100 kw to amp2/9/2024 ![]() This particular motor has a slip of only 10 rpm at full load, this means that if we close the contactor at 1510 RPM, we are actually exporting 100 kW to the grid (180 A), plus magnetization current about 5 times that. The reason it needs to be brought to synchronous speed is to keep low the starting current, so the above protection won't trip. we are 100% sure it is an asynchronous machine. If we close the main contactor, wether the motor is stopped or spinning at synchronous speed, the 250 A protection on the utility side trips. When we trip it, we have to call the utility maintenance guys so they reset it. the protection that trips is upstream of the meter (it's not user-accessible, cannot be bypassed). what is DOL (I'm sorry for my ignorance, I'm a mechanic playing the electrician Thanks! RE: starting 100 kW AC motor using inductance Skogsgurra (Electrical) 19 Mar 16 08:48 The starting power of the IC engine at near-zero rpm is less than 3 kW, plus it'll take about 10 kW to move it at 1500 rpm while it starts (about 10 seconds).Īny ideas to avoid buying a new engine or a delta-star starter? ![]() What would happen if we close the main contactor while keeping closed the inductor branch? Will this make the motor run or trip the 250A protection? During the test, current in each phase was 210 A and the phase-to-phase voltage in the motor side of the inductance was 50 V. I had the idea to close the contact in the inductance branch with the engine and motor stopped: the inductance hummed and the motor moved about 1 degree. Is there a way to use them to "soft start" the generator in motor mode? but we only have the inductances in place. If we had a delta-star or a soft starter we could use it to move the generator and start the engine. Since this is an Asychronous machine, it is essentially a standard AC motor. First the inductance branch is closed (so we get the current peak "filtered" by the inductance) then the main contactor is closed. To avoid tripping the 250A protection on this line, there is a 3 phase inductance and a smaller contactor in parallel with the main one. The usual procedure to get this generating plant online is to start the engine, ramp the generator to sync speed and then connect it to mains. Problem is there's no starter for this large "motor" on site. Our "brilliant" solution: use the generator as a motor (is it a brilliant solution?). Because the generator is SO massive it tolls the engine starter way more than it's designed for and we keep burning it (not to mention constantly ruining the battery). The whole picture: the motor is in reality a 110 kW asynchronous 3-phase generator (400 V, delta connected, 50 Hz), moved by an internal combustion engine. Is there a way to use a 3-phase inductance to start an AC motor?
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