Mercado Objetivo

1. General Description

The Emergency Diesel generator is rated for 850kW at 450V, 60Hz for use in emergency or dry-dock conditions. The generator feeds the emergency switchboard and, through tie-breakers, the main switchboard. The unit will start automatically should the main running unit fail, or it can be started manually either from the emergency switchboard or engine starter panel.

Under normal operating conditions, the emergency switchboard is fed from the main switchboard through a tie-breaker, with the emergency generator engine operation switch in the auto condition at the starter panel. Under these conditions, a loss of voltage in the bus bars will be sensed thus, starting the emergency generator automatically and feeding electric power to the emergency switchboard.

1) Engine

The engine is a V-12 turbocharged diesel engine, running at 1,800 rev/min. The engine has an air start motor and a manual hand hydraulic system.

Crankshaft, camshaft and bearings etc. are lubricated by a forced lubrication system from an engine driven gear pump. The pump draws oil from the sump pan and, after passing through a cooler and a filter, a pressure regulating valve maintains the line pressure. Heating elements are fitted to the sump to provide preheating of the lub-oil and heating elements are also fitted to the cooling water jacket. These are normally left on.

An engine-mounted radiator with v-belt driven fan cools the jacket water, and an engine driven pump circulates the water through the jacket spaces.

Fuel is supplied from the 5.0m3 _{emergency diesel generator oil tank} located in the emergency generator room, gravity fed to the fuel injection pump. Air for starting is supplied from a separate air reservoir, which is topped up by the engine-driven emergency diesel generator starting air compressor or generator engine starting air compressors. Start air is supplied to the starter motor after initiating the operation of a solenoid valve in the line.

2) Generator

The generator gives an output of 850 kW at 450 volt 3 phase 60Hz at 1,800 rev/min. The generator is a brushless type self-excitation, self- regulation system with automatic voltage regulator maintaining a constant output. A space heater coil is fitted to the generator enclosure to prevent condensation while the unit is idle.

The generator is coupled to the emergency switchboard via a circuit

breaker, which is closed automatically by the engine starting sequence or manually at the emergency switchboard. Manual control of voltage is provided together with voltage, current and frequency meters at the emergency switchboard.

The Emergency Generator starter panel in the emergency generator room has two positions: AUTO and MANUAL with START and STOP pushbuttons.

The Emergency Switchboard EG section has three (3) selector switches: engine control mode ‘AUTO/MANUAL’, E/G mode ‘EMCY/FEED BACK’ and test switch ‘TEST/NORMAL’ for controlling the emergency generator set.

When a no-volt signal is received at the emergency switchboard, this initiates the engine start sequence. On receipt of the signal, the lub-oil heater and generator heater are switched off, the air start solenoid operates and air is admitted to the starter motor. The generator ACB on the emergency switchboard will be closed automatically when the engine is running at the correct speed and voltage.

In the MANUAL position, the generator can be started and run manually. Starting may be by manually operating the air start solenoid valve and, when the generator is running, the circuit breaker can be manually closed on the switchboard. Interlocks prevent the closure of the circuit breaker when the emergency switchboard is being fed from the main switchboard through the ACBs ELM1 and ELM2.

2. System Capacities and Ratings

Emergency Generator Engine: Cummins

Model KTA38 Combustion system Direct injection

Aspiration Turbocharger & after cooler

Bore / stroke 159 / 159 mm Firing order 1L-6R-2L-5R-4L-3R-6L-1R -5L-2R-3L-4R Emergency Generator: Rating 850 kW, 1062.5 kVA at p.f. 0.8 Voltage 3 x 450V 3. Operating Procedures

1) To Start the Generator Only at the engine starter panel.: (1) Check the engine lub-oil sump level and top up as required. (2) Set the engine starter panel switches to the MANUAL position. (3) Check the fuel tank level, check for water and top up the tank as

required.

(4) Open the fuel tank outlet quick closing valve and ensure that there is fuel at the filters.

(5) Check the air start receiver air pressure. Drain off any moisture. (6) Open the receiver outlet valve and the air line to the starter-motor. (7) Push the START button, the engine will receive a start signal.

(8) When the engine is started, check instrumentation and for leaks around the engine.

2) To Start the Generator from manual hand hydraulic system (1) Carry out checks and inspections as above.

(2) Set the engine starter panel switches to the MANUAL position. (3) Check that the feed tank is filled to the correct level with approved

hydraulic fluid.

(4) Raise pressure to between 28.1 and 35.1MPausing hand pump. (5) Pull the relay valve operating lever, the engine will be started by

hydraulic power.

(6) When the engine is started, check instrumentation and for leaks around the engine.