Online GIS PD monitoring system according to IEC61850 protocol

• UHF Method: Detects PD pulses via high-frequency electromagnetic waves generated by PD activity within GIS.
• Ultrasonic Method: Identifies ultrasonic waves produced by bubble shocks caused by PD.

Key Monitoring Data

• UHF PD signals
• Ultrasonic PD signals
• Transformer voltage signals

• Sensors: Capture PD-related signals.
  • UHF PD sensors detect electromagnetic signals.
  • Ultrasonic sensors measure acoustic signals.
• Data Preprocessing System: Conditions and prepares signals for analysis.
• PD Monitoring IED (Intelligent Electronic Device): Processes, stores, and displays data at the bay level.

Signal Flow and Communication

• Process Level: UHF and ultrasonic sensors acquire electrical and acoustic signals, which are conditioned and transmitted to the PD monitoring IED.
• Bay Level: The IED stores, displays, and processes data. Specific communication service mapping (per IEC 61850) defines network transmission standards for sampled values between the process and bay levels.
• Station Level: Data is reported from the bay level to the station level via predefined communication services for centralized monitoring.

System Structure