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为避免高峰负荷时母联备自投动作可能造成变压器严重过载,提出一种计算变压器各侧开关电流之和的闭锁逻辑:开关电流之和大于备用变压器额定电流一定倍数时,对备自投装置实施闭锁。分析了此闭锁逻辑在110kV变电站不同变压器容量配置,不同一次接线方式等情况下的实际运用,针对CT变比不同的情况,提出了将采集电流在备自投逻辑中折算为一次电流进行相加或者引入CT变比调整系数两种解决方案,并对闭锁电流值的整定给出建议值。此闭锁逻辑对负荷进行了定量处理,且易于在各厂家、各型号备自投装置中实现,具有一定的实用价值。
In order to avoid the serious overload of the transformer during the peak load, a kind of logic to calculate the sum of the switching currents at the sides of the transformer is proposed. When the sum of the switching currents is larger than the rated current of the backup transformer, Implementation of the lock. This paper analyzes the practical application of this blocking logic in the case of different transformer capacity configuration and different primary connection modes in 110kV substation. According to the different CT transformation ratio, it is proposed to add the collected current to primary current Or the introduction of CT ratio adjustment coefficient of the two solutions, and the setting of the lock current value given recommendations. The logic of the closure of the load carried out a quantitative treatment, and easy in various manufacturers, all models of self-vote device to achieve, with some practical value.