IS200BPVCG1B工控备件模块
该反馈用于校正假设的热模型。由于RTD具有相对缓慢的响应，RTD偏置对于缓慢的电机加热非常有用。当电机加热相对较快时，在启动和重过载条件下需要热模型的其他部分。对于低于RTD BIAS MINIMUM（RTD偏置最小值）设置的RTD温度，不会发生偏置。对于高于RTD BIAS maximum设置的最大定子RTD温度，热存储器完全偏置并强制为100%。在这两个值之间，如果所使用的RTD偏置热容量高于热模型其他特征所使用的热容量，则从该点开始使用该值。电机启动监控电机启动监控包括以下功能：启动间隔时间、每小时启动次数、重启时间。这些元件旨在保护电机免受过度启动负荷的影响，这通常由电机制造商除热损坏曲线外定义。机械堵塞和加速时间这两个元件用于防止在异常操作条件下（如加速时间过长或转子失速）损坏电机。相位差动保护此功能旨在保护大型电机的定子绕组和供电电缆。支持两种类型的电流互感器连接：•6个CT外部连接在求和配置中。•3个流量平衡CT。为电机启动和运行条件提供单独的跳闸拾取水平和时间延迟。短路跳闸此功能旨在保护电机定子绕组免受相间故障的影响。469配备了一个过流滤波器，在故障发生或电机启动时，从不对称电流中去除直流分量。跳闸备份功能也是该功能的一部分，用于在给定时间延迟内未清除故障时发出第二次跳闸。使用的RTD热容量（%）RTD偏置最大RTD偏置最小RTD偏置中心点
This feedback acts to correct the assumed thermal model. Since RTDs have a relatively slow response, RTD biasing is useful for slow motor heating. Other portions of the thermal model are required during starting and heavy overload conditions when motor heating is relatively fast. For RTD temperatures below the RTD BIAS MINIMUM setting, no biasing occurs. For maximum stator RTD temperatures above the RTD BIAS MAXIMUM setting, the thermal memory is fully biased and forced to 100%. At values in between, if the RTD bias thermal capacity used is higher compared to the thermal capacity used created by other features of the thermal model, then this value is used from that point onward. Motor Start Supervision Motor Start Supervision consists of the following features: Time-Between-Starts, Start-per-Hour, Restart Time. These elements are intended to guard the motor against excessive starting duty, which is normally defined by the motor manufacturer in addition to the thermal damage curves. Mechanical Jam and Acceleration Time These two elements are used to prevent motor damage during abnormal operational conditions such as excessively long acceleration times or stalled rotor. Phase Differential Protection This function is intended to protect the stator windings and supply power cables of large motors. Two types of current transformers connections are supported: • 6 CT’s externally connected in the summing configuration. • 3 Flux Balancing CT’s. Separate trip pickup levels and time delays are provided for motor starting and running conditions. Short Circuit Trip This function is intended to protect the stator windings of the motors against phase-to-phase faults. Equipped with an overreach filter, the 469 removes the DC component from the asymmetrical current present at the moment a fault occurs or motor starts. A trip backup feature is also available as part of this function, used to issue a second trip if the fault is not cleared within a given time delay. RTD Thermal Capacity Used (%) RTD Bias Maximum RTD Bias Minimum RTD Bias Center Point
