Relay station system for long-distance submarine superconducting cable

A relay station system for a long-distance submarine superconducting cable, wherein the relay station system is used for a submarine superconducting cable;

• the submarine superconducting cable comprises a housing and a cable body that is disposed in the housing;
• a cable cooling channel is disposed between the housing and the cable body;
• the cable cooling channel is configured to introduce a refrigerant;
• relay station systems are provided and spaced apart at a specific distance for the submarine superconducting cable;
• one of the relay station systems corresponds to a segment of the submarine superconducting cable;
• a housing of the segment of the submarine superconducting cable is partially stripped, to form a first transmission segment, a second transmission segment, and a third transmission segment;
• and the second transmission segment is the segment of the submarine superconducting cable of which the housing is stripped;
• the relay station system comprises:
• a shaft-type operation and maintenance platform, a refrigeration station, and a coolant circulation device;
• and the refrigeration station and the coolant circulation device are carried inside the shaft-type operation and maintenance platform;
• the coolant circulation device comprises:
• an inflow cooling pipe, an outflow cooling pipe, a first refrigerant storage tank, a second refrigerant storage tank, a first intermediate cooling pipe, and a second intermediate cooling pipe;
• the first refrigerant storage tank is located outside the second transmission segment;
• the first refrigerant storage tank is configured to provide the refrigerant for the second transmission segment;
• the first refrigerant storage tank is connected to an input of the second refrigerant storage tank through the first intermediate cooling pipe;
• a cable cooling channel of the first transmission segment is connected to the inflow cooling pipe;
• the inflow cooling pipe is connected to the second refrigerant storage tank;
• the second refrigerant storage tank is connected to a cable cooling channel of the third transmission segment through the outflow cooling pipe;
• the second refrigerant storage tank is connected to the first refrigerant storage tank through the second intermediate cooling pipe;
• and the refrigeration station is located in the second refrigerant storage tank;
• a refrigerant in the cable cooling channel of the first transmission segment enters the second refrigerant storage tank through the inflow cooling pipe, and after being cooled by the refrigeration station, the refrigerant enters the cable cooling channel of the third transmission segment through the outflow cooling pipe;
• and
• a refrigerant in the first refrigerant storage tank enters the second refrigerant storage tank through the first intermediate cooling pipe, and after being cooled by the refrigeration station, the refrigerant enters the first refrigerant storage tank through the second intermediate cooling pipe.