Instruction for recovery of power generating plant after blackout

ENGINEER ON WATCH:

1. Change over the control level to ER
2. Inform duty officer by phone about blackout and estimated time for engine recovery
3. Stop the main engine
4. Sound engineer alarm
5. Start stand by diesel generator
6. Switch on synchronoscope and main circuit breaker running DG on main switchboard
7. Restart all pumps in following sequence:

• ME LO pump
• ME SW cooling pump
• ME FW cooling pump
• Piston cooling pump
• Boiler feed pump
• Check whether ME AUX blower is on auto mode

CHIEF ENGINEER:

1. Check all ME service system parameters and reset ME shut down button
2. Ring “DEAD SLOW AHEAD” by telegraph
3. Upon positive replay from bridge – start ME

ENGINEERS:

1. Check and restart all AUX systems
2. Check and restart the boiler
3. Check all running pumps in engine room for leakage and proper temperature
4. Restart A/C compressor; domestic fridge (ECR); A/C cooling pump

EL. ENGINEER:

1. Investigate reason of blackout to avoid reocurrence
2. Switch on ESB LINK circuit breaker
3. Stop emergency generator
4. Restart all consumer’s breakers

The anemometer gives false readings. Troubleshooting

Greetings readers! Today we have a problem with the anemometer, which shows the wind speed and direction on the bridge. The readings were stuck in one direction (opposite to the wind). At this speed the wind is displayed correctly.

What is an anemometer?

An anemometer (or anemoscope) is a weather vane that consists of a generator, a synchronous motor, bearings, gear guides, rings and a brush device. All this can be said in one name - transmitter.

Procedure of restoring of power after black out on the vessel (example)

Vessel has 3 Main Diesel Generators; Power is supplied by one DG under normal operation at sea and in port. The other two DG is in place on 1st Standby and 2nd Standby accordingly. 

Power is restored after a blackout in the following process: 

AFTER A POWER BLACK OUT, EMERGENCY GENERATOR IN AUTO STAND BY STARTS UP AUTOMATICALLY AND POWER CAN BE BACK UP BY EMERGENCY GENERATOR IN LESS THAN 15 SECONDS. 

(E/G is started by battery power. If it not starts automatically, we have to manually start by switching to "MANUAL" mode position and Push Engine "START BUTTON" switch.) 

INTERCONNECTION BREAKER WITH "MSB" IS SWITCH-OFF AND THE E/G BREAKER IS SWITCH-ON AUTOMATICALLY. POWER IS NOW SUPPLIED FROM EG "ESB". 

WITHIN SECONDS FROM BLACK OUT TiME, AFTER EMC'Y GEN. STARTED AND POWER IS SUPPLIED FROM E/G "ESB", THE 1ST STANDBY MAIN DG STARTS UP AUTOMATICALLY AND GET ON LOAD. 

IF THE 1ST STANDBY MAIN DG FAILS TO START AUTOMATICALLY THE 2ND STANDBY MAIN D/G STARTS UP AND TAKE ON LOAD AUTOMATICALLY. 

If both the standby Main Diesel Generator fails to start automatically, we have to start at engine side and take it on load manually. Check that the reserve main air bottle no.2 must always be full. (Proceed to manual starting as per Starting Sequence as posted).

WHEN THE MAIN DIESEL GENERATOR GET ON LOAD, THE EMERGENCY GENERATOR BREAKER TRIPS, INTERCONNECTION BREAKER "SWITCH-ON" AND "ESB" HAVING POWER FROM "MSB". 

MAIN POWER IS NOW RESTORED. AS POWER IS RESTORED ALL AUXILIARY MACHINERY/PUMPS RUNNING IN OPERATION BEFORE THE BLACK OUT STARTS UP AUTO-SEQUENCIALLY ACCORDING TO PRIORITY SETTING INTERVAL IN SECONDS. 

STOP EMERGENCY GENERATOR MANUALLY AND RESET TO AUTO-STANDBY. 

CHECK THE CAUSE OF THE POWER BLACKOUT AND RECTIFY. 

OPERATE OR PUT TO STANDBY THE OTHER MAIN D/G AS REQUIRED.

Automatic Control of the Shaft Generators

When the order is issued for the main engine to operate at a constant speed corresponding to the correct frequency, and if the load on the distribution network is not in excess of the maximum permissible load on the shaft generator, and if no alarm is operative on the shaft generator, this combination of conditions is indicated on the control panel by the "shaft generator ready" lamp lighting up.

The generator then rotates at the correct speed although without excitation, i. e. it generates no voltage.

If the change-over switch on the control panel is set to the "shaft generator on" position the generator will be excited and will generate a voltage. When about 85% of the normal voltage is attained, control of excitation shaft generator will be taken over by the voltage regulator in the switchgear.

The diesel-driven generator or generators supplying the distribution network are then synchronized to the shaft generator by the synchronizing unit in the shaft generator unit. When the generators are running in synchronism, the shaft generator breaker will receive a closure signal from the automatic control equipment.

When the shaft generator is in service and no alarm is operative, a shut-down signal will be applied to all diesel-driven generators. These generators will be unloaded, and the circuit breakers will then trip the generators from the distribution network. The diesel engines will then be stopped.

A synchronizing alarm will be initiated if the shaft generator is not synchronized to the network within about one minute. Other alarms in the equipment indicate high voltage, high frequency, low voltage and low frequency.

All alarms can be delayed by an adjustable period ranging between 1 second and 60 seconds. If a shaft generator alarm should become operative the number of diesel-driven units necessary to replace the shaft generator will then be started immediately and will be synchronized to the network. When a sufficient number of diesel-driven units are in service, the shaft generator will be unloaded and its circuit breaker will be tripped.

If no diesel-driven unit is synchronized to the network after an adjustable time delay, the shaft generator breaker will trip and blackout will occur. The time delay for tripping the shaft generator circuit breaker can be set at any value between about 1 second and 60 seconds. The black-out will last only about 1 second, since the necessary number of diesel-driven units are already in service, although not synchronized to the network.

In automatic electrical power plants using shaft generator additional shaft generator control unit is installed for automatic change over of the power supply between the shaft generator and the diesel-driven generators.

The shaft generator unit provides the following functions:

1. Excitation of the shaft generator.
2. Synchronization to the distribution network and closure of the circuit breaker.
3. Unloading and shutting-down of the diesel-driven generators operating in parallel
4. In the event of an alarm on the shaft generator, changing over from this generator to the stand-by generators.
5. Switching a diesel-driven generator onto the distribution network and unloading of the shaft generator when "Shaft generator off" is requested.
6. Field suppression on the shaft generator after tripping.

Lloyd's Register of Shipping Certificate for AC Generator or Motor

This is to Certify that the auxiliary propulsion AC generator/stator, particulars of which are given below, has been inspected by me at the Makers' works. The construction, workmanship and materials are good, and the machine complies with the relevant of the Society's Rules.

On completion the generator/motor was tested with satisfactory results.

This certificate is issued upon the terms of the Rules and Regulations of the Society, which provide that:

The Committees of the Society use their best endeavours to ensure that the functions of the Society are properly executed, but it is to be understood that neither the Society nor any Member of any of its Committees nor any of its Officers, Servants or Surveyors is under any circumstances whatever to be held responsible or liable for any inaccuracy in any report or certificate issued by the Society or its Surveyors, or in any entry in the Register Book or other publication of the Society, or for any act or omission, default or negligence of any of its Committees or any Member thereof, or of the Surveyors, or other Officers, Servants or Agents of the Society".