Steam Turbine Generator Question

They are a Star Trek weapon that annihilates imbalances.

CR4 - Thread: Turbine Key Phaser Function

The key Phasor is an electronic method of using the computer to help find a point to start from when balancing a unit that is out of balance. In the old days we used a strobe light and found marks on the shaft that were put there during an outage to determine where to place the weights. Using the key phasor makes the job faster and easier to calculate a weight to help balance a rotor.

The X-Y probes give individual magnitudes of vibration data for those locations. The Key Phasers provide an angular or Phase reference for the X-Y probes data.

A key phaser is just another (larger range) displacement probe, like the X and Y probes, sensing a shaft key or keyway on a smaller machine. On a large machine, like a turbine/generator, I think shim stock is epoxied at the point you want to be zero degrees. Phase of X and Y displacements are then referenced to this zero.

Not rocket science, just a great name. RIP, Donald Bently.

http://en.wikipedia.org/wiki/Donald_E._Bently

On a turbine generator you cannot epoxy anything to the shaft if you want it to stay. You either drill or machine a spot on the shaft or drill and tap and bolt a key to the shaft to get a key phasor probe to work.