由35 kV箱變高壓熔斷器引起高壓開關柜跳閘的事故分析

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［摘要］某光伏發(fā)電站35 kV箱變作為光伏逆變器的并網(wǎng)電源，在發(fā)電站中的主要作用是對光伏逆變器發(fā)出的交流電進行升壓。在運行中出現(xiàn)一起高壓熔斷器單相熔斷故障，造成箱變高壓熔斷器套管燒毀、集電線路跳閘的事故，導致35 kV集電線路所連接的逆變器全部停運，造成了巨大的電量損失和經(jīng)濟損失。

［關鍵詞］高壓熔斷器；箱變；跳閘

［中圖分類號］TM411+.2［文獻標志碼］A［文章編號］1001-523X（2022）08-0138-03

Together with the Analysis of the Tripping of the High Voltage Switchgear Caused by the 35 kV Box Variable Voltage Fuse

Cheng Le，Xu Shuo，Zhou Yi-long

［Abstract］A photovoltaic power station 35 kV box boost transformer（hereinafter referred to as box transformer），as the grid-connected power supply of photovoltaic inverter，the main role in the power station is to boost the electricity emitted by the photovoltaic inverter. In operation，a single-phase fuse fault of the high-voltage fuse occurred，resulting in the burning of the casing of the box-changing high-voltage fuse and the tripping of the collector line，resulting in the suspension of all the inverters connected to the 35 kV collector line，resulting in huge power losses and economic losses.

[Keywords]high voltage fuse；box change；tripping

某光伏發(fā)電站批復裝機容量為50 MW，每10臺箱式升壓變壓器（以下簡稱箱變）為一回35 kV集電線路，共建設5回集電線路，每回集電線路容量為10 MW；35 kV箱變配置容量為1000 kVA，高壓側(cè)額定電壓等級為37 kV，低壓側(cè)電壓等級為315 V的雙分裂升壓箱式變壓器，35 kV系統(tǒng)接組標號為星形（Y型），在線路非全相運行（三相電流不平衡）產(chǎn)生差流后高壓開關柜零序過流保護會動作跳閘。（剩余4228字）