M
Hi
We are running two 500kva gensets with an paralleling panel which is only used to transfer the load between the generators when one of them is due for maintenance or a repair (They run 24/7). The power is supplied to a 500kva rated VFD which drives an submersible oil well pump. The system has been running with no problems since it was installed 2 years ago, two months ago the pump had to be pulled out from the well because of an mechanical fault, a new one was lowered in as a replacement, now that a new pump is installed the well needs to go back into production so... we start up one of the generators, closes the breaker and the VFD operator starts up the pump, as soon as the pump starts to pull power the generator and the control panel goes crazy, synch controllers starts puling down the RPM on the generator tills the generators trips on "Under Frequency", using my multimeter to measure the frequency, instead of getting 50HZ i get 150HZ so think to my self this most be harmonics, so an harmonic test was done and the 5th harmonic has gone up to 64% which i can't explain why, we are still using the same Generators, Control Panel, VFD, Step up Transformer, with the same power consumption as before, the only difference is a new exact copy of the old pump installed replacing the old broken one.
So what do you guys think could cause this? to me this is strange, even the guy in charge of the VFD say's that he haven't changed any setting on the VFD.
We are running two 500kva gensets with an paralleling panel which is only used to transfer the load between the generators when one of them is due for maintenance or a repair (They run 24/7). The power is supplied to a 500kva rated VFD which drives an submersible oil well pump. The system has been running with no problems since it was installed 2 years ago, two months ago the pump had to be pulled out from the well because of an mechanical fault, a new one was lowered in as a replacement, now that a new pump is installed the well needs to go back into production so... we start up one of the generators, closes the breaker and the VFD operator starts up the pump, as soon as the pump starts to pull power the generator and the control panel goes crazy, synch controllers starts puling down the RPM on the generator tills the generators trips on "Under Frequency", using my multimeter to measure the frequency, instead of getting 50HZ i get 150HZ so think to my self this most be harmonics, so an harmonic test was done and the 5th harmonic has gone up to 64% which i can't explain why, we are still using the same Generators, Control Panel, VFD, Step up Transformer, with the same power consumption as before, the only difference is a new exact copy of the old pump installed replacing the old broken one.
So what do you guys think could cause this? to me this is strange, even the guy in charge of the VFD say's that he haven't changed any setting on the VFD.