This document briefly describes the Generator Synchronization functions used on the Mark V Turbine Control System.
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and Failed to Close alarms alarms Out of Sync and •
DESCRIPTION
This document describes the difference between and trouble shooting of Out of Sync and and Failed to Close alarms as provided in the DSE7500 and DSE5500 series controllers. •
OUT OF SYNC
An Out of Sync alarm means that the DSE module has detected that the supplies either side of the breaker are not in sync when the breaker is closed. The DSE module uses a fixed 15 ° window to asses this. o
Troubleshooting
The Bus Sensing connections connections have not been made between the common generator bus and the DSE module, or the bus sensing fuses have blown or have been removed. device does not close quickly enough. Ensure the breaker breaker closes The load switching device within 100mS of receiving the close signal. timer is set too low. If you raise this timer away from the factory setting The Out of Sync timer of 200mS (0.2s), ensure you understand why you are having to raise it! external has caused caused the breaker to open, or has prevented it from closing. Something external Typical examples are external G59 relays and other equipment operating directly on the t he breaker to open it. correct, causing the breaker to ‘fire through’, The breaker wiring ‘logic’ may not be correct, where it triggers the close mechanism, but the breaker doesn’t actually mechanically close, it re-opens again.
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GEN FAILED TO CLOSE
This means that the DSE module has not detected the feedback f eedback signal from the auxiliary auxiliary on the generator breaker. o
Troubleshooting.
The Bus Sensing connections have have not been made made between the common common generator bus and the DSE module, or the bus sensing fuses have blown or have been removed. not close. (This would would usually give an Out of Sync alarm unless unless the The breaker did not Gen Failed to Close timer was set the same or less than the Out of Sync timer.) with the auxiliary or the connection from the auxiliary to the DSE module. module. There is a fault with is set too low. A typical time is between 0.5 and 1.0s. The Gen Failed to Close timer is
056-047 Out of Sync and Failed to Close Issue 1.1 – A.D.Manton A.D.Manton
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EXTERNAL TRIP RELAYS
Where an external device is giving protection to the system and is opening the generator breaker directly, the DSE module MUST be given an input signal to inform it of this operation. Use an input configured to Electrical Trip if the external device is opening the generator breaker or Auxiliary Mains Failure if the external device is opening the mains breaker. Example of external G59 relay tripping the mains breaker directly.
DSE7510 / DSE5510 Auxiliary Mains Failure
G59 Relay
Mains breaker opening control Configuration to achieve this (using : Drive this input with the external G59 relay
Use the out of sync timer to ensure the DSE module doesn’t detect the Out of Sync situation before it receives the Auxiliary Mains Fail input. Use Immediate Mains Dropout so that the DSE module also gives the signal to open the mains breaker and move into the “mains off load” state.
056-047 Out of Sync and Failed to Close Issue 1.1 – A.D.Manton
