Rapid protection method for tap switch of converter transformer

Abstract

The invention discloses a rapid protection method for a tap switch of a converter transformer, and the method comprises the steps: collecting the voltage and current of each side of the converter transformer, and forming a rapid differential protection criterion of the converter transformer; relay signals of high oil temperature, on-load light gas, on-load gas, pressure release and the like of the converter transformer are collected to form non-electrical quantity anomaly detection criteria of the converter transformer; monitoring signals of oil temperature, body pressure, oil chromatography and the like at a tap switch of the converter transformer are collected to form abnormal criteria of the body monitoring signals of the converter transformer. And when the rapid differential protection criterion of the converter transformer is satisfied and the non-electrical quantity anomaly detection criterion or the body monitoring signal anomaly criterion is satisfied, performing protection action on the tap switch of the converter transformer. The method can sensitively and effectively identify the slight fault of the converter transformer tap switch and quickly act, thereby effectively protecting the converter transformer tap switch.

Description

technical field [0001] The invention relates to the protection design of a converter transformer in the field of direct current transmission in a power system, in particular to a protection method for a short-circuit fault of a tap changer of a converter transformer. Background technique [0002] In the DC transmission project of the modern power system, the converter transformer is widely used in the converter substation to realize voltage regulation in a large range and isolate DC, and is the main electrical equipment in the DC transmission project. Its cost is high, and the failure will lead to the interruption of DC transmission, which seriously threatens the safe and stable operation of the entire power system. The tap changer is the core component of the converter transformer to complete the voltage regulation; at the same time, it is also the most easily damaged fault-prone component of the converter transformer. [0003] In engineering, the converter transformer is ...

AI Technical Summary

Problems solved by technology

[0003] In engineering, the converter transformer is usually equipped with electrical quantity protection and non-electrical quantity protection, which can reflect various internal short-circuit faults and grounding faults of the converter transformer; however, it is sensitive to short-circuit faults at the tap-changer of the converter transformer. Deficiencies such as low sex and poor quickness

In recent years, there have been many short-circuit faults of converter transformer tap-changers. Due to the long operation time of the configured electric quantity protection and non-electric quantity protection, the converter transformer has been seriously damaged, and even exploded to cause more serious accidents.

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