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