An intelligent identification method for short-circuit fault voltage of 10kv line

Abstract

The invention provides an intelligent identification method of 10kV line short-circuit fault voltage. The method is characterized in that a double-CPU feeder terminal formed by a main CPU and a detecting CPU is built, the residual voltage or instantaneous voltage during a 10kV line short-circuit fault is fast identified through the feeder terminal, a locking condition is provided for feeder terminal fault isolation, intelligent diagnosing can be performed and corresponding fault information can be provided when a 10kV power supply voltage transformer outside the feeder terminal and a related detecting loop fail, and a user can be timely reminded to turn on or turn off complete equipment to guarantee that the equipment is in a good operation state. By the intelligent identification method good in social benefit, local feeder automatic fault isolation and power restoration success rate increasing are benefited.

Description

technical field [0001] The invention relates to a detection technology for a line short-circuit fault voltage in an on-site feeder automation in the field of intelligent distribution networks, in particular to an intelligent identification method for a 10kV line short-circuit fault voltage. Background technique [0002] At present, in the domestic on-site feeder automation field, the most widely used feeder automation technology adopts the on-site coincidence mode. The executive body to complete fault isolation and restore power supply is mainly composed of voltage-time feeder terminal (FTU) or similar products, electromagnetic The pole-mounted load switch and the power transformer on both sides will be referred to as "pole-mounted switch complete set" in the future, and the power transformer will be referred to as "PT" for short. [0003] In the prior art, the "feeder terminal" uses a secondary voltage transformer installed inside it, which converts the voltage signal outpu...

AI Technical Summary

Problems solved by technology

[0006] 1) The FTU cannot judge whether the 10kV power supply PT is faulty, and cannot give early warning in time, because the FTU collects the 10kV voltage signal through the EVT module. FTU cannot achieve fault isolation;

[0007] 2) The failure of the FTU's internal hardware detection circuit cannot be detected by the relay scheme. In this case, the FTU cannot achieve fault isolation;

[0008] 3) Due to the relatively tight internal space of the FTU, if the relay detection scheme is adopted, the hardware circuit is complicated, the debugging is complicated, and the installation space is tight, especially the internal space of the cover-type FTU is even more tight;

Images