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System for transitioning to the trip threshold for the start condition thermal model for a motor protection relay

机译:过渡到电动机保护继电器启动条件热模型的跳闸阈值的系统

摘要

A system used in a protective relay for motors for transitioning the value of the trip threshold to a motor start (stall) condition. The calculated transition trip threshold value follows I2t, specifically, the current to the motor. The transition trip threshold value includes a small fixed initial (offset) value, so that the increase in the trip threshold during transition to the actual start condition threshold value is always slightly ahead of the increase in the I2t value, preventing a trip until the input current exceeds the final trip threshold for the start condition.
机译:用于电动机保护继电器的系统,用于将跳闸阈值转换为电动机启动(失速)状态。计算得出的过渡跳闸阈值遵循I 2 t,具体来说就是流向电动机的电流。过渡跳闸阈值包括一个小的固定初始值(偏移量),因此在过渡到实际启动条件阈值期间,跳闸阈值的增加始终总是略微超过I 2 的增加t值,防止跳闸,直到输入电流超过启动条件的最终跳闸阈值为止。

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