- DC average
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The average of the DC component measurements during a sample period as calculated by ΣX/n, where X is the array of samples acquired and n is the number of samples.
- Flux Density Integral Zero Cross (FDZC)
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The FDZC is the point at which the integral of the flux waveform is zero volts, which affords the greatest sensitivity to detecting a shorted turn in a coil.
- flux
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Rate that an electric field flows through a given area, proportional to the number of electric field lines going through a virtual surface.
- flux density
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The amount of flux passing through a defined area that is perpendicular to the direction of the flux.
- Generator Field Monitoring System
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A Cutsforth product which monitors shaft voltages, shaft currents, and rotor flux signals and provides real-time data and analytics through Cutsforth's InsightCMTM software.
- ground conductor
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8 AWG, green ground conductor that carries the shaft current to the unit case ground location.
- ground current
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The electrical current between the shaft and the unit case ground through the ground conductor.
- ground rope
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The left rope in the Shaft Grounding Assembly, which provides the primary path to unit case ground through the 8AWG ground conductor.
- lag
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An alternating current that reaches its maximum value up to 90 degrees later than the voltage that produces it.
- lead
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An alternating current that reaches its maximum value up to 90 degrees ahead of voltage that produces it.
- meter rope
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The right rope in the Shaft Grounding Assembly which provides a shaft contact point at which shaft voltage readings are taken.
- oscilloscope resolution
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A measurement that describes the granularity of a waveform (like the resolution of a photograph).
- RMS
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Root Mean Square. A method of measuring the voltage or current of an AC waveform calculated by Xrms = sqrt[ (1/n) * (SUM(Xn ))], where X is the array of samples acquired and n is the number of samples acquired.
- Shaft Grounding Assembly (SGA)
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A Cutsforth product designed to provide a best-in-class ground connection, as well as a shaft contact point at which shaft voltage can be measured.
- shaft voltage
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The voltage potential between the shaft and the unit case ground as measured by the metering rope.
- shorted turns
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Shorted turns result when insulation fails between windings in a rotor winding of a generator. Shorted turns limit the load a generator can produce. Shorted turns may result in failures leading to outages.
- signal cable
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Shielded cable that carries the voltage signals from the SGA and the SCA to the monitoring system.
- unit case ground
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The lower half of the turbine case, generator case, or coupler case near the Shaft Grounding Assembly to which the shaft can be grounded.
- zero-to-peak
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A measurement of a signal calculated by |max(x)| or |min(x)|, whichever is greater, during a given period of time, where x is the array of samples acquired during that period.
The reduction of the amplitude of a signal due to excessive cable length.
American Wire Gauge
The average of the DC component measurements during a sample period as calculated by ΣX/n, where X is the array of samples acquired and n is the number of samples.
Distributed Control System
The largest and smallest value of the waveform within a given range.
The FDZC is the point at which the integral of the flux waveform is zero volts, which affords the greatest sensitivity to detecting a shorted turn in a coil.
Rate that an electric field flows through a given area, proportional to the number of electric field lines going through a virtual surface.
The amount of flux passing through a defined area that is perpendicular to the direction of the flux.
A Cutsforth product which monitors shaft voltages, shaft currents, and rotor flux signals and provides real-time data and analytics through Cutsforth's InsightCMTM software.
8 AWG, green ground conductor that carries the shaft current to the unit case ground location.
The electrical current between the shaft and the unit case ground through the ground conductor.
The left rope in the Shaft Grounding Assembly, which provides the primary path to unit case ground through the 8AWG ground conductor.
The resistance to change in the current of a circuit.
An alternating current that reaches its maximum value up to 90 degrees later than the voltage that produces it.
An alternating current that reaches its maximum value up to 90 degrees ahead of voltage that produces it.
Lockout/Tagout
The right rope in the Shaft Grounding Assembly which provides a shaft contact point at which shaft voltage readings are taken.
The magnetic fields created by the generator windings.
A sensing device which measures the rotor flux and provides a signal output.
A measurement that describes the granularity of a waveform (like the resolution of a photograph).
Root Mean Square. A method of measuring the voltage or current of an AC waveform calculated by Xrms = sqrt[ (1/n) * (SUM(Xn ))], where X is the array of samples acquired and n is the number of samples acquired.
A Cutsforth product designed to provide a best-in-class ground connection, as well as a shaft contact point at which shaft voltage can be measured.
The voltage potential between the shaft and the unit case ground as measured by the metering rope.
Shorted turns result when insulation fails between windings in a rotor winding of a generator. Shorted turns limit the load a generator can produce. Shorted turns may result in failures leading to outages.
Shielded cable that carries the voltage signals from the SGA and the SCA to the monitoring system.
The equipment monitored by the Cutsforth monitoring system.
The lower half of the turbine case, generator case, or coupler case near the Shaft Grounding Assembly to which the shaft can be grounded.
A component that reduces the voltage in a circuit by a predetermined ratio.
A measurement of a signal calculated by |max(x)| or |min(x)|, whichever is greater, during a given period of time, where x is the array of samples acquired during that period.