主變低壓側(cè)接地保護(hù)功能完善及現(xiàn)場(chǎng)應(yīng)用分析

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［摘要］針對(duì)發(fā)電機(jī)變壓器單元接線方式且發(fā)電機(jī)與變壓器之間的帶出口斷路器，探討主變低壓側(cè)出現(xiàn)永久故障點(diǎn)、主變低壓側(cè)接地保護(hù)無(wú)跳閘功能時(shí)發(fā)生無(wú)法快速切除故障的問(wèn)題，提出解決思路并進(jìn)行現(xiàn)場(chǎng)實(shí)際應(yīng)用分析。

［關(guān)鍵詞］主變低壓側(cè)接地保護(hù)；GCB輔助接點(diǎn)；PT斷線；輔助判據(jù)

［中圖分類號(hào)］TM862[文獻(xiàn)標(biāo)志碼]A［文章編號(hào)］1001-523X（2022）08-0058-03

Improvement of Grounding Protection Function at Low Voltage Side of Main Transformer and Field Application Analysis

Chen Qiang，Cao Gang

［Abstract］Aiming at the wiring mode of generator transformer unit and the outlet circuit breaker between generator and transformer，this paper discusses the problem that the permanent fault point occurs on the low-voltage side of main transformer and the fault cannot be removed quickly when the grounding protection on the low-voltage side of main transformer has no tripping function，and puts forward the solution and field practical application analysis.

［Keywords］low voltage side grounding protection of main transformer；GCB auxiliary contact；PT disconnection；Auxiliary criterion

電力系統(tǒng)中，中性點(diǎn)接地方式可分為中性點(diǎn)經(jīng)消弧線圈接地、中性點(diǎn)不接地和中性點(diǎn)直接接地3種。（剩余4027字）