Analysis and Handling of SVG Fiber Optic Circuit Breakage Fault in a 750 kV Substation
Based on the background of the No.2 static var generator(SVG)in a 750 kV substation,this paper proposes measures to avoid fiber optic open circuit faults that occur during its grid connection and operation.Firstly,the fault process is interpreted.While analyzing the topology of the energy harvesting power supply,a disassembly test is conducted on the module energy harvesting power supply.It is found that the cause of the fault is that the pin of the input capacitor in the single module energy harvesting power supply is damaged and in a virtual connection state,causing the 50V to 400V circuit board to be in a low—voltage input working state.Finally,the turn to turn short circuit burns out,causing the fiber optic to break and leading to the failure of grid connection of No.2 SVG.Combined with the types of devices that have experienced frequent failures since the device was put into operation,it is confirmed that these types of failures have common causes,all of which are caused by fine components in the energy harvesting power supply breaking or poor contact due to long—distance transportation bumps,vibrations,and other reasons,leading to tripping and other faults.Finally,measures such as reinforcing fine components with glue and adopting packaging boxes with high seismic performance are proposed to prevent such failures from occurring.
substationSVGenergy harvesting power supplyfault analysis
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