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河北某鋼廠使用的煉鋼轉爐爐口冷卻熱水循環泵，流量410m3/h，揚程47m，軸功率65. 6kW,配套電機功率75kW， 鋼額定電流值為139.7A在設備調試中發現電機電流達到了145A， 超過了電機額定電流。
解決過程：現場觀察到電機的電流確為145A，再看泵的進出口壓力計算得到泵的揚程僅為38m，分析認為泵的揚程選的太高，泵在超大流量下經轉，造成泵功率增大，此泵的配用電機功率的儲備系教又較小，造成了泵大流量下電機超電流。所以決定關小泵出口閥門到電流額定值。并建議泵檢修時，可將泵葉輪外經適當切割，減少葉輪外經這樣更節能。渣漿泵廠家

The hot water circulating pump used in a steelmaking converter in Hebei Province has a flow of 410m3 / h, a lift of 47m, a shaft power of 65.6kw, a matched motor power of 75kW, and a steel rated current of 139.7a. It is found that the motor current has reached 145a, exceeding the rated current of the motor.

Solution process: it is observed that the current of the motor is indeed 145a on site, and the pump head is only 38m according to the calculation of the pump inlet and outlet pressure. The analysis shows that the pump head is too high, the pump rotates under the super flow, resulting in the increase of the pump power, and the motor power reserve system of the pump is small, resulting in the motor super current under the large flow of the pump. Therefore, it is decided to close the outlet valve of the small pump to the current rating. It is suggested that when the pump is overhauled, the outside of the impeller of the pump can be cut properly to reduce the outside of the impeller so as to save energy. Slurry pump manufacturer