Fault full-sensing terminal and small-current single-phase grounding accurate positioning method thereof

Abstract

The invention provides a fault full-sensing terminal and a small-current single-phase grounding accurate positioning method thereof, and the terminal is characterized in that the terminal comprises anelectronic voltage transformer, an electronic current transformer, a protection line loss board, and a mainboard; the electronic voltage transformer is used for collecting A-phase voltage, B-phase voltage and C-phase voltage of the ring main unit. The electronic current transformer is used for collecting A-phase current, B-phase current and C-phase current of each interval of the ring main unit.The electronic voltage transformer and the electronic current transformer are respectively connected with the mainboard through the protection line loss board. An integrator and a filter are integrated in the electronic voltage and current transformer, and the electronic voltage and current transformer is a resistance-capacitance type transformer. The protection line loss board is used for carrying out analog-to-digital conversion on voltage and current signals. Real-time depiction of the operation state of the cable is achieved through acquisition of various signals, early warning is performed in advance to eliminate fault equipment, and accurate positioning of various faults can be achieved in a short time during fault.

Description

technical field [0001] The invention belongs to the technical field of distribution network operation and maintenance, and in particular relates to a fault full-sensing terminal and a small-current single-phase grounding precision positioning method thereof. Background technique [0002] In the electric power industry, the existing DTU lacks the ability to diagnose small current ground faults, and does not describe the hidden dangers of old cables. Especially in the scenario where the cable conversion rate is high and the proportion of cable faults is relatively high, the 10kV distribution network system adopts the arc suppression coil grounding method, and the actual operation and maintenance process has the following difficult problems: [0003] 1. It is difficult to troubleshoot cable faults. The cable is buried underground and cannot be directly observed. In addition, there is a lack of ground fault research and judgment methods. The fault location of the cable network ...

AI Technical Summary

Problems solved by technology

[0003] 1. It is difficult to troubleshoot cable fault points

The cable is buried underground and cannot be directly observed. In addition, there is a lack of ground fault research and judgment methods. The fault location of the cable network is not accurate, which makes it difficult to find the fault point of the cable. Requirements for Improving the Quality of Power Supply Services

[0004] 2. The distribution network is prone to secondary failures

[0006] After analyzing the waveform characteristics, it is found that there are only 9 waveforms that can actually be used for research and judgment, and the remaining 120 waveforms (accounting for 93.02%) have serious clutter, no zero-sequence current, no zero-sequence voltage, and unbalanced phase current. phenomenon is the main cause of misjudgment

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