Electricity utilization protection method and electricity utilization protection device based on comprehensive integration of public transformers

Abstract

The invention discloses an electricity utilization protection method based on comprehensive integration of public transformers. The method comprises the following steps: a voltage transformer and a current transformer are connected in parallel to a low-voltage wire outlet end of a public transformer to acquire voltage and current information of the low-voltage wire outlet end of the public transformer in real time and obtain real-time voltage and current data; data operation processing is performed on the real-time voltage and current data to obtain the real-time relevant electric quantity value of a power supply line; the relevant electric quantity value is compared with a corresponding preset electric quantity value to judge whether the relevant electric quantity value meets the conditions of electricity utilization protection; and when the relevant electric quantity value meets the conditions of electricity utilization protection, electricity utilization protection is executed, wherein electricity utilization protection includes short-circuit protection, zero-sequence over-current protection, overvoltage protection, under-voltage protection, zero line breaking protection, phase lack protection, single-phase high-impedance grounding protection and / or three-phase power balance protection. The invention further discloses an electricity utilization protection device. By adopting the electricity utilization protection method and the electricity utilization protection device of the invention, power supply lines can be comprehensively and effectively protected, and the safety and reliability of electricity utilization can be improved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a fully integrated power protection method and protection device for public transformers. Background technique [0002] With the acceleration of my country's economic development, electricity has become an important infrastructure for the development of various fields. The construction and reform of urban and rural power grids implemented by my country's electric power industry for many years have achieved remarkable results, greatly improving the quality of power supply, strengthening the grid structure, and forming a safe, reliable and large-coverage power distribution network. However, with the wide application of power electronic technology in electric power and the access of various new power loads, a large number of nonlinear, impact, and fluctuating loads have been added to the power supply system, which has reduced the safety of power supply equipment and weakened the Relia...

AI Technical Summary

Problems solved by technology

However, with the wide application of power electronic technology in electric power and the access of various new power loads, a large number of nonlinear, impact, and fluctuating loads have been added to the power supply system, which has reduced the safety of power supply equipment and weakened the Reliability and economy of grid operation

Due to cost and technical problems in the traditional distribution network, the public transformer user outlets are only equipped with simple short-circuit protection. In the face of problems such as line overload, single-phase high-impedance grounding, line phase loss, and line zero line open circuit, it is no longer able to fully and effectively protect users. Outgoing electrical reliability

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