Medium voltage distribution network two wire closed loop operation wire connecting method

Abstract

The invention discloses a medium voltage distribution network two wire closed loop operation wire connecting method comprising a first transformer substation and a second transformer substation. The medium voltage distribution network two wire closed loop operation wire connecting method is characterized in that the first transformer substation comprises a first main transformer and a second main transformer which are operated in parallel, a third main transformer and a fourth main transformer which are operated in parallel; the second transformer substation comprises a fifth main transformer, a sixth main transformer, and a seventh main transformer and an eighth main transformer which are operated in parallel; circuits from buses of two main transformer operated in parallel are connected with each other to form closed loop units. Transferring capacity between the closed loop units in the medium voltage distribution network can be flexibly configured according to power supplying reliability, flow distribution is simple and easy to be controlled, longitudinal differential protection is adopted in the medium voltage distribution network, so that N-1 is generated in the medium voltage distribution network and fault points can be rapidly separated to restore power supplement during the fault, and an equipped automatic system can be utilized to realize intelligentialization of switching operation, so that the switching operation can be utilized to restore power supplement during N-1-1 and N-2 faults; the medium voltage distribution network two wire closed loop operation wire connecting method is simple in structure and convenient to operate and implement.

Description

【Technical field】 [0001] The invention relates to a second-line closed-loop connection mode of a medium-voltage distribution network. 【Background technique】 [0002] In order to meet the user's increasingly high demand for power reliability, the medium-voltage distribution network has developed a large number of wiring methods, which can be roughly divided into open-loop operation mode and closed-loop operation mode according to different operation modes. The Singapore petal connection method and the ring connection method adopted by Hong Kong CLP Power Co., Ltd. are more mature in the application of the mode, but there are still some defects or deficiencies in the above ring connection method: [0003] The petal connection method in Singapore has the problem of limited transfer capacity between ring-closing units due to unbalanced power flow distribution; [0004] The loop-closing connection method adopted by Hong Kong CLP Power Co., Ltd. also has the problem of limited tr...

AI Technical Summary

Problems solved by technology

[0003] The petal connection method in Singapore has the problem of limited transfer capacity between ring-closing units due to unbalanced power flow distribution;

[0004] The loop-closing connection method adopted by Hong Kong CLP Power Co., Ltd. also has the problem of limited transfer capacity between loop-closing units, and also suffers from the problem of unbalanced power flow when the loop-closing unit "N-1" fails and operates normally. , resulting in a large difference between the actual load rate of the ring closing unit and the theoretical maximum load rate

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