Converter transformer tap switch condition monitoring system and non-stationary signal spectrum estimation method

Abstract

The invention discloses a converter transformer tap switch condition monitoring system and a non-stationary signal spectrum estimation method. The system comprises a vibration signal sensor which is disposed on a housing of a transformer and is used for monitoring the operation process of a converter transformer tap switch; a digital filter for filtering noise waves; and a vibration data collection function module which is used for eliminating various types of signal noises. The method employs a maximum entropy-spectrum method, carries out solving of data outside a known limited data autocorrelation array through employing an extrapolation method under the condition of the maximum information entropy, and estimates the power spectrum density of a to-be-detected signal. The method achieves the estimation of the tap switch under the non-intruding detection, achieves the system inspection of the converter transformer tap switch, can reduce the incidence rate of faults in two preset correction periods, and employs the modern spectrum estimation method of maximum entropy estimation for the spectrum estimation of a non-stationary signal of an isolation switch, so as to further improve the analysis precision and accuracy.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a state monitoring system of a tap changer of a converter transformer and a method for estimating a frequency spectrum of a non-stationary signal. Background technique [0002] With the rapid development of the power industry, the capacity of power equipment and the scale of the power network are also increasing, which poses higher requirements and unprecedented challenges to the quality of power supply. Therefore, effective measures must be taken to improve the power supply quality of the power system and ensure the safe, reliable, economical and stable operation of power equipment and systems. The condition-based maintenance strategy based on online monitoring and fault diagnosis technology has a good application prospect and is the main development trend in the future. In the DC transmission project, the converter transformer is the core equipm...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a converter transformer tap-changer state monitoring system and non-stationary signal spectrum estimation method, aiming to solve the problem that converter transformer tap-changers are usually overhauled according to the system plan, and systematic maintenance cannot prevent two corrections problems during

Images