DFA500

RFI & Acoustic Signal Analyzer

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IN-SERVICE TESTING & ASSESSMENT
DFA500

The Doble DFA500 is a radio frequency interference and acoustic signal analyzer used to discover early signs of insulation problems in GIS, SF6-filled dead-tank breakers and instrument transformers.

Used during commissioning or while the equipment is in service, the DFA500 can detect flaws such as bouncing particles, protrusions, floating potentials as well as mechanical vibrations.

The DFA500 is an ideal instrument for GIS commissioning tests and condition based maintenance programs.

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    • Five different modes for analysis: oscilloscope, bar graph, phase resolved, time of flight and location
    • Simultaneous reading of UHF and acoustic signatures in all modes
    • Quick and easy to configure, this portable device produces results in seconds
    • Battery-operated device runs for up to 6 hours on one charge
    • Wireless synchronization module for timing partial discharge and mechanical activity against the power system frequency
    • View instant readouts on large LCD screen and easily navigate through measuring modes and settings
    • Review, make reports and upload results with the PDViewer software

    • Find and monitor internal flaws in gas insulated switchgear and act before they turn into catastrophic failures
    • Identify and locate partial discharge, particles and mechanical defects such as loose parts and vibrations
    • Determine failure type based on acoustic characteristics
    • Distinguish between particles, protrusions, floating potentials and insulator support problems
    • Cost-effective alternative to GIS monitoring systems

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    Sensors

    R15i AST Sensor

    R15i AST Acoustic Sensor

    • Sensor with integrated pre-amplifier for oil-filled apparatus, i.e. transformers and instrument transformers
    • Includes cable and magnetic hold down
    • Resonance 150kHz
    • Range 5 kHz – 500 kHz
    TEVProbe TN80310

    TEV Sensor

    • For use in GIS
    • Connect the TEV probe directly on the antenna input of the DFA500
    • Move the sensor across a grounded metal surface to find the location of the strongest signal amplitude
     HFCT TN80308

    HFCT Sensor

    • Clip on an apparatus ground wire and connect to the DFA300 to confirm internal PD activity
    • Scan for electrical pulses (f<200 MHz) as evidence for partial discharge to earth
    UHF DV sensor_DN5080 TN80322

    UHF Drain Valve Sensor DN50/DN80

    • For use with HV Transformers for decoupling of electromagnetic PD signals from inside of transformers
    • Sensor fits into DN 50 or DN 80 drain valves
    • Supports “Performance/Sensitivity Check” where high frequency test pulses can be injected with further integrated electrodes
    • Grounded sensors (for low frequencies)

IN-SERVICE TESTING & ASSESSMENT

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