Method for carrying out online monitoring on operating state of transformer OLTC (on-load tap-changer)

A technology of on-load tapping and running status, which is applied in the testing of machines/structural components, testing of mechanical components, vibration measurement in solids, etc. It can solve the problems of low measurement accuracy, low efficiency, and inability to adapt to form requirements, etc.

Active Publication Date: 2013-04-17
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage is that the workload is large, the efficiency is low and the measurement accuracy is not high, and it has gradually failed to meet the formal requirements.

Method used

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  • Method for carrying out online monitoring on operating state of transformer OLTC (on-load tap-changer)
  • Method for carrying out online monitoring on operating state of transformer OLTC (on-load tap-changer)
  • Method for carrying out online monitoring on operating state of transformer OLTC (on-load tap-changer)

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings.

[0056] Taking the M-type on-load tap-changer of a 35kV transformer in a certain substation of a power company as the test object to conduct online monitoring, follow the steps below to judge the working status of the transformer’s on-load tap-changer:

[0057](1) Set the vibration sensor on the surface of the transformer on-load tap-changer, and collect the vibration signal of the transformer box wall in real time. The measured vibration signal when the on-load tap-changer operates is as follows: figure 1 shown;

[0058] (2) Perform anti-aliasing digital filtering and caching on the collected vibration signals, and then transmit them to the data analysis module through the high-speed bus;

[0059] (3) Use the delayed coordinate method to reconstruct the phase space of the vibration signal x(t), as

[0060] X ...

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Abstract

The invention relates to a method for carrying out online monitoring on an operating state of a transformer OLTC (on-load tap-changer) and belongs to the field of signal monitoring. The method comprises the following steps of: acquiring a mechanical vibrating signal of a box wall of a transformer in real time; carrying out phase space reconstruction on the vibrating signal x(t) by using a delay coordinate method; determining a designated area V of a reconstructed phase space; calculating density distribution of space phase points; calculating a correlation coefficient rho of a space density curve before and after the OLTC actuates; if the correlation coefficient rho is more than 0.8, judging that the operating state of the OLTC is normal; and if the correlation coefficient rho is less than 0.8, judging that the operating state of the OLTC is abnormal. By carrying out real-time monitoring on the vibrating signal in the actuating process of the OLTC, efficient and accurate judgment on the working state of the transformer OLTC can be implemented. The method can be widely used for the field of online monitoring and fault diagnosis of various transformer OLTCs.

Description

technical field [0001] The invention relates to the field of signal monitoring, in particular to an online monitoring method for the working state of a transformer on-load tap changer. Background technique [0002] The on-load tap changer is one of the most important and key equipment in the power system. It mainly realizes the effective operation of the power transformer through the step-by-step action of the on-load tap changer (OLTC: On-load Tap Changer). Therefore, the on-load tap changer is one of the key core components of the power transformer. [0003] Relying on the accurate and timely switching action of the on-load tap-changer, it can not only reduce and avoid large fluctuations in voltage, but also force the distribution of load flow, excavate the reactive power and active power output of equipment, and increase the flexibility of power grid dispatching. [0004] With the improvement of power quality requirements, the average daily voltage adjustment times of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H1/00G01M13/00
Inventor 傅坚林嘉杨王丰华金之俭周翔
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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