Transformer winding wave process verification method based on self-excited oscillation wave

A transformer winding and self-excited oscillation technology, which is applied in the field of transformer equipment, can solve problems such as the inability to judge the accuracy of the winding wave process model, the accuracy of the model without inspection, and the poor insulation performance of the transformer winding structure.

Active Publication Date: 2018-09-04
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] This application provides a transformer winding wave process verification method based on self-excited oscillating waves to solve the problem that after the wave process model is established, there is no method to verify the accuracy of the model, and the winding wave process models established by many scientific research institutions and universities cannot be carried out. Accuracy judgment, the problem of poor insulation performance of the transformer winding structure designed with the winding wave process model

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  • Transformer winding wave process verification method based on self-excited oscillation wave
  • Transformer winding wave process verification method based on self-excited oscillation wave
  • Transformer winding wave process verification method based on self-excited oscillation wave

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Embodiment Construction

[0034] see figure 1 , the application provides a self-excited oscillation wave-based transformer winding wave process verification method including:

[0035] Step S1: Construct the self-excited oscillation waveform circuit of the transformer to be tested.

[0036] see figure 2 , the self-excited oscillation waveform loop of the transformer to be tested includes a three-phase transformer, a first DC high voltage generator, a first switch, a first waveform measuring device, a voltage dividing capacitor C2 and a stray capacitance to ground C0;

[0037] The three high-voltage windings of the three-phase transformer are connected end to end in sequence, and one end of the three low-voltage windings Lm of the three-phase transformer is connected to one point to form a neutral point;

[0038] The first DC high voltage generator is connected to the neutral point;

[0039] The neutral point is also grounded through the first switch;

[0040] The other ends of the three low-voltage...

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Abstract

The invention provides a transformer winding wave process verification method based on a self-excited oscillation wave. Through using an oscillation circuit formed by a transformer leakage reactance or excitation impedance and a stray capacitor among a capacitor sleeve, winding ground and winding turns, a direct current voltage is connected to and applied to the neutral point of a transformer starwinding, and then the neutral point is rapidly grounded so as to acquire a self-excited oscillation waveform. Through comparing the actual self-excited oscillation waveform of a transformer with a transformer winding wave model, the accuracy of the transformer winding wave model can be accurately determined.

Description

technical field [0001] The present application relates to the field of transformer equipment, in particular to a method for verifying the process of transformer winding waves based on self-excited oscillation waves. Background technique [0002] Under the action of immersion shock waves such as lightning impulse full wave and lightning impulse chopping wave, the initial potential distribution, potential gradient and impulse response characteristics of each line cake play an important role in transformer design and fault diagnosis. When the impulse voltage wave invades a certain winding of the transformer, a high induced voltage can appear on the other windings of the transformer, that is, the wave process between the transformer windings. Under certain conditions, the induced overvoltage between the transformer windings may exceed the insulation level of the low-voltage winding, causing insulation breakdown accidents; similarly, under certain conditions, when the shock wave ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 刘红文王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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