Marine electrical equipment knowledge

August 22, 2022

The increase of the source voltage is connected to the step-down diode, and when the voltage is lowered, it is bypassed to achieve load regulation.
What is the common maintenance management method for electrical equipment?
The power supply composed of the charger and the storage battery, and the DC power supply system composed of the power supply to the load, that is, the "charge and discharge board" is an essential equipment for the ship.
Touch: the temperature and vibration frequency of the uncharged part of the electrical equipment (with the back of the hand);
Test: various operating parameters and resistance values ​​of electrical equipment;
Do: Regular and irregular inspection and maintenance of electrical equipment.
Look: the appearance of the components of the electrical equipment and related monitoring indicators;
Listen: changes in the sound of electrical equipment when running (can be used to listen to the stick);
Smell: the smell emitted by electrical equipment (such as the burnt smell of various materials);
How to maintain the electrical equipment on board during the factory repair?
(1) Pay attention to the waterproof and moisture proof of electrical equipment and motors;
(2) It is forbidden for workers to arbitrarily connect power sources and wires;
(3) Carefully inspect and accept the repair project of the factory;
(4) The anti-sea biological anode protection system should be turned off when docking. Zui is good to open 24 hours after docking to prevent damage to the paint layer that has not been firmly damaged by the action of electricity ions. (In addition, the current value should be adjusted according to different navigation waters)
What is the attention of the deck to the electrical equipment of the bow when the ship is sailing in the storm? The charger works differently or the battery state is different, and the power supply voltage is often much higher than the rated voltage required by the load.
A: During the voyage of the wind and waves, Zui is good off the power supply of the motor such as the decker and the anchoring machine from the main switchboard of the engine room control room to prevent the electric appliance in the control box from being burned out once the water enters. Before the power is transmitted again, it must be confirmed that the circuit system is insulated normally;
B: After the voyage of the wind and waves, even if the ship does not have water, it is necessary to check the motor and its electrical insulation before sending power to prevent the motor and other electrical equipment from burning out. In the winter, pay special attention to the drying and moisture protection of the motor and its related electrical appliances.
4. Talk about the regular inspection and maintenance of the electric control system of the deck electric hydraulic lifting machine.
The main inspection and maintenance contents of the gramling: the wiring of the control box, the condition of the electromagnetic contactor, the relay contact and the flexible state of the armature mechanism, whether the status and function of each switch and the interlocking function of each relay are normal; some control boxes and motors It is equipped with a moisture-proof electric heater. Check whether the work is normal. If the motor is insulated or bearing, if it is an oil-cooled immersion motor, it must be absolutely guaranteed that the hydraulic oil has no impurities and no water ("McKia"); Some of the travel switch connected with the joystick are fixed in position and wiring; whether the status and position function of each solenoid valve, pressure switch, temperature switch, liquid level switch, limit switch used for control or protection are normal; The condition of the carbon brush slip ring assembly, the surface of the slip ring, the length of the carbon brush, the spring condition, the fastening of the wiring insulator, and the watertight condition of the component box; and the watertightness and insulation of the deck power cable box, the bottom of the box should be opened periodically. Drain the screw to check whether there is any water inside, check the cable protection tube for cracks, the expansion joint is good, pay attention to keep the power Dry and clean the interior of the splice box. The 24V acid battery zui high charging voltage is generally up to 28.2V, or higher. Alkaline batteries can be as high as 31V or even 36V. It is not appropriate to supply 24V ship load.
5. When changing the deck crane arm or hook wire, it is often necessary to adjust the position of the limit switch. How should the simple method of Zui be operated? In order to meet the load power requirements, it is more economical to install a VR1 DC buck regulator between the power supply and the load.
The simple method of zui is to release (or detach) the conveyor chain or transmission wire connected to the limit switch box after the boom or hook head is placed in a certain position, so that it does not follow the wire drum, etc. After the wire is good, it can be reset.

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