套管介損在線監(jiān)測(cè)測(cè)量誤差及其影響因素試驗(yàn)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(diǎn)實(shí)驗(yàn)室(廣東電網(wǎng)有限責(zé)任公司電力科學(xué)研究院),廣東 廣州 510080;2 廣東電網(wǎng)有限責(zé)任公司,廣東 廣州 510060)
摘 要:結(jié)合工程實(shí)際,分析了介質(zhì)損耗角正切值tanδ在線監(jiān)測(cè)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(hào)通道以及信號(hào)調(diào)理單元的復(fù)雜等值電路模型,通過試驗(yàn)得到了電路模型中主要的等效電氣參數(shù)。搭建了高、低壓試驗(yàn)平臺(tái)以模擬套管介損測(cè)量,模擬在復(fù)雜電磁及大氣環(huán)境下傳感器接線方式、空間電磁場(chǎng)對(duì)測(cè)量回路以及tanδ測(cè)量結(jié)果的影響,結(jié)合電路仿真分析了溫、濕度對(duì)電流傳感器測(cè)量角差的影響規(guī)律,通過老化試驗(yàn),研究了元器件老化對(duì)信號(hào)調(diào)理單元等值電氣參數(shù)和輸出相差的影響。理論分析和實(shí)驗(yàn)結(jié)果驗(yàn)證了多因素對(duì)測(cè)量二次系統(tǒng)的影響是導(dǎo)致測(cè)量結(jié)果波動(dòng)的主要原因。
關(guān)鍵詞:套管;介質(zhì)損耗角正切值;在線監(jiān)測(cè);電路模型;誤差分析
中圖分類號(hào):TM216+.5;TM835.4 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):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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