According to a 2021 report by the United Nations Environment Programme, "In the past 10 to 12 years, the total carbon dioxide emissions from human activities have reached about 40 billion tons. The voice calling for the reduction of anthropogenic emissions is rising year by year, and achieving "carbon peaking" and "carbon neutrality" has become another major change in the concept of global sustainable development.
If you still feel that the "double carbon target" is still far away from you, then now, you should hurry to make up the lessons:
Carbon peaking refers to the process of carbon dioxide emissions reaching the highest value at the highest value, and then entering a continuous decline through the platform period, which is also a historical inflection point for carbon dioxide emissions to increase and decrease.
Carbon neutrality refers to minimizing carbon dioxide emissions from human activities through energy efficiency improvement and energy substitution, and then offsetting carbon dioxide emissions through other means such as forest carbon sinks or captures to achieve a balance between sources and sinks. In order to work together to promote the implementation of the national "carbon peak" and "carbon neutrality" goals, various port departments and shipping companies have shown their magic, and one initiative after another such as ship shore power system, clean energy, and exhaust gas treatment devices have been applied to ship emission reduction actions.
In terms of shipping air pollutants and greenhouse gas emission reduction, many terminals have begun to build shore power devices in recent years, so how should ships with shore power receiving devices connect to use shore power when they berth the corresponding docks?
Shore power system Shore power system refers to the equipment that supplies power to the ship at the port during the normal operation of the ship, including shipboard devices and shore-based devices; Replace the ship's fuel oil supply through shore-based power supply, replace "oil" with "electricity", and achieve the goals of "zero fuel consumption" and "zero emission" from the source. Among them, the rated voltage (phase voltage) of shore power supply below 1kv is low-voltage shore power, and the rated voltage (phase-to-phase voltage) is 1kv to 15kv for high-voltage shore power. Because of its high power, easy connection, and seamless switching, high-voltage shore power is favored by large ships. Next, Xiaobian will use the picture to show you the main links of the use of shore power connections", please note: Some of the operation methods and indicator values vary due to specific ship-shore high-voltage shore power systems, and are for reference only.
01Preparation before power is received
Before the ship arrives at the port, confirm with the docker the direction in which the ship is docked, the power/voltage of shore power and other parameters, confirm how to communicate with the ship and shore, and make preparations before receiving electricity;
Check whether the auxiliary and control circuit power supply is good (ac380v, ac220v, dc24v);
Confirm that the weather conditions are good, the wind is less than 7, the wharf cannot operate normally in bad weather (typhoon, hail, lightning, heavy rain), and it is forbidden to connect high-voltage shore power;
Check and remove the remnants of the high-voltage shore power room and keep the shore power room clean and tidy;
Check the high-voltage shore power operation identification plate, the name of each equipment is normal and complete, and the relevant tools and instruments such as: vcb operation handle, ground switch handle, and insulated rocking table are normally available; (here vcb refers to the high-voltage switch of the ship's high-voltage cabinet)
High voltage shore power room high voltage cabinet & transformer cabinet
Operational flow
Ground switch handle
High voltage switch
Confirm that fire fighting equipment is available in the high-voltage shore power room;
Confirm that the walkie-talkie is normal and the guardians at each point maintain contact;
Confirm that the lighting and ventilation of the high-voltage shore power room are normal, check whether the cooling fan of the high-voltage transformer is in the automatic position, or start it directly manually, so as not to cause the transformer temperature to be high after power-on and lead to the separation of the high-voltage power cabinet vcb;
Lighting is normal
The fan switch is normal
The fan is turned on normally
High voltage shore power room lighting is normal & ventilation is normal
Check whether the emergency cutting device is normal;
Check whether the operation condition of the cable winch equipment is good;
Check the isolation rope, warning sign (high voltage danger, do not approach) and other facilities are ready to ensure that after the shore power is connected, the safety of the receiving equipment is safely isolated from the outside world.
Shore power system <<<
02 High voltage electricity measurement insulation before boarding (high voltage cabinet operation)
Check the system power ac380v, ac220v, dc24v off;
Communication mode selection: Please select the corresponding communication mode according to the requirements of the berthing dock
Operate the high-voltage cabinet grounding switch "earth switch" to break it;
Shake the high-voltage cabinet contact switch into the "connection" position;
Open the back end cover of the high voltage feeder box, unplug the high voltage cabinet instrument road fuse, and measure the insulation of the high voltage cabinet;
Normal insulation (greater than 500 MΩ, minimum not less than 7.8 MΩ), resembling fuse;
Power on the amp system.
03 High voltage electricity on board the ship to establish optical fiber communication
Shake the high-voltage cabinet contact switch out to the "dissconnection" position, and operate the high-voltage cabinet grounding switch "earth switch" to close it to ground;
Lower the cable by cable winch;
Notify the shore-based personnel to plug in the amp plug and check whether the optical fiber communication is normal;
After the confirmation is completed, the amp system issues a "connection request" after the shore base receives the signal to confirm that the shore base status is normal, and then automatically issues the "accept connection". (The step is automatically confirmed by the system, and the operator contacts the intercom);
After receiving the "accept connection", the crew on board opened the lower end cover behind the high-voltage feeder screen, unplugged the high-voltage cabinet instrument road fuse, and operated the high-voltage cabinet grounding switch "earth switch" to break it;
Shore-based personnel begin to do insulation testing, and after the test is completed, shore-based personnel automatically send "cold ready";
After the crew on board receives the "cold ready", they operate the high-voltage cabinet grounding switch "earth switch" to close it and ground it and reload the fuse;
Operate the high-voltage cabinet grounding switch "earth switch" to disconnect it, and shake the high-voltage cabinet contact switch into the "connection" position;
The high-voltage cabinet display "power request avail" state is normal, and the high-voltage cabinet is in a standby state;
After confirming that the high-voltage request is valid, the ship's personnel operate the "power request" switch, and the "power request" status is displayed normally;
After the shore-based system receives the "power request" signal, it will send "shore ready", and the amp system will issue a shore-based high-voltage switch closing command after receiving the signal, and the high-voltage electric supply ship after closing the gate, check the high-voltage voltmeter, frequency table, phase sequence table, and manually close the high-voltage cabinet high-voltage switch after confirming normal;
Check the high voltage voltmeter, frequency meter, phase sequence table
&Closing high voltage cabinet high voltage switch
At this time, the high-voltage power will be sent to the engine room distribution board through the transformer, the standby auxiliary machine is placed in the manual position, the auxiliary machine is placed in the automatic, pressed in the centralized control room to automatically switch to shore power, and after all the ship power is transferred to shore power, the main generator will automatically stop after 3 minutes of no-load operation.
The spare auxiliary machine is placed in the manual position, and the auxiliary machine in use is placed in the automatic position
& Press to automatically switch to shore power
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