Variable speed drive system for cooling fan powered from current transformer under self-balancing power control
With the increase in the transmission capacity of China's power system,the thermal power of key equipment components such as the converter transformer valve bushing of the transmission line also increases.Therefore,it is necessary to design and develop equipment such as heat dissipation fans to a-chieve active heat dissipation for multiple overheating failure points.A variable speed drive system for cooling fan powered from current transformer(CT)was designed and developed,which uses energy ob-tained from the transmission line by CT to supply power to the heat dissipation fan,to solve the problem of conventional power supply being unable to be used for transmission lines.In response to the problem that the CT power supply capacity changes continuously and uncontrollably with the transmission line cur-rent,a new strategy of power active self-balancing was designed to adapt to the wide range of CT seconda-ry current changes by using the control freedom of the load,and to extend the stable operation range and improve power supply capacity.The device was tested and verified by mounting it on the AC transmission bus.The effective value of the bus current changes within the range of thousands of amperes,and the de-vice is stable and maintains a power capacity utilization rate of more than 60%.
converter transformer valve bushingcurrent transformerenergy harvesting power supplyadjustable speed air coolingpower balancestable operation range
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