Partial Discharge Monitoring


Utilizing advanced UHF technology, the PDMG-RH system, a member of the highly successful PDMG-R family, is designed for GIS installations. It collects PD data from UHF sensors (couplers) installed on the GIS and transmits the information to software for automatic interpretation and analysis by Expert Software, allowing incipient faults to be avoided and the condition of the long term health of the insulation system to be simply and effectively monitored over the life of the GIS.


A self sufficient and portable PDM system for rapid monitoring and analysis of partial discharge in
gas insulated switchgear (GIS) and power transformers. The system is field operated, touch screen based and gives engineers the tools required for diagnosing partial discharge with limited or no access to the main PDM infrastructure.

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Equipment Cabinet
Input 2000 channels max
Local MMI Interface Central control computer 19” monitor
Additional MMI Interface GPC/backup system


Three SCADA/SCS alarm contacts and five auxiliary:
- PD warning
- PD alarm
- System fault
Ethernet, IEC 61850 or modem communications
8 x LED status indicators
Extensive automatic self test with logging
Power Supply 110 V 50/60 Hz
Supply Current 200mA
Input 7 UHF channels
(2 x 3 UHF coupler inputs + 1 external antenna)
UHF Bandwidth 100 – 2000 MHz
Gating Antenna

100 – 3000 MHz

Dynamic Range -75 to -30 dBm (logarithmic)
Ambient Operation Temperature -25 to +55°C (-13 to +131°F)
(BS EN 60068-2-1, 60068-2-21)

100% condensing


Interference Filtering
Methods Per channel:
Software selectable gating, coincidence, bandpass filtering or software filtering
UHF Sensors
Compatible Internal or external
SMARTPDM and SMART HQ software
Operating System Windows 7
Max Monitoring Locations 256 sites
System Alarms System fault
PD Warning/Alarm Event or PD trend
Alarm Status Notification IEC 61850
SMS (text message)
HTML based WEB pages Alarm
System Status
Data summary
GIS HV testing
Compatible Ability to monitor and record PD during testing

EMC compliance

Tested to Industrial Generic Immunity and Industrial Emission standards at enhanced levels.


Power Supply
Voltage Range 90 to 264 VAC, 47-63 Hz;
40 to 290 VDC universal supply
Supply Current 110 mA @ 230 VAC
Power 70 W
MCU (Master Control Unit)
Input 3 UHF channels / (or) 6 UHF channels
1 additional channel for noise antenna
Outputs Alarm indications on the screen:
- PD fault alarm
- PD alarm
- PD warning alarm
- System status indicator
MMI LCD display with full touch interface
UHF Sensors (Optional)
Mounting Internal or external

Communicates to portable

Bandwidth Wideband 300 - 1500 MHz
Sensitivity > 6 mm, < 5pC
Remote SMARTSUB Software
Operating system Windows XP / Windows 7 compatible
Max monitoring locations



1GB, upgradable (if required)

Min. size for installation

20 MB

System Alarms

System fault, channel fault

PD alarms / PD warning

Gradient, PD Trend


Sample rate

15.4 KS/s per channel
Total of 107.5 KS/s for 7 channels (simultaneous sampling)

Data storage

16 GB


1.2 GHz

Time synchronization


Noise gating coincidence filters



Ethernet ports - external RJ45 (10/100 Mbps)
USB One port to facilitate firmware upgrade, configuration upgrade and manual download of data
GPRS Optional
Ambient operating temperature -25ºC to +55ºC
Storage temperature -25ºC to +75ºC
Humidity 5 - 95% non-condensing
Enclosure Rating NEMA IP66
Siesmic IEEE C37.98 (Seismic Testing of Relays)
Environmental test compliance BS EN60068-2-2, BS EN60068-2-1, BS EN60068-2-78
Vibration test compliance BS EN68-2-6, BS EN68-2-27, BS EN68-2-29
EMC test compliance Confirms to relevant specifications for monitoring / control equipment in HV substations.
BS EN55022 (:2006); BS EN61000-3-2 to -3-3, BS-EN61000-4-2 to -4-6,
BS EN61000-4-8, BS EN61000-4-11, BS EN61000-4-18; IEC 60255-5,
IEC 61180-1
Others EMI / RFI immunity
Dimensions and weight

508 mm x 355 mm x 254 mm [20” x 14” x 10”]
17 kg [37.5 lbs]


12” touch screen, (1024 x 768). Rotary / push button