PROTECH-203 超速保护器

Description

PROTECH-203 超速保护器

应用
ProTech 203 超速保护器通过监控三个独立的转速传感器来防止蒸汽轮机、燃汽轮机或 原 动 机 超 速 。 此 超 速 保 护 器 取 代 了 机 械 式 的 超 速 保 护 装 置 ， 特 别 是 在 高 速（>10000rpm）的应用中机械式的超速保护装置变的不再可靠的条件下。

优点
易于校准测试，精度和重复性高是此超速保护器的显著特点。ProTech 203 不需要像机械式超速保护装置那样，对于超速停机速度值要给予足够的余量。ProTech 203 采用的是数字式速度感应技术，通过面板操作即可简单的设定停机速度限值。为了确保功能的正常和保持良好的精度，三个单元中的任意一个单元都可在轮机运转时通过频率发生器进行测试。钥匙开关的设置确保了未经授权人员的编程和测试的权限。

三个数字单元感应和显示速度的精度为 0.1%，机械式超速保护装置的精度远远达不到此种水平。

ProTech 采用的是三选二停机方式，确保了不会因三个单元中的一个发生瞬时故障造成误停机。每个单元与其他两个单元除继电器的连接外，是完全隔离的。

为了进一步的防止误停机发生，每个速度感应单元所使用的电源也是独立的。

ProTech 不涉及到由于轮机旋转造成的机械磨损、磁化温度和运转温度等因素的影响。因为不涉及到机械旋转部分的磨损等问题，ProTech 可以长时间的保持停机速度设定值不变。

当 发 生 超 速 停 机 时 ProTech 可 记 录 显 示 轮 机 所 达 到 的 峰 值 转 速 。

PROTECH-203

PROTECH-203 超速保护器

Apply
The ProTech 203 overspeed protector protects steam turbines, gas turbines or engines from overspeed by monitoring three independent speed sensors. The overspeed protector replaces the mechanical overspeed protector, especially in high speed (>10000rpm) applications where the mechanical overspeed protector is no longer reliable.

advantage
Easy calibration testing, high accuracy and repeatability are notable features of this overspeed protector. ProTech 203 does not need to give sufficient allowance for overspeed stop speed values as mechanical overspeed protection devices do. The ProTech 203 uses digital speed sensing technology to easily set shutdown speed limits through panel operation. In order to ensure normal function and maintain good accuracy, any of the three units can be tested by a frequency generator while the turbine is in operation. The setting of the key switch ensures the permission of unauthorized persons to program and test.

The accuracy of the three digital units sensing and displaying speed is 0.1%, and the accuracy of the mechanical overspeed protection device is far from this level.

ProTech adopts a two-out-of-three shutdown mode to ensure that there will be no accidental shutdown caused by an instantaneous failure of one of the three units. Each unit is completely isolated from the other two units except for the connection of the relay.

In order to further prevent the occurrence of false shutdown, the power supply used by each speed sensing unit is also independent.

ProTech does not involve the influence of factors such as mechanical wear, magnetization temperature and operating temperature caused by turbine rotation. Because it does not involve the wear and tear of the mechanical rotation part, ProTech can keep the stop speed set value unchanged for a long time.

When an overspeed stop occurs, ProTech can record the peak speed reached by the display wheel.