A distributed converter transformer direct current bias detection system and a detection method thereof

Abstract

The invention discloses a distributed converter transformer direct current bias detection system and a detection method thereof. The detection system comprises a plurality of detection terminals. Each detection terminal comprises a sensor module, a data acquisition module, a central controller, a communication module, a clock module and a power supply module; the sensor module comprises a microphone, an acceleration sensor and a current transformer. The method comprises the steps of installing a detection terminal in advance, separately acquiring a noise sound pressure level of noise signals, a 1/3 times frequency spectrum, a speed amplitude of vibration signals and a neutral point current effective value in two operation modes which are a normal operation mode of a converter transformer and a single-pole ground-loop debugging operation mode, comparing differences between acquired data in the two operation modes and diagnosing whether the converter transformer belongs to a direct current bias treatment scope according to the difference. The distributed converter transformer direct current bias detection system and the detection method thereof of the invention can overcome problems of a broad distribution scope and a large quantity of transformer stations, do not need excessive manpower and equipment resources, and have advantages of a flexible mode and relatively low cost.

Description

technical field [0001] The invention relates to a DC bias detection technology of a power transformer, in particular to a distributed converter transformer DC bias detection system and a detection method thereof. Background technique [0002] EHV / UHV DC transmission has the advantages of low power loss and long transmission distance, and is an important means to solve the imbalance between energy distribution and economic development in my country. With the commissioning of large-capacity, long-distance DC transmission lines, when the DC transmission system operates in the earth loop mode, there is a potential difference between the ground grids of the AC substation near the converter station. At this time, part of the current in the ground pole of the converter station will flow into the transformer through the neutral point of the transformer, causing the excitation current to be distorted and generate a large number of harmonics, resulting in half-wave saturation of the t...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the above-mentioned problems of the prior art, provide a distribution system that can overcome the problems of wide distribution and large number of substations, does not require too much manpower and equipment resources, and has flexible test methods and low cost. DC Bias Detection System and Method for Type Converter Transformer

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