In-situ fault diagnosing technology for turn-to-turn short-circuit of transformer windings based on change in loss

A technology of transformer winding and inter-turn short circuit, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of long cycle, slow response, inability to locate and judge faults, etc., to achieve the effect of convenient project implementation and simple system structure

Inactive Publication Date: 2003-09-10
HOHAI UNIV
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Problems solved by technology

However, it is mainly used for qualitative analysis and has three obvious deficiencies: first, it cannot locate and judge faults; second, it responds slowly and has a long cycle;

Method used

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  • In-situ fault diagnosing technology for turn-to-turn short-circuit of transformer windings based on change in loss
  • In-situ fault diagnosing technology for turn-to-turn short-circuit of transformer windings based on change in loss

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Embodiment Construction

[0008] There are many forms of power transformers, but this diagnosis theory based on the trend of loss changes is the same. The following takes the Yd connection three-phase transformer fault diagnosis system as an example to illustrate the fault diagnosis technology of power transformer winding turn-to-turn short circuit based on the trend of loss changes.的实施方式。

[0009] Control attached Figure

[0010] The Yd-connected dual-winding three-phase transformer, high-precision sampling measures the current, voltage and transformer temperature (usually transformer oil temperature) on each side of each phase, a total of 13 quantities, namely

[0011]  AB  BC  CA  ab  bc  ca t

[0012] (To Y N , The three-phase transformer connected to d must also sample the neutral voltage and current).

[0013] Calculate the total power P of the original and secondary side of the transformer through these parameters 1 , P 2 , The difference is the total loss of the transformer ~P.

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Abstract

The present invention relates to in-situ fault diagnosing technology for turn-to-turn short circuit of transformer windings based on change in loss. The technological scheme includes sampling and measuring the voltage and currents of transformer in both sides, calculating the power in both sides, calculating the power difference in both sides or loss of the transformer, comparing with historical data of the transformer to determine whether to exhibit turn-to-turn short circuit fault and the fault degree. The present invention makes it possible to find the turn-to-turn short circuit fault early and accurately and determine the phase the fault is in while monitoring the current, voltage, active power, reactive power, power factor, etc.

Description

Technical field [0001] The invention relates to an on-line fault diagnosis technology for the inter-turn short circuit of a power transformer winding based on the loss change trend, and belongs to the technical field of electrical appliance reliability. Background technique [0002] The power transformer is the main equipment in the power transmission and transformation system and the core equipment of the power transmission and transformation station. The operating status of power transformers will directly affect the reliability of the entire power system. Although the operational reliability level of power transformers has improved in recent years, they are far from meeting the requirements of the power system, and power transformer failures occur from time to time. Statistics show that short-circuit between turns is one of the most common faults in power transformers. There are many reasons for short circuit between turns: for example, the process of manufacturing the coil is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06
Inventor 鞠平马宏忠丁晓群韩敬东李娟左英飞李邦云
Owner HOHAI UNIV
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