Novel outdoor embedded processor-based distribution automation data terminal with time scale

Abstract

The invention relates to a novel outdoor embedded processor-based distribution automation data terminal with a time scale. The terminal comprises a CT/PT module, a switching value isolation module, a GPS (Global Position System) time tick module, a GPRS (General Packet Radio Service) communication module, a central processing unit and a power module. According to the novel outdoor embedded processor technology-based distribution automation data terminal with the time scale, the characteristic quantity caused during a fault can be detected; when grounding is performed, transient state data are acquired and stored, and the data and a data acquiring module in a transformer substation are synchronized by the GPS time tick module, and a diagnosis and section positioning on a ground fault of a distribution system by matching data acquisition and data analysis in the transformer substation are realized. Acquisition of the transient state data with the time scale at an outlet terminal in a distribution network and data transmission are realized, the ground fault detection sensitivity is greatly improved.

Description

technical field [0001] The invention relates to a new type of distribution automation data terminal, in particular to a new type of outdoor distribution automation data terminal with time scale based on an embedded processor for ground fault location of a distribution network. Background technique [0002] my country's 10kV power grid belongs to the small current grounding system (that is, the neutral point is not effectively grounded system). When a single-phase ground fault occurs, although the regulations allow 2 hours of faulty operation, it may still cause accidents due to overvoltage damage to insulation. The fault statistics of the power supply and distribution system show that the probability of single-phase ground faults accounts for more than 66%. In the current field operation, especially after the arc suppression coil is widely used, the characteristics of the usual small current ground faults are not obvious, resulting in ground fault line selection, It is diffi...

AI Technical Summary

Problems solved by technology

The fault statistics of the power supply and distribution system show that the probability of single-phase ground faults accounts for more than 66%. In the current field operation, especially after the arc suppression coil is widely used, the characteristics of the usual small current ground faults are not obvious, resulting in ground fault line selection, It is difficult to realize the positioning device; especially the distance measurement and positioning technology of the grounding point is difficult to implement. The existing fault indicator has poor action accuracy after the grounding occurs, and the maintenance workload is heavy; Huge and slow to promote; at present, most of them return to the method of manual line inspection of each branch of the fault line in sequence, which takes a long time, manpower and material resources to determine the location of the grounding point.

This approach first greatly delays the investigation time of the ground fault and the recovery time of power supply, increases the induction of serious short-circuit faults and PT explosion faults, and threatens the safe and stable operation of the distribution network; Due to the step voltage and contact voltage around the grounding point, the possibility of electric shock for nearby personnel, including ground fault investigation staff and farming livestock, is greatly increased, threatening people's lives and property safety, and having a greater social impact

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