Hi! We have a 3.5 MW, 4.16 kV, 4 poles synchronous generator with brushless rotor refurbished recently by substitution of the four poles for original replacement parts. We put the unit in parallel service with another identical one delivering 1.6 MW at 0.8 pf each one. The vibration analysis...
Thanks Ralph for your valuable questions and sorry for taking so long to respond. Everything you mentioned earlier was verified: protection coordination, appropriate CT’s burden and right instruments connections. The current tap position in the CDG36 is 2 and the line CT ratio is 600/5 for the...
In fact, all the generators are low resistance grounded. Time-lag element of CDG36 is tripping and instant stage is not implemented.
The generator is running since last monday without any other fault trip and e/f element of CDG36 out of order. It was first suspected of the line CT polarity...
Hi everyone. I have a 7.5 MW power plant with 3 old generators units of 2.5 MW working in parallel directly attached to a 4160 V bus bar. One of the units is having Earth Fault trips as it is read in a CDG36 relay. The CDG36 coil current is the sum of the secondary three phase currents of the...
