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双语推荐：阻性电流检测

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针对目前没有统一方法对阻性电流测试结果进行有效诊断的现状,分析金属氧化物避雷器(MOA)阻性电流检测方法及适用条件,提出一种MOA状态诊断新方法,分析利用阻性电流与全电流比例关系,电流超前电压角度,谐波数据变化及结合红外测温、高频局部放电试验对阻性电流测试结果进行综合诊断的过程,并通过应用实例验证了该方法的有效性。
In order to obtain a general method to diagnose the results of resistive current test of metal oxide arresters (MOA)effectively,a new comprehensive diagnosing meth-od is proposed in this paper,the MOA on-line testing new method is advanced,base on the consideration of the propor-tional relationship between resistive current and leakage cur-rent,the advance angle of current to voltage,and the har-monic variation,the results of infrared thermometry and high-frequency partial discharge test.Through the actual ap-plication verification,the method is effective.

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以微处理器MSP430为核心,由泄漏电流采集、雷击计数脉冲、无线收/发控制、LCD显示等电路组成,设计了一种金属氧化锌避雷器(MOA)阻性漏电流在线检测系统.系统通过对MOA阻性漏电流的实时检测,并将检测结果发射到终端监控中心,实现对MOA运行状态的在线监测.
A kind of monitoring system for MOA ( Metal-oxide surge Arrester ) resistance leakage current was de-signed.In the design, the chip MSP430 is used as the controller .The system was consisted of the acquisition of leak-age current ,the count pulse of lightning arrester ,wireless receiving /transmitting control ,LCD display and so on .The on-line monitoring of MOA can be effectively realized by real-time detecting the resistive leakage current of MOA , and sending it to the RF receive device by wireless .

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分析了电网高压避雷器存在的安全隐患,对阻性泄漏电流进行了风险辨识,提出了改善现有泄漏电流检测方法、集中自动在线监视等措施,促进了电网、变电站以及高压用电场所安全、可靠和经济运行。
The hidden danger existing in power grid high-voltage lightning arrester was analysed, and risk identification for resistive leakage current was made. Corresponding measures,including improving the current detection method for leakge current and centralizing automatic on-line monitoring etc.,were put forward to promote the safe,reliable and economic operation of substations and high-voltage power utilizing sites.

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提出了一种双惠斯通桥差模电路的磁阻传感器电流测量新方法。本方法采用通用低成本磁阻传感器,相对于目前主流的电流检测技术具有抗干扰能力强、可靠、易于实现二次封装与板级应用、性价比高、测量范围广、温度漂移低的优点。本文详细介绍了系统的设计思想与结构,分析了系统工作原理,并通过实验数据验证了该方法的可靠性和稳定性。
This paper proposes a novel method for current measurement using dual-Wheatstone bridge differential mode current. Compared with existing non-contact current detection systems, the proposed method is robust against inference, reliable, easy to be repackaged and applied at board-level, low-cost, and with a wide measuring range and low temperature drift. The article also illustrates the design and structure of the system, analyzes the working principle, and verifies the reliability and stability of the method by experimental data.

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在金属氧化物避雷器状态检测技术的研究基础上,研制了一种智能化的避雷器在线监测器,并建立了金属氧化物避雷器的状态监测系统。在线监测器可以记录避雷器动作电流幅值、极性、次数和发生时间,显示全电流及阻性电流峰值、功率损耗,通过蓝牙通讯方式接收测试数据,按照综合温度因子的统一判据,对测试数据进行分析归纳,并能自动显示预警信息,从而实现避雷器的状态检修。
Through the study of state detection technology for metal oxide arrester, we developed an on-line intelligent monitor for arrester. The on-line monitor can record the amplitude of arrester action lightning current, current polarity, frequency, occurrence time and also can display the full current and the peak of resistive current, and power loss. An on-line diagnose system for metallic oxide arrester was established, and it used bluetooth communication to receive test data, and the test data was analyzed ac-cording to a unified criterion of temperature factor, then it can automatically display the warning informa-tion, thus realize the state maintenance of arrester.

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配电线路负荷率快速增加和电缆线路的广泛应用使得配电网中性点有效接地方式得到越来越多的应用。中性点有效接地配电线路受送电走廊、自然环境等因素影响,容易发生弧光高阻接地故障;此类故障电流幅值小,保护难以检测跳闸,很少能获取到现场录波数据;而人工接地试验成本高,难以频繁使用,因此挖掘有限的试验数据,实现弧光高阻接地模型的精确建模尤为重要。文中在详细分析基于热平衡原理的电弧模型机理的基础上,指出了该类模型不完全适用于开放空间,以及弱故障电流的高阻弧光接地故障。针对以上问题,文中基于固体介质电击穿原理,提出并建立了配电线路高阻接地故障点非线性电阻模型,理论分析及现场试验数据验证了模型的准确性;为后续的高阻接地故障检测算法研究奠定了理论基础。
The rapid increase of distribution feeder loading and the wider application of cables requires more frequent usage of effective neutral point grounding.High impedance faults(HIFs)often occur in effectively grounded distribution systems.They exhibit limited fault current which can be too small to be identified by conventional overcurrent relays.HIFs data is always beyond reach due to the poor action of existing relays;therefore,artificial fault experiment becomes a main approach to obtain fault data.However,the experiment is costly and limited to several fault surfaces.Modeling study provides an economical and flexible way for HIFs detection and provides better understanding of HIFs.Existing HIF models are mostly associated with arc,and are not always suitable for small current and open air HIFs.Several existing HIF models are analyzed in detail.Based on the solid dielectric electrical breakdown theory,a nonlinear fault model is proposed.The model is verified by artificial experiment da

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为了提高孤岛检测速率,改善并网电流波形质量,在传统AFD扰动方式基础上提出了一种新的改进型电流扰动策略。对传统AFD而言,截断系数cf越大则电流畸变率越大,而cf较小则检测效率降低。因此,如何在孤岛检测效率与电流畸变之间取得良好平衡是孤岛检测问题中的难点。所提出的电流扰动法对并网电流施以变步长cf扰动,能有效改善稳定电流波形THD,同时在负半波加强扰动量能提高检测速率。理论分析与仿真试验均验证了该新型扰动策略的正确性和可靠性。
To improve the efficiency of island detection and the quality of current waveform, a new current disturbance strategy is proposed based on the traditional AFD. As to the traditional AFD, the rising of chopping fraction (cf) leads to more current distortion and the smaller cf resulted in low efficiency of island detection. Therefore, it’s difficult to achieve good balance between the efficiency of island detection and current distortion in anti-islanding detection. Now the proposed current perturbation method can effectively improve the THD of stable current by applying variable step disturbance on grid current. And the new method also improves the rate of detection by strengthening disturbance in negative half wave. Theoretical analysis and simulation experiment prove the validity and reliability of the strategy.

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本文基于火花塞离子电流检测技术设计了发动机点火控制电路和发动机离子电流检测电路。点火控制电路主要通过编程模拟发动机的点火过程,离子电流检测电路主要完成对火花塞两极之间离子电流信号进行采集放大的工作,以便处理和分析。该检测仪的最大特点是在不需要特殊的传感器的情况下进行能够方便的进行检测。
This article is based on the spark plug ion current detection technology and designs the engine ignition control circuit and ion current detection circuit.Ignition control circuit mainly simulates engine ignition process by programming, Ion current detection circuit is mainly completed the acquisition and ampliifcation of ion current signal spark plug between the poles,so that the processing and analysis are convenient.The most obvious characteristic of the detector is that it can be convenient for testing in the case of no special sensors.

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末端剩余电流动作保护在建筑工程低压配电系统剩余电流分级动作保护中尤为重要。本文针对末端剩余电流动作保护可靠性现场检测普遍欠缺的现状，阐述了末端剩余电流动作保护原理及现场检测的重要性，提出了三种现场检测方法，并指出各自的特点和适用范围，最后以工程实例验证了现场检测方法的方便实用性。
The end residual current operated protection is very important in the classified residual current operated protection of the Low-voltage distribution system. This dissertation based on the present situation of the lack of the reliability test for the end residual current operated protection,first discusses the principles of the end residual current operated protection and the significance of the on-the-spot test, then puts forward three testing methods for the on-the-spot test,further indicates the features and the sphere of application of the on-the-spot test,at last,identifies the practicability of the on-the-spot testing method with a engineering example.

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有源电力滤波器(APF)是电能质量治理中用于抑制电网谐波电流的主要装置。APF系统中,谐波电流检测的快速性、准确性决定了系统补偿谐波电流的性能。采用基于瞬时无功功率理论的谐波电流检测方法来解决谐波电流的检测问题。通过在EMTDC/PSCAD搭建模型进行仿真计算,验证了理论的正确性。通过制作样机进行测试实验,验证了基于瞬时无功功率理论的APF具有响应速度快、检测准确的优点。
Active power filter (APF) is the main electronics device used to restraining harmonics and compensating reactive power. In the system of APF, the ability is up to the real timing and accuracy of detecting harmonics. In this thesis, it offers a harmonic current detection method is based on instantaneous reactive power referencing traditional arithmetic. In this thesis, EMTDC/PSCAD used to simulate detection method and a model machine used to empirical test. Experiments have shown that, the harmonic current detection method based on instantaneous reactive power have better response rates and accuracy. APF model machine can meet the harmonic compensation requirement.

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