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Method for judging three-phase parameter inconsistent operation of large transformer bank

A technology for a transformer bank and a transformer is applied in the field of judging the inconsistent operation of three-phase parameters of a large-scale transformer bank, and can solve the problems of lack of operation, inconsistent parameters of a large-scale three-phase transformer bank, and an inconsistent operation judgment method of parameters of a large-scale three-phase transformer bank.

Active Publication Date: 2013-07-17
STATE GRID HUBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for judging the operation of inconsistent parameters of large-scale three-phase transformers, and solve the problem of lack of judgment conditions in the operation of inconsistent parameters of large-scale three-phase transformers

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  • Method for judging three-phase parameter inconsistent operation of large transformer bank
  • Method for judging three-phase parameter inconsistent operation of large transformer bank
  • Method for judging three-phase parameter inconsistent operation of large transformer bank

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Embodiment Construction

[0018] Judgment conditions for large-scale three-phase transformer group parameters inconsistent operation, first clarify the expression of negative-sequence three-phase unbalance degree of large-scale three-phase transformer group parameter inconsistent operation with respect to transformer group parameters (including transformation ratio, short-circuit impedance and capacity), and then use three The phase-negative sequence unbalance is the criterion for judging the inconsistent operation of large transformer parameters. The specific steps are:

[0019] (1) Negative-sequence three-phase unbalance degree expression of Y0 / Y0 connection mode transformer group operation

[0020] a) The formula for calculating the influence of different transformation ratios on the negative-sequence three-phase unbalance degree is expressed in formula (8):

[0021] ϵ I = | I 2 ...

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Abstract

The invention provides a method for judging three-phase parameter inconsistent operation of a large transformer bank. The limiting conditions in operation of the transformer bank serve as the judging criterions, unbalance conditions of relevant parameters of the transformer bank can be judged to confirm whether the transformer bank can operate under the condition that the three-phase parameters are inconsistent. The method can be used for fast and effectively judging single phase substitution and backup phase selection of the large transformer bank.

Description

technical field [0001] The invention relates to the field of power system operation analysis, in particular to a method for judging inconsistent operation of three-phase parameters of a large transformer group. Background technique [0002] As one of the most important main equipment in the power system, the large transformer group plays a vital role in ensuring the reliability of the grid power supply for its safe and stable operation. Ideally, the three-phase parameters of the transformer are considered to be the same, and the three-phase current should be symmetrical during normal operation; in fact, the three-phase parameters of the transformer are not exactly the same, which will produce unbalanced electrical components. However, the degree of inconsistency of the three-phase parameters of large transformers is generally small, and the unbalanced impact on the power grid can be ignored. Therefore, the current analysis of the operation of large transformers is mainly fo...

Claims

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Application Information

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IPC IPC(8): G01R29/16
Inventor 舒欣张侃君夏勇军周友斌陈磊王婷
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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