What is Keyphasor in turbine?
What is Keyphasor in turbine?
Keyphasor is an electric pulse, or trigger, which is derived from a point on a rotating shaft, it serves as a zero phase reference for determining where imbalance is on a rotor. The keyphasor in turbo machines are necessary to find phase angle of unbalance mass at the time of dynamic balancing.
What is a Keyphasor module?
Keyphasor signal is a once-per-turn or multiple- event-per-turn pulse from a rotating shaft or gear used to provide a precise timing measurement. This allows 3500 monitor modules and external diagnostic equipment to measure shaft rotative speed and vector parameters such as 1X vibration amplitude and phase.
How do you test for Keyphasor?
Mount the keyphasor probe on the driver of the machine train. This will allow the driver to be run while uncoupled from the load. Mount one (1) Keyphasor probe per each machine speed. If a gear increaser or reducer is used, two (2) Keyphasor probes are recommended, one on each side of gear box.
What is Proximitor?
Proximity Transducer Systems provide an electrical signal that represents the distance between a conductive surface and the probe tip of the system. The Proximitor contains electronics that provide two functions: Generate a radio frequency (RF) signal using an oscillator circuit.
What is gap voltage in vibration?
Gap voltage (VDC) is a direct representation of distance between the probe’s tip and the shaft’s surface. This is the quiescent voltage that needs to be adjusted between the proximitor’s output voltage range limits. Any vibration of the shaft will cause the proximitor’s output voltage to vary in precise step.
How does a Proximitor work?
1. Proximity Sensors detect an object without touching it, and they therefore do not cause abrasion or damage to the object. Devices such as limit switches detect an object by contacting it, but Proximity Sensors are able to detect the presence of the object electrically, without having to touch it.
What is gap voltages in gas turbine?
The gap voltage is the base DC voltage set to get the AC pulses peak per the radial vibration measured on the shaft. The gap voltage is set at –8.00V DC i.e. equal to a gap of 40 mill (between the probe tip and the measuring surface).
How do you calculate voltage with spark gaps?
You can calculate the voltage needed for electricity to jump across a spark gap with a simple formula: voltage equals the air gap length in centimeters times 30,000.
How does proximity vibration probe work?
Proximity Probes are generated in the surface of the shaft. The Oscillator /Demodulator demodulates the signal and provides a modulated DC Voltage where the DC portion is directly proportional to gap (distance) and the AC portion is directly proportional to vibration.
What is the purpose of proximity?
What are gap voltages?
Gap voltage is the voltage in the gap between two electrodes. The total energy of the spark is determined by the applied voltage. Depending on the setting of the voltage, the IEG is set by the servo control.
What is vibration in turbine?
Steam turbines are efficient but complex machines, meaning that there are a number of possible ways they may malfunction. One such malfunction is known as vibration, which occurs as a result of impacts between stationary and rotating parts.
What is the purpose of spark gap?
Spark Gaps. Gas filled spark gaps are high energy, voltage controlled switching devices, unique in their ability to repeatedly switch currents of thousands of amperes. They are ideally suited for diverting large electrical surges caused by lighting, EMP and other sources of high voltage, high current transients.
What is vibration probe?
They are used for measuring fluctuating accelerations or speeds or for normal vibration measurement. Maintenance professionals use the sensors in order to predict the maintenance of the machinery, to reduce overall costs and increase the performance of the machinery.
What is proximity rule?
In social psychology, the proximity principle suggests that people closer together in a physical environment are more likely to form a relationship than those farther away.
What is the purpose of a spark gap?
Spark gaps are frequently used to prevent voltage surges from damaging equipment. Spark gaps are used in high-voltage switches, large power transformers, in power plants and electrical substations.
What can cause vibration in a gas turbine?
The primary cause of the mechanical breakdown of the gas turbine in the CCPPs is vibration. The main reasons for destructive vibration on the studied system are the shaft unbalancing, critical speed, rubbing, steam flow fluctuations, and shorted-turn.
How turbine vibration is measured?
Vibration is measured either in terms of displacement, velocity or acceleration. Vibration displacement is always measured as Peak to Peak, a measure of the total excursion of the rotor or machine casing in MILS or MICROMETERS. Vibration velocity and Acceleration are measured as Zero to Peak or RMS.
What is keyphasor in Turbo?
Keyphasor is an electric pulse, or trigger, which is derived from a point on a rotating shaft, it serves as a zero phase reference for determining where imbalance is on a rotor. The keyphasor in turbo machines are necessary to find phase angle of unbalance mass at the time of dynamic balancing.
What is keyphasor in vibration system?
Defining Keyphasor in vibration system. The Keyphasor is a transducer installed on machine traine, observing a once-per tum event on a rotating shaft providing a voltage pulse that occurs once per revolution of the shaft as shows in Fig. Fig . The keyphasor pulse provides a reference for data taken on a machine train.
What is keyphasor in steam turbine and what is its function?
What is keyphasor in a steam turbine and what is the function of it? Should I hire remote software developers from Turing.com? It is so hard to hire strong engineers for my company in San Francisco. The Keyphasor signal is a once-per-turn voltage pulse provided by a transducer (normally an eddy current proximity measurement system).
What is a keyphasor signal?
A transducer that produces a voltage pulse for each turn of the shaft, called the Keyphasor. This keyphasor signal is used primarily to measure rotating shaft speed and serves as a reference for measuring vibration phase lag angle.