Transformer winding turn-to-turn short circuit vibration acceleration calculating method

A technology of transformer winding and vibration acceleration, which is applied in calculation, instrument, complex mathematical operation, etc., can solve the problems of winding deformation, burning, affecting the safe and stable operation of equipment system, etc.

Active Publication Date: 2018-11-30
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

With traditional protection, it is difficult to identify the fault state of the winding when an inter-turn short circuit occurs in the transformer. If the transformer continues to operate under load, it will lead to serious consequences such as deformation or even burning of t

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  • Transformer winding turn-to-turn short circuit vibration acceleration calculating method
  • Transformer winding turn-to-turn short circuit vibration acceleration calculating method
  • Transformer winding turn-to-turn short circuit vibration acceleration calculating method

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Example Embodiment

[0053] Below in conjunction with accompanying drawing and specific embodiment, the calculation method of transformer winding turn-to-turn short-circuit vibration acceleration of the present invention is further described:

[0054] A method for calculating the vibration acceleration of a transformer winding turn-to-turn short-circuit vibration in this embodiment includes the following steps:

[0055] refer to figure 1 , a calculation method for the acceleration of short-circuit vibration between turns of a transformer winding, comprising the following steps:

[0056] 1) Magnetic field model

[0057] Aiming at the nonlinear problem of transformer excitation, the method of magnetic field simulation is used for analysis, without considering the hysteresis effect, the vector magnetic potential finite element method is used, and the transformer nonlinear magnetic field equation is obtained according to the Maxwell equation:

[0058]

[0059] In formula (1), μ is the magnetic pe...

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Abstract

The invention relates to a transformer winding turn-to-turn short circuit vibration acceleration calculating method. The method is characterized by including steps of magnetic model adopting, circuitmodel adopting and winding vibration acceleration calculating. Practical condition limitations in short-circuit test and electrodynamic force measurement are overcome, electromagnetic characteristicsin operation of a transformer are fully considered in calculation, and transformer winding faults are accurately simulated by taking transformer head end and middle turn-to-turn short circuit faults as calculating objects. A field-circuit coupling model is adopted for effectively simulating an internal magnetic field environment in transformer winding turn-to-turn short circuit, correctness of thefield-circuit coupling model is verified by comparison of simulation results and experimental data, and accordingly the feasible method is provided for winding turn-to-turn short circuit fault identification. The method has advantages of scientificity, reasonability, realness, effectiveness, high practical value and the like.

Description

technical field [0001] The invention is a calculation method of winding inter-turn short-circuit vibration acceleration based on a three-dimensional field-circuit coupling model of a transformer, which is applied to power transformer winding vibration acceleration analysis and winding inter-turn short-circuit fault identification. Background technique [0002] The power transformer is the heart of the power system and plays an irreplaceable role in the transmission of electric energy. Its stable operation is almost directly related to the reliability of the entire power system operation, and the transformer is prone to failure due to various reasons. Turn-to-turn short circuit of transformer winding is generally caused by short circuit of turns due to insulation damage, which has the characteristics of sudden change of fault phase short circuit current, severe electromotive force and vibration, and no obvious change of non-fault phase current. It is very difficult for tradit...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/13G06F17/14G06F17/15
CPCG06F17/13G06F17/14G06F17/15G06F30/23
Inventor 潘超米俭韩涛蔡国伟
Owner NORTHEAST DIANLI UNIVERSITY
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