Triangular pulse source circuit for positioning distribution transformer low-voltage side pulse injection fault

Abstract

The invention relates to a triangular pulse source circuit for distribution transformer low-voltage side pulse injection fault positioning, and belongs to the technical field of electric power. According to the invention, full-bridge rectification is used to rectify power frequency commercial power, and two capacitors are connected in parallel for filtering to obtain a direct current signal. A 555timing module is used for switching on and switching off MOSFET to a direct current signal, so that two capacitors discharge to the integrating circuit in front of and behind the integrating circuitrespectively, and voltages at two ends R of the integrating circuit are amplified by the pulse transformer and then triangular wave pulses are output. The triangular wave rising time is long, the sampling rate needed when the sensor is used for recording signals is low, and distortion is not likely to be caused. The signals have a peak value, and the peak value can be easily identified as a characteristic point. Compared with other injection waveforms, the invention has irreplaceable advantages, but an existing pulse source uses few triangular pulses. A high-voltage pulse source circuit is simple in structure and can be applied to a low-voltage side pulse injection signal source.

Description

technical field [0001] The invention relates to a triangular pulse source circuit used for pulse injection fault location at the low-voltage side of a distribution transformer, and belongs to the technical field of electric power systems. Background technique [0002] In the power system, due to the influence of the external environment and the failure of internal equipment, the ground fault often occurs in the power system. The C-type traveling wave method proposed to eliminate ground faults is to inject pulse signals into the power system in an off-line state, and calculate the fault distance by identifying the reflected wave at the fault point. [0003] However, the injected pulse signal is often a square wave pulse with sharp rising edges. The rapid change of the signal causes a large impact when encountering a distribution transformer or an inductive load during transmission. May cause damage to components in the power system. At the same time, the rise time of the s...

AI Technical Summary

Problems solved by technology

May cause damage to components in the power system

At the same time, the rise time of the square wave pulse is short, and the sampling rate is high when using the sensor to record the signal, and the low sampling rate will easily cause distortion

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