W-PD2 Bushing Monitoring System

      W-PD2 is a stand-alone microprocessor-controlled monitoring devicespecially designed to monitor the Gamma value in 60/50 Hz sets of bushings (25Hz is also applicable), to store the information in its internal memory and toprovide an alarm signal based on Gamma-parameter characteristics at an earlystage of insulation degradation.

      • Calculations of capacitance and relative Tanδ of each bushing in a three-bushing set.
      • Determining temperature coefficients of Tanδ of each bushing.
      • W-PD2 has a temperature input for hot oil temperature allowing revealbushing characteristics temperature         dependencies.

      • W-PD2 has several interfaces that allow for easy implementation intoan alarm or SCADA system
      • One form-C dry relay contact providing “Red” alarm and device malfunctionindication.
      • 4-20 mA optically isolated (or 0-5 V non-isolated) output represents parameter Gamma to SCADA system

      • Optically isolated RS-485 (optional RS-232) interface allowing for device configuration and data download into
        PC. RS-485 interface based on ModBusRTU protocol allows for networking with an existing ModBus network.
      • PD ports provide for measurement of partial discharges on periodical basis withany appropriate external PD         instrumentation.