Main transformer protection method and system based on operation mode in hand-in-hand power supply mode

• Main Authors: WANG XIAOHONG, WANG YINGRUI, WU TONGHUA, FENG HONGWEI, AN LIN, DAI WEI, SHEN GUIPENG, WANG ZHONGLANG, LI GANG, WU DAN
• Format: Patent
• Language: Chinese; English
• Published: 18.06.2024
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a main transformer protection method and system based on an operation mode in a hand-in-hand power supply mode, and relates to the field of power system relay protection, and the method and system comprise the steps: automatically inputting a corresponding main transformer protection function according to the state of a main transformer circuit breaker; when the main transformer has a failure fault or a dead zone fault, the incoming circuit breaker is correctly and selectively tripped off according to the operation mode, and the fault is removed; and after the two faults occur and an incoming line circuit breaker is tripped, the spare power automatic switching function of the corresponding transformer substation is selectively locked by utilizing GOOSE signals according to the operation mode, and reclosing protection and incoming line closing can be correctly locked. The method has the advantages that the incoming line power supply can be correctly identified, the power supply can be in