All about Ship High Voltage Diesel Generator working procedure
Like all work with high voltage, two persons are always required, with at least one electrician with a high voltage training course.
Secure the ship diesel engine from starting:
Close the starting air valve, drain the air and remove interlock key if existing.
Close the fuel valve and remove interlock key if existing.
Turn off AVR supply both in MSB1 and MSB2.
Ship High Voltage working procedure
The fuses should be secured with lock out equipment or at least be tagged out with a tag “Do not operate” or similar.
Remember both Feeder breakers “A”(MSB1) and “B”(MSB2) needs to be taken out.
Pull the breakers out using the provided handle to crank the breaker out to test position.
Engage the earthing coil with activating “ES” on the REM. (remember both breakers needs to be out test position to be able to do this)
You will now hear a small click in the earthing switch interlock coil.
The earthing switch is now ready to be activated.
Take out the ground interlock key.
The electrician in charge should keep these keys personally until work is finished.
Open the high voltage panel Transformer (on the high voltage side).
Remember that high voltage equipment should be considered live until you have established visible earthing of the work place.
Do a voltage test with proper high voltage tester.
Remember to do a function test of the tester both before and after the actual test.
The work place is now ready to be earthed.
Connect all three phases to ground with proper high voltage earthing equipment designed for the short circuit currents.
The work place is now safe and ready for the needed maintenance.
A tool check list should be made, listing all tools that are being used. This needs to be checked out when finished the work, making sure that no tools are left behind at the work place.
After finishing the work, disconnect the earthing apparatus and again remember that the connections should now be considered “alive” since they are no longer grounded.
Return the keys and disconnect the earth switch.
It’s a good habit to stay away from the switchboard room first time connecting the breakers again in an unlikely case of forgotten tools etc, making a short circuit.