The scheme (A) is a two way high voltage power supply, which is normally used for one time, that is, when the power supply of the normal power supply fails, the other backup power supply is automatically put into operation. The engineering application will be two-way power as standby for each other, this will bring some flexibility for the power supply department operation, the power supply scheme in China's current power is not very adequate under the condition of appropriate. As long as the 100% load in a loop is technically not what difficulties, this scheme has certain advantages, it can reduce the intermediate bus connection cabinet and a voltage transformer cabinet, to save construction investment and reduce the high voltage distribution room construction area are favorable. When the standby circuit is in the normal state, the substation can be found at any time. The scheme (B) is a two way power supply working at the same time. When a fault occurs, the power supply is switched on by the bus connection switch. Compared with the scheme (A), the bus contact cabinet and the voltage transformer cabinet are increased, and the area of the transformer substation is increased. Scheme (C) for the three way power supply, normal dual-use equipment, when any work when the power failure, the standby power switch to the fault circuit power supply, automatic interlock circuits can be designed with the scheme (A), which are reserved for each other, make the power system more flexible scheduling. Standby power supply for standby line fault monitoring (B). Scheme (D) for three way power supply. Power supply and power! "And the power supply and power # $, through the intermediate bus tie switch mutual standby. This scheme is more than the program (C) to increase a power cabinet and a voltage transformer cabinet, the construction area is also increased.
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