Fault PhenomenonOn June 23, 2020, a fault occurred in the 35 kV feeder bay that was on hot standby at a 220 kV substation. This triggered the operation of the first - stage, first - time - limit voltage - restrained overcurrent protection of the low - voltage backup protection of the No. 2 main transformer and the second - stage overcurrent protection of the 350 bus tie protection. Consequently, the 352 circuit breaker on the low - voltage side corresponding to the No. 2 main transformer and the

Reasons for Over - load Operation of Distribution TransformersUnreasonable Monitoring MethodDuring the operation of a transformer, to ensure its safe operation, the load of the transformer is monitored. Currently, round - the - clock monitoring is mostly adopted to obtain the average load of the distribution transformer. However, due to the different demands for electrical appliances at different times, as well as the different power and quantity of equipment in operation in enterprises at diffe

IntroductionIn the complex landscape of power distribution, distribution transformers play a pivotal role. These transformers are tasked with stepping down voltage from the primary distribution levels to the appropriate utilization voltages for end-users. Their proper functioning is crucial for maintaining a stable and efficient power grid. This article delves into two essential aspects of distribution transformer assessment: thermal performance testing and mechanical performance testing, while