Patent ID: 11881700
Assignee: NR ENGINEERING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A method of longitudinal differential protection for detecting malfunction for a transformer using a longitudinal differential protection device coupled to the transformer, the method comprising:
determining, by a processor, a corrected parameter of a transformer according to a voltage and electrical parameters of the transformer, wherein the electrical parameters of the transformer comprise a rated capacity of the transformer, and the corrected parameter of the transformer comprises a capacity of the transformer;
determining, by the processor, a threshold value of a secondary-side operating parameter of a longitudinal differential protection device coupled to the transformer according to the corrected parameter;
acquiring, by the processor, a real-time secondary-side operating parameter of the longitudinal differential protection device; and
determining, by the processor, whether a malfunction has occurred to the transformer according to the real-time secondary-side operating parameter and the threshold value.