Method for isolating in-station faults of comprehensive power distribution terminal of transformer substation

Abstract

The invention discloses a method for isolating in-station faults of a comprehensive power distribution terminal of a transformer substation, and comprises the following steps of (1) acquiring an in-station voltage and current signal by utilizing a voltage and current acquisition module; (2) establishing an incidence relation between a locking signal detection module of an interconnection wire inlet switch and a locking signal control detection module of an interconnection wire outlet switch; (3) when a fault occurs, enabling a control module to detect all fault current signals from the power source point to the fault point; (4) enabling a locking signal module close to the fault point of the interconnection wire outlet switch to give out a locking out signal; (5) enabling the locking signal detection module of the interconnection wire inlet switch to lock an outlet of the wire inlet switch and performing protecting without motion; and (6) enabling the control outlet module of the interconnection wire outlet switch to protect the action outlet, wherein the fault is isolated. According to the method, fault isolation and power supply can be performed in place, the communication dependence degree is low, and the structure is simple.

Description

Technical field: [0001] The invention relates to a method for fault isolation in a station, in particular to a method for fault isolation in a station integrated power distribution terminal, which belongs to the field of feeder automation. Background technique: [0002] With the rapid development of the market economy and the continuous improvement of people's living standards, people's dependence on electric energy demand is increasing, especially the high-rise buildings in the city and users belonging to the first and second power supply standards are gradually expanding. , urban functions are becoming more and more perfect and complex. In the construction of 10kV distribution network in large and medium-sized cities, most of the power departments adopt the primary distribution structure of multi-power supply ring network power supply. This distribution structure has high power supply reliability. , the operation is relatively flexible, but there are many cascaded switches...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the market economy and the continuous improvement of people's living standards, people's dependence on electric energy demand is increasing, especially the high-rise buildings in the city and users belonging to the first and second power supply standards are gradually expanding. , urban functions are becoming more and more perfect and complex. In the construction of 10kV distribution network in large and medium-sized cities, most of the power departments adopt the primary distribution structure of multi-power supply ring network power supply. This distribution structure has high power supply reliability. , the operation is relatively flexible, but there are many cascaded switches, and the protection classification cannot widen the time difference. Therefore, the power distribution structure cannot realize the feeder automation function only by relay protection. It needs to cooperate with a suitable power distribution automation system to realize power supply. The continuity and reliability of the current distribution automation system, although it can complete the fault handling of the ring network line, must rely on communication and distribution master stations or sub-stations. The system is huge and difficult to install and maintain. Replication and promotion have relatively high requirements for operation and maintenance personnel

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