# 避雷器在线监测装置现场校验系统的研发Design and Development of AN Automatic Calibration System for Voltage Dividers

Abstract: In order to solve the problem of field verification of online monitoring device in metal oxide ar-resters, based on the additional injection method, the verification principle of resistive current, capacitive current and total current is proposed, and the verification system is developed. The results of laboratory tests and field measurements show that the output current error of the verification system is within 0.5%, and the phase error is within 0.1, which meets the requirements of field verification accuracy. The verification system also solves the problem that the output current of field demand and the voltage of PT secondary side have difficulty in the same frequency and phase, which provides the reference for field verification of online monitoring device in capacitive equipment.

1. 概述

MOA在线监测装置性能好坏关系到对MOA性能的评价是否正确，无论是误报还是漏报均时有发生，影响电力系统的安全运行 [10] [11] [12] [13] 。在日常检修工作中，从涉及到拆卸、安全、运输成本及耗时考虑 [14] [15] [16] ，微安表通常在离线的条件下校验，近些年兴起的MOA在线监测装置投运后则暂无有效的现场校验手段。在这样的背景情况下，研究MOA在线监测装置现场带电校验技术方法和开发相关的仪器设备就显得十分有意义了。

2. 增量注入法及其校验原理

$I=\left({I}_{R},{I}_{C}\right)=\left({I}_{0}\mathrm{cos}\theta ,{I}_{0}\mathrm{sin}\theta \right)$ (1)

${I}^{\prime }=\left({{I}^{\prime }}_{R},{{I}^{\prime }}_{C}\right)=\left({{I}^{\prime }}_{0}\mathrm{cos}\left({\beta }_{0}+\beta \right),{{I}^{\prime }}_{0}\mathrm{sin}\left({\beta }_{0}+\beta \right)\right)$ (2)

2.1. 阻性电流校验原理

${I}^{\prime }=\left({{I}^{\prime }}_{0}\mathrm{cos}\left(\beta \right),{{I}^{\prime }}_{0}\mathrm{sin}\left(\beta \right)\right)$ (3)

$I+{I}^{\prime }=\left({I}_{0}\mathrm{cos}\theta +{{I}^{\prime }}_{0}\mathrm{cos}\left(\beta \right),{I}_{0}\mathrm{sin}\theta +{{I}^{\prime }}_{0}\mathrm{sin}\left(\beta \right)\right)$ (4)

$\left\{\begin{array}{l}\mathrm{cos}{0.1}^{\circ }\approx 0.9999985\\ \mathrm{sin}{0.1}^{\circ }\approx 0.00174\end{array}$ (5)

$\left\{\begin{array}{l}\mathrm{cos}{0.1}^{\circ }\approx 1\\ \mathrm{sin}{0.1}^{\circ }\approx 0\end{array}$ (6)

$I+{I}^{\prime }=\left({I}_{0}\mathrm{cos}\theta +{{I}^{\prime }}_{0},{I}_{0}\mathrm{sin}\theta \right)$ (7)

2.2. 容性电流校验原理

${I}^{\prime }=\left({{I}^{\prime }}_{0}\mathrm{cos}\left(90+\beta \right),{{I}^{\prime }}_{0}\mathrm{sin}\left(90+\beta \right)\right)$ (8)

${I}^{\prime }=\left(-{{I}^{\prime }}_{0}\mathrm{sin}\left(\beta \right),{{I}^{\prime }}_{0}\mathrm{cos}\left(\beta \right)\right)$ (9)

$I+{I}^{\prime }=\left({I}_{0}\mathrm{cos}\theta -{{I}^{\prime }}_{0}\mathrm{sin}\left(\beta \right),{I}_{0}\mathrm{sin}\theta +{{I}^{\prime }}_{0}\mathrm{cos}\left(\beta \right)\right)$ (10)

$I+{I}^{\prime }=\left({I}_{0}\mathrm{cos}\theta ,{I}_{0}\mathrm{sin}\theta +{{I}^{\prime }}_{0}\right)$ (11)

2.3. 全电流校验原理

Figure 1. A vector plot of the injected current and the linkage current

${I}_{1}=\sqrt{{I}_{0}^{2}+{{I}^{\prime }}_{0}^{2}+2{I}_{0}{{I}^{\prime }}_{0}\mathrm{cos}\left(\theta -\alpha \right)}$ (12)

$\beta =\theta -\alpha$ (13)

${I}_{1}=\sqrt{{I}_{0}^{2}+{{I}^{\prime }}_{0}^{2}+2{I}_{0}{{I}^{\prime }}_{0}\mathrm{cos}\beta }$ (14)

$\beta \le {0.1}^{\circ },\mathrm{cos}\beta \approx 1$ (15)

${I}_{1}={I}_{0}+{{I}^{\prime }}_{0}$ (16)

3. 校验系统的总体设计

3.1. 系统构成

3.2. 频率跟踪部件的设计

1) 锁相跟踪

Figure 2. Schematic diagram of the system

Figure 3. Diagram of phase lock tracking

2) 电流源

Figure 4. Diagram of the current output

4. 实验室功能测试和现场应用

4.1. 实验室校验

Figure 5. Diagram of accuracy tests of resistive current and capacitive current

Table 1. Test data of the resistive current

Table 2. Test data of the capacitive current

Figure 6. Diagram of accuracy tests of full current

Table 3. Test data of the full current

4.2. 现场校验

Figure 7. The wiring connection and test loop of the field verification of the MOA online monitoring devices

(a) (b)

Figure 8. Field verification; (a) the platform of verification; (b) MOA linkage current transducer

Table 4. Increment analysis and data verification of the resistive current

Table 5. Increment analysis and data verification of the full current

5. 结论

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