Partial Discharge Monitoring System

Application: Online partial discharge measurements detect failures in the stator winding insulation in operation. Online partial discharge measurements can be taken either periodically with a portable partial discharge analyzer or continuously with a permanently installed monitoring system. Partial discharge monitoring is applicable on large hydro-generators or on turbo-generators.

• Delamination of single conductor to main insulation
• Delamination of the main insulation
• Abrasion of the corona slot protection

Typical Installation: Partial discharge couplers installed on each generator/ motor phase exit.

Application: Shaft and bearing vibration monitors the vibration amplitude to detect wear of bearings, shaft imbalance and misalignment. The shaft and bearing vibration monitoring is specified in the ISO-7919 and ISO-10816 norms respectively. Plain bearings deterioration and failures can be detected using condition monitoring tools such as shaft center path (orbits) and shaft centerline. Shaft and bearing vibration are applicable on any rotating machines such as hydro turbines, gas turbines, steam turbines, pumps, fans, cooling fan towers.

• Mechanical unbalance
• Misalignment
• Damages or wear of plainbearings
• Misc. tribological issues on plain bearings

Typical installation: 2 proximity probes or absolute vibration sensors installed at 90° apart located in the radial direction.