Problems With Stator Core Laminations

Good quality of insulation between stator iron laminations is one of the major preconditions for proper operation and top performance of generating units. Local hot spots and overheating as a result of insufficient insulation between stator iron laminations will  cause premature aging of high voltage insulation on stator bars. Also, it will damage the stator iron core and cause the loss of power in generators. 


   Generator slot and lamination assessment

bulletDetecting hot spots in magnetic core
bulletFinding lamination defects
bulletLow value of magnetic flux used to detect the problem
bulletDetect loose wedges in the stator slots


SWP - Stator Wedge Probe
SWP - Stator Wedge Probe is a precise tool used to detect loose wedges in Generator or Motor stator slots. SWP instrument consists of Universal Stator Slot Scanning Head holding electronically controlled - Linear Variable Differential Transformer (LVDT) with signal conditioning. SWP detects movements with micronic precision and imports them into the graphic SWP software or simply show them on the SWP - Central Processor Unit (CPU) digital display.
SWP-7 Easy to read display gives movements directly in millimeters
SWP software sort wedges in 7 different categories of looseness
SWP-7D with universal Stator Slot Scanning Head and CPU
SWP software categorizes wedges into 7 (SWP-7) or 30 (SWP-30) different categories.
SWP-7 unit is excellent for testing stator slot wedges in generators.
SWP-30 unit is convenient for motor stator wedges and precise laboratory movement tests.
Our Dual (D) SWP-7D series instruments are designed to have option of holding SWP (Stator Wedge probe) or CDA (Core Defect Analyzer) type tools in the Universal Stator Slot Scanning Head and condition one signal or another. This has been the best choice for power utilities to have option to scan their stator slots and obtain information on wedge looseness and / or stator iron damage using the same tool with different attachments.
SWP-7 / SWP-7D and SWP-30 LVDT sensors
DC LVDT's incorporate a small encapsulated carrier generator/signal conditioning module.
High permeability, nickel-iron hydrogen-annealed core for low harmonics, low null voltage, and high sensitivity.
SWP-7D signal conditioner and readout display
SWP-7/SWP7D and SWP-30 LVDT sensors
guarantee detection of minimal wedge movement



Levico,  Incorporated 1995        Back         Home