High-reliability self-energy-obtaining circuit based on energy-obtaining current transformer with iron core

Abstract

The invention belongs to the field of power system automation, and provides a high-reliability self-energy-obtaining circuit based on an energy-obtaining current transformer with an iron core. The high-reliability self-energy-obtaining circuit comprises a specially-made energy-obtaining CT, a rectifying circuit unit, a short-circuit current bypass and energy-obtaining balance regulation circuit unit, an energy storage circuit unit, an overvoltage protection and energy-obtaining balance control circuit unit, a self-energy-obtaining circuit self-starting and storage battery control circuit unit,a DC / DC module power supply and the like. The overvoltage protection and energy-obtaining balance control circuit unit is configured to couple a primary system with a strong interference bypass at asecondary side when the system generates short-circuit faults or is stroke by lightening to prevent the energy-obtaining CT iron core from saturation; the energy-obtaining balance regulation circuit unit employs a dynamic energy-obtaining mode of supply change with demand to automatically regulate the self-obtaining power so as to achieve balance between supply and demand; and moreover, the self-energy-obtaining circuit self-starting and storage battery control circuit unit is configured to perform effectively power supply management.

Description

technical field [0001] The invention belongs to the field of power system automation, and more specifically relates to a high-reliability self-energy harvesting circuit based on an energy harvesting current transformer with an iron core. Background technique [0002] In order to monitor the operating status of the power system, thousands of monitoring terminals need to be installed. Among them, a large number of monitoring terminals need external power supply. However, there are also various application scenarios that require the monitoring terminal to acquire energy from the object under test to obtain working power. For example, the image monitoring device of the high-voltage transmission line and the automatic control terminal of the medium-voltage distribution line, etc., are far away from the low-voltage power supply, so it is better to solve the working power of the device on the spot. A good solution; another example is the UHV reactive power compensation capacitor ...

AI Technical Summary

Problems solved by technology

The characteristic of this power regulation method is that the energy harvesting device has a large volume, and it needs to monitor the magnitude of the primary current in real time and cooperate with the switching tube control circuit, and the control is relatively cumbersome.

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