The transmission tower is the support point of the overhead line. If one circuit is erected on the transmission tower, it is a single-circuit transmission tower, and if two circuits are erected on the transmission tower, it is a double-circuit transmission tower. Single loop refers to a loop with one power supply for a load; double loop refers to a loop with two power supplies for a load. Generally, enterprises with high requirements on power supply reliability, or important substations in the region, use double-circuit power supply, which can protect one of the power sources from power failure, and the other power source can continue to supply power. However, the general requirements for power supply reliability are not High and small users often use a single power supply.
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