继电器.第149部分:热继电器功能要求

[中文适用范围]： IEC 60255 系列的这一部分规定了热保护继电器的最低要求。该标准包括保护功能、测量特性和测试方法的规范。该标准的目的是建立一个通用且可重复的参考，用于评估相关时间继电器，通过测量流过设备的交流电流来保护设备免受热损坏。补充输入激励量，例如环境@冷却剂@顶部油和绕组温度可适用于本标准中规定的热保护规范。该标准涵盖基于具有记忆功能的热模型的保护继电器。本标准还包括验证热保护功能和精度的性能特征的测试方法。本标准无意涵盖 IEC 60947-4-1 和 IEC 60947-4-2@ 中指示的与低压电机起动器机电和电子保护装置相关的热过载保护脱扣等级。 [外文原描述]： IEC 60255-149:2013 specifies minimum requirements for thermal protection relays. This standard includes specification of the protection function, measurement characteristics and test methodologies. The object is to establish a common and reproducible reference for evaluating dependent time relays which protect equipment from thermal damage by measuring a.c. current flowing through the equipment. Complementary input energizing quantities such as ambient, coolant, top oil and winding temperature may be applicable for the thermal protection specification set forth in this standard. This standard covers protection relays based on a thermal model with memory function.