Transformer turn-to-turn short-circuit fault location positioning method

A technology of inter-turn short-circuit fault and positioning method, which is applied in the field of transformers and can solve the problems that the location of inter-turn short-circuit fault cannot be accurately located

Inactive Publication Date: 2017-10-13
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for locating the fault location of the inter-turn short circuit of a transformer to solve the problem that the existing positioning method cannot accurately locate the fault location of the inter-turn short circuit

Method used

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  • Transformer turn-to-turn short-circuit fault location positioning method
  • Transformer turn-to-turn short-circuit fault location positioning method
  • Transformer turn-to-turn short-circuit fault location positioning method

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Embodiment Construction

[0028] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0029] Please refer to the attached figure 1 , with figure 1 A schematic flowchart of a method for locating a fault location of a transformer interturn short circuit provided by an embodiment of the present invention is shown.

[0030] The method for locating the transformer turn-to-turn short-circuit fault location provided by the embodiment of the present invention specifically includes:

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Abstract

The invention provides a transformer turn-to-turn short-circuit fault location positioning method. According to the method, a transformer model is established according to Infolycita software; secondary side windings are divided into winding sections in an equal-step length manner; the phase current of each winding section is measured, a short-circuit current-short circuit turn location curve is drawn, so that a change rule of short-circuit current changing with a transformer turn-to-turn short-circuit location is obtained; and when a transformer is short circuited, a turn-to-turn short-circuit location corresponding to measured short-circuit current is searched on the short-circuit current-short circuit turn location curve, so that the specific location of the turn-to-turn short-circuit fault of the transformer can be determined. According to the method, the establishment of the transformer model and the division of the secondary side windings consider a magnetic field and a circuit, and therefore, magnetic flux leakage can be avoided, the calculation accuracy of the phase current can be improved, and therefore, the drawing accuracy of the short-circuit current-short circuit turn location curve can be improved, and the specific location of the turn-to-turn short-circuit fault of the transformer can be determined accurately.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a method for locating the location of a short-circuit fault between turns of a transformer. Background technique [0002] Transformer is an important electrical equipment in power system. Using the principle of electromagnetic induction, the transformer can realize voltage transformation, current transformation and impedance transformation, and then play the role of isolation, voltage stabilization, power distribution and power transmission. Due to the isolation, voltage stabilization, power distribution and power transmission functions of the transformer, if the transformer fails, it will affect the normal operation of the power grid. Therefore, it is extremely important to ensure the safe operation of the transformer. [0003] Common faults in transformer operation include winding, bushing and tap changer faults, and winding fault is the most common fault. Transformer wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/62
Inventor 李胜男孟庆民
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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