电容式电压互感器校验及误差分析
发布时间：2018-09-17 19:47
【摘要】：随着经济飞速的发展,及产业结构的进一步升级,按照供给侧改革的要求,电力系统体制改革不断向前推进,售电公司的成立标志着电力工业发展迈入了新阶段。从发电厂到电网,再从电网到用户的电量计量结算的准确性牵扯到广大人民群众的切身利益,关系到电量交易的公平公正。其中发电企业上网电量的计量位于电力系统上游部分,具有电压等级高、技术复杂、计量额度大的特点,我们将其定义为一次计量关口点,是发电集团和供电公司开展大额电量交易业务的电能输送节点,是他们开展计量工作管理的重点。电能计量装置系统主要包含电压互感器(包含电磁式和电容式两种)、电流互感器、二次系统连接线及电能表等装置。其中电压互感器的作用是将一次电网高压转换为二次低压后接入电能表,因此保证整个电量计量系统准确的必要条件之一就是要保证电压互感器的准确度。随着电网电压等级的提升,电容式互感器取代了电磁式互感器,成为山东地区超高压以及特高压电网计量装置体系的主要装备。本文探讨了电容式电压互感器构成部分、工作原理及误差产生机理,介绍了电容式互感器现场校验工作的开展情况,分析进行现场校验时试验电源频率、外部环境温度、一次接线邻近效应、二次负载及外部电场对电容式电压互感器准确度产生的影响,并介绍了山东电网近年来电容式互感器现场校准超差的典型案例,详细阐述了电容式互感器误差超差后的分析过程和解决方案,为今后工作中再遇到电容式互感器误差超差的问题提供了分析方法和参考依据。在此基础上,电容式电压互感器的现场校验采用的电压谐振升压做了详细的介绍,展示了一整套根据此原理设计的现场校验成套设备。最后针对电压谐振升压校验设备的缺点,结合工作现场实际困难并提出了一种进一步缩减设备体积、提高校验设备集成化程度的改进方式:采取一种改进型高压试验变压器,通过中压绕组接入可调电抗器与被试互感器产生电流谐振消除无功,藉以降低升压器的负载及所试验电源容量,并能大幅度减小可调电抗器体积以实现整套设备进一步小型化,从而提高校验工作效率。
[Abstract]:With the rapid development of economy and the further upgrading of industrial structure, according to the demand of supply-side reform, the reform of power system is advancing continuously, and the establishment of power sale company marks the new stage of the development of electric power industry. The accuracy of electricity metering and settlement from power plant to power grid involves the vital interests of the broad masses of the people and relates to the fairness and fairness of electricity trading. The metering of power generation enterprises is located in the upstream part of the power system, which has the characteristics of high voltage grade, complex technology and large metering quota. It is the power transmission node that the generation group and the power supply company carry out the large quantity electricity transaction business, is the key point of their metering work management. The system of electric energy metering device mainly includes voltage transformer (including electromagnetic type and capacitive type), current transformer, secondary system connection wire and electric energy meter and so on. The function of the voltage transformer is to convert the primary power network high voltage to the secondary low voltage and connect to the energy meter. Therefore, one of the necessary conditions to ensure the accuracy of the whole electric quantity measurement system is to ensure the accuracy of the voltage transformer. With the improvement of power grid voltage, capacitive transformers have replaced electromagnetic transformers and become the main equipment of the metering device system of the ultra-high voltage and ultra high voltage power grid in Shandong area. This paper discusses the composition, working principle and error generation mechanism of capacitive voltage transformer, introduces the development of field calibration of capacitive transformer, analyzes the frequency of test power supply and the temperature of external environment during field calibration. The influence of proximity effect of primary connection, secondary load and external electric field on the accuracy of capacitive voltage transformer is introduced. The typical cases of field calibration of capacitive transformer in Shandong Power Grid in recent years are introduced. In this paper, the analysis process and solution of capacitance transformer error deviation are described in detail, which provides the analysis method and reference basis for the problem of capacitance transformer error exceeding error in the future work. On this basis, the voltage resonance boost used in field calibration of capacitive voltage transformer is introduced in detail, and a complete set of field calibration equipment designed according to this principle is presented. Finally, aiming at the shortcomings of voltage resonance voltage booster calibration equipment and combining the practical difficulties in the work site, an improved method of further reducing the volume of the equipment and increasing the integration of the calibration equipment is put forward: a kind of improved high voltage test transformer is adopted. In order to reduce the load of the booster and the capacity of the tested power supply, the adjustable reactor volume can be greatly reduced to realize the further miniaturization of the whole equipment by connecting the adjustable reactor with the tested transformer to produce current resonance to eliminate reactive power, so as to reduce the load of the booster and the capacity of the tested power supply. In order to improve the efficiency of calibration work.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM451.2
[Abstract]:With the rapid development of economy and the further upgrading of industrial structure, according to the demand of supply-side reform, the reform of power system is advancing continuously, and the establishment of power sale company marks the new stage of the development of electric power industry. The accuracy of electricity metering and settlement from power plant to power grid involves the vital interests of the broad masses of the people and relates to the fairness and fairness of electricity trading. The metering of power generation enterprises is located in the upstream part of the power system, which has the characteristics of high voltage grade, complex technology and large metering quota. It is the power transmission node that the generation group and the power supply company carry out the large quantity electricity transaction business, is the key point of their metering work management. The system of electric energy metering device mainly includes voltage transformer (including electromagnetic type and capacitive type), current transformer, secondary system connection wire and electric energy meter and so on. The function of the voltage transformer is to convert the primary power network high voltage to the secondary low voltage and connect to the energy meter. Therefore, one of the necessary conditions to ensure the accuracy of the whole electric quantity measurement system is to ensure the accuracy of the voltage transformer. With the improvement of power grid voltage, capacitive transformers have replaced electromagnetic transformers and become the main equipment of the metering device system of the ultra-high voltage and ultra high voltage power grid in Shandong area. This paper discusses the composition, working principle and error generation mechanism of capacitive voltage transformer, introduces the development of field calibration of capacitive transformer, analyzes the frequency of test power supply and the temperature of external environment during field calibration. The influence of proximity effect of primary connection, secondary load and external electric field on the accuracy of capacitive voltage transformer is introduced. The typical cases of field calibration of capacitive transformer in Shandong Power Grid in recent years are introduced. In this paper, the analysis process and solution of capacitance transformer error deviation are described in detail, which provides the analysis method and reference basis for the problem of capacitance transformer error exceeding error in the future work. On this basis, the voltage resonance boost used in field calibration of capacitive voltage transformer is introduced in detail, and a complete set of field calibration equipment designed according to this principle is presented. Finally, aiming at the shortcomings of voltage resonance voltage booster calibration equipment and combining the practical difficulties in the work site, an improved method of further reducing the volume of the equipment and increasing the integration of the calibration equipment is put forward: a kind of improved high voltage test transformer is adopted. In order to reduce the load of the booster and the capacity of the tested power supply, the adjustable reactor volume can be greatly reduced to realize the further miniaturization of the whole equipment by connecting the adjustable reactor with the tested transformer to produce current resonance to eliminate reactive power, so as to reduce the load of the booster and the capacity of the tested power supply. In order to improve the efficiency of calibration work.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM451.2
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