仪表（TSI）是外壳扩展。外壳扩展
（有时称为壳体膨胀）是指
机壳在加工过程中膨胀时的增长
启动和在线操作。案例扩展
传感器系统通常安装在
连接涡轮机壳的另一端
并提供有关增长的信息
相对于基础的机壳。
大小写扩展是一个参数，您应该使用双
测量传感器布置。此安排
提供有关上滑动支脚位置的信息
机壳。阻碍或堵塞的状况
脚可能使外壳变形并损坏机器。这个
双壳体膨胀传感器配置
对于3300或3500监视器，会对此发出警报
条件高温双壳体膨胀
传感器配置仅与3500/45兼容
位置监视器。
外壳扩展测量还使您能够
确定机器状况是否超过
预期温度增长差异。这主要是
用于确定机器是否
外壳和转子的热增长率几乎相同。
不同的热增长率会导致旋转和
机器的固定部件需要摩擦。
壳体膨胀传感器组件由线性
可变差动变压器（LVDT），安装在
防风雨保护外壳。
An important position measurement in Turbine Supervisory Instrumentation (TSI) is case expansion. Case expansion (sometimes referred to as shell expansion) is the thermal growth of the machine case as it expands during machine startup and on-line operations. The case expansion transducer system is typically mounted on the foundation at the opposite end from where the turbine casing is attached to the foundation and provides information about the growth of the machine case relative to the foundation. Case expansion is a parameter that you should use a dual transducer arrangement to measure. This arrangement provides information about the position of the sliding feet on the machine case. A condition that obstructs or jams one foot could distort the case and damage the machine. The dual case expansion transducer configuration in conjunction with the 3300 or 3500 monitors provides an alarm for this condition. The high temperature dual case expansion transducer configuration is compatible only with the 3500/45 Position Monitor. Case expansion measurements also enable you to determine whether machine conditions are exceeding expected temperature growth differentials. This is primarily a startup parameter that determines whether the machine casing and rotor grow thermally at nearly the same rate. Different rates of thermal growth can cause the rotating and stationary parts of the machine to rub. The case expansion transducer assembly consists of a linear variable differential transformer (LVDT), which is housed in a weatherproof, protective enclosure.
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