Analysis and Treatment of Parasitic Circuit in Cooling System of a 500 kV Transformer
In allusion to a fault of mistaken startup of the standby cooler during the process of switching the operation mode of the coolers of a 500 kV forced oil-circulated air-cooled transformer,based on the analysis of the principle of the startup control cir-cuit of the standby cooler,combining with the on-site inspection of the cooling system,the cause of the fault is determined,i.e.dur-ing the process of switching the operation mode of the coolers,the parasitic circuit in the control circuit due to the improper coordi-nation of time relays causes the startup control relay of the standby cooler to act.Finally,the improvement measure of setting trans-fer switch in the startup circuit of standby cooler is proposed,wihic provides reference for the treatment of similar cooling system faults.
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