DMS PDMG-RH Online Partial Discharge Monitoring System for GIS

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  • Automatic PD fault classification
  • High resolution
  • Selectable UHF filters and gain on a per coupler basis
  • Enhanced noise gating features for elimination of interference
  • Enhances system reliability and reduces risks
  • Detects faults in real-time before failure, damage or loss of supply
  • Increases safety for personnel
  • Determines condition of GIS insulation
  • Implementation of efficient, condition-based maintenance strategies
  • Extends residual life of aging plant and defers capital costs
  • Reduces insurance premiums
  • Retrofits to most major GIS systems


The PDMG-RH system is used for continuous, online partial discharge monitoring and analysis on permanently installed applications on all makes of GIS in transmission installations and on critical systems such as in power plants and large industrial consumers. It provides digital and analog (SCADA) outputs for remote alarm and warning as well as remote data access to all diagnostic information.



Equipment cabinet Input                                  300 channels max
Local interface                 Central control computer w/ 17” monitor
Remote interface              GPS/ backup system
Output Two SCADA/SCS Alarm contacts (PD alarm, system fault)
Ethernet or modem communications
LED status indicators
Optical convertor unit (OCU) Power supply                    110-240V 50/60 Hz
Supply current                  110 mA
Input                                  3 UHF channels
Ambient operating            -25 to +55°C (-13 to +131°F) (BS EN 60068-2-1,60068-2-21)


Humidity                            100% condensing
UHF sensors Mounting                           Internal or external
Output                               Communicates to OCU or equipment cabinet
Bandwidth according to  500-1500 MHz NGC/TGN(T) 121
Smart HQ software Operating system             Windows XP compatible
Max monitoring locations    256 sites
Memory                             512 MB
Min size for installation    5 MB (excludes database)
System alarms                  System fault, channel fault
PD alarms                          Gradient, PD trend
PD trend indicators          Criticality rate of change
Bi-weekly system             Email, SMS (text message) status notification
Compliance      EMC compliance                  Tested to Industrial Generic Immunity and Industrial

Emission standards