Iris Power Stator Slot Couplers (SSC)

Partial Discharge Sensor For Hydrogen Cooled Machines

Sensors installed within the stator slots to detect partial discharge activity

Hydro Generator
Turbine Generator
Works with These Assets


  • Permanently installed under the line end stator winding wedges (in existing machines), or between the top and bottom bars (in new or rewound machines)
  • Not connected to the high voltage winding, and they are not subject to any high electrical stresses
  • Made from epoxy glass laminate, NEMA FR4 (Class F)
  • 10-1000 MHz bandwidth (3 dB cut-off)
  • 50 Ω impedance
  • Dual output to distinguish slot from endwinding partial discharges
  • 2.0 mm thick, width cut to fit stator slot, length trimmable to 53 cm


  • NEMA FR5 (Class H) available on request
  • Hydrogen penetration kits for 6, 9 or 12 SSCs – comprehensive penetration kit requires only 1 hole in generator casing, includes termination box assembly (default) or termination box and extension cables, and nitrogen gas pressure tested to 2750 kPa or 400 psi
  • 50/60 Hz voltage reference signal required (use one of the following): – Isolation Transformer in enclosure, for connection to potential transformer or EMC