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Recent content by CSCEE
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Starting a 4500 hp motor while it was coasting down
You lost some motor life when you reclosed in on a coasting motor. Severe mechanical shock can occur to the motor and shaft when the restart happens. Use an undervoltage relay with a timer to block timing until at least 10 seconds after the trip. It is best to wait until the motor is fully...- CSCEE
- Post #11
- Forum: Electric motors & generators engineering
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480 VAC Transformer Question
The delta primary of the 45 KVA transfomer will connect directly to the 480V supply. The secondary 120/208V wye will require grounding to a ground rod, structural steel, and/or metal water pipe per the NEC, and be bonded to the utility grounding conductor. The 480V supply must be a 4-wire...- CSCEE
- Post #8
- Forum: Electric motors & generators engineering
