RHM International, LLC

Innovative High Reliability High Voltage Equipment for the Power Grid

Menu
  • Home
  • Products
    • RHM International current transformer typesCurrent Transformers
      • LRGBJ Series – up to 550kV
      • LRGBJ-ZH Cascade Series – above 220kV
      • LRGBJ – ZHD Series for High Currents
      • GDGL Optical/Electronic Series
      • Shunt Capacitor Bank Applications
    • Dry Insulation high voltage transformer bushings by RHM InternationalTransformer Bushings
      • RIF® – FGRBW Tough Series
      • Cascade RIF® for EHV Applications
      • Built-In Insulation Monitoring
    • RHM International high voltage wall bushingsWall Bushings – Special Bushings
      • STB Wall Bushings Specifications
      • STB-L Series: Wall Bushing with CT
      • Special Bushings — Custom Designs
    • cable termination by RHM InternationalHV DRY TYPE OUTDOOR CABLE TERMINATOR
      • Cable Terminator
    • Electronic Combined Voltage and Current Transformer REVCT35-1000 Series 35 kV – 1000 kV by RHM InternationalIEC 61850 Ready and NCITs
      • BIIT™ HV MEASUREMENT BUSHING
      • Optical/Electronic Current Transformer
      • Electronic Combined VT and CT
      • Smart Monitoring
    • Close
  • Why Us
    • Company Advantages
      • Shorter Lead Time
      • Custom Designs
      • Testing Capabilities
      • Quality & Supply Chain
      • ISO 9001
    • Product Benefits
      • Outstanding Performance
      • No Maintenance
      • No Explosions
      • Easy Storage
      • Environmentally Friendly
      • Longer Life & Higher ROI
      • Sustained Higher Performance
      • Proven Track Record
    • Expertise & Assistance
    • Close
  • Technology
    • 1Our Technologies
      • HV DryShield® for CT’s & Wall Bushings
      • RIF® Insulation for Transformer Bushings & Cable Terminators
    • smart-monitoringSmart Monitoring
      • Built-in Condition Monitoring
      • Bushing based Transformer PD Monitoring
    • The-Dry-Type-RIF-Bushing_The-New-Technology-in-HV-Bushings-1Publications
      • HV DryShield® – A dry type HV insulation system for extreme environments
      • RIF ® bushings The paperless, dry-type bushing technology
      • The Dry Type RIF ® Bushing: New Technology in HV Bushings
      • Advances in Bushings Technology – Integrated Monitoring Systems
    • 3Product Specification Sheets
      • Current Transformers
      • Wall Bushings
      • IEEE Bushings
      • IEC Bushings
      • Cable Terminals
    • Installation & Testing
    • Close
  • Your Specs
  • HV Testing Services
  • About Us
  • Blog
  • Opportunities
  • Contact Us

Bushing based Transformer PD Monitoring

Partial discharge monitoring is an important way of assessing the condition of the transformer insulation. In the past detecting and analyzing partial discharge in the field has involved costly test set-ups that are prone to noise making these field measurements less sensitive or accurate.

RHM International has developed a bushing based approach for detecting partial discharge in an operating transformer. The RHM International system simultaneously monitors the transformer PD condition and bushing insulation condition by using smart RIF® bushings to couple the transformer’s discharge pulse current signals and the bushing’s last layer ground current signals through the bushing’s built-in Cs capacitance. A signal cable transmits the signals from each smart RIF® bushing to a PD monitoring device for sampling and processing. The more smart RIF® bushings installed on the transformer the more accurate the partial discharge location analysis.

Advantages of the RHM International Built-In Transformer Partial Discharge Monitoring

  • Simplicity. No accessories or external sensors are installed.
  • Reliability. It doesn’t use the bushing ground layer wire (discharge pulse current signals & bushing ground layer current signals are obtained through Cs).
  • Full monitoring picture. It monitors the entire transformer insulation condition.
  • High SNR. Uses direct coupling to collect PD signals so it increases the coupling signal strength and improves the SNR.
  • Good anti-interference capability. The smart RIF® bushing measurement terminal uses a metal enclosure connected with the flange to form a closed shielding space.
  • Safety. Has no impact on the safe operation of the transformer (a very low voltage is seen by Cs).

Products

©2020 RHM International, LLC. All Rights Reserved. Developed by BBDS Design