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With a delay of 300 msec and operating at 53 HZ, our open transfer and starting current go just fine. I think the reduced back pressure assisted us as 300 Amps motor is drawing around 150 Amps due to the reduced available back pressure. Current during transfer remains around 200 Amps on...

Thanks a lot for taking out time to clarify my problem. From your response, it seems that only slow open transfer option is available for me with my setup. From previous threads, I learned that Jref(sorry for mentioning the name) has mentioned that it has been done quite often in irrigation...

We have implemented ATV 630 with by pass contactor scheme for starting 03 numbers Multistage Plunger pump system. ATC 630 donot have line synchronization provisions, so we have opted for open transition. Motor is 400 V 50Hz 200 KW 1480 rpm and pump is 208 rpm with gear system in between. Pump...