High-reliability closed loop wiring method of medium voltage distribution network

Abstract

The invention relates to a high-reliability closed loop wiring method of a medium voltage distribution network. The method is characterized by comprising the following steps: S01, two independent buses are led out from the 10kv side of each transformer of a transformer substation; S02, the two buses are connected respectively through one looped network unit to form a closed-loop looped network structure, wherein each looped network unit is at least provided with a breaker to be used as an interconnection switch, and the closed-loop looped network structure formed by each transformer can be connected to the closed-loop looped network structure formed by the other transformer through the interconnection switches and an interconnection line; when each transformer normally runs, the breakers at the two ends of the interconnection line are both opened, the interconnection line is in the standby state, and the power supply load of each looped network does not exceed 40% of the power supply load of the thermal stability limits of two feedback lines. The method has the advantages that the power supply reliability is high, and the closed-loop operation of the same transformer can not increase the short-circuit current of a distribution network, so that the transformation amount is small, the construction cost is low, and the feasibility is high.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a high-reliability closed-loop wiring method for a medium-voltage distribution network. Background technique [0002] The medium-voltage distribution network in high-reliability power supply areas at home and abroad generally adopts a ring network structure, and its operation mode is divided into two types: open-loop operation and closed-loop operation. my country's medium-voltage 10 kV distribution network adopts the "open-loop operation + distribution automation" method, that is, the contact switch between each 10 kV feeder is opened during normal operation, and the 10 kV feeder uses radiation power supply; when the feeder fails, Fault location and isolation are implemented through the distribution automation system, and the contact switch is closed to realize power supply to the non-fault segment. The disadvantage is that it takes a long time to restore power supply after ...

AI Technical Summary

Problems solved by technology

If this wiring mode is directly applied to my country's 10 kV distribution network, the short-circuit current of my country's 10 kV distribution network will greatly exceed the rated value of existing equipment (generally 25 kA or 31.5 kA) , a large amount of transformation is required, which not only requires a large investment, but also may affect the normal power supply of users during the transformation

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