变压器后备保护动作跳闸分析及处理

Analysis and Treatment of Transformer Backup Protection Action Trip

变压器过流等后备保护动作跳闸,主保护没有动作,一般应视为外部(差动保护范围以外)故障,即母线故障或线路保护越级跳闸。变压器本体发生故障,由于过流等后备保护动作跳闸的概率很小。由于变压器在变电站中起着举足轻重的作用,变压器过流等后备保护跳闸,需要正确判断故障范围和停电范围,必须熟知变压器后备保护的保护范围,动作时跳哪些断路器,以及发生故障后怎么尽快处理。

The backup protection action such as transformer overcurrent trips,the main protection does not operate,and should generally be regarded as an external(outside differential protection range) fault,that is,the bus fault or the line protection overstepping tripping.When the transformer body fails,the probability of tripping by the backup protection action such as overcurrent is small.Since the transformer plays a decisive role in the substation,the backup protection tripping of the transformer overcurrent,etc.,to be able to correctly determine the fault range and power outage range,must be familiar with the protection range of the transformer backup protection,which circuit breakers are jumped during operation and how to deal with as soon as possible after the fault occurs.