On behalf of the bypass road must be considered when calculating energy

On behalf of the bypass path must be considered when calculating the energy, increasing the computational  Voltage stabilizer . There tie breaker failure or for maintenance, you must change the substation operation mode, increasing the difficulty of scheduling and  power transformers  complexity. 220kV single circuit breaker system with bypass connection mode transformer unit doubles as a tie breaker breaker pair of wiring large power plants abroad or more than 110kV substation with dual breaker wiring, so that components work simultaneously in a double busbar , either a circuit breaker can quickly repair operation.