Transformer system applied to offshore converter station and offshore converter station

The invention provides a transformation system applied to an offshore converter station and the offshore converter station. The transformation system comprises a first transformer and at least one transformer pair; wherein the transformer pair comprises two second transformers, each second transformer is connected with the high-voltage side of the first transformer, the low-voltage side of each second transformer is provided with two sections of second buses, the low-voltage side of the first transformer is provided with first buses connected with the second buses in a one-to-one correspondence mode, and the first buses are connected with the second buses in a one-to-one correspondence mode. The first bus and the second bus are provided with incoming line circuit breakers, and the second bus is connected with the first bus through a bus circuit breaker; when the voltage transformation system operates normally, the bus circuit breakers are in an open state, and the incoming circuit breakers are in a closed sta