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

A non-stationary signal and tap changer technology, applied in spectrum analysis, measuring devices, measuring electrical variables, etc., can solve problems such as failures that cannot be prevented

Inactive Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +2
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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 t...

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

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[0041] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0042] The structure and application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] Such as figure 1 As shown, the converter tap changer state monitoring system according to the embodiment of the present invention mainly includes: a vibration signal sensor 1 installed on the transformer housing to monitor the operation process of the converter tap changer;

[0044] Used to filter out clutter digital filter 2;

[0045] Vibration data acquisition function module 3 for eliminating various signal noises.

[0046] The vibration signal sensor for mon...

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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...

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Application Information

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IPC IPC(8): G01R31/327G01R23/167
Inventor 康真张超刘志远王瑞张玮崔海婷苏淼刘洋鲁聪马文长安婧刘先福马龙华王欢龙郭镭
Owner STATE GRID CORP OF CHINA
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