套管介損在線監(jiān)測測量誤差及其影響因素試驗研究
周丹1,馬志欽1,楊賢1,溫愛輝2,靳宇暉1,姜爍1
(1 廣東省電力裝備可靠性企業(yè)重點實驗室(廣東電網有限責任公司電力科學研究院),廣東 廣州 510080;2 廣東電網有限責任公司,廣東 廣州 510060)
摘 要:結合工程實際,分析了介質損耗角正切值tanδ在線監(jiān)測的誤差影響因素。建立了考慮多元件參量包括套管、電流傳感器、信號通道以及信號調理單元的復雜等值電路模型,通過試驗得到了電路模型中主要的等效電氣參數。搭建了高、低壓試驗平臺以模擬套管介損測量,模擬在復雜電磁及大氣環(huán)境下傳感器接線方式、空間電磁場對測量回路以及tanδ測量結果的影響,結合電路仿真分析了溫、濕度對電流傳感器測量角差的影響規(guī)律,通過老化試驗,研究了元器件老化對信號調理單元等值電氣參數和輸出相差的影響。理論分析和實驗結果驗證了多因素對測量二次系統(tǒng)的影響是導致測量結果波動的主要原因。
關鍵詞:套管;介質損耗角正切值;在線監(jiān)測;電路模型;誤差分析
中圖分類號:TM216+.5;TM835.4 文獻標識碼:A 文章編號:1007-3175(2020)08-0022-06
Experimental Research on Measurement Errors and Its Influencing Factors for On-Line
Tan Delta Monitoring of High-Voltage Bushings
ZHOU Dan1, MA Zhi-qin1, YANG Xian1, WEN Ai-hui2, JIN Yu-hui1, JIANG Shuo1
(1 Guangdong Key Laboratory of Electric Power Equipment Reliability (Electric Power Research Institute of Guangdong Power Grid Co., Ltd), Guangzhou 510080, China; 2 Guangdong Power Grid Co., Ltd, Guangzhou 510060, China)
Abstract: In this paper, combined with engineering practice, the factors affecting the error of online monitoring of the dielectric loss tangent value tanδ are analyzed. A complex equivalent circuit model considering multi-component parameters including bushings, current sensors, signal channels and signal conditioning units is established, and the main equivalent electrical parameters in the circuit model are obtained through experiments.A high and low voltage test platform was built to simulate the casing dielectric loss measurement, simulate the sensor wiring method under complex electromagnetic and atmospheric environments, the influence of the space electromagnetic field on the measurement loop and the tanδ measurement results, and combined with circuit simulation, the influence of temperature and humidity on the angle difference measured by the current sensor is analyzed. Through the aging test, the influence of component aging on the equivalent electrical parameters and output phase difference of the signal conditioning unit is studied. Theoretical analysis and experimental results verify that the influence of multiple factors on the measurement secondary system is the main reason for the fluctuation of the measurement results.
Key words: bushings; dielectric loss tangent tan δ; on-line monitoring; circuit model; error analysis
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