配電網(wǎng)中性點(diǎn)經(jīng)小電阻接地系統(tǒng)改造方案研究
陳麗霞1 ,上官誠(chéng)江2 ,黃純熙1 ,陳潤(rùn)欣1 ,張國(guó)平1
(1 國(guó)網(wǎng)福建省電力有限公司福州供電公司,福建 福州 350007;
2 福建星云電子股份有限公司,福建 福州 350007)
摘 要 :小電阻接地方式可有效降低過電壓和提高故障選線率,但在小電阻改造過渡期間存在并列轉(zhuǎn)供電等問題。通過對(duì)一次接線方式進(jìn)行分析,在小電阻接地變高壓側(cè)與主變低壓側(cè)間加裝專用開關(guān)。對(duì)改造后的運(yùn)行方式進(jìn)行繼電保護(hù)分析并提出相應(yīng)的二次應(yīng)對(duì)措施及過渡方案,實(shí)際應(yīng)用案例表明,新方案有效提高了配電網(wǎng)小電阻接地改造期間的供電可靠性。
關(guān)鍵詞 :配電網(wǎng) ;小電阻接地 ;并列運(yùn)行 ;備自投
中圖分類號(hào) :TM862 文獻(xiàn)標(biāo)識(shí)碼 :B 文章編號(hào) :1007-3175(2021)06-0038-05
Study on the Reconstruction Scheme of Distribution Grid Neutral-Point
Grounding System Through Small Resistance
CHEN Li-xia1 , SHANGGUAN Cheng-jiang2 , HUANG Chun-xi1 , CHEN Run-xin1 , ZHANG Guo-ping1
(1 Fuzhou Power Supply Company, State Grid Fujian Electric Power Co., Ltd, Fuzhou 350007, China;
2 Fujian Nebula Electronics Co., Ltd, Fuzhou 350007, China)
Abstract: Small resistance grounding method can effectively reduce overvoltage and improve fault line selection rate, but there are some problems during the transition of small resistance transformation, such as parallel to power supply. Through the analysis of the primary wiring mode, a special switch is installed between the high voltage side of the small resistance grounding transformer and the low voltage side of the main transformer. Relay protection analysis is carried out on the operation mode after transformation and corresponding secondary countermeasures and transition schemes are put forward, and the practical application shows that the new scheme can effectively improve the reliability of power supply during the transformation of small resistance grounding in distribution network.
Key words: distribution grid; small resistance grounding; parallel operation; automatic bus transfer
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