Method for authenticating sympathetic inrush current in traction substation transformer
A technology for traction transformers and traction substations, which can be used in the measurement of current/voltage, instruments, electrical components, etc., and can solve and respond to problems such as low inrush current identification accuracy.
Inactive Publication Date: 2011-06-15
TSINGHUA UNIV
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Problems solved by technology
In view of the shortcomings of the existing methods described in the above technical background for the low identification accuracy of the inrush current, the present invention proposes a method for identifying the inrush current in the transformer of the traction substation
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The invention discloses a method for authenticating sympathetic inrush current in a traction substation transformer, which belongs to the technical field of relaying protection of main equipment of a power supply system. The method is used for authenticating the sympathetic inrush current in the traction transformer by using a theory that a time difference exists between a switch-on time of the traction transformer and an emerging time of differential current. The method is applicable to three-phase transformers in any forms, is high in authenticating speed and high in reliability, and cannotbe affected by harmonic waves.
Description
A method for identifying inrush currents in transformers in traction substations technical field The invention belongs to the technical field of relay protection for main equipment of a power supply system, and in particular relates to a method for identifying inrush currents in transformers of traction substations. Background technique The application of differential protection as the main protection of transformers in traction substations has many deficiencies in the protection of traction transformers. As the main protection of the traction transformer, its correct action rate has always been very low. When one traction transformer is running, and the insulation performance of the vacuum circuit breaker on the low-voltage side of the other traction transformer in standby is not good, it often happens that the standby transformer is switched on, resulting in excitation inrush current; at the same time, it will cause cascading and Should flow. The cascading and inrush c...
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IPC IPC(8): H02H7/045G01R19/165
Inventor 毕大强冯存亮
Owner TSINGHUA UNIV
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