Self-powered super capacitor energy-storage power source for detecting line faults

Abstract

The invention discloses a self-powered super capacitor energy-storage power source for detecting line faults. The self-powered super capacitor energy-storage power source comprises a rectifying circuit, a pre-charging and by-pass switch circuit, a two-way controllable switch circuit, a charging and discharging control circuit, a super capacitor, an overvoltage control and driving circuit and a reference circuit. The rectifying circuit and the pre-charging and by-pass switch circuit are connected between a current transformer and a fault detecting device and are used for providing power output. The two-way controllable switch circuit is connected with the pre-charging and by-pass switch circuit and is used for controlling the super capacitor to be charged and discharged. The charging and discharging control circuit is connected with the two-way controllable switch circuit and is used for controlling the two-way controllable switch circuit to be connected and disconnected. The super capacitor is connected with the charging and discharging control circuit and the two-way controllable switch circuit and is used for energy storage. The overvoltage control and driving circuit is connected between the pre-charging and by-pass switch circuit and the reference circuit and is used for conducting overvoltage protecting control and driving. The input end of the reference circuit is connected to the pre-charging and by-pass switch circuit, and the output end of the reference circuit is connected with the charging and discharging control circuit and the overvoltage control and driving circuit. The self-powered super capacitor energy-storage power source can stably operate in line fault detection for a long time.

Description

technical field [0001] The invention belongs to the field of line fault detection, in particular to a self-powered supercapacitor energy storage power supply for line fault detection. Background technique [0002] At present, the DC power supply used in transmission line fault detection usually has the following methods: ①Directly use lithium battery pack or storage battery as the power supply of the line fault detection device; ②Use solar panels and batteries for power supply; Power is taken from the primary cable line, supplemented by battery or lithium battery energy storage to achieve uninterrupted power supply. However, these traditional methods have problems in applications requiring long life and high reliability. Method ① is purely powered by lithium batteries or batteries, which can reduce the size of the line fault detection device and be put into use quickly and conveniently. However, the service life of lithium batteries and batteries is short, and the performan...

AI Technical Summary

Problems solved by technology

[0003] However, the current of the high-voltage bus on the primary side of the current transformer is very small during normal operation. Even if there is a line fault that generates an instantaneous high current, the battery or lithium battery cannot obtain enough power due to the problem that the charging and discharging current of the battery and lithium battery cannot be too large. The energy will be in the state of discharge for a long time, and there are defects such as short service life, low power density, and discharge performance affected by temperature.

[0004] Therefore, for applications that require long life and high reliability, there are some limitations in using traditional power supply methods such as ①②③

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