What is the meaning of auxiliary transformer, sub-variable and box change What is the difference (in addition to the capacity difference), how to work with, thank you
Is a dual power supply, usually with a large transformer used as a common, small transformer used as a backup, when the circuit with the fault, cut off in use, put on the spare, the overall is a dual power supply!
box change is box-type transformer, that is, transformers and supporting the protection system, , Metering system, remote control system integrated into a box, generally used for urban district power supply, field power supply field.
During the main transformer failure or overhaul, the auxiliary transformer provides the substation's own electricity. Maintenance of substation lighting, high and low voltage switch action, with the cabinet switch operation, for instrumentation and automatic control system work, sub-change can be box change,
