變電站接地網(wǎng)布置方式及設(shè)計規(guī)范差異對比分析研究
吳小剛1，于濤2
（1 貴州電力設(shè)計研究院，貴州 貴陽 550002；2 中機(jī)中聯(lián)工程有限公司，重慶 400039）
摘 要：根據(jù)DL/T 621—1997《交流電氣裝置的接地》和GB/T 50065—2011《交流電氣裝置的接地設(shè)計規(guī)范》中對變電站接地網(wǎng)的相關(guān)設(shè)計要求，以某500kV變電站土壤電阻率測試結(jié)果為基礎(chǔ)，對兩個規(guī)范中用到的工頻接地電阻、轉(zhuǎn)移電位、接觸電位差、跨步電位差等重要參數(shù)指標(biāo)進(jìn)行對比計算分析，得出兩本規(guī)范之間的異同，并分析了差異產(chǎn)生的原因，供相關(guān)設(shè)計人員參考。
關(guān)鍵詞：變電站接地網(wǎng)；接地電阻；接觸電壓；跨步電壓；熱穩(wěn)定校驗(yàn)
中圖分類號：TM63 文獻(xiàn)標(biāo)識碼：A 文章編號：1007-3175(2016)04-0021-05
Comparative Analysis Between Substation Grounding Grid
Layout and Differences from Design Specifications
WU Xiao-gang1, YU Tao2
（1 Guizhou Electric Power Design & Research Institute, Guiyang 550002, China;
2 CMCU Engineering Co., Ltd, Chongqing 400039, China）
Abstract: According the requirements of grounding grid design in substation which quote from Grounding for AC electrical installations (DL/T 621—1997) and code for design of AC electrical installations earthing (GB/T 50065—2011), based on the earth resistivity test results in 500kV substation, this paper carried out analysis of contrast calculation for important parameter indexes including industrial frequency earthing resistance, shifting potential, contact potential difference and step potential difference between the two specifications. The similarities and differences between the two specifications were obtained and the caused reasons were analyzed to provide references for the relevant designers.
Key words: substation grounding grid; grounding resistance; touch voltage; step voltage; thermal stability test
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