Method for identifying inrush current and short circuit current in transformer differential protection
By constructing a phase difference ladder criterion for differential current, the inrush current and short-circuit current in the transformer are identified, solving the problem of false tripping or failure to trip in transformer differential protection and ensuring the normal operation of the transformer.
CN116960898BActive Publication Date: 2026-05-29YINCHUAN POWER SUPPLY COMPANY OF STATE GRID NINGXIA ELECTRIC POWER
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YINCHUAN POWER SUPPLY COMPANY OF STATE GRID NINGXIA ELECTRIC POWER
- Filing Date
- 2023-07-17
- Publication Date
- 2026-05-29
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Figure CN116960898B_ABST
Abstract
A method for identifying inrush current and short-circuit current in transformer differential protection, the method comprising: taking the phase difference of differential current when the transformer simultaneously occurs short-circuit fault during inrush current as the phase difference ladder criterion of differential current under different conditions, and identifying inrush current and short-circuit current in the transformer according to the phase difference ladder criterion. The scheme can construct the phase difference ladder criterion of differential current under different conditions according to the characteristics of inrush current and short-circuit current, and realize accurate identification and distinction of inrush current and short-circuit current, ensuring the correctness of the operation of transformer differential protection.
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Citation Information
Patent Citations
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