electrical philosophy

2 RS31-M00E937

1-PURPOSE................................................................................................................................................................................... 3

2-ELECTRIC POWER PLANT DESCRIPTION........................................................................................................................ 3

2.1-GENERALITIES...................................................................................................................................................................... 32.2-ELECTRIC PRODUCTION DESCRIPTION............................................................................................................................ 32.3-ELECTRIC DISTRIBUTION DESCRIPTION.......................................................................................................................... 4

3-CONTROL TRANSFER............................................................................................................................................................ 5

3.1-GENERALITIES...................................................................................................................................................................... 53.2-PRINCIPLE OF TRANSFER.................................................................................................................................................... 7

3.2.1-Level 1............................................................................................................................................................................... 73.2.2-Level 2............................................................................................................................................................................... 73.2.3-Level 3............................................................................................................................................................................... 83.2.4-Particularities.................................................................................................................................................................... 9

4-LOAD CONTROL................................................................................................................................................................... 12

4.1-GENERALITIES.......................................................................................................................................................................... 124.2-LOAD SHARING AND FREQUENCY CONTROL............................................................................................................................... 124.3-START /STOP OF GTG PRINCIPLE.............................................................................................................................................. 13

4.3.1 Cascade ON/OFF principle.............................................................................................................................................. 134.3.2 Propulsion Generator request principle............................................................................................................................ 13

4.4-LOAD CONTROL STRATEGY TO AVOID OR LIMIT BLACK OUT......................................................................................................134.4.1 Generalities...................................................................................................................................................................... 134.4.2 First scenario.................................................................................................................................................................... 144.4.3 Second scenario :.............................................................................................................................................................. 15

4.5-LOAD SHEDDING................................................................................................................................................................. 164.6-GTG LIMITATION..................................................................................................................................................................... 18

4.6.1 Start-up of boiler.............................................................................................................................................................. 184.6.2 10 MW limitation.............................................................................................................................................................. 18

4.7-STG CONTROL......................................................................................................................................................................... 204.7.1 Connection on the net....................................................................................................................................................... 204.7.2 Disconnection of the net :................................................................................................................................................. 204.7.3 Alarm reset and acknowledgement.................................................................................................................................... 20

5- BLACK OUT SEQUENCE..................................................................................................................................................... 21

5.1 TOTAL BLACK OUT............................................................................................................................................................. 215.1.1 EDG available and ADG selected as ADG........................................................................................................................ 215.1.2 EDG not available and ADG selected as EDG.................................................................................................................. 23

5.2 HALF BLACK OUT............................................................................................................................................................... 245.2.1 EDG available and ADG selected as ADG........................................................................................................................ 245.2.2 EDG not available and ADG is selected as EDG............................................................................................................... 25

6-SHIP’S OPERATIONAL SITUATION CHANGE................................................................................................................. 26

6.1-PRESENTATION OF DIFFERENT MODE............................................................................................................................ 266.1.1 - Port mode :..................................................................................................................................................................... 266.1.2 - Manoeuvring mode :....................................................................................................................................................... 266.1.3 - Open Sea mode :............................................................................................................................................................. 26

6.2-PORT TO MANOEUVRING.................................................................................................................................................. 266.3-MANOEUVRING TO PORT.................................................................................................................................................. 266.4-MANOEUVRING TO OPEN SEA.......................................................................................................................................... 266.5-OPEN SEA TO MANOEUVRING.......................................................................................................................................... 27

3 RS31-M00E937

1-PURPOSE The purpose of this document is to described and explain the Power Management System through Automation

System.

2-ELECTRIC POWER PLANT DESCRIPTION

2.1-GENERALITIES Refer to one line electrical diagram included.There are four main electric networks :

-Main network 11kV - 60Hz : power supplied by 11kV generators (2 GTG , 1 STG , 1 ADG)- Additional 11 kV – 60 Hz network supplied by Additional Diesel Generator or by main 11 kV main network.-Main network 450V - 60Hz : power supplied by 11kV network through transformers 11kV-450V or by emergency 450V generator or by shore 450V supply .-Emergency network 450V - 60Hz : power supplied by 11kV network through transformers 11kV-450V or by emergency 450V generator.

There are six switchboards for the electric distribution :-TPTHT 11kV starboard main switchboard -TPBHT 11kV port main switchboard -TPAHT11kV additional switchboard-TPTF 450V starboard switchboard-TPBF 450V port switchboard-TPFS 450V emergency switchboard

Abbreviations :MAS : Machinery Automation SystemECR : Engine Control RoomSWBD : SwitchboardGTG : Gas turbine GeneratorEDG : Emergency Diesel GeneratorADG : Additional Diesel GeneratorSTG : Steam Turbine GeneratorPMS : Power Management SystemPLS : Propulsion Limitation SystemBO : Black-OutOS : Operator StationTCP : Turbine Control Panel (for GTG)STCP : Steam Turbine Control Panel

2.2-ELECTRIC PRODUCTION DESCRIPTION The electric production includes the following equipment’s :

- 2 Gas Turbine Generators (11kV , 60Hz , 25MW , 3600RPM) connected to 11kV main switchboards : Gas Turbine Generator 1 on starboard switchboard (TPTHT) Gas Turbine Generator 2 on port switchboard (TPBHT)

- 1 Steam Turbine Generator (11kV , 60Hz , 9,45MW , 3600RPM) connected to 11kV port main switchboard (TPBHT) slave of at least one gas turbine generator running .- 1 additional diesel generator (11kV , 60Hz , 3MW , 1800RPM) connected to the additional switchboard (TPAHT) for essential services (not for electric propulsion)- 1 emergency diesel generator (450V , 60Hz , 1,2MW , 1800RPM) connected to the emergency switchboard (TPFS).

4 RS31-M00E937

2.3-ELECTRIC DISTRIBUTION DESCRIPTION TPTHT supplies main following elements :-TPTF 450V starboard switchboard-STBD propulsion motor MPE1-STBD POD auxiliaries-STBD harmonic filter-Thrusters PT01M and PT03M-air conditioning compressors VFGU1 and VFGU2-Aft engine auxiliaries STBD-Substation 2 (connected in loop to substations ,3,4,5,6,7,galleys)

TPBHT supplies main following elements :-TPBF 450V port switchboard-PORT propulsion motor MPE2-PORT POD auxiliaries-PORT harmonic filter-Thruster PT02M-Air conditioning compressors VFGU3 and VFGU4-Aft engine auxiliaries PORT-Substation galleys (connected in loop to substations 7,6,5,4,3,2)-Substation galleys (connected in loop to substations 7,6,5,4,3,2)

5 RS31-M00E937

3-CONTROL TRANSFER

3.1-GENERALITIES The operator interface with the power generation system, the two Gas turbines and the Steam turbine, is based on a 3 level hierarchy . This strategy incorporates varying levels of control from physically separate operator stations or panels which are in different locations.

The principle of control transfer is showed hereafter for the two Gas Turbine set and the STG set. Each generator is independently controlled. It will possible to have one generator control from one level and an another generator control from a

different level.

The control levels for Power Management System are in decreasing priority order :

level 1 (highest priority): -PORT mimic panel located in PORT 11kV switchboard room (control port GTG and STG) -STBD mimic panel located in STBD 11kV switchboard room (control STB GTG only)-level 2 :-WOODWARD operator station fitted on Engine Control Room desk. Control of the two GTG is possible.-PORT WOODWARD operator station fitted on Turbine Control Panel (TCP) located in PORT 11kV switchboard room . Control of the two GTG is possible.-STBD WOODWARD operator station fitted on Turbine Control Panel (TCP) located in STBD 11kV switchboard room. Control of the two GTG is possible. -Steam Turbine Control Panel (STCP) located in PORT 11kV switchboard room. Control of STG is only available.level 3 (lowest priority) :-MAS operator stations fitted on Engine Control Room desk .

NOTE 1 : Level 3 (IAS) can control either GTG set or STG set depending of control transfer achieved.

The changes of control levels complies with the following rules :-only one control level is active at any time .-change from a higher priority level to a lower one is never urgent (control remains in the operator

station until taking control from lower station is effective).-change from a lower priority mode to a higher one is always immediate by action on the adapted switch and doesn’t need a transition level .-change from a higher priority to a lower one is always initiated by an operator at the higher level.-in case of MAS failure communication failure there is an automatic transfer to level 2 (see details hereafter).-in case of Ethernet communication failure at level 2 there is an automatic transfer to level 3 (see details hereafter).-change of level has no incidence on actuators status and load sharing mode-change of control level has no incidence on the monitoring , it is always available at any level .

6 RS31-M00E937

7 RS31-M00E937

3.2-PRINCIPLE OF TRANSFER Following transfers are allowed:

-level 1 to level 2-level 1 to level 3-level 2 to level 1-level 2 to level 3-level 3 to level 2-level 3 to level 1

See Control Mode Hierarchy “ General flow chart”.

3.2.1-Level 1 Each switchboard room mimic panel is equipped with a hardwired LOCAL / REMOTE switch (C33) :

a)-if the switch (C33) is on LOCAL , control is taken from any other level without any transfer sequence except alarm . From the level 1 Stbd mimic panel, GTG1, Stbd breakers and Emergency breakers are controlled. From the level 1 Port mimic panel, GTG2, STG, Port breakers and Emergency breakers are controlled.All level 1 controls are hard wired type between switchboard mimic and TCP. So this level is independent of any

communication fault.

The following main actions are available on the mimic panels : (see diagram 500E8000 FOR DETAILS).-normal start / quick start / normal stop of gas turbines ,-start / stop of emergency diesel , additional diesel , steam turbine ,-increasing / decreasing of generators speed,-opening / closing of circuit breakers .

The following mode selectors are available on the mimic panel :-GTG mode selector : OFF / RUN / LOW CRANK / HIGH CRANK ,-Synchro selector : AUTO / MANUAL ,-Load sharing selector : DROOP / ISOCH

b)-if the switch (C33) is on REMOTE, control is given to level 2 or level 3 (if all level 2 OS are set to PASS).Transfer control will be effective when operator ACCEPT CONTROL at this level 2 or 3.

3.2.2-Level 2 3.2.2.1 GTG local level 2 : Woodward operator station in SWBD room (Port and Stbd)

Control at local level 2 is available only if switchboard room mimic panel switch is on remote and Ethernet network is OK.Control of one or both GTG is possible. On each local level 2 operator station there are two soft push buttons ACCEPT CONTROL , PASS CONTROL .

ACCEPT CONTROL at local level 2 permissive :- Local/Remote switch on the level 1 switchboard mimic panel set to remote- Opposite side local level 2 OS set to pass (for the one considered GTG set).- Remote level 2 OS set to pass (for the one considered GTG set).- Ethernet communication link OK.

When all above conditions are met, the operator can validate transfer by action on ACCEPT CONTROL soft push-button.

PASS CONTROL from level 2 to level 3 or another level 2 operator station :To allow control transfer at an operator station , other operator stations must be set to PASS CONTROL.Control is kept at level 2 until operator ACCEPT CONTROL at level 3.The level 2 has the same means of control than level 1.

8 RS31-M00E937

3.2.2.2 Remote level 2 : Woodward operator station in ECRControl at remote level 2 is available only if switchboard room mimic panel switch is on remote and Ethernet network is OK.Control of one or both GTG is possible. On remote level 2 operator station there are two soft push buttons ACCEPT CONTROL , PASS CONTROL .

ACCEPT CONTROL at remote level 2 permissive :- Local/Remote switch on the level 1 switchboard mimic panel set to remote- Port side local level 2 OS set to pass (for the one considered GTG set).- Stbd local level 2 OS set to pass (for the one considered GTG set).- Ethernet communication link OK.

Then operator can validate transfer by action on ACCEPT CONTROL soft push-button.

PASS CONTROL from level 2 to level 3 or another level 2 operator station :To allow control transfer at an operator station , other operator stations must be set to PASS CONTROL .Control is kept at level 2 until operator ACCEPT CONTROL at level 3.The level 2 has the same means of control than level 1.

3.2.2.2 STG level 2 : control panel in Port SWBD roomControl at remote level 2 is available only if Port switchboard room mimic panel switch is on.Only control of STG is possible. At this level operator can ACCEPT CONTROL or PASS CONTROL .

ACCEPT CONTROL at remote level 2 permissive :- Local/Remote switch on the level 1 Port switchboard mimic panel set to remote

Then operator can validate transfer by action on ACCEPT CONTROL soft push-button.

PASS CONTROL from level 2 to level 3 :To allow control transfer to IAS, operator have to PASS CONTROL .Control is kept at level 2 until operator ACCEPT CONTROL at level 3.The level 2 has the same means of control than level 1.

3.2.3-Level 3 Control at remote level 3 (IAS) is available only if switchboard room mimic panel switch is on remote and MAS ALIVE Status (IAS in order).On IAS operator station there is one soft push button ACCEPT CONTROL (=TAKE CONTROL)See “ Accept logic flow chart “.

ACCEPT CONTROL at level 3 permissive for GTG :- Local/Remote switch on the level 1 switchboard mimic panel set to remote.- Port side local level 2 OS set to pass (for the one considered GTG set).- Stbd local level 2 OS set to pass (for the one considered GTG set).- Remote local level 2 OS set to pass (for the one considered GTG set).- IAS Alive Status OK.

ACCEPT CONTROL at level 3 permissive for STG :- Local/Remote switch on the level 1 Port switchboard mimic panel set to remote.- STCP set to pass.- IAS Alive Status OK.

Then operator can validate transfer by action on ACCEPT CONTROL soft push-button.A feedback from level 2 is given to IAS to confirm control transfer.

PASS CONTROL from level 3 to level 2 or level 1 operator station :

9 RS31-M00E937

Level 3 to level 2 : Level 2 “takes control” by action on ACCEPT CONTROL on level 2, the transfer operates immediately.

Level 3 to level 1 : Level 1 “takes control” by action on local/remote switch (set to local) transfer operates immediately.

The remote level 3 has the same means of control than level 2 except following particularities:- GTG mode is always in SPEED DROOP.- No means of manual speed control.- No manual synchro-coupling facility.

3.2.4-Particularities

Ethernet network failure (an alarm is released):-control is in level 1 : control stay in level 1 and can be only given to level 3, level 2 cannot take the control.-control is in level 2 : automatic control transfer to level 3 (if available), else Level 1 takes control manually.-control is in level 3 : control stay in level 3 and can be only taken by level 1, level 2 cannot take the control .

IAS failure (alarm is released):-control is in level 1 : control stay in level 1 and can be only given to level 2, level 3 cannot take the control.-control is in level 2 : control stay in level 2 and can be only be taken in level 1, level 3 cannot take the control.-control is in level 3 : then control must be transferred to level 2 (if Ethernet network OK) else level & takes control manually.

10 RS31-M00E937

11 RS31-M00E937

12 RS31-M00E937

4-Load control

4.1-Generalities The configuration of electric network depends on ship’s operational situation:

- in port : one gas turbine generator connected .The steam turbine generator connected if steam production sufficient ( See “Steam plant “ document”) . The second gas turbine generator is in standby.

- in manoeuvring : two gas turbine generators connected in parallel. The steam turbine generator is running idle.

- in open sea : one or two gas turbine generator connected (depending on propulsion power request) and the steam turbine generator connected in parallel .

The steam turbine generator is connected in parallel of GTG and its power depends only on the steam availability .

4.2-Load sharing and frequency control

The automatic load sharing and frequency control function from MAS are enabled if MAS is IN CONTROL , therefore load is on DROOP mode (level 3) .Based on the net frequency and generators load, the MAS controls the engine speed.The net frequency is compared with the frequency set point 60Hz and the generator actual load is compared with calculated load set point. In load sharing mode all generators connected are set at the same rate of power (% of max power).It’s possible to fix (through the keyboard) the load set point of a generator to allow its running at a constant load setting.Dead band for frequency and load deviations are included to reduce governors operation (to be adjusted during commissioning).The frequency and load deviations are integrated through time, and when the integration reaches a certain value, an up or down pulse with calculated pulse length from actual deviation is given to gas turbine governor(these parameters will be adjusted during commissioning).Automatic frequency control function in MAS is as following :

- One GTG connected : Frequency control is done with +/- speed on this GTG- Two GTG connected : Frequency control is done with +/- speed on this two GTG (+load sharing to

have same % of load on each)- One GTG and STG connected : Frequency control is done with +/- speed on this GTG. Load of

STG depends only on steam availability.- Two GTG and STG connected : Frequency control is done with +/- speed on this two GTG (+load

sharing to have same % of load on each). Load of STG depends only on steam availability.- One GTG and ADG (select as ADG) connected : frequency control is done with +/- speed on GTG

and ADG (+load sharing to have same % load on each). - One GTG, ADG (select as ADG) and STG connected : frequency control is done with +/- speed on

GTG and ADG (+load sharing to have same % load on each). Load of STG depends only on steam availability..

- ADG and STG connected : frequency control is done with +/- speed on ADG and STG. In this case IAS put automatically STG to speed droop mode (“Pressure control disable” is send to STCP. See chapter 4.7 for more details).

- ADG (select as ADG) connected alone : Frequency control is done with +/- speed on this ADG.- STG connected alone : Frequency control is done with +/- speed on this STG. . In this case IAS put

automatically STG to speed droop mode (“Pressure control disable” is send to STCP. See chapter 4.7 for more details)

13 RS31-M00E937

4.3-Start /Stop of GTG principle

4.3.1 Cascade ON/OFF principle

The power management system calculates the following data:- available power : nominal power - (actual power + bow thruster reserve power)- actual power : addition of generators power- bow thrust reserve power : 3 * 2,3 = 6,9MW in MANOEUVRING mode

Depending on power request from thruster control panel in Bridge : 2,3 MW per thruster.

- available power ratio : available power / nominal power * 100

The following parameters are available (to be adjusted during commissioning):- PSTART% : available power ratio threshold for starting of standby gas turbine generator- PSTOP% : available power ratio threshold for stopping of one gas turbine generator

CASCADE ON : if available power ratio is less than PSTART% during more than a certain time delay (time to be adjusted during commissioning) then MAS will start the standby gas turbine generator and connect it to the network .

CASCADE OFF : if available power ratio is more than PSTOP% during more than a certain time delay (time to adjust during commissioning) and if the propulsion is in OPEN SEA mode , then MAS will stop one gas turbine generator according to priority.

It should be possible to activate or not this function CASCADE ON/OFF with AUTO/MANU selector on Electric production Overview mimic.

4.3.2 Propulsion Generator request principle

In case of a propulsion generator request (input ‘’PORT PROP GEN REQUEST’’ item 1471 or, input ‘’STBD PROP GEN REQUEST’’ item 1470 ), MAS will start the stand-by GTG.Stopping of the second GTG will be done manually.

4.4-Load control strategy to avoid or limit black out

4.4.1 Generalities

Start-up time for a Gas Turbine which is ready and in stand by mode is about 90 seconds in case of quick start.We are therefore dependent on two possible normal operation conditions :

- Two GTG, with or without STG in operation.- One GTG and the STG in operation.

Under normal operation at sea and at moderate speeds, mode 2 will be used with the second GTG in standby. We are therefore, in case of a trip of the connected GTG dependent on the STG to stay on the net and supply the load as long as possible until the ADG started and connected and the standby GTG started. This requires a well defined load Control Strategy. The load control strategy shall ensure power on the main SWBD 11kV as long as possible during failure modes of the prime movers GTG 1 or 2 or STG.The load control strategy is managed by two major control systems, namely the Propulsion Control System and the MAS.The two systems are independent of each other and control their own auxiliaries.The two systems recognise the loading and the various machinery configurations and act correspondingly when a threat to the power balance and frequency is arising. The two systems have independent load measurements and breaker feedback from generators and bus-ties.

14 RS31-M00E937

In the course of the objective to keep the main SWBD 11kV under power as long as possible, propulsion power will be automatically reduced by PLS, consumers automatically tripped and reconnected by MAS when loading condition is normalised.The aim is to use in MAS critical alarms as input (from GTG TCP) to start actions such as starting the standby GTG the ADG and the EDG and to reduce and shed load as needed. The earlier such an critical alarm can be detected, the better chance to avoid black-out.In case of critical alarm on one GTG, his load is automatically decel to minimal load (7 MW ) after 2 seconds and is automatically stop 5 minutes after (by Netcom).

4.4.2 First scenario : One GTG on duty and one GTG in stand-by . STG on duty or not duty.A critical alarm occur on GTG on duty.

1st step :Start order to ADG by MAS.Start order to EDG by MAS. (it will be not connected)Quick start order to the GTG in stand-by by MAS.Electric Propulsion is reduced by its own system (PLS).Load shedding step 1 (Port and/or Starboard) by MAS of heavy consumers (see following chapter 4.5).

2rd step :As soon as right voltage on ADG, close order to ADG circuit breaker QHT601 by MAS.Synchronisation of ADG with the net and closing of circuit breaker QHT601 by Switchboard synchronisation system. The ADG supply the 11KV net.

3trdstep :As soon as MAS receive from stand–by GTG signal “READY TO SYNCHRONIZE”, it sends a close order to the generator circuit breaker. Synchronisation of stand-by GTG with the net and closing of circuit breaker by GTG synchronisation system in main switchboard.

4th step :Reconnection of heavy consumers : same as reconfiguration after Black-Out.

5th step :5 minutes after critical alarm, there is an automatic deloading of the GTG in failure and disconnection of the net by Netcom.

6th step :Stopping of EDG by the operator in emergency diesel room.

7th step :Open order to QHT601 by the operator through MAS.Deloading of ADG and opening of QHT601 done by MAS.Stopping of ADG by the operator trough MAS.

15 RS31-M00E937

4.4.3 Second scenario : One GTG on duty and one GTG in stand-by . STG on duty.Tripping of GTG on duty. STG supply alone the net.

1st step :STG is controlled in Speed Droop mode and insure frequency control of the net.Start order to ADG by MAS.Start order to EDG by MAS.Electric Propulsion is reduced to 0 by its own system (PLS) and will stay at 0 until one GTG is connected.Load shedding step 2 by MAS of heavy consumers (see following chapter 4.5).

2nd step :As soon as right voltage on EDG, open order to QFS602 and close order to EDG circuit breaker QFS600 by MAS (QFS600 will close only when QFS602 will be opened).The GTG auxiliaries starters are supplied through DGFS1 and DGFS2 connected to emergency net.Quick start order to the GTG in stand-by by MAS.

3rd step :As soon as correct voltage on ADG, close order to ADG circuit breaker QHT601 by MAS.Synchronisation of ADG with the net and closing of circuit breaker QHT601 by Switchboard synchronisation system. The ADG supply the 11KV net.

4th step :As soon as MAS receive from stand–by GTG signal “READY TO SYNCHRONIZE”, it sends a close order to the generator circuit breaker. Synchronisation of stand-by GTG with the net and closing of circuit breaker by GTG synchronisation system in main switchboard.

5th step :Reconnection of heavy consumers : same as reconfiguration after Black-Out.

6th step :Close order of bus tie between ADG and EDG switchboard (QFS602) by the operator through MAS.Deloading of EDG and opening of QFS600 (automatism in switchboard).Stopping of EDG by the operator in emergency diesel room.

7th step :Open order to QHT601 by the operator through MAS.Deloading of ADG and opening of QHT6001 done by MAS.Stopping of ADG by the operator trough MAS.

Two cases can disturb this scenario :

Case 1 : EDG and ADG not connected and tripping of STG circuit breaker by low frequency because of not enough steam = Black out (see black out sequence)

Case 2 : EDG connected and supply alone emergency net, ADG not connected and tripping of STG circuit breaker by low frequency on 11KV net because of not enough steam = BO on 11 KV net and 450 V switchboard (see black out sequence, step 3). Quick start of stand-by GTG is not interrupted.

16 RS31-M00E937

4.5-LOAD SHEDDING

Conditions described here-after will occur load shedding of some consumers. Condition described in previous chapter are included in this logics :

17 RS31-M00E937

Circuit breakers to be opened and auxiliaries to be stopped depending on load shedding step are defined in following table :

ITEM DESIGNATION LOOP ITEM Load shedding Load shedding Load sheddingstep 1 STBD step 1 PORT step 2

QHT 61 chiller 1 - VFGU1 1363 X XQHT 62 Chiller 2 - VFGU2 1364 X XQHT 63 Chiller 3 - VFGU3 1382 X XQHT 64 Chiller 4 - VFGU4 1383 X X

QHT 350 Chillers and cold rooms auxiliaries 1371 X XQHT 450 Chillers and cold rooms auxiliaries 1389 X XQHT 17 THRUSTER 3 1366 Special logic Special logic

QHT 713 GALLEY 1757 X X XQHT 714 GALLEY 1758 X X XQHT 226 SOUND & LIGHT 1750 X X X

HVAC RUNNING AUTORISATION 751 X X XQHT 10 STBD PODS Auxiliaries 1369 XQHT 20 PORT PODS Auxiliaries 1387 X

Special logic for TRUSTER 3 :

18 RS31-M00E937

4.6-GTG limitation

Some conditions as starting-up of boiler, boiler disturbance or no harmonic filters connected will cause limitation of GTG nominal power. This limitations can take place only if the two GTG’s are on duty.In any case operator will have possibility to ovverride this limitation using Reset push-button of associated GTG

4.6.1 Start-up of boiler At the staring up of 2nd GTG, its nominal power will be limited to 5MW during 20 min to ensure a soft temperature increasing in Boiler as required by supplier (Deltak).Limitation will be done by PMS in IAS. The maximum power available will be in this case 30MW (25+5).Propulsion Limitation (PLS) based on more loaded GTG will be also effective.

4.6.2 10 MW limitation In case of disturbance on boiler (all conditions are described in logic here-after) or no harmonics filters connected , GTG will be limited to 10 MW. This limit will permit to have at least 5MW available for each POD.This limitation information will be send to Propulsion System to ensure right limitation with PLS.

19 RS31-M00E937

20 RS31-M00E937

4.7-STG control

STG can be controlled in speed droop mode or in pressure control mode.Sped droop mode will be used when no GTG are connected to insure frequency control of the net and so to avoid BO.In normal use, STG will be in pressure control and will deliver power according to available steam.Pressure set-point can be only changed locally on STG PLC.

4.7.1 Connection on the net -As soon as MAS receive from STG "READY TO SYNCHRONISE", it sends a close order to generator CB QHT 300. Connection to the 11KV net in parallel of GTG is done by Synchronising unit in main SWBD.-5 sec after MAS receive "CB QHT 300 closed" and when pressure 4398 or 4402 is higher than 30,5 BARG, it sends "Pressure Control Enable". Then STG is in pressure control.

4.7.2 Disconnection of the net : 1°) Opening order to CB QHT300 by operator on IAS mimic : -"Pressure control Disable" send by IAS to STG (now in speed droop mode)-Deloading of the STG (via "STG speed lower" signal)-IAS activate output "Opening order of CB QHT300" as soon as current is below 5% of nominal current.-STG is disconnected and running at iddle speed.

2°) Running iddle modeIn this mode STG is running at iddle speed and is disconnected from the net.“IDDLE” pushbutton (on mimic 1.43) permit operator to select STG in Running iddle mode All others conditions to have STG in iddle mode are defined in Steam plant document M00E928 When “Iddle” output to STG PLC is activated all following action are done by STG PLC (Woodward 505) : selection in speed droop mode, deloading, disconnection and running at iddle speed.

4.7.3 Alarm reset and acknowledgement The philosophy is the same as for both GTG when control is at level 3:

- Alarm acknowledgement is done via Acknowledge pushbutton on IAS Keyboard- Alarm reset is done via pushbutton on mimic 1.43

21 RS31-M00E937

5- BLACK OUT SEQUENCE

5.1 TOTAL BLACK OUT

5.1.1 EDG available and ADG selected as ADG

All circuit breakers on 11 kV open except bus tie QHT30B, QHT30T, QHT60 and QHT600.Circuit breaker QFS602 are opened by lost of voltage (automatism in switchboards).

1st Step :- EDG starts by lost of voltage on emergency switchboard (automatism in switchboard).- Start order to ADG by MAS.

2nd Step : - Closing of QFS600 (automatism in switchboard). The GTG auxiliaries are supplied through DGFS1 and DGFS2 (connected to emergency switchboard).- If one GTG running before BO, quick or normal start order to GTG in stand-by (by MAS).Or if 2 GTG running before BO, quick or normal start order to the 2 GTG’s (by MAS). Before sending start order GTG, MAS is sending RESET to Netcom.

3rd Step :- As soon as right voltage on ADG then close order to QHT601 by MAS.- Stbd and Port 11 kV switchboard are supplied from ADG switchboard : time T1.

4th Step :- Close order to 450 V switchboard transformer primary circuit breakers QHT150 (T1 + X1), QHT250 (T1 + X2) by MAS. - open order to QHT713 – QHT714 by MAS (galleys supply). (T1 + X1)- open order to QHT226 by MAS (Sound and light supply). (T1 + X1)- Close order to electric substation loop QHT2 (T1 + X3), QHT7 (T1 + X4) by MAS. (see particular condition in “Electrical production and Distribution” document)

5th Step : -Close order to 450 V switchboard transformer secondary circuit breakers QF150 (T1 + X5),

QF250 (T1 + X6) by MAS (interlock in switchboard if no voltage on primary) . 450 V port and Stbd switchboard are alive.

6th Step :- As soon as MAS receive from stand–by GTG signal “READY TO SYNCHRONIZE”, it sends a close order to the generator circuit breaker.- Synchronisation of stand-by GTG with the net and closing of circuit breaker by GTG synchronisation system in main switchboard.- One GTG is connected on the net : time T2.- If second GTG have been started also, connection to net will be done as defined for first one.

7th Step :- Chronological restart of auxiliaries connected to 450 V switchboard by MAS. See “Electrical production and Distribution” document where this chronology is described.

8th Step :- Close order to 450 V POD auxiliaries switchboard transformer primary circuit breaker QHT10 (T2+ Y1) and QHT20 (T2+ Y2) by MAS.- Close order to 450 V POD auxiliaries switchboard transformer secondary circuit breaker QF10 (T2+ Y3) and QF20 (T2+ Y4) by MAS.

22 RS31-M00E937

9th Step :- Close order of electric propulsion transformer TR11MPE circuit breaker QHT11 by MAS (T2 + Y5).




13th Step :- Close order to Aft engine auxiliaries switchboard transformer primary circuit breaker QHT350 (T2 + Y9), QHT450 (T2+ Y10) by MAS.- Close order to Aft engine auxiliaries switchboard transformer secondary circuit breaker QF3 (T2 + Y11), QF4 (T2+ Y12) by MAS.

14th Step : - Restart of HVAC plant (tag 751) by MAS (T2+ Y13).- Close order to QHT713 (T2+ Y14), QHT714 (T2+ Y15) by MAS (galleys supply).- Close order to QHT226 by MAS(Sound and light supply). (T2+ Y16).

15th step :- Close order of bus tie between ADG and EDG switchboard (QFS602) by the operator through MAS.- Deloading of EDG and opening of QFS600 (automatism in switchboard).- Stopping of EDG by the operator in emergency diesel room.

16th Step- Open order to QHT601 by the operator through MAS.- Deloading of ADG and opening of QHT601 done by MAS (if I < 5 % I nominal).- Stopping of ADG by the operator trough MAS.

Variable X1 X2 X3 X4 X5 X6Value 0 2 4 6 8 10

Variable Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10Value 0 4 8 12 150 160 170 180 18 20

Y11 Y12 Y13 Y14 Y15 Y1622 24 30 34 38 42

23 RS31-M00E937

5.1.2 EDG not available and ADG selected as EDG

All circuit breakers on 11 kV open except bus tie QHT30B, QHT30T and QHT60.Opening of QHT600(automatism done in TPFS)Circuit breaker QFS602 open by lost of voltage (automatism done in TPFS)

1st Step :- ADG starts by lost of voltage on emergency switchboard (automatism done in TPFS).

2nd Step :- Closing of QHT601 (automatism done in TPFS).- Closing of QFS602 (automatism done in TPFS) : the GTG auxiliaries are supply through DGFS1 and DGFS2.- If one GTG running before BO, quick or normal start order to GTG in stand-by .(by MAS),Or if 2 GTG running before BO, quick or normal start order to the 2 GTG .(by MAS). Before sending start order GTG, MAS is sending RESET to Netcom.

3rd Step : - As soon as MAS receive from stand–by GTG signal “READY TO SYNCHRONIZE”, it sends a close order to the generator circuit breaker.- Synchronisation of stand-by GTG with the net and closing of circuit breaker by GTG synchronisation system in main switchboard.- One GTG is connected on the net : time T1.- If second GTG have been started also, connection to net will be done as defined for first one.

4th Step :- Close order to 450 V switchboard transformer primary circuit breakers QHT150 (T1 + X1), QHT250 (T1 + X2) by MAS.- Open order to QHT713 – QHT714 by MAS (galleys supply). (T1 + X1)- Open order to QHT220 by MAS (Sound and light supply). (T1 + X1)- Close order to electric substation loop QHT2 (T1 + X3), QHT7 (T1 + X4) by MAS. (see particular condition in “Electrical production and Distribution” document)

5th Step : -Close order to 450 V switchboard transformer secondary circuit breakers QF150 (T1 + X5),

QF250 (T1 + X6) by MAS (interlock in switchboard if no voltage on primary). 450 V port and Stbd switchboard are alive

6th Step :- Chronological restart of auxiliaries connected to 450 V switchboard by MAS. See “Electrical production and Distribution” document this chronology.

7th Step :- Close order to 450 V POD auxiliaries switchboard transformer primary circuit breaker QHT10 (T2+ X7) and QHT20 (T2+ X8) by MAS.- Close order to 450 V POD auxiliaries switchboard transformer secondary circuit breaker QF10 (T2+ X9) and QF20 (T2+ X10) by MAS

8th Step :- Close order of electric propulsion transformer TR11MPE circuit breaker QHT11 by MAS(T1+ X11)


24 RS31-M00E937



13th Step :- Close order of Aft engine auxiliaries switchboard transformer primary circuit breaker QHT350 (T2 + X15), QHT450 (T2+ X16) by MAS.- Close order of Aft engine auxiliaries switchboard transformer secondary circuit breaker QF3 (T2 + X17), QF4 (T2+ X18) by MAS.

14th Step - Restart of HVAC plant (tag 751) by MAS (T1+ X19).- Close order to QHT713 (T1+ X20), QHT714 (galleys supply). (T1+ X21).- Close order to QHT226 (Sound and light supply). (T1+ X22).

15th Step- Close order to QHT600 by operator through MAS.- Deloading of ADG and opening of QHT601done by MAS (if I < 5 % I nominal).- Stopping of ADG by the operator in Emergency room.

Variable X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12Value 0 2 4 6 8 10 12 16 20 24 150 160

X13 X14 X15 X16 X17 X18 X19 X20 X21 X22170 180 32 34 36 38 42 46 50 54

5.2 HALF BLACK OUT

This situation will be caused by over-current (or electrical fault) on one main switchboard. The result is :- QHT30B, QHT30T, [QHT250 - QF250] OR [QHT 150 – QF 150], QHT60, QHT600, QFS602 opened.- BO on one Main switchboard.

5.2.1 EDG available and ADG selected as ADG

1st Step :- EDG start by lost of voltage on emergency switchboard (automatism done in TPFS)- Start order to ADG by MAS because of BO on TPAHT. It will be connected by the operator if

necessary.

2nd Step :- Closing of QFS600 (automatism done in TPFS)

3rd Step - Closing of QF4001 and QF4002 by MAS : both 450 V switchboard are alive.

4th Step

25 RS31-M00E937

- Closing of QHT60, QHT600, QHT30B and QHT30T by operator to supply again TPAHT.

5th Step- Stop of ADG by operator.

6th Step- Close order of bus tie between ADG and EDG switchboard (QFS602) by the operator through MAS.- Deloading of EDG and opening of QFS600 (automatism in switchboard).- Stopping of EDG by the operator in emergency diesel room.

5.2.2 EDG not available and ADG is selected as EDG

1st Step :- ADG starts by lost of voltage on emergency switchboard (automatism done in switchboard)- Closing of QFS602 (automatism done in switchboard)

2nd Step :- Closing of QHT601 (automatism done in switchboard)

3rd Step :- Closing of QF4001 and QF4002 by MAS : Port and Stbd 450 V switchboard are alive.

4th Step :- Closing of QHT60, QHT30B and QHT30T by operator.- Closing of QHT600 by operator involve download of ADG and opening of QHT601 (done in TPFS)

26 RS31-M00E937

6-SHIP’S OPERATIONAL SITUATION CHANGEThe ship’s operational situation is selected by mean of a 3 positions switch PORT / MANOEUVRING / OPEN SEA located on ECR console .

6.1-PRESENTATION OF DIFFERENT MODE

6.1.1 - Port mode : - One GTG is running and is connected on the net.- The other GTG is stopped and in stand-by.- The STG is running (if sufficient steam) and is connected on the net.

6.1.2 - Manoeuvring mode : - Two GTG are running and are connected on the net- The STG is running (idling speed ) and is not connected on the net

6.1.3 - Open Sea mode : 1st step : ship speed less about 18 knots :

- One GTG is running and is connected on the net- The other GTG is stopped and in stand-by- The STG is running and is connected on the net

2nd step : ship speed over about 18 knots ,according to request power from propulsion system , PMS will start the stand-by GTG :

- Two GTG are running and are connected on the net- The STG is running and is connected on the net

6.2-PORT TO MANOEUVRING

The selection involves :-Running iddle mode for STG.-Standby Gas Turbine Generator starting and circuit breaker closing.-CASCADE OFF overridden.

6.3-MANOEUVRING TO PORT

The selection involves :-Cascade ON/OFF could be activate by operator : according to load, one Gas Turbine Generator can be automatically stopped.-Running iddle condition are removed and operator by using STG Reset pushbutton connect again STG.

6.4-MANOEUVRING TO OPEN SEA

The selection involves :-Running iddle condition are removed and operator by using STG Reset pushbutton connect again STG.-Cascade ON/OFF could be activate by operator : according to load, one Gas Turbine Generator can be automatically stopped.

27 RS31-M00E937

6.5-OPEN SEA TO MANOEUVRING

The selection involves :-Running iddle mode for STG.-Standby Gas Turbine Generator starting and circuit breaker closing.-CASCADE OFF overridden.

electrical philosophy

Documents