Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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新能源電站接地方式選擇及接地變與配套設(shè)備選型解析

來(lái)源:電工電氣發(fā)布時(shí)間:2022-11-25 13:25 瀏覽次數(shù):311

新能源電站接地方式選擇及接地變與配套設(shè)備選型解析

周強(qiáng)
(國(guó)家電投集團(tuán)電站運(yùn)營(yíng)技術(shù)(北京)有限公司,北京 102209)
 
    摘 要:新能源電站電纜-架空混合線路電容電流較大,為限制故障電流及系統(tǒng)過(guò)電壓,開(kāi)展接地方式分析和設(shè)備計(jì)算選型顯得尤為重要。整理并分析了新能源電站接地方式的各類規(guī)程條款,分析了主變低壓側(cè) 35 kV 系統(tǒng)常用的兩種接地方式,闡述了消弧線圈接地和小電阻接地的選擇方法及優(yōu)缺點(diǎn)。重點(diǎn)對(duì)電容電流計(jì)算、消弧線圈容量選擇、小電阻值選擇、站用負(fù)荷計(jì)算、接地變選型進(jìn)行了解析說(shuō)明,為新能源電站接地系統(tǒng)選擇及優(yōu)化設(shè)計(jì)提供了借鑒經(jīng)驗(yàn)。
    關(guān)鍵詞: 接地變;消弧線圈接地;小電阻接地;電容電流
    中圖分類號(hào):TM614     文獻(xiàn)標(biāo)識(shí)碼:B     文章編號(hào):1007-3175(2022)11-0045-06
 
Analysis on the Selection of Grounding Mode and Grounding Transformer and
Accessory Facilities of New Energy Power Station
 
ZHOU Qiang
(SPIC Power Plant Operation Technology(Beijing)Co., Ltd, Beijing 102209, China)
 
    Abstract: The capacitive current of cable-overhead hybrid line of new energy power station is relatively large, causing fault current and system over-voltage, so it is more important to carry out grounding mode analysis and computing equipment selection. In the paper, regulations and clauses of grounding mode of new energy power station and two common grounding mode of low-voltage side of main transformer in 35 kV system are analyzed, the selection and advantages and disadvantages of grounding by arc-suppression coil and low resistance grounding are elaborated. Greater importance is attached to explaining calculation of capacitive current, selection of arc-suppression coil capacity and low resistance value, load calculation and grounding transformer, which provides references and experience to select and optimize grounding system of new energy power station.
    Key words: grounding transformers ; grounding by arc-suppression coil; low resistance grounding; capacitive current
 
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