Air-Gap Flux Probes
A flux probe test determines the existence of rotor winding shorted turns by measuring the magnetic flux produced by each coil in a generator's rotor. The probe is installed in the air-gap wedge of a generator stator and when coupled with Generatortech’s data acquisition & analysis system measures flux-density changes in the stator air-gap and used to diagnose potential shorted turn conditions.
Permanent Air-Gap Flux Probes
Permanent Air-Gap Flux Probes are custom designed and fabricated for each application.
Correct flux probe dimensional and sensitivity parameters are essential for obtaining signals that can be used for analysis. A variety of available models and construction materials are used to design and build the optimum flux probe for each generator.
Generatortech flux probe materials are impervious to the normally harsh environment within the generator and are expected to last for the life of the stator.
Temporary Air-Gap Flux Probes
Temporary Air-Gap Flux Probes are available for hydrogen and air-cooled machines.
While permanent probes must be installed while the rotor is removed from the stator core, there may be cases where critical shorted-turn conditions are experienced before a planned outage.
On many generators, it is possible to utilize a temporary flux probe. Temporary probes are inserted through a stator ventilation slot into the air-gap. For hydrogen-cooled generators, a ball valve assembly must be installed during an outage when the unit is degassed.
The data from a temp probe will provide the same definitive test results, thus allowing you to determine whether corrective action should be performed at the next outage.
Generatortech can help you evaluate the feasibility of installing the temporary test set-up.