Dynamic load harmonic wave monitoring method and device for power distribution transformer

Abstract

The invention relates to a dynamic load harmonic wave monitoring method and device for a power distribution transformer. The device comprises a data acquisition module, a filtration module, an analog-digital conversion module, a communication module, a kernel processing module and a display module. The kernel algorithm of the device is a systematic and comprehensive harmonic wave additional loss computing method proposed in the mode that an inverted-L-shaped transformer equivalent circuit model reduced to a secondary side and related theories such as the skin effect theory, the circuit superposition theory and the electrical measurement technology are combined, and the effects of all times of harmonic waves are equivalent to the individual effects of a series of independent power supplies and are merged. The system can be used for monitoring the harmonic conditions of a load of the power distribution transformer on line so that operators on duty, maintainers and administrative staff can control the harmonic conditions of the load of the power distribution transformer and conduct different types of adjustment or early warning according to the corresponding harmonic conditions.

Description

technical field [0001] The invention relates to the field of harmonic monitoring, in particular to a method and device for monitoring dynamic load harmonics of distribution transformers. Background technique [0002] The research and development of transformer harmonic monitoring is closely related to the development of distribution automation and started in the late 1980s. With the development of microelectronics technology and the advent of some new algorithms and integrated ICs, distribution automation monitoring terminals have also achieved greater development and breakthroughs. The FFT (Fast Fourier Transform) algorithm has improved the efficiency and accuracy of calculating grid harmonics. The monitoring function of power grid power quality is enhanced, and the regulation and control capability of the power system is improved. In recent years, with the rapid development of integrated circuits, it has the characteristics of high performance, low power consumption and h...

AI Technical Summary

Problems solved by technology

[0003] The additional loss caused by transformer harmonics is not a fixed value, but changes dynamically with the size of the load, and the distribution transformer of the same type has different harmonic additional losses due to different types and sizes of connected loads , the power harmonics caused by nonlinear loads in the power grid will aggravate the loss of distribution transformers, resulting in a huge waste of electric energy

The traditional off-line test method cannot fully reflect the additional loss state caused by the harmonics under the operating conditions of the transformer, so it cannot ensure the high efficiency of its work, and the waste of electric energy may still occur

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