S
We have four GE 6B units connected with redundant transmission grid system. Say for example grid A and grid B, both are dual circuit 132 KV system. On 17th June, 2018 outgoing feeder breaker (in our power plant) for grid A tripped for exceeding overcurrent limit. All GT's went to FSNL from Base Load and generated the following alarms:
1. Reverse Power Fault
2. Generator Breaker Tripped
3. Remote Breaker Open Detected.
Grid B was stable, there was no significant change in frequency, voltage etc. and Plant 132KV bus remained uninterrupted. GT breakers tripped due to reverse power! My question is why GTs felt reverse power if Grid B and 132 Busbar is stable??
In the Rung there is a relation between L20CBX and L83RBO (Remote Breaker Open Detected) which opens compressor bleed valve if L83RBO becomes "TRUE". Is this (opening of bleed valve for L83RBO=TRUE) a cause of GT load lowering upto reverse power and consequently trips 52G??
1. Reverse Power Fault
2. Generator Breaker Tripped
3. Remote Breaker Open Detected.
Grid B was stable, there was no significant change in frequency, voltage etc. and Plant 132KV bus remained uninterrupted. GT breakers tripped due to reverse power! My question is why GTs felt reverse power if Grid B and 132 Busbar is stable??
In the Rung there is a relation between L20CBX and L83RBO (Remote Breaker Open Detected) which opens compressor bleed valve if L83RBO becomes "TRUE". Is this (opening of bleed valve for L83RBO=TRUE) a cause of GT load lowering upto reverse power and consequently trips 52G??