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1、SINOCREW MARITIME SERVICES PTE LTD BASIC KNOWLEDGE OF ENGINE ROOM ELECTRICAL EQUIPMENT SAFETY PRECAUTIONS DURING ELECTRICAL MAINTENACE:Give as many precautions as you can indentify:1. Make sure the power is off, if have control fuse remove it;2. Work areas should be well lighted, and keep working ar
2、ea clear;3. Ware safety PPE, and pay attention at this work at any time;4. Make sure to make notice like “MAN AT WORK, DO NOT OPERATE.” To show other People that sb. Is working.5.Tools should be will insulation & good condition6. To check electrical isolation check list.MAIN SWITCH BOARD3.1.1 Explai
3、n briefly safety incorporated in Main Switchboard:-Handles for opening the doors on switchboard cubicles are usually linked to an isolating switch. This ensures that supplies to components in the cubicle are switched off before the door opened.Fused isolators are isolating switches that incorporate
4、fuses. The action of opening the switch isolates the fuses so that they can be replaced safety EMERGENCY SWITCH BOARDIndentify all machineries fed from Emergency power supply in MSB:-No.2 steering gear -No.3 E/R fan-No.1 radar-Bo sun store lighting transformer-Emergency A/C110transformerSafety inter
5、locks to run Emergency generator while MSB is alive:-When the MSB is alive, to run the emergency generator the bus tie switch will give a signal that the E/G could not put on load. -NVRPowerAIR CIRCUIT BREAKERRoutine Check, Maintenance& Interval:-A visual examination of circuit breakers in main, eme
6、rgency and section boards will usually precede operational tests. The surveyor will particularly check the condition of main arcing and auxiliary contacts for signs the wear, misalignment and overheating. A similar inspection of fixed and moving isolator contacts at the rear of a circuit breaker wil
7、l be made.Arc chutes must be clean, free of arc debris and correctly aligned. All internal wiring should be iExplain briefly the type and working principle of the Diesel Generators on board-The diesel generators speed is accurately managed by an electronic fuel governor which maintains an almost con
8、stant output frequency over its load range ALTERNATORSExplain briefly the type and working principle of the shaft generator on board-A propulsion-shaft driven generator can be an efficient method for extracting electric power from the ships main engine as the power is derived from lower cost fuel th
9、an that used for an auxiliary driven generator unit. The shaft generator may be fitted directly in-line with the slow speed propulsion shaft or, more commonly, is gear-driven up to a higher speed.Also, by using a shaft generator as the main source of electric power during long sea passages, the driv
10、en generator units operate for short periods only with a reduced maintenance requirement. An apparent disadvantage of a shaft generator is that it has no direct frequency control as this is determined by the main engine which is set for the ships full-way speed range. The means that the frequency mu
11、st be separately regulated at the output of the shaft generator to maintain a constant 60HZ to the ships electric power consumers.MOTORSDetailed procedures on complete overhaul, with precautions:- Feed up the electrical isolation certificateSwitch off the power and remove the control fuse, to make s
12、ure the overhaul motor power is cut off. And make a notice to make sure that overhaul time no body operator it.Disconnect the connection and check the insulation, after that remove rotor and check the bearing if the bearing no good take out. Clean all the equipments and check the insulation of coil
13、side, and spring the varnish, and put the heat lamp to dry it and check the insulation. After dry up put back the rotor and tow side cover, check the motor to make the motor is in good condition. Then put back the motor into original place and put back the control fuse and switch on the power and te
14、st run.INSULATION MEASUREMENTNecessity of Insulation check on equipments -On board the ship a measurement of the insulation resistance gives one of the best guides to the state of health of electrical equipment. The resistance should be measured between insulated conductors and earth, and between co
15、nductors. Values & Evaluation of Readings:Best when New-100M500MAcceptable in service-1MNot acceptable to put in service-Less than 1MWhat happen if operated with unaccepted level of Insulation?-It can be damage the instrument or electrical control. Necessity of Insulation check on Cables and light f
16、ittings:-To make sure any cables short circuit or shorted to earth. WINDLESS AND WINCHSafety interlocks incorporated in starter panel, Provide logic diagram-Over load interlock-Oil pressure high -Oil temperature high STEERING GEAR SYSTEMList out various safety interlocks incorporated in system-Over load interlock-Phase fail interloc
