Transformer self-adaptive protector and protection method thereof

Abstract

The invention discloses a transformer self-adaptive protector and a protection method thereof. The protector comprises a quick-acting unit, a fault component unit, a zero-load switching-in unit and a parameter identification and threshold value setting unit, wherein the quick-acting unit protects criteria to set most serious external faults and can eliminate serious faults in a high speed; the fault component unit uses fault component information to improve the protection sensitivity and protects the correct identification of internal weak faults; the zero-load switching-in unit ensures the reliability and the sensitivity only when a transformer is subject to zero-load switching-in; and the identification parameter comprises the leakage inductance of a transformer winding, and the identification result is used for realizing the update of protection parameters and the on-line setting of threshold values, thereby ensuring the protection reliability and sensitivity. The transformer self-adaptive protection scheme based on the equivalent equation principle can meet the relay protection requirements for reliability, selectivity, sensitivity and quick action by the mutual matching of all the units.

Description

Technical field: The invention belongs to the field of power systems, and relates to a method for realizing a power system protection device, which is particularly suitable for a substation to carry out protection configuration and fault discrimination for transformers under its jurisdiction. Background technique: The power transformer is the key equipment in the power system, which plays the role of energy and voltage conversion in the whole power system. Therefore, whether the transformer can operate safely and stably directly affects the safety and stability of the entire power system. As the "first line of defense" of the power system, the relay protection device will play a vital role in it. Differential protection has always been the main protection of power transformers. It is based on Kirchhoff's current law and has the characteristics of simple principle, high sensitivity and good selectivity. However, the transformer is an electrical component that connects the w...

AI Technical Summary

Problems solved by technology

However, the common problem existing in transformer protection principles based on voltage and current information is the difficulty of threshold value setting. Therefore, how to construct a simple protection criterion and realize flexible and convenient threshold value setting based on transformer nameplate parameters or normal operating data is based on the new principle of voltage and current information. main problem to be solved

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