The PD-RD300A is the newest device in the PowerPD line of test equipment, which provides continuous monitoring of your metal clad switchgear (MCSG) assets. This device detects electromagnetic waves when surface tracking occurs on the insulation system. It determines the PD fault frequencies by scanning the 10 -100 MHz range. Data is collected in bursts (Envelop) by the count method. This trends the measurement of switchgear deterioration and will give early warning to prevent a catastrophic failure. (See images below) Breakdown occurs when your MCSG has defective insulation due to moisture, dirt, and failure of heaters and a lack of a pro-active preventive maintenance program.

System Configuration
PD-RD300A with PD-RM(MUX) MUX(16 Channels)
Fig 1
  • PD-RM (MUX Module)
      Channel: 4, 8, 16 channel
      COM: MUX control with RS-422.
      Impedance: 75Ω
  • Ant
      Frequency: 10~100 MHz
  • Power
      110~240V 50/60Hz
  • Communication; MODBUS protocol
      - RS-485:
          Baud Rate: 19200 bps
          Length: 1.2Km
          Daisy Chain: 32 units
      - Modem: (Option: Wireless modem)
          Baud Rate: 1200bps
      - RS-232
          Baud Rate: 19600 bps
          Length: 12m
  • Dry Contact
  • LED Display
  • Display
      - Operation Status
      - Normal or Alarm
      - Pulse Level(mV)
      - Number of Pulse per Second (PPS)
  • Data analysis
      - PD counts in Bursts
      - Pulse vs. Phase.
      - Amplitude vs. Phase.
      - Automatic Noise level detection.
  • Data Management
      - Up to one month of data storage (internal memory; Based on 8 channel)
      - User setting can collect data
      - Phase vs. Time, Pulse vs. Phase, Pulse vs. amplitude
      - Display and management of daily, monthly and Yearly data
      - 2D/3D graph display.
  • System Operations
      - Windows NT/2000/XP Environment

The composition of PD-RD300A, as in Fig 2, along with a PD-RM (MUX module) can cover up to 16 MCSG in order to reduce the prime cost of system. The frequency ranges are 10 - 100MHz for measurement to find the highest PD signal.

PD Counts in Bursts

The high magnitude frequency range for corona and surface PD is between 14 and 80MHz. The PD-RD300A scans between 10 and 100 MHz, then spotlights and zeros in on the fault frequency. This device then measures, counts and displays the PD Envelop.

Applicable Targets: MCSG, dry type transformer, underground cable and CGIS.

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