Submarine cable system and a switching method thereof

The method according to claim 1, wherein

• readjusting the tap positions of the first and second line reactors is done within 1.5 seconds after the submarine cable circuits are energized.

The method according to claim 4,

• wherein, in response to determining the first scenario, the tap positions of both bus reactors are determined to be related to the submarine cable circuit branch to be energized, and is adjusted for minimum compensation, and
• wherein, in response to determining the second scenario, only one of the bus reactors is assigned for and determined as related to the submarine cable circuit branch to be energized and the tap position of the assigned bus reactor is adjusted for minimum compensation.

The method according to claim 6, further comprising

• determining, based on a predetermined criterion, whether the onshore PMS has a failure;
• and
• switching the onshore PMS to a hot standby offshore. PMS in case the onshore PMS has a failure.

The system according to claim 8,

• wherein the system further comprises a Power Management System (PMS) connected to an first I/O controller, and
• wherein the first I/O controller is connected to the first circuit breaker and the first line reactor of the first submarine cable circuit branch, the grounded bus reactor and the third circuit breaker of the first bus reactor circuit, and the onshore BSP.

The system according to claim 9,

• wherein the PMS is connected to the first I/O controller via a first switch, the first switch is connected to a second switch, and the second switch is connected to a standby PMS.

The system according to claim 10,

• wherein the PMS is onshore and the standby PMS is offshore, and
• wherein the second switch is connected to a second I/O controller, and the second I/O controller is connected to the second circuit breaker of the first submarine cable circuit branch.

The non-transitory computer readable medium according to claim 12, wherein determining a submarine cable circuit branch to be energized comprises determining a first energization scenario and a second energization scenario, wherein the first energization scenario is that none of the submarine cable circuits is energized, requiring energization of one of the submarine cable circuits, and wherein the second energization scenario is that one of the submarine cable circuits has already been energized and the other submarine cable circuit needs to be energized.

The non-transitory computer readable medium according to claim 16, the method further comprising:

• determining, based on a predetermined criterion, whether the onshore PMS has a failure;
• and
• switching the onshore PMS to a hot standby offshore PMS in case the onshore PMS has a failure.