influence test device and a test method thereof.
背景技术Background technique
随着特高压(交流1000kV及以上)输电技术的工程应用，特高压电网电压的准确测量成为有待研究解决的关键技术问题。电力系统广泛应用的工频高电压测量装置主要有电磁式电压互感器和电容式电压互感器两种(两者均属于无源电压测量系统)，基本上能够满足500kV及以下电压等级电压计量和继电保护的要求。光电式电压互感器、电子式电压互感器(均属于有源电压测量系统)目前还处在研发和试运行过程中，尚有电压测量精度、激光器寿命、系统可靠性等问题需进一步研究解决，尚未获得规模应用。With the engineering application of UHV (AC 1000kV and above) transmission technology, the accurate measurement of UHV grid voltage has become a key technical problem to be studied and solved. The power frequency high voltage measurement devices widely used in the power system mainly include electromagnetic voltage transformers and capacitive voltage transformers (both of which are passive voltage measurement systems), which can basically meet the requirements of 500kV and below voltage level voltage measurement and Requirements for relay protection. Photoelectric voltage transformers and electronic voltage transformers (both of which are active voltage measurement systems) are still in the process of research and development and trial operation. There are still issues such as voltage measurement accuracy, laser life, and system reliability that need further research and resolution. Has not yet been applied on a large scale.
当进入超/特高压等级，电磁式电压互感器由于绝缘困难已很少采用。电容式电压互感器(CVT)由于结构简单、可靠性高、造价较低，仍是超/特高压等级电网电压测量的主要设备。但是，现有CVT的设计应用于特高压电网，遇到了如下的技术困难：When entering the EHV/UHV level, electromagnetic voltage transformers are rarely used due to insulation difficulties. Due to its simple structure, high reliability and low cost, capacitive voltage transformer (CVT) is still the main equipment for voltage measurement of EHV/UHV power grids. However, the existing CVT design is applied to the UHV power grid, and encounters the following technical difficulties:
1)杂散电容电流影响测量准确度：1) Stray capacitance current affects measurement accuracy:
传统的电容式电压互感器(CVT)，由于电容分压器高压臂与周围的接地体或带电体之间存在杂散电容，在高电压作用下，杂散电容电流流出或流入高压臂，导致电压测量误差。这种误差随着电压等级的增高而加大。我国西北750kV电网电容式电压互感器实测结果，杂散电流(包括电容电流和绝缘套表面泄漏电流)引起的测量误差可高达0.2％以上。电场仿真表明，1000kV的CVT，从分压器高压臂流入大地的电容电流可达20mA，造成显著的测量误差。通常采用加大分压器主电容量的措施来减少杂散电流的影响，但即使电容量增大到10000pf，特高压CVT的准确级也难达到0.1级的标准。In the traditional capacitive voltage transformer (CVT), due to the stray capacitance between the high-voltage arm of the capacitor voltage divider and the surrounding grounding body or charged body, under the action of high voltage, the stray capacitance current flows out or flows into the high-voltage arm, resulting in Voltage measurement error. This error increases as the voltage level increases. According to the actual measurement results of capacitive voltage transformers in the 750kV power grid in Northwest my country, the measurement error caused by stray currents (including capacitive currents and surface leakage currents of insulating sleeves) can be as high as 0.2%. Electric field simulation shows that for a 1000kV CVT, the capacitive current flowing from the high-voltage arm of the voltage divider into the ground can reach 20mA, causing significant measurement errors. Usually, the measure of increasing the main capacitance of the voltage divider is adopted to reduce the influence of stray current, but even if the capacitance is increased to 10000pf, the accuracy level of UHV CVT is still difficult to reach the standard of 0.1 level.
2)现场效验困难：2) On-site verification is difficult:
现有CVT测量误差受杂散电容影响因而与安装位置有关。超/特高压电压等级的CVT在现场安装后，需要进行现场效验，以便修正出厂时测定的比差和角差。在特高压变电站进行互感器的现场效验绝非易事。除了特高压标准电容器制造难度外、特高压变电站现场的电磁干扰也是进行现场准确效验比对的重要制约因素。Existing CVT measurement errors are affected by stray capacitance and thus are related to the installation location. After the CVT of EHV/UHV voltage level is installed on site, on-site verification is required in order to correct the ratio difference and angle difference measured at the factory. It is not easy to carry out the field test of transformers in UHV substations. In addition to the difficulty of manufacturing UHV standard capacitors, the electromagnetic interference at the UHV substation site is also an important constraint factor for accurate on-site comparisons.
3)CVT响应特性问题：3) CVT response characteristic problem:
数字化继电保护系统的广泛应用对电压互感器的响应特性提出了越来越高的要求，要求互感器次级电压应快速准确反映初级电压的变化。有关规程要求，互感器初级对地短路后，次级电压应在0.2秒以内降至初始值的0.1以下。现有CVT均采用储能元件组成的铁磁谐振阻尼器，以抑制电磁单元中可能产生的铁磁谐振。储能元件的引入使互感器的响应特性变差，难以满足特高压电网继电保护快速准确动作的要求。目前尚没有对于电容式电压互感器进行的等效泄漏电流误差影响试验方法，本试验方法为首例。The wide application of digital relay protection system puts forward higher and higher requirements on the response characteristics of voltage transformers, requiring that the secondary voltage of transformers should reflect the changes of primary voltage quickly and accurately. Relevant regulations require that after the transformer primary is short-circuited to ground, the secondary voltage should drop below 0.1 of the initial value within 0.2 seconds. Existing CVTs all use ferromagnetic resonance dampers composed of energy storage elements to suppress ferromagnetic resonance that may occur in the electromagnetic unit. The introduction of energy storage components makes the response characteristics of the transformer worse, and it is difficult to meet the requirements of fast and accurate action of UHV power grid relay protection. At present, there is no test method for the influence of equivalent leakage current error on capacitive voltage transformers, and this test method is the first case.
发明内容Contents of the invention
针对现有技术的不足，本发明的目的是提供一种等效泄漏电流误差影响试验装置及其试验方法，成功模拟了CVT分别在因雨水、灰尘等产生的泄漏电流情况，并验证了CVT在该种情况下其准确度依然能够达到高精度准确度等级的要求，并且在上述情况下产生的误差变化小于传统结构CVT。Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a kind of equivalent leakage current error influence test device and its test method, which successfully simulates the leakage current situation of CVT due to rainwater, dust, etc. In this case, its accuracy can still meet the requirements of high-precision accuracy level, and the error variation generated in the above-mentioned cases is smaller than that of the traditional structure CVT.
本发明的目的是采用下述技术方案实现的：The object of the present invention is to adopt following technical scheme to realize:
本发明提供一种等效泄漏电流误差影响试验装置，其改进之处在于，所述装置包括调压器、试验变压器、标准互感器、等电位屏蔽电容式电压互感器试品以及电阻体；电源电压通过试验变压器和限流电阻接入标准电容式电压互感器和等电位屏蔽电容式电压互感器试品的一次侧；试验变压器的原边与调压器连接，副边的一端接地，另一端与限流电阻的一端连接；限流电阻的另一端分别与标准电压互感器的一次侧和等电位屏蔽电容式电压互感器试品的一次侧连接；所述标准电容式电压互感器的二次侧和等电位屏蔽电容式电压互感器试品的二次侧均与互感器校验仪连接；所述电阻体并联在等电位屏蔽电容式电压互感器试品的单节电容器单元两端，以模拟等效泄漏电流。The invention provides an equivalent leakage current error influence test device, which is improved in that the device includes a voltage regulator, a test transformer, a standard transformer, an equipotential shielding capacitive voltage transformer test sample and a resistor body; a power supply The voltage is connected to the primary side of the standard capacitive voltage transformer and equipotential shielding capacitive voltage transformer through the test transformer and current-limiting resistor; the primary side of the test transformer is connected to the voltage regulator, one end of the secondary side is grounded, and the other end connected to one end of the current limiting resistor; the other end of the current limiting resistor is respectively connected to the primary side of the standard voltage transformer and the primary side of the equipotential shielding capacitor voltage transformer test sample; the secondary side of the standard capacitor voltage transformer side and the secondary side of the equipotential shielding capacitive voltage transformer test sample are connected to the transformer calibrator; Simulate equivalent leakage current.
进一步地，所述调压器、标准电容式电压互感器、等电位屏蔽电容式电压互感器试品和邻近接地体均接地。Further, the voltage regulator, the standard capacitive voltage transformer, the equipotential shielding capacitive voltage transformer test sample and the adjacent grounding body are all grounded.
进一步地，所述电阻体与等电位屏蔽电容式电压互感器试品的单节等电位屏蔽电容器单元并联方式包括：Further, the parallel connection of the resistor body and the single equipotential shielding capacitor unit of the equipotential shielding capacitive voltage transformer test product includes:
等电位屏蔽电容式电压互感器试品的每节电容器单元均并联电阻体；Each capacitor unit of the equipotential shielding capacitive voltage transformer test product is connected in parallel with a resistor;
等电位屏蔽电容式电压互感器试品的第一节电容器单元并联电阻体；The parallel resistor body of the capacitor unit of the first section of the equipotential shielding capacitive voltage transformer test product;
等电位屏蔽电容式电压互感器试品的第二节电容器单元并联电阻体。The second capacitor unit of the equipotential shielding capacitive voltage transformer test product is connected in parallel with the resistor body.
进一步地，所述电阻体的两端分别固定连接在每节等电位屏蔽电容器单元复合绝缘套管的两端法兰上。Further, the two ends of the resistor body are respectively fixedly connected to the flanges at both ends of the composite insulating bushing of each equipotential shielding capacitor unit.
进一步地，所述电阻体由电阻器先串后并的方式组成，电阻体的阻值根据所需模拟等效泄漏电流的大小进行配置，等效泄露电流短时峰值在30-50mA之间；所述电阻器采用高压电阻；高压电阻的电压需配合具体试验电压。Further, the resistor body is composed of resistors in series first and then in parallel, the resistance value of the resistor body is configured according to the size of the required simulated equivalent leakage current, and the short-term peak value of the equivalent leakage current is between 30-50mA; The resistor is a high-voltage resistor; the voltage of the high-voltage resistor needs to match the specific test voltage.
进一步地，测量电源电压的电容式电压互感器距离与等电位屏蔽电容式电压互感器试品足够远(此处的距离要求以对试品无干扰为依据，避免由于试品周围的物体由于距离试品过近从而对试品的试验结果产生干扰)，等电位屏蔽电容式电压互感器试品距离试验变压器足够远，以减少相互之间的干扰；所述等电位屏蔽电容式电压互感器误差测量参照JJG314-2010中测量用电压互感器检定规程。Further, the distance between the capacitive voltage transformer for measuring the power supply voltage and the equipotential shielding capacitive voltage transformer test object is far enough (the distance requirement here is based on no interference to the test object, to avoid objects around the test object due to distance The test product is too close to interfere with the test results of the test product), the equipotential shielding capacitive voltage transformer test product is far enough away from the test transformer to reduce mutual interference; the equipotential shielding capacitive voltage transformer error The measurement refers to the verification regulations of voltage transformers for measurement in JJG314-2010.
本发明还提供一种等效泄漏电流误差影响试验装置的试验方法，其改进之处在于，所述方法在等电位屏蔽电容式电压互感器试品的单节电容器单元两端并联电阻体，以等效模拟由雨水和灰尘在等电位屏蔽电容式电压互感器试品表面产生的泄漏电流。The present invention also provides a test method for an equivalent leakage current error influence test device, the improvement of which is that the method connects resistors in parallel at both ends of a single-section capacitor unit of an equipotential shielding capacitive voltage transformer test product, so as to Equivalent simulation of the leakage current generated by rain and dust on the surface of the equipotential shielding capacitive voltage transformer test object.
进一步地，所述电阻体与等电位屏蔽电容式电压互感器试品的单节电容器单元并联方式包括：Further, the parallel connection of the resistor body and the single capacitor unit of the equipotential shielding capacitive voltage transformer test product includes:
等电位屏蔽电容式电压互感器试品的每节电容器单元均并联电阻体；Each capacitor unit of the equipotential shielding capacitive voltage transformer test product is connected in parallel with a resistor;
等电位屏蔽电容式电压互感器试品的第一节电容器单元并联电阻体；The parallel resistor body of the capacitor unit of the first section of the equipotential shielding capacitive voltage transformer test product;
等电位屏蔽电容式电压互感器试品的第二节电容器单元并联电阻体。The second capacitor unit of the equipotential shielding capacitive voltage transformer test product is connected in parallel with the resistor body.
进一步地，将所述电阻体的两端分别固定连接在每节电容器单元复合绝缘套管的两端法兰上。Further, the two ends of the resistor body are respectively fixedly connected to the flanges at both ends of the composite insulating casing of each capacitor unit.
进一步地，所述电阻体由电阻器先串后并的方式组成，电阻体的阻值根据所需模拟等效泄漏电流的大小进行配置，等效泄露电流短时峰值在30-50mA之间；所述电阻器采用高压电阻；高压电阻的电压需配合具体试验电压。Further, the resistor body is composed of resistors in series first and then in parallel, the resistance value of the resistor body is configured according to the size of the required simulated equivalent leakage current, and the short-term peak value of the equivalent leakage current is between 30-50mA; The resistor is a high-voltage resistor; the voltage of the high-voltage resistor needs to match the specific test voltage.
与现有技术比，本发明达到的有益效果是：Compared with prior art, the beneficial effect that the present invention reaches is:
本发明提供的等效泄漏电流误差影响试验装置及其试验方法，成功模拟了CVT分别在因雨水、灰尘等产生的泄漏电流情况，并验证了CVT在该种情况下其准确度依然能够达到高精度准确度等级的要求，并且在上述情况下产生的误差变化小于传统结构CVT。The equivalent leakage current error influence test device and test method thereof provided by the present invention have successfully simulated the leakage current conditions of the CVT caused by rainwater, dust, etc., and verified that the accuracy of the CVT in this case can still reach high The requirements of the precision accuracy level, and the error change produced in the above situation is smaller than that of the traditional structure CVT.
本发明提供的试验方法可根据试验要求改变电源电压等级(本次试验采用1000kV电压等级)，可根据试验现场情况以及实际运行情况改变并联与电容器单元两端的电阻体的电阻值大小，以改变所模拟的互感器表面的泄漏电流大小，可根据情况改变并联与电容器两端的电阻体的数量和并联方式，以模拟不同单元上的泄漏电流情况。本发明降低了试验难度，提高了可操作性并能与传统结构的CVT在相同情况进行下对比分析。The test method provided by the present invention can change the power supply voltage level (this test adopts 1000kV voltage level) according to the test requirements, and can change the resistance value of the resistor body connected in parallel with the two ends of the capacitor unit according to the test site situation and actual operation conditions, so as to change the The leakage current on the surface of the simulated transformer can be changed according to the situation, and the number and parallel connection mode of the resistors connected in parallel with the two ends of the capacitor can be changed to simulate the leakage current on different units. The invention reduces the difficulty of the test, improves the operability and can be compared and analyzed with the CVT of the traditional structure under the same conditions.
附图说明Description of drawings
图1是本发明提供的等效泄漏电流误差影响试验装置接线图；Fig. 1 is the wiring diagram of the equivalent leakage current error impact test device provided by the present invention;
图2是本发明提供的电阻体示意图，其中图(a)为电阻体连接方式I：每节电容器单元均并联一个电阻体，图(b)电阻体连接方式II：仅第一节电容器单元并联电阻体，图(c)电阻体连接方式III：仅第二节电容器单元并联电阻体，图(d)单节电阻体，Ra-Rd为电阻体，每节电阻体由若干支电阻器串、并联组成；R1-R6为电阻器；Fig. 2 is a schematic diagram of the resistor body provided by the present invention, wherein figure (a) is resistor body connection mode I: each capacitor unit is connected in parallel with a resistor body, and figure (b) resistor body connection mode II: only the first capacitor unit is connected in parallel Resistor, Figure (c) Resistor connection method III: Only the second capacitor unit is connected in parallel with the resistor, Figure (d) is a single resistor, Ra-Rd is a resistor, and each resistor is composed of several resistors in series, Composed in parallel; R1-R6 are resistors;
图3是本发明提供的安装后的电阻体示意图。Fig. 3 is a schematic diagram of the mounted resistor body provided by the present invention.
具体实施方式detailed description
下面结合附图对本发明的具体实施方式作进一步的详细说明。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
本发明提供一种等效泄漏电流误差影响试验装置，该装置包括调压器T1、试验变压器、标准互感器、等电位屏蔽电容式电压互感器试品以及电阻体；电源电压通过试验变压器T2和限流电阻接入标准电容式电压互感器和等电位屏蔽电容式电压互感器试品的一次侧；试验变压器T2的原边与调压器T1连接，副边的一端接地，另一端与限流电阻R的一端连接；限流电阻R的另一端分别与标准电压互感器的一次侧和等电位屏蔽电容式电压互感器试品的一次侧连接；所述标准电容式电压互感器的二次侧和等电位屏蔽电容式电压互感器试品的二次侧均与互感器校验仪连接；所述电阻体并联在等电位屏蔽电容式电压互感器试品的单节电容器单元两端，以模拟等效泄漏电流。所述调压器T1、标准电容式电压互感器、等电位屏蔽电容式电压互感器试品和邻近接地体均接地。The invention provides an equivalent leakage current error influence test device, which includes a voltage regulator T 1 , a test transformer, a standard transformer, an equipotential shielding capacitive voltage transformer test sample and a resistor body; the power supply voltage passes through the test transformer T 2 and the current-limiting resistor are connected to the primary side of the standard capacitive voltage transformer and equipotential shielding capacitive voltage transformer ; the primary side of the test transformer T2 is connected to the voltage regulator T1, one end of the secondary side is grounded, and the other side is grounded. One end is connected to one end of the current-limiting resistor R; the other end of the current-limiting resistor R is respectively connected to the primary side of the standard voltage transformer and the primary side of the equipotential shielding capacitor voltage transformer test sample; the standard capacitor voltage transformer Both the secondary side of the equipotential shielding capacitive voltage transformer test sample and the secondary side of the equipotential shielding capacitive voltage transformer test sample are connected to the transformer calibrator; terminal to simulate the equivalent leakage current. The voltage regulator T 1 , the standard capacitive voltage transformer, the equipotential shielding capacitive voltage transformer test sample and the adjacent grounding body are all grounded.
根据选择电阻体的并联数量和并联方式如图2(a)、(b)、(c)，以模拟各种工况下的互感器等效泄漏电流值，所述电阻体与等电位屏蔽电容式电压互感器试品的单节电容器单元并联方式包括：According to the parallel connection number and parallel connection mode of selected resistors as shown in Figure 2 (a), (b), (c), to simulate the equivalent leakage current value of the transformer under various working conditions, the resistors and the equipotential shielding capacitor The parallel connection mode of the single capacitor unit of the type voltage transformer test product includes:
等电位屏蔽电容式电压互感器试品的每节电容器单元均并联电阻体；Each capacitor unit of the equipotential shielding capacitive voltage transformer test product is connected in parallel with a resistor;
等电位屏蔽电容式电压互感器试品的第一节电容器单元并联电阻体；The parallel resistor body of the capacitor unit of the first section of the equipotential shielding capacitive voltage transformer test product;
等电位屏蔽电容式电压互感器试品的第二节电容器单元并联电阻体。The second capacitor unit of the equipotential shielding capacitive voltage transformer test product is connected in parallel with the resistor body.
所述电阻体的两端分别固定连接在每节电容器单元复合绝缘套管的两端法兰上。The two ends of the resistor body are respectively fixedly connected to the flanges at both ends of the composite insulating bushing of each capacitor unit.
所述电阻体由电阻器先串后并的方式组成，电阻体的阻值根据所需模拟等效泄漏电流的大小进行配置，等效泄露电流短时峰值在30-50mA之间；所述电阻器采用高压电阻；高压电阻的电压需配合具体试验电压，如图2(d)所示。The resistor body is composed of resistors in series first and then in parallel, the resistance of the resistor body is configured according to the size of the required simulated equivalent leakage current, and the short-term peak value of the equivalent leakage current is between 30-50mA; the resistor The device adopts high-voltage resistors; the voltage of the high-voltage resistors needs to match the specific test voltage, as shown in Figure 2(d).
本发明提供的装置通过并联电阻体的方式等效模拟由雨水和灰尘等在CVT表面产生的泄漏电流，以此降低试验难度，提高可操作性。试验接线图如图1所示，电阻体示意图如图2所示。The device provided by the invention equivalently simulates the leakage current generated by rainwater and dust on the surface of the CVT by connecting resistors in parallel, so as to reduce the difficulty of the test and improve the operability. The test wiring diagram is shown in Figure 1, and the schematic diagram of the resistor body is shown in Figure 2.
测量电源电压的标准电容式电压互感器距离与等电位屏蔽电容式电压互感器试品足够远，等电位屏蔽电容式电压互感器试品距离试验变压器足够远，以减少相互之间的干扰(此处的距离要求以对试品无干扰为依据，避免由于试品周围的物体由于距离试品过近从而对试品的试验结果产生干扰)；所述等电位屏蔽电容式电压互感器误差测量方法参照JJG314-2010中测量用电压互感器检定规程。The distance between the standard capacitive voltage transformer for measuring the power supply voltage and the equipotential shielding capacitive voltage transformer test sample is far enough, and the equipotential shielding capacitive voltage transformer test sample is far enough away from the test transformer to reduce mutual interference (this The distance requirement at the test object is based on no interference to the test object, to avoid interference with the test results of the test object due to the objects around the test object being too close to the test object); the equipotential shielding capacitive voltage transformer error measurement method Refer to the verification regulations for measuring voltage transformers in JJG314-2010.
本发明还提供一种等效泄漏电流误差影响试验装置的试验方法，该方法在等电位屏蔽电容式电压互感器试品的单节电容器单元两端并联电阻体，以等效模拟由雨水和灰尘在等电位屏蔽电容式电压互感器试品表面产生的泄漏电流。The present invention also provides a test method for the influence of the equivalent leakage current error on the test device. In the method, resistors are connected in parallel at both ends of the single-section capacitor unit of the equipotential shielding capacitive voltage transformer test product to equivalently simulate the leakage caused by rainwater and dust. The leakage current generated on the surface of the equipotential shielding capacitive voltage transformer test object.
本发明提供的试验方法成功模拟了CVT分别在因雨水、灰尘等产生的泄漏电流情况，并验证了CVT在该种情况下其准确度依然能够达到高精度准确度等级的要求，并且在上述情况下产生的误差变化小于传统结构CVT。本试验方法在国内外对CVT的试验中尚属首次运用。The test method provided by the present invention has successfully simulated the leakage current situation of the CVT due to rainwater, dust, etc. The error variation generated under the system is smaller than that of the traditional structure CVT. This test method is used for the first time in the test of CVT at home and abroad.
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员依然可以对本发明的具体实施方式进行修改或者等同替换，这些未脱离本发明精神和范围的任何修改或者等同替换，均在申请待批的本发明的权利要求保护范围之内。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still implement the present invention Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention is within the protection scope of the claims of the pending application of the present invention.
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