Qualitrol QPDM Transformer Partial Discharge Monitor
Qualitrol QPDM Transformer Partial Discharge Monitor
The Qualitrol QPDM is a highly accurate partial discharge monitor, utilising Ultra High Frequency (UHF) technology. Monitoring real-time, this partial discharge monitor predicts faults so that corrective actions can be taken before failures occur.
The QPDM represents the next generation of Qualitrol’s field-proven, industry leading UHF Partial Discharge monitoring, trending and classification technology based on 25+ years of customer experience.
Preventing Transformer Failures with PD Monitoring
More often than not, a transformer failure is an economic disaster. Most of the time, the economic impact comes from the wait time for a replacement. Did you know that the typical time between order, manufacturing, delivery, and replacement of a transformer can easily take longer than a year? By not actively monitoring your transformer you could lose revenue, experience catastrophic failures and have major safety and environmental impacts.
Partial Discharge (PD) monitoring, trending and localisation have proven to be reliable methods for detecting defects in the insulation system of transformers before major damage or a breakdown occurs.
An Introduction to the Qualitrol QPDM
The QPDM is a one box solution for continuous online monitoring of PD activity in a transformer's tank.
The QPDM system is based on industry proven Ultra High Frequency (UHF) technology. It monitors PD activity on real time basis and detects faults so that corrective actions can be taken before any failure occurs. This next generation system with higher sensitivity and wider dynamic range provides accurate, reliable and reproducible measurements even under the most difficult environmental conditions. The information gained from the QPDM is used for condition based maintenance decisions to optimise maintenance expenditures and extend life of the asset.
UHF PD Sensors
Qualitrol’s UHF sensors are the key components of any PDM system. They detect the UHF signals induced from PD pulses and transfer the signal to the data acquisition system for interpretation. The QPDM can be connected with any available UHF sensor; internal, window or drain valve. The system can be scaled from 1 to 6 sensors.
Custom Sensors
We can custom-design all types of UHF sensors through Qualitrol for particular applications.
Qualitrol can calibrate all custom designed sensors to ensure they meet any customer specifications for sensitivity and bandwidth.
Internal PD Sensors
In new transformers the partial discharge sensors are usually fitted internally, inside the tank wall.
Internal sensors act as antennas picking up UHF signals emitted from PD. Complete protection for sensitive electronics of the QPDM is assured by fitting an external protector which suppresses dangerous voltages or transients,
Window PD Sensors
For retrofitted systems, external partial discharge sensors can be fixed in transformer tap changers or available hand or manhole covers.
Replacement hatch covers are prepared before the installation Sensors are fitted on top of tank to the replacement hand or manhole covers. O il is only drained to a few cm below the hatch level and outage times are kept to a minimum.
Drain Valve PD Sensors
For retrofitted systems, external partial discharge sensors can be also be inserted in the transformer drain valves.
Qualitrol’s drain valve sensor can be easily and rapidly retrofitted to the existing transformer oil drain / filter valve.
Download Qualitrol QPDM Brochure
Partial Discharge Transformer Monitor
Qualitrol QPDM Features
Accurate and early incipient fault detection ensures reliable operation and reduces supply outages
Outstanding built-in sensitivity of -80 dBm and wide band selections, covering 300 to 2100 MHz
High dynamic range of 70 dB enables better analysis of PD activity with larger amplitude variations
Robust design and excellent interference immunity for measurements under difficult environmental conditions
Advanced HMI provisions (intelligent data handling, display and interpretation)
Qualitrol Expert PD analysis services
Flexible installation and configuration options to meet customer expectations
Smart and quick real time alarming / alerting mechanism
Remote monitoring and configuration
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