What is the distributed optical fiber sensing technology?
Submarine high-voltage cable simulation (omitted)
This article uses ANSYS simulation software to establish a 220kV three-core XLPE insulated power cable simulation model.
Temperature and electric field distribution diagram during normal operation of the cable
From the simulation results, it can be seen that the maximum internal temperature of the submarine high-voltage cable is 75℃ and the maximum field strength is 11.4MV/m when the submarine high-voltage cable is operating at full load. According to operating experience, the maximum internal temperature of the cable during normal operation does not exceed 90℃, and the maximum field strength is not More than 35MV/m.
Compression simulation of submarine high-voltage cables
The submarine high-voltage cable is squeezed by external forces such as ship anchors, and the pressure received by the submarine cable and the pressure distribution curve detected by the internal optical fiber sensor are obtained through simulation, as shown in Figure 2.2.
Pressure distribution and axial curve along the line under pressure
From the simulation results, it can be seen that when the submarine high-voltage cable is squeezed by an external force, the internal pressure of the cable also changes. From the axial pressure curve, it can be seen that the pressure of the submarine high-voltage cable is higher than the other non-compressed positions. Therefore, the distributed optical fiber strain sensor can be used to monitor the changing strain inside the submarine high-voltage cable, and thus locate the location of the cable under compression.
Simulation of damage to cable armor layer
When the submarine cable is subjected to an external force for a long time, or the external force exceeds the limit of the cable armor layer in an instant, it is easy to cause damage to the armor and affect the insulation of the cable. We simulate the changes in the internal temperature field and electric field of the submarine cable in the three cases of armor layer damage, armor layer + filling layer, armor layer + filling layer + insulation layer.
Submarine cables are damaged to varying degrees, and the temperature field and electric field inside the cable will change. When the armor layer of the submarine cable is damaged but not penetrated, the temperature field and electric field inside the submarine cable do not change significantly from normal conditions, indicating that the submarine cable can maintain normal operation for a period of time without damage to the armor layer time.
If the damage reaches the filling layer, the internal temperature field and electric field strength of the submarine cable will hardly change. However, because the rigidity of the filling layer is not enough to withstand deep water pressure, the submarine cable will have a short-circuit failure in a short time. The most serious is that the damage reaches the insulation layer. Not only is the insulation layer far less rigid than the armor layer, but more serious is that the electric field strength inside the submarine cable will rise sharply, causing the cable insulation layer to breakdown due to the high field strength.
In conclusion
This article uses ANSYS to simulate the external force damage of the submarine high-voltage cable. When the submarine cable is squeezed by the external force, the pressure outside and inside the cable will change. If the pressure continues or increases, it will affect the safe operation of the submarine cable. create a threat. Through simulation research, we found that the changes in the pressure field of the submarine cable can be reflected through the optical fiber sensor inside the submarine cable, and the location of the fault can be monitored, providing a basis for rapid troubleshooting.
This article is from Allicdata Electronics Limited which offer electronic components, semiconductors, antennas, capacitors, connectors, diodes, transistors, IC,resistors. For more product information, please go to the website to get it.